diff --git a/.gitignore b/.gitignore
index f41edda..2236821 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,4 +17,6 @@ node_modules/
 # Local databases (SQLite projection + Hydrant fjall store).
 /data/
 /hydrant.db/
-rustc-ice-*.txt
\ No newline at end of file
+rustc-ice-*.txt
+# Impeccable design detector scratch (ignore lists, design sidecar, critique snapshots).
+.impeccable/
diff --git a/.polytoken/skills/frontend-design/SKILL.md b/.polytoken/skills/frontend-design/SKILL.md
new file mode 100644
index 0000000..f7cfe57
--- /dev/null
+++ b/.polytoken/skills/frontend-design/SKILL.md
@@ -0,0 +1,162 @@
+---
+description: Use when designing, building, reviewing, critiquing, or polishing any Polymodel front-end surface (Dioxus RSX components, routes, CSS, layout, color, type, motion, states, copy). Carries the adapted Impeccable design method for Polymodel's blueprint identity and product register.
+polytoken:
+  tags: [frontend, design, ui]
+---
+# Polymodel front-end design
+
+Use this whenever you touch a Polymodel UI surface: a Dioxus component, a route, `assets/styling/*.css`, or any decision about layout, color, type, motion, state, or UX copy. It exists so front-end work ships with intentional craft instead of generic AI-generated defaults.
+
+Announce: "using the frontend-design skill for Polymodel UI work".
+
+**Source and companions.** This skill adapts [Impeccable](https://github.com/pbakaus/impeccable) (Paul Bakaus, Apache-2.0), which builds on Anthropic's `frontend-design` skill — distilled to Polymodel's stack and identity rather than vendored wholesale. Companions:
+
+- **`DESIGN.md`** (repo root) — the blueprint design system as machine-readable tokens (Stitch format) mirroring `assets/styling/theme.css`. Source of truth for the deterministic detector's design-system checks. Keep it in sync with `theme.css`.
+- **`tools/design-detector/`** — the vendored deterministic linter (see Detector below).
+- **Confluence**, space `PM`, [*Front-end design guidance*](https://radiant-industries.atlassian.net/wiki/spaces/PM/pages/655362) (child of the Polymodel Overall Design Plan) — the durable human-facing version of this method, with credit and links.
+
+Read `DESIGN.md` and the relevant `assets/styling/*.css` before non-trivial UI work.
+
+---
+
+## 1. Setup: orient before you design
+
+1. **Read the tokens and the existing vocabulary.** `theme.css` (color, fonts, spacing, radius, dark mode), then `base.css` and `cards.css` (cards, buttons, inputs, tabs, status pills, skeletons, the drafting-grid media). Reuse what exists; do not invent a parallel system. `DESIGN.md` documents these as a system with named rules.
+2. **Know the register.** Polymodel is **product UI** — a tool people browse and publish with — not a marketing/brand surface. Design *serves* the task.
+3. **Preserve the blueprint identity** (§3). It is committed and distinctive. Do not "fix" it toward generic flat-SaaS or dark-terminal defaults.
+
+---
+
+## 2. The register: product, not brand
+
+Every design task is either **brand** (marketing/landing/portfolio — design *is* the product) or **product** (app UI, tools, dashboards — design *serves* the product). Polymodel is product.
+
+The product test is not "would someone say AI made this" — familiarity is a feature here. The test is: **would a user fluent in the category's best tools (Printables, Linear, Figma, Stripe) sit down and trust this, or pause at every subtly-off component?** Product UI's failure mode isn't flatness, it's *strangeness without purpose*: over-decorated buttons, mismatched controls, gratuitous motion, display fonts where labels belong, invented affordances for standard tasks. The bar is **earned familiarity**; the tool should disappear into the task.
+
+Product can afford things brand can't: familiar sans defaults, standard nav patterns, density when users need it, consistency over surprise. Save delight for moments, not pages.
+
+---
+
+## 3. The blueprint identity (committed — preserve it)
+
+Polymodel's north star is **"The Drafting Table"**: a well-kept set of engineering blueprints rendered for the web. These are intentional choices, not slop to clean up.
+
+- **Paper base, not "AI cream."** `--color-base` (`#f5f1e8` light) is a drafting-paper tone tinted toward the brand — the blueprint substrate. This is a *committed* identity choice; identity-preservation beats the generic "never warm-neutral body bg" rule. Never rename it `--paper`/`--cream`/`--sand`; never swap it for a flat off-white.
+- **Teal primary, one warm-orange action.** `--color-primary` teal carries structure (active/selected/focus, grid lines). `--color-action` orange is the single warm accent, reserved for the *one* primary action per view. Accent marks action and state, never decoration.
+- **Near-square corners.** `--radius-panel: 2px`; controls render at 0px (`base.css`). Never round cards/inputs to 12px+; full pill only for tags. Over-rounding breaks the drafting feel.
+- **Drafting-grid media.** Empty/preview surfaces use the grid background (`--color-grid-line`), and missing media draws nested registration rectangles — never a flat gray box, never fake content.
+- **Mono for metadata.** `--font-mono` (Ioskeley Mono) carries dimensions, formats, DIDs/handles, counts, status pills. `--font-ui`/`--font-heading` (Proza Libre) carries everything else — one humanist sans for body, headings, labels, buttons.
+- **Both schemes first-class.** Every token has a dark variant; verify light *and* dark.
+
+---
+
+## 4. General rules
+
+### Color
+- **Verify contrast.** Body ≥ 4.5:1; large/bold-large (≥18px / bold ≥14px) ≥ 3:1; placeholders ≥ 4.5:1 (not muted-gray). The single most common AI failure is muted gray body text on a tinted near-white — exactly our paper base. When a value is even close, move toward `--color-text`/`--color-emphasis`, not `--color-muted`.
+- **No gray on color.** Gray text on a colored background looks washed out — use a darker shade of that hue, or a transparency of the text color.
+- **Restrained palette.** Tinted neutrals + the action accent. Heavy/full-saturation color does not belong on inactive states. A single surface may earn a committed color, but restrained is the product floor.
+- **State vocabulary, standardized:** hover, focus, active, disabled, selected, loading, error, warning, success, info. Accent is for primary action / current selection / state indicators only.
+
+### Typography
+- **One UI family.** Proza Libre for headings, labels, body, buttons. No display/body pairing. Mono only for the metadata roles in §3. Never a display font in labels, buttons, or data.
+- **Fixed rem scale, not fluid `clamp()` headings.** Product UI is viewed at consistent DPI; a heading that shrinks in a panel looks worse. Tight step ratio (~1.125–1.2). The card-title `clamp()` is the one sanctioned exception.
+- **Prose line length 65–75ch.** Dense data/tables may run wider.
+- **`text-wrap: balance`** on headings; `pretty` on long prose.
+
+### Layout
+- **Flexbox for 1D, Grid for 2D.** Don't reach for Grid where `flex-wrap` is simpler. Responsive card grids without breakpoints: `repeat(auto-fit, minmax(280px, 1fr))`. **Repo trap (AGENTS.md):** a Grid container + `min-height: 100vh` stretches rows and opens large gaps — use a flex column for vertical page shells.
+- **Cards are the lazy answer; nested cards are always wrong.** Use a card only when it's genuinely the best affordance. Thing cards are legitimate; a card wrapping cards is not.
+- **Vary spacing for rhythm.** Build a semantic z-index scale (dropdown → sticky → modal → toast → tooltip); never `999`/`9999`.
+- **Responsive behavior is structural** (collapse nav, responsive tables, breakpoint columns), not fluid typography.
+
+### Motion
+- **Conveys state, not decoration.** 150–250 ms, ease-out (quart/quint/expo) — no bounce, no elastic. Reserve it for state change, feedback, loading, upload progress, publish-state, viewer readiness. No orchestrated page-load sequences; users load into a task.
+- **`prefers-reduced-motion` is not optional** — every animation needs a reduce fallback (crossfade or instant).
+- **Don't animate layout properties** or `<img>` on hover; animate background/border/shadow instead.
+
+### Components & states
+- **Every interactive component ships all states:** default, hover, focus, active, disabled, loading, error. Don't ship half. Focus must be visible (the input `:focus` outline in `cards.css`).
+- **Skeletons, not center spinners,** for content loading (`.skeleton-*` exist).
+- **Empty states teach** the interface ("publish your first thing" + CTA), never "nothing here."
+- **Consistent affordances** across browse/search/profile/thing/publish: same button shape, same control vocabulary, same icon style. If "save" looks different in two places, one is wrong.
+
+### Interaction
+- Dropdowns with `position: absolute` inside `overflow: hidden/auto` get clipped — use `position: fixed`, the popover/`<dialog>` API, or a portal.
+- Exhaust inline/progressive alternatives before a modal; modal-as-first-thought is usually laziness.
+
+---
+
+## 5. Anti-pattern catalog (rewrite if you catch yourself writing these)
+
+Cross-register slop tells:
+
+- **Side-stripe borders** — `border-left/right` >1px as a colored accent. Use full borders or background tints.
+- **Gradient text** (`background-clip: text` + gradient). Solid color; emphasis via weight/size.
+- **Glassmorphism as default** decoration.
+- **The hero-metric template** (big number + label + gradient) and **identical icon-card grids**.
+- **An uppercase tracked eyebrow above every section**, or numbered `01/02/03` markers as default scaffolding. (`.eyebrow`/`.product-kicker` are for *deliberate, occasional* use — the ban is reflexive repetition.)
+- **Text that overflows its container** at any breakpoint — test thing names/titles at mobile/tablet.
+- **Ghost-card**: a 1px border + a wide (≥16px) soft shadow on the same element. Pick one.
+- **Over-rounding** (24px+ on cards), **sketchy/hand-drawn SVG**, **repeating-stripe backgrounds**.
+
+Product-specific bans:
+
+- **Decorative motion** that doesn't convey state.
+- **Inconsistent component vocabulary** across screens.
+- **Display fonts in UI** labels/buttons/data.
+- **Reinvented standard affordances** for flavor (custom scrollbars beyond our thin styling, weird form controls, non-standard modals).
+- **Heavy/full-saturation accents on inactive states.**
+
+### The slop test (two altitudes)
+1. **First-order:** could someone guess the theme + palette from the category alone ("atproto 3D-model site")? If yes, it's the training-data reflex.
+2. **Second-order:** could they guess it from category-plus-anti-reference ("not flat-SaaS → must be dark-terminal")? If yes, it's the trap one tier deeper.
+
+Polymodel's answer to both is the **blueprint identity** — lean into it deliberately rather than landing on flat-SaaS or dark-terminal.
+
+---
+
+## 6. Evaluation method (review / critique / audit)
+
+When reviewing a surface rather than building one, run two passes and synthesize.
+
+### Design critique (judgment)
+Score Nielsen's 10 heuristics 0–4 (be honest — most real UIs land 20–32/40): system-status visibility, match to real world, user control/freedom, consistency, error prevention, recognition-over-recall, flexibility/efficiency, aesthetic/minimalist, error recovery, help. Then:
+- **Cognitive load:** ≤4 items per decision point (Miller/Cowan); chunk, group by proximity, progressive disclosure; one primary action + 1–2 secondary, rest in a menu. Flag any decision point with >4 visible options.
+- **Personas:** walk the primary action as 2–3 relevant archetypes (e.g. the impatient power user who wants keyboard/bulk paths; the first-timer who needs visible labels and plain-language errors). Report what *broke* for each, specifically.
+- **AI-slop verdict** against §5.
+
+Tag each issue P0 (blocks task) / P1 (major, fix before release) / P2 (minor) / P3 (polish). Be specific ("the publish button," not "some elements") and say why it matters to users.
+
+### Technical audit (measurable)
+Score 0–4 across: **accessibility** (contrast, ARIA, keyboard nav/focus, semantic HTML, alt text, labeled inputs), **performance** (layout thrash, expensive/unbounded animations, missing lazy-load/memoization), **theming** (hard-coded colors vs tokens, dark-mode parity), **responsive** (fixed widths, ≥44px touch targets, no horizontal overflow), **anti-patterns** (§5). Run the detector (§7) as the deterministic half of this pass.
+
+---
+
+## 7. The detector
+
+`tools/design-detector/` is the vendored deterministic linter (44 rules; Apache-2.0; see its README):
+
+```sh
+node tools/design-detector/detect.mjs --json assets/styling/        # static CSS scan (plain Node)
+node tools/design-detector/detect.mjs --json http://localhost:8080  # rendered route (real browser; `just serve` running)
+```
+
+Exit `0` clean / `2` findings. It scans **CSS and rendered HTML, not `.rs` RSX** — so it covers `theme.css`/`*.css` and live routes; rely on the §8 checklist for RSX-level structure. `design-system-*` findings (radius/color outside scale) read repo-root `DESIGN.md`, so keep that synced with `theme.css`. Scratch lands in `.impeccable/` (gitignored). Treat `advisory` findings as judgment calls; fix `warning` findings or justify them.
+
+---
+
+## 8. Workflow & checklist
+
+Before review or handoff: run `just fix` and the narrowest relevant tests (`just test` / e2e; `just test-all` for substantial UI changes). Verify in-browser with Playwright MCP — screenshots **plus** accessibility snapshots with boxes and computed-style inspection (screenshots show symptoms; boxes/computed styles find the offending rule). Check **both schemes** and **mobile + desktop**. Don't commit `.playwright-mcp/` scratch.
+
+- [ ] Reused existing tokens/components; no parallel system invented.
+- [ ] Blueprint identity preserved (paper base, near-square corners, teal/one-orange-action, mono metadata, grid-line media).
+- [ ] Body/placeholder contrast ≥ 4.5:1 in both schemes; no gray-on-tint mud.
+- [ ] All interactive states present (default/hover/focus/active/disabled/loading/error); focus visible.
+- [ ] Skeleton loading + teaching empty state + actionable error state.
+- [ ] One UI family + mono for metadata only; no display fonts in UI; fixed rem heading scale.
+- [ ] No §5 anti-patterns; motion conveys state, quick, ease-out, with reduced-motion fallback.
+- [ ] Headings don't overflow at any breakpoint.
+- [ ] Detector run on changed CSS / affected route; findings fixed or justified.
+- [ ] Verified light/dark + mobile/desktop in-browser.
diff --git a/AGENTS.md b/AGENTS.md
index a574179..29382af 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -65,6 +65,7 @@ Before review or handoff, run at least `just fix` and the narrowest relevant tes
 
 ### Front-end implementation notes
 
+- **Design guidance: use the `frontend-design` skill for any UI work** (Dioxus RSX, routes, `assets/styling/*.css`, layout/color/type/motion/state/copy). It carries the adapted Impeccable design method for Polymodel's committed blueprint identity and product register. Companions: `DESIGN.md` (repo root, the blueprint design system as machine-readable tokens mirroring `theme.css`), `tools/design-detector/` (deterministic no-install linter — `node tools/design-detector/detect.mjs --json assets/styling/` or a rendered route; scans CSS/HTML, not `.rs`), and Confluence [*Front-end design guidance*](https://radiant-industries.atlassian.net/wiki/spaces/PM/pages/655362) in space `PM` (durable human-facing version).
 - Dioxus asset declarations use source paths, but served asset URLs are flattened into `/assets/`. For example, declare a font with `asset!("/assets/fonts/proza-libre/ProzaLibre-Regular.woff2", ...)`, but reference it from CSS as `url("/assets/ProzaLibre-Regular.woff2")`. Verify font and model asset paths in browser network output when changing asset declarations.
 - Keep generated lexicon/API code out of routine formatting churn. `crates/polymodel-api` is generated and is ignored by `rustfmt.toml`; do not include generated reformatting in ordinary feature slices unless the task is explicitly about regeneration or codegen output.
 - Do not commit Playwright MCP scratch output. `.playwright-mcp/` contains local browser logs/snapshots from manual checks and should stay ignored/untracked.
diff --git a/DESIGN.md b/DESIGN.md
new file mode 100644
index 0000000..952edbe
--- /dev/null
+++ b/DESIGN.md
@@ -0,0 +1,202 @@
+---
+name: Polymodel
+description: Blueprint/technical-drawing design system for an AT Protocol model-sharing app.
+colors:
+  base: "#f5f1e8"
+  surface: "#fffdf7"
+  overlay: "#e8edf0"
+  ink: "#17252f"
+  emphasis: "#0c1f2c"
+  subtle: "#445461"
+  muted: "#6a747b"
+  primary: "#1f6d8a"
+  secondary: "#5a8797"
+  tertiary: "#0f4159"
+  action: "#c5652a"
+  link: "#a24d1f"
+  border: "#a9b8bf"
+  highlight: "#d8e5e9"
+  error: "#a13f32"
+  warning: "#b36a16"
+  success: "#2d7358"
+typography:
+  heading:
+    fontFamily: "Proza Libre, system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, sans-serif"
+    fontWeight: 600
+    lineHeight: 1.3
+  body:
+    fontFamily: "Proza Libre, system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, sans-serif"
+    fontWeight: 400
+    fontSize: "16px"
+    lineHeight: 1.55
+  mono:
+    fontFamily: "Ioskeley Mono, IBM Plex Mono, Consolas, monospace"
+    fontSize: "0.72rem"
+    letterSpacing: "0.04em"
+rounded:
+  panel: "2px"
+  square: "0px"
+spacing:
+  base: "16px"
+components:
+  button:
+    backgroundColor: "{colors.surface}"
+    textColor: "{colors.ink}"
+    rounded: "{rounded.panel}"
+    padding: "0.55rem 0.8rem"
+  button-primary:
+    backgroundColor: "{colors.action}"
+    textColor: "{colors.base}"
+    rounded: "{rounded.panel}"
+    padding: "0.55rem 0.8rem"
+  button-secondary:
+    backgroundColor: "{colors.surface}"
+    textColor: "{colors.tertiary}"
+    rounded: "{rounded.panel}"
+  input:
+    backgroundColor: "{colors.base}"
+    textColor: "{colors.ink}"
+    rounded: "{rounded.panel}"
+    padding: "0.75rem 0.85rem"
+  card:
+    backgroundColor: "{colors.surface}"
+    textColor: "{colors.ink}"
+    rounded: "{rounded.panel}"
+  status-pill:
+    backgroundColor: "{colors.surface}"
+    textColor: "{colors.subtle}"
+    rounded: "{rounded.panel}"
+    typography: "{typography.mono}"
+---
+
+# Design System: Polymodel
+
+## 1. Overview
+
+**Creative North Star: "The Drafting Table"**
+
+Polymodel looks like a set of well-kept engineering blueprints rendered for the web. The page is drafting paper; content sits on crisp bordered panels with near-square corners; technical metadata is set in monospace the way a drawing carries its measurements; empty media reads as a faint drafting grid awaiting geometry. The teal primary is drawing-ink blue; a single warm orange is the one action accent, used like a redline. It is a **product** surface: design serves the task of browsing, judging, downloading, and publishing printable things. The tool should disappear into the work.
+
+This system explicitly rejects the flat-SaaS dashboard look (rounded cards everywhere, purple/blue gradients, soft shadows, Inter-for-everything) and the reflexive dark-terminal "developer tool" aesthetic. Warmth comes from the paper tone, the humanist type, and the orange accent — not from decoration. Familiarity is a feature: a maker fluent in Printables should trust every control on sight.
+
+**Key Characteristics:**
+- Drafting-paper base, drawing-ink teal, single warm-orange action accent.
+- Near-square corners (2px panels, 0px controls); crisp 1px borders over shadow.
+- Monospace for all technical metadata (dimensions, formats, DIDs/handles, counts, status).
+- Drafting-grid placeholders instead of gray boxes.
+- First-class light **and** dark schemes; restrained, state-driven color and motion.
+
+## 2. Colors
+
+A restrained palette: a tinted drafting-paper neutral ramp, one drawing-ink teal that carries structure, and a single warm orange reserved for action. Every token has a dark-scheme value (see `assets/styling/theme.css`; tonal/dark values live in the `.impeccable/design.json` sidecar).
+
+### Primary
+- **Drawing-Ink Teal** (#1f6d8a): The structural brand color — active tabs, selected state, focus rings, section emphasis, grid lines (at low alpha). Carries identity without being the action color.
+
+### Secondary
+- **Slate Teal** (#5a8797): Supporting teal for secondary controls and quieter structural accents.
+- **Deep Teal** (#0f4159): High-emphasis teal for hover ink and strong labels against light surfaces.
+
+### Tertiary
+- **Redline Orange** (#c5652a): The single warm action accent — primary buttons and the one element that should pull the eye to "do this." **Action only, never decoration.**
+- **Rust Link** (#a24d1f): Inline text links, distinct from the action button so links don't read as buttons.
+
+### Neutral
+- **Drafting Paper** (#f5f1e8): The body background. A warm paper tone tinted toward the brand — the blueprint substrate, not a generic off-white.
+- **Sheet** (#fffdf7): Raised panel/card/surface background.
+- **Blueprint Overlay** (#e8edf0): Cool inset background for media wells and grid placeholders.
+- **Ink** (#17252f): Body text.
+- **Emphasis** (#0c1f2c) / **Subtle** (#445461) / **Muted** (#6a747b): The text-emphasis ramp; pick by importance, never drop body to muted-gray on the paper base.
+- **Border** (#a9b8bf): The 1px line on every panel, control, and pill.
+- **Highlight** (#d8e5e9): Selection/skeleton shimmer tint.
+
+### Status
+- **Error** (#a13f32) / **Warning** (#b36a16) / **Success** (#2d7358): Semantic state only, paired with shape/label, never color-alone.
+
+### Named Rules
+**The One Redline Rule.** Redline Orange (#c5652a) is the action accent. It marks the single primary action in a view and nothing decorative. If two things on a screen are orange, one is wrong.
+
+**The Paper-Is-Identity Rule.** The body background is drafting paper (#f5f1e8), a deliberate tinted neutral — not the AI warm-cream default. Never rename it `--paper`/`--cream`/`--sand` and never swap it for a flat #fff/off-white; the paper tone carries the blueprint metaphor.
+
+**The Ink-Not-Gray Rule.** Body text reaches for the ink end of the ramp. Light-gray "for elegance" on the tinted paper is the contrast trap; when a value is close to 4.5:1, move toward Ink/Emphasis, not Muted.
+
+## 3. Typography
+
+**Heading Font:** Proza Libre (with system-ui, -apple-system, Segoe UI, sans-serif)
+**Body Font:** Proza Libre (with system-ui, -apple-system, Segoe UI, sans-serif)
+**Label/Mono Font:** Ioskeley Mono (with IBM Plex Mono, Consolas, monospace)
+
+**Character:** One humanist sans (Proza Libre) carries headings, body, labels, and buttons — warm and legible, the workshop-manual voice. A distinctive monospace (Ioskeley Mono) carries everything technical, like dimensions stamped on a drawing. The contrast axis is sans-vs-mono, not two near-identical sans faces.
+
+### Hierarchy
+- **Heading** (Proza Libre, 600, ~1rem–1.18rem, line-height 1.3): Card titles, section and page headings. Fixed rem scale, tight ratio.
+- **Body** (Proza Libre, 400, 16px, line-height 1.55): Paragraphs and descriptions; cap prose at 65–75ch.
+- **Title (card)** (Proza Libre, 600, clamp(1rem, 1.8vw, 1.18rem)): The one tolerated small fluid step, for thing-card titles in a fluid grid.
+- **Meta/Label** (Ioskeley Mono, ~0.72rem, letter-spacing 0.04–0.08em, often uppercase): Dimensions, file formats, DIDs/handles, counts, status pills, eyebrows/kickers.
+
+### Named Rules
+**The Mono-Is-Metadata Rule.** Monospace is reserved for technical metadata (measurements, formats, identifiers, counts, status). Prose and UI labels are never mono; metadata is never set in the body sans.
+
+**The Fixed-Scale Rule.** Product headings use a fixed rem scale, not fluid `clamp()` — a heading that shrinks inside a panel looks worse, not designed. The card-title clamp is the only sanctioned exception.
+
+**The One-Eyebrow Rule.** The uppercase tracked mono kicker (`.eyebrow`/`.product-kicker`) is part of the voice for *deliberate, occasional* use — never an eyebrow stacked above every section.
+
+## 4. Elevation
+
+Flat by default. Depth comes from crisp 1px borders and tonal layering (paper → sheet → overlay), not shadows. The only shadow in the system is a 1px hairline under panels that reads as a sheet of paper lifting off the table, not a floating SaaS card.
+
+### Shadow Vocabulary
+- **Paper hairline** (`box-shadow: 0 1px 0 color-mix(in srgb, var(--color-text) 8%, transparent)`): The single resting elevation on cards/panels. Borders do the structural work; this only seats the sheet.
+
+### Named Rules
+**The Border-Over-Shadow Rule.** Structure is drawn with 1px borders and background-tone steps, never with soft drop shadows. Never pair a 1px border with a wide (≥16px) soft shadow on the same element (the ghost-card tell).
+
+## 5. Components
+
+### Buttons
+- **Shape:** Near-square (2px radius); base controls render at 0px corners. Never round to pill (except deliberate tags) or 12px+.
+- **Default:** Sheet background, 1px border, ink text. Hover shifts border to teal and text to deep teal.
+- **Primary:** Redline Orange fill, paper-colored text — the one action. Hover brightens slightly (`filter: brightness(1.04)`), no transform bounce.
+- **Secondary / Ghost:** Teal border + deep-teal text (secondary); transparent background (ghost).
+
+### Chips / Tabs / Status pills
+- **Style:** 1px border, near-square, mono text, ~0.72rem. Transparent at rest.
+- **State:** Active tab / selected pill take a teal border, deep-teal text, and an 8% teal wash. Muted and error variants recolor the border + text + faint wash to match the semantic role.
+
+### Cards / Containers
+- **Corner Style:** 2px (panel radius).
+- **Background:** Sheet (#fffdf7) over the paper base.
+- **Border:** 1px Border (#a9b8bf) — the defining line.
+- **Shadow Strategy:** Paper hairline only (see Elevation).
+- **Internal Padding:** ~1rem; metadata rows in mono, subordinate to title/creator.
+- **Media:** Drafting-grid background (20px grid, grid-line color) for previews and placeholders — never a flat gray box; missing media draws nested registration rectangles, not fake content.
+
+### Inputs / Fields
+- **Style:** Paper-base fill, 1px border, 2px radius, body sans.
+- **Focus:** Border shifts to teal with a 2px translucent teal outline (`outline: 2px solid color-mix(... primary 25% ...)`). Focus is always visible.
+- **Error / Disabled:** Error recolors border+text to Error and adds a faint wash; disabled drops contrast and removes the pointer affordance.
+
+### Navigation
+- Product nav (wordmark, Browse, Search, Publish, session control), not demo/workflow copy. Standard top-bar pattern; active state uses the tab treatment. Reachable search globally.
+
+### Signature: the blueprint preview / skeleton
+The drafting-grid media well (`.blueprint-media`) and the shimmer skeletons (`.skeleton-*`, `blueprint-skeleton` keyframes) are the system's signature. Content loads through skeletons over a stable grid, never a centered spinner.
+
+## 6. Do's and Don'ts
+
+### Do:
+- **Do** reuse the tokens in `assets/styling/theme.css` and the component vocabulary in `base.css`/`cards.css`; extend, don't fork.
+- **Do** set all technical metadata (dimensions, formats, DIDs/handles, counts, status) in Ioskeley Mono.
+- **Do** keep body/placeholder contrast ≥ 4.5:1 in both schemes; move text toward Ink, not Muted, when close.
+- **Do** ship every interactive state — default, hover, focus, active, disabled, loading, error — with visible keyboard focus.
+- **Do** use drafting-grid placeholders and skeletons for loading/empty media; write empty states that teach (publish-your-first-thing).
+- **Do** keep motion to 150–250ms, ease-out, for state/feedback/loading/viewer-readiness only, with a `prefers-reduced-motion` fallback.
+
+### Don't:
+- **Don't** swap the drafting-paper base for a flat off-white, or rename it `--paper`/`--cream`/`--sand`.
+- **Don't** round cards/inputs to 12px+ or reach for full pills outside tags; the near-square corner is the identity.
+- **Don't** use more than one Redline-Orange action per view, or use the action color for decoration.
+- **Don't** use gradient text, glassmorphism-by-default, hero-metric templates, identical icon-card grids, or an uppercase eyebrow above every section.
+- **Don't** pair a 1px border with a wide soft drop shadow (ghost-card), use `border-left` >1px as a colored stripe, or animate `<img>` on hover.
+- **Don't** put a display font — or any non-mono face — in technical metadata, or drop body text to muted gray on the paper base.
+- **Don't** land on generic flat-SaaS or generic dark-terminal looks; the answer to "what is this" is the blueprint identity.
diff --git a/tools/design-detector/README.md b/tools/design-detector/README.md
new file mode 100644
index 0000000..775248b
--- /dev/null
+++ b/tools/design-detector/README.md
@@ -0,0 +1,27 @@
+# Design detector
+
+Deterministic linter for AI-generated front-end design tells (gray-on-color, low contrast, side-stripe borders, bounce/elastic easing, gradient text, overused fonts, ghost-card shadows, over-rounding, …) plus design-system drift against our `DESIGN.md`.
+
+Vendored from **[Impeccable](https://github.com/pbakaus/impeccable)** by Paul Bakaus, Apache-2.0 (SPDX headers preserved in source). This is the detector engine only — the upstream skill/command workflow is **not** vendored. Our adapted design guidance lives in the `frontend-design` skill (`.polytoken/skills/frontend-design/`) and Confluence (space PM, *Front-end design guidance*).
+
+## Usage
+
+```sh
+# Static scan of our CSS (plain Node, no browser)
+node tools/design-detector/detect.mjs --json assets/styling/
+
+# Scan a rendered route (drives a real browser; needs `just serve` running)
+node tools/design-detector/detect.mjs --json http://localhost:8080
+```
+
+Exit code `0` = clean, `2` = findings. JSON entries carry `antipattern`, `severity` (advisory/warning), `file`, `line`, `snippet`.
+
+## Coverage notes
+
+- Scans **CSS and rendered HTML** — it does **not** parse `.rs` RSX. Treat a clean CSS scan plus a rendered-route scan as the coverage; rely on the `frontend-design` skill checklist for RSX-level structure.
+- `design-system-*` findings (radius/color outside our scale) are powered by the token frontmatter in repo-root `DESIGN.md`. Keep `DESIGN.md` in sync with `assets/styling/theme.css` for those checks to stay meaningful.
+- Scratch/config (`.impeccable/`) is gitignored.
+
+## Updating
+
+Re-vendor from upstream by copying `skill/scripts/detector/`, `skill/scripts/lib/`, `skill/scripts/context.mjs`, and `skill/scripts/detect.mjs` (the detector's transitive closure) over this directory. Don't hand-edit the engine.
diff --git a/tools/design-detector/context.mjs b/tools/design-detector/context.mjs
new file mode 100644
index 0000000..adf03e0
--- /dev/null
+++ b/tools/design-detector/context.mjs
@@ -0,0 +1,961 @@
+/**
+ * Context loader: prints PRODUCT.md (and DESIGN.md if present) as one
+ * markdown block on stdout, or exits with empty stdout when no PRODUCT.md
+ * is found anywhere. The skill keys off "empty stdout" to branch into the
+ * init flow.
+ *
+ * Path resolution (first match wins):
+ *   1. Active project root, if PRODUCT.md or DESIGN.md is there
+ *   2. Active project .agents/context/ then docs/
+ *   3. Monorepo root context, using the same order, as a per-file fallback
+ *   4. $IMPECCABLE_CONTEXT_DIR (absolute or cwd-relative) — power-user
+ *      escape hatch, only consulted when defaults are empty
+ *   5. Active project root as a "nothing found" default
+ *
+ * `resolveContextDir()` and `loadContext()` are also exported for the
+ * server-side scripts (live.mjs, live-server.mjs) that need the structured
+ * shape rather than the markdown block.
+ */
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { parseTargetOptions } from './lib/target-args.mjs';
+
+const PRODUCT_NAMES = ['PRODUCT.md', 'Product.md', 'product.md'];
+const DESIGN_NAMES = ['DESIGN.md', 'Design.md', 'design.md'];
+const FALLBACK_DIRS = ['.agents/context', 'docs'];
+const MONOREPO_MARKER_FILES = ['pnpm-workspace.yaml', 'turbo.json', 'nx.json', 'lerna.json'];
+const MONOREPO_FALLBACK_PROJECT_DIRS = ['apps', 'packages'];
+const WORKSPACE_DISCOVERY_IGNORED_DIRS = new Set([
+  'node_modules',
+  '.git',
+  'dist',
+  'build',
+  '.next',
+  '.nuxt',
+  '.svelte-kit',
+  '.turbo',
+  '.cache',
+  'coverage',
+]);
+
+// ─── Update check ──────────────────────────────────────────────────────────
+// Piggyback a lightweight skill-version check on the once-per-session boot.
+// When a newer skill ships, append an UPDATE_AVAILABLE directive so the agent
+// can offer `npx impeccable update`. Everything here is best-effort and
+// silent on failure: a network problem, sandbox, or missing cache must never
+// block context output or print an error.
+
+const UPDATE_HOST = (process.env.IMPECCABLE_UPDATE_HOST || 'https://impeccable.style').replace(/\/$/, '');
+const UPDATE_CACHE_PATH =
+  process.env.IMPECCABLE_UPDATE_CACHE || path.join(os.homedir(), '.impeccable', 'update-check.json');
+const CHECK_INTERVAL_MS = 24 * 60 * 60 * 1000; // throttle the network poll to once a day
+const RENOTIFY_INTERVAL_MS = 7 * 24 * 60 * 60 * 1000; // don't re-surface the same version for a week
+const FETCH_TIMEOUT_MS = 1200;
+
+export function resolveContextDir(cwd = process.cwd(), options = {}) {
+  return resolveContext(cwd, options).contextDir;
+}
+
+export function loadContext(cwd = process.cwd(), options = {}) {
+  const resolved = resolveContext(cwd, options);
+  const absCwd = path.resolve(cwd);
+  const productPath = resolved.productPath;
+  const designPath = resolved.designPath;
+  const product = productPath ? safeRead(productPath) : null;
+  const design = designPath ? safeRead(designPath) : null;
+  return {
+    hasProduct: !!product,
+    product,
+    productPath: productPath ? path.relative(absCwd, productPath) : null,
+    hasDesign: !!design,
+    design,
+    designPath: designPath ? path.relative(absCwd, designPath) : null,
+    contextDir: resolved.contextDir,
+    productContextDir: productPath ? path.dirname(productPath) : null,
+    designContextDir: designPath ? path.dirname(designPath) : null,
+    projectRoot: resolved.projectRoot,
+    repoRoot: resolved.repoRoot,
+    isMonorepo: resolved.isMonorepo,
+  };
+}
+
+function resolveContext(cwd = process.cwd(), options = {}) {
+  const absCwd = path.resolve(cwd);
+  const project = resolveProject(absCwd, options);
+  const projectContextDir = resolveLocalContextDir(project.projectRoot);
+  const rootContextDir = project.isMonorepo && project.repoRoot !== project.projectRoot
+    ? resolveLocalContextDir(project.repoRoot)
+    : null;
+
+  let productPath =
+    (projectContextDir ? firstExisting(projectContextDir, PRODUCT_NAMES) : null)
+    || (rootContextDir ? firstExisting(rootContextDir, PRODUCT_NAMES) : null);
+  let designPath =
+    (projectContextDir ? firstExisting(projectContextDir, DESIGN_NAMES) : null)
+    || (rootContextDir ? firstExisting(rootContextDir, DESIGN_NAMES) : null);
+
+  let envContextDir = null;
+  if (!productPath && !designPath) {
+    envContextDir = resolveEnvContextDir(absCwd);
+    if (envContextDir) {
+      productPath = firstExisting(envContextDir, PRODUCT_NAMES);
+      designPath = firstExisting(envContextDir, DESIGN_NAMES);
+    }
+  }
+
+  return {
+    contextDir: productPath
+      ? path.dirname(productPath)
+      : designPath
+        ? path.dirname(designPath)
+        : envContextDir || project.projectRoot,
+    productPath,
+    designPath,
+    projectRoot: project.projectRoot,
+    repoRoot: project.repoRoot,
+    isMonorepo: project.isMonorepo,
+    targetDir: project.targetDir,
+  };
+}
+
+export function resolveProjectRoot(cwd = process.cwd(), options = {}) {
+  return resolveProject(cwd, options).projectRoot;
+}
+
+export function resolveTargetSelection(cwd = process.cwd(), options = {}) {
+  if (hasTargetOption(options)) return null;
+  const project = resolveProject(cwd);
+  if (
+    !project.isMonorepo
+    || !project.projectRoot
+    || !project.repoRoot
+    || path.resolve(project.projectRoot) !== path.resolve(project.repoRoot)
+  ) {
+    return null;
+  }
+  const targetCandidates = discoverTargetCandidates(project.repoRoot);
+  // No discoverable child apps (e.g. `workspaces: ["."]`, a root-only workspace,
+  // or a marker file with no apps/packages children): there is nothing to choose,
+  // so treat the repo root as the active project rather than blocking on an empty
+  // selection prompt that the user cannot answer.
+  if (targetCandidates.length === 0) return null;
+  return {
+    targetPath: null,
+    projectRoot: project.projectRoot,
+    repoRoot: project.repoRoot,
+    targetCandidates,
+  };
+}
+
+function resolveProject(cwd = process.cwd(), options = {}) {
+  const absCwd = path.resolve(cwd);
+  const targetDir = resolveTargetDir(absCwd, options);
+  let repoRoot = findMonorepoRoot(targetDir);
+  if (!repoRoot && targetDir !== absCwd) {
+    const cwdRepoRoot = findMonorepoRoot(absCwd);
+    if (cwdRepoRoot && isPathInside(targetDir, cwdRepoRoot)) {
+      repoRoot = cwdRepoRoot;
+    }
+  }
+  if (!repoRoot) {
+    return {
+      targetDir,
+      projectRoot: absCwd,
+      repoRoot: absCwd,
+      isMonorepo: false,
+    };
+  }
+  return {
+    targetDir,
+    projectRoot: resolveWorkspaceProjectRoot(repoRoot, targetDir) || repoRoot,
+    repoRoot,
+    isMonorepo: true,
+  };
+}
+
+function isPathInside(candidate, root) {
+  const rel = path.relative(root, candidate);
+  return !!rel && !rel.startsWith('..') && !path.isAbsolute(rel);
+}
+
+function resolveLocalContextDir(root) {
+  if (firstExisting(root, [...PRODUCT_NAMES, ...DESIGN_NAMES])) {
+    return root;
+  }
+  for (const rel of FALLBACK_DIRS) {
+    const candidate = path.resolve(root, rel);
+    if (firstExisting(candidate, [...PRODUCT_NAMES, ...DESIGN_NAMES])) {
+      return candidate;
+    }
+  }
+  return null;
+}
+
+function resolveEnvContextDir(cwd) {
+  const envDir = process.env.IMPECCABLE_CONTEXT_DIR;
+  if (!envDir || !envDir.trim()) return null;
+  const trimmed = envDir.trim();
+  return path.isAbsolute(trimmed) ? trimmed : path.resolve(cwd, trimmed);
+}
+
+function resolveTargetDir(cwd, options = {}) {
+  const targetPath = options && typeof options === 'object' ? options.targetPath : null;
+  if (!targetPath || !String(targetPath).trim()) return cwd;
+  const abs = path.isAbsolute(targetPath) ? targetPath : path.resolve(cwd, targetPath);
+  try {
+    const stat = fs.statSync(abs);
+    return stat.isDirectory() ? abs : path.dirname(abs);
+  } catch {
+    return path.extname(abs) ? path.dirname(abs) : abs;
+  }
+}
+
+function findMonorepoRoot(startDir) {
+  let dir = path.resolve(startDir);
+  const homeDir = path.resolve(os.homedir());
+  while (true) {
+    if (dir === homeDir) return null;
+    // isMonorepoRoot is checked before hasGitBoundary on purpose: a workspace
+    // root that also carries its own .git is still recognized. The trade-off is
+    // deliberate — a directory with a monorepo *marker* but no workspace patterns
+    // and no apps/packages children is not a monorepo root, so its .git stops
+    // traversal and a further-up root is not searched. The nested .git is treated
+    // as an independent project boundary, which is the intended isolation.
+    if (isMonorepoRoot(dir)) return dir;
+    if (hasGitBoundary(dir)) return null;
+    const parent = path.dirname(dir);
+    if (parent === dir) return null;
+    dir = parent;
+  }
+}
+
+function isMonorepoRoot(dir) {
+  if (readWorkspacePatterns(dir).some((pattern) => !normalizeWorkspacePattern(pattern).startsWith('!'))) return true;
+  if (!MONOREPO_MARKER_FILES.some((file) => fs.existsSync(path.join(dir, file)))) return false;
+  return hasFallbackWorkspaceChildren(dir);
+}
+
+function hasGitBoundary(dir) {
+  return fs.existsSync(path.join(dir, '.git'));
+}
+
+function hasFallbackWorkspaceChildren(dir) {
+  for (const name of MONOREPO_FALLBACK_PROJECT_DIRS) {
+    const base = path.join(dir, name);
+    let entries;
+    try {
+      entries = fs.readdirSync(base, { withFileTypes: true });
+    } catch {
+      continue;
+    }
+    if (entries.some((entry) => entry.isDirectory() && !isIgnoredWorkspaceDiscoveryDir(entry.name))) return true;
+  }
+  return false;
+}
+
+function discoverTargetCandidates(repoRoot) {
+  const roots = new Map();
+  const patterns = readWorkspacePatterns(repoRoot);
+  for (const pattern of patterns) {
+    for (const root of discoverRootsForPattern(repoRoot, pattern)) {
+      roots.set(path.relative(repoRoot, root).split(path.sep).join('/'), root);
+    }
+  }
+  if (MONOREPO_MARKER_FILES.some((file) => fs.existsSync(path.join(repoRoot, file)))) {
+    for (const name of MONOREPO_FALLBACK_PROJECT_DIRS) {
+      const base = path.join(repoRoot, name);
+      let entries;
+      try {
+        entries = fs.readdirSync(base, { withFileTypes: true });
+      } catch {
+        continue;
+      }
+      for (const entry of entries) {
+        if (!entry.isDirectory() || isIgnoredWorkspaceDiscoveryDir(entry.name)) continue;
+        const root = path.join(base, entry.name);
+        roots.set(path.relative(repoRoot, root).split(path.sep).join('/'), root);
+      }
+    }
+  }
+  return [...roots.entries()]
+    .filter(([rel]) => rel && !rel.startsWith('..'))
+    // Honor negated workspace patterns (e.g. "!packages/internal"). resolveWorkspaceProjectRoot
+    // sends an excluded package back to the repo root, so an excluded folder must not appear as a
+    // selectable target — choosing it would silently resolve to the root instead.
+    .filter(([rel]) => !isExcludedByWorkspacePattern(rel.split('/').filter(Boolean), patterns))
+    .sort(([a], [b]) => a.localeCompare(b))
+    .map(([rel, root]) => {
+      const targetExample = findTargetExample(repoRoot, root);
+      return {
+        name: path.basename(root),
+        path: rel,
+        targetExample,
+        ...resolveCandidateContextSummary(repoRoot, root, targetExample),
+      };
+    });
+}
+
+function resolveCandidateContextSummary(repoRoot, projectRoot, targetPath) {
+  const ctx = resolveContext(repoRoot, { targetPath });
+  return {
+    productStatus: contextSourceStatus(ctx.productPath, repoRoot, projectRoot),
+    productPath: contextSourcePath(ctx.productPath, repoRoot),
+    designStatus: contextSourceStatus(ctx.designPath, repoRoot, projectRoot),
+    designPath: contextSourcePath(ctx.designPath, repoRoot),
+  };
+}
+
+// Selection candidates surface one of four statuses: 'child' (a canonical
+// PRODUCT.md/DESIGN.md directly in the app root), 'inherited' (resolved from the
+// repo root in a monorepo), 'missing' (no file found), and 'fallback'. 'fallback'
+// intentionally covers two non-canonical locations: a file inside the project
+// root but in a subdirectory (FALLBACK_DIRS, e.g. `.agents/context/`), and a file
+// outside both the project and repo roots (IMPECCABLE_CONTEXT_DIR override).
+function contextSourceStatus(filePath, repoRoot, projectRoot) {
+  if (!filePath) return 'missing';
+  const absPath = path.resolve(filePath);
+  const absProjectRoot = path.resolve(projectRoot);
+  const absRepoRoot = path.resolve(repoRoot);
+  if (isPathInsideOrEqual(absPath, absProjectRoot)) {
+    return path.dirname(absPath) === absProjectRoot ? 'child' : 'fallback';
+  }
+  if (absProjectRoot !== absRepoRoot && isPathInsideOrEqual(absPath, absRepoRoot)) {
+    return 'inherited';
+  }
+  return 'fallback';
+}
+
+function contextSourcePath(filePath, repoRoot) {
+  if (!filePath) return null;
+  const rel = path.relative(repoRoot, filePath);
+  if (rel && !rel.startsWith('..') && !path.isAbsolute(rel)) {
+    return rel.split(path.sep).join('/');
+  }
+  return filePath;
+}
+
+function discoverRootsForPattern(repoRoot, rawPattern) {
+  const pattern = normalizeWorkspacePattern(rawPattern);
+  if (!pattern || pattern.startsWith('!')) return [];
+  const segments = pattern.split('/').filter(Boolean);
+  if (!segments.length) return [];
+  const firstGlobIndex = segments.findIndex((segment) => segment.includes('*'));
+  const literalPrefix = firstGlobIndex === -1 ? segments : segments.slice(0, firstGlobIndex);
+  const base = path.join(repoRoot, ...literalPrefix);
+  if (!fs.existsSync(base)) return [];
+  if (segments.includes('**')) {
+    const packageRoots = [];
+    walkDirs(base, (dir) => {
+      if (dir !== base && isCandidateProjectRoot(dir)) packageRoots.push(dir);
+    });
+    if (packageRoots.length) return packageRoots;
+    return directChildDirs(base);
+  }
+  return expandSimplePattern(repoRoot, segments);
+}
+
+function expandSimplePattern(repoRoot, patternSegments, index = 0, current = repoRoot) {
+  if (index >= patternSegments.length) return fs.existsSync(current) ? [current] : [];
+  const segment = patternSegments[index];
+  if (!segment.includes('*')) {
+    return expandSimplePattern(repoRoot, patternSegments, index + 1, path.join(current, segment));
+  }
+  let entries;
+  try {
+    entries = fs.readdirSync(current, { withFileTypes: true });
+  } catch {
+    return [];
+  }
+  const roots = [];
+  for (const entry of entries) {
+    if (!entry.isDirectory() || isIgnoredWorkspaceDiscoveryDir(entry.name)) continue;
+    if (!segmentMatches(segment, entry.name)) continue;
+    roots.push(...expandSimplePattern(repoRoot, patternSegments, index + 1, path.join(current, entry.name)));
+  }
+  return roots;
+}
+
+function directChildDirs(dir) {
+  try {
+    return fs.readdirSync(dir, { withFileTypes: true })
+      .filter((entry) => entry.isDirectory() && !isIgnoredWorkspaceDiscoveryDir(entry.name))
+      .map((entry) => path.join(dir, entry.name));
+  } catch {
+    return [];
+  }
+}
+
+function walkDirs(root, visit) {
+  let entries;
+  try {
+    entries = fs.readdirSync(root, { withFileTypes: true });
+  } catch {
+    return;
+  }
+  for (const entry of entries) {
+    if (!entry.isDirectory() || isIgnoredWorkspaceDiscoveryDir(entry.name)) continue;
+    const dir = path.join(root, entry.name);
+    visit(dir);
+    walkDirs(dir, visit);
+  }
+}
+
+function isCandidateProjectRoot(dir) {
+  return !!(
+    fs.existsSync(path.join(dir, 'package.json'))
+    || firstExisting(dir, [...PRODUCT_NAMES, ...DESIGN_NAMES])
+    || fs.existsSync(path.join(dir, 'src'))
+    || fs.existsSync(path.join(dir, 'app'))
+    || fs.existsSync(path.join(dir, 'pages'))
+    || fs.existsSync(path.join(dir, 'public'))
+  );
+}
+
+function isIgnoredWorkspaceDiscoveryDir(name) {
+  return name.startsWith('.') || WORKSPACE_DISCOVERY_IGNORED_DIRS.has(name);
+}
+
+function findTargetExample(repoRoot, projectRoot) {
+  const examples = [
+    'src/App.jsx',
+    'src/App.tsx',
+    'src/main.jsx',
+    'src/main.tsx',
+    'src/index.jsx',
+    'src/index.ts',
+    'app/page.tsx',
+    'pages/index.tsx',
+    'public/index.html',
+  ];
+  for (const rel of examples) {
+    const abs = path.join(projectRoot, rel);
+    if (fs.existsSync(abs)) return path.relative(repoRoot, abs).split(path.sep).join('/');
+  }
+  return path.relative(repoRoot, projectRoot).split(path.sep).join('/');
+}
+
+function resolveWorkspaceProjectRoot(repoRoot, targetDir) {
+  const rel = path.relative(repoRoot, targetDir);
+  if (!rel || rel.startsWith('..') || path.isAbsolute(rel)) return repoRoot;
+  const relSegments = rel.split(path.sep).filter(Boolean);
+  const patterns = readWorkspacePatterns(repoRoot);
+  const excluded = isExcludedByWorkspacePattern(relSegments, patterns);
+  if (!excluded) {
+    for (const pattern of patterns) {
+      const projectRoot = projectRootFromWorkspacePattern(repoRoot, relSegments, pattern);
+      if (projectRoot) return projectRoot;
+    }
+  }
+  if (excluded) return repoRoot;
+  if (
+    relSegments.length >= 2
+    && MONOREPO_FALLBACK_PROJECT_DIRS.includes(relSegments[0])
+  ) {
+    return path.join(repoRoot, relSegments[0], relSegments[1]);
+  }
+  const nearest = nearestProjectLikeRoot(repoRoot, targetDir);
+  if (nearest) return nearest;
+  return repoRoot;
+}
+
+function isExcludedByWorkspacePattern(relSegments, patterns) {
+  return patterns.some((rawPattern) => {
+    const pattern = normalizeWorkspacePattern(rawPattern);
+    if (!pattern.startsWith('!')) return false;
+    return workspacePatternMatchesRel(pattern.slice(1), relSegments);
+  });
+}
+
+function nearestProjectLikeRoot(repoRoot, targetDir) {
+  let dir = path.resolve(targetDir);
+  const stop = path.resolve(repoRoot);
+  while (dir && dir !== stop) {
+    if (
+      firstExisting(dir, [...PRODUCT_NAMES, ...DESIGN_NAMES])
+      || fs.existsSync(path.join(dir, 'package.json'))
+    ) {
+      return dir;
+    }
+    const parent = path.dirname(dir);
+    if (parent === dir) break;
+    dir = parent;
+  }
+  return null;
+}
+
+function nearestPackageRootBetween(repoRoot, targetDir, stopDir) {
+  let dir = path.resolve(targetDir);
+  const stop = path.resolve(stopDir || repoRoot);
+  const root = path.resolve(repoRoot);
+  while (dir && dir !== stop && isPathInsideOrEqual(dir, root)) {
+    if (fs.existsSync(path.join(dir, 'package.json'))) return dir;
+    const parent = path.dirname(dir);
+    if (parent === dir) break;
+    dir = parent;
+  }
+  return null;
+}
+
+function isPathInsideOrEqual(candidate, root) {
+  return path.resolve(candidate) === path.resolve(root) || isPathInside(candidate, root);
+}
+
+function workspacePatternMatchesRel(pattern, relSegments) {
+  const patternSegments = normalizeWorkspacePattern(pattern).split('/').filter(Boolean);
+  if (!patternSegments.length) return false;
+  if (patternSegments.includes('**')) {
+    const firstGlobIndex = patternSegments.findIndex((segment) => segment.includes('*'));
+    const literalPrefix = firstGlobIndex === -1
+      ? patternSegments
+      : patternSegments.slice(0, firstGlobIndex);
+    if (relSegments.length < literalPrefix.length + 1) return false;
+    for (let i = 0; i < literalPrefix.length; i++) {
+      if (!segmentMatches(literalPrefix[i], relSegments[i])) return false;
+    }
+    return true;
+  }
+  if (relSegments.length < patternSegments.length) return false;
+  for (let i = 0; i < patternSegments.length; i++) {
+    if (!segmentMatches(patternSegments[i], relSegments[i])) return false;
+  }
+  return true;
+}
+
+function readWorkspacePatterns(repoRoot) {
+  return [
+    ...readPackageWorkspaces(repoRoot),
+    ...readPnpmWorkspaces(repoRoot),
+    ...readLernaWorkspaces(repoRoot),
+  ].filter(Boolean);
+}
+
+function readPackageWorkspaces(repoRoot) {
+  const pkg = readJson(path.join(repoRoot, 'package.json'));
+  const workspaces = pkg?.workspaces;
+  if (Array.isArray(workspaces)) return workspaces;
+  if (Array.isArray(workspaces?.packages)) return workspaces.packages;
+  return [];
+}
+
+function readLernaWorkspaces(repoRoot) {
+  const lerna = readJson(path.join(repoRoot, 'lerna.json'));
+  return Array.isArray(lerna?.packages) ? lerna.packages : [];
+}
+
+function readPnpmWorkspaces(repoRoot) {
+  try {
+    const body = fs.readFileSync(path.join(repoRoot, 'pnpm-workspace.yaml'), 'utf-8');
+    const patterns = [];
+    let inPackages = false;
+    for (const line of body.split(/\r?\n/)) {
+      const trimmed = stripYamlInlineComment(line).trim();
+      if (!trimmed || trimmed.startsWith('#')) continue;
+      const flowMatch = trimmed.match(/^packages:\s*\[(.*)\]\s*$/);
+      if (flowMatch) {
+        patterns.push(...parseYamlFlowList(flowMatch[1]));
+        inPackages = false;
+        continue;
+      }
+      if (/^packages:\s*$/.test(trimmed)) {
+        inPackages = true;
+        continue;
+      }
+      if (inPackages && /^[A-Za-z0-9_-]+:\s*/.test(trimmed)) break;
+      if (inPackages) {
+        const match = trimmed.match(/^-\s*(.+)$/);
+        if (match) patterns.push(unquoteYamlValue(match[1]));
+      }
+    }
+    return patterns;
+  } catch {
+    return [];
+  }
+}
+
+function stripYamlInlineComment(line) {
+  let quote = null;
+  for (let i = 0; i < line.length; i++) {
+    const ch = line[i];
+    if ((ch === '"' || ch === "'") && line[i - 1] !== '\\') {
+      quote = quote === ch ? null : quote || ch;
+      continue;
+    }
+    if (ch === '#' && !quote) return line.slice(0, i);
+  }
+  return line;
+}
+
+function parseYamlFlowList(body) {
+  const items = [];
+  let quote = null;
+  let current = '';
+  for (let i = 0; i < body.length; i++) {
+    const ch = body[i];
+    if ((ch === '"' || ch === "'") && body[i - 1] !== '\\') {
+      quote = quote === ch ? null : quote || ch;
+      current += ch;
+      continue;
+    }
+    if (ch === ',' && !quote) {
+      const value = unquoteYamlValue(current);
+      if (value) items.push(value);
+      current = '';
+      continue;
+    }
+    current += ch;
+  }
+  const value = unquoteYamlValue(current);
+  if (value) items.push(value);
+  return items;
+}
+
+function unquoteYamlValue(value) {
+  return String(value || '')
+    .trim()
+    .replace(/^['"]|['"]$/g, '');
+}
+
+function readJson(filePath) {
+  try {
+    return JSON.parse(fs.readFileSync(filePath, 'utf-8'));
+  } catch {
+    return null;
+  }
+}
+
+function projectRootFromWorkspacePattern(repoRoot, relSegments, rawPattern) {
+  const pattern = normalizeWorkspacePattern(rawPattern);
+  if (!pattern || pattern.startsWith('!')) return null;
+  const patternSegments = pattern.split('/').filter(Boolean);
+  if (!patternSegments.length) return null;
+  if (patternSegments.includes('**')) {
+    return projectRootFromDoubleStarPattern(repoRoot, relSegments, patternSegments);
+  }
+  if (relSegments.length < patternSegments.length) return null;
+  for (let i = 0; i < patternSegments.length; i++) {
+    if (!segmentMatches(patternSegments[i], relSegments[i])) return null;
+  }
+  return path.join(repoRoot, ...relSegments.slice(0, patternSegments.length));
+}
+
+function projectRootFromDoubleStarPattern(repoRoot, relSegments, patternSegments) {
+  const firstGlobIndex = patternSegments.findIndex((segment) => segment.includes('*'));
+  const literalPrefix = firstGlobIndex === -1
+    ? patternSegments
+    : patternSegments.slice(0, firstGlobIndex);
+  if (relSegments.length < literalPrefix.length + 1) return null;
+  for (let i = 0; i < literalPrefix.length; i++) {
+    if (!segmentMatches(literalPrefix[i], relSegments[i])) return null;
+  }
+  const prefixDir = path.join(repoRoot, ...literalPrefix);
+  const targetDir = path.join(repoRoot, ...relSegments);
+  const packageRoot = nearestPackageRootBetween(repoRoot, targetDir, prefixDir);
+  if (packageRoot) return packageRoot;
+  return path.join(repoRoot, ...relSegments.slice(0, literalPrefix.length + 1));
+}
+
+function normalizeWorkspacePattern(pattern) {
+  return String(pattern || '')
+    .trim()
+    .replace(/^['"]|['"]$/g, '')
+    .replace(/^\.\//, '')
+    .replace(/\/+$/, '');
+}
+
+function segmentMatches(patternSegment, relSegment) {
+  if (patternSegment === '*') return true;
+  if (!patternSegment.includes('*')) return patternSegment === relSegment;
+  const re = new RegExp(`^${escapeRegExp(patternSegment).replace(/\\\*/g, '[^/]*')}$`);
+  return re.test(relSegment);
+}
+
+function firstExisting(dir, names) {
+  for (const name of names) {
+    const abs = path.join(dir, name);
+    if (fs.existsSync(abs)) return abs;
+  }
+  return null;
+}
+
+function safeRead(p) {
+  try {
+    return fs.readFileSync(p, 'utf-8');
+  } catch {
+    return null;
+  }
+}
+
+function escapeRegExp(value) {
+  return String(value).replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+/**
+ * Pull the register (`brand` or `product`) out of PRODUCT.md by looking
+ * for a `## Register` section and reading the first non-empty line that
+ * follows it. Returns null when the file is legacy / register-less.
+ */
+export function extractRegister(product) {
+  if (!product) return null;
+  const lines = product.split('\n');
+  for (let i = 0; i < lines.length; i++) {
+    if (/^##\s+Register\b/i.test(lines[i].trim())) {
+      for (let j = i + 1; j < lines.length; j++) {
+        const next = lines[j].trim();
+        if (!next) continue;
+        const word = next.toLowerCase();
+        if (word === 'brand' || word === 'product') return word;
+        return null;
+      }
+    }
+  }
+  return null;
+}
+
+/**
+ * Read the installed skill's own version from the sibling SKILL.md frontmatter
+ * (this file lives at `<skill>/scripts/context.mjs`). Returns null when the
+ * frontmatter is missing or unreadable.
+ */
+function readLocalSkillVersion() {
+  try {
+    const here = path.dirname(fileURLToPath(import.meta.url));
+    const skillMd = path.join(here, '..', 'SKILL.md');
+    const content = fs.readFileSync(skillMd, 'utf-8');
+    const match = content.match(/^version:\s*(.+)$/m);
+    return match ? match[1].trim().replace(/^["']|["']$/g, '') : null;
+  } catch {
+    return null;
+  }
+}
+
+function readUpdateCache() {
+  try {
+    return JSON.parse(fs.readFileSync(UPDATE_CACHE_PATH, 'utf-8'));
+  } catch {
+    return {};
+  }
+}
+
+function writeUpdateCache(cache) {
+  try {
+    fs.mkdirSync(path.dirname(UPDATE_CACHE_PATH), { recursive: true });
+    fs.writeFileSync(UPDATE_CACHE_PATH, JSON.stringify(cache));
+  } catch {
+    // Best-effort: a read-only home dir just means we re-poll next session.
+  }
+}
+
+/** Compare dotted numeric versions. Returns >0 when a is newer than b. */
+function compareSemver(a, b) {
+  const pa = String(a).split('.').map(n => parseInt(n, 10) || 0);
+  const pb = String(b).split('.').map(n => parseInt(n, 10) || 0);
+  for (let i = 0; i < Math.max(pa.length, pb.length); i++) {
+    const diff = (pa[i] || 0) - (pb[i] || 0);
+    if (diff !== 0) return diff;
+  }
+  return 0;
+}
+
+async function fetchLatestSkillVersion() {
+  try {
+    const res = await fetch(`${UPDATE_HOST}/api/version`, { signal: AbortSignal.timeout(FETCH_TIMEOUT_MS) });
+    if (!res.ok) return null;
+    const data = await res.json();
+    return typeof data?.skills === 'string' ? data.skills : null;
+  } catch {
+    return null; // offline, sandboxed, timed out, or bad JSON: all non-fatal
+  }
+}
+
+function buildUpdateDirective(localVersion, latestVersion) {
+  return (
+    `UPDATE_AVAILABLE: A newer Impeccable skill is available ` +
+    `(installed v${localVersion}, latest v${latestVersion}). ` +
+    `Before continuing, ask the user once: "A newer Impeccable (v${latestVersion}) is available. ` +
+    `Update now? It runs \`npx impeccable update\`." ` +
+    `If they agree, run \`npx impeccable update\` (the update applies to the next session, not this one). ` +
+    `Either way, continue the current task without waiting, and do not raise this again.`
+  );
+}
+
+/**
+ * Best-effort update directive for the boot output. Returns a string to append
+ * or null. Polls the version endpoint at most once per day (cached globally in
+ * the user's home dir) and re-surfaces a given version at most once per week so
+ * the agent never nags. Opt out entirely with IMPECCABLE_NO_UPDATE_CHECK=1.
+ */
+// Read the unified config's top-level `updateCheck` (local overrides shared).
+// Inlined rather than importing hook-lib so the boot path stays lightweight.
+function updateCheckDisabledByConfig(cwd = process.cwd()) {
+  let value;
+  for (const name of ['config.json', 'config.local.json']) {
+    try {
+      const raw = JSON.parse(fs.readFileSync(path.join(cwd, '.impeccable', name), 'utf-8'));
+      if (raw && typeof raw === 'object' && typeof raw.updateCheck === 'boolean') value = raw.updateCheck;
+    } catch { /* missing or malformed: ignore */ }
+  }
+  return value === false;
+}
+
+async function computeUpdateDirective(now = Date.now()) {
+  try {
+    if (process.env.IMPECCABLE_NO_UPDATE_CHECK) return null;
+    if (updateCheckDisabledByConfig()) return null;
+    const localVersion = readLocalSkillVersion();
+    if (!localVersion) return null;
+
+    const cache = readUpdateCache();
+
+    // Poll the network only when the throttle window has elapsed. Stamp
+    // lastCheck even on failure so an offline machine doesn't poll every boot.
+    if (!cache.lastCheck || now - cache.lastCheck > CHECK_INTERVAL_MS) {
+      const latest = await fetchLatestSkillVersion();
+      cache.lastCheck = now;
+      if (latest) cache.latestVersion = latest;
+      writeUpdateCache(cache);
+    }
+
+    const latest = cache.latestVersion;
+    if (!latest || compareSemver(latest, localVersion) <= 0) return null;
+
+    // Anti-nag: surface a given version at most once per RENOTIFY window.
+    if (cache.notifiedVersion === latest && cache.notifiedAt && now - cache.notifiedAt < RENOTIFY_INTERVAL_MS) {
+      return null;
+    }
+    cache.notifiedVersion = latest;
+    cache.notifiedAt = now;
+    writeUpdateCache(cache);
+
+    return buildUpdateDirective(localVersion, latest);
+  } catch {
+    return null;
+  }
+}
+
+async function cli() {
+  let cliOptions;
+  try {
+    cliOptions = parseCliOptions(process.argv.slice(2));
+  } catch (err) {
+    if (err?.name === 'TargetArgError') {
+      process.stderr.write(`${err.message}\n`);
+      process.exit(1);
+    }
+    throw err;
+  }
+  const targetProvided = hasTargetOption(cliOptions);
+  const targetExists = targetProvided ? pathExistsForTarget(process.cwd(), cliOptions.targetPath) : null;
+  const selection = resolveTargetSelection(process.cwd(), cliOptions);
+  if (selection) {
+    process.stdout.write(buildTargetSelectionDirective(selection) + '\n');
+    process.exit(0);
+  }
+  const ctx = loadContext(process.cwd(), cliOptions);
+  const updateDirective = await computeUpdateDirective();
+
+  if (!ctx.hasProduct) {
+    // Direct stdout message instead of relying on empty output as a signal
+    // — cheap models miss the empty case more often than the explicit one.
+    const parts = [
+      'NO_PRODUCT_MD: This project has no PRODUCT.md yet. ' +
+      'Stop the current task, load reference/init.md, and follow its ' +
+      'instructions to write PRODUCT.md before resuming.',
+    ];
+    parts.push(buildResolvedContextDirective(ctx, cliOptions, { targetExists }));
+    if (shouldWarnMissingTarget(ctx, targetProvided, targetExists)) {
+      parts.push(buildMissingTargetDirective());
+    }
+    if (updateDirective) parts.push(updateDirective);
+    process.stdout.write(parts.join('\n\n---\n\n') + '\n');
+    process.exit(0);
+  }
+  const parts = [`# PRODUCT.md\n\n${ctx.product.trim()}`];
+  if (ctx.hasDesign) {
+    parts.push(`# DESIGN.md\n\n${ctx.design.trim()}`);
+  }
+  parts.push(buildResolvedContextDirective(ctx, cliOptions, { targetExists }));
+  if (shouldWarnMissingTarget(ctx, targetProvided, targetExists)) {
+    parts.push(buildMissingTargetDirective());
+  }
+  const register = extractRegister(ctx.product);
+  const next = register
+    ? `NEXT STEP: This project's register is \`${register}\`. You MUST now read \`reference/${register}.md\` before producing any design output.`
+    : `NEXT STEP: You MUST now read the matching register reference (\`reference/brand.md\` or \`reference/product.md\`) before producing any design output. Pick based on PRODUCT.md above.`;
+  parts.push(next);
+  if (updateDirective) parts.push(updateDirective);
+  process.stdout.write(parts.join('\n\n---\n\n') + '\n');
+}
+
+function parseCliOptions(args) {
+  return parseTargetOptions(args, { strict: true });
+}
+
+function hasTargetOption(options) {
+  return !!(options && typeof options.targetPath === 'string' && options.targetPath.trim());
+}
+
+function pathExistsForTarget(cwd, targetPath) {
+  const abs = path.isAbsolute(targetPath) ? targetPath : path.resolve(cwd, targetPath);
+  return fs.existsSync(abs);
+}
+
+function buildResolvedContextDirective(ctx, options, { targetExists = null } = {}) {
+  const targetPath = hasTargetOption(options) ? options.targetPath : null;
+  return `RESOLVED_CONTEXT:\n${JSON.stringify({
+    targetPath,
+    ...(targetPath ? { targetExists } : {}),
+    projectRoot: ctx.projectRoot,
+    repoRoot: ctx.repoRoot,
+    productPath: ctx.productPath,
+    designPath: ctx.designPath,
+  }, null, 2)}`;
+}
+
+function shouldWarnMissingTarget(ctx, targetProvided, targetExists = null) {
+  if (ctx.isMonorepo && targetProvided && targetExists === false) return true;
+  return !!(
+    ctx.isMonorepo
+    && (!targetProvided || targetExists === false)
+    && ctx.projectRoot
+    && ctx.repoRoot
+    && path.resolve(ctx.projectRoot) === path.resolve(ctx.repoRoot)
+  );
+}
+
+function buildMissingTargetDirective() {
+  const script = process.argv[1] || 'context.mjs';
+  return (
+    'MONOREPO_TARGET_REQUIRED: This is a monorepo and context.mjs ran without --target. ' +
+    'If the user named a file, route, or child app, do not answer from this output. ' +
+    `Rerun \`node ${script} --target <path>\` and answer from that run's RESOLVED_CONTEXT fields.`
+  );
+}
+
+function buildTargetSelectionDirective(selection) {
+  return (
+    `TARGET_SELECTION_REQUIRED:\n${JSON.stringify(selection, null, 2)}\n\n` +
+    'Show each app with its productStatus/productPath and designStatus/designPath so the user can see child overrides, inherited root files, fallback files, or missing files before choosing. ' +
+    'Ask the user which app Impeccable should use, then rerun Impeccable helper commands from that child app cwd using this same scripts directory. ' +
+    'Use `--target <path>` only as a fallback when changing cwd is not possible, or when the user explicitly named a file/path.'
+  );
+}
+
+// Run cli() only when this module is the entry point. Compare realpaths
+// rather than endsWith(): a loose suffix match also fires for unrelated
+// scripts like `load-context.mjs`, and realpath tolerates symlinked
+// invocation (the test harness symlinks the skill dir).
+function invokedAsScript() {
+  const arg = process.argv[1];
+  if (!arg) return false;
+  try {
+    return fs.realpathSync(arg) === fs.realpathSync(fileURLToPath(import.meta.url));
+  } catch {
+    return false;
+  }
+}
+
+if (invokedAsScript()) {
+  cli();
+}
diff --git a/tools/design-detector/detect.mjs b/tools/design-detector/detect.mjs
new file mode 100644
index 0000000..cbc0469
--- /dev/null
+++ b/tools/design-detector/detect.mjs
@@ -0,0 +1,21 @@
+#!/usr/bin/env node
+
+import fs from 'node:fs';
+import path from 'node:path';
+import { pathToFileURL, fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const candidates = [
+  path.join(__dirname, 'detector', 'detect-antipatterns.mjs'),
+  path.join(__dirname, '..', '..', 'cli', 'engine', 'detect-antipatterns.mjs'),
+];
+const detectorPath = candidates.find(p => fs.existsSync(p));
+
+if (!detectorPath) {
+  process.stderr.write('Error: bundled detector not found.\n');
+  process.exit(1);
+}
+
+const { detectCli } = await import(pathToFileURL(detectorPath));
+
+await detectCli();
diff --git a/tools/design-detector/detector/browser/injected/index.mjs b/tools/design-detector/detector/browser/injected/index.mjs
new file mode 100644
index 0000000..fff8114
--- /dev/null
+++ b/tools/design-detector/detector/browser/injected/index.mjs
@@ -0,0 +1,1937 @@
+const IS_BROWSER = typeof window !== 'undefined';
+
+// ─── Section 7: Browser UI (IS_BROWSER only) ────────────────────────────────
+
+if (IS_BROWSER) {
+  // Detect extension mode via the script tag's data attribute or the document element fallback.
+  // currentScript is reliable for synchronously-executing scripts (which our IIFE is).
+  const _myScript = document.currentScript;
+  const EXTENSION_MODE = (_myScript && _myScript.dataset.impeccableExtension === 'true')
+    || document.documentElement.dataset.impeccableExtension === 'true';
+
+  // Kinpaku gold — pinned to the site's brand token (see
+  // site/styles/kinpaku-tokens.css --ks-kinpaku). Keep this in sync with
+  // the picker's C.brand in skill/scripts/live-browser.js and the kit's
+  // picker section in site/styles/kinpaku-kit.css.
+  //
+  // One color across both light and dark host pages. The outline is a
+  // 2px gesture pointing at an element + a labeled tag — it's a marker,
+  // not body text, so it doesn't need WCAG AA against the page. The
+  // label text inside the gold tag is dark (LABEL_INK) which has ~16:1
+  // against the leaf gold, so reading the rule name is solid in both
+  // modes. Hover deepens the gold (preserves chroma — never drops it,
+  // dropping chroma washes the gold into a sand/olive tone).
+  const BRAND_COLOR = 'oklch(84% 0.19 80.46)';
+  const BRAND_COLOR_HOVER = 'oklch(74% 0.18 80)';
+  const LABEL_INK = 'oklch(4% 0.004 95)';
+  const LABEL_BG = BRAND_COLOR;
+  const OUTLINE_COLOR = BRAND_COLOR;
+
+  // Inject hover styles via CSS (more reliable than JS event listeners)
+  const styleEl = document.createElement('style');
+  styleEl.textContent = `
+    @keyframes impeccable-reveal {
+      from { opacity: 0; }
+      to { opacity: 1; }
+    }
+    .impeccable-overlay:not(.impeccable-banner) {
+      pointer-events: none;
+      outline: 2px solid ${OUTLINE_COLOR};
+      border-radius: 4px;
+      transition: outline-color 0.15s ease;
+      animation: impeccable-reveal 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
+      animation-play-state: paused;
+      border-top-left-radius: 0;
+    }
+    .impeccable-overlay.impeccable-visible {
+      animation-play-state: running;
+    }
+    .impeccable-overlay.impeccable-hover {
+      outline-color: ${BRAND_COLOR_HOVER};
+      z-index: 100001 !important;
+    }
+    .impeccable-overlay.impeccable-hover .impeccable-label {
+      background: ${BRAND_COLOR_HOVER};
+    }
+    .impeccable-overlay.impeccable-spotlight {
+      z-index: 100002 !important;
+    }
+    .impeccable-overlay.impeccable-spotlight-dimmed {
+      opacity: 0.15 !important;
+      animation: none !important;
+      filter: blur(3px);
+    }
+    .impeccable-spotlight-backdrop {
+      position: fixed;
+      top: 0; left: 0; right: 0; bottom: 0;
+      backdrop-filter: blur(3px) brightness(0.6);
+      -webkit-backdrop-filter: blur(3px) brightness(0.6);
+      pointer-events: none;
+      z-index: 99998;
+      opacity: 0;
+      outline: none !important;
+      animation: none !important;
+    }
+    .impeccable-spotlight-backdrop.impeccable-visible {
+      opacity: 1;
+    }
+    .impeccable-hidden .impeccable-overlay${EXTENSION_MODE ? '' : ':not(.impeccable-banner)'} {
+      display: none !important;
+    }
+  `;
+  (document.head || document.documentElement).appendChild(styleEl);
+
+  // Spotlight backdrop element (created lazily on first use)
+  let spotlightBackdrop = null;
+  let spotlightTarget = null;
+
+  function getSpotlightBackdrop() {
+    if (!spotlightBackdrop) {
+      spotlightBackdrop = document.createElement('div');
+      spotlightBackdrop.className = 'impeccable-spotlight-backdrop';
+      document.body.appendChild(spotlightBackdrop);
+    }
+    return spotlightBackdrop;
+  }
+
+  function updateSpotlightClipPath() {
+    if (!spotlightBackdrop || !spotlightTarget) return;
+    const r = spotlightTarget.getBoundingClientRect();
+    // Match the overlay's outer edge: element rect + 4px (2px overlay offset + 2px outline width)
+    const inset = 4;
+    const radius = 6; // outline border-radius (4) + outline width (2)
+    const x1 = r.left - inset;
+    const y1 = r.top - inset;
+    const x2 = r.right + inset;
+    const y2 = r.bottom + inset;
+    const vw = window.innerWidth;
+    const vh = window.innerHeight;
+    // Outer rect + rounded inner rect (evenodd creates a hole)
+    const path = `M0 0H${vw}V${vh}H0Z M${x1 + radius} ${y1}H${x2 - radius}A${radius} ${radius} 0 0 1 ${x2} ${y1 + radius}V${y2 - radius}A${radius} ${radius} 0 0 1 ${x2 - radius} ${y2}H${x1 + radius}A${radius} ${radius} 0 0 1 ${x1} ${y2 - radius}V${y1 + radius}A${radius} ${radius} 0 0 1 ${x1 + radius} ${y1}Z`;
+    spotlightBackdrop.style.clipPath = `path(evenodd, "${path}")`;
+  }
+
+  function showSpotlight(target) {
+    if (!target || !target.getBoundingClientRect) return;
+    // Respect the spotlightBlur setting: if disabled, don't show the backdrop
+    if (window.__IMPECCABLE_CONFIG__?.spotlightBlur === false) {
+      spotlightTarget = target;
+      return;
+    }
+    spotlightTarget = target;
+    const bd = getSpotlightBackdrop();
+    updateSpotlightClipPath();
+    bd.classList.add('impeccable-visible');
+  }
+
+  function hideSpotlight() {
+    spotlightTarget = null;
+    if (spotlightBackdrop) spotlightBackdrop.classList.remove('impeccable-visible');
+  }
+
+  function isInViewport(el) {
+    const r = el.getBoundingClientRect();
+    return r.top >= 0 && r.left >= 0 && r.bottom <= window.innerHeight && r.right <= window.innerWidth;
+  }
+
+  // Reposition spotlight on scroll/resize
+  window.addEventListener('scroll', () => {
+    if (spotlightTarget) updateSpotlightClipPath();
+  }, { passive: true });
+  window.addEventListener('resize', () => {
+    if (spotlightTarget) updateSpotlightClipPath();
+  });
+
+  const overlays = [];
+  const TYPE_LABELS = {};
+  const RULE_CATEGORY = {};
+  for (const ap of ANTIPATTERNS) {
+    TYPE_LABELS[ap.id] = ap.name.toLowerCase();
+    RULE_CATEGORY[ap.id] = ap.category || 'quality';
+  }
+
+  function isInFixedContext(el) {
+    let p = el;
+    while (p && p !== document.body) {
+      if (getComputedStyle(p).position === 'fixed') return true;
+      p = p.parentElement;
+    }
+    return false;
+  }
+
+  function positionOverlay(overlay) {
+    const el = overlay._targetEl;
+    if (!el) return;
+    const rect = el.getBoundingClientRect();
+    if (overlay._isFixed) {
+      // Viewport-relative coords for fixed targets
+      overlay.style.top = `${rect.top - 2}px`;
+      overlay.style.left = `${rect.left - 2}px`;
+    } else {
+      // Document-relative coords for normal targets
+      overlay.style.top = `${rect.top + scrollY - 2}px`;
+      overlay.style.left = `${rect.left + scrollX - 2}px`;
+    }
+    overlay.style.width = `${rect.width + 4}px`;
+    overlay.style.height = `${rect.height + 4}px`;
+  }
+
+  function repositionOverlays() {
+    for (const o of overlays) {
+      if (!o._targetEl || o.classList.contains('impeccable-banner')) continue;
+      // Skip overlays whose target is currently hidden (display: none on the overlay)
+      if (o.style.display === 'none') continue;
+      positionOverlay(o);
+    }
+  }
+
+  let resizeRAF;
+  const onResize = () => {
+    cancelAnimationFrame(resizeRAF);
+    resizeRAF = requestAnimationFrame(repositionOverlays);
+  };
+  window.addEventListener('resize', onResize);
+  // Reposition on scroll too -- catches sticky/parallax shifts
+  window.addEventListener('scroll', onResize, { passive: true });
+  // Reposition when body resizes (lazy-loaded images, dynamic content, fonts loading)
+  if (typeof ResizeObserver !== 'undefined') {
+    const bodyResizeObserver = new ResizeObserver(onResize);
+    bodyResizeObserver.observe(document.body);
+  }
+
+  // Track target element visibility via IntersectionObserver.
+  // Uses a huge rootMargin so all *rendered* elements count as intersecting,
+  // while display:none / closed <details> / hidden modals etc. do not.
+  // This is event-driven -- no polling needed.
+  let overlayIndex = 0;
+  const visibilityObserver = new IntersectionObserver((entries) => {
+    for (const entry of entries) {
+      const overlay = entry.target._impeccableOverlay;
+      if (!overlay) continue;
+      if (entry.isIntersecting) {
+        overlay.style.display = '';
+        positionOverlay(overlay);
+        if (!overlay._revealed) {
+          overlay._revealed = true;
+          if (firstScanDone) {
+            // Subsequent reveals (re-scans, scroll-into-view): instant, no animation
+            overlay.style.animation = 'none';
+          } else {
+            // Initial scan: staggered cascade reveal
+            overlay.style.animationDelay = `${Math.min((overlay._staggerIndex || 0) * 60, 600)}ms`;
+          }
+          requestAnimationFrame(() => {
+            overlay.classList.add('impeccable-visible');
+            if (overlay._checkLabel) overlay._checkLabel();
+          });
+        }
+      } else {
+        overlay.style.display = 'none';
+      }
+    }
+  }, { rootMargin: '99999px' });
+
+  function detachOverlay(overlay) {
+    if (!overlay) return;
+    if (typeof overlay._cleanup === 'function') {
+      try { overlay._cleanup(); } catch { /* best effort overlay teardown */ }
+    }
+    if (overlay._targetEl && overlay._targetEl._impeccableOverlay === overlay) {
+      visibilityObserver.unobserve(overlay._targetEl);
+      delete overlay._targetEl._impeccableOverlay;
+    }
+    const idx = overlays.indexOf(overlay);
+    if (idx >= 0) overlays.splice(idx, 1);
+    overlay.remove();
+  }
+
+  // Reposition overlays after CSS transitions end (e.g. reveal animations).
+  // Listens at document level so it catches transitions on ancestor elements
+  // (the transform may be on a parent, not the flagged element itself).
+  document.addEventListener('transitionend', (e) => {
+    if (e.propertyName !== 'transform') return;
+    for (const o of overlays) {
+      if (!o._targetEl || o.classList.contains('impeccable-banner') || o.style.display === 'none') continue;
+      if (e.target === o._targetEl || e.target.contains(o._targetEl)) {
+        positionOverlay(o);
+      }
+    }
+  });
+
+  const highlight = function(el, findings) {
+    if (el._impeccableOverlay) detachOverlay(el._impeccableOverlay);
+    const hasSlop = findings.some(f => RULE_CATEGORY[f.type || f.id] === 'slop');
+
+    const fixed = isInFixedContext(el);
+    const rect = el.getBoundingClientRect();
+    const outline = document.createElement('div');
+    outline.className = 'impeccable-overlay';
+    outline._targetEl = el;
+    outline._isFixed = fixed;
+    Object.assign(outline.style, {
+      position: fixed ? 'fixed' : 'absolute',
+      top: fixed ? `${rect.top - 2}px` : `${rect.top + scrollY - 2}px`,
+      left: fixed ? `${rect.left - 2}px` : `${rect.left + scrollX - 2}px`,
+      width: `${rect.width + 4}px`, height: `${rect.height + 4}px`,
+      zIndex: '99999', boxSizing: 'border-box',
+    });
+
+    // Build per-finding label entries: ✦ prefix for slop
+    const entries = findings.map(f => {
+      const name = TYPE_LABELS[f.type || f.id] || f.type || f.id;
+      const prefix = RULE_CATEGORY[f.type || f.id] === 'slop' ? '\u2726 ' : '';
+      return { name: prefix + name, detail: f.detail || f.snippet };
+    });
+    const allText = entries.map(e => e.name).join(', ');
+
+    const label = document.createElement('div');
+    label.className = 'impeccable-label';
+    Object.assign(label.style, {
+      position: 'absolute', bottom: '100%', left: '-2px',
+      display: 'flex', alignItems: 'center',
+      whiteSpace: 'nowrap',
+      fontSize: '11px', fontWeight: '600', letterSpacing: '0.02em',
+      color: LABEL_INK, lineHeight: '14px',
+      background: LABEL_BG,
+      fontFamily: 'system-ui, sans-serif',
+      borderRadius: '4px 4px 0 0',
+    });
+
+    const textSpan = document.createElement('span');
+    textSpan.style.padding = '3px 8px';
+    textSpan.textContent = allText;
+    label.appendChild(textSpan);
+
+    // State for cycling mode
+    let cycleMode = false;
+    let cycleIndex = 0;
+    let isHovered = false;
+    let prevBtn, nextBtn;
+
+    function updateCycleText() {
+      const e = entries[cycleIndex];
+      textSpan.textContent = isHovered ? e.detail : e.name;
+    }
+
+    function enableCycleMode() {
+      if (cycleMode || entries.length < 2) return;
+      cycleMode = true;
+
+      const btnStyle = {
+        background: 'none', border: 'none', color: 'rgba(255,255,255,0.7)',
+        fontSize: '11px', cursor: 'pointer', padding: '3px 4px',
+        fontFamily: 'system-ui, sans-serif', lineHeight: '14px',
+        pointerEvents: 'auto',
+      };
+
+      const navGroup = document.createElement('span');
+      Object.assign(navGroup.style, {
+        display: 'inline-flex', alignItems: 'center', flexShrink: '0',
+      });
+
+      prevBtn = document.createElement('button');
+      prevBtn.textContent = '\u2039';
+      Object.assign(prevBtn.style, btnStyle);
+      prevBtn.style.paddingLeft = '6px';
+      prevBtn.addEventListener('click', (e) => {
+        e.stopPropagation();
+        cycleIndex = (cycleIndex - 1 + entries.length) % entries.length;
+        updateCycleText();
+      });
+
+      nextBtn = document.createElement('button');
+      nextBtn.textContent = '\u203A';
+      Object.assign(nextBtn.style, btnStyle);
+      nextBtn.style.paddingRight = '2px';
+      nextBtn.addEventListener('click', (e) => {
+        e.stopPropagation();
+        cycleIndex = (cycleIndex + 1) % entries.length;
+        updateCycleText();
+      });
+
+      navGroup.appendChild(prevBtn);
+      navGroup.appendChild(nextBtn);
+      label.insertBefore(navGroup, textSpan);
+      textSpan.style.padding = '3px 8px 3px 4px';
+      updateCycleText();
+    }
+
+    outline.appendChild(label);
+
+    // Start hidden; the IntersectionObserver will show it once the target is rendered
+    outline.style.display = 'none';
+    outline._staggerIndex = overlayIndex++;
+    el._impeccableOverlay = outline;
+    visibilityObserver.observe(el);
+
+    // After first paint, check label width vs outline
+    outline._checkLabel = () => {
+      if (entries.length > 1 && label.offsetWidth > outline.offsetWidth) {
+        enableCycleMode();
+      }
+    };
+
+    // Hover: show detail text, darken
+    const onMouseEnter = () => {
+      isHovered = true;
+      outline.classList.add('impeccable-hover');
+      outline.style.outlineColor = BRAND_COLOR_HOVER;
+      label.style.background = BRAND_COLOR_HOVER;
+      if (cycleMode) {
+        updateCycleText();
+      } else {
+        textSpan.textContent = entries.map(e => e.detail).join(' | ');
+      }
+    };
+    const onMouseLeave = () => {
+      isHovered = false;
+      outline.classList.remove('impeccable-hover');
+      outline.style.outlineColor = '';
+      label.style.background = LABEL_BG;
+      if (cycleMode) {
+        updateCycleText();
+      } else {
+        textSpan.textContent = allText;
+      }
+    };
+    el.addEventListener('mouseenter', onMouseEnter);
+    el.addEventListener('mouseleave', onMouseLeave);
+    outline._cleanup = () => {
+      el.removeEventListener('mouseenter', onMouseEnter);
+      el.removeEventListener('mouseleave', onMouseLeave);
+    };
+
+    document.body.appendChild(outline);
+    overlays.push(outline);
+  };
+
+  const showPageBanner = function(findings) {
+    if (!findings.length) return;
+    const banner = document.createElement('div');
+    banner.className = 'impeccable-overlay impeccable-banner';
+    Object.assign(banner.style, {
+      position: 'fixed', top: '0', left: '0', right: '0', zIndex: '100000',
+      background: LABEL_BG, color: LABEL_INK,
+      fontFamily: 'system-ui, sans-serif', fontSize: '13px',
+      display: 'flex', alignItems: 'center', pointerEvents: 'auto',
+      height: '36px', overflow: 'hidden', maxWidth: '100vw',
+      transform: 'translateY(-100%)',
+      transition: 'transform 0.4s cubic-bezier(0.16, 1, 0.3, 1)',
+    });
+    requestAnimationFrame(() => requestAnimationFrame(() => {
+      banner.style.transform = 'translateY(0)';
+    }));
+
+    // Scrollable findings area
+    const scrollArea = document.createElement('div');
+    Object.assign(scrollArea.style, {
+      flex: '1', minWidth: '0', overflowX: 'auto', overflowY: 'hidden',
+      display: 'flex', gap: '8px', alignItems: 'center',
+      padding: '0 12px', scrollSnapType: 'x mandatory',
+      scrollbarWidth: 'none',
+    });
+    for (const f of findings) {
+      const prefix = RULE_CATEGORY[f.type] === 'slop' ? '\u2726 ' : '';
+      const tag = document.createElement('span');
+      tag.textContent = `${prefix}${TYPE_LABELS[f.type] || f.type}: ${f.detail}`;
+      Object.assign(tag.style, {
+        background: 'rgba(255,255,255,0.15)', padding: '2px 8px',
+        borderRadius: '3px', fontSize: '12px', fontFamily: 'ui-monospace, monospace',
+        whiteSpace: 'nowrap', flexShrink: '0', scrollSnapAlign: 'start',
+      });
+      scrollArea.appendChild(tag);
+    }
+    banner.appendChild(scrollArea);
+
+    // Controls area (only in standalone mode, not extension)
+    if (!EXTENSION_MODE) {
+      const controls = document.createElement('div');
+      Object.assign(controls.style, {
+        display: 'flex', alignItems: 'center', gap: '2px',
+        padding: '0 8px', flexShrink: '0',
+      });
+
+      // Toggle visibility button
+      const toggle = document.createElement('button');
+      toggle.textContent = '\u25C9'; // circle with dot (visible state)
+      toggle.title = 'Toggle overlay visibility';
+      Object.assign(toggle.style, {
+        background: 'none', border: 'none',
+        color: 'white', fontSize: '16px', cursor: 'pointer', padding: '0 4px',
+        opacity: '0.85', transition: 'opacity 0.15s',
+      });
+      let overlaysVisible = true;
+      toggle.addEventListener('click', () => {
+        overlaysVisible = !overlaysVisible;
+        document.body.classList.toggle('impeccable-hidden', !overlaysVisible);
+        toggle.textContent = overlaysVisible ? '\u25C9' : '\u25CB'; // filled vs empty circle
+        toggle.style.opacity = overlaysVisible ? '0.85' : '0.5';
+      });
+      controls.appendChild(toggle);
+
+      // Close button
+      const close = document.createElement('button');
+      close.textContent = '\u00d7';
+      close.title = 'Dismiss banner';
+      Object.assign(close.style, {
+        background: 'none', border: 'none',
+        color: 'white', fontSize: '18px', cursor: 'pointer', padding: '0 4px',
+      });
+      close.addEventListener('click', () => banner.remove());
+      controls.appendChild(close);
+
+      banner.appendChild(controls);
+    }
+    document.body.appendChild(banner);
+    overlays.push(banner);
+  };
+
+  // Heuristic for skipping CSS-in-JS hashed class names like "css-1a2b3c" or "_2x4hG_".
+  // These change between builds and produce brittle, ugly selectors.
+  function isLikelyHashedClass(c) {
+    if (!c) return true;
+    if (/^(css|sc|emotion|jsx|module)-[\w-]{4,}$/i.test(c)) return true;
+    if (/^_[\w-]{5,}$/.test(c)) return true;
+    if (/^[a-z0-9]{6,}$/i.test(c) && /\d/.test(c)) return true;
+    return false;
+  }
+
+  function buildSelectorSegment(el) {
+    const tag = el.tagName.toLowerCase();
+    let sel = tag;
+
+    if (el.classList && el.classList.length > 0) {
+      const classes = [...el.classList]
+        .filter(c => !c.startsWith('impeccable-') && !isLikelyHashedClass(c))
+        .slice(0, 2);
+      if (classes.length > 0) {
+        sel += '.' + classes.map(c => CSS.escape(c)).join('.');
+      }
+    }
+
+    // Disambiguate among siblings only if the parent has multiple matches
+    const parent = el.parentElement;
+    if (parent) {
+      try {
+        const matching = parent.querySelectorAll(':scope > ' + sel);
+        if (matching.length > 1) {
+          const sameType = [...parent.children].filter(c => c.tagName === el.tagName);
+          const idx = sameType.indexOf(el) + 1;
+          sel += `:nth-of-type(${idx})`;
+        }
+      } catch {
+        const idx = [...parent.children].indexOf(el) + 1;
+        sel = `${tag}:nth-child(${idx})`;
+      }
+    }
+    return sel;
+  }
+
+  function generateSelector(el) {
+    if (el === document.body) return 'body';
+    if (el === document.documentElement) return 'html';
+    if (el.id) return '#' + CSS.escape(el.id);
+
+    const parts = [];
+    let current = el;
+    let depth = 0;
+    const MAX_DEPTH = 10;
+
+    while (current && current !== document.body && current !== document.documentElement && depth < MAX_DEPTH) {
+      parts.unshift(buildSelectorSegment(current));
+
+      // Anchor on an ancestor's ID and stop walking up
+      if (current.id) {
+        parts[0] = '#' + CSS.escape(current.id);
+        break;
+      }
+
+      // Stop as soon as the partial selector uniquely identifies the target
+      const trySelector = parts.join(' > ');
+      try {
+        const matches = document.querySelectorAll(trySelector);
+        if (matches.length === 1 && matches[0] === el) {
+          return trySelector;
+        }
+      } catch { /* invalid selector — keep walking */ }
+
+      current = current.parentElement;
+      depth++;
+    }
+
+    return parts.join(' > ');
+  }
+
+  function getDirectText(el) {
+    return [...el.childNodes]
+      .filter(n => n.nodeType === 3)
+      .map(n => n.textContent || '')
+      .join('');
+  }
+
+  function getDirectTextRect(el) {
+    const rects = [];
+    for (const node of el.childNodes) {
+      if (node.nodeType !== 3 || !(node.textContent || '').trim()) continue;
+      const range = document.createRange();
+      range.selectNodeContents(node);
+      for (const rect of range.getClientRects()) {
+        if (rect.width >= 1 && rect.height >= 1) rects.push(rect);
+      }
+      range.detach?.();
+    }
+    if (rects.length === 0) return null;
+    const left = Math.min(...rects.map(r => r.left));
+    const top = Math.min(...rects.map(r => r.top));
+    const right = Math.max(...rects.map(r => r.right));
+    const bottom = Math.max(...rects.map(r => r.bottom));
+    return {
+      left,
+      top,
+      right,
+      bottom,
+      width: right - left,
+      height: bottom - top,
+      x: left,
+      y: top,
+    };
+  }
+
+  function collectVisualContrastReasons(el, style) {
+    const reasons = new Set();
+    const bgClip = style.webkitBackgroundClip || style.backgroundClip || '';
+    const ownBgImage = style.backgroundImage || '';
+    if (bgClip === 'text' && ownBgImage && ownBgImage !== 'none') {
+      reasons.add('background-clip text');
+    }
+    if (style.textShadow && style.textShadow !== 'none') reasons.add('text shadow');
+
+    let current = el;
+    while (current && current.nodeType === 1) {
+      const tag = current.tagName?.toLowerCase();
+      const currentStyle = getComputedStyle(current);
+      const bgImage = currentStyle.backgroundImage || '';
+      const isDocumentSurface = tag === 'body' || tag === 'html';
+
+      if (!isDocumentSurface && bgImage && bgImage !== 'none') {
+        if (/url\s*\(/i.test(bgImage)) reasons.add('image background');
+        if (/gradient/i.test(bgImage)) reasons.add('gradient background');
+      }
+      if (parseFloat(currentStyle.opacity) < 0.99) reasons.add('opacity stack');
+      if (currentStyle.mixBlendMode && currentStyle.mixBlendMode !== 'normal') reasons.add('blend mode');
+      if (currentStyle.filter && currentStyle.filter !== 'none') reasons.add('filter');
+      if (currentStyle.backdropFilter && currentStyle.backdropFilter !== 'none') reasons.add('backdrop filter');
+
+      const solidBg = parseRgb(currentStyle.backgroundColor);
+      if (solidBg && solidBg.a >= 0.95 && (!bgImage || bgImage === 'none')) break;
+      current = current.parentElement;
+    }
+
+    const sampleRect = getDirectTextRect(el) || el.getBoundingClientRect();
+    if (sampleRect && document.elementsFromPoint) {
+      const points = [
+        [sampleRect.left + sampleRect.width / 2, sampleRect.top + sampleRect.height / 2],
+        [sampleRect.left + Math.min(sampleRect.width - 1, Math.max(1, sampleRect.width * 0.25)), sampleRect.top + sampleRect.height / 2],
+        [sampleRect.left + Math.min(sampleRect.width - 1, Math.max(1, sampleRect.width * 0.75)), sampleRect.top + sampleRect.height / 2],
+      ];
+      for (const [x, y] of points) {
+        if (x < 0 || y < 0 || x > window.innerWidth || y > window.innerHeight) continue;
+        const stack = document.elementsFromPoint(x, y);
+        const selfIndex = stack.findIndex(node => node === el || el.contains(node) || node.contains?.(el));
+        if (selfIndex < 0) continue;
+        for (const node of stack.slice(selfIndex + 1)) {
+          const nodeTag = node.tagName?.toLowerCase();
+          if (nodeTag === 'img' || nodeTag === 'picture' || nodeTag === 'video' || nodeTag === 'canvas' || nodeTag === 'svg') {
+            reasons.add(`${nodeTag} underlay`);
+            break;
+          }
+        }
+      }
+    }
+
+    return [...reasons];
+  }
+
+  function collectVisualContrastCandidates(options = {}) {
+    const maxCandidates = Number.isFinite(options.maxCandidates) ? options.maxCandidates : 12;
+    const candidates = [];
+    for (const el of document.querySelectorAll('*')) {
+      if (candidates.length >= maxCandidates) break;
+      if (el.closest('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
+      if (el.closest('[id^="impeccable-live-"]')) continue;
+      if (el === document.body || el === document.documentElement) continue;
+      if (!isRenderedForBrowserRule(el)) continue;
+
+      const tag = el.tagName.toLowerCase();
+      const style = getComputedStyle(el);
+      if (style.display === 'none' || style.visibility === 'hidden') continue;
+      const directText = getDirectText(el);
+      const hasDirectText = directText.trim().length > 0;
+      if (!hasDirectText || isEmojiOnlyText(directText)) continue;
+
+      const bgColor = readOwnBackgroundColor(el, style);
+      const isStyledButton = (tag === 'a' || tag === 'button')
+        && bgColor && bgColor.a > 0.5;
+      if (SAFE_TAGS.has(tag) && !isStyledButton) continue;
+
+      const rect = getDirectTextRect(el) || el.getBoundingClientRect();
+      if (!rect || rect.width < 4 || rect.height < 4) continue;
+
+      const reasons = collectVisualContrastReasons(el, style);
+      if (reasons.length === 0) continue;
+
+      const textColor = parseRgb(style.color);
+      const fontSize = parseFloat(style.fontSize) || 16;
+      const fontWeight = parseInt(style.fontWeight) || 400;
+      const isLargeText = fontSize >= WCAG_LARGE_TEXT_PX || (fontSize >= WCAG_LARGE_BOLD_TEXT_PX && fontWeight >= 700);
+      const threshold = isLargeText ? 3.0 : 4.5;
+      const clip = {
+        x: Math.max(0, Math.floor(rect.left + window.scrollX - 2)),
+        y: Math.max(0, Math.floor(rect.top + window.scrollY - 2)),
+        width: Math.max(1, Math.ceil(rect.width + 4)),
+        height: Math.max(1, Math.ceil(rect.height + 4)),
+      };
+
+      candidates.push({
+        selector: generateSelector(el),
+        tagName: tag,
+        text: directText.trim().replace(/\s+/g, ' ').slice(0, 80),
+        threshold,
+        reasons,
+        clip,
+        textColor,
+        preferRenderedForeground: !textColor || textColor.a < 0.99 || reasons.some(reason =>
+          reason === 'opacity stack' ||
+          reason === 'blend mode' ||
+          reason === 'filter' ||
+          reason === 'backdrop filter' ||
+          reason === 'background-clip text'
+        ),
+        backgroundClipText: reasons.includes('background-clip text'),
+      });
+    }
+    return candidates;
+  }
+
+  const visualContrastImageCache = new Map();
+  const visualContrastRasterCache = new WeakMap();
+
+  function clampByte(value) {
+    return Math.max(0, Math.min(255, Math.round(value)));
+  }
+
+  function blendRgba(fg, bg) {
+    if (!fg) return bg || null;
+    if (!bg || fg.a == null || fg.a >= 0.999) {
+      return { r: clampByte(fg.r), g: clampByte(fg.g), b: clampByte(fg.b), a: fg.a == null ? 1 : fg.a };
+    }
+    const alpha = Math.max(0, Math.min(1, fg.a));
+    return {
+      r: clampByte(fg.r * alpha + bg.r * (1 - alpha)),
+      g: clampByte(fg.g * alpha + bg.g * (1 - alpha)),
+      b: clampByte(fg.b * alpha + bg.b * (1 - alpha)),
+      a: 1,
+    };
+  }
+
+  function pickWorstContrastColor(textColor, colors) {
+    const usable = (colors || []).filter(Boolean);
+    if (!usable.length) return null;
+    let worst = usable[0];
+    let worstRatio = contrastRatio(textColor, worst);
+    for (const color of usable.slice(1)) {
+      const ratio = contrastRatio(textColor, color);
+      if (ratio < worstRatio) {
+        worst = color;
+        worstRatio = ratio;
+      }
+    }
+    return worst;
+  }
+
+  function firstCssUrl(value) {
+    const match = String(value || '').match(/url\((?:"([^"]+)"|'([^']+)'|([^)]*))\)/i);
+    if (!match) return '';
+    return (match[1] || match[2] || match[3] || '').trim();
+  }
+
+  function getLayerValue(value, index = 0) {
+    return String(value || '').split(',')[index]?.trim() || '';
+  }
+
+  function parsePositionToken(token, container, painted) {
+    if (!token || token === 'center') return (container - painted) / 2;
+    if (token === 'left' || token === 'top') return 0;
+    if (token === 'right' || token === 'bottom') return container - painted;
+    if (/%$/.test(token)) {
+      const pct = parseFloat(token) / 100;
+      return (container - painted) * pct;
+    }
+    if (/px$/.test(token)) return parseFloat(token) || 0;
+    return (container - painted) / 2;
+  }
+
+  function parsePositionPair(positionValue) {
+    const tokens = String(positionValue || '50% 50%').trim().split(/\s+/).filter(Boolean);
+    const first = tokens[0] || '50%';
+    if (tokens.length < 2) {
+      if (first === 'top' || first === 'bottom') return ['50%', first];
+      return [first, '50%'];
+    }
+    return [first, tokens[1] || '50%'];
+  }
+
+  function resolvePaintedImageRect(containerRect, image, sizeValue, positionValue) {
+    const intrinsicWidth = image.naturalWidth || image.videoWidth || image.width || 1;
+    const intrinsicHeight = image.naturalHeight || image.videoHeight || image.height || 1;
+    let paintedWidth = intrinsicWidth;
+    let paintedHeight = intrinsicHeight;
+    const size = String(sizeValue || 'auto').trim();
+
+    if (size === 'cover' || size === 'contain') {
+      const scale = size === 'cover'
+        ? Math.max(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight)
+        : Math.min(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight);
+      paintedWidth = intrinsicWidth * scale;
+      paintedHeight = intrinsicHeight * scale;
+    } else if (size && size !== 'auto') {
+      const parts = size.split(/\s+/);
+      const widthToken = parts[0];
+      const heightToken = parts[1] || 'auto';
+      if (/%$/.test(widthToken)) paintedWidth = containerRect.width * (parseFloat(widthToken) / 100);
+      else if (/px$/.test(widthToken)) paintedWidth = parseFloat(widthToken) || paintedWidth;
+      if (heightToken === 'auto') paintedHeight = paintedWidth * (intrinsicHeight / intrinsicWidth);
+      else if (/%$/.test(heightToken)) paintedHeight = containerRect.height * (parseFloat(heightToken) / 100);
+      else if (/px$/.test(heightToken)) paintedHeight = parseFloat(heightToken) || paintedHeight;
+    }
+
+    const [xToken, yToken] = parsePositionPair(positionValue);
+    const positionX = parsePositionToken(xToken, containerRect.width, paintedWidth);
+    const positionY = parsePositionToken(yToken, containerRect.height, paintedHeight);
+    return {
+      left: containerRect.left + positionX,
+      top: containerRect.top + positionY,
+      width: paintedWidth,
+      height: paintedHeight,
+      intrinsicWidth,
+      intrinsicHeight,
+    };
+  }
+
+  function parseObjectPosition(positionValue) {
+    return parsePositionPair(positionValue);
+  }
+
+  function resolveObjectImageRect(containerRect, image, style) {
+    const intrinsicWidth = image.naturalWidth || image.videoWidth || image.width || 1;
+    const intrinsicHeight = image.naturalHeight || image.videoHeight || image.height || 1;
+    const fit = style.objectFit || 'fill';
+    let paintedWidth = containerRect.width;
+    let paintedHeight = containerRect.height;
+    if (fit === 'contain' || fit === 'cover') {
+      const scale = fit === 'cover'
+        ? Math.max(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight)
+        : Math.min(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight);
+      paintedWidth = intrinsicWidth * scale;
+      paintedHeight = intrinsicHeight * scale;
+    } else if (fit === 'none') {
+      paintedWidth = intrinsicWidth;
+      paintedHeight = intrinsicHeight;
+    } else if (fit === 'scale-down') {
+      const containScale = Math.min(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight, 1);
+      paintedWidth = intrinsicWidth * containScale;
+      paintedHeight = intrinsicHeight * containScale;
+    }
+    const [xToken, yToken] = parseObjectPosition(style.objectPosition);
+    return {
+      left: containerRect.left + parsePositionToken(xToken, containerRect.width, paintedWidth),
+      top: containerRect.top + parsePositionToken(yToken, containerRect.height, paintedHeight),
+      width: paintedWidth,
+      height: paintedHeight,
+      intrinsicWidth,
+      intrinsicHeight,
+    };
+  }
+
+  function pointToImageSource(point, paintedRect) {
+    if (
+      point.x < paintedRect.left ||
+      point.y < paintedRect.top ||
+      point.x > paintedRect.left + paintedRect.width ||
+      point.y > paintedRect.top + paintedRect.height
+    ) {
+      return null;
+    }
+    return {
+      x: Math.max(0, Math.min(paintedRect.intrinsicWidth - 1, ((point.x - paintedRect.left) / paintedRect.width) * paintedRect.intrinsicWidth)),
+      y: Math.max(0, Math.min(paintedRect.intrinsicHeight - 1, ((point.y - paintedRect.top) / paintedRect.height) * paintedRect.intrinsicHeight)),
+    };
+  }
+
+  async function loadVisualContrastImage(src) {
+    if (!src) return null;
+    if (visualContrastImageCache.has(src)) return visualContrastImageCache.get(src);
+    const promise = new Promise(resolve => {
+      const img = new Image();
+      let settled = false;
+      const finish = value => {
+        if (settled) return;
+        settled = true;
+        clearTimeout(timer);
+        resolve(value);
+      };
+      const timer = setTimeout(() => finish(null), 800);
+      try {
+        const absolute = new URL(src, location.href);
+        if (absolute.origin !== location.origin && absolute.protocol !== 'data:' && absolute.protocol !== 'blob:') {
+          img.crossOrigin = 'anonymous';
+        }
+      } catch {
+        // Let the browser resolve unusual URLs itself.
+      }
+      img.onload = () => finish(img);
+      img.onerror = () => finish(null);
+      img.src = src;
+    });
+    visualContrastImageCache.set(src, promise);
+    return promise;
+  }
+
+  function sampleDrawablePixel(drawable, sourcePoint) {
+    if (visualContrastRasterCache.has(drawable)) {
+      const cached = visualContrastRasterCache.get(drawable);
+      if (!cached || !cached.ctx) return { status: 'unresolved', reason: cached?.reason || 'image sample failed' };
+      try {
+        const x = Math.max(0, Math.min(cached.width - 1, Math.floor(sourcePoint.x * cached.scaleX)));
+        const y = Math.max(0, Math.min(cached.height - 1, Math.floor(sourcePoint.y * cached.scaleY)));
+        const data = cached.ctx.getImageData(x, y, 1, 1).data;
+        return {
+          status: 'sampled',
+          color: { r: data[0], g: data[1], b: data[2], a: data[3] / 255 },
+        };
+      } catch (err) {
+        return {
+          status: 'unresolved',
+          reason: /taint|cross-origin|Security/i.test(err?.message || '') ? 'tainted image' : 'image sample failed',
+        };
+      }
+    }
+
+    const canvas = document.createElement('canvas');
+    const intrinsicWidth = drawable.naturalWidth || drawable.videoWidth || drawable.width || 1;
+    const intrinsicHeight = drawable.naturalHeight || drawable.videoHeight || drawable.height || 1;
+    const maxRasterSide = 640;
+    const scale = Math.min(1, maxRasterSide / Math.max(intrinsicWidth, intrinsicHeight));
+    canvas.width = Math.max(1, Math.round(intrinsicWidth * scale));
+    canvas.height = Math.max(1, Math.round(intrinsicHeight * scale));
+    const ctx = canvas.getContext('2d', { willReadFrequently: true });
+    if (!ctx) return { status: 'unresolved', reason: 'canvas unavailable' };
+    try {
+      ctx.drawImage(drawable, 0, 0, canvas.width, canvas.height);
+      const cached = {
+        ctx,
+        width: canvas.width,
+        height: canvas.height,
+        scaleX: canvas.width / intrinsicWidth,
+        scaleY: canvas.height / intrinsicHeight,
+      };
+      visualContrastRasterCache.set(drawable, cached);
+      const x = Math.max(0, Math.min(cached.width - 1, Math.floor(sourcePoint.x * cached.scaleX)));
+      const y = Math.max(0, Math.min(cached.height - 1, Math.floor(sourcePoint.y * cached.scaleY)));
+      const data = ctx.getImageData(x, y, 1, 1).data;
+      return {
+        status: 'sampled',
+        color: { r: data[0], g: data[1], b: data[2], a: data[3] / 255 },
+      };
+    } catch (err) {
+      const reason = /taint|cross-origin|Security/i.test(err?.message || '') ? 'tainted image' : 'image sample failed';
+      visualContrastRasterCache.set(drawable, { ctx: null, reason });
+      return {
+        status: 'unresolved',
+        reason,
+      };
+    }
+  }
+
+  async function sampleCssBackground(el, style, point, textColor) {
+    const rect = el.getBoundingClientRect();
+    const bgImage = style.backgroundImage || '';
+    if (bgImage && bgImage !== 'none') {
+      if (/gradient/i.test(bgImage)) {
+        const color = pickWorstContrastColor(textColor, parseGradientColors(bgImage));
+        if (color) return { status: 'sampled', color, method: 'analytic-gradient' };
+      }
+      if (/url\s*\(/i.test(bgImage)) {
+        const img = await loadVisualContrastImage(firstCssUrl(bgImage));
+        if (!img) return { status: 'unresolved', reason: 'image unavailable' };
+        const paintedRect = resolvePaintedImageRect(
+          rect,
+          img,
+          getLayerValue(style.backgroundSize) || 'auto',
+          getLayerValue(style.backgroundPosition) || '50% 50%',
+        );
+        const sourcePoint = pointToImageSource(point, paintedRect);
+        if (!sourcePoint) return { status: 'unresolved', reason: 'point outside background image' };
+        const sample = sampleDrawablePixel(img, sourcePoint);
+        if (sample.status === 'sampled') return { ...sample, method: 'canvas-background-image' };
+        return sample;
+      }
+    }
+    const bg = parseRgb(style.backgroundColor);
+    if (bg && bg.a > 0.05) return { status: 'sampled', color: bg, method: 'solid-background' };
+    return { status: 'unresolved', reason: 'no readable background' };
+  }
+
+  async function sampleImageElement(img, point) {
+    const rect = img.getBoundingClientRect();
+    const style = getComputedStyle(img);
+    const paintedRect = resolveObjectImageRect(rect, img, style);
+    const sourcePoint = pointToImageSource(point, paintedRect);
+    if (!sourcePoint) return { status: 'unresolved', reason: 'point outside image' };
+    const sample = sampleDrawablePixel(img, sourcePoint);
+    if (sample.status === 'sampled') return { ...sample, method: 'canvas-img-underlay' };
+
+    if (img.currentSrc || img.src) {
+      const loaded = await loadVisualContrastImage(img.currentSrc || img.src);
+      if (loaded) {
+        const loadedRect = { ...paintedRect, intrinsicWidth: loaded.naturalWidth || loaded.width || paintedRect.intrinsicWidth, intrinsicHeight: loaded.naturalHeight || loaded.height || paintedRect.intrinsicHeight };
+        const loadedPoint = pointToImageSource(point, loadedRect);
+        if (loadedPoint) {
+          const loadedSample = sampleDrawablePixel(loaded, loadedPoint);
+          if (loadedSample.status === 'sampled') return { ...loadedSample, method: 'canvas-img-underlay' };
+        }
+      }
+    }
+    return sample;
+  }
+
+  function textSamplePoints(rect) {
+    const insetX = Math.min(12, Math.max(1, rect.width * 0.12));
+    const insetY = Math.min(8, Math.max(1, rect.height * 0.22));
+    const xs = rect.width < 28
+      ? [rect.left + rect.width / 2]
+      : [rect.left + insetX, rect.left + rect.width / 2, rect.right - insetX];
+    const ys = rect.height < 22
+      ? [rect.top + rect.height / 2]
+      : [rect.top + insetY, rect.top + rect.height / 2, rect.bottom - insetY];
+    const points = [];
+    for (const y of ys) {
+      for (const x of xs) {
+        if (x >= 0 && y >= 0 && x <= window.innerWidth && y <= window.innerHeight) points.push({ x, y });
+      }
+    }
+    return points;
+  }
+
+  async function sampleVisualBackgroundAtPoint(el, point, textColor, depth = 0) {
+    if (depth > 8) {
+      return { status: 'unresolved', reason: 'background stack too deep' };
+    }
+    const stack = typeof document.elementsFromPoint === 'function'
+      ? document.elementsFromPoint(point.x, point.y)
+      : [];
+    const selfIndex = stack.findIndex(node => node === el || el.contains(node));
+    const nodes = selfIndex >= 0 ? stack.slice(selfIndex) : [el, ...stack];
+    const unresolved = [];
+
+    for (const node of nodes) {
+      if (!node || node.nodeType !== 1) continue;
+      if (node.closest?.('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
+      const tag = node.tagName?.toLowerCase();
+      if (tag === 'img') {
+        const sample = await sampleImageElement(node, point);
+        if (sample.status === 'sampled') return sample;
+        unresolved.push(sample.reason);
+        continue;
+      }
+      if (tag === 'canvas' || tag === 'video') {
+        const rect = node.getBoundingClientRect();
+        const sourcePoint = pointToImageSource(point, {
+          left: rect.left,
+          top: rect.top,
+          width: rect.width,
+          height: rect.height,
+          intrinsicWidth: node.width || node.videoWidth || rect.width,
+          intrinsicHeight: node.height || node.videoHeight || rect.height,
+        });
+        if (sourcePoint) {
+          const sample = sampleDrawablePixel(node, sourcePoint);
+          if (sample.status === 'sampled') return { ...sample, method: `canvas-${tag}-underlay` };
+          unresolved.push(sample.reason);
+        }
+        continue;
+      }
+      const style = getComputedStyle(node);
+      const sample = await sampleCssBackground(node, style, point, textColor);
+      if (sample.status === 'sampled') {
+        if (!sample.color || sample.color.a == null || sample.color.a >= 0.95) return sample;
+        const under = await sampleVisualBackgroundAtPoint(node.parentElement || document.body, point, textColor, depth + 1);
+        if (under.status === 'sampled') {
+          return {
+            status: 'sampled',
+            color: blendRgba(sample.color, under.color),
+            method: `${sample.method}+alpha`,
+          };
+        }
+        return sample;
+      }
+      unresolved.push(sample.reason);
+    }
+
+    return {
+      status: 'unresolved',
+      reason: [...new Set(unresolved.filter(Boolean))].slice(0, 3).join(', ') || 'no readable visual background',
+    };
+  }
+
+  async function analyzeVisualContrastCandidate(candidate) {
+    let el;
+    try {
+      el = document.querySelector(candidate.selector);
+    } catch {
+      return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'stale selector' };
+    }
+    if (!el) return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'missing element' };
+    if (!isRenderedForBrowserRule(el)) return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'hidden element' };
+
+    const blockingReason = (candidate.reasons || []).find(reason =>
+      reason === 'background-clip text' ||
+      reason === 'blend mode' ||
+      reason === 'filter' ||
+      reason === 'backdrop filter' ||
+      reason === 'opacity stack' ||
+      reason === 'text shadow'
+    );
+    if (blockingReason) {
+      return { ...candidate, status: 'unresolved', confidence: 'none', reason: `${blockingReason} needs screenshot pixels` };
+    }
+
+    const style = getComputedStyle(el);
+    const textColor = parseRgb(style.color) || candidate.textColor;
+    if (!textColor) return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'unreadable text color' };
+
+    const rect = getDirectTextRect(el) || el.getBoundingClientRect();
+    if (!rect || rect.width < 4 || rect.height < 4) {
+      return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'missing text rect' };
+    }
+
+    const points = textSamplePoints(rect);
+    if (points.length === 0) {
+      return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'text outside viewport' };
+    }
+
+    const ratios = [];
+    const methods = new Set();
+    const unresolved = [];
+    for (const point of points) {
+      const sample = await sampleVisualBackgroundAtPoint(el, point, textColor);
+      if (sample.status !== 'sampled' || !sample.color) {
+        unresolved.push(sample.reason);
+        continue;
+      }
+      const fg = blendRgba(textColor, sample.color);
+      ratios.push(contrastRatio(fg, sample.color));
+      if (sample.method) methods.add(sample.method);
+    }
+
+    if (ratios.length < Math.min(3, points.length)) {
+      return {
+        ...candidate,
+        status: 'unresolved',
+        confidence: 'none',
+        samples: ratios.length,
+        reason: [...new Set(unresolved.filter(Boolean))].slice(0, 3).join(', ') || 'not enough readable samples',
+      };
+    }
+
+    ratios.sort((a, b) => a - b);
+    const pick = pct => ratios[Math.min(ratios.length - 1, Math.max(0, Math.floor((pct / 100) * ratios.length)))];
+    const measuredRatio = pick(10);
+    const medianRatio = pick(50);
+    const status = measuredRatio < candidate.threshold ? 'fail' : 'pass';
+    const method = [...methods].sort().join(', ') || 'browser-visual';
+    const textLabel = candidate.text ? ` "${candidate.text}"` : '';
+    const detail = `browser contrast ${measuredRatio.toFixed(1)}:1 median ${medianRatio.toFixed(1)}:1 (need ${candidate.threshold}:1) via ${method}${textLabel}`;
+    return {
+      ...candidate,
+      status,
+      confidence: method.includes('canvas-') ? 'high' : 'medium',
+      method,
+      ratio: measuredRatio,
+      medianRatio,
+      samples: ratios.length,
+      finding: status === 'fail' ? { id: 'low-contrast', snippet: detail } : null,
+    };
+  }
+
+  function waitForVisualPaint() {
+    return new Promise(resolve => {
+      requestAnimationFrame(() => requestAnimationFrame(resolve));
+    });
+  }
+
+  async function analyzeVisualContrast(options = {}) {
+    const candidates = collectVisualContrastCandidates(options);
+    const results = [];
+    const shouldScrollOffscreen = options.scrollOffscreen === true;
+    const restoreScroll = { x: window.scrollX, y: window.scrollY };
+    for (const candidate of candidates) {
+      if (shouldScrollOffscreen && (window.scrollX !== restoreScroll.x || window.scrollY !== restoreScroll.y)) {
+        window.scrollTo(restoreScroll.x, restoreScroll.y);
+        await waitForVisualPaint();
+      }
+      let result = await analyzeVisualContrastCandidate(candidate);
+      if (shouldScrollOffscreen && result.status === 'unresolved' && result.reason === 'text outside viewport') {
+        let el = null;
+        try {
+          el = document.querySelector(candidate.selector);
+        } catch {
+          el = null;
+        }
+        if (el && typeof el.scrollIntoView === 'function') {
+          el.scrollIntoView({ block: 'center', inline: 'nearest', behavior: 'instant' });
+          await waitForVisualPaint();
+          result = await analyzeVisualContrastCandidate(candidate);
+        }
+      }
+      results.push(result);
+    }
+    if (shouldScrollOffscreen && (window.scrollX !== restoreScroll.x || window.scrollY !== restoreScroll.y)) {
+      window.scrollTo(restoreScroll.x, restoreScroll.y);
+    }
+    return results;
+  }
+
+  function isElementHidden(el) {
+    if (!el || el === document.body || el === document.documentElement) return false;
+    if (typeof el.checkVisibility === 'function') return !el.checkVisibility({ checkOpacity: false, checkVisibilityCSS: true });
+    // Fallback: zero size or no offsetParent (covers display:none and detached subtrees)
+    return el.offsetWidth === 0 && el.offsetHeight === 0;
+  }
+
+  function serializeFindings(allFindings) {
+    return allFindings.map(({ el, findings }) => ({
+      selector: generateSelector(el),
+      tagName: el.tagName?.toLowerCase() || 'unknown',
+      rect: (el !== document.body && el !== document.documentElement && el.getBoundingClientRect)
+        ? el.getBoundingClientRect().toJSON() : null,
+      isPageLevel: el === document.body || el === document.documentElement,
+      isHidden: isElementHidden(el),
+      findings: findings.map(f => {
+        const ap = ANTIPATTERNS.find(a => a.id === (f.type || f.id));
+        return {
+          type: f.type || f.id,
+          category: ap ? ap.category : 'quality',
+          severity: ap?.severity || 'warning',
+          detail: f.detail || f.snippet,
+          ignoreValue: f.ignoreValue || f.value || '',
+          name: ap ? ap.name : (f.type || f.id),
+          description: ap ? ap.description : '',
+        };
+      }),
+    }));
+  }
+
+  const printSummary = function(allFindings) {
+    if (allFindings.length === 0) {
+      console.log('%c[impeccable] No anti-patterns found.', 'color: #22c55e; font-weight: bold');
+      return;
+    }
+    console.group(
+      `%c[impeccable] ${allFindings.length} anti-pattern${allFindings.length === 1 ? '' : 's'} found`,
+      'color: oklch(84% 0.19 80.46); font-weight: bold'
+    );
+    for (const { el, findings } of allFindings) {
+      for (const f of findings) {
+        console.log(`%c${f.type || f.id}%c ${f.detail || f.snippet}`,
+          'color: oklch(84% 0.19 80.46); font-weight: bold', 'color: inherit', el);
+      }
+    }
+    console.groupEnd();
+  };
+
+  function addBrowserFindings(groupMap, el, findings) {
+    if (!findings || findings.length === 0) return;
+    const existing = groupMap.get(el);
+    if (existing) existing.push(...findings);
+    else groupMap.set(el, [...findings]);
+  }
+
+  function browserFindingsFromMap(groupMap) {
+    return [...groupMap.entries()].map(([el, findings]) => ({ el, findings }));
+  }
+
+  const DESIGN_COLOR_TOLERANCE = 6;
+  const DESIGN_RADIUS_TOLERANCE_PX = 0.5;
+  const DESIGN_SKIP_TAGS = new Set(['head', 'title', 'meta', 'link', 'style', 'script', 'noscript', 'template', 'source']);
+
+  function normalizeBrowserFontName(value) {
+    return String(value || '')
+      .trim()
+      .replace(/^["']|["']$/g, '')
+      .replace(/\+/g, ' ')
+      .replace(/\s+/g, ' ')
+      .toLowerCase();
+  }
+
+  function browserPrimaryFont(stack) {
+    if (!stack || /var\(/i.test(stack)) return '';
+    return String(stack || '')
+      .split(',')
+      .map(normalizeBrowserFontName)
+      .find(font => font && !GENERIC_FONTS.has(font)) || '';
+  }
+
+  function browserDesignSystemConfig() {
+    const raw = window.__IMPECCABLE_CONFIG__?.designSystem;
+    if (!raw?.present) return null;
+    const allowedFonts = new Set((raw.allowedFonts || []).map(normalizeBrowserFontName).filter(Boolean));
+    const allowedColors = (raw.allowedColors || [])
+      .filter(color => color && Number.isFinite(color.r) && Number.isFinite(color.g) && Number.isFinite(color.b))
+      .map(color => ({ r: color.r, g: color.g, b: color.b }));
+    const allowedRadii = (raw.allowedRadii || [])
+      .map(Number)
+      .filter(px => Number.isFinite(px));
+    return {
+      present: true,
+      hasFonts: raw.hasFonts === true && allowedFonts.size > 0,
+      allowedFonts,
+      hasColors: raw.hasColors === true && allowedColors.length > 0,
+      allowedColors,
+      hasRadii: raw.hasRadii === true && allowedRadii.length > 0,
+      allowedRadii,
+      hasPillRadius: raw.hasPillRadius === true,
+    };
+  }
+
+  function browserColorsClose(a, b) {
+    if (!a || !b) return false;
+    return Math.max(
+      Math.abs(a.r - b.r),
+      Math.abs(a.g - b.g),
+      Math.abs(a.b - b.b),
+    ) <= DESIGN_COLOR_TOLERANCE;
+  }
+
+  function isBrowserDesignColorAllowed(raw, designSystem) {
+    if (!designSystem?.hasColors) return true;
+    const text = String(raw || '').trim().toLowerCase();
+    if (!text || text === 'transparent' || text === 'currentcolor' || text === 'inherit' || text === 'initial') return true;
+    if (text.includes('var(')) return true;
+    const parsed = parseAnyColor(text);
+    if (!parsed) return true;
+    if ((parsed.a ?? 1) <= 0.05) return true;
+    return designSystem.allowedColors.some(color => browserColorsClose(parsed, color));
+  }
+
+  function isBrowserTransparentCss(value) {
+    const text = String(value || '').trim().toLowerCase();
+    if (!text || text === 'transparent') return true;
+    const parsed = parseAnyColor(text);
+    return parsed ? (parsed.a ?? 1) <= 0.05 : false;
+  }
+
+  function isBrowserDesignRadiusAllowed(raw, designSystem) {
+    if (!designSystem?.hasRadii) return true;
+    const text = String(raw || '').trim().toLowerCase();
+    if (!text || text === '0' || text === 'none' || text === 'initial' || text === 'inherit') return true;
+    if (text.includes('var(') || text.includes('%')) return true;
+    const px = resolveLengthPx(text, 16);
+    if (px == null || !Number.isFinite(px) || px <= DESIGN_RADIUS_TOLERANCE_PX) return true;
+    if (designSystem.hasPillRadius && px >= 99) return true;
+    return designSystem.allowedRadii.some(allowed => Math.abs(allowed - px) <= DESIGN_RADIUS_TOLERANCE_PX);
+  }
+
+  function browserRadiusTokens(value) {
+    return String(value || '')
+      .replace(/\s*\/\s*/g, ' ')
+      .split(/\s+/)
+      .map(token => token.trim())
+      .filter(Boolean);
+  }
+
+  function browserHasDirectText(el) {
+    return [...(el.childNodes || [])].some(node => node.nodeType === 3 && node.textContent.trim().length > 0);
+  }
+
+  function browserSampleText(el) {
+    const text = String(el.textContent || '').replace(/\s+/g, ' ').trim();
+    return text ? ` "${text.slice(0, 40)}"` : '';
+  }
+
+  function shouldSkipDesignElement(el) {
+    const tag = el.tagName?.toLowerCase?.() || '';
+    return DESIGN_SKIP_TAGS.has(tag) || isElementHidden(el);
+  }
+
+  function checkElementDesignSystemDOM(el, designSystem, seen) {
+    if (!designSystem?.present || shouldSkipDesignElement(el)) return [];
+    const findings = [];
+    const tag = el.tagName?.toLowerCase?.() || 'unknown';
+    const style = getComputedStyle(el);
+
+    if (designSystem.hasFonts && browserHasDirectText(el)) {
+      const font = browserPrimaryFont(style.fontFamily || '');
+      if (font && !designSystem.allowedFonts.has(font) && !seen.fonts.has(font)) {
+        seen.fonts.add(font);
+        findings.push({
+          type: 'design-system-font',
+          detail: `${tag}${browserSampleText(el)} uses ${font}; not declared in DESIGN.md typography`,
+          ignoreValue: font,
+        });
+      }
+    }
+
+    if (designSystem.hasColors) {
+      const colorChecks = [];
+      if (browserHasDirectText(el)) colorChecks.push(['text color', style.color]);
+      if (!isBrowserTransparentCss(style.backgroundColor)) colorChecks.push(['background', style.backgroundColor]);
+      for (const side of ['Top', 'Right', 'Bottom', 'Left']) {
+        if ((parseFloat(style[`border${side}Width`]) || 0) > 0) {
+          colorChecks.push([`border-${side.toLowerCase()}`, style[`border${side}Color`]]);
+        }
+      }
+      if ((parseFloat(style.outlineWidth) || 0) > 0) colorChecks.push(['outline', style.outlineColor]);
+
+      for (const [kind, raw] of colorChecks) {
+        const label = String(raw || '').trim().replace(/\s+/g, ' ');
+        if (isBrowserDesignColorAllowed(label, designSystem)) continue;
+        const key = `${kind}:${label}`;
+        if (seen.colors.has(key)) continue;
+        seen.colors.add(key);
+        findings.push({
+          type: 'design-system-color',
+          detail: `${kind} ${label} on ${tag}${browserSampleText(el)} is outside DESIGN.md colors`,
+          ignoreValue: label,
+        });
+      }
+    }
+
+    if (designSystem.hasRadii) {
+      for (const token of browserRadiusTokens(style.borderRadius || '')) {
+        if (isBrowserDesignRadiusAllowed(token, designSystem)) continue;
+        if (seen.radii.has(token)) continue;
+        seen.radii.add(token);
+        findings.push({
+          type: 'design-system-radius',
+          detail: `border-radius ${token} on ${tag}${browserSampleText(el)} is outside the DESIGN.md rounded scale`,
+          ignoreValue: token,
+        });
+      }
+    }
+
+    return findings;
+  }
+
+  function decodeBrowserGoogleFamily(value) {
+    const family = String(value || '').split(':')[0].replace(/\+/g, ' ');
+    try {
+      return decodeURIComponent(family);
+    } catch {
+      return family;
+    }
+  }
+
+  function checkBrowserDesignSystemSources(designSystem, seen) {
+    if (!designSystem?.hasFonts) return [];
+    const findings = [];
+    for (const link of document.querySelectorAll('link[href*="fonts.googleapis.com/css"]')) {
+      const href = link.getAttribute('href') || '';
+      for (const match of href.matchAll(/[?&]family=([^&]+)/g)) {
+        const display = decodeBrowserGoogleFamily(match[1]);
+        const font = normalizeBrowserFontName(display);
+        if (!font || designSystem.allowedFonts.has(font) || seen.fonts.has(font)) continue;
+        seen.fonts.add(font);
+        findings.push({
+          type: 'design-system-font',
+          detail: `Google Fonts: ${display} is not declared in DESIGN.md typography`,
+          ignoreValue: display,
+        });
+      }
+    }
+    return findings;
+  }
+
+  function collectBrowserFindings() {
+    const groupMap = new Map();
+    const _disabled = EXTENSION_MODE ? (window.__IMPECCABLE_CONFIG__?.disabledRules || []) : [];
+    const _ruleOk = (id) => !_disabled.length || !_disabled.includes(id);
+    const designSystem = browserDesignSystemConfig();
+    const designSeen = { fonts: new Set(), colors: new Set(), radii: new Set() };
+    // Note: provider-gated rules (--gpt / --gemini) are NOT filtered here. In a
+    // real browser env (detector page, live overlay, extension) running every
+    // check is free, so we always surface them; the gating is purely a CLI
+    // output concern, applied in the Node engines' detect* return paths.
+
+    for (const el of document.querySelectorAll('*')) {
+      // Skip impeccable's own elements and any descendants (overlays, labels, banner, nav buttons)
+      if (el.closest('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
+      // Skip browser extension elements (Claude, etc.)
+      const elId = el.id || '';
+      if (elId.startsWith('claude-') || elId.startsWith('cic-')) continue;
+      // Skip the impeccable live-mode overlay (highlight, tooltip, bar, picker, toast).
+      // These are inspector chrome, not part of the user's design.
+      if (el.closest('[id^="impeccable-live-"]')) continue;
+      // Skip html/body -- page-level findings go in the banner, not a full-page overlay
+      if (el === document.body || el === document.documentElement) continue;
+
+      const findings = [
+        ...checkElementBordersDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementColorsDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementMotionDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementGlowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementAIPaletteDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementIconTileDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementItalicSerifDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementQualityDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementOversizedH1DOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementClippedOverflowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementGptBorderShadowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementTextOverflowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementDesignSystemDOM(el, designSystem, designSeen),
+      ].filter(f => _ruleOk(f.type));
+
+      addBrowserFindings(groupMap, el, findings);
+
+      // Hero eyebrow: the offending element is the eyebrow above the heading,
+      // not the heading itself — highlight the previous sibling instead.
+      const eyebrowFindings = checkElementHeroEyebrowDOM(el)
+        .map(f => ({ type: f.id, detail: f.snippet }))
+        .filter(f => _ruleOk(f.type));
+      if (eyebrowFindings.length > 0 && el.previousElementSibling) {
+        addBrowserFindings(groupMap, el.previousElementSibling, eyebrowFindings);
+      }
+    }
+
+    const pageLevelFindings = [];
+
+    const designSourceFindings = checkBrowserDesignSystemSources(designSystem, designSeen)
+      .filter(f => _ruleOk(f.type));
+    if (designSourceFindings.length > 0) {
+      pageLevelFindings.push(...designSourceFindings);
+      addBrowserFindings(groupMap, document.body, designSourceFindings);
+    }
+
+    const typoFindings = checkTypography().filter(f => _ruleOk(f.type));
+    if (typoFindings.length > 0) {
+      pageLevelFindings.push(...typoFindings);
+      addBrowserFindings(groupMap, document.body, typoFindings);
+    }
+
+    const sectionKickerFindings = checkRepeatedSectionKickersDOM()
+      .map(f => ({ type: f.id, detail: f.snippet }))
+      .filter(f => _ruleOk(f.type));
+    if (sectionKickerFindings.length > 0) {
+      pageLevelFindings.push(...sectionKickerFindings);
+      addBrowserFindings(groupMap, document.body, sectionKickerFindings);
+    }
+
+    const layoutFindings = checkLayout().filter(f => _ruleOk(f.type));
+    for (const f of layoutFindings) {
+      const el = f.el || document.body;
+      addBrowserFindings(groupMap, el, [{ type: f.type, detail: f.detail || f.snippet }]);
+    }
+
+    // Page-level quality checks (headings, etc.)
+    const qualityFindings = checkPageQualityDOM().filter(f => _ruleOk(f.type));
+    if (qualityFindings.length > 0) {
+      pageLevelFindings.push(...qualityFindings);
+      addBrowserFindings(groupMap, document.body, qualityFindings);
+    }
+
+    const creamFindings = checkCreamPalette(document)
+      .map(f => ({ type: f.id, detail: f.snippet }))
+      .filter(f => _ruleOk(f.type));
+    if (creamFindings.length > 0) {
+      pageLevelFindings.push(...creamFindings);
+      addBrowserFindings(groupMap, document.body, creamFindings);
+    }
+
+    // Regex-on-HTML checks (shared with Node)
+    // Clone the document and strip impeccable-live overlay nodes before the
+    // regex scan, so the inspector's own inline styles (transitions on top/
+    // left/width/height, etc.) don't register as page anti-patterns.
+    const docClone = document.documentElement.cloneNode(true);
+    for (const node of docClone.querySelectorAll('[id^="impeccable-live-"]')) {
+      node.remove();
+    }
+    const htmlPatternFindings = checkHtmlPatterns(docClone.outerHTML);
+    if (htmlPatternFindings.length > 0) {
+      const mapped = htmlPatternFindings.map(f => ({ type: f.id, detail: f.snippet })).filter(f => _ruleOk(f.type));
+      pageLevelFindings.push(...mapped);
+      addBrowserFindings(groupMap, document.body, mapped);
+    }
+
+    return {
+      groupMap,
+      allFindings: browserFindingsFromMap(groupMap),
+      pageLevelFindings,
+    };
+  }
+
+  function shouldRunVisualContrast(options = {}) {
+    return options.visualContrast === true || window.__IMPECCABLE_CONFIG__?.visualContrast === true;
+  }
+
+  function visualContrastOptions(options = {}) {
+    const config = window.__IMPECCABLE_CONFIG__ || {};
+    const scrollOffscreen = typeof options.scrollOffscreen === 'boolean'
+      ? options.scrollOffscreen
+      : typeof options.visualContrastScrollOffscreen === 'boolean'
+        ? options.visualContrastScrollOffscreen
+        : typeof config.visualContrastScrollOffscreen === 'boolean'
+          ? config.visualContrastScrollOffscreen
+          : false;
+    return {
+      ...options,
+      maxCandidates: Number.isFinite(options.visualContrastMaxCandidates)
+        ? options.visualContrastMaxCandidates
+        : Number.isFinite(options.maxCandidates)
+          ? options.maxCandidates
+          : Number.isFinite(config.visualContrastMaxCandidates)
+            ? config.visualContrastMaxCandidates
+            : undefined,
+      scrollOffscreen,
+    };
+  }
+
+  let lastVisualContrastAnalyses = [];
+  let lazyVisualContrastObserver = null;
+  let lazyVisualContrastPending = new WeakMap();
+  const lazyVisualContrastResolving = new WeakSet();
+  let scanGeneration = 0;
+
+  function rememberVisualContrastAnalysis(result) {
+    if (!result?.selector) {
+      lastVisualContrastAnalyses.push(result);
+      return;
+    }
+    const idx = lastVisualContrastAnalyses.findIndex(item => item.selector === result.selector);
+    if (idx >= 0) lastVisualContrastAnalyses[idx] = result;
+    else lastVisualContrastAnalyses.push(result);
+  }
+
+  function disconnectLazyVisualContrastObserver() {
+    if (lazyVisualContrastObserver) {
+      lazyVisualContrastObserver.disconnect();
+      lazyVisualContrastObserver = null;
+    }
+    lazyVisualContrastPending = new WeakMap();
+  }
+
+  function addVisualContrastResult(groupMap, result, options = {}) {
+    if (result.status !== 'fail' || !result.finding || !result.selector) return false;
+    let el = null;
+    try {
+      el = document.querySelector(result.selector);
+    } catch {
+      el = null;
+    }
+    if (!el) return false;
+    const findingType = result.finding.type || result.finding.id || 'low-contrast';
+    const existing = groupMap.get(el) || [];
+    if (existing.some(f => (f.type || f.id) === findingType)) return false;
+    addBrowserFindings(groupMap, el, [{
+      type: findingType,
+      detail: result.finding.detail || result.finding.snippet,
+    }]);
+    if (options.decorate && el !== document.body && el !== document.documentElement) {
+      highlight(el, groupMap.get(el) || []);
+    }
+    return true;
+  }
+
+  function scanResultMeta(options = {}) {
+    const scanId = options.scanId;
+    if (typeof scanId !== 'string' && typeof scanId !== 'number') return {};
+    return { scanId: String(scanId) };
+  }
+
+  function postSerializedFindings(groupMap, options = {}) {
+    if (!EXTENSION_MODE) return;
+    const allFindings = browserFindingsFromMap(groupMap);
+    window.postMessage({
+      source: 'impeccable-results',
+      findings: serializeFindings(allFindings),
+      count: allFindings.length,
+      ...scanResultMeta(options),
+    }, '*');
+  }
+
+  function postExtensionError(err) {
+    if (!EXTENSION_MODE) return;
+    window.postMessage({
+      source: 'impeccable-error',
+      message: err?.message || String(err),
+    }, '*');
+  }
+
+  function reportVisualContrastError(err, detail = {}) {
+    window.dispatchEvent(new CustomEvent('impeccable-visual-contrast-error', {
+      detail: {
+        ...detail,
+        message: err?.message || String(err),
+      },
+    }));
+    if (EXTENSION_MODE) {
+      postExtensionError(err);
+    } else {
+      console.warn('[impeccable] visual contrast scan failed', err);
+    }
+  }
+
+  function scheduleLazyVisualContrast(groupMap, analyses, options = {}, runtime = {}) {
+    disconnectLazyVisualContrastObserver();
+    if (options.visualContrastLazy === false || options.scrollOffscreen !== false) return;
+    if (typeof IntersectionObserver === 'undefined') return;
+    const unresolved = (analyses || []).filter(result =>
+      result?.status === 'unresolved' &&
+      result.reason === 'text outside viewport' &&
+      result.selector
+    );
+    if (unresolved.length === 0) return;
+    const generation = runtime.generation || scanGeneration;
+
+    lazyVisualContrastObserver = new IntersectionObserver((entries) => {
+      for (const entry of entries) {
+        if (!entry.isIntersecting) continue;
+        const el = entry.target;
+        const candidate = lazyVisualContrastPending.get(el);
+        if (!candidate || lazyVisualContrastResolving.has(el)) continue;
+        lazyVisualContrastObserver?.unobserve(el);
+        lazyVisualContrastPending.delete(el);
+        lazyVisualContrastResolving.add(el);
+        waitForVisualPaint()
+          .then(() => analyzeVisualContrastCandidate(candidate))
+          .then(result => {
+            if (generation !== scanGeneration) return;
+            rememberVisualContrastAnalysis(result);
+            const added = addVisualContrastResult(groupMap, result, { decorate: true });
+            if (added) {
+              postSerializedFindings(groupMap, options);
+              window.dispatchEvent(new CustomEvent('impeccable-visual-contrast-resolved', {
+                detail: {
+                  selector: result.selector,
+                  status: result.status,
+                  finding: result.finding || null,
+                },
+              }));
+            }
+          })
+          .catch(err => {
+            reportVisualContrastError(err, { selector: candidate.selector });
+          })
+          .finally(() => {
+            lazyVisualContrastResolving.delete(el);
+          });
+      }
+    }, { threshold: 0.5 });
+
+    for (const candidate of unresolved) {
+      let el = null;
+      try {
+        el = document.querySelector(candidate.selector);
+      } catch {
+        el = null;
+      }
+      if (!el) continue;
+      lazyVisualContrastPending.set(el, candidate);
+      lazyVisualContrastObserver.observe(el);
+    }
+  }
+
+  async function addVisualContrastFindings(groupMap, options = {}, runtime = {}) {
+    if (!shouldRunVisualContrast(options)) {
+      lastVisualContrastAnalyses = [];
+      disconnectLazyVisualContrastObserver();
+      return [];
+    }
+    const resolvedOptions = visualContrastOptions(options);
+    const analyses = await analyzeVisualContrast(resolvedOptions);
+    if (runtime.generation && runtime.generation !== scanGeneration) return analyses;
+    lastVisualContrastAnalyses = analyses;
+    for (const result of analyses) {
+      addVisualContrastResult(groupMap, result, { decorate: runtime.decorate });
+    }
+    if (runtime.decorate || runtime.scheduleLazy) scheduleLazyVisualContrast(groupMap, analyses, resolvedOptions, runtime);
+    return analyses;
+  }
+
+  async function collectBrowserFindingsAsync(options = {}, runtime = {}) {
+    const collected = collectBrowserFindings();
+    await addVisualContrastFindings(collected.groupMap, options, runtime);
+    return {
+      ...collected,
+      allFindings: browserFindingsFromMap(collected.groupMap),
+      visualContrastAnalyses: lastVisualContrastAnalyses,
+    };
+  }
+
+  function clearOverlays() {
+    scanGeneration += 1;
+    disconnectLazyVisualContrastObserver();
+    for (const o of [...overlays]) detachOverlay(o);
+    overlays.length = 0;
+    visibilityObserver.disconnect();
+    overlayIndex = 0;
+  }
+
+  function renderBrowserFindings(collected, options = {}) {
+    const { allFindings, pageLevelFindings } = collected;
+
+    for (const { el, findings } of allFindings) {
+      if (el === document.body || el === document.documentElement) continue;
+      highlight(el, findings);
+    }
+
+    if (pageLevelFindings.length > 0) {
+      showPageBanner(pageLevelFindings);
+    }
+
+    if (!EXTENSION_MODE) printSummary(allFindings);
+
+    // In extension mode, post serialized results for the DevTools panel
+    if (EXTENSION_MODE) {
+      window.postMessage({
+        source: 'impeccable-results',
+        findings: serializeFindings(allFindings),
+        count: allFindings.length,
+        ...scanResultMeta(options),
+      }, '*');
+    }
+
+    // After this scan completes, all subsequent reveals are instant (no stagger, no animation)
+    setTimeout(() => { firstScanDone = true; }, 1000);
+
+    return allFindings;
+  }
+
+  let firstScanDone = false;
+  const scan = function(options = {}) {
+    clearOverlays();
+    const generation = scanGeneration;
+    const collected = collectBrowserFindings();
+    const allFindings = renderBrowserFindings(collected, options);
+    if (shouldRunVisualContrast(options)) {
+      addVisualContrastFindings(collected.groupMap, options, { decorate: true, generation })
+        .then(() => {
+          if (generation === scanGeneration) postSerializedFindings(collected.groupMap, options);
+        })
+        .catch(err => {
+          reportVisualContrastError(err);
+        });
+    }
+    return allFindings;
+  };
+
+  const scanAsync = async function(options = {}) {
+    clearOverlays();
+    const generation = scanGeneration;
+    if (shouldRunVisualContrast(options)) {
+      const collected = await collectBrowserFindingsAsync(options, { generation, scheduleLazy: true });
+      if (generation !== scanGeneration) return [];
+      return renderBrowserFindings(collected, options);
+    }
+    lastVisualContrastAnalyses = [];
+    return renderBrowserFindings(collectBrowserFindings(), options);
+  };
+
+  const detect = function(options = {}) {
+    lastVisualContrastAnalyses = [];
+    const { allFindings } = collectBrowserFindings();
+    return options.serialize === false ? allFindings : serializeFindings(allFindings);
+  };
+
+  const detectAsync = async function(options = {}) {
+    if (shouldRunVisualContrast(options)) {
+      const { allFindings } = await collectBrowserFindingsAsync(options);
+      return options.serialize === false ? allFindings : serializeFindings(allFindings);
+    }
+    lastVisualContrastAnalyses = [];
+    const { allFindings } = collectBrowserFindings();
+    return options.serialize === false ? allFindings : serializeFindings(allFindings);
+  };
+
+  if (EXTENSION_MODE) {
+    // Extension mode: listen for commands, don't auto-scan
+    window.addEventListener('message', (e) => {
+      if (e.source !== window || !e.data || e.data.source !== 'impeccable-command') return;
+      if (e.data.action === 'scan') {
+        if (e.data.config) window.__IMPECCABLE_CONFIG__ = e.data.config;
+        try {
+          scan(e.data.config || {});
+        } catch (err) {
+          postExtensionError(err);
+        }
+      }
+      if (e.data.action === 'toggle-overlays') {
+        const visible = !document.body.classList.contains('impeccable-hidden');
+        document.body.classList.toggle('impeccable-hidden', visible);
+        window.postMessage({ source: 'impeccable-overlays-toggled', visible: !visible }, '*');
+      }
+      if (e.data.action === 'remove') {
+        clearOverlays();
+        styleEl.remove();
+        if (spotlightBackdrop) { spotlightBackdrop.remove(); spotlightBackdrop = null; }
+        document.body.classList.remove('impeccable-hidden');
+      }
+      if (e.data.action === 'highlight') {
+        try {
+          const target = e.data.selector ? document.querySelector(e.data.selector) : null;
+          if (target) {
+            // Scroll first so positionOverlay reads the post-scroll rect
+            if (!isInViewport(target) && target.scrollIntoView) {
+              target.scrollIntoView({ behavior: 'instant', block: 'center' });
+            }
+            for (const o of overlays) {
+              if (o.classList.contains('impeccable-banner')) continue;
+              const isMatch = o._targetEl === target;
+              o.classList.toggle('impeccable-spotlight', isMatch);
+              o.classList.toggle('impeccable-spotlight-dimmed', !isMatch);
+              if (isMatch) {
+                // Force the matching overlay visible immediately, don't wait for IntersectionObserver
+                o.style.display = '';
+                o.style.animation = 'none';
+                o.classList.add('impeccable-visible');
+                o._revealed = true;
+                positionOverlay(o);
+              }
+            }
+            showSpotlight(target);
+          }
+        } catch { /* invalid selector */ }
+      }
+      if (e.data.action === 'unhighlight') {
+        hideSpotlight();
+        for (const o of overlays) {
+          o.classList.remove('impeccable-spotlight');
+          o.classList.remove('impeccable-spotlight-dimmed');
+        }
+      }
+    });
+    window.postMessage({ source: 'impeccable-ready' }, '*');
+  } else {
+    if (window.__IMPECCABLE_CONFIG__?.autoScan !== false) {
+      const runAutoScan = () => {
+        try {
+          scan();
+        } catch (err) {
+          console.warn('[impeccable] scan failed', err);
+        }
+      };
+      if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', () => setTimeout(runAutoScan, 100));
+      } else {
+        setTimeout(runAutoScan, 100);
+      }
+    }
+  }
+
+  window.impeccableDetect = detect;
+  window.impeccableDetectAsync = detectAsync;
+  window.impeccableScan = scan;
+  window.impeccableScanAsync = scanAsync;
+  window.impeccableCollectVisualContrastCandidates = collectVisualContrastCandidates;
+  window.impeccableAnalyzeVisualContrast = analyzeVisualContrast;
+  window.impeccableGetLastVisualContrastAnalyses = () => lastVisualContrastAnalyses.slice();
+}
diff --git a/tools/design-detector/detector/cli/main.mjs b/tools/design-detector/detector/cli/main.mjs
new file mode 100644
index 0000000..f70027b
--- /dev/null
+++ b/tools/design-detector/detector/cli/main.mjs
@@ -0,0 +1,290 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+import { loadDesignSystemForCwd } from '../design-system.mjs';
+import { createBrowserDetector, detectUrl } from '../engines/browser/detect-url.mjs';
+import { detectHtml } from '../engines/static-html/detect-html.mjs';
+import { detectText } from '../engines/regex/detect-text.mjs';
+import {
+  filterDetectionFindings,
+  readDetectionConfig,
+  shouldIgnoreDetectionFile,
+} from '../../lib/impeccable-config.mjs';
+import {
+  HTML_EXTENSIONS,
+  buildImportGraph,
+  detectFrameworkConfig,
+  isPortListening,
+  walkDir,
+} from '../node/file-system.mjs';
+
+// ---------------------------------------------------------------------------
+// Output formatting
+// ---------------------------------------------------------------------------
+
+function formatFindingSummary(count) {
+  return `${count} anti-pattern${count === 1 ? '' : 's'} found.`;
+}
+
+function formatFindings(findings, jsonMode) {
+  if (jsonMode) return JSON.stringify(findings, null, 2);
+
+  const grouped = {};
+  for (const f of findings) {
+    if (!grouped[f.file]) grouped[f.file] = [];
+    grouped[f.file].push(f);
+  }
+  const out = [];
+  for (const [file, items] of Object.entries(grouped)) {
+    const importNote = items[0]?.importedBy?.length ? ` (imported by ${items[0].importedBy.join(', ')})` : '';
+    out.push(`\n${file}${importNote}`);
+    for (const item of items) {
+      out.push(`  ${item.line ? `line ${item.line}: ` : ''}[${item.antipattern}] ${item.snippet}`);
+      out.push(`    → ${item.description}`);
+    }
+  }
+  out.push(`\n${formatFindingSummary(findings.length)}`);
+  return out.join('\n');
+}
+
+// ---------------------------------------------------------------------------
+// Stdin handling
+// ---------------------------------------------------------------------------
+
+async function handleStdin(options = {}) {
+  const chunks = [];
+  for await (const chunk of process.stdin) chunks.push(chunk);
+  const input = Buffer.concat(chunks).toString('utf-8');
+  try {
+    const parsed = JSON.parse(input);
+    const fp = parsed?.tool_input?.file_path;
+    if (fp && fs.existsSync(fp)) {
+      return HTML_EXTENSIONS.has(path.extname(fp).toLowerCase())
+        ? detectHtml(fp, options) : detectText(fs.readFileSync(fp, 'utf-8'), fp, options);
+    }
+  } catch { /* not JSON */ }
+  return detectText(input, '<stdin>', options);
+}
+
+
+// ---------------------------------------------------------------------------
+// CLI
+// ---------------------------------------------------------------------------
+
+async function confirm(question) {
+  const rl = (await import('node:readline')).default.createInterface({
+    input: process.stdin, output: process.stderr,
+  });
+  return new Promise((resolve) => {
+    rl.question(`${question} [Y/n] `, (answer) => {
+      rl.close();
+      resolve(!answer || /^y(es)?$/i.test(answer.trim()));
+    });
+  });
+}
+
+function printUsage() {
+  console.log(`Usage: impeccable detect [options] [file-or-dir-or-url...]
+
+Scan files or URLs for UI anti-patterns and design quality issues.
+
+Options:
+  --json              Output results as JSON
+  --quiet             In text mode, only print the final findings count
+  --gpt               Also report GPT-specific provider tells (off by default)
+  --gemini            Also report Gemini-specific provider tells (off by default)
+  --no-config         Do not apply project config, detector ignores, inline
+                      ignore comments, or DESIGN.md
+  --no-inline-ignores Do not honor in-file impeccable-disable* ignore comments
+  --no-design-system  Do not load local DESIGN.md / .impeccable/design.json context
+  --help              Show this help message
+
+Project config:
+  Respects .impeccable/config.json and .impeccable/config.local.json detector
+  settings: detector.ignoreRules, detector.ignoreFiles, detector.ignoreValues,
+  and detector.designSystem.enabled.
+
+Inline ignores:
+  In-file comments waive a finding where it lives and travel with the file:
+    <!-- impeccable-disable overused-font -- exported brand doc -->
+    .brand { font-family: Inter } /* impeccable-disable-line overused-font */
+    // impeccable-disable-next-line bounce-easing: intentional bounce
+  impeccable-disable applies to the whole file; -line / -next-line are scoped.
+  List one or more rule ids (comma-separated), or omit them / use * for all.
+
+Detection modes:
+  HTML files     Static HTML/CSS analysis (default, catches linked CSS)
+  Non-HTML files Regex pattern matching (CSS, JSX, TSX, etc.)
+  URLs           Puppeteer full browser rendering (auto-detected)
+
+Examples:
+  impeccable detect src/
+  impeccable detect index.html
+  impeccable detect https://example.com
+  impeccable detect --json .
+  impeccable detect --no-config src/`);
+}
+
+async function detectCli() {
+  let args = process.argv.slice(2).map(arg => {
+    if (arg === '-json') return '--json';
+    if (arg === '-fast') return '--fast';
+    return arg;
+  });
+  if (args[0] === 'detect') args = args.slice(1);
+  const jsonMode = args.includes('--json');
+  const quietMode = args.includes('--quiet');
+  const helpMode = args.includes('--help');
+  // --fast (regex-only) is deprecated: since the jsdom removal, the static
+  // HTML/CSS analysis is fast and covers every rule, so the regex-only path
+  // only loses coverage for no real speed win. Accept the flag for back-compat
+  // but ignore it and run the full scan.
+  if (args.includes('--fast')) {
+    process.stderr.write(
+      'Note: --fast is deprecated and ignored. The full scan is fast now and runs every rule.\n',
+    );
+  }
+  const configEnabled = !args.includes('--no-config');
+  const detectionConfig = configEnabled
+    ? readDetectionConfig(process.cwd())
+    : { ignoreRules: [], ignoreFiles: [], ignoreValues: [] };
+  const providers = [];
+  if (args.includes('--gpt')) providers.push('gpt');
+  if (args.includes('--gemini')) providers.push('gemini');
+  const designSystemEnabled = configEnabled && !args.includes('--no-design-system') && detectionConfig.designSystem?.enabled !== false;
+  const designSystem = designSystemEnabled ? loadDesignSystemForCwd(process.cwd()) : null;
+  // Inline `impeccable-disable*` waivers are part of the scanned file, so they
+  // apply by default. `--no-config` (raw scan) and the dedicated
+  // `--no-inline-ignores` both turn them off.
+  const inlineIgnoresEnabled = configEnabled && !args.includes('--no-inline-ignores');
+  const scanOptions = { providers, inlineIgnores: inlineIgnoresEnabled };
+  if (designSystem) scanOptions.designSystem = designSystem;
+  const targets = args.filter(a => !a.startsWith('--'));
+
+  if (helpMode) { printUsage(); process.exit(0); }
+
+  let allFindings = [];
+
+  if (!process.stdin.isTTY && targets.length === 0) {
+    allFindings = await handleStdin(scanOptions);
+  } else {
+    const paths = targets.length > 0 ? targets : [process.cwd()];
+    const urlTargetCount = paths.filter(target => /^https?:\/\//i.test(target)).length;
+    const browserDetector = urlTargetCount > 1 ? await createBrowserDetector() : null;
+
+    try {
+      for (const target of paths) {
+        if (/^https?:\/\//i.test(target)) {
+          try {
+            const scanner = browserDetector
+              ? (url) => browserDetector.detectUrl(url, scanOptions)
+              : (url) => detectUrl(url, scanOptions);
+            allFindings.push(...await scanner(target));
+          } catch (e) { process.stderr.write(`Error: ${e.message}\n`); }
+          continue;
+        }
+
+        const resolved = path.resolve(target);
+        let stat;
+        try { stat = fs.statSync(resolved); }
+        catch { process.stderr.write(`Warning: cannot access ${target}\n`); continue; }
+
+        if (stat.isDirectory()) {
+          // Check for framework dev server config (skip in JSON/quiet modes to avoid polluting output)
+          if (!jsonMode && !quietMode) {
+            const fwConfig = detectFrameworkConfig(resolved);
+            if (fwConfig) {
+              const probe = await isPortListening(fwConfig.port, fwConfig.fingerprint);
+              if (probe.listening && probe.matched) {
+                process.stderr.write(
+                  `\n${fwConfig.name} dev server detected on localhost:${fwConfig.port}.\n` +
+                  `For more accurate results, scan the running site:\n` +
+                  `  npx impeccable detect http://localhost:${fwConfig.port}\n\n`
+                );
+              } else if (probe.listening && !probe.matched) {
+                process.stderr.write(
+                  `\n${fwConfig.name} project detected (${path.basename(fwConfig.configPath)}).\n` +
+                  `Port ${fwConfig.port} is in use by another service. Start the ${fwConfig.name} dev server and scan via URL for best results.\n\n`
+                );
+              } else {
+                process.stderr.write(
+                  `\n${fwConfig.name} project detected (${path.basename(fwConfig.configPath)}).\n` +
+                  `Start the dev server and scan via URL for best results:\n` +
+                  `  npx impeccable detect http://localhost:${fwConfig.port}\n\n`
+                );
+              }
+            }
+          }
+
+          const files = walkDir(resolved)
+            .filter(file => !shouldIgnoreDetectionFile(file, process.cwd(), detectionConfig));
+          const htmlCount = files.filter(f => HTML_EXTENSIONS.has(path.extname(f).toLowerCase())).length;
+
+          // Warn and confirm if scanning many files (static HTML/CSS processes each HTML file)
+          if (files.length > 50 && process.stdin.isTTY && !jsonMode && !quietMode) {
+            process.stderr.write(
+              `\nFound ${files.length} files (${htmlCount} HTML) in ${target}.\n` +
+              `Scanning may take a while${htmlCount > 10 ? ' (static HTML/CSS processes each HTML file individually)' : ''}.\n` +
+              `Target a specific subdirectory to narrow scope.\n`
+            );
+            const ok = await confirm('Continue?');
+            if (!ok) { process.stderr.write('Aborted.\n'); process.exit(0); }
+          }
+
+          // Build import graph for multi-file awareness
+          const graph = buildImportGraph(files);
+          // Build reverse map: file -> set of files that import it
+          const importedByMap = new Map();
+          for (const [importer, imports] of graph) {
+            for (const imported of imports) {
+              if (!importedByMap.has(imported)) importedByMap.set(imported, new Set());
+              importedByMap.get(imported).add(importer);
+            }
+          }
+
+          for (const file of files) {
+            const ext = path.extname(file).toLowerCase();
+            let fileFindings;
+            if (HTML_EXTENSIONS.has(ext)) {
+              fileFindings = await detectHtml(file, scanOptions);
+            } else {
+              fileFindings = detectText(fs.readFileSync(file, 'utf-8'), file, scanOptions);
+            }
+            // Annotate findings with import context
+            const importers = importedByMap.get(file);
+            if (importers && importers.size > 0) {
+              const importerNames = [...importers].map(f => path.basename(f));
+              for (const f of fileFindings) {
+                f.importedBy = importerNames;
+              }
+            }
+            allFindings.push(...fileFindings);
+          }
+        } else if (stat.isFile()) {
+          if (shouldIgnoreDetectionFile(resolved, process.cwd(), detectionConfig)) continue;
+          const ext = path.extname(resolved).toLowerCase();
+          if (HTML_EXTENSIONS.has(ext)) {
+            allFindings.push(...await detectHtml(resolved, scanOptions));
+          } else {
+            allFindings.push(...detectText(fs.readFileSync(resolved, 'utf-8'), resolved, scanOptions));
+          }
+        }
+      }
+    } finally {
+      if (browserDetector) await browserDetector.close();
+    }
+  }
+
+  allFindings = filterDetectionFindings(allFindings, detectionConfig);
+
+  if (allFindings.length > 0) {
+    if (jsonMode) process.stdout.write(formatFindings(allFindings, true) + '\n');
+    else if (quietMode) process.stderr.write(formatFindingSummary(allFindings.length) + '\n');
+    else process.stderr.write(formatFindings(allFindings, false) + '\n');
+    process.exit(2);
+  }
+  if (jsonMode) process.stdout.write('[]\n');
+  process.exit(0);
+}
+
+export { formatFindings, handleStdin, confirm, printUsage, detectCli };
diff --git a/tools/design-detector/detector/design-system.mjs b/tools/design-detector/detector/design-system.mjs
new file mode 100644
index 0000000..352148d
--- /dev/null
+++ b/tools/design-detector/detector/design-system.mjs
@@ -0,0 +1,750 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+import { finding } from './findings.mjs';
+import { GENERIC_FONTS } from './shared/constants.mjs';
+import { parseAnyColor, resolveLengthPx } from './rules/checks.mjs';
+
+const DESIGN_NAMES = ['DESIGN.md', 'Design.md', 'design.md'];
+const FALLBACK_DIRS = ['.agents/context', 'docs'];
+const COLOR_CHANNEL_TOLERANCE = 6;
+const RADIUS_TOLERANCE_PX = 0.5;
+
+const CSS_COLOR_RE = /#[0-9a-f]{3,8}\b|rgba?\([^)]+\)|oklch\([^)]+\)|hsla?\([^)]+\)/gi;
+const FONT_DECL_RE = /font-family\s*:\s*([^;}\n]+)/gi;
+const FONT_JS_RE = /fontFamily\s*[:=]\s*["'`]([^"'`]+)["'`]/g;
+const GOOGLE_FONT_RE = /fonts\.googleapis\.com\/css2?\?[^"'\s)<>]*/gi;
+const BORDER_RADIUS_RE = /border-radius\s*:\s*([^;}\n]+)/gi;
+const BORDER_RADIUS_JS_RE = /borderRadius\s*[:=]\s*["'`]([^"'`]+)["'`]/g;
+const STATIC_DESIGN_SKIP_TAGS = new Set(['head', 'title', 'meta', 'link', 'style', 'script', 'noscript', 'template', 'source']);
+
+function firstExisting(dir, names) {
+  for (const name of names) {
+    const abs = path.join(dir, name);
+    if (fs.existsSync(abs)) return abs;
+  }
+  return null;
+}
+
+function resolveDesignMdPath(cwd = process.cwd()) {
+  const root = firstExisting(cwd, DESIGN_NAMES);
+  if (root) return { path: root, contextDir: cwd };
+
+  for (const rel of FALLBACK_DIRS) {
+    const dir = path.resolve(cwd, rel);
+    const found = firstExisting(dir, DESIGN_NAMES);
+    if (found) return { path: found, contextDir: dir };
+  }
+
+  return null;
+}
+
+function resolveDesignSidecarPath(cwd = process.cwd(), contextDir = cwd) {
+  const candidates = [
+    path.join(cwd, '.impeccable', 'design.json'),
+    path.join(cwd, 'DESIGN.json'),
+    path.join(contextDir, 'DESIGN.json'),
+  ];
+  return candidates.find((candidate, index) =>
+    candidates.indexOf(candidate) === index && fs.existsSync(candidate)
+  ) || null;
+}
+
+function parseFrontmatter(md) {
+  const lines = String(md || '').split(/\r?\n/);
+  if (lines[0]?.trim() !== '---') return null;
+  let end = -1;
+  for (let i = 1; i < lines.length; i++) {
+    if (lines[i].trim() === '---') { end = i; break; }
+  }
+  if (end === -1) return null;
+  try {
+    return parseYamlSubset(lines.slice(1, end).join('\n'));
+  } catch {
+    return null;
+  }
+}
+
+function parseYamlSubset(yaml) {
+  const root = {};
+  const stack = [{ indent: -1, obj: root }];
+
+  for (const raw of String(yaml || '').split(/\r?\n/)) {
+    if (!raw.trim() || /^\s*#/.test(raw)) continue;
+    const indent = raw.match(/^\s*/)[0].length;
+    const content = raw.slice(indent);
+    const colonIdx = findTopLevelColon(content);
+    if (colonIdx === -1) continue;
+
+    while (stack.length > 1 && stack[stack.length - 1].indent >= indent) stack.pop();
+
+    const key = unquoteYamlKey(content.slice(0, colonIdx).trim());
+    const rest = stripInlineYamlComment(content.slice(colonIdx + 1).trim());
+    const parent = stack[stack.length - 1].obj;
+
+    if (rest === '') {
+      const obj = {};
+      parent[key] = obj;
+      stack.push({ indent, obj });
+    } else {
+      parent[key] = parseScalar(rest);
+    }
+  }
+
+  return root;
+}
+
+function findTopLevelColon(s) {
+  let inQuote = null;
+  for (let i = 0; i < s.length; i++) {
+    const ch = s[i];
+    if (inQuote) {
+      if (ch === inQuote && s[i - 1] !== '\\') inQuote = null;
+    } else if (ch === '"' || ch === "'") {
+      inQuote = ch;
+    } else if (ch === ':') {
+      return i;
+    }
+  }
+  return -1;
+}
+
+function unquoteYamlKey(key) {
+  if ((key.startsWith('"') && key.endsWith('"')) || (key.startsWith("'") && key.endsWith("'"))) {
+    return key.slice(1, -1);
+  }
+  return key;
+}
+
+function stripInlineYamlComment(s) {
+  let inQuote = null;
+  for (let i = 0; i < s.length; i++) {
+    const ch = s[i];
+    if (inQuote) {
+      if (ch === inQuote && s[i - 1] !== '\\') inQuote = null;
+    } else if (ch === '"' || ch === "'") {
+      inQuote = ch;
+    } else if (ch === '#' && i > 0 && /\s/.test(s[i - 1])) {
+      return s.slice(0, i).trimEnd();
+    }
+  }
+  return s;
+}
+
+function parseScalar(raw) {
+  const s = raw.trim();
+  if ((s.startsWith('"') && s.endsWith('"')) || (s.startsWith("'") && s.endsWith("'"))) {
+    return s.slice(1, -1);
+  }
+  if (s === 'true') return true;
+  if (s === 'false') return false;
+  if (s === 'null' || s === '~') return null;
+  if (/^-?\d+$/.test(s)) return Number(s);
+  if (/^-?\d*\.\d+$/.test(s)) return Number(s);
+  return s;
+}
+
+function safeReadJson(filePath) {
+  if (!filePath) return null;
+  try {
+    return JSON.parse(fs.readFileSync(filePath, 'utf-8'));
+  } catch {
+    return null;
+  }
+}
+
+function normalizeFontName(value) {
+  return String(value || '')
+    .trim()
+    .replace(/\s*!important\s*$/i, '')
+    .trim()
+    .replace(/^["']|["']$/g, '')
+    .replace(/\+/g, ' ')
+    .replace(/\s+/g, ' ')
+    .toLowerCase();
+}
+
+function splitFontStack(stack) {
+  return String(stack || '')
+    .replace(/\s*!important\s*$/i, '')
+    .split(',')
+    .map(normalizeFontName)
+    .filter(Boolean);
+}
+
+function primaryFont(stack) {
+  if (!stack || /var\(/i.test(stack) || !isLiteralFontStack(stack)) return '';
+  return splitFontStack(stack).find(font => !GENERIC_FONTS.has(font)) || '';
+}
+
+function isLiteralFontStack(stack) {
+  const text = String(stack || '');
+  return !/[$`{}]|\s\+\s|\|\|/.test(text);
+}
+
+function cssColorLabel(raw) {
+  return String(raw || '').trim().replace(/\s+/g, ' ');
+}
+
+function colorKey(color) {
+  if (!color) return '';
+  return `${color.r},${color.g},${color.b}`;
+}
+
+function colorsClose(a, b) {
+  if (!a || !b) return false;
+  return Math.max(
+    Math.abs(a.r - b.r),
+    Math.abs(a.g - b.g),
+    Math.abs(a.b - b.b),
+  ) <= COLOR_CHANNEL_TOLERANCE;
+}
+
+function hslToRgb(H, S, L, alpha = 1) {
+  const h = (((H % 360) + 360) % 360) / 360;
+  const s = Math.max(0, Math.min(1, S));
+  const l = Math.max(0, Math.min(1, L));
+  const hue2rgb = (p, q, t) => {
+    if (t < 0) t += 1;
+    if (t > 1) t -= 1;
+    if (t < 1 / 6) return p + (q - p) * 6 * t;
+    if (t < 1 / 2) return q;
+    if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
+    return p;
+  };
+  const q = l < 0.5 ? l * (1 + s) : l + s - l * s;
+  const p = 2 * l - q;
+  return {
+    r: Math.round(hue2rgb(p, q, h + 1 / 3) * 255),
+    g: Math.round(hue2rgb(p, q, h) * 255),
+    b: Math.round(hue2rgb(p, q, h - 1 / 3) * 255),
+    a: alpha,
+  };
+}
+
+function parseDesignColor(value) {
+  const text = String(value || '').trim();
+  const parsed = parseAnyColor(text);
+  if (parsed) return parsed;
+  const hsl = text.match(/hsla?\(\s*([-\d.]+)(?:deg)?\s*,?\s*([\d.]+)%\s*,?\s*([\d.]+)%(?:\s*[,/]\s*([\d.]+))?\s*\)/i);
+  if (hsl) {
+    return hslToRgb(
+      parseFloat(hsl[1]),
+      parseFloat(hsl[2]) / 100,
+      parseFloat(hsl[3]) / 100,
+      hsl[4] !== undefined ? parseFloat(hsl[4]) : 1,
+    );
+  }
+  return null;
+}
+
+function addDesignColor(out, value, label) {
+  const parsed = parseDesignColor(value);
+  if (!parsed) return;
+  const key = colorKey(parsed);
+  if (!out.allowedColorKeys.has(key)) {
+    out.allowedColorKeys.set(key, { color: parsed, labels: [] });
+  }
+  out.allowedColorKeys.get(key).labels.push(label || cssColorLabel(value));
+}
+
+function addColorObject(out, colors, prefix = 'colors') {
+  if (!colors || typeof colors !== 'object') return;
+  for (const [name, value] of Object.entries(colors)) {
+    if (typeof value === 'string') {
+      addDesignColor(out, value, `${prefix}.${name}`);
+    }
+  }
+}
+
+function addSidecarColors(out, sidecar) {
+  const colorMeta = sidecar?.extensions?.colorMeta;
+  if (!colorMeta || typeof colorMeta !== 'object') return;
+
+  for (const [name, meta] of Object.entries(colorMeta)) {
+    if (!meta || typeof meta !== 'object') continue;
+    if (typeof meta.canonical === 'string') addDesignColor(out, meta.canonical, `sidecar.${name}`);
+    if (Array.isArray(meta.tonalRamp)) {
+      for (const [index, value] of meta.tonalRamp.entries()) {
+        if (typeof value === 'string') addDesignColor(out, value, `sidecar.${name}.tonalRamp[${index}]`);
+      }
+    }
+  }
+}
+
+function addTypographyFonts(out, typography) {
+  if (!typography || typeof typography !== 'object') return;
+  for (const role of Object.values(typography)) {
+    if (!role || typeof role !== 'object') continue;
+    if (typeof role.fontFamily !== 'string') continue;
+    for (const font of splitFontStack(role.fontFamily)) {
+      if (!GENERIC_FONTS.has(font)) out.allowedFonts.add(font);
+    }
+  }
+}
+
+function addRoundedScale(out, rounded) {
+  if (!rounded || typeof rounded !== 'object') return;
+  for (const [rawName, value] of Object.entries(rounded)) {
+    const name = unquoteYamlKey(rawName).toLowerCase();
+    addRoundedToken(out, name, value);
+  }
+}
+
+function addRoundedToken(out, name, value) {
+  if (typeof value !== 'string' && typeof value !== 'number') return;
+  const raw = String(value).trim();
+  if (!raw || /var\(/i.test(raw) || raw.includes('%')) return;
+  const px = resolveLengthPx(raw, 16);
+  if (px == null || !Number.isFinite(px)) return;
+  out.allowedRadii.push({ name, value: raw, px });
+  if (/(^|\.)(full|pill|round|rounded-full)$/.test(name)) out.hasPillRadius = true;
+}
+
+function addSidecarRadii(out, sidecar) {
+  const roundedMeta = sidecar?.extensions?.roundedMeta;
+  if (!roundedMeta || typeof roundedMeta !== 'object') return;
+
+  for (const [rawName, meta] of Object.entries(roundedMeta)) {
+    const name = unquoteYamlKey(rawName).toLowerCase();
+    if (typeof meta === 'string' || typeof meta === 'number') {
+      addRoundedToken(out, `sidecar.${name}`, meta);
+      continue;
+    }
+    if (!meta || typeof meta !== 'object') continue;
+    for (const key of ['canonical', 'value']) {
+      if (typeof meta[key] === 'string' || typeof meta[key] === 'number') {
+        addRoundedToken(out, `sidecar.${name}.${key}`, meta[key]);
+      }
+    }
+    for (const key of ['values', 'aliases']) {
+      if (!Array.isArray(meta[key])) continue;
+      for (const [index, value] of meta[key].entries()) {
+        addRoundedToken(out, `sidecar.${name}.${key}[${index}]`, value);
+      }
+    }
+    if (/^(full|pill|round|rounded-full)$/.test(name) || /^(full|pill|round)$/i.test(String(meta.role || ''))) {
+      out.hasPillRadius = true;
+    }
+  }
+}
+
+function normalizeDesignSystem(input = {}) {
+  const frontmatter = input.frontmatter || {};
+  const sidecar = input.sidecar || null;
+  const out = {
+    present: true,
+    sourcePath: input.sourcePath || null,
+    sidecarPath: input.sidecarPath || null,
+    mdNewerThanJson: input.mdNewerThanJson === true,
+    allowedFonts: new Set(),
+    allowedColorKeys: new Map(),
+    allowedRadii: [],
+    hasPillRadius: false,
+  };
+
+  addTypographyFonts(out, frontmatter.typography);
+  addColorObject(out, frontmatter.colors);
+  addSidecarColors(out, sidecar);
+  addRoundedScale(out, frontmatter.rounded);
+  addSidecarRadii(out, sidecar);
+
+  out.hasFonts = out.allowedFonts.size > 0;
+  out.hasColors = out.allowedColorKeys.size > 0;
+  out.hasRadii = out.allowedRadii.length > 0;
+  return out;
+}
+
+function loadDesignSystemForCwd(cwd = process.cwd()) {
+  const md = resolveDesignMdPath(cwd);
+  if (!md) return null;
+
+  let frontmatter = null;
+  let mdStat = null;
+  try {
+    mdStat = fs.statSync(md.path);
+    frontmatter = parseFrontmatter(fs.readFileSync(md.path, 'utf-8'));
+  } catch {
+    return null;
+  }
+  if (!frontmatter || typeof frontmatter !== 'object') return null;
+
+  const sidecarPath = resolveDesignSidecarPath(cwd, md.contextDir);
+  const sidecar = safeReadJson(sidecarPath);
+  let sidecarStat = null;
+  try {
+    if (sidecarPath) sidecarStat = fs.statSync(sidecarPath);
+  } catch {
+    sidecarStat = null;
+  }
+
+  return normalizeDesignSystem({
+    frontmatter,
+    sidecar,
+    sourcePath: md.path,
+    sidecarPath,
+    mdNewerThanJson: !!(mdStat && sidecarStat && mdStat.mtimeMs > sidecarStat.mtimeMs + 1000),
+  });
+}
+
+function isAllowedFont(font, designSystem) {
+  if (!font || GENERIC_FONTS.has(font)) return true;
+  if (!designSystem?.hasFonts) return true;
+  return designSystem.allowedFonts.has(font);
+}
+
+function isAllowedColorRaw(raw, designSystem) {
+  if (!designSystem?.hasColors) return true;
+  const text = String(raw || '').trim().toLowerCase();
+  if (!text || text === 'transparent' || text === 'currentcolor' || text === 'inherit' || text === 'initial') return true;
+  if (text.includes('var(')) return true;
+  const parsed = parseDesignColor(text);
+  if (!parsed) return true;
+  if ((parsed.a ?? 1) <= 0.05) return true;
+  for (const entry of designSystem.allowedColorKeys.values()) {
+    if (colorsClose(parsed, entry.color)) return true;
+  }
+  return false;
+}
+
+function isAllowedRadiusRaw(raw, designSystem) {
+  if (!designSystem?.hasRadii) return true;
+  const text = String(raw || '').trim().toLowerCase();
+  if (!text || text === '0' || text === 'none' || text === 'initial' || text === 'inherit') return true;
+  if (text.includes('var(') || text.includes('%')) return true;
+  const px = resolveLengthPx(text, 16);
+  if (px == null || !Number.isFinite(px) || px <= RADIUS_TOLERANCE_PX) return true;
+  if (designSystem.hasPillRadius && px >= 99) return true;
+  return designSystem.allowedRadii.some(entry => Math.abs(entry.px - px) <= RADIUS_TOLERANCE_PX);
+}
+
+function lineLooksCommented(line) {
+  const trimmed = String(line || '').trim();
+  return trimmed.startsWith('//') || trimmed.startsWith('/*') || trimmed.startsWith('*') || trimmed.startsWith('<!--');
+}
+
+function isProbablyColorLiteral(line, match) {
+  const raw = match?.[0] || '';
+  const index = match.index ?? -1;
+  if (index < 0) return false;
+  if (isInsideCssAttributeSelector(line, index)) return false;
+
+  const before = line.slice(0, index);
+  const after = line.slice(index + raw.length);
+
+  if (raw.startsWith('#')) {
+    if (before.endsWith('&')) return false; // HTML numeric entity, e.g. &#8596;
+
+    const prevNonSpace = before.match(/\S(?=\s*$)/)?.[0] || '';
+    const nextNonSpace = after.match(/^\s*(\S)/)?.[1] || '';
+    if (prevNonSpace === '>' && nextNonSpace === '<') return false; // plain text, e.g. PR #155
+  }
+
+  const styleContext = /(?:^|[{\s;"'`(,])(?:color|background(?:-color|-image)?|border(?:-(?:top|right|bottom|left))?(?:-color)?|outline(?:-color)?|box-shadow|text-shadow|fill|stroke)\s*:\s*[^;{}"'`]*/i.test(before);
+  const cssFunctionContext = /(?:linear-gradient|radial-gradient|conic-gradient|color-mix)\([^)]*$/i.test(before);
+  const jsColorKeyContext = /(?:^|[,{]\s*)(?:color|background|backgroundColor|borderColor|outlineColor|fill|stroke|boxShadow|textShadow)\s*[:=]\s*["'`]?[^"'`,}]*/i.test(before);
+
+  return styleContext || cssFunctionContext || jsColorKeyContext;
+}
+
+function isInsideCssAttributeSelector(line, index) {
+  if (index < 0) return false;
+  const before = line.slice(0, index);
+  const lastOpen = before.lastIndexOf('[');
+  if (lastOpen === -1) return false;
+  const lastClose = before.lastIndexOf(']');
+  if (lastClose > lastOpen) return false;
+  const after = line.slice(index);
+  const close = after.indexOf(']');
+  const block = after.indexOf('{');
+  return close !== -1 && (block === -1 || close < block);
+}
+
+function makeDesignFinding(id, filePath, snippet, line = 0, extras = {}) {
+  return { ...finding(id, filePath, snippet, line), ...extras };
+}
+
+function decodeGoogleFamily(value) {
+  const family = String(value || '').split(':')[0].replace(/\+/g, ' ');
+  try {
+    return decodeURIComponent(family);
+  } catch {
+    return family;
+  }
+}
+
+function checkFontStack(stack, filePath, line, designSystem, context) {
+  const primary = primaryFont(stack);
+  if (!primary || isAllowedFont(primary, designSystem)) return [];
+  const display = primary.replace(/\b\w/g, ch => ch.toUpperCase());
+  return [makeDesignFinding(
+    'design-system-font',
+    filePath,
+    `${context}: ${display} is not declared in DESIGN.md typography`,
+    line,
+    { ignoreValue: display },
+  )];
+}
+
+function extractRadiusTokens(value) {
+  return String(value || '')
+    .replace(/\s*\/\s*/g, ' ')
+    .split(/\s+/)
+    .map(token => token.trim())
+    .filter(Boolean);
+}
+
+function checkRadiusValue(value, filePath, line, designSystem, context) {
+  const findings = [];
+  for (const token of extractRadiusTokens(value)) {
+    if (isAllowedRadiusRaw(token, designSystem)) continue;
+    findings.push(makeDesignFinding(
+      'design-system-radius',
+      filePath,
+      `${context}: ${token} is outside the DESIGN.md rounded scale`,
+      line,
+      { ignoreValue: token },
+    ));
+  }
+  return findings;
+}
+
+function checkSourceDesignSystem(content, filePath, options = {}) {
+  const designSystem = options.designSystem;
+  if (!designSystem?.present) return [];
+
+  const findings = [];
+  const lines = String(content || '').split('\n');
+  for (let i = 0; i < lines.length; i++) {
+    const line = lines[i];
+    const lineNum = i + 1;
+    if (lineLooksCommented(line)) continue;
+
+    if (designSystem.hasFonts) {
+      for (const match of line.matchAll(FONT_DECL_RE)) {
+        findings.push(...checkFontStack(match[1], filePath, lineNum, designSystem, 'font-family'));
+      }
+      for (const match of line.matchAll(FONT_JS_RE)) {
+        findings.push(...checkFontStack(match[1], filePath, lineNum, designSystem, 'fontFamily'));
+      }
+      for (const match of line.matchAll(GOOGLE_FONT_RE)) {
+        const url = match[0];
+        for (const familyMatch of url.matchAll(/[?&]family=([^&]+)/g)) {
+          const font = normalizeFontName(decodeGoogleFamily(familyMatch[1]));
+          if (!font || isAllowedFont(font, designSystem)) continue;
+          const display = decodeGoogleFamily(familyMatch[1]);
+          findings.push(makeDesignFinding(
+            'design-system-font',
+            filePath,
+            `Google Fonts: ${display} is not declared in DESIGN.md typography`,
+            lineNum,
+            { ignoreValue: display },
+          ));
+        }
+      }
+    }
+
+    if (designSystem.hasColors) {
+      for (const match of line.matchAll(CSS_COLOR_RE)) {
+        if (!isProbablyColorLiteral(line, match)) continue;
+        const raw = cssColorLabel(match[0]);
+        if (isAllowedColorRaw(raw, designSystem)) continue;
+        findings.push(makeDesignFinding(
+          'design-system-color',
+          filePath,
+          `Undocumented color ${raw} is outside DESIGN.md colors`,
+          lineNum,
+          { ignoreValue: raw },
+        ));
+      }
+    }
+
+    if (designSystem.hasRadii) {
+      for (const match of line.matchAll(BORDER_RADIUS_RE)) {
+        findings.push(...checkRadiusValue(match[1], filePath, lineNum, designSystem, 'border-radius'));
+      }
+      for (const match of line.matchAll(BORDER_RADIUS_JS_RE)) {
+        findings.push(...checkRadiusValue(match[1], filePath, lineNum, designSystem, 'borderRadius'));
+      }
+    }
+  }
+
+  return dedupeDesignFindings(findings);
+}
+
+function hasDirectText(el) {
+  return Array.from(el.childNodes || []).some(node => node.nodeType === 3 && node.textContent.trim().length > 0);
+}
+
+function sampleText(el) {
+  const text = String(el.textContent || '').replace(/\s+/g, ' ').trim();
+  return text ? ` "${text.slice(0, 40)}"` : '';
+}
+
+function collectStaticDesignSystemFindings(document, window, filePath, designSystem) {
+  if (!designSystem?.present) return [];
+  const findings = [];
+  const seenFonts = new Set();
+  const seenColors = new Set();
+  const seenRadii = new Set();
+
+  for (const el of document.querySelectorAll('*')) {
+    if (shouldSkipStaticDesignElement(el, window)) continue;
+    const tag = el.tagName?.toLowerCase?.() || 'unknown';
+    const style = window.getComputedStyle(el);
+
+    if (designSystem.hasFonts && hasDirectText(el)) {
+      const font = primaryFont(style.fontFamily || '');
+      if (font && !seenFonts.has(font) && !isAllowedFont(font, designSystem)) {
+        seenFonts.add(font);
+        findings.push(makeDesignFinding(
+          'design-system-font',
+          filePath,
+          `${tag}${sampleText(el)} uses ${font}; not declared in DESIGN.md typography`,
+          0,
+          { ignoreValue: font },
+        ));
+      }
+    }
+
+    if (designSystem.hasColors) {
+      const colorChecks = [];
+      if (hasDirectText(el)) colorChecks.push(['text color', style.color]);
+      if (!isTransparentCss(style.backgroundColor)) colorChecks.push(['background', style.backgroundColor]);
+      for (const side of ['Top', 'Right', 'Bottom', 'Left']) {
+        if ((parseFloat(style[`border${side}Width`]) || 0) > 0) {
+          colorChecks.push([`border-${side.toLowerCase()}`, style[`border${side}Color`]]);
+        }
+      }
+      if ((parseFloat(style.outlineWidth) || 0) > 0) colorChecks.push(['outline', style.outlineColor]);
+
+      for (const [kind, raw] of colorChecks) {
+        const label = cssColorLabel(raw);
+        if (isAllowedColorRaw(label, designSystem)) continue;
+        const key = `${kind}:${label}`;
+        if (seenColors.has(key)) continue;
+        seenColors.add(key);
+        findings.push(makeDesignFinding(
+          'design-system-color',
+          filePath,
+          `${kind} ${label} on ${tag}${sampleText(el)} is outside DESIGN.md colors`,
+          0,
+          { ignoreValue: label },
+        ));
+      }
+    }
+
+    if (designSystem.hasRadii) {
+      const rawRadius = String(style.borderRadius || '').trim();
+      if (!rawRadius) continue;
+      for (const token of extractRadiusTokens(rawRadius)) {
+        if (isAllowedRadiusRaw(token, designSystem)) continue;
+        if (seenRadii.has(token)) continue;
+        seenRadii.add(token);
+        findings.push(makeDesignFinding(
+          'design-system-radius',
+          filePath,
+          `border-radius ${token} on ${tag}${sampleText(el)} is outside the DESIGN.md rounded scale`,
+          0,
+          { ignoreValue: token },
+        ));
+      }
+    }
+  }
+
+  return findings;
+}
+
+function shouldSkipStaticDesignElement(el, window) {
+  const tag = el.tagName?.toLowerCase?.() || '';
+  if (STATIC_DESIGN_SKIP_TAGS.has(tag)) return true;
+
+  let current = el;
+  while (current) {
+    if (current.getAttribute?.('hidden') !== null || current.getAttribute?.('aria-hidden') === 'true') return true;
+    const style = window.getComputedStyle(current);
+    const display = String(style.display || '').toLowerCase();
+    const visibility = String(style.visibility || '').toLowerCase();
+    if (display === 'none' || visibility === 'hidden' || visibility === 'collapse') return true;
+    current = current.parentElement;
+  }
+  return false;
+}
+
+function isTransparentCss(value) {
+  const text = String(value || '').trim().toLowerCase();
+  if (!text || text === 'transparent') return true;
+  const parsed = parseDesignColor(text);
+  return parsed ? (parsed.a ?? 1) <= 0.05 : false;
+}
+
+function canonicalDesignFindingKey(item) {
+  if (!item?.antipattern?.startsWith?.('design-system-')) return null;
+  const value = item.ignoreValue || item.value || '';
+  if (item.antipattern === 'design-system-font') {
+    const context = /google fonts/i.test(item.snippet || '') ? 'google-font' : 'font';
+    const font = normalizeFontName(value);
+    return font ? `${item.antipattern}:${context}:${font}` : null;
+  }
+  if (item.antipattern === 'design-system-color') {
+    const parsed = parseDesignColor(value);
+    if (parsed) return `${item.antipattern}:color:${colorKey(parsed)}`;
+    const label = cssColorLabel(value).toLowerCase();
+    return label ? `${item.antipattern}:color:${label}` : null;
+  }
+  if (item.antipattern === 'design-system-radius') {
+    const px = resolveLengthPx(String(value || '').trim(), 16);
+    if (px != null && Number.isFinite(px)) return `${item.antipattern}:radius:${Math.round(px * 100) / 100}`;
+    const label = String(value || '').trim().toLowerCase();
+    return label ? `${item.antipattern}:radius:${label}` : null;
+  }
+  return null;
+}
+
+function mergeDesignSystemFindings(...groups) {
+  const out = [];
+  const seen = new Map();
+  for (const group of groups) {
+    for (const item of group || []) {
+      const key = canonicalDesignFindingKey(item);
+      if (key) {
+        if (seen.has(key)) {
+          const existing = out[seen.get(key)];
+          if ((existing.line || 0) <= 0 && (item.line || 0) > 0) existing.line = item.line;
+          continue;
+        }
+        seen.set(key, out.length);
+      }
+      out.push(item);
+    }
+  }
+  return out;
+}
+
+function dedupeDesignFindings(findings) {
+  const out = [];
+  const seen = new Set();
+  for (const item of findings) {
+    const key = [
+      item.antipattern,
+      item.line || 0,
+      normalizeFontName(item.ignoreValue || item.snippet || ''),
+    ].join('\0');
+    if (seen.has(key)) continue;
+    seen.add(key);
+    out.push(item);
+  }
+  return out;
+}
+
+export {
+  parseFrontmatter,
+  normalizeDesignSystem,
+  loadDesignSystemForCwd,
+  isAllowedFont,
+  isAllowedColorRaw,
+  isAllowedRadiusRaw,
+  checkSourceDesignSystem,
+  collectStaticDesignSystemFindings,
+  mergeDesignSystemFindings,
+};
diff --git a/tools/design-detector/detector/detect-antipatterns-browser.js b/tools/design-detector/detector/detect-antipatterns-browser.js
new file mode 100644
index 0000000..b2091c6
--- /dev/null
+++ b/tools/design-detector/detector/detect-antipatterns-browser.js
@@ -0,0 +1,5138 @@
+/**
+ * Anti-Pattern Browser Detector for Impeccable
+ * Copyright (c) 2026 Paul Bakaus
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * GENERATED -- do not edit. Source: cli/engine/browser/injected/index.mjs
+ * Rebuild: node scripts/build-browser-detector.js
+ *
+ * Usage: <script src="detect-antipatterns-browser.js"></script>
+ * Re-scan: window.impeccableScan()
+ */
+(function () {
+if (typeof window === 'undefined') return;
+// --- cli/engine/shared/constants.mjs ---
+// ─── Section 1: Constants ───────────────────────────────────────────────────
+
+const SAFE_TAGS = new Set([
+  'blockquote', 'nav', 'a', 'input', 'textarea', 'select',
+  'pre', 'code', 'span', 'th', 'td', 'tr', 'li', 'label',
+  'button', 'hr', 'html', 'head', 'body', 'script', 'style',
+  'link', 'meta', 'title', 'br', 'img', 'svg', 'path', 'circle',
+  'rect', 'line', 'polyline', 'polygon', 'g', 'defs', 'use',
+]);
+
+// Per-check safe-tags override for the border (side-tab / border-accent)
+// rule. We intentionally re-allow <label> here because card-shaped clickable
+// labels (e.g. .checklist-item wrapping a checkbox + content) are one of the
+// canonical side-tab anti-pattern shapes and must be detected. The rule's
+// other preconditions (non-neutral color, width >= 2px on a single side,
+// radius > 0 or width >= 3, element size >= 20x20 in the browser path)
+// already filter out plain inline form labels so this does not introduce
+// false positives. See modern-color-borders.html for the test matrix.
+const BORDER_SAFE_TAGS = new Set(
+  [...SAFE_TAGS].filter(t => t !== 'label')
+);
+
+const OVERUSED_FONTS = new Set([
+  // Older monoculture (still ubiquitous):
+  'inter', 'roboto', 'open sans', 'lato', 'montserrat', 'arial', 'helvetica',
+  // Newer monoculture (the Anthropic-skill / Vercel / GitHub default wave):
+  'fraunces', 'instrument sans', 'instrument serif',
+  'geist', 'geist sans', 'geist mono',
+  'mona sans',
+  'plus jakarta sans', 'space grotesk', 'recoleta',
+]);
+
+// Brand-associated fonts: don't flag these as "overused" on the brand's own domains.
+// Keys are font names, values are arrays of hostname suffixes where the font is allowed.
+const GOOGLE_DOMAINS = [
+  'google.com', 'youtube.com', 'android.com', 'chromium.org',
+  'chrome.com', 'web.dev', 'gstatic.com', 'firebase.google.com',
+];
+const VERCEL_DOMAINS = ['vercel.com', 'nextjs.org', 'v0.app'];
+const GITHUB_DOMAINS = ['github.com', 'githubnext.com'];
+const BRAND_FONT_DOMAINS = {
+  'roboto': GOOGLE_DOMAINS,
+  'google sans': GOOGLE_DOMAINS,
+  'product sans': GOOGLE_DOMAINS,
+  'geist': VERCEL_DOMAINS,
+  'geist sans': VERCEL_DOMAINS,
+  'geist mono': VERCEL_DOMAINS,
+  'mona sans': GITHUB_DOMAINS,
+};
+
+function isBrandFontOnOwnDomain(font) {
+  if (typeof location === 'undefined') return false;
+  const allowed = BRAND_FONT_DOMAINS[font];
+  if (!allowed) return false;
+  const host = location.hostname.toLowerCase();
+  return allowed.some(suffix => host === suffix || host.endsWith('.' + suffix));
+}
+
+const GENERIC_FONTS = new Set([
+  'serif', 'sans-serif', 'monospace', 'cursive', 'fantasy',
+  'system-ui', 'ui-serif', 'ui-sans-serif', 'ui-monospace', 'ui-rounded',
+  '-apple-system', 'blinkmacsystemfont', 'segoe ui',
+  'inherit', 'initial', 'unset', 'revert',
+]);
+
+// WCAG large text thresholds are defined in points: 18pt normal text and
+// 14pt bold text. Browsers expose font-size in CSS pixels at 96px per inch.
+const WCAG_LARGE_TEXT_PX = 18 * (96 / 72);
+const WCAG_LARGE_BOLD_TEXT_PX = 14 * (96 / 72);
+
+// Serif faces that show up in italic-display heroes. The rule also fires when
+// the primary face is unknown but the stack ends in the generic `serif` token,
+// which catches custom/private faces with a serif fallback.
+const KNOWN_SERIF_FONTS = new Set([
+  'fraunces', 'recoleta', 'newsreader', 'playfair display', 'playfair',
+  'cormorant', 'cormorant garamond', 'garamond', 'eb garamond',
+  'tiempos', 'tiempos headline', 'tiempos text',
+  'lora', 'vollkorn', 'spectral',
+  'source serif pro', 'source serif 4', 'source serif',
+  'ibm plex serif', 'merriweather',
+  'libre caslon', 'libre baskerville', 'baskerville',
+  'georgia', 'times new roman', 'times',
+  'dm serif display', 'dm serif text',
+  'instrument serif', 'gt sectra', 'ogg', 'canela',
+  'freight display', 'freight text',
+]);
+
+// --- cli/engine/registry/antipatterns.mjs ---
+const ANTIPATTERNS = [
+  // ── AI slop: tells that something was AI-generated ──
+  {
+    id: 'side-tab',
+    category: 'slop',
+    name: 'Side-tab accent border',
+    description:
+      'Thick colored border on one side of a card — the most recognizable tell of AI-generated UIs. Use a subtler accent or remove it entirely.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'colored accent stripe',
+  },
+  {
+    id: 'border-accent-on-rounded',
+    category: 'slop',
+    name: 'Border accent on rounded element',
+    description:
+      'Thick accent border on a rounded card — the border clashes with the rounded corners. Remove the border or the border-radius.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'colored accent stripe',
+  },
+  {
+    id: 'overused-font',
+    category: 'slop',
+    name: 'Overused font',
+    description:
+      'Inter, Roboto, Fraunces, Geist, Plus Jakarta Sans, and Space Grotesk are used on so many sites they no longer feel distinctive. Each new wave of AI-generated UIs converges on the same handful of faces. Choose a face that gives your interface personality.',
+    skillSection: 'Typography',
+    skillGuideline: 'overused fonts like Inter',
+  },
+  {
+    id: 'single-font',
+    category: 'slop',
+    name: 'Single font for everything',
+    description:
+      'Only one font family is used for the entire page. Pair a distinctive display font with a refined body font to create typographic hierarchy.',
+    skillSection: 'Typography',
+    skillGuideline: 'only one font family for the entire page',
+  },
+  {
+    id: 'flat-type-hierarchy',
+    category: 'slop',
+    name: 'Flat type hierarchy',
+    description:
+      'Font sizes are too close together — no clear visual hierarchy. Use fewer sizes with more contrast (aim for at least a 1.25 ratio between steps).',
+    skillSection: 'Typography',
+    skillGuideline: 'flat type hierarchy',
+  },
+  {
+    id: 'gradient-text',
+    category: 'slop',
+    name: 'Gradient text',
+    description:
+      'Gradient text is decorative rather than meaningful — a common AI tell, especially on headings and metrics. Use solid colors for text.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'gradient text for',
+  },
+  {
+    id: 'ai-color-palette',
+    category: 'slop',
+    name: 'AI color palette',
+    description:
+      'Purple/violet gradients and cyan-on-dark are the most recognizable tells of AI-generated UIs. Choose a distinctive, intentional palette.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'AI color palette',
+  },
+  {
+    id: 'cream-palette',
+    category: 'slop',
+    name: 'Cream / beige palette',
+    description:
+      'A warm cream or beige page background has become the default "tasteful" AI surface, reached for by reflex. Choose a background that comes from a deliberate palette, not the safe warm off-white.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'cream and beige as the default surface',
+  },
+  {
+    id: 'nested-cards',
+    category: 'slop',
+    name: 'Nested cards',
+    description:
+      'Cards inside cards create visual noise and excessive depth. Flatten the hierarchy — use spacing, typography, and dividers instead of nesting containers.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'Nest cards inside cards',
+  },
+  {
+    id: 'monotonous-spacing',
+    category: 'slop',
+    name: 'Monotonous spacing',
+    description:
+      'The same spacing value used everywhere — no rhythm, no variation. Use tight groupings for related items and generous separations between sections.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'same spacing everywhere',
+  },
+  {
+    id: 'bounce-easing',
+    category: 'slop',
+    name: 'Bounce or elastic easing',
+    description:
+      'Bounce and elastic easing feel dated and tacky. Real objects decelerate smoothly — use exponential easing (ease-out-quart/quint/expo) instead.',
+    skillSection: 'Motion',
+    skillGuideline: 'bounce or elastic easing',
+  },
+  {
+    id: 'dark-glow',
+    category: 'slop',
+    name: 'Dark mode with glowing accents',
+    description:
+      'Dark backgrounds with colored box-shadow glows are the default "cool" look of AI-generated UIs. Use subtle, purposeful lighting instead — or skip the dark theme entirely.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'dark mode with glowing accents',
+  },
+  {
+    id: 'icon-tile-stack',
+    category: 'slop',
+    name: 'Icon tile stacked above heading',
+    description:
+      'A small rounded-square icon container above a heading is the universal AI feature-card template — every generator outputs this exact shape. Try a side-by-side icon and heading, or let the icon sit in flow without its own container.',
+    skillSection: 'Typography',
+    skillGuideline: 'large icons with rounded corners above every heading',
+  },
+  {
+    id: 'italic-serif-display',
+    category: 'slop',
+    name: 'Italic serif display headline',
+    description:
+      'Oversized italic serif (Fraunces, Recoleta, Playfair, Newsreader-italic) as the primary hero headline reads as taste in isolation but has become the universal AI-startup landing page hero. Set roman, or move to a non-serif display face. Editorial / magazine register may legitimately want this — judge by context.',
+    skillSection: 'Typography',
+    skillGuideline: 'oversized italic serif as the hero headline',
+  },
+  {
+    id: 'hero-eyebrow-chip',
+    category: 'slop',
+    name: 'Hero eyebrow / pill chip',
+    description:
+      'A tiny uppercase letter-spaced label sitting immediately above an oversized hero headline — or the same shape rendered as a pill chip — is now the default AI SaaS hero. Drop the eyebrow, integrate the kicker into the headline, or run it as a navigation breadcrumb instead.',
+    skillSection: 'Typography',
+    skillGuideline: 'tiny uppercase tracked label above the hero headline',
+  },
+  {
+    id: 'repeated-section-kickers',
+    category: 'slop',
+    severity: 'advisory',
+    name: 'Repeated section kicker labels',
+    description:
+      'Repeating tiny uppercase tracked labels above section headings turns a brand page into AI editorial scaffolding. Replace them with stronger structure, artifacts, imagery, or a deliberate brand system.',
+    skillSection: 'Typography',
+    skillGuideline: 'repeated eyebrow or kicker labels as section scaffolding',
+  },
+  {
+    id: 'numbered-section-markers',
+    category: 'slop',
+    severity: 'advisory',
+    name: 'Numbered section markers (01 / 02 / 03)',
+    description:
+      'Numbered display markers as section labels (01, 02, 03) are the AI editorial scaffold one tier deeper than tracked eyebrow chips. If you find yourself reaching for them, choose a different section cadence.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'numbered section markers',
+  },
+  {
+    id: 'em-dash-overuse',
+    category: 'slop',
+    name: 'Em-dash overuse',
+    description:
+      'More than two em-dashes (— or --) in body copy is an AI cadence tell. Use commas, colons, periods, or parentheses instead.',
+    skillSection: 'Copy',
+    skillGuideline: 'no em dashes',
+  },
+  {
+    id: 'marketing-buzzword',
+    category: 'slop',
+    name: 'Marketing buzzword',
+    description:
+      'Generic SaaS phrases (streamline / empower / supercharge / world-class / enterprise-grade / next-generation / cutting-edge / etc) are instant AI tells. Pick a specific verb and noun that says what the product literally does.',
+    skillSection: 'Copy',
+    skillGuideline: 'marketing buzzwords',
+  },
+  {
+    id: 'aphoristic-cadence',
+    category: 'slop',
+    name: 'Aphoristic-cadence copy',
+    description:
+      'Three or more sections landing on a short rebuttal sentence ("X. No Y." / "X. Just Y.") or a manufactured-contrast aphorism ("Not a feature. A platform.") reads as AI cadence, not voice. Once is fine; the pattern is the tell.',
+    skillSection: 'Copy',
+    skillGuideline: 'aphoristic cadence',
+  },
+  {
+    id: 'oversized-h1',
+    category: 'slop',
+    name: 'Oversized hero headline',
+    description:
+      'A full-sentence headline set at display size ends up dominating the viewport, leaving no room for anything else above the fold. A punchy one- or two-word headline at that size is fine — the problem is a long headline blown up too large. Set long headlines smaller, or tighten the copy.',
+    skillSection: 'Typography',
+    skillGuideline: 'long headline set at display size',
+  },
+  {
+    id: 'extreme-negative-tracking',
+    category: 'slop',
+    name: 'Crushed letter spacing',
+    description:
+      'Letter-spacing pulled tighter than the point where characters keep their own shapes costs legibility. Tighten display type optically, not destructively.',
+    skillSection: 'Typography',
+    skillGuideline: 'letter spacing crushed past legibility',
+  },
+  {
+    id: 'broken-image',
+    category: 'quality',
+    name: 'Broken or placeholder image',
+    description:
+      '<img> tags with empty src, missing src, or placeholder values ship as broken-image boxes. Use real images, generated assets, or remove the tag.',
+    skillSection: 'Imagery',
+    skillGuideline: 'broken image references',
+  },
+
+  // ── Quality: general design and accessibility issues ──
+  {
+    id: 'gray-on-color',
+    category: 'quality',
+    name: 'Gray text on colored background',
+    description:
+      'Gray text looks washed out on colored backgrounds. Use a darker shade of the background color instead, or white/near-white for contrast.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'gray text on colored backgrounds',
+  },
+  {
+    id: 'low-contrast',
+    category: 'quality',
+    name: 'Low contrast text',
+    description:
+      'Text does not meet WCAG AA contrast requirements (4.5:1 for body, 3:1 for large text). Increase the contrast between text and background.',
+  },
+  {
+    id: 'layout-transition',
+    category: 'quality',
+    name: 'Layout property animation',
+    description:
+      'Animating width, height, padding, or margin causes layout thrash and janky performance. Use transform and opacity instead, or grid-template-rows for height animations.',
+    skillSection: 'Motion',
+    skillGuideline: 'Animate layout properties',
+  },
+  {
+    id: 'line-length',
+    category: 'quality',
+    name: 'Line length too long',
+    description:
+      'Text lines wider than ~80 characters are hard to read. The eye loses its place tracking back to the start of the next line. Add a max-width (65ch to 75ch) to text containers.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'wrap beyond ~80 characters',
+  },
+  {
+    id: 'cramped-padding',
+    category: 'quality',
+    name: 'Cramped padding',
+    description:
+      'Text is too close to the edge of its container. Two shapes: (1) an element with its own text where the padding is too low for the font size, and (2) a wrapper with text-bearing children and near-zero padding against a visible boundary (border, outline, or non-transparent background) — children land flush against the boundary line. Add at least 8px (ideally 12–16px) of padding inside bordered, outlined, or colored containers.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'inside bordered or colored containers',
+  },
+  {
+    id: 'body-text-viewport-edge',
+    category: 'quality',
+    name: 'Body text touching viewport edge',
+    description:
+      'Body paragraphs render flush against the left or right viewport edge with no container providing horizontal padding. Wrap content in a container with at least 16px (ideally 24-32px) of horizontal padding, or apply max-width with mx-auto.',
+  },
+  {
+    id: 'tight-leading',
+    category: 'quality',
+    name: 'Tight line height',
+    description:
+      'Line height below 1.3x the font size makes multi-line text hard to read. Use 1.5 to 1.7 for body text so lines have room to breathe.',
+  },
+  {
+    id: 'skipped-heading',
+    category: 'quality',
+    name: 'Skipped heading level',
+    description:
+      'Heading levels should not skip (e.g. h1 then h3 with no h2). Screen readers use heading hierarchy for navigation. Skipping levels breaks the document outline.',
+  },
+  {
+    id: 'justified-text',
+    category: 'quality',
+    name: 'Justified text',
+    description:
+      'Justified text without hyphenation creates uneven word spacing ("rivers of white"). Use text-align: left for body text, or enable hyphens: auto if you must justify.',
+  },
+  {
+    id: 'tiny-text',
+    category: 'quality',
+    name: 'Tiny body text',
+    description:
+      'Body text below 12px is hard to read, especially on high-DPI screens. Use at least 14px for body content, 16px is ideal.',
+  },
+  {
+    id: 'all-caps-body',
+    category: 'quality',
+    name: 'All-caps body text',
+    description:
+      'Long passages in uppercase are hard to read. We recognize words by shape (ascenders and descenders), which all-caps removes. Reserve uppercase for short labels and headings.',
+    skillSection: 'Typography',
+    skillGuideline: 'long body passages in uppercase',
+  },
+  {
+    id: 'wide-tracking',
+    category: 'quality',
+    name: 'Wide letter spacing on body text',
+    description:
+      'Letter spacing above 0.05em on body text disrupts natural character groupings and slows reading. Reserve wide tracking for short uppercase labels only.',
+  },
+  {
+    id: 'text-overflow',
+    category: 'quality',
+    name: 'Content overflowing its container',
+    description:
+      'Content renders wider than its container, spilling out or forcing a horizontal scrollbar. Let text wrap, constrain widths, or give the region a deliberate scroll affordance.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'content wider than its container',
+  },
+  {
+    id: 'clipped-overflow-container',
+    category: 'quality',
+    name: 'Positioned child clipped by overflow container',
+    description:
+      'A clipping container (overflow hidden or clip) wrapping an absolutely-positioned child cuts off tooltips, menus, and popovers that need to escape. Let the overflow be visible, or move the positioned layer out of the clip.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'overflow container clipping positioned children',
+  },
+  {
+    id: 'design-system-font',
+    category: 'quality',
+    name: 'Font outside DESIGN.md',
+    description:
+      'A font is used that is not declared in DESIGN.md typography. Use the documented type system or update DESIGN.md if this is an intentional brand addition.',
+    skillSection: 'Typography',
+    skillGuideline: 'font family outside the project design system',
+  },
+  {
+    id: 'design-system-color',
+    category: 'quality',
+    severity: 'advisory',
+    name: 'Color outside DESIGN.md',
+    description:
+      'A literal color is outside the DESIGN.md palette and sidecar tonal ramps. This may be legitimate, but it should be an intentional design-system addition rather than drift.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'literal color outside the project design system',
+  },
+  {
+    id: 'design-system-radius',
+    category: 'quality',
+    severity: 'advisory',
+    name: 'Radius outside DESIGN.md',
+    description:
+      'A border-radius value is outside the DESIGN.md rounded scale. Use a documented radius token or update the design system if the new shape is intentional.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'border radius outside the project design system',
+  },
+
+  // ── Provider tells: opt-in via --gpt / --gemini (gated off by default) ──
+  {
+    id: 'gpt-thin-border-wide-shadow',
+    category: 'slop',
+    severity: 'advisory',
+    gated: 'gpt',
+    name: 'Hairline border with wide shadow',
+    description:
+      'A hairline border paired with a wide, diffuse shadow is a recurring generated-UI signature. Commit to one — a defined edge or a soft elevation — rather than both at once.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'hairline border plus wide diffuse shadow',
+  },
+  {
+    id: 'repeating-stripes-gradient',
+    category: 'slop',
+    severity: 'advisory',
+    gated: 'gpt',
+    name: 'Repeating-gradient stripes',
+    description:
+      'Repeating-gradient stripes used as surface decoration are a recurring generated-UI signature. Reach for a deliberate texture or leave the surface plain.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'repeating-gradient decorative stripes',
+  },
+  {
+    id: 'theater-slop-phrase',
+    category: 'slop',
+    severity: 'advisory',
+    gated: 'gpt',
+    name: 'Theater framing copy',
+    description:
+      'Dismissing something as "theater" is a recurring generated-copy tic. Say plainly what the thing does or does not do.',
+    skillSection: 'Copy',
+    skillGuideline: 'theater framing copy',
+  },
+  {
+    id: 'image-hover-transform',
+    category: 'slop',
+    severity: 'advisory',
+    gated: 'gemini',
+    name: 'Image hover transform',
+    description:
+      'Scaling or rotating an image on hover is a recurring generated-UI signature. Let imagery sit still, or use a subtler, purposeful interaction.',
+    skillSection: 'Motion',
+    skillGuideline: 'image scale or rotate on hover',
+  },
+];
+
+// --- cli/engine/shared/color.mjs ---
+// ─── Section 2: Color Utilities ─────────────────────────────────────────────
+
+function isNeutralColor(color) {
+  if (!color || color === 'transparent') return true;
+
+  // rgb/rgba — use channel spread. Threshold 30 ≈ 11.7% of the 0–255 range.
+  const rgb = color.match(/rgba?\((\d+),\s*(\d+),\s*(\d+)/);
+  if (rgb) {
+    return (Math.max(+rgb[1], +rgb[2], +rgb[3]) - Math.min(+rgb[1], +rgb[2], +rgb[3])) < 30;
+  }
+
+  // oklch()/lch() — chroma is the second numeric component.
+  // oklch chroma is ~0–0.4 in sRGB gamut; >= 0.02 reads as tinted, not gray.
+  // lch chroma is ~0–150; >= 3 reads as tinted. jsdom emits both formats
+  // literally (it does NOT convert them to rgb).
+  const oklch = color.match(/oklch\(\s*[\d.]+%?\s*([\d.-]+)/i);
+  if (oklch) return parseFloat(oklch[1]) < 0.02;
+  const lch = color.match(/lch\(\s*[\d.]+%?\s*([\d.-]+)/i);
+  if (lch) return parseFloat(lch[1]) < 3;
+
+  // oklab()/lab() — a and b are signed axes; chroma = sqrt(a² + b²).
+  // oklab a/b are ~-0.4..0.4, threshold 0.02. lab a/b are ~-128..127, threshold 3.
+  const oklab = color.match(/oklab\(\s*[\d.]+%?\s*([\d.-]+)\s+([\d.-]+)/i);
+  if (oklab) {
+    const a = parseFloat(oklab[1]), b = parseFloat(oklab[2]);
+    return Math.hypot(a, b) < 0.02;
+  }
+  const lab = color.match(/lab\(\s*[\d.]+%?\s*([\d.-]+)\s+([\d.-]+)/i);
+  if (lab) {
+    const a = parseFloat(lab[1]), b = parseFloat(lab[2]);
+    return Math.hypot(a, b) < 3;
+  }
+
+  // hsl/hsla — saturation is the second numeric component (percent).
+  // Modern jsdom usually converts hsl() to rgb, but handle it directly for
+  // safety across versions and for any engine that preserves the format.
+  const hsl = color.match(/hsla?\(\s*[\d.-]+\s*,?\s*([\d.]+)%/i);
+  if (hsl) return parseFloat(hsl[1]) < 10;
+
+  // hwb(hue whiteness% blackness%) — a pixel is fully gray when
+  // whiteness + blackness >= 100; chroma-like saturation = 1 - (w+b)/100.
+  const hwb = color.match(/hwb\(\s*[\d.-]+\s+([\d.]+)%\s+([\d.]+)%/i);
+  if (hwb) {
+    const w = parseFloat(hwb[1]), b = parseFloat(hwb[2]);
+    return (1 - Math.min(100, w + b) / 100) < 0.1;
+  }
+
+  // Unknown / unrecognized format — err on the side of DETECTING rather
+  // than silently skipping. This is the opposite of the previous default,
+  // which was the root cause of the oklch bug.
+  return false;
+}
+
+function parseRgb(color) {
+  if (!color || color === 'transparent') return null;
+  const m = color.match(/rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*([\d.]+))?\)/);
+  if (!m) return null;
+  return { r: +m[1], g: +m[2], b: +m[3], a: m[4] !== undefined ? +m[4] : 1 };
+}
+
+function relativeLuminance({ r, g, b }) {
+  const [rs, gs, bs] = [r / 255, g / 255, b / 255].map(c =>
+    c <= 0.03928 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4
+  );
+  return 0.2126 * rs + 0.7152 * gs + 0.0722 * bs;
+}
+
+function contrastRatio(c1, c2) {
+  const l1 = relativeLuminance(c1);
+  const l2 = relativeLuminance(c2);
+  return (Math.max(l1, l2) + 0.05) / (Math.min(l1, l2) + 0.05);
+}
+
+function parseGradientColors(bgImage) {
+  if (!bgImage || !bgImage.includes('gradient')) return [];
+  const colors = [];
+  for (const m of bgImage.matchAll(/rgba?\([^)]+\)/g)) {
+    const c = parseRgb(m[0]);
+    if (c) colors.push(c);
+  }
+  for (const m of bgImage.matchAll(/#([0-9a-f]{6}|[0-9a-f]{3})\b/gi)) {
+    const h = m[1];
+    if (h.length === 6) {
+      colors.push({ r: parseInt(h.slice(0,2),16), g: parseInt(h.slice(2,4),16), b: parseInt(h.slice(4,6),16), a: 1 });
+    } else {
+      colors.push({ r: parseInt(h[0]+h[0],16), g: parseInt(h[1]+h[1],16), b: parseInt(h[2]+h[2],16), a: 1 });
+    }
+  }
+  return colors;
+}
+
+function hasChroma(c, threshold = 30) {
+  if (!c) return false;
+  return (Math.max(c.r, c.g, c.b) - Math.min(c.r, c.g, c.b)) >= threshold;
+}
+
+function getHue(c) {
+  if (!c) return 0;
+  const r = c.r / 255, g = c.g / 255, b = c.b / 255;
+  const max = Math.max(r, g, b), min = Math.min(r, g, b);
+  if (max === min) return 0;
+  const d = max - min;
+  let h;
+  if (max === r) h = ((g - b) / d + (g < b ? 6 : 0)) / 6;
+  else if (max === g) h = ((b - r) / d + 2) / 6;
+  else h = ((r - g) / d + 4) / 6;
+  return Math.round(h * 360);
+}
+
+function colorToHex(c) {
+  if (!c) return '?';
+  return '#' + [c.r, c.g, c.b].map(v => v.toString(16).padStart(2, '0')).join('');
+}
+
+// --- cli/engine/rules/checks.mjs ---
+const DETECTOR_IS_BROWSER = typeof window !== 'undefined';
+
+// ─── Section 3: Pure Detection ──────────────────────────────────────────────
+
+function checkBorders(tag, widths, colors, radius) {
+  if (BORDER_SAFE_TAGS.has(tag)) return [];
+  const findings = [];
+  const sides = ['Top', 'Right', 'Bottom', 'Left'];
+
+  for (const side of sides) {
+    const w = widths[side];
+    if (w < 1 || isNeutralColor(colors[side])) continue;
+
+    const otherSides = sides.filter(s => s !== side);
+    const maxOther = Math.max(...otherSides.map(s => widths[s]));
+    if (!(w >= 2 && (maxOther <= 1 || w >= maxOther * 2))) continue;
+
+    const sn = side.toLowerCase();
+    const isSide = side === 'Left' || side === 'Right';
+
+    if (isSide) {
+      if (radius > 0) findings.push({ id: 'side-tab', snippet: `border-${sn}: ${w}px + border-radius: ${radius}px` });
+      else if (w >= 3) findings.push({ id: 'side-tab', snippet: `border-${sn}: ${w}px` });
+    } else {
+      if (radius > 0 && w >= 2) findings.push({ id: 'border-accent-on-rounded', snippet: `border-${sn}: ${w}px + border-radius: ${radius}px` });
+    }
+  }
+
+  return findings;
+}
+
+// Returns true if the given text is composed entirely of emoji characters
+// (plus whitespace / variation selectors). Emojis render as multicolor glyphs
+// regardless of CSS `color`, so contrast checks against the element's text
+// color are meaningless for these nodes.
+const EMOJI_CHAR_RE = /[\u{1F1E6}-\u{1F1FF}\u{1F300}-\u{1F9FF}\u{1FA00}-\u{1FAFF}\u{2600}-\u{27BF}\u{2300}-\u{23FF}\u{FE0F}\u{200D}\u{1F3FB}-\u{1F3FF}]/u;
+const EMOJI_CHARS_GLOBAL = /[\u{1F1E6}-\u{1F1FF}\u{1F300}-\u{1F9FF}\u{1FA00}-\u{1FAFF}\u{2600}-\u{27BF}\u{2300}-\u{23FF}\u{FE0F}\u{200D}\u{1F3FB}-\u{1F3FF}]/gu;
+function isEmojiOnlyText(text) {
+  if (!text) return false;
+  if (!EMOJI_CHAR_RE.test(text)) return false;
+  return text.replace(EMOJI_CHARS_GLOBAL, '').trim() === '';
+}
+
+function checkColors(opts) {
+  const { tag, textColor, bgColor, effectiveBg, effectiveBgStops, fontSize, fontWeight, hasDirectText, isEmojiOnly, bgClip, bgImage, classList } = opts;
+  if (SAFE_TAGS.has(tag)) {
+    // Exception for <a> and <button> elements styled as buttons. SAFE_TAGS
+    // exists to suppress contrast noise on inline links and unstyled controls,
+    // where the element has no own background and the contrast against the
+    // ancestor surface is already the intended visual. When the element has
+    // its own opaque background and direct text, it is a styled button — and
+    // contrast on its own surface is a real, frequent bug worth flagging.
+    const isStyledButton = (tag === 'a' || tag === 'button')
+      && hasDirectText
+      && bgColor && bgColor.a > 0.5;
+    if (!isStyledButton) return [];
+  }
+  const findings = [];
+
+  if (hasDirectText && textColor && !isEmojiOnly) {
+    // Run background-dependent checks against either a solid bg or, if the
+    // ancestor is a gradient, against every gradient stop (use the worst case).
+    const bgs = effectiveBg ? [effectiveBg] : (effectiveBgStops && effectiveBgStops.length ? effectiveBgStops : null);
+    if (bgs) {
+      // Gray on colored background — flag if every stop is chromatic
+      const textLum = relativeLuminance(textColor);
+      const isGray = !hasChroma(textColor, 20) && textLum > 0.05 && textLum < 0.85;
+      if (isGray && bgs.every(b => hasChroma(b, 40))) {
+        const bgLabel = effectiveBg ? colorToHex(effectiveBg) : `gradient(${bgs.map(colorToHex).join(', ')})`;
+        findings.push({ id: 'gray-on-color', snippet: `text ${colorToHex(textColor)} on bg ${bgLabel}` });
+      }
+
+      // Low contrast (WCAG AA) — worst case across all bg stops
+      const ratios = bgs.map(b => contrastRatio(textColor, b));
+      let worstIdx = 0;
+      for (let i = 1; i < ratios.length; i++) if (ratios[i] < ratios[worstIdx]) worstIdx = i;
+      const ratio = ratios[worstIdx];
+      const isLargeText = fontSize >= WCAG_LARGE_TEXT_PX || (fontSize >= WCAG_LARGE_BOLD_TEXT_PX && fontWeight >= 700);
+      const threshold = isLargeText ? 3.0 : 4.5;
+      if (ratio < threshold) {
+        // Skip the false-positive class where text has alpha < 1 AND we
+        // couldn't find an opaque ancestor (effectiveBg is null, we're
+        // comparing against gradient-stop fallback). In jsdom mode the
+        // detector can't resolve `var(--X)` color tokens, so a dark
+        // section sitting between the text and the body's decorative
+        // gradient is invisible to us — we end up measuring contrast
+        // against the body's paper-grain noise instead of the real
+        // local bg. Real low-contrast bugs use alpha=1 and have a
+        // resolvable opaque ancestor; semi-transparent Tailwind tokens
+        // like `text-paper/60` on `bg-ink` sections are the FP pattern.
+        const isAlphaFallbackFP = !DETECTOR_IS_BROWSER && !effectiveBg && (textColor.a != null && textColor.a < 1);
+        if (!isAlphaFallbackFP) {
+          findings.push({ id: 'low-contrast', snippet: `${ratio.toFixed(1)}:1 (need ${threshold}:1) — text ${colorToHex(textColor)} on ${colorToHex(bgs[worstIdx])}` });
+        }
+      }
+    }
+
+    // AI palette: purple/violet on headings
+    if (hasChroma(textColor, 50)) {
+      const hue = getHue(textColor);
+      if (hue >= 260 && hue <= 310 && (['h1', 'h2', 'h3'].includes(tag) || fontSize >= 20)) {
+        findings.push({ id: 'ai-color-palette', snippet: `Purple/violet text (${colorToHex(textColor)}) on heading` });
+      }
+    }
+  }
+
+  // Gradient text
+  if (bgClip === 'text' && bgImage && bgImage.includes('gradient')) {
+    findings.push({ id: 'gradient-text', snippet: 'background-clip: text + gradient' });
+  }
+
+  // Tailwind class checks
+  if (classList) {
+    const classStr = typeof classList === 'string' ? classList : Array.from(classList).join(' ');
+
+    const grayMatch = classStr.match(/\btext-(?:gray|slate|zinc|neutral|stone)-\d+\b/);
+    const colorBgMatch = classStr.match(/\bbg-(?:red|orange|amber|yellow|lime|green|emerald|teal|cyan|sky|blue|indigo|violet|purple|fuchsia|pink|rose)-\d+\b/);
+    if (grayMatch && colorBgMatch) {
+      findings.push({ id: 'gray-on-color', snippet: `${grayMatch[0]} on ${colorBgMatch[0]}` });
+    }
+
+    if (/\bbg-clip-text\b/.test(classStr) && /\bbg-gradient-to-/.test(classStr)) {
+      findings.push({ id: 'gradient-text', snippet: 'bg-clip-text + bg-gradient (Tailwind)' });
+    }
+
+    const purpleText = classStr.match(/\btext-(?:purple|violet|indigo)-\d+\b/);
+    if (purpleText && (['h1', 'h2', 'h3'].includes(tag) || /\btext-(?:[2-9]xl)\b/.test(classStr))) {
+      findings.push({ id: 'ai-color-palette', snippet: `${purpleText[0]} on heading` });
+    }
+
+    if (/\bfrom-(?:purple|violet|indigo)-\d+\b/.test(classStr) && /\bto-(?:purple|violet|indigo|blue|cyan|pink|fuchsia)-\d+\b/.test(classStr)) {
+      findings.push({ id: 'ai-color-palette', snippet: 'Purple/violet gradient (Tailwind)' });
+    }
+  }
+
+  return findings;
+}
+
+function isCardLikeFromProps(hasShadow, hasBorder, hasRadius, hasBg) {
+  if (!hasShadow && !hasBorder) return false;
+  return hasRadius || hasBg;
+}
+
+const HEADING_TAGS = new Set(['h1', 'h2', 'h3', 'h4', 'h5', 'h6']);
+
+// Pure check: given a heading and metrics about its previousElementSibling,
+// decide if the sibling is the canonical "icon-tile-stacked-above-heading" shape.
+//
+// Triggers when ALL of the following hold for the sibling:
+//   • size 32–128px on both axes (not too small, not a hero image)
+//   • aspect ratio 0.7–1.4 (squarish — excludes wide thumbnails / pill badges)
+//   • has a non-transparent background-color, background-image, OR a visible border
+//     (covers solid colors, white-with-border, gradients — anything that visually
+//      defines a tile)
+//   • border-radius < width/2 (excludes round avatars; rounded squares pass)
+//   • contains an <svg> or icon-class <i> element that's smaller than the tile
+//   • the tile sits above the heading (its bottom is above the heading's top)
+function checkIconTile(opts) {
+  const { headingTag, headingText, headingTop,
+          siblingTag, siblingWidth, siblingHeight, siblingBottom,
+          siblingBgColor, siblingBgImage, siblingBorderWidth, siblingBorderRadius,
+          hasIconChild, iconChildWidth } = opts;
+  if (!HEADING_TAGS.has(headingTag)) return [];
+  if (!siblingTag) return [];
+  // Don't recurse into nested headings (e.g. h2 above h3 in a section header)
+  if (HEADING_TAGS.has(siblingTag)) return [];
+
+  // Size window: 32–128px on each axis
+  if (!(siblingWidth >= 32 && siblingWidth <= 128)) return [];
+  if (!(siblingHeight >= 32 && siblingHeight <= 128)) return [];
+
+  // Squarish aspect ratio
+  const ratio = siblingWidth / siblingHeight;
+  if (ratio < 0.7 || ratio > 1.4) return [];
+
+  // Must have something that visually defines the tile
+  const bgVisible = (siblingBgColor && siblingBgColor.a > 0.1)
+    || (siblingBgImage && siblingBgImage !== 'none' && siblingBgImage !== '');
+  const borderVisible = siblingBorderWidth > 0;
+  if (!bgVisible && !borderVisible) return [];
+
+  // Exclude circles (avatars). Rounded squares pass.
+  if (siblingBorderRadius >= siblingWidth / 2) return [];
+
+  // Must contain an icon element smaller than the tile
+  if (!hasIconChild) return [];
+  if (iconChildWidth && iconChildWidth >= siblingWidth * 0.95) return [];
+
+  // Vertical stacking: tile must end above where the heading starts.
+  // (Allow the check to skip when both top/bottom are 0 — jsdom layout case.)
+  if (headingTop && siblingBottom && siblingBottom > headingTop + 4) return [];
+
+  const text = (headingText || '').trim().slice(0, 60);
+  return [{
+    id: 'icon-tile-stack',
+    snippet: `${Math.round(siblingWidth)}x${Math.round(siblingHeight)}px icon tile above ${headingTag} "${text}"`,
+  }];
+}
+
+// Resolve the primary (non-generic) face from a font-family string and return
+// whether the resolved primary is serif. Two paths:
+//   1. Primary face is in KNOWN_SERIF_FONTS → serif.
+//   2. Primary face is unknown but the stack ends in the generic `serif`
+//      token → treat as serif. Authors who declare `font-family: 'X', serif`
+//      almost always have a serif primary; a sans declared with a serif
+//      fallback is a code smell, not the common case.
+// Returns { primary, isSerif } so the snippet can name the face.
+function resolveSerif(fontFamily) {
+  if (!fontFamily) return { primary: null, isSerif: false };
+  const tokens = fontFamily.split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase());
+  const primary = tokens.find(f => f && !GENERIC_FONTS.has(f)) || null;
+  if (!primary) return { primary: null, isSerif: false };
+  if (KNOWN_SERIF_FONTS.has(primary)) return { primary, isSerif: true };
+  if (tokens.includes('serif')) return { primary, isSerif: true };
+  return { primary, isSerif: false };
+}
+
+function checkItalicSerif(opts) {
+  const { tag, fontStyle, fontFamily, fontSize, headingText } = opts;
+  if (fontStyle !== 'italic') return [];
+  // Anchor the rule on hero-scale text. h1 is the canonical hero element;
+  // h2 ≥ 48px catches the cases where the design demotes the visual hero
+  // to an h2 but keeps the size.
+  if (tag !== 'h1' && !(tag === 'h2' && fontSize >= 48)) return [];
+  if (fontSize < 48) return [];
+  const { primary, isSerif } = resolveSerif(fontFamily);
+  if (!isSerif) return [];
+
+  const text = (headingText || '').trim().slice(0, 60);
+  return [{
+    id: 'italic-serif-display',
+    snippet: `italic serif ${tag} (${primary || 'serif'}) at ${Math.round(fontSize)}px "${text}"`,
+  }];
+}
+
+// Color saturation check. Returns true when the color has visible
+// chroma — i.e., it's an "accent color" rather than near-neutral.
+// Handles rgb()/rgba(), #hex, oklch(), and hsl(). var() refs are
+// expected to be pre-resolved by the caller.
+function isAccentColor(cssColor) {
+  if (!cssColor) return false;
+  const s = String(cssColor).trim();
+  // rgb / rgba — direct channel-distance check.
+  const rgbM = /rgba?\(\s*(\d+)\s*,?\s+|\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)/.exec(s.replace(/rgba?\(\s*/, 'rgb(').replace(/,/g, ', '));
+  const rgbStrict = /rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)/.exec(s);
+  if (rgbStrict) {
+    const r = +rgbStrict[1], g = +rgbStrict[2], b = +rgbStrict[3];
+    return (Math.max(r, g, b) - Math.min(r, g, b)) >= 40;
+  }
+  // #hex — 3, 4, 6, or 8 digit.
+  const hexM = /^#([0-9a-f]{3,8})\b/i.exec(s);
+  if (hexM) {
+    let h = hexM[1];
+    if (h.length === 3 || h.length === 4) h = h.split('').map((c) => c + c).join('').slice(0, 6);
+    else h = h.slice(0, 6);
+    if (h.length === 6) {
+      const r = parseInt(h.slice(0, 2), 16);
+      const g = parseInt(h.slice(2, 4), 16);
+      const b = parseInt(h.slice(4, 6), 16);
+      return (Math.max(r, g, b) - Math.min(r, g, b)) >= 40;
+    }
+  }
+  // oklch(L C H) — chroma C is what matters. Typical neutral grays
+  // have C < 0.02; visible accents are 0.05+. CSS minification can
+  // collapse spaces between L% and C ("oklch(43%.15 34)"), so we
+  // extract all numbers and take the second rather than matching a
+  // strict L-then-whitespace-then-C pattern.
+  if (/^oklch\(/i.test(s)) {
+    const nums = s.match(/\d*\.\d+|\d+/g);
+    if (nums && nums.length >= 2) {
+      const c = parseFloat(nums[1]);
+      return !Number.isNaN(c) && c >= 0.05;
+    }
+  }
+  // hsl(H, S%, L%) — saturation > 20% reads as accent.
+  const hslM = /hsla?\(\s*[\d.]+\s*,\s*([\d.]+)%/i.exec(s);
+  if (hslM) {
+    const sat = parseFloat(hslM[1]);
+    return !Number.isNaN(sat) && sat >= 20;
+  }
+  return false;
+}
+
+// Sibling-relationship rule. Anchor on a hero-scale h1, look at the
+// previousElementSibling, and gate on EITHER the classic tracked-
+// uppercase eyebrow OR the modern accent-colored bold eyebrow.
+function checkHeroEyebrow(opts) {
+  const {
+    headingTag, headingText, headingFontSize,
+    siblingTag, siblingText, siblingTextTransform,
+    siblingFontSize, siblingLetterSpacing,
+    siblingFontWeight, siblingColor,
+  } = opts;
+  if (headingTag !== 'h1') return [];
+  // We previously gated on headingFontSize >= 48 to anchor "hero scale".
+  // But modern hero h1s use clamp() / vw / var(--text-*), none of which
+  // jsdom can resolve — the computed value comes back as "2em" or
+  // "var(--text-9xl)" and parseFloat returns 2 or NaN. The gate fails
+  // on virtually every Tailwind v4 / framework build. The other gates
+  // (sibling text 2-60 chars, font-size ≤ 14px, accent-bold OR
+  // tracked-caps) are tight enough to avoid false positives on non-
+  // hero h1s — a tiny tan label directly above any h1 is the
+  // antipattern regardless of how big the h1 ends up.
+  if (!siblingTag) return [];
+  // An h2 above an h1 is a different anti-pattern (heading hierarchy / dual
+  // headings) — never an eyebrow.
+  if (HEADING_TAGS.has(siblingTag)) return [];
+
+  const text = (siblingText || '').trim();
+  if (text.length < 2 || text.length > 60) return [];
+  if (!(siblingFontSize > 0 && siblingFontSize <= 14)) return [];
+
+  // Branch A: classic tracked-uppercase eyebrow.
+  const isUppercased = siblingTextTransform === 'uppercase'
+    || (/[A-Z]/.test(text) && !/[a-z]/.test(text));
+  const isClassicTracked = isUppercased && siblingLetterSpacing >= 1.6;
+
+  // Branch B: modern accent-bold eyebrow — sentence case, low
+  // tracking, but bold + accent-colored. The style choices changed;
+  // the pattern is the same kicker-above-headline anti-pattern.
+  const weight = Number(siblingFontWeight) || 400;
+  const isAccentBold = weight >= 700 && isAccentColor(siblingColor || '');
+
+  if (!isClassicTracked && !isAccentBold) return [];
+
+  const headingTextSnippet = (headingText || '').trim().slice(0, 60);
+  const eyebrowSnippet = text.slice(0, 40);
+  const style = isClassicTracked ? 'tracked-caps' : 'accent-bold';
+  return [{
+    id: 'hero-eyebrow-chip',
+    snippet: `eyebrow chip (${style}) "${eyebrowSnippet}" above ${headingTag} "${headingTextSnippet}"`,
+  }];
+}
+
+function checkRepeatedSectionKickers(opts) {
+  const { candidates, minCount = 3 } = opts;
+  if (!Array.isArray(candidates) || candidates.length < minCount) return [];
+  return candidates.map(candidate => ({
+    id: 'repeated-section-kickers',
+    snippet: `repeated section kicker "${candidate.kickerText}" before ${candidate.headingTag} "${candidate.headingText}" (${candidates.length} on page)`,
+  }));
+}
+
+const LAYOUT_TRANSITION_PROPS = new Set([
+  'width', 'height', 'padding', 'margin',
+  'max-height', 'max-width', 'min-height', 'min-width',
+  'padding-top', 'padding-right', 'padding-bottom', 'padding-left',
+  'margin-top', 'margin-right', 'margin-bottom', 'margin-left',
+]);
+
+function checkMotion(opts) {
+  const { tag, transitionProperty, animationName, timingFunctions, classList } = opts;
+  if (SAFE_TAGS.has(tag)) return [];
+  const findings = [];
+
+  // --- Bounce/elastic easing ---
+  if (animationName && animationName !== 'none' && /bounce|elastic|wobble|jiggle|spring/i.test(animationName)) {
+    findings.push({ id: 'bounce-easing', snippet: `animation: ${animationName}` });
+  }
+  if (classList && /\banimate-bounce\b/.test(classList)) {
+    findings.push({ id: 'bounce-easing', snippet: 'animate-bounce (Tailwind)' });
+  }
+
+  // Check timing functions for overshoot cubic-bezier (y values outside [0, 1])
+  if (timingFunctions) {
+    const bezierRe = /cubic-bezier\(\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*\)/g;
+    let m;
+    while ((m = bezierRe.exec(timingFunctions)) !== null) {
+      const y1 = parseFloat(m[2]), y2 = parseFloat(m[4]);
+      if (y1 < -0.1 || y1 > 1.1 || y2 < -0.1 || y2 > 1.1) {
+        findings.push({ id: 'bounce-easing', snippet: `cubic-bezier(${m[1]}, ${m[2]}, ${m[3]}, ${m[4]})` });
+        break;
+      }
+    }
+  }
+
+  // --- Layout property transition ---
+  if (transitionProperty && transitionProperty !== 'all' && transitionProperty !== 'none') {
+    const props = transitionProperty.split(',').map(p => p.trim().toLowerCase());
+    const layoutFound = props.filter(p => LAYOUT_TRANSITION_PROPS.has(p));
+    if (layoutFound.length > 0) {
+      findings.push({ id: 'layout-transition', snippet: `transition: ${layoutFound.join(', ')}` });
+    }
+  }
+
+  return findings;
+}
+
+function checkGlow(opts) {
+  const { boxShadow, effectiveBg } = opts;
+  if (!boxShadow || boxShadow === 'none') return [];
+  if (!effectiveBg) return [];
+
+  // Only flag on dark backgrounds (luminance < 0.1)
+  const bgLum = relativeLuminance(effectiveBg);
+  if (bgLum >= 0.1) return [];
+
+  // Split multiple shadows (commas not inside parentheses)
+  const parts = boxShadow.split(/,(?![^(]*\))/);
+  for (const shadow of parts) {
+    const colorMatch = shadow.match(/rgba?\([^)]+\)/);
+    if (!colorMatch) continue;
+    const color = parseRgb(colorMatch[0]);
+    if (!color || !hasChroma(color, 30)) continue;
+
+    // Extract px values — in computed style: "color Xpx Ypx BLURpx [SPREADpx]"
+    const afterColor = shadow.substring(shadow.indexOf(colorMatch[0]) + colorMatch[0].length);
+    const beforeColor = shadow.substring(0, shadow.indexOf(colorMatch[0]));
+    const pxVals = [...beforeColor.matchAll(/([\d.]+)px/g), ...afterColor.matchAll(/([\d.]+)px/g)]
+      .map(m => parseFloat(m[1]));
+
+    // Third value is blur (offset-x, offset-y, blur, [spread])
+    if (pxVals.length >= 3 && pxVals[2] > 4) {
+      return [{ id: 'dark-glow', snippet: `Colored glow (${colorToHex(color)}) on dark background` }];
+    }
+  }
+
+  return [];
+}
+
+/**
+ * Regex-on-HTML checks shared between browser and Node page-level detection.
+ * These don't need DOM access, just the raw HTML string.
+ */
+function checkHtmlPatterns(html) {
+  const findings = [];
+
+  // --- Color ---
+
+  // AI color palette: purple/violet
+  const purpleHexRe = /#(?:7c3aed|8b5cf6|a855f7|9333ea|7e22ce|6d28d9|6366f1|764ba2|667eea)\b/gi;
+  if (purpleHexRe.test(html)) {
+    const purpleTextRe = /(?:(?:^|;)\s*color\s*:\s*(?:.*?)(?:#(?:7c3aed|8b5cf6|a855f7|9333ea|7e22ce|6d28d9))|gradient.*?#(?:7c3aed|8b5cf6|a855f7|764ba2|667eea))/gi;
+    if (purpleTextRe.test(html)) {
+      findings.push({ id: 'ai-color-palette', snippet: 'Purple/violet accent colors detected' });
+    }
+  }
+
+  // Gradient text (background-clip: text + gradient)
+  const gradientRe = /(?:-webkit-)?background-clip\s*:\s*text/gi;
+  let gm;
+  while ((gm = gradientRe.exec(html)) !== null) {
+    const start = Math.max(0, gm.index - 200);
+    const context = html.substring(start, gm.index + gm[0].length + 200);
+    if (/gradient/i.test(context)) {
+      findings.push({ id: 'gradient-text', snippet: 'background-clip: text + gradient' });
+      break;
+    }
+  }
+  if (/\bbg-clip-text\b/.test(html) && /\bbg-gradient-to-/.test(html)) {
+    findings.push({ id: 'gradient-text', snippet: 'bg-clip-text + bg-gradient (Tailwind)' });
+  }
+
+  // --- Layout ---
+
+  // Monotonous spacing
+  const spacingValues = [];
+  const spacingRe = /(?:padding|margin)(?:-(?:top|right|bottom|left))?\s*:\s*(\d+)px/gi;
+  let sm;
+  while ((sm = spacingRe.exec(html)) !== null) {
+    const v = parseInt(sm[1], 10);
+    if (v > 0 && v < 200) spacingValues.push(v);
+  }
+  const gapRe = /gap\s*:\s*(\d+)px/gi;
+  while ((sm = gapRe.exec(html)) !== null) {
+    spacingValues.push(parseInt(sm[1], 10));
+  }
+  const twSpaceRe = /\b(?:p|px|py|pt|pb|pl|pr|m|mx|my|mt|mb|ml|mr|gap)-(\d+)\b/g;
+  while ((sm = twSpaceRe.exec(html)) !== null) {
+    spacingValues.push(parseInt(sm[1], 10) * 4);
+  }
+  const remSpacingRe = /(?:padding|margin)(?:-(?:top|right|bottom|left))?\s*:\s*([\d.]+)rem/gi;
+  while ((sm = remSpacingRe.exec(html)) !== null) {
+    const v = Math.round(parseFloat(sm[1]) * 16);
+    if (v > 0 && v < 200) spacingValues.push(v);
+  }
+  const roundedSpacing = spacingValues.map(v => Math.round(v / 4) * 4);
+  if (roundedSpacing.length >= 10) {
+    const counts = {};
+    for (const v of roundedSpacing) counts[v] = (counts[v] || 0) + 1;
+    const maxCount = Math.max(...Object.values(counts));
+    const dominantPct = maxCount / roundedSpacing.length;
+    const unique = [...new Set(roundedSpacing)].filter(v => v > 0);
+    if (dominantPct > 0.6 && unique.length <= 3) {
+      const dominant = Object.entries(counts).sort((a, b) => b[1] - a[1])[0][0];
+      findings.push({
+        id: 'monotonous-spacing',
+        snippet: `~${dominant}px used ${maxCount}/${roundedSpacing.length} times (${Math.round(dominantPct * 100)}%)`,
+      });
+    }
+  }
+
+  // --- Motion ---
+
+  // Bounce/elastic animation names
+  const bounceRe = /animation(?:-name)?\s*:\s*([^;{}]*(?:bounce|elastic|wobble|jiggle|spring)[^;{}]*)/gi;
+  const bounceMatch = bounceRe.exec(html);
+  if (bounceMatch) {
+    const animationToken = bounceMatch[1]
+      .split(/[,\s]+/)
+      .find((part) => /bounce|elastic|wobble|jiggle|spring/i.test(part));
+    findings.push({ id: 'bounce-easing', snippet: `animation: ${animationToken || bounceMatch[1].trim()}` });
+  }
+
+  // Overshoot cubic-bezier
+  const bezierRe = /cubic-bezier\(\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*\)/g;
+  let bm;
+  while ((bm = bezierRe.exec(html)) !== null) {
+    const y1 = parseFloat(bm[2]), y2 = parseFloat(bm[4]);
+    if (y1 < -0.1 || y1 > 1.1 || y2 < -0.1 || y2 > 1.1) {
+      findings.push({ id: 'bounce-easing', snippet: `cubic-bezier(${bm[1]}, ${bm[2]}, ${bm[3]}, ${bm[4]})` });
+      break;
+    }
+  }
+
+  // Layout property transitions
+  const transRe = /transition(?:-property)?\s*:\s*([^;{}]+)/gi;
+  let tm;
+  while ((tm = transRe.exec(html)) !== null) {
+    const val = tm[1].toLowerCase();
+    if (/\ball\b/.test(val)) continue;
+    const found = val.match(/\b(?:(?:max|min)-)?(?:width|height)\b|\bpadding(?:-(?:top|right|bottom|left))?\b|\bmargin(?:-(?:top|right|bottom|left))?\b/gi);
+    if (found) {
+      findings.push({ id: 'layout-transition', snippet: `transition: ${found.join(', ')}` });
+      break;
+    }
+  }
+
+  // --- Dark glow ---
+
+  const darkBgRe = /background(?:-color)?\s*:\s*(?:#(?:0[0-9a-f]|1[0-9a-f]|2[0-3])[0-9a-f]{4}\b|#(?:0|1)[0-9a-f]{2}\b|rgb\(\s*(\d{1,2})\s*,\s*(\d{1,2})\s*,\s*(\d{1,2})\s*\))/gi;
+  const twDarkBg = /\bbg-(?:gray|slate|zinc|neutral|stone)-(?:9\d{2}|800)\b/;
+  if (darkBgRe.test(html) || twDarkBg.test(html)) {
+    const shadowRe = /box-shadow\s*:\s*([^;{}]+)/gi;
+    let shm;
+    while ((shm = shadowRe.exec(html)) !== null) {
+      const val = shm[1];
+      const colorMatch = val.match(/rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)/);
+      if (!colorMatch) continue;
+      const [r, g, b] = [+colorMatch[1], +colorMatch[2], +colorMatch[3]];
+      if ((Math.max(r, g, b) - Math.min(r, g, b)) < 30) continue;
+      const pxVals = [...val.matchAll(/(\d+)px|(?<![.\d])\b(0)\b(?![.\d])/g)].map(p => +(p[1] || p[2]));
+      if (pxVals.length >= 3 && pxVals[2] > 4) {
+        findings.push({ id: 'dark-glow', snippet: `Colored glow (rgb(${r},${g},${b})) on dark page` });
+        break;
+      }
+    }
+  }
+
+  // --- Provider tells (gated): repeating-gradient stripes (GPT) ---
+  if (/repeating-(?:linear|radial|conic)-gradient\s*\(/i.test(html)) {
+    findings.push({ id: 'repeating-stripes-gradient', snippet: 'repeating-gradient decorative stripes' });
+  }
+
+  // --- Provider tells (gated): "X theater" framing copy (GPT) ---
+  // Lives here (regex-on-HTML) rather than in the text-content analyzers so it
+  // runs in the bundled browser path too, not just the CLI/static path.
+  {
+    const bodyText = html
+      .replace(/<script\b[^>]*>[\s\S]*?<\/script>/gi, ' ')
+      .replace(/<style\b[^>]*>[\s\S]*?<\/style>/gi, ' ')
+      .replace(/<[^>]+>/g, ' ');
+    const tm = /\b(\w+)\s+theater\b/i.exec(bodyText);
+    if (tm) findings.push({ id: 'theater-slop-phrase', snippet: `"${tm[0].trim()}"` });
+  }
+
+  // --- Provider tells (gated): image hover transform (Gemini) ---
+  // A CSS `img...:hover { transform: ... }` rule, or a Tailwind hover:scale /
+  // hover:rotate / hover:translate utility on an <img>. Each distinct
+  // mechanism is its own finding.
+  const imgHoverCss = /\bimg\b[^,{}]*:hover\b[^{}]*\{[^}]*\btransform\s*:\s*(?:scale|rotate|translate|matrix|skew)/i;
+  if (imgHoverCss.test(html)) {
+    findings.push({ id: 'image-hover-transform', snippet: 'img:hover { transform } rule' });
+  }
+  const imgTagRe = /<img\b[^>]*\bclass\s*=\s*"([^"]*)"/gi;
+  let im;
+  while ((im = imgTagRe.exec(html)) !== null) {
+    if (/\bhover:(?:scale|rotate|translate|skew)-/.test(im[1])) {
+      findings.push({ id: 'image-hover-transform', snippet: 'Tailwind hover transform on <img>' });
+    }
+  }
+
+  return findings;
+}
+
+// ─── Section 4: resolveBackground (unified) ─────────────────────────────────
+
+// Read the element's own background color, computed-style first, with a
+// jsdom-friendly fallback that parses the inline `background:` shorthand
+// from the raw style attribute. jsdom (~v29) does not decompose the
+// shorthand into `backgroundColor`, so without this fallback the CLI silently
+// returns null for any element styled via `background: rgb(...)` or
+// `background: #abc`. Real browsers always decompose, so the fallback is
+// a no-op there.
+function readOwnBackgroundColor(el, computedStyle) {
+  const bg = parseRgb(computedStyle.backgroundColor);
+  if (DETECTOR_IS_BROWSER || (bg && bg.a >= 0.1)) return bg;
+  const rawStyle = el.getAttribute?.('style') || '';
+  const bgMatch = rawStyle.match(/background(?:-color)?\s*:\s*([^;]+)/i);
+  const inlineBg = bgMatch ? bgMatch[1].trim() : '';
+  if (!inlineBg) return bg;
+  if (/gradient/i.test(inlineBg) || /url\s*\(/i.test(inlineBg)) return bg;
+  const fromRgb = parseRgb(inlineBg);
+  if (fromRgb) return fromRgb;
+  const hexMatch = inlineBg.match(/#([0-9a-f]{6}|[0-9a-f]{3})\b/i);
+  if (hexMatch) {
+    const h = hexMatch[1];
+    if (h.length === 6) {
+      return { r: parseInt(h.slice(0, 2), 16), g: parseInt(h.slice(2, 4), 16), b: parseInt(h.slice(4, 6), 16), a: 1 };
+    }
+    return { r: parseInt(h[0] + h[0], 16), g: parseInt(h[1] + h[1], 16), b: parseInt(h[2] + h[2], 16), a: 1 };
+  }
+  return bg;
+}
+
+function resolveBackground(el, win, customPropMap) {
+  let current = el;
+  while (current && current.nodeType === 1) {
+    const style = DETECTOR_IS_BROWSER ? getComputedStyle(current) : win.getComputedStyle(current);
+    const bgImage = style.backgroundImage || '';
+    const hasGradientOrUrl = bgImage && bgImage !== 'none' && (/gradient/i.test(bgImage) || /url\s*\(/i.test(bgImage));
+
+    // Try the solid bg-color FIRST. If the element has both a solid color
+    // and a gradient/url overlay (a common pattern: `background: var(--paper)
+    // radial-gradient(...)` for paper-grain texture), the solid color is the
+    // dominant visible surface for contrast purposes; the overlay is
+    // decorative. The old behavior bailed on any gradient ancestor, which
+    // caused massive false-positive contrast findings on grain-textured
+    // body backgrounds.
+    let bg = parseRgb(style.backgroundColor);
+    if (!DETECTOR_IS_BROWSER && (!bg || bg.a < 0.1)) {
+      // jsdom returns literal "var(--X)" / "oklch(...)" strings. Resolve
+      // through customPropMap so Tailwind v4 color tokens become RGB.
+      if (customPropMap) {
+        bg = parseColorResolved(style.backgroundColor, customPropMap);
+      }
+      if (!bg || bg.a < 0.1) {
+        // Inline-style fallback. jsdom doesn't decompose background
+        // shorthand, so colors set via inline style are otherwise invisible.
+        const rawStyle = current.getAttribute?.('style') || '';
+        const bgMatch = rawStyle.match(/background(?:-color)?\s*:\s*([^;]+)/i);
+        const inlineBg = bgMatch ? bgMatch[1].trim() : '';
+        if (inlineBg && !/gradient/i.test(inlineBg) && !/url\s*\(/i.test(inlineBg)) {
+          bg = parseColorResolved(inlineBg, customPropMap) || parseAnyColor(inlineBg);
+        }
+      }
+    }
+
+    if (bg && bg.a > 0.1) {
+      if (DETECTOR_IS_BROWSER || bg.a >= 0.5) return bg;
+    }
+    // No solid bg-color at this level. If THIS level has a gradient/url
+    // with no underlying solid color we can read:
+    //   • on body/html: assume white. Body-level gradients are almost
+    //     always decorative texture (paper grain, noise) on top of a
+    //     solid bg-color the page set via `background: var(--paper)`
+    //     shorthand — which jsdom can't decompose into bg-color. The
+    //     downstream gradient-stops fallback path produces catastrophic
+    //     false positives in this case (gradient noise stops have
+    //     accidental browns/blacks that look like card backgrounds).
+    //   • on other elements: bail to null and let the caller fall back
+    //     to gradient stops (gradient buttons / hero sections are real
+    //     bgs worth checking against).
+    if (hasGradientOrUrl) {
+      if (current.tagName === 'BODY' || current.tagName === 'HTML') {
+        return { r: 255, g: 255, b: 255, a: 1 };
+      }
+      return null;
+    }
+    current = current.parentElement;
+  }
+  return { r: 255, g: 255, b: 255 };
+}
+
+// Walk parents looking for a gradient background and return its color stops.
+// Used as a fallback when resolveBackground() returns null because the
+// effective background is a gradient (no single solid color to compare against).
+function resolveGradientStops(el, win) {
+  let current = el;
+  while (current && current.nodeType === 1) {
+    const style = DETECTOR_IS_BROWSER ? getComputedStyle(current) : win.getComputedStyle(current);
+    const bgImage = style.backgroundImage || '';
+    if (bgImage && bgImage !== 'none' && /gradient/i.test(bgImage)) {
+      const stops = parseGradientColors(bgImage);
+      if (stops.length > 0) return stops;
+    }
+    if (!DETECTOR_IS_BROWSER) {
+      // jsdom doesn't decompose `background:` shorthand — peek at the raw inline style
+      const rawStyle = current.getAttribute?.('style') || '';
+      const bgMatch = rawStyle.match(/background(?:-image)?\s*:\s*([^;]+)/i);
+      if (bgMatch && /gradient/i.test(bgMatch[1])) {
+        const stops = parseGradientColors(bgMatch[1]);
+        if (stops.length > 0) return stops;
+      }
+    }
+    current = current.parentElement;
+  }
+  return null;
+}
+
+// Parse a single CSS length token to pixels. Accepts "12px", "50%", a
+// shorthand like "12px 4px" (uses the first value), or empty / null.
+// Returns the pixel value, or null when the input is unparseable.
+// Percentages convert against `widthPx` when one is supplied. Without a
+// usable width (jsdom returns "auto" for many real-world elements,
+// which parseFloat collapses to 0), fall back to the raw percentage
+// number so callers gating on `> 0` (border-accent-on-rounded,
+// isCardLike's hasRadius) still see a positive value, matching the
+// original parseFloat("50%") === 50 behavior.
+function parseRadiusToPx(value, widthPx) {
+  if (!value || typeof value !== 'string') return null;
+  const trimmed = value.trim();
+  if (!trimmed) return null;
+  const first = trimmed.split(/\s+/)[0];
+  const num = parseFloat(first);
+  if (Number.isNaN(num)) return null;
+  if (/%$/.test(first)) {
+    if (widthPx && widthPx > 0) return (num / 100) * widthPx;
+    return num;
+  }
+  return num;
+}
+
+function resolveBorderRadiusPx(el, style, widthPx, win) {
+  const fromComputed = parseRadiusToPx(style.borderRadius, widthPx);
+  if (fromComputed !== null) return fromComputed;
+  return 0;
+}
+
+// ─── Section 5: Element Adapters ────────────────────────────────────────────
+
+// Browser adapters — call getComputedStyle/getBoundingClientRect on live DOM
+
+function checkElementBordersDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (BORDER_SAFE_TAGS.has(tag)) return [];
+  const rect = el.getBoundingClientRect();
+  if (rect.width < 20 || rect.height < 20) return [];
+  const style = getComputedStyle(el);
+  const sides = ['Top', 'Right', 'Bottom', 'Left'];
+  const widths = {}, colors = {};
+  for (const s of sides) {
+    widths[s] = parseFloat(style[`border${s}Width`]) || 0;
+    colors[s] = style[`border${s}Color`] || '';
+  }
+  return checkBorders(tag, widths, colors, parseFloat(style.borderRadius) || 0);
+}
+
+function checkElementColorsDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  // No early SAFE_TAGS bail here — checkColors() does its own gating that
+  // includes the styled-button exception for <a> / <button> with their own
+  // opaque background. Bailing here would prevent that exception from firing.
+  const rect = el.getBoundingClientRect();
+  if (rect.width < 10 || rect.height < 10) return [];
+  const style = getComputedStyle(el);
+  const directText = [...el.childNodes].filter(n => n.nodeType === 3).map(n => n.textContent).join('');
+  const hasDirectText = directText.trim().length > 0;
+  const effectiveBg = resolveBackground(el);
+  return checkColors({
+    tag,
+    textColor: parseRgb(style.color),
+    bgColor: readOwnBackgroundColor(el, style),
+    effectiveBg,
+    effectiveBgStops: effectiveBg ? null : resolveGradientStops(el),
+    fontSize: parseFloat(style.fontSize) || 16,
+    fontWeight: parseInt(style.fontWeight) || 400,
+    hasDirectText,
+    isEmojiOnly: isEmojiOnlyText(directText),
+    bgClip: style.webkitBackgroundClip || style.backgroundClip || '',
+    bgImage: style.backgroundImage || '',
+    classList: el.getAttribute('class') || '',
+  });
+}
+
+function checkElementIconTileDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (!HEADING_TAGS.has(tag)) return [];
+  const sibling = el.previousElementSibling;
+  if (!sibling) return [];
+
+  const sibRect = sibling.getBoundingClientRect();
+  const headRect = el.getBoundingClientRect();
+  const sibStyle = getComputedStyle(sibling);
+
+  // The tile may either contain an <svg>/<i> icon child, OR the tile itself
+  // may contain an emoji/symbol character directly as its only text content
+  // (the "card-icon" pattern from many AI-generated demos).
+  const iconChild = sibling.querySelector('svg, i[data-lucide], i[class*="fa-"], i[class*="icon"]');
+  const iconRect = iconChild?.getBoundingClientRect();
+  const sibDirectText = [...sibling.childNodes].filter(n => n.nodeType === 3).map(n => n.textContent).join('');
+  const hasInlineEmojiIcon = sibling.children.length === 0 && isEmojiOnlyText(sibDirectText);
+
+  return checkIconTile({
+    headingTag: tag,
+    headingText: el.textContent || '',
+    headingTop: headRect.top,
+    siblingTag: sibling.tagName.toLowerCase(),
+    siblingWidth: sibRect.width,
+    siblingHeight: sibRect.height,
+    siblingBottom: sibRect.bottom,
+    siblingBgColor: parseRgb(sibStyle.backgroundColor),
+    siblingBgImage: sibStyle.backgroundImage || '',
+    siblingBorderWidth: parseFloat(sibStyle.borderTopWidth) || 0,
+    siblingBorderRadius: parseFloat(sibStyle.borderRadius) || 0,
+    hasIconChild: !!iconChild || hasInlineEmojiIcon,
+    iconChildWidth: iconRect?.width || 0,
+  });
+}
+
+function checkElementItalicSerifDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (tag !== 'h1' && tag !== 'h2') return [];
+  const style = getComputedStyle(el);
+  return checkItalicSerif({
+    tag,
+    fontStyle: style.fontStyle || '',
+    fontFamily: style.fontFamily || '',
+    fontSize: parseFloat(style.fontSize) || 0,
+    headingText: el.textContent || '',
+  });
+}
+
+function checkElementHeroEyebrowDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (tag !== 'h1') return [];
+  const sibling = el.previousElementSibling;
+  if (!sibling) return [];
+  const headStyle = getComputedStyle(el);
+  const sibStyle = getComputedStyle(sibling);
+  return checkHeroEyebrow({
+    headingTag: tag,
+    headingText: el.textContent || '',
+    headingFontSize: parseFloat(headStyle.fontSize) || 0,
+    siblingTag: sibling.tagName.toLowerCase(),
+    siblingText: sibling.textContent || '',
+    siblingTextTransform: sibStyle.textTransform || '',
+    siblingFontSize: parseFloat(sibStyle.fontSize) || 0,
+    siblingLetterSpacing: parseFloat(sibStyle.letterSpacing) || 0,
+    siblingFontWeight: sibStyle.fontWeight || '',
+    siblingColor: sibStyle.color || '',
+  });
+}
+
+// Build a map of CSS custom properties declared on :root / :host / html.
+// Used to resolve var(--X) refs that jsdom returns verbatim in
+// getComputedStyle. Tailwind v4 routes every utility class through
+// CSS vars (font-weight: var(--font-weight-bold), font-size:
+// var(--text-xs), letter-spacing: var(--tracking-widest)), so without
+// resolution every style-based check silently fails on Tailwind v4
+// builds — the values come back as literal "var(--font-weight-bold)"
+// strings and parseFloat returns NaN.
+function buildCustomPropMap(document) {
+  const map = new Map();
+  let sheets;
+  try { sheets = Array.from(document.styleSheets || []); }
+  catch { return map; }
+  for (const sheet of sheets) {
+    let rules;
+    try { rules = Array.from(sheet.cssRules || []); }
+    catch { continue; }
+    for (const rule of rules) {
+      // Style rules only (type 1). Walk @media / @supports if present.
+      if (rule.type === 4 /* MEDIA_RULE */ || rule.type === 12 /* SUPPORTS_RULE */) {
+        try { rules.push(...Array.from(rule.cssRules || [])); } catch { /* ignore */ }
+        continue;
+      }
+      if (rule.type !== 1 /* STYLE_RULE */) continue;
+      const sel = rule.selectorText || '';
+      if (!/(^|,\s*)(:root|html|:host)\b/i.test(sel)) continue;
+      const style = rule.style;
+      if (!style) continue;
+      for (let i = 0; i < style.length; i++) {
+        const prop = style[i];
+        if (!prop || !prop.startsWith('--')) continue;
+        const val = style.getPropertyValue(prop).trim();
+        if (val) map.set(prop, val);
+      }
+    }
+  }
+  return map;
+}
+
+// Resolve var(--X[, fallback]) refs in a computed-style value string.
+// Recurses up to 8 levels for chained refs (--a: var(--b)). Returns
+// the original string when no refs are present or the chain doesn't
+// resolve. Safe to call on already-resolved values.
+function resolveVarRefs(raw, customPropMap, depth = 0) {
+  if (typeof raw !== 'string' || !raw.includes('var(')) return raw;
+  if (depth > 8) return raw;
+  return raw.replace(/var\(\s*(--[a-zA-Z0-9_-]+)\s*(?:,\s*([^)]+))?\)/g, (_m, name, fallback) => {
+    const v = customPropMap.get(name);
+    if (v != null) return resolveVarRefs(v, customPropMap, depth + 1);
+    return fallback ? resolveVarRefs(fallback.trim(), customPropMap, depth + 1) : _m;
+  });
+}
+
+// OKLCH → sRGB conversion (Björn Ottosson's matrices). L in 0..1 (or %),
+// C in 0..~0.4 typical, H in degrees. Returns clamped {r,g,b,a:1} in 0..255.
+// Needed because jsdom doesn't compute oklch() values — getComputedStyle
+// returns the literal "oklch(...)" string. Without this, the entire
+// Tailwind v4 color palette (which is OKLCH-based) is invisible to the
+// detector's contrast / color checks.
+function oklchToRgb(L, C, H) {
+  const hRad = (H * Math.PI) / 180;
+  const a = C * Math.cos(hRad);
+  const b = C * Math.sin(hRad);
+  const l_ = L + 0.3963377774 * a + 0.2158037573 * b;
+  const m_ = L - 0.1055613458 * a - 0.0638541728 * b;
+  const s_ = L - 0.0894841775 * a - 1.2914855480 * b;
+  const lc = l_ * l_ * l_, mc = m_ * m_ * m_, sc = s_ * s_ * s_;
+  const rLin =  4.0767416621 * lc - 3.3077115913 * mc + 0.2309699292 * sc;
+  const gLin = -1.2684380046 * lc + 2.6097574011 * mc - 0.3413193965 * sc;
+  const bLin = -0.0041960863 * lc - 0.7034186147 * mc + 1.7076147010 * sc;
+  const enc = (x) => {
+    const c = Math.max(0, Math.min(1, x));
+    return c <= 0.0031308 ? 12.92 * c : 1.055 * Math.pow(c, 1 / 2.4) - 0.055;
+  };
+  return {
+    r: Math.round(enc(rLin) * 255),
+    g: Math.round(enc(gLin) * 255),
+    b: Math.round(enc(bLin) * 255),
+    a: 1,
+  };
+}
+
+// Extended color parser: rgb/rgba/hex/oklch. Returns null on no match.
+// Use this when the input might be any CSS color form; use plain parseRgb
+// when you only expect computed rgb() values from real browsers.
+function parseAnyColor(s) {
+  if (!s || typeof s !== 'string') return null;
+  const str = s.trim();
+  if (str === 'transparent' || str === 'currentcolor' || str === 'inherit') return null;
+  let m;
+  m = str.match(/rgba?\(\s*(\d+(?:\.\d+)?)\s*,?\s*(\d+(?:\.\d+)?)\s*,?\s*(\d+(?:\.\d+)?)(?:\s*[,/]\s*([\d.]+))?\s*\)/);
+  if (m) return { r: Math.round(+m[1]), g: Math.round(+m[2]), b: Math.round(+m[3]), a: m[4] !== undefined ? +m[4] : 1 };
+  m = str.match(/^#([0-9a-f]{3,8})$/i);
+  if (m) {
+    const h = m[1];
+    if (h.length === 3 || h.length === 4) {
+      return {
+        r: parseInt(h[0] + h[0], 16),
+        g: parseInt(h[1] + h[1], 16),
+        b: parseInt(h[2] + h[2], 16),
+        a: h.length === 4 ? parseInt(h[3] + h[3], 16) / 255 : 1,
+      };
+    }
+    if (h.length === 6 || h.length === 8) {
+      return {
+        r: parseInt(h.slice(0, 2), 16),
+        g: parseInt(h.slice(2, 4), 16),
+        b: parseInt(h.slice(4, 6), 16),
+        a: h.length === 8 ? parseInt(h.slice(6, 8), 16) / 255 : 1,
+      };
+    }
+  }
+  // OKLCH parser. Tailwind v4's CSS minifier squishes the space after
+  // `%` ("21.5%.02 50"), so the separator between L and C may be absent.
+  // Match L (with optional %), then C and H separated permissively.
+  m = str.match(/oklch\(\s*([\d.]+)(%?)\s*[\s,]*\s*([\d.]+)\s*[\s,]+\s*([-\d.]+)(?:deg)?(?:\s*\/\s*([\d.]+)(%)?)?\s*\)/i);
+  if (m) {
+    const Lnum = parseFloat(m[1]);
+    const L = m[2] === '%' ? Lnum / 100 : Lnum;
+    const rgb = oklchToRgb(L, parseFloat(m[3]), parseFloat(m[4]));
+    if (m[5] !== undefined) {
+      const alpha = parseFloat(m[5]);
+      rgb.a = m[6] === '%' ? alpha / 100 : alpha;
+    }
+    return rgb;
+  }
+  return null;
+}
+
+// Resolve var() refs in a color string (via customPropMap), then parse.
+// Returns null on any failure. Used in jsdom-mode paths where
+// getComputedStyle returns literal "var(--X)" or "oklch(...)" strings.
+function parseColorResolved(str, customPropMap) {
+  if (!str) return null;
+  const resolved = customPropMap ? resolveVarRefs(str, customPropMap) : str;
+  return parseAnyColor(resolved);
+}
+
+const REPEATED_KICKER_SKIP_SELECTOR = [
+  'nav',
+  'form',
+  'table',
+  'thead',
+  'tbody',
+  'tfoot',
+  'figure',
+  'figcaption',
+  'ol',
+  'ul',
+  'li',
+  '[role="navigation"]',
+  '[aria-label*="breadcrumb" i]',
+  '[class*="breadcrumb" i]',
+  '[aria-hidden="true"]',
+  '[data-impeccable-allow-kickers]',
+].join(',');
+
+const REPEATED_KICKER_CARD_CONTEXT_SELECTOR = [
+  'article',
+  'button',
+  'a',
+  'li',
+  '[role="listitem"]',
+  '[role="option"]',
+].join(',');
+
+function cleanInlineText(el) {
+  return [...el.childNodes]
+    .filter(n => n.nodeType === 3)
+    .map(n => n.textContent)
+    .join(' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+}
+
+function isRepeatedKickerCardContext(heading, kicker) {
+  const item = heading.closest?.(REPEATED_KICKER_CARD_CONTEXT_SELECTOR);
+  return Boolean(item && (!item.contains || item.contains(kicker)));
+}
+
+function isRepeatedKickerCandidate(opts) {
+  const {
+    headingTag,
+    headingText,
+    headingFontSize,
+    kickerTag,
+    kickerText,
+    kickerTextTransform,
+    kickerFontSize,
+    kickerLetterSpacing,
+  } = opts;
+  if (!['h2', 'h3', 'h4'].includes(headingTag)) return false;
+  if (!headingText || headingText.length < 3) return false;
+  if (/^\/[\w-]+/i.test(headingText.replace(/^"|"$/g, '').trim())) return false;
+  if (!(headingFontSize >= 20)) return false;
+  if (!kickerTag || HEADING_TAGS.has(kickerTag)) return false;
+  if (!['p', 'span', 'div', 'small'].includes(kickerTag)) return false;
+  if (!kickerText || kickerText.length < 2 || kickerText.length > 34) return false;
+  if (/^step\s*\d+/i.test(kickerText) || /^\d{1,2}$/.test(kickerText)) return false;
+
+  const isUppercased = kickerTextTransform === 'uppercase'
+    || (/[A-Z]/.test(kickerText) && !/[a-z]/.test(kickerText));
+  if (!isUppercased) return false;
+  if (!(kickerFontSize > 0 && kickerFontSize <= 14)) return false;
+  const minTrackedSpacing = Math.max(1, kickerFontSize * 0.08);
+  if (!(kickerLetterSpacing >= minTrackedSpacing)) return false;
+  return true;
+}
+
+function collectRepeatedSectionKickerCandidates(doc, getStyle, resolveLetterSpacing) {
+  const candidates = [];
+  for (const heading of doc.querySelectorAll('h2, h3, h4')) {
+    if (heading.closest?.(REPEATED_KICKER_SKIP_SELECTOR)) continue;
+    const kicker = heading.previousElementSibling;
+    if (!kicker || kicker.closest?.(REPEATED_KICKER_SKIP_SELECTOR)) continue;
+    if (isRepeatedKickerCardContext(heading, kicker)) continue;
+
+    const headingStyle = getStyle(heading);
+    const kickerStyle = getStyle(kicker);
+    const headingText = (heading.textContent || '').replace(/\s+/g, ' ').trim();
+    const kickerText = cleanInlineText(kicker) || (kicker.textContent || '').replace(/\s+/g, ' ').trim();
+    const headingFontSize = resolveLetterSpacing(headingStyle.fontSize || '', 16) || parseFloat(headingStyle.fontSize) || 0;
+    const kickerFontSize = resolveLetterSpacing(kickerStyle.fontSize || '', 16) || parseFloat(kickerStyle.fontSize) || 0;
+    const kickerLetterSpacing = resolveLetterSpacing(kickerStyle.letterSpacing || '', kickerFontSize);
+
+    if (!isRepeatedKickerCandidate({
+      headingTag: heading.tagName.toLowerCase(),
+      headingText,
+      headingFontSize,
+      kickerTag: kicker.tagName.toLowerCase(),
+      kickerText,
+      kickerTextTransform: kickerStyle.textTransform || '',
+      kickerFontSize,
+      kickerLetterSpacing,
+    })) {
+      continue;
+    }
+
+    candidates.push({
+      headingTag: heading.tagName.toLowerCase(),
+      headingText: headingText.replace(/^"|"$/g, '').slice(0, 60),
+      kickerText: kickerText.slice(0, 40),
+    });
+  }
+  return candidates;
+}
+
+function checkRepeatedSectionKickersDOM() {
+  const candidates = collectRepeatedSectionKickerCandidates(
+    document,
+    (el) => getComputedStyle(el),
+    (value, fontSize) => resolveLengthPx(value, fontSize) || 0,
+  );
+  return checkRepeatedSectionKickers({ candidates });
+}
+
+function checkElementMotionDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (SAFE_TAGS.has(tag)) return [];
+  const style = getComputedStyle(el);
+  return checkMotion({
+    tag,
+    transitionProperty: style.transitionProperty || '',
+    animationName: style.animationName || '',
+    timingFunctions: [style.animationTimingFunction, style.transitionTimingFunction].filter(Boolean).join(' '),
+    classList: el.getAttribute('class') || '',
+  });
+}
+
+function checkElementGlowDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  const style = getComputedStyle(el);
+  if (!style.boxShadow || style.boxShadow === 'none') return [];
+  // Use parent's background — glow radiates outward, so the surrounding context matters
+  // If resolveBackground returns null (gradient), try to infer from the gradient colors
+  let parentBg = el.parentElement ? resolveBackground(el.parentElement) : resolveBackground(el);
+  if (!parentBg) {
+    // Gradient background — sample its colors to determine if it's dark
+    let cur = el.parentElement;
+    while (cur && cur.nodeType === 1) {
+      const bgImage = getComputedStyle(cur).backgroundImage || '';
+      const gradColors = parseGradientColors(bgImage);
+      if (gradColors.length > 0) {
+        // Average the gradient colors
+        const avg = { r: 0, g: 0, b: 0 };
+        for (const c of gradColors) { avg.r += c.r; avg.g += c.g; avg.b += c.b; }
+        avg.r = Math.round(avg.r / gradColors.length);
+        avg.g = Math.round(avg.g / gradColors.length);
+        avg.b = Math.round(avg.b / gradColors.length);
+        parentBg = avg;
+        break;
+      }
+      cur = cur.parentElement;
+    }
+  }
+  return checkGlow({ tag, boxShadow: style.boxShadow, effectiveBg: parentBg });
+}
+
+function checkElementAIPaletteDOM(el) {
+  const style = getComputedStyle(el);
+  const findings = [];
+
+  // Check gradient backgrounds for purple/violet or cyan
+  const bgImage = style.backgroundImage || '';
+  const gradColors = parseGradientColors(bgImage);
+  for (const c of gradColors) {
+    if (hasChroma(c, 50)) {
+      const hue = getHue(c);
+      if (hue >= 260 && hue <= 310) {
+        findings.push({ id: 'ai-color-palette', snippet: 'Purple/violet gradient background' });
+        break;
+      }
+      if (hue >= 160 && hue <= 200) {
+        findings.push({ id: 'ai-color-palette', snippet: 'Cyan gradient background' });
+        break;
+      }
+    }
+  }
+
+  // Check for neon text (vivid cyan/purple color on dark background)
+  const textColor = parseRgb(style.color);
+  if (textColor && hasChroma(textColor, 80)) {
+    const hue = getHue(textColor);
+    const isAIPalette = (hue >= 160 && hue <= 200) || (hue >= 260 && hue <= 310);
+    if (isAIPalette) {
+      const parentBg = el.parentElement ? resolveBackground(el.parentElement) : null;
+      // Also check gradient parents
+      let effectiveBg = parentBg;
+      if (!effectiveBg) {
+        let cur = el.parentElement;
+        while (cur && cur.nodeType === 1) {
+          const gi = getComputedStyle(cur).backgroundImage || '';
+          const gc = parseGradientColors(gi);
+          if (gc.length > 0) {
+            const avg = { r: 0, g: 0, b: 0 };
+            for (const c of gc) { avg.r += c.r; avg.g += c.g; avg.b += c.b; }
+            avg.r = Math.round(avg.r / gc.length);
+            avg.g = Math.round(avg.g / gc.length);
+            avg.b = Math.round(avg.b / gc.length);
+            effectiveBg = avg;
+            break;
+          }
+          cur = cur.parentElement;
+        }
+      }
+      if (effectiveBg && relativeLuminance(effectiveBg) < 0.1) {
+        const label = hue >= 260 ? 'Purple/violet' : 'Cyan';
+        findings.push({ id: 'ai-color-palette', snippet: `${label} neon text on dark background` });
+      }
+    }
+  }
+
+  return findings;
+}
+
+const QUALITY_TEXT_TAGS = new Set(['p', 'li', 'td', 'th', 'dd', 'blockquote', 'figcaption']);
+
+// Resolve a CSS font-size value to pixels by walking up the parent chain.
+// Browsers resolve em/rem/% to px in getComputedStyle, but jsdom returns the
+// specified value verbatim — so for the Node path we walk parents ourselves.
+function resolveFontSizePx(el, win) {
+  const chain = []; // raw font-size strings, leaf → root
+  let cur = el;
+  while (cur && cur.nodeType === 1) {
+    const fs = (win ? win.getComputedStyle(cur) : getComputedStyle(cur)).fontSize;
+    chain.push(fs || '');
+    cur = cur.parentElement;
+  }
+  // Walk root → leaf, resolving each value relative to its parent context.
+  let px = 16; // root default
+  for (let i = chain.length - 1; i >= 0; i--) {
+    const v = chain[i];
+    if (!v || v === 'inherit') continue;
+    const num = parseFloat(v);
+    if (isNaN(num)) continue;
+    if (v.endsWith('px')) px = num;
+    else if (v.endsWith('rem')) px = num * 16;
+    else if (v.endsWith('em')) px = num * px;
+    else if (v.endsWith('%')) px = (num / 100) * px;
+    else px = num; // unitless — already resolved
+  }
+  return px;
+}
+
+// Resolve a CSS length value (line-height, letter-spacing, etc.) given a
+// known font-size context. Returns null for "normal" / unparseable values.
+function resolveLengthPx(value, fontSizePx) {
+  if (!value || value === 'normal' || value === 'auto' || value === 'inherit') return null;
+  const num = parseFloat(value);
+  if (isNaN(num)) return null;
+  if (value.endsWith('px')) return num;
+  if (value.endsWith('rem')) return num * 16;
+  if (value.endsWith('em')) return num * fontSizePx;
+  if (value.endsWith('%')) return (num / 100) * fontSizePx;
+  // Unitless line-height = multiplier, return px equivalent
+  return num * fontSizePx;
+}
+
+function cssColorIsTransparent(value) {
+  if (!value) return true;
+  const str = String(value).trim().toLowerCase();
+  if (!str || str === 'transparent' || str === 'rgba(0, 0, 0, 0)') return true;
+  const parsed = parseAnyColor(str);
+  if (parsed) return (parsed.a ?? 1) <= 0.05;
+  return /^rgba\(\s*\d+\s*,\s*\d+\s*,\s*\d+\s*,\s*0(?:\.0+)?\s*\)$/.test(str);
+}
+
+function colorsNearlyMatch(a, b) {
+  const ca = parseAnyColor(a);
+  const cb = parseAnyColor(b);
+  if (!ca || !cb) return false;
+  const alphaDelta = Math.abs((ca.a ?? 1) - (cb.a ?? 1));
+  const channelDelta = Math.max(
+    Math.abs(ca.r - cb.r),
+    Math.abs(ca.g - cb.g),
+    Math.abs(ca.b - cb.b),
+  );
+  return alphaDelta <= 0.03 && channelDelta <= 3;
+}
+
+function getComputedStyleFor(win, el) {
+  if (win && typeof win.getComputedStyle === 'function') {
+    try { return win.getComputedStyle(el); } catch {}
+  }
+  if (typeof getComputedStyle === 'function') {
+    try { return getComputedStyle(el); } catch {}
+  }
+  return null;
+}
+
+function hasVisibleBackgroundBoundary(style, el, win) {
+  const bg = style?.backgroundColor || '';
+  if (cssColorIsTransparent(bg)) return false;
+
+  let parent = el?.parentElement || null;
+  while (parent) {
+    const parentStyle = getComputedStyleFor(win, parent);
+    const parentBg = parentStyle?.backgroundColor || '';
+    if (!cssColorIsTransparent(parentBg)) {
+      return !colorsNearlyMatch(bg, parentBg);
+    }
+    parent = parent.parentElement;
+  }
+
+  return true;
+}
+
+const TEXT_EDGE_TAGS = new Set(['A', 'BUTTON', 'CODE', 'DD', 'DT', 'FIGCAPTION', 'H1', 'H2', 'H3', 'H4', 'H5', 'H6', 'LI', 'P', 'PRE', 'SPAN', 'TD', 'TH']);
+
+function hasMeaningfulDirectText(node) {
+  if (!node?.childNodes) return false;
+  for (const child of node.childNodes) {
+    if (child.nodeType === 3 && child.textContent.trim().length > 4) return true;
+  }
+  return false;
+}
+
+function textDescendantsFlushSides(el, rect) {
+  const flush = { top: false, right: false, bottom: false, left: false };
+  if (!rect || !el?.querySelectorAll) return flush;
+  const TEXT_EDGE_THRESHOLD = 4;
+  const candidates = el.querySelectorAll('a, button, code, dd, dt, figcaption, h1, h2, h3, h4, h5, h6, li, p, pre, span, td, th');
+  for (const node of candidates) {
+    if (!TEXT_EDGE_TAGS.has(node.tagName) || !hasMeaningfulDirectText(node)) continue;
+    let nodeRect = null;
+    try { nodeRect = node.getBoundingClientRect(); } catch {}
+    if (!nodeRect || nodeRect.width <= 0 || nodeRect.height <= 0) continue;
+    if (nodeRect.bottom < rect.top || nodeRect.top > rect.bottom || nodeRect.right < rect.left || nodeRect.left > rect.right) continue;
+    if (nodeRect.top - rect.top <= TEXT_EDGE_THRESHOLD) flush.top = true;
+    if (rect.right - nodeRect.right <= TEXT_EDGE_THRESHOLD) flush.right = true;
+    if (rect.bottom - nodeRect.bottom <= TEXT_EDGE_THRESHOLD) flush.bottom = true;
+    if (nodeRect.left - rect.left <= TEXT_EDGE_THRESHOLD) flush.left = true;
+  }
+  return flush;
+}
+
+// Pure quality checks. Most run on computed CSS and DOM-only inputs (work in
+// jsdom and the browser). Two checks (line-length, cramped-padding) gate on
+// element rect dimensions, which jsdom can't compute — pass `rect: null` from
+// the Node adapter to skip those.
+//
+// Both adapters resolve font-size, line-height and letter-spacing to pixels
+// before calling this so the pure function only deals with numbers.
+function checkQuality(opts) {
+  const { el, tag, style, hasDirectText, textLen, fontSize, lineHeightPx, letterSpacingPx, rect, lineMax = 80, viewportWidth = 0, win = null } = opts;
+  const findings = [];
+  // Skip browser extension injected elements
+  const elId = el.id || '';
+  if (elId.startsWith('claude-') || elId.startsWith('cic-')) return findings;
+
+  // --- Line length too long --- (browser-only: needs rect.width)
+  if (rect && hasDirectText && QUALITY_TEXT_TAGS.has(tag) && rect.width > 0 && textLen > lineMax) {
+    const charsPerLine = rect.width / (fontSize * 0.5);
+    if (charsPerLine > lineMax + 5) {
+      findings.push({ id: 'line-length', snippet: `~${Math.round(charsPerLine)} chars/line (aim for <${lineMax})` });
+    }
+  }
+
+  // --- Cramped padding --- (browser-only: needs rect to skip small badges/labels)
+  // Vertical and horizontal thresholds are independent because line-height
+  // already provides built-in vertical breathing room (the line box is taller
+  // than the cap height), but horizontal has no equivalent. Both scale with
+  // font-size — bigger text demands proportionally more padding.
+  //   vertical:   max(4px, fontSize × 0.3)
+  //   horizontal: max(8px, fontSize × 0.5)
+  const isInlineCode = tag === 'code' && !(el.closest && el.closest('pre'));
+  if (!isInlineCode && rect && hasDirectText && textLen > 20 && rect.width > 100 && rect.height > 30) {
+    const borders = {
+      top: parseFloat(style.borderTopWidth) || 0,
+      right: parseFloat(style.borderRightWidth) || 0,
+      bottom: parseFloat(style.borderBottomWidth) || 0,
+      left: parseFloat(style.borderLeftWidth) || 0,
+    };
+    const borderCount = Object.values(borders).filter(w => w > 0).length;
+    const hasBg = hasVisibleBackgroundBoundary(style, el, win);
+    if (borderCount >= 2 || hasBg) {
+      const vPads = [], hPads = [];
+      if (hasBg || borders.top > 0) vPads.push(parseFloat(style.paddingTop) || 0);
+      if (hasBg || borders.bottom > 0) vPads.push(parseFloat(style.paddingBottom) || 0);
+      if (hasBg || borders.left > 0) hPads.push(parseFloat(style.paddingLeft) || 0);
+      if (hasBg || borders.right > 0) hPads.push(parseFloat(style.paddingRight) || 0);
+
+      const vMin = vPads.length ? Math.min(...vPads) : Infinity;
+      const hMin = hPads.length ? Math.min(...hPads) : Infinity;
+      const vThresh = Math.max(4, fontSize * 0.3);
+      const hThresh = Math.max(8, fontSize * 0.5);
+
+      // Emit at most one finding per element — pick whichever axis is worse.
+      if (vMin < vThresh) {
+        findings.push({ id: 'cramped-padding', snippet: `${vMin}px vertical padding (need ≥${vThresh.toFixed(1)}px for ${fontSize}px text)` });
+      } else if (hMin < hThresh) {
+        findings.push({ id: 'cramped-padding', snippet: `${hMin}px horizontal padding (need ≥${hThresh.toFixed(1)}px for ${fontSize}px text)` });
+      }
+    }
+  }
+
+  // --- Flush against a visible boundary ---
+  // Fires when a container has a visible boundary (border, outline, OR a
+  // non-transparent background) AND near-zero padding on the bounded
+  // side(s) AND text-bearing children land flush against the boundary.
+  //
+  // Distinct from cramped-padding: that rule needs the element itself to
+  // have direct text (hasDirectText). This rule targets the OPPOSITE
+  // shape — a container with NO direct text, only children — which is
+  // exactly what cramped-padding misses (a section wrapping a label +
+  // list lands a free pass).
+  //
+  // The classic shape: agent writes `padding: 28px 0 0` shorthand on a
+  // section that also has a border, zeroing horizontal padding so the
+  // text-bearing children touch the side borders. Background and
+  // outline count too: a colored card with zero padding has the same
+  // visual failure mode.
+  {
+    const FLUSH_SKIP_TAGS = new Set(['HTML', 'BODY', 'MAIN', 'HEADER', 'FOOTER', 'NAV', 'ARTICLE', 'ASIDE', 'BUTTON', 'A', 'LABEL', 'SUMMARY', 'CODE', 'PRE', 'INPUT', 'TEXTAREA', 'SELECT', 'FORM', 'FIGURE', 'TABLE', 'TBODY', 'THEAD', 'TR', 'TD', 'TH']);
+    const upperTag = tag ? tag.toUpperCase() : '';
+    const elPosition = style.position || '';
+    if (
+      !FLUSH_SKIP_TAGS.has(upperTag) &&
+      !hasDirectText &&
+      !['fixed', 'absolute'].includes(elPosition) &&
+      el.children && el.children.length > 0
+    ) {
+      const borderW = {
+        top:    parseFloat(style.borderTopWidth)    || 0,
+        right:  parseFloat(style.borderRightWidth)  || 0,
+        bottom: parseFloat(style.borderBottomWidth) || 0,
+        left:   parseFloat(style.borderLeftWidth)   || 0,
+      };
+      const borderVisible = {
+        top:    borderW.top    > 0 && !cssColorIsTransparent(style.borderTopColor),
+        right:  borderW.right  > 0 && !cssColorIsTransparent(style.borderRightColor),
+        bottom: borderW.bottom > 0 && !cssColorIsTransparent(style.borderBottomColor),
+        left:   borderW.left   > 0 && !cssColorIsTransparent(style.borderLeftColor),
+      };
+      // Outline detection. jsdom decomposes `border` shorthand into
+      // border{Top,…}Width/Color but does NOT decompose `outline` —
+      // the longhands come back empty when the value was set via the
+      // shorthand. Fall back to parsing `style.outline` ourselves.
+      let outlineW = parseFloat(style.outlineWidth) || 0;
+      let outlineStyleVal = style.outlineStyle || '';
+      let outlineColorVal = style.outlineColor || '';
+      if (!outlineW && style.outline) {
+        const wMatch = style.outline.match(/(\d+(?:\.\d+)?)\s*px/);
+        if (wMatch) outlineW = parseFloat(wMatch[1]) || 0;
+        if (!outlineStyleVal) {
+          outlineStyleVal = /\b(solid|dashed|dotted|double|groove|ridge|inset|outset)\b/.test(style.outline) ? 'solid' : '';
+        }
+        if (!outlineColorVal) {
+          const cMatch = style.outline.match(/(rgba?\([^)]+\)|#[0-9a-fA-F]{3,8}|[a-zA-Z]+)\s*$/);
+          if (cMatch) outlineColorVal = cMatch[1];
+        }
+      }
+      const outlineVisible = outlineW > 0 && !cssColorIsTransparent(outlineColorVal) && outlineStyleVal && outlineStyleVal !== 'none';
+      const bgVisible = hasVisibleBackgroundBoundary(style, el, win);
+
+      const anyVisible = borderVisible.top || borderVisible.right || borderVisible.bottom || borderVisible.left || outlineVisible || bgVisible;
+      if (anyVisible) {
+        // Resolve padding to px (jsdom returns raw "1.5rem" etc., not the
+        // computed px value; parseFloat would strip the unit and treat
+        // 1.5rem as 1.5px, false-flagging legitimate insets).
+        const pad = {
+          top:    resolveLengthPx(style.paddingTop,    fontSize) ?? 0,
+          right:  resolveLengthPx(style.paddingRight,  fontSize) ?? 0,
+          bottom: resolveLengthPx(style.paddingBottom, fontSize) ?? 0,
+          left:   resolveLengthPx(style.paddingLeft,   fontSize) ?? 0,
+        };
+        const PAD_THRESHOLD = 2;
+        // Children-insulate-this-side: a side is insulated if ANY direct
+        // child has its own padding ≥ 4px on that side. Rationale: in
+        // typical flow, only the first/last (or leftmost/rightmost)
+        // children actually sit at the parent's edges. If even one of
+        // them has its own padding, the visual flush is broken on that
+        // side. Classic example: a column-flow card frame where the
+        // top child (header) has padding-top:12 and the bottom child
+        // (footer) has padding-bottom:8 — the parent's padding:0 doesn't
+        // matter; nothing is actually flush. The `any-child-insulates`
+        // heuristic accepts some false negatives (a card with one heavily
+        // padded middle child won't flag) for far fewer false positives.
+        const CHILD_INSULATE_THRESHOLD = 4;
+        const childrenInsulate = { top: false, right: false, bottom: false, left: false };
+        for (const child of el.children) {
+          let childStyle = getComputedStyleFor(win, child);
+          if (!childStyle) continue;
+          const childPad = {
+            top:    resolveLengthPx(childStyle.paddingTop,    fontSize) ?? 0,
+            right:  resolveLengthPx(childStyle.paddingRight,  fontSize) ?? 0,
+            bottom: resolveLengthPx(childStyle.paddingBottom, fontSize) ?? 0,
+            left:   resolveLengthPx(childStyle.paddingLeft,   fontSize) ?? 0,
+          };
+          const childMargin = {
+            top:    resolveLengthPx(childStyle.marginTop,    fontSize) ?? 0,
+            right:  resolveLengthPx(childStyle.marginRight,  fontSize) ?? 0,
+            bottom: resolveLengthPx(childStyle.marginBottom, fontSize) ?? 0,
+            left:   resolveLengthPx(childStyle.marginLeft,   fontSize) ?? 0,
+          };
+          if (rect && typeof child.getBoundingClientRect === 'function') {
+            try {
+              const childRect = child.getBoundingClientRect();
+              if (childRect && childRect.width > 0 && childRect.height > 0) {
+                if (childRect.top - rect.top >= CHILD_INSULATE_THRESHOLD) childrenInsulate.top = true;
+                if (rect.right - childRect.right >= CHILD_INSULATE_THRESHOLD) childrenInsulate.right = true;
+                if (rect.bottom - childRect.bottom >= CHILD_INSULATE_THRESHOLD) childrenInsulate.bottom = true;
+                if (childRect.left - rect.left >= CHILD_INSULATE_THRESHOLD) childrenInsulate.left = true;
+              }
+            } catch {}
+          }
+          for (const s of ['top', 'right', 'bottom', 'left']) {
+            if (childPad[s] >= CHILD_INSULATE_THRESHOLD || childMargin[s] >= CHILD_INSULATE_THRESHOLD) {
+              childrenInsulate[s] = true;
+            }
+          }
+        }
+
+        const textFlush = rect ? textDescendantsFlushSides(el, rect) : null;
+        const fullBleedBgBand = rect && viewportWidth > 0 && rect.width >= viewportWidth * 0.94 && bgVisible && !outlineVisible;
+        const flushSides = [];
+        for (const side of ['top', 'right', 'bottom', 'left']) {
+          const bgBoundsSide = bgVisible && !(fullBleedBgBand && (side === 'left' || side === 'right'));
+          const sideBounded = borderVisible[side] || outlineVisible || bgBoundsSide;
+          if (sideBounded && pad[side] <= PAD_THRESHOLD && !childrenInsulate[side] && (!textFlush || textFlush[side])) {
+            flushSides.push(side);
+          }
+        }
+
+        if (flushSides.length > 0) {
+          // Confirm at least one direct child has substantial text content
+          // (> 4 chars). Without this, the flush is harmless: e.g. an
+          // image-only card.
+          let hasTextChild = false;
+          for (const child of el.children) {
+            const childText = (child.textContent || '').trim();
+            if (childText.length > 4) { hasTextChild = true; break; }
+          }
+          if (hasTextChild) {
+            const cls = (typeof el.className === 'string' && el.className.trim())
+              ? el.className.trim().split(/\s+/)[0]
+              : '';
+            const boundaryParts = [];
+            const borderSidesVisible = ['top', 'right', 'bottom', 'left'].filter(s => borderVisible[s]);
+            if (borderSidesVisible.length === 4) boundaryParts.push('border');
+            else if (borderSidesVisible.length > 0) boundaryParts.push(`border-${borderSidesVisible.join('/')}`);
+            if (outlineVisible) boundaryParts.push('outline');
+            if (bgVisible) boundaryParts.push('bg');
+            const sidesLabel = flushSides.length === 4 ? 'all sides' : flushSides.join('/');
+            const ident = cls
+              ? `<${tag.toLowerCase()}> "${cls}"`
+              : `<${tag.toLowerCase()}>`;
+            findings.push({
+              id: 'cramped-padding',
+              snippet: `${ident}: children flush against ${boundaryParts.join('+')} on ${sidesLabel} (no inset)`,
+            });
+          }
+        }
+      }
+    }
+  }
+
+  // --- Body text touching viewport edge --- (browser-only: needs rect)
+  // Catches the failure mode where the agent ships body paragraphs
+  // with NO container providing horizontal padding — text bleeds
+  // directly to the viewport edge. Different from cramped-padding,
+  // which requires a colored/bordered container. Here the failure
+  // is the absence of the container entirely.
+  //
+  // Gate aggressively to avoid false positives:
+  //   - <p> or <li> only (body content; not headings, not nav, not
+  //     wrappers)
+  //   - text > 40 chars (paragraph-like, not a label)
+  //   - rect.width > 50% of viewport (real body, not a pull-quote)
+  //   - rect.left < 16 OR rect.right > viewport - 16 (actually
+  //     touching the edge)
+  //   - not inside <nav> or <header> (those legitimately bleed)
+  //   - element itself has no background-color (intentional full-bleed
+  //     sections set a bg-color and provide their own internal padding)
+  if (rect && hasDirectText && textLen > 40 && ['P', 'LI'].includes(tag.toUpperCase()) && viewportWidth > 0) {
+    const inNavHeader = el.closest && (el.closest('nav') || el.closest('header'));
+    const hasOwnBg = style.backgroundColor && style.backgroundColor !== 'rgba(0, 0, 0, 0)' && style.backgroundColor !== 'transparent';
+    const isPositioned = ['fixed', 'absolute'].includes(style.position || '');
+    const widthRatio = rect.width / viewportWidth;
+    const leftClose = rect.left < 16;
+    const rightClose = rect.right > viewportWidth - 16;
+    if (!inNavHeader && !hasOwnBg && !isPositioned && widthRatio > 0.5 && (leftClose || rightClose)) {
+      const which = leftClose && rightClose
+        ? `left ${Math.round(rect.left)}px / right ${Math.round(viewportWidth - rect.right)}px`
+        : leftClose
+          ? `left ${Math.round(rect.left)}px`
+          : `right ${Math.round(viewportWidth - rect.right)}px`;
+      findings.push({ id: 'body-text-viewport-edge', snippet: `<${tag.toLowerCase()}> with ${textLen}-char body bleeds to viewport edge (${which})` });
+    }
+  }
+
+  // --- Tight line height ---
+  if (hasDirectText && textLen > 50 && !['h1','h2','h3','h4','h5','h6'].includes(tag)) {
+    if (lineHeightPx != null && fontSize > 0) {
+      const ratio = lineHeightPx / fontSize;
+      if (ratio > 0 && ratio < 1.3) {
+        findings.push({ id: 'tight-leading', snippet: `line-height ${ratio.toFixed(2)}x (need >=1.3)` });
+      }
+    }
+  }
+
+  // --- Justified text (without hyphens) ---
+  if (hasDirectText && style.textAlign === 'justify') {
+    const hyphens = style.hyphens || style.webkitHyphens || '';
+    if (hyphens !== 'auto') {
+      findings.push({ id: 'justified-text', snippet: 'text-align: justify without hyphens: auto' });
+    }
+  }
+
+  // --- Tiny body text ---
+  // Only flag actual body content, not UI labels (buttons, tabs, badges, captions, footer text, etc.)
+  if (hasDirectText && textLen > 20 && fontSize < 12) {
+    const skipTags = ['sub', 'sup', 'code', 'kbd', 'samp', 'var', 'caption', 'figcaption'];
+    const inUIContext = el.closest && el.closest('button, a, label, summary, pre, [role="button"], [role="link"], [role="tab"], [role="menuitem"], [role="option"], nav, footer, [aria-hidden="true"], [class*="badge" i], [class*="caption" i], [class*="chip" i], [class*="code" i], [class*="console" i], [class*="diff" i], [class*="label" i], [class*="meta" i], [class*="mock" i], [class*="pill" i], [class*="preview" i], [class*="tag" i], [class*="terminal" i], [class*="writes" i]');
+    const isUppercase = style.textTransform === 'uppercase';
+    if (!skipTags.includes(tag) && !inUIContext && !isUppercase) {
+      findings.push({ id: 'tiny-text', snippet: `${fontSize}px body text` });
+    }
+  }
+
+  // --- All-caps body text ---
+  if (hasDirectText && textLen > 30 && style.textTransform === 'uppercase') {
+    if (!['h1','h2','h3','h4','h5','h6'].includes(tag)) {
+      findings.push({ id: 'all-caps-body', snippet: `text-transform: uppercase on ${textLen} chars of body text` });
+    }
+  }
+
+  // --- Wide letter spacing on body text ---
+  if (hasDirectText && textLen > 20 && style.textTransform !== 'uppercase') {
+    if (letterSpacingPx != null && letterSpacingPx > 0 && fontSize > 0) {
+      const trackingEm = letterSpacingPx / fontSize;
+      if (trackingEm > 0.05) {
+        findings.push({ id: 'wide-tracking', snippet: `letter-spacing: ${trackingEm.toFixed(2)}em on body text` });
+      }
+    }
+  }
+
+  // --- Crushed letter spacing (mirror of wide-tracking) ---
+  // Tracking pulled tighter than ~-0.05em crushes characters into each other.
+  // Optical tightening that display type legitimately wants (around -0.02em)
+  // stays well above this floor.
+  if (hasDirectText && textLen > 20 && fontSize > 0) {
+    if (letterSpacingPx != null && letterSpacingPx < 0) {
+      const trackingEm = letterSpacingPx / fontSize;
+      if (trackingEm <= -0.05) {
+        const excerpt = (el.textContent || '').trim().replace(/\s+/g, ' ').slice(0, 40);
+        findings.push({ id: 'extreme-negative-tracking', snippet: `letter-spacing: ${trackingEm.toFixed(2)}em — "${excerpt}"` });
+      }
+    }
+  }
+
+  return findings;
+}
+
+function checkElementQualityDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  const style = getComputedStyle(el);
+  const hasDirectText = [...el.childNodes].some(n => n.nodeType === 3 && n.textContent.trim().length > 10);
+  const textLen = el.textContent?.trim().length || 0;
+  // Browser getComputedStyle resolves everything to px — direct parseFloat
+  // works.
+  const fontSize = parseFloat(style.fontSize) || 16;
+  const lineHeightPx = resolveLengthPx(style.lineHeight, fontSize);
+  const letterSpacingPx = resolveLengthPx(style.letterSpacing, fontSize);
+  const rect = el.getBoundingClientRect();
+  const lineMax = (typeof window !== 'undefined' && window.__IMPECCABLE_CONFIG__?.lineLengthMax) || 80;
+  const viewportWidth = (typeof window !== 'undefined' ? window.innerWidth : 0) || 0;
+  return checkQuality({ el, tag, style, hasDirectText, textLen, fontSize, lineHeightPx, letterSpacingPx, rect, lineMax, viewportWidth, win: typeof window !== 'undefined' ? window : null });
+}
+
+// Pure page-level skipped-heading walk. Takes a Document so it works in both
+// the browser and jsdom.
+function checkPageQualityFromDoc(doc) {
+  const findings = [];
+  const headings = doc.querySelectorAll('h1, h2, h3, h4, h5, h6');
+  let prevLevel = 0;
+  let prevText = '';
+  for (const h of headings) {
+    const level = parseInt(h.tagName[1]);
+    const text = (h.textContent || '').trim().replace(/\s+/g, ' ').slice(0, 60);
+    if (prevLevel > 0 && level > prevLevel + 1) {
+      findings.push({
+        id: 'skipped-heading',
+        snippet: `<h${prevLevel}> "${prevText}" followed by <h${level}> "${text}" (missing h${prevLevel + 1})`,
+      });
+    }
+    prevLevel = level;
+    prevText = text;
+  }
+  return findings;
+}
+
+// Browser adapter (returns the legacy { type, detail } shape used by the overlay loop)
+function checkPageQualityDOM() {
+  return checkPageQualityFromDoc(document).map(f => ({ type: f.id, detail: f.snippet }));
+}
+
+// Node adapters — take pre-extracted jsdom computed style
+
+// jsdom doesn't lay out OR resolve em/rem/% to px — so we pre-resolve every
+// CSS length the rule needs ourselves (walking the parent chain for
+// font-size inheritance), and pass `rect: null` to skip the two rules that
+// genuinely need element rects (line-length, cramped-padding).
+function checkElementQuality(el, style, tag, window) {
+  const hasDirectText = [...el.childNodes].some(n => n.nodeType === 3 && n.textContent.trim().length > 10);
+  const textLen = el.textContent?.trim().length || 0;
+  const fontSize = resolveFontSizePx(el, window);
+  const lineHeightPx = resolveLengthPx(style.lineHeight, fontSize);
+  const letterSpacingPx = resolveLengthPx(style.letterSpacing, fontSize);
+  return checkQuality({ el, tag, style, hasDirectText, textLen, fontSize, lineHeightPx, letterSpacingPx, rect: null, win: window });
+}
+
+function checkElementBorders(tag, style, overrides, resolvedRadius) {
+  const sides = ['Top', 'Right', 'Bottom', 'Left'];
+  const widths = {}, colors = {};
+  for (const s of sides) {
+    widths[s] = parseFloat(style[`border${s}Width`]) || 0;
+    colors[s] = style[`border${s}Color`] || '';
+    // jsdom silently drops any border shorthand containing var(), leaving
+    // both width and color empty on the computed style. When the detectHtml
+    // pre-pass pulled a resolved value off the rule, use it to fill in the
+    // missing side so the side-tab check can run. Real browsers resolve
+    // var() natively, so this fallback is a no-op in the browser path.
+    if (widths[s] === 0 && overrides && overrides[s]) {
+      widths[s] = overrides[s].width;
+      colors[s] = overrides[s].color;
+    } else if (colors[s] && colors[s].startsWith('var(') && overrides && overrides[s]) {
+      // Longhand case: jsdom kept the width but left the color as the
+      // literal `var(...)` string. Substitute the resolved color.
+      colors[s] = overrides[s].color;
+    }
+  }
+  // resolvedRadius lets the caller pre-resolve the radius via
+  // resolveBorderRadiusPx so the value survives jsdom 29.1.0's broken
+  // shorthand serialization. Falls back to the computed value for tests
+  // and browser callers that don't pre-resolve.
+  const radius = resolvedRadius != null
+    ? resolvedRadius
+    : (parseFloat(style.borderRadius) || 0);
+  return checkBorders(tag, widths, colors, radius);
+}
+
+function checkElementColors(el, style, tag, window, customPropMap, hasAnchorInheritRule) {
+  const directText = [...el.childNodes].filter(n => n.nodeType === 3).map(n => n.textContent).join('');
+  const hasDirectText = directText.trim().length > 0;
+
+  const effectiveBg = resolveBackground(el, window, customPropMap);
+  // jsdom returns literal "var(--X)" / "oklch(...)" for color, so plain
+  // parseRgb misses Tailwind-tokenized text colors. Resolve through the
+  // customPropMap first; fall back to parseRgb for vanilla rgb() pages.
+  let textColor = customPropMap ? parseColorResolved(style.color, customPropMap) : null;
+  if (!textColor) textColor = parseRgb(style.color);
+
+  // Anchor-inherit FP workaround: jsdom's UA stylesheet has `:link { color:
+  // blue }` at high specificity. The page's `a { color: inherit }` rule
+  // (Tailwind v4 preflight) loses to jsdom even though it WINS in real
+  // browsers (Chrome's UA wraps :link in :where() — zero specificity).
+  // When the page declares the inherit rule AND we see jsdom's default
+  // link blue on an anchor, walk to the nearest non-anchor ancestor and
+  // use its color instead.
+  if (
+    hasAnchorInheritRule &&
+    textColor &&
+    textColor.r === 0 && textColor.g === 0 && textColor.b === 238 &&
+    (tag === 'a' || el.closest?.('a'))
+  ) {
+    let cur = el.parentElement;
+    while (cur && cur.tagName !== 'HTML') {
+      if (cur.tagName !== 'A') {
+        const ps = window.getComputedStyle(cur);
+        const inh = (customPropMap ? parseColorResolved(ps.color, customPropMap) : null) || parseRgb(ps.color);
+        if (inh && !(inh.r === 0 && inh.g === 0 && inh.b === 238)) {
+          textColor = inh;
+          break;
+        }
+      }
+      cur = cur.parentElement;
+    }
+  }
+
+  return checkColors({
+    tag,
+    textColor,
+    bgColor: readOwnBackgroundColor(el, style),
+    effectiveBg,
+    effectiveBgStops: effectiveBg ? null : resolveGradientStops(el, window),
+    fontSize: parseFloat(style.fontSize) || 16,
+    fontWeight: parseInt(style.fontWeight) || 400,
+    hasDirectText,
+    isEmojiOnly: isEmojiOnlyText(directText),
+    bgClip: style.webkitBackgroundClip || style.backgroundClip || '',
+    bgImage: style.backgroundImage || '',
+    classList: el.getAttribute?.('class') || el.className || '',
+  });
+}
+
+function checkElementIconTile(el, tag, window) {
+  if (!HEADING_TAGS.has(tag)) return [];
+  const sibling = el.previousElementSibling;
+  if (!sibling) return [];
+
+  const sibStyle = window.getComputedStyle(sibling);
+  // jsdom doesn't lay out — read explicit pixel dimensions from CSS instead.
+  const sibWidth = parseFloat(sibStyle.width) || 0;
+  const sibHeight = parseFloat(sibStyle.height) || 0;
+
+  const iconChild = sibling.querySelector('svg, i[data-lucide], i[class*="fa-"], i[class*="icon"]');
+  let iconWidth = 0;
+  if (iconChild) {
+    const iconStyle = window.getComputedStyle(iconChild);
+    iconWidth = parseFloat(iconStyle.width) || parseFloat(iconChild.getAttribute('width')) || 0;
+  }
+  // Or: tile contains an emoji/symbol character directly as its only content
+  const sibDirectText = [...sibling.childNodes].filter(n => n.nodeType === 3).map(n => n.textContent).join('');
+  const hasInlineEmojiIcon = sibling.children.length === 0 && isEmojiOnlyText(sibDirectText);
+
+  return checkIconTile({
+    headingTag: tag,
+    headingText: el.textContent || '',
+    headingTop: 0, // jsdom: no layout, skip vertical-stacking gate
+    siblingTag: sibling.tagName.toLowerCase(),
+    siblingWidth: sibWidth,
+    siblingHeight: sibHeight,
+    siblingBottom: 0,
+    siblingBgColor: parseRgb(sibStyle.backgroundColor),
+    siblingBgImage: sibStyle.backgroundImage || '',
+    siblingBorderWidth: parseFloat(sibStyle.borderTopWidth) || 0,
+    siblingBorderRadius: resolveBorderRadiusPx(sibling, sibStyle, sibWidth, window),
+    hasIconChild: !!iconChild || hasInlineEmojiIcon,
+    iconChildWidth: iconWidth,
+  });
+}
+
+function checkElementItalicSerif(el, style, tag) {
+  if (tag !== 'h1' && tag !== 'h2') return [];
+  return checkItalicSerif({
+    tag,
+    fontStyle: style.fontStyle || '',
+    fontFamily: style.fontFamily || '',
+    fontSize: parseFloat(style.fontSize) || 0,
+    headingText: el.textContent || '',
+  });
+}
+
+function checkElementHeroEyebrow(el, style, tag, window, customPropMap) {
+  if (tag !== 'h1') return [];
+  const sibling = el.previousElementSibling;
+  if (!sibling) return [];
+  const sibStyle = window.getComputedStyle(sibling);
+  // Resolve Tailwind v4 CSS-variable wrappers (font-weight:var(--font-weight-bold)
+  // etc.) before parsing. jsdom returns these verbatim from getComputedStyle;
+  // without resolution every style-based gate fails silently on Tailwind v4 builds.
+  const fontSizeRaw = customPropMap ? resolveVarRefs(sibStyle.fontSize, customPropMap) : sibStyle.fontSize;
+  const fontWeightRaw = customPropMap ? resolveVarRefs(sibStyle.fontWeight, customPropMap) : sibStyle.fontWeight;
+  const letterSpacingRaw = customPropMap ? resolveVarRefs(sibStyle.letterSpacing, customPropMap) : sibStyle.letterSpacing;
+  const colorRaw = customPropMap ? resolveVarRefs(sibStyle.color, customPropMap) : sibStyle.color;
+  const headingFontSizeRaw = customPropMap ? resolveVarRefs(style.fontSize, customPropMap) : style.fontSize;
+  const siblingFontSize = parseFloat(fontSizeRaw) || 0;
+  // resolveLengthPx returns null for 'normal' / 'auto'; coerce to 0 so the
+  // gate falls through cleanly. jsdom returns letter-spacing verbatim
+  // (e.g. '0.15em'), unlike real browsers, so this conversion is required.
+  return checkHeroEyebrow({
+    headingTag: tag,
+    headingText: el.textContent || '',
+    headingFontSize: parseFloat(headingFontSizeRaw) || 0,
+    siblingTag: sibling.tagName.toLowerCase(),
+    siblingText: sibling.textContent || '',
+    siblingTextTransform: sibStyle.textTransform || '',
+    siblingFontSize,
+    siblingLetterSpacing: resolveLengthPx(letterSpacingRaw, siblingFontSize) || 0,
+    siblingFontWeight: fontWeightRaw || '',
+    siblingColor: colorRaw || '',
+  });
+}
+
+function checkRepeatedSectionKickersFromDoc(doc, win) {
+  const candidates = collectRepeatedSectionKickerCandidates(
+    doc,
+    (el) => win.getComputedStyle(el),
+    (value, fontSize) => resolveLengthPx(value, fontSize) || 0,
+  );
+  return checkRepeatedSectionKickers({ candidates });
+}
+
+function checkElementMotion(tag, style) {
+  return checkMotion({
+    tag,
+    transitionProperty: style.transitionProperty || '',
+    animationName: style.animationName || '',
+    timingFunctions: [style.animationTimingFunction, style.transitionTimingFunction].filter(Boolean).join(' '),
+    classList: '',
+  });
+}
+
+function checkElementGlow(tag, style, effectiveBg) {
+  if (!style.boxShadow || style.boxShadow === 'none') return [];
+  return checkGlow({ tag, boxShadow: style.boxShadow, effectiveBg });
+}
+
+// ─── Section 6: Page-Level Checks ───────────────────────────────────────────
+
+// Browser page-level checks — use document/getComputedStyle globals
+
+function checkTypography() {
+  const findings = [];
+
+  // Walk actual text-bearing elements and tally font usage by *computed style*.
+  // This is much more accurate than scanning CSS rules — it ignores rules that
+  // exist in the stylesheet but apply to nothing (e.g. demo classes showing
+  // anti-patterns), and counts what the user actually sees.
+  const fontUsage = new Map(); // primary font name → count of elements
+  let totalTextElements = 0;
+  for (const el of document.querySelectorAll('p, h1, h2, h3, h4, h5, h6, li, td, th, dd, blockquote, figcaption, a, button, label, span')) {
+    // Skip impeccable's own elements
+    if (el.closest && el.closest('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
+    // Only count elements that actually have visible direct text
+    const hasText = [...el.childNodes].some(n => n.nodeType === 3 && n.textContent.trim().length > 0);
+    if (!hasText) continue;
+    const style = getComputedStyle(el);
+    const ff = style.fontFamily;
+    if (!ff) continue;
+    const stack = ff.split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase());
+    const primary = stack.find(f => f && !GENERIC_FONTS.has(f));
+    if (!primary) continue;
+    fontUsage.set(primary, (fontUsage.get(primary) || 0) + 1);
+    totalTextElements++;
+  }
+
+  if (totalTextElements >= 20) {
+    // A font is "primary" if it's used by at least 15% of text elements
+    const PRIMARY_THRESHOLD = 0.15;
+    for (const [font, count] of fontUsage) {
+      const share = count / totalTextElements;
+      if (share < PRIMARY_THRESHOLD) continue;
+      if (!OVERUSED_FONTS.has(font)) continue;
+      if (isBrandFontOnOwnDomain(font)) continue;
+      findings.push({ type: 'overused-font', detail: `Primary font: ${font} (${Math.round(share * 100)}% of text)` });
+    }
+
+    // Single-font check: only one distinct primary font across all text
+    if (fontUsage.size === 1) {
+      const only = [...fontUsage.keys()][0];
+      findings.push({ type: 'single-font', detail: `only font used is ${only}` });
+    }
+  }
+
+  const sizes = new Set();
+  for (const el of document.querySelectorAll('h1,h2,h3,h4,h5,h6,p,span,a,li,td,th,label,button,div')) {
+    const fs = parseFloat(getComputedStyle(el).fontSize);
+    if (fs > 0 && fs < 200) sizes.add(Math.round(fs * 10) / 10);
+  }
+  if (sizes.size >= 3) {
+    const sorted = [...sizes].sort((a, b) => a - b);
+    const ratio = sorted[sorted.length - 1] / sorted[0];
+    if (ratio < 2.0) {
+      findings.push({ type: 'flat-type-hierarchy', detail: `Sizes: ${sorted.map(s => s + 'px').join(', ')} (ratio ${ratio.toFixed(1)}:1)` });
+    }
+  }
+
+  return findings;
+}
+
+function isCardLikeDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (SAFE_TAGS.has(tag) || ['input','select','textarea','img','video','canvas','picture'].includes(tag)) return false;
+  const style = getComputedStyle(el);
+  const cls = el.getAttribute('class') || '';
+  const hasShadow = (style.boxShadow && style.boxShadow !== 'none') || /\bshadow(?:-sm|-md|-lg|-xl|-2xl)?\b/.test(cls);
+  const hasBorder = /\bborder\b/.test(cls);
+  const hasRadius = parseFloat(style.borderRadius) > 0 || /\brounded(?:-sm|-md|-lg|-xl|-2xl|-full)?\b/.test(cls);
+  const hasBg = (style.backgroundColor && style.backgroundColor !== 'rgba(0, 0, 0, 0)') || /\bbg-(?:white|gray-\d+|slate-\d+)\b/.test(cls);
+  return isCardLikeFromProps(hasShadow, hasBorder, hasRadius, hasBg);
+}
+
+function checkLayout() {
+  const findings = [];
+  const flaggedEls = new Set();
+
+  for (const el of document.querySelectorAll('*')) {
+    if (!isCardLikeDOM(el) || flaggedEls.has(el)) continue;
+    const cls = el.getAttribute('class') || '';
+    const style = getComputedStyle(el);
+    if (style.position === 'absolute' || style.position === 'fixed') continue;
+    if (/\b(?:dropdown|popover|tooltip|menu|modal|dialog)\b/i.test(cls)) continue;
+    if ((el.textContent?.trim().length || 0) < 10) continue;
+    const rect = el.getBoundingClientRect();
+    if (rect.width < 50 || rect.height < 30) continue;
+
+    let parent = el.parentElement;
+    while (parent) {
+      if (isCardLikeDOM(parent)) { flaggedEls.add(el); break; }
+      parent = parent.parentElement;
+    }
+  }
+
+  for (const el of flaggedEls) {
+    let isAncestor = false;
+    for (const other of flaggedEls) {
+      if (other !== el && el.contains(other)) { isAncestor = true; break; }
+    }
+    if (!isAncestor) findings.push({ type: 'nested-cards', detail: 'Card inside card', el });
+  }
+
+  return findings;
+}
+
+// Node page-level checks — take document/window as parameters
+
+function checkPageTypography(doc, win) {
+  const findings = [];
+
+  const fonts = new Set();
+  const overusedFound = new Set();
+
+  for (const sheet of doc.styleSheets) {
+    let rules;
+    try { rules = sheet.cssRules || sheet.rules; } catch { continue; }
+    if (!rules) continue;
+    for (const rule of rules) {
+      if (rule.type !== 1) continue;
+      const ff = rule.style?.fontFamily;
+      if (!ff) continue;
+      const stack = ff.split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase());
+      const primary = stack.find(f => f && !GENERIC_FONTS.has(f));
+      if (primary) {
+        fonts.add(primary);
+        if (OVERUSED_FONTS.has(primary)) overusedFound.add(primary);
+      }
+    }
+  }
+
+  // Check Google Fonts links in HTML
+  const html = doc.documentElement?.outerHTML || '';
+  const gfRe = /fonts\.googleapis\.com\/css2?\?family=([^&"'\s]+)/gi;
+  let m;
+  while ((m = gfRe.exec(html)) !== null) {
+    const families = m[1].split('|').map(f => f.split(':')[0].replace(/\+/g, ' ').toLowerCase());
+    for (const f of families) {
+      fonts.add(f);
+      if (OVERUSED_FONTS.has(f)) overusedFound.add(f);
+    }
+  }
+
+  // Also parse raw HTML/style content for font-family (jsdom may not expose all via CSSOM)
+  const ffRe = /font-family\s*:\s*([^;}]+)/gi;
+  let fm;
+  while ((fm = ffRe.exec(html)) !== null) {
+    for (const f of fm[1].split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase())) {
+      if (f && !GENERIC_FONTS.has(f)) {
+        fonts.add(f);
+        if (OVERUSED_FONTS.has(f)) overusedFound.add(f);
+      }
+    }
+  }
+
+  for (const font of overusedFound) {
+    findings.push({ id: 'overused-font', snippet: `Primary font: ${font}` });
+  }
+
+  // Single font
+  if (fonts.size === 1) {
+    const els = doc.querySelectorAll('*');
+    if (els.length >= 20) {
+      findings.push({ id: 'single-font', snippet: `only font used is ${[...fonts][0]}` });
+    }
+  }
+
+  // Flat type hierarchy
+  const sizes = new Set();
+  const textEls = doc.querySelectorAll('h1, h2, h3, h4, h5, h6, p, span, a, li, td, th, label, button, div');
+  for (const el of textEls) {
+    const fontSize = parseFloat(win.getComputedStyle(el).fontSize);
+    // Filter out sub-8px values (jsdom doesn't resolve relative units properly)
+    if (fontSize >= 8 && fontSize < 200) sizes.add(Math.round(fontSize * 10) / 10);
+  }
+  if (sizes.size >= 3) {
+    const sorted = [...sizes].sort((a, b) => a - b);
+    const ratio = sorted[sorted.length - 1] / sorted[0];
+    if (ratio < 2.0) {
+      findings.push({ id: 'flat-type-hierarchy', snippet: `Sizes: ${sorted.map(s => s + 'px').join(', ')} (ratio ${ratio.toFixed(1)}:1)` });
+    }
+  }
+
+  return findings;
+}
+
+function isCardLike(el, win) {
+  const tag = el.tagName.toLowerCase();
+  if (SAFE_TAGS.has(tag) || ['input', 'select', 'textarea', 'img', 'video', 'canvas', 'picture'].includes(tag)) return false;
+
+  const style = win.getComputedStyle(el);
+  const rawStyle = el.getAttribute?.('style') || '';
+  const cls = el.getAttribute?.('class') || '';
+
+  const hasShadow = (style.boxShadow && style.boxShadow !== 'none') ||
+    /\bshadow(?:-sm|-md|-lg|-xl|-2xl)?\b/.test(cls) || /box-shadow/i.test(rawStyle);
+  const hasBorder = /\bborder\b/.test(cls);
+  const widthPx = parseFloat(style.width) || 0;
+  const hasRadius = resolveBorderRadiusPx(el, style, widthPx, win) > 0 ||
+    /\brounded(?:-sm|-md|-lg|-xl|-2xl|-full)?\b/.test(cls) || /border-radius/i.test(rawStyle);
+  const hasBg = /\bbg-(?:white|gray-\d+|slate-\d+)\b/.test(cls) ||
+    /background(?:-color)?\s*:\s*(?!transparent)/i.test(rawStyle);
+
+  return isCardLikeFromProps(hasShadow, hasBorder, hasRadius, hasBg);
+}
+
+function checkPageLayout(doc, win) {
+  const findings = [];
+
+  // Nested cards
+  const allEls = doc.querySelectorAll('*');
+  const flaggedEls = new Set();
+  for (const el of allEls) {
+    if (!isCardLike(el, win)) continue;
+    if (flaggedEls.has(el)) continue;
+
+    const tag = el.tagName.toLowerCase();
+    const cls = el.getAttribute?.('class') || '';
+    const rawStyle = el.getAttribute?.('style') || '';
+
+    if (['pre', 'code'].includes(tag)) continue;
+    if (/\b(?:absolute|fixed)\b/.test(cls) || /position\s*:\s*(?:absolute|fixed)/i.test(rawStyle)) continue;
+    if ((el.textContent?.trim().length || 0) < 10) continue;
+    if (/\b(?:dropdown|popover|tooltip|menu|modal|dialog)\b/i.test(cls)) continue;
+
+    // Walk up to find card-like ancestor
+    let parent = el.parentElement;
+    while (parent) {
+      if (isCardLike(parent, win)) {
+        flaggedEls.add(el);
+        break;
+      }
+      parent = parent.parentElement;
+    }
+  }
+
+  // Only report innermost nested cards
+  for (const el of flaggedEls) {
+    let isAncestorOfFlagged = false;
+    for (const other of flaggedEls) {
+      if (other !== el && el.contains(other)) {
+        isAncestorOfFlagged = true;
+        break;
+      }
+    }
+    if (!isAncestorOfFlagged) {
+      findings.push({ id: 'nested-cards', snippet: `Card inside card (${el.tagName.toLowerCase()})` });
+    }
+  }
+
+  return findings;
+}
+
+// ─── Cream / beige palette (the default "tasteful" AI surface) ────────────────
+// A warm, lightly-tinted off-white page background — light, with R≥G≥B and a
+// small warm tint (not white, not a strong color). The current reflex surface.
+function isCreamColor(rgb) {
+  if (!rgb) return false;
+  const { r, g, b } = rgb;
+  if (Math.min(r, g, b) < 209) return false;   // must be light
+  if (!(r >= g && g >= b)) return false;        // warm ordering
+  const warmth = r - b;
+  return warmth >= 6 && warmth <= 48;           // tinted, not white, not strong
+}
+
+// Tailwind background utilities that render as a warm off-white surface. The
+// static engine doesn't fetch Tailwind's CSS, so a `bg-amber-50` on <body>
+// resolves to nothing in computed style — catch it from the class list
+// instead. Candidate tokens map to their actual Tailwind hex and are still
+// filtered through isCreamColor, so neutral grays (stone) and over-saturated
+// shades drop out on their own.
+const TAILWIND_BG_HEX = {
+  'bg-amber-50': '#fffbeb', 'bg-amber-100': '#fef3c7',
+  'bg-orange-50': '#fff7ed', 'bg-orange-100': '#ffedd5',
+  'bg-yellow-50': '#fefce8',
+  'bg-stone-50': '#fafaf9', 'bg-stone-100': '#f5f5f4', 'bg-stone-200': '#e7e5e4',
+};
+
+function creamFromClassList(cls) {
+  if (!cls) return null;
+  // Arbitrary value: bg-[#f5f0e6] / bg-[rgb(245_240_230)] (underscores = spaces).
+  const arb = cls.match(/\bbg-\[([^\]]+)\]/);
+  if (arb && isCreamColor(parseAnyColor(arb[1].replace(/_/g, ' ')))) return `bg-[${arb[1]}]`;
+  // Named warm-light utilities.
+  for (const [tok, hex] of Object.entries(TAILWIND_BG_HEX)) {
+    if (new RegExp(`(^|\\s)${tok}($|\\s)`).test(cls) && isCreamColor(parseAnyColor(hex))) return tok;
+  }
+  return null;
+}
+
+function checkCreamPalette(doc, win) {
+  const findings = [];
+  const body = doc.body || (doc.querySelector ? doc.querySelector('body') : null);
+  if (!body) return findings;
+  const html = doc.documentElement;
+  const getCS = (el) => (win ? win.getComputedStyle(el) : getComputedStyle(el));
+
+  // 1. Computed background — covers inline / <style> / linked CSS, and Tailwind
+  //    once it's actually rendered (browser path).
+  let bg = readOwnBackgroundColor(body, getCS(body));
+  if (!bg || bg.a === 0) {
+    if (html) bg = readOwnBackgroundColor(html, getCS(html));
+  }
+  if (isCreamColor(bg)) {
+    findings.push({ id: 'cream-palette', snippet: `cream/beige page background rgb(${bg.r}, ${bg.g}, ${bg.b})` });
+    return findings;
+  }
+
+  // 2. Tailwind class fallback — for the static path, where utility classes
+  //    never resolve to computed CSS.
+  for (const el of [body, html]) {
+    const tok = creamFromClassList(el && el.getAttribute ? el.getAttribute('class') : '');
+    if (tok) {
+      findings.push({ id: 'cream-palette', snippet: `cream/beige page background (Tailwind ${tok})` });
+      break;
+    }
+  }
+  return findings;
+}
+
+// ─── Oversized hero headline ────────────────────────────────────────────────
+// Fires when a *long* headline is set at display size and actually dominates
+// the viewport. A punchy one- or two-word headline at the same size is a
+// legitimate stylistic choice, and a large-but-contained two-line hero should
+// pass too — length and viewport share together are the tell.
+const OVERSIZED_H1_FONT_PX = 72;
+const OVERSIZED_H1_MIN_CHARS = 40;
+const OVERSIZED_H1_MIN_VIEWPORT_HEIGHT_RATIO = 0.28;
+const OVERSIZED_H1_MIN_VIEWPORT_AREA_RATIO = 0.25;
+function checkOversizedH1({ tag, fontSize, headingText, rect = null, viewportWidth = 0, viewportHeight = 0 }) {
+  if (tag !== 'h1') return [];
+  const textLen = headingText.length;
+  if (fontSize >= OVERSIZED_H1_FONT_PX && textLen >= OVERSIZED_H1_MIN_CHARS) {
+    let viewportDetail = '';
+    if (rect && viewportWidth > 0 && viewportHeight > 0) {
+      const heightRatio = rect.height / viewportHeight;
+      const areaRatio = (rect.width * rect.height) / (viewportWidth * viewportHeight);
+      const dominatesViewport = heightRatio >= OVERSIZED_H1_MIN_VIEWPORT_HEIGHT_RATIO
+        || areaRatio >= OVERSIZED_H1_MIN_VIEWPORT_AREA_RATIO;
+      if (!dominatesViewport) return [];
+      viewportDetail = `, ${Math.round(heightRatio * 100)}vh`;
+    }
+    return [{ id: 'oversized-h1', snippet: `${Math.round(fontSize)}px h1, ${textLen} chars${viewportDetail} "${headingText.slice(0, 60)}"` }];
+  }
+  return [];
+}
+
+function checkElementOversizedH1(el, style, tag, window) {
+  if (tag !== 'h1') return [];
+  const fontSize = resolveFontSizePx(el, window);
+  const headingText = (el.textContent || '').trim().replace(/\s+/g, ' ');
+  return checkOversizedH1({ tag, fontSize, headingText });
+}
+
+function checkElementOversizedH1DOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (tag !== 'h1') return [];
+  const style = getComputedStyle(el);
+  const fontSize = parseFloat(style.fontSize) || 0;
+  const headingText = (el.textContent || '').trim().replace(/\s+/g, ' ');
+  const rect = el.getBoundingClientRect();
+  const viewportWidth = (typeof window !== 'undefined' ? window.innerWidth : 0) || 0;
+  const viewportHeight = (typeof window !== 'undefined' ? window.innerHeight : 0) || 0;
+  return checkOversizedH1({ tag, fontSize, headingText, rect, viewportWidth, viewportHeight });
+}
+
+// ─── GPT tell: hairline border + wide diffuse shadow (gated --gpt) ────────────
+const CSS_COLOR_TOKEN_RE = /(?:rgba?|hsla?|oklch|oklab|lab|lch|color)\([^)]*\)|#[0-9a-fA-F]{3,8}\b|\b(?:black|white|transparent|currentcolor)\b/gi;
+
+function shadowLayerAlpha(layer) {
+  CSS_COLOR_TOKEN_RE.lastIndex = 0;
+  const match = CSS_COLOR_TOKEN_RE.exec(layer);
+  if (!match) return 1;
+  if (match[0].toLowerCase() === 'transparent') return 0;
+  const parsed = parseAnyColor(match[0]);
+  return parsed ? (parsed.a ?? 1) : 1;
+}
+
+function shadowMaxBlurPx(boxShadow, { minAlpha = 0 } = {}) {
+  if (!boxShadow || boxShadow === 'none') return 0;
+  let maxBlur = 0;
+  // Split into layers on commas not inside parentheses (rgba(...) etc.).
+  for (const layer of boxShadow.split(/,(?![^()]*\))/)) {
+    if (shadowLayerAlpha(layer) < minAlpha) continue;
+    // Strip colors and keywords (rgba()/hsl()/hex/named/inset/px), leaving the
+    // ordered length tokens: offsetX offsetY blur [spread]. Static jsdom keeps
+    // unitless zeros ("0 0 24px"); browsers normalize to px ("0px 0px 24px") —
+    // both reduce to the same numbers here.
+    const cleaned = layer.replace(CSS_COLOR_TOKEN_RE, ' ').replace(/\b[a-z]+\b/gi, ' ');
+    const nums = [...cleaned.matchAll(/-?\d*\.?\d+/g)].map(m => parseFloat(m[0]));
+    if (nums.length >= 3) maxBlur = Math.max(maxBlur, nums[2]);
+  }
+  return maxBlur;
+}
+
+function cssColorAlpha(value) {
+  if (cssColorIsTransparent(value)) return 0;
+  const parsed = parseAnyColor(value);
+  return parsed ? (parsed.a ?? 1) : 1;
+}
+
+function checkGptThinBorderWideShadow({ borderWidths, borderColors, boxShadow }) {
+  const visibleThinBorders = borderWidths
+    .map((width, index) => ({ width, alpha: cssColorAlpha(borderColors?.[index] || '') }))
+    .filter(({ width, alpha }) => width > 0 && width <= 1.5 && alpha >= 0.28);
+  const maxBorder = Math.max(0, ...visibleThinBorders.map(({ width }) => width));
+  const blur = shadowMaxBlurPx(boxShadow, { minAlpha: 0.12 });
+  if (visibleThinBorders.length >= 2 && blur >= 16) {
+    return [{ id: 'gpt-thin-border-wide-shadow', snippet: `${maxBorder}px border + ${Math.round(blur)}px shadow blur` }];
+  }
+  return [];
+}
+
+function borderWidthsFromStyle(style) {
+  return [
+    parseFloat(style.borderTopWidth) || 0,
+    parseFloat(style.borderRightWidth) || 0,
+    parseFloat(style.borderBottomWidth) || 0,
+    parseFloat(style.borderLeftWidth) || 0,
+  ];
+}
+
+function borderColorsFromStyle(style) {
+  return [
+    style.borderTopColor || '',
+    style.borderRightColor || '',
+    style.borderBottomColor || '',
+    style.borderLeftColor || '',
+  ];
+}
+
+function checkElementGptBorderShadow(el, style) {
+  return checkGptThinBorderWideShadow({ borderWidths: borderWidthsFromStyle(style), borderColors: borderColorsFromStyle(style), boxShadow: style.boxShadow || '' });
+}
+
+function checkElementGptBorderShadowDOM(el) {
+  const style = getComputedStyle(el);
+  return checkGptThinBorderWideShadow({ borderWidths: borderWidthsFromStyle(style), borderColors: borderColorsFromStyle(style), boxShadow: style.boxShadow || '' });
+}
+
+// ─── Clipped overflow container ───────────────────────────────────────────────
+// A clipping container (overflow hidden/clip, not a scroll region) wrapping an
+// absolutely/fixed-positioned descendant clips popovers/menus that must escape.
+function classSelector(el) {
+  const cls = (el.getAttribute ? el.getAttribute('class') : el.className) || '';
+  const tokens = String(cls).trim().split(/\s+/).filter(Boolean);
+  const tag = el.tagName ? el.tagName.toLowerCase() : 'el';
+  return tokens.length ? `${tag}.${tokens.join('.')}` : tag;
+}
+
+function positionedChildIsDecorative(child) {
+  if (!child || typeof child.getAttribute !== 'function') return false;
+  if (child.closest?.('[aria-hidden="true"]')) return true;
+  const role = (child.getAttribute('role') || '').toLowerCase();
+  if (role === 'none' || role === 'presentation') return true;
+  const tag = child.tagName ? child.tagName.toLowerCase() : '';
+  if (['img', 'svg', 'canvas', 'video'].includes(tag)) return true;
+  const ident = `${child.getAttribute('class') || ''} ${child.getAttribute('id') || ''}`;
+  if (
+    /\b(art|bg|background|badge|blob|crop|decor|dot|glow|grain|image|mask|ornament|overlay|photo|scrim|shadow|shine|texture)\b/i.test(ident) &&
+    !positionedChildHasSubstantiveContent(child)
+  ) {
+    return true;
+  }
+  return false;
+}
+
+const POSITIONED_CHILD_INTERACTIVE_SELECTOR = [
+  'a[href]',
+  'button',
+  'input',
+  'select',
+  'summary',
+  'textarea',
+  '[tabindex]:not([tabindex="-1"])',
+  '[role="button"]',
+  '[role="dialog"]',
+  '[role="link"]',
+  '[role="listbox"]',
+  '[role="menu"]',
+  '[role="menuitem"]',
+  '[role="option"]',
+  '[role="tooltip"]',
+].join(',');
+
+function positionedChildHasSubstantiveContent(child) {
+  const text = (child.textContent || '').replace(/\s+/g, ' ').trim();
+  if (text.length > 0) return true;
+  if (typeof child.matches === 'function') {
+    try {
+      if (child.matches(POSITIONED_CHILD_INTERACTIVE_SELECTOR)) return true;
+    } catch {}
+  }
+  if (typeof child.querySelector === 'function') {
+    try {
+      if (child.querySelector(POSITIONED_CHILD_INTERACTIVE_SELECTOR)) return true;
+    } catch {}
+  }
+  return false;
+}
+
+function clippingContainerIsIntentionalViewport(el) {
+  if (!el || typeof el.getAttribute !== 'function') return false;
+  const roleDescription = (el.getAttribute('aria-roledescription') || '').toLowerCase();
+  if (/\b(carousel|slider)\b/.test(roleDescription)) return true;
+  const ident = `${el.getAttribute('class') || ''} ${el.getAttribute('id') || ''}`.toLowerCase();
+  return /\b(carousel|comparison|compare|fisheye|marquee|preview|scroller|slider|slideshow|split|viewport)\b/.test(ident) ||
+    /\b(demo-area|demo-stage|demo-viewport)\b/.test(ident);
+}
+
+function elementRect(el) {
+  if (!el || typeof el.getBoundingClientRect !== 'function') return null;
+  try {
+    const rect = el.getBoundingClientRect();
+    if (!rect) return null;
+    const values = [rect.top, rect.right, rect.bottom, rect.left, rect.width, rect.height];
+    if (!values.every(Number.isFinite)) return null;
+    if (rect.width <= 0 && rect.height <= 0) return null;
+    return rect;
+  } catch {
+    return null;
+  }
+}
+
+function positionedStyleImpliesEscape(style) {
+  const values = [
+    style.top,
+    style.right,
+    style.bottom,
+    style.left,
+    style.inset,
+    style.insetBlock,
+    style.insetInline,
+    style.insetBlockStart,
+    style.insetBlockEnd,
+    style.insetInlineStart,
+    style.insetInlineEnd,
+  ].filter(Boolean).map(value => String(value).trim().toLowerCase());
+  for (const value of values) {
+    if (/(^|[\s(])-+(?:\d|\.)/.test(value)) return true;
+    if (/(^|[\s(])100(?:\.0+)?%/.test(value)) return true;
+  }
+  return false;
+}
+
+function positionedChildEscapesClip(el, child, clipX, clipY) {
+  const parentRect = elementRect(el);
+  const childRect = elementRect(child);
+  if (!parentRect || !childRect) return null;
+  const threshold = 2;
+  return Boolean(
+    (clipX && (childRect.left < parentRect.left - threshold || childRect.right > parentRect.right + threshold)) ||
+    (clipY && (childRect.top < parentRect.top - threshold || childRect.bottom > parentRect.bottom + threshold))
+  );
+}
+
+function checkClippedOverflow(el, style, getStyle) {
+  const clips = (v) => v === 'hidden' || v === 'clip';
+  const scrolls = (v) => v === 'auto' || v === 'scroll';
+  const ox = style.overflowX || '', oy = style.overflowY || '', ov = style.overflow || '';
+  const clipX = clips(ox) || clips(ov);
+  const clipY = clips(oy) || clips(ov);
+  const anyClip = clipX || clipY;
+  const anyScroll = scrolls(ox) || scrolls(oy) || scrolls(ov);
+  if (!anyClip || anyScroll) return [];
+  if (clippingContainerIsIntentionalViewport(el)) return [];
+  if (!el.querySelectorAll) return [];
+  for (const child of el.querySelectorAll('*')) {
+    const childStyle = getStyle(child);
+    const pos = childStyle.position || '';
+    if (pos === 'absolute' || pos === 'fixed') {
+      if (positionedChildIsDecorative(child)) continue;
+      const escapes = positionedChildEscapesClip(el, child, clipX, clipY);
+      if (escapes === false) continue;
+      if (escapes === null && !positionedStyleImpliesEscape(childStyle)) continue;
+      return [{ id: 'clipped-overflow-container', snippet: `${classSelector(el)} clips a positioned child` }];
+    }
+  }
+  return [];
+}
+
+function checkElementClippedOverflow(el, style, tag, window) {
+  return checkClippedOverflow(el, style, (n) => window.getComputedStyle(n));
+}
+
+function checkElementClippedOverflowDOM(el) {
+  const style = getComputedStyle(el);
+  return checkClippedOverflow(el, style, (n) => getComputedStyle(n));
+}
+
+// ─── Text overflow (browser-only: needs scrollWidth/clientWidth) ──────────────
+const TEXT_OVERFLOW_SKIP_TAGS = new Set(['pre', 'code', 'textarea', 'svg', 'canvas', 'select', 'option', 'marquee']);
+
+function metricLengthPx(value, fontSizePx = 16) {
+  if (typeof value === 'number' && Number.isFinite(value)) return value;
+  if (typeof value !== 'string') return null;
+  return resolveLengthPx(value, fontSizePx);
+}
+
+function firstMetricLengthPx(fontSizePx, ...values) {
+  for (const value of values) {
+    const parsed = metricLengthPx(value, fontSizePx);
+    if (parsed !== null) return parsed;
+  }
+  return null;
+}
+
+function expandBoxShorthand(parts) {
+  if (parts.length === 1) return [parts[0], parts[0], parts[0], parts[0]];
+  if (parts.length === 2) return [parts[0], parts[1], parts[0], parts[1]];
+  if (parts.length === 3) return [parts[0], parts[1], parts[2], parts[1]];
+  return [parts[0], parts[1], parts[2], parts[3]];
+}
+
+function clippedByInset(clipPath) {
+  const match = String(clipPath || '').trim().toLowerCase().match(/^inset\s*\(([^)]*)\)$/);
+  if (!match) return false;
+  const beforeRound = match[1].split(/\s+round\s+/)[0].trim();
+  if (!beforeRound) return false;
+  const values = expandBoxShorthand(beforeRound.split(/\s+/).slice(0, 4));
+  const percents = values.map(value => String(value).trim().match(/^(-?\d+(?:\.\d+)?)%$/));
+  if (percents.some(match => !match)) return false;
+  const [top, right, bottom, left] = percents.map(match => parseFloat(match[1]));
+  return top + bottom >= 100 || left + right >= 100;
+}
+
+function clippedByRect(clip) {
+  const match = String(clip || '').trim().toLowerCase().match(/^rect\s*\(([^)]*)\)$/);
+  if (!match) return false;
+  const values = match[1].split(/[,\s]+/).map(value => value.trim()).filter(Boolean);
+  if (values.length !== 4) return false;
+  const [top, right, bottom, left] = values.map(value => metricLengthPx(value, 16));
+  if ([top, right, bottom, left].some(value => value === null)) return false;
+  return bottom <= top || right <= left;
+}
+
+function isScreenReaderOnlyTextStyle(style, metrics = {}) {
+  if (!style) return false;
+  const overflowValues = [style.overflow, style.overflowX, style.overflowY]
+    .map(value => String(value || '').toLowerCase());
+  const clipsOverflow = overflowValues.some(value => value === 'hidden' || value === 'clip');
+
+  const fontSize = metricLengthPx(style.fontSize, 16) || 16;
+  const width = firstMetricLengthPx(fontSize, metrics.width, metrics.clientWidth, style.width, style.inlineSize);
+  const height = firstMetricLengthPx(fontSize, metrics.height, metrics.clientHeight, style.height, style.blockSize);
+  const isTiny = width !== null && height !== null && width <= 2 && height <= 2;
+  const isAbsolutelyHidden = String(style.position || '').toLowerCase() === 'absolute' && isTiny && clipsOverflow;
+
+  const clipPath = String(style.clipPath || style.webkitClipPath || '').trim();
+  const clip = String(style.clip || '').trim();
+  return isAbsolutelyHidden || clippedByInset(clipPath) || clippedByRect(clip);
+}
+
+function isRenderedForBrowserRule(el) {
+  for (let cur = el; cur && cur.nodeType === 1; cur = cur.parentElement) {
+    if (cur.getAttribute?.('aria-hidden') === 'true') return false;
+    const style = getComputedStyle(cur);
+    const visibility = String(style.visibility || '').toLowerCase();
+    if (style.display === 'none' || visibility === 'hidden' || visibility === 'collapse') return false;
+    if ((parseFloat(style.opacity) || 0) <= 0.01) return false;
+    if (String(style.contentVisibility || '').toLowerCase() === 'hidden') return false;
+  }
+  return true;
+}
+
+function checkElementTextOverflowDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (TEXT_OVERFLOW_SKIP_TAGS.has(tag)) return [];
+  if (!isRenderedForBrowserRule(el)) return [];
+  // Only the element that actually owns overflowing text — not its ancestors,
+  // which inherit a wider scrollWidth from the spilling descendant.
+  const hasDirectText = [...el.childNodes].some(n => n.nodeType === 3 && n.textContent.trim().length > 0);
+  if (!hasDirectText) return [];
+  const style = getComputedStyle(el);
+  const rect = el.getBoundingClientRect ? el.getBoundingClientRect() : null;
+  if (isScreenReaderOnlyTextStyle(style, {
+    width: rect?.width,
+    height: rect?.height,
+    clientWidth: el.clientWidth,
+    clientHeight: el.clientHeight,
+  })) return [];
+  const isScrollRegion = (s) => /(auto|scroll)/.test(s.overflowX || '') || /(auto|scroll)/.test(s.overflow || '');
+  if (isScrollRegion(style)) return [];
+  // A scrollable ancestor means this overflow is intentional and scrollable.
+  for (let p = el.parentElement; p; p = p.parentElement) {
+    if (isScrollRegion(getComputedStyle(p))) return [];
+  }
+  const delta = el.scrollWidth - el.clientWidth;
+  if (el.clientWidth > 0 && delta >= 16) {
+    return [{ id: 'text-overflow', snippet: `${classSelector(el)} overflows its box by ${Math.round(delta)}px` }];
+  }
+  return [];
+}
+
+// --- cli/engine/browser/injected/index.mjs ---
+const IS_BROWSER = typeof window !== 'undefined';
+
+// ─── Section 7: Browser UI (IS_BROWSER only) ────────────────────────────────
+
+if (IS_BROWSER) {
+  // Detect extension mode via the script tag's data attribute or the document element fallback.
+  // currentScript is reliable for synchronously-executing scripts (which our IIFE is).
+  const _myScript = document.currentScript;
+  const EXTENSION_MODE = (_myScript && _myScript.dataset.impeccableExtension === 'true')
+    || document.documentElement.dataset.impeccableExtension === 'true';
+
+  // Kinpaku gold — pinned to the site's brand token (see
+  // site/styles/kinpaku-tokens.css --ks-kinpaku). Keep this in sync with
+  // the picker's C.brand in skill/scripts/live-browser.js and the kit's
+  // picker section in site/styles/kinpaku-kit.css.
+  //
+  // One color across both light and dark host pages. The outline is a
+  // 2px gesture pointing at an element + a labeled tag — it's a marker,
+  // not body text, so it doesn't need WCAG AA against the page. The
+  // label text inside the gold tag is dark (LABEL_INK) which has ~16:1
+  // against the leaf gold, so reading the rule name is solid in both
+  // modes. Hover deepens the gold (preserves chroma — never drops it,
+  // dropping chroma washes the gold into a sand/olive tone).
+  const BRAND_COLOR = 'oklch(84% 0.19 80.46)';
+  const BRAND_COLOR_HOVER = 'oklch(74% 0.18 80)';
+  const LABEL_INK = 'oklch(4% 0.004 95)';
+  const LABEL_BG = BRAND_COLOR;
+  const OUTLINE_COLOR = BRAND_COLOR;
+
+  // Inject hover styles via CSS (more reliable than JS event listeners)
+  const styleEl = document.createElement('style');
+  styleEl.textContent = `
+    @keyframes impeccable-reveal {
+      from { opacity: 0; }
+      to { opacity: 1; }
+    }
+    .impeccable-overlay:not(.impeccable-banner) {
+      pointer-events: none;
+      outline: 2px solid ${OUTLINE_COLOR};
+      border-radius: 4px;
+      transition: outline-color 0.15s ease;
+      animation: impeccable-reveal 0.4s cubic-bezier(0.16, 1, 0.3, 1) both;
+      animation-play-state: paused;
+      border-top-left-radius: 0;
+    }
+    .impeccable-overlay.impeccable-visible {
+      animation-play-state: running;
+    }
+    .impeccable-overlay.impeccable-hover {
+      outline-color: ${BRAND_COLOR_HOVER};
+      z-index: 100001 !important;
+    }
+    .impeccable-overlay.impeccable-hover .impeccable-label {
+      background: ${BRAND_COLOR_HOVER};
+    }
+    .impeccable-overlay.impeccable-spotlight {
+      z-index: 100002 !important;
+    }
+    .impeccable-overlay.impeccable-spotlight-dimmed {
+      opacity: 0.15 !important;
+      animation: none !important;
+      filter: blur(3px);
+    }
+    .impeccable-spotlight-backdrop {
+      position: fixed;
+      top: 0; left: 0; right: 0; bottom: 0;
+      backdrop-filter: blur(3px) brightness(0.6);
+      -webkit-backdrop-filter: blur(3px) brightness(0.6);
+      pointer-events: none;
+      z-index: 99998;
+      opacity: 0;
+      outline: none !important;
+      animation: none !important;
+    }
+    .impeccable-spotlight-backdrop.impeccable-visible {
+      opacity: 1;
+    }
+    .impeccable-hidden .impeccable-overlay${EXTENSION_MODE ? '' : ':not(.impeccable-banner)'} {
+      display: none !important;
+    }
+  `;
+  (document.head || document.documentElement).appendChild(styleEl);
+
+  // Spotlight backdrop element (created lazily on first use)
+  let spotlightBackdrop = null;
+  let spotlightTarget = null;
+
+  function getSpotlightBackdrop() {
+    if (!spotlightBackdrop) {
+      spotlightBackdrop = document.createElement('div');
+      spotlightBackdrop.className = 'impeccable-spotlight-backdrop';
+      document.body.appendChild(spotlightBackdrop);
+    }
+    return spotlightBackdrop;
+  }
+
+  function updateSpotlightClipPath() {
+    if (!spotlightBackdrop || !spotlightTarget) return;
+    const r = spotlightTarget.getBoundingClientRect();
+    // Match the overlay's outer edge: element rect + 4px (2px overlay offset + 2px outline width)
+    const inset = 4;
+    const radius = 6; // outline border-radius (4) + outline width (2)
+    const x1 = r.left - inset;
+    const y1 = r.top - inset;
+    const x2 = r.right + inset;
+    const y2 = r.bottom + inset;
+    const vw = window.innerWidth;
+    const vh = window.innerHeight;
+    // Outer rect + rounded inner rect (evenodd creates a hole)
+    const path = `M0 0H${vw}V${vh}H0Z M${x1 + radius} ${y1}H${x2 - radius}A${radius} ${radius} 0 0 1 ${x2} ${y1 + radius}V${y2 - radius}A${radius} ${radius} 0 0 1 ${x2 - radius} ${y2}H${x1 + radius}A${radius} ${radius} 0 0 1 ${x1} ${y2 - radius}V${y1 + radius}A${radius} ${radius} 0 0 1 ${x1 + radius} ${y1}Z`;
+    spotlightBackdrop.style.clipPath = `path(evenodd, "${path}")`;
+  }
+
+  function showSpotlight(target) {
+    if (!target || !target.getBoundingClientRect) return;
+    // Respect the spotlightBlur setting: if disabled, don't show the backdrop
+    if (window.__IMPECCABLE_CONFIG__?.spotlightBlur === false) {
+      spotlightTarget = target;
+      return;
+    }
+    spotlightTarget = target;
+    const bd = getSpotlightBackdrop();
+    updateSpotlightClipPath();
+    bd.classList.add('impeccable-visible');
+  }
+
+  function hideSpotlight() {
+    spotlightTarget = null;
+    if (spotlightBackdrop) spotlightBackdrop.classList.remove('impeccable-visible');
+  }
+
+  function isInViewport(el) {
+    const r = el.getBoundingClientRect();
+    return r.top >= 0 && r.left >= 0 && r.bottom <= window.innerHeight && r.right <= window.innerWidth;
+  }
+
+  // Reposition spotlight on scroll/resize
+  window.addEventListener('scroll', () => {
+    if (spotlightTarget) updateSpotlightClipPath();
+  }, { passive: true });
+  window.addEventListener('resize', () => {
+    if (spotlightTarget) updateSpotlightClipPath();
+  });
+
+  const overlays = [];
+  const TYPE_LABELS = {};
+  const RULE_CATEGORY = {};
+  for (const ap of ANTIPATTERNS) {
+    TYPE_LABELS[ap.id] = ap.name.toLowerCase();
+    RULE_CATEGORY[ap.id] = ap.category || 'quality';
+  }
+
+  function isInFixedContext(el) {
+    let p = el;
+    while (p && p !== document.body) {
+      if (getComputedStyle(p).position === 'fixed') return true;
+      p = p.parentElement;
+    }
+    return false;
+  }
+
+  function positionOverlay(overlay) {
+    const el = overlay._targetEl;
+    if (!el) return;
+    const rect = el.getBoundingClientRect();
+    if (overlay._isFixed) {
+      // Viewport-relative coords for fixed targets
+      overlay.style.top = `${rect.top - 2}px`;
+      overlay.style.left = `${rect.left - 2}px`;
+    } else {
+      // Document-relative coords for normal targets
+      overlay.style.top = `${rect.top + scrollY - 2}px`;
+      overlay.style.left = `${rect.left + scrollX - 2}px`;
+    }
+    overlay.style.width = `${rect.width + 4}px`;
+    overlay.style.height = `${rect.height + 4}px`;
+  }
+
+  function repositionOverlays() {
+    for (const o of overlays) {
+      if (!o._targetEl || o.classList.contains('impeccable-banner')) continue;
+      // Skip overlays whose target is currently hidden (display: none on the overlay)
+      if (o.style.display === 'none') continue;
+      positionOverlay(o);
+    }
+  }
+
+  let resizeRAF;
+  const onResize = () => {
+    cancelAnimationFrame(resizeRAF);
+    resizeRAF = requestAnimationFrame(repositionOverlays);
+  };
+  window.addEventListener('resize', onResize);
+  // Reposition on scroll too -- catches sticky/parallax shifts
+  window.addEventListener('scroll', onResize, { passive: true });
+  // Reposition when body resizes (lazy-loaded images, dynamic content, fonts loading)
+  if (typeof ResizeObserver !== 'undefined') {
+    const bodyResizeObserver = new ResizeObserver(onResize);
+    bodyResizeObserver.observe(document.body);
+  }
+
+  // Track target element visibility via IntersectionObserver.
+  // Uses a huge rootMargin so all *rendered* elements count as intersecting,
+  // while display:none / closed <details> / hidden modals etc. do not.
+  // This is event-driven -- no polling needed.
+  let overlayIndex = 0;
+  const visibilityObserver = new IntersectionObserver((entries) => {
+    for (const entry of entries) {
+      const overlay = entry.target._impeccableOverlay;
+      if (!overlay) continue;
+      if (entry.isIntersecting) {
+        overlay.style.display = '';
+        positionOverlay(overlay);
+        if (!overlay._revealed) {
+          overlay._revealed = true;
+          if (firstScanDone) {
+            // Subsequent reveals (re-scans, scroll-into-view): instant, no animation
+            overlay.style.animation = 'none';
+          } else {
+            // Initial scan: staggered cascade reveal
+            overlay.style.animationDelay = `${Math.min((overlay._staggerIndex || 0) * 60, 600)}ms`;
+          }
+          requestAnimationFrame(() => {
+            overlay.classList.add('impeccable-visible');
+            if (overlay._checkLabel) overlay._checkLabel();
+          });
+        }
+      } else {
+        overlay.style.display = 'none';
+      }
+    }
+  }, { rootMargin: '99999px' });
+
+  function detachOverlay(overlay) {
+    if (!overlay) return;
+    if (typeof overlay._cleanup === 'function') {
+      try { overlay._cleanup(); } catch { /* best effort overlay teardown */ }
+    }
+    if (overlay._targetEl && overlay._targetEl._impeccableOverlay === overlay) {
+      visibilityObserver.unobserve(overlay._targetEl);
+      delete overlay._targetEl._impeccableOverlay;
+    }
+    const idx = overlays.indexOf(overlay);
+    if (idx >= 0) overlays.splice(idx, 1);
+    overlay.remove();
+  }
+
+  // Reposition overlays after CSS transitions end (e.g. reveal animations).
+  // Listens at document level so it catches transitions on ancestor elements
+  // (the transform may be on a parent, not the flagged element itself).
+  document.addEventListener('transitionend', (e) => {
+    if (e.propertyName !== 'transform') return;
+    for (const o of overlays) {
+      if (!o._targetEl || o.classList.contains('impeccable-banner') || o.style.display === 'none') continue;
+      if (e.target === o._targetEl || e.target.contains(o._targetEl)) {
+        positionOverlay(o);
+      }
+    }
+  });
+
+  const highlight = function(el, findings) {
+    if (el._impeccableOverlay) detachOverlay(el._impeccableOverlay);
+    const hasSlop = findings.some(f => RULE_CATEGORY[f.type || f.id] === 'slop');
+
+    const fixed = isInFixedContext(el);
+    const rect = el.getBoundingClientRect();
+    const outline = document.createElement('div');
+    outline.className = 'impeccable-overlay';
+    outline._targetEl = el;
+    outline._isFixed = fixed;
+    Object.assign(outline.style, {
+      position: fixed ? 'fixed' : 'absolute',
+      top: fixed ? `${rect.top - 2}px` : `${rect.top + scrollY - 2}px`,
+      left: fixed ? `${rect.left - 2}px` : `${rect.left + scrollX - 2}px`,
+      width: `${rect.width + 4}px`, height: `${rect.height + 4}px`,
+      zIndex: '99999', boxSizing: 'border-box',
+    });
+
+    // Build per-finding label entries: ✦ prefix for slop
+    const entries = findings.map(f => {
+      const name = TYPE_LABELS[f.type || f.id] || f.type || f.id;
+      const prefix = RULE_CATEGORY[f.type || f.id] === 'slop' ? '\u2726 ' : '';
+      return { name: prefix + name, detail: f.detail || f.snippet };
+    });
+    const allText = entries.map(e => e.name).join(', ');
+
+    const label = document.createElement('div');
+    label.className = 'impeccable-label';
+    Object.assign(label.style, {
+      position: 'absolute', bottom: '100%', left: '-2px',
+      display: 'flex', alignItems: 'center',
+      whiteSpace: 'nowrap',
+      fontSize: '11px', fontWeight: '600', letterSpacing: '0.02em',
+      color: LABEL_INK, lineHeight: '14px',
+      background: LABEL_BG,
+      fontFamily: 'system-ui, sans-serif',
+      borderRadius: '4px 4px 0 0',
+    });
+
+    const textSpan = document.createElement('span');
+    textSpan.style.padding = '3px 8px';
+    textSpan.textContent = allText;
+    label.appendChild(textSpan);
+
+    // State for cycling mode
+    let cycleMode = false;
+    let cycleIndex = 0;
+    let isHovered = false;
+    let prevBtn, nextBtn;
+
+    function updateCycleText() {
+      const e = entries[cycleIndex];
+      textSpan.textContent = isHovered ? e.detail : e.name;
+    }
+
+    function enableCycleMode() {
+      if (cycleMode || entries.length < 2) return;
+      cycleMode = true;
+
+      const btnStyle = {
+        background: 'none', border: 'none', color: 'rgba(255,255,255,0.7)',
+        fontSize: '11px', cursor: 'pointer', padding: '3px 4px',
+        fontFamily: 'system-ui, sans-serif', lineHeight: '14px',
+        pointerEvents: 'auto',
+      };
+
+      const navGroup = document.createElement('span');
+      Object.assign(navGroup.style, {
+        display: 'inline-flex', alignItems: 'center', flexShrink: '0',
+      });
+
+      prevBtn = document.createElement('button');
+      prevBtn.textContent = '\u2039';
+      Object.assign(prevBtn.style, btnStyle);
+      prevBtn.style.paddingLeft = '6px';
+      prevBtn.addEventListener('click', (e) => {
+        e.stopPropagation();
+        cycleIndex = (cycleIndex - 1 + entries.length) % entries.length;
+        updateCycleText();
+      });
+
+      nextBtn = document.createElement('button');
+      nextBtn.textContent = '\u203A';
+      Object.assign(nextBtn.style, btnStyle);
+      nextBtn.style.paddingRight = '2px';
+      nextBtn.addEventListener('click', (e) => {
+        e.stopPropagation();
+        cycleIndex = (cycleIndex + 1) % entries.length;
+        updateCycleText();
+      });
+
+      navGroup.appendChild(prevBtn);
+      navGroup.appendChild(nextBtn);
+      label.insertBefore(navGroup, textSpan);
+      textSpan.style.padding = '3px 8px 3px 4px';
+      updateCycleText();
+    }
+
+    outline.appendChild(label);
+
+    // Start hidden; the IntersectionObserver will show it once the target is rendered
+    outline.style.display = 'none';
+    outline._staggerIndex = overlayIndex++;
+    el._impeccableOverlay = outline;
+    visibilityObserver.observe(el);
+
+    // After first paint, check label width vs outline
+    outline._checkLabel = () => {
+      if (entries.length > 1 && label.offsetWidth > outline.offsetWidth) {
+        enableCycleMode();
+      }
+    };
+
+    // Hover: show detail text, darken
+    const onMouseEnter = () => {
+      isHovered = true;
+      outline.classList.add('impeccable-hover');
+      outline.style.outlineColor = BRAND_COLOR_HOVER;
+      label.style.background = BRAND_COLOR_HOVER;
+      if (cycleMode) {
+        updateCycleText();
+      } else {
+        textSpan.textContent = entries.map(e => e.detail).join(' | ');
+      }
+    };
+    const onMouseLeave = () => {
+      isHovered = false;
+      outline.classList.remove('impeccable-hover');
+      outline.style.outlineColor = '';
+      label.style.background = LABEL_BG;
+      if (cycleMode) {
+        updateCycleText();
+      } else {
+        textSpan.textContent = allText;
+      }
+    };
+    el.addEventListener('mouseenter', onMouseEnter);
+    el.addEventListener('mouseleave', onMouseLeave);
+    outline._cleanup = () => {
+      el.removeEventListener('mouseenter', onMouseEnter);
+      el.removeEventListener('mouseleave', onMouseLeave);
+    };
+
+    document.body.appendChild(outline);
+    overlays.push(outline);
+  };
+
+  const showPageBanner = function(findings) {
+    if (!findings.length) return;
+    const banner = document.createElement('div');
+    banner.className = 'impeccable-overlay impeccable-banner';
+    Object.assign(banner.style, {
+      position: 'fixed', top: '0', left: '0', right: '0', zIndex: '100000',
+      background: LABEL_BG, color: LABEL_INK,
+      fontFamily: 'system-ui, sans-serif', fontSize: '13px',
+      display: 'flex', alignItems: 'center', pointerEvents: 'auto',
+      height: '36px', overflow: 'hidden', maxWidth: '100vw',
+      transform: 'translateY(-100%)',
+      transition: 'transform 0.4s cubic-bezier(0.16, 1, 0.3, 1)',
+    });
+    requestAnimationFrame(() => requestAnimationFrame(() => {
+      banner.style.transform = 'translateY(0)';
+    }));
+
+    // Scrollable findings area
+    const scrollArea = document.createElement('div');
+    Object.assign(scrollArea.style, {
+      flex: '1', minWidth: '0', overflowX: 'auto', overflowY: 'hidden',
+      display: 'flex', gap: '8px', alignItems: 'center',
+      padding: '0 12px', scrollSnapType: 'x mandatory',
+      scrollbarWidth: 'none',
+    });
+    for (const f of findings) {
+      const prefix = RULE_CATEGORY[f.type] === 'slop' ? '\u2726 ' : '';
+      const tag = document.createElement('span');
+      tag.textContent = `${prefix}${TYPE_LABELS[f.type] || f.type}: ${f.detail}`;
+      Object.assign(tag.style, {
+        background: 'rgba(255,255,255,0.15)', padding: '2px 8px',
+        borderRadius: '3px', fontSize: '12px', fontFamily: 'ui-monospace, monospace',
+        whiteSpace: 'nowrap', flexShrink: '0', scrollSnapAlign: 'start',
+      });
+      scrollArea.appendChild(tag);
+    }
+    banner.appendChild(scrollArea);
+
+    // Controls area (only in standalone mode, not extension)
+    if (!EXTENSION_MODE) {
+      const controls = document.createElement('div');
+      Object.assign(controls.style, {
+        display: 'flex', alignItems: 'center', gap: '2px',
+        padding: '0 8px', flexShrink: '0',
+      });
+
+      // Toggle visibility button
+      const toggle = document.createElement('button');
+      toggle.textContent = '\u25C9'; // circle with dot (visible state)
+      toggle.title = 'Toggle overlay visibility';
+      Object.assign(toggle.style, {
+        background: 'none', border: 'none',
+        color: 'white', fontSize: '16px', cursor: 'pointer', padding: '0 4px',
+        opacity: '0.85', transition: 'opacity 0.15s',
+      });
+      let overlaysVisible = true;
+      toggle.addEventListener('click', () => {
+        overlaysVisible = !overlaysVisible;
+        document.body.classList.toggle('impeccable-hidden', !overlaysVisible);
+        toggle.textContent = overlaysVisible ? '\u25C9' : '\u25CB'; // filled vs empty circle
+        toggle.style.opacity = overlaysVisible ? '0.85' : '0.5';
+      });
+      controls.appendChild(toggle);
+
+      // Close button
+      const close = document.createElement('button');
+      close.textContent = '\u00d7';
+      close.title = 'Dismiss banner';
+      Object.assign(close.style, {
+        background: 'none', border: 'none',
+        color: 'white', fontSize: '18px', cursor: 'pointer', padding: '0 4px',
+      });
+      close.addEventListener('click', () => banner.remove());
+      controls.appendChild(close);
+
+      banner.appendChild(controls);
+    }
+    document.body.appendChild(banner);
+    overlays.push(banner);
+  };
+
+  // Heuristic for skipping CSS-in-JS hashed class names like "css-1a2b3c" or "_2x4hG_".
+  // These change between builds and produce brittle, ugly selectors.
+  function isLikelyHashedClass(c) {
+    if (!c) return true;
+    if (/^(css|sc|emotion|jsx|module)-[\w-]{4,}$/i.test(c)) return true;
+    if (/^_[\w-]{5,}$/.test(c)) return true;
+    if (/^[a-z0-9]{6,}$/i.test(c) && /\d/.test(c)) return true;
+    return false;
+  }
+
+  function buildSelectorSegment(el) {
+    const tag = el.tagName.toLowerCase();
+    let sel = tag;
+
+    if (el.classList && el.classList.length > 0) {
+      const classes = [...el.classList]
+        .filter(c => !c.startsWith('impeccable-') && !isLikelyHashedClass(c))
+        .slice(0, 2);
+      if (classes.length > 0) {
+        sel += '.' + classes.map(c => CSS.escape(c)).join('.');
+      }
+    }
+
+    // Disambiguate among siblings only if the parent has multiple matches
+    const parent = el.parentElement;
+    if (parent) {
+      try {
+        const matching = parent.querySelectorAll(':scope > ' + sel);
+        if (matching.length > 1) {
+          const sameType = [...parent.children].filter(c => c.tagName === el.tagName);
+          const idx = sameType.indexOf(el) + 1;
+          sel += `:nth-of-type(${idx})`;
+        }
+      } catch {
+        const idx = [...parent.children].indexOf(el) + 1;
+        sel = `${tag}:nth-child(${idx})`;
+      }
+    }
+    return sel;
+  }
+
+  function generateSelector(el) {
+    if (el === document.body) return 'body';
+    if (el === document.documentElement) return 'html';
+    if (el.id) return '#' + CSS.escape(el.id);
+
+    const parts = [];
+    let current = el;
+    let depth = 0;
+    const MAX_DEPTH = 10;
+
+    while (current && current !== document.body && current !== document.documentElement && depth < MAX_DEPTH) {
+      parts.unshift(buildSelectorSegment(current));
+
+      // Anchor on an ancestor's ID and stop walking up
+      if (current.id) {
+        parts[0] = '#' + CSS.escape(current.id);
+        break;
+      }
+
+      // Stop as soon as the partial selector uniquely identifies the target
+      const trySelector = parts.join(' > ');
+      try {
+        const matches = document.querySelectorAll(trySelector);
+        if (matches.length === 1 && matches[0] === el) {
+          return trySelector;
+        }
+      } catch { /* invalid selector — keep walking */ }
+
+      current = current.parentElement;
+      depth++;
+    }
+
+    return parts.join(' > ');
+  }
+
+  function getDirectText(el) {
+    return [...el.childNodes]
+      .filter(n => n.nodeType === 3)
+      .map(n => n.textContent || '')
+      .join('');
+  }
+
+  function getDirectTextRect(el) {
+    const rects = [];
+    for (const node of el.childNodes) {
+      if (node.nodeType !== 3 || !(node.textContent || '').trim()) continue;
+      const range = document.createRange();
+      range.selectNodeContents(node);
+      for (const rect of range.getClientRects()) {
+        if (rect.width >= 1 && rect.height >= 1) rects.push(rect);
+      }
+      range.detach?.();
+    }
+    if (rects.length === 0) return null;
+    const left = Math.min(...rects.map(r => r.left));
+    const top = Math.min(...rects.map(r => r.top));
+    const right = Math.max(...rects.map(r => r.right));
+    const bottom = Math.max(...rects.map(r => r.bottom));
+    return {
+      left,
+      top,
+      right,
+      bottom,
+      width: right - left,
+      height: bottom - top,
+      x: left,
+      y: top,
+    };
+  }
+
+  function collectVisualContrastReasons(el, style) {
+    const reasons = new Set();
+    const bgClip = style.webkitBackgroundClip || style.backgroundClip || '';
+    const ownBgImage = style.backgroundImage || '';
+    if (bgClip === 'text' && ownBgImage && ownBgImage !== 'none') {
+      reasons.add('background-clip text');
+    }
+    if (style.textShadow && style.textShadow !== 'none') reasons.add('text shadow');
+
+    let current = el;
+    while (current && current.nodeType === 1) {
+      const tag = current.tagName?.toLowerCase();
+      const currentStyle = getComputedStyle(current);
+      const bgImage = currentStyle.backgroundImage || '';
+      const isDocumentSurface = tag === 'body' || tag === 'html';
+
+      if (!isDocumentSurface && bgImage && bgImage !== 'none') {
+        if (/url\s*\(/i.test(bgImage)) reasons.add('image background');
+        if (/gradient/i.test(bgImage)) reasons.add('gradient background');
+      }
+      if (parseFloat(currentStyle.opacity) < 0.99) reasons.add('opacity stack');
+      if (currentStyle.mixBlendMode && currentStyle.mixBlendMode !== 'normal') reasons.add('blend mode');
+      if (currentStyle.filter && currentStyle.filter !== 'none') reasons.add('filter');
+      if (currentStyle.backdropFilter && currentStyle.backdropFilter !== 'none') reasons.add('backdrop filter');
+
+      const solidBg = parseRgb(currentStyle.backgroundColor);
+      if (solidBg && solidBg.a >= 0.95 && (!bgImage || bgImage === 'none')) break;
+      current = current.parentElement;
+    }
+
+    const sampleRect = getDirectTextRect(el) || el.getBoundingClientRect();
+    if (sampleRect && document.elementsFromPoint) {
+      const points = [
+        [sampleRect.left + sampleRect.width / 2, sampleRect.top + sampleRect.height / 2],
+        [sampleRect.left + Math.min(sampleRect.width - 1, Math.max(1, sampleRect.width * 0.25)), sampleRect.top + sampleRect.height / 2],
+        [sampleRect.left + Math.min(sampleRect.width - 1, Math.max(1, sampleRect.width * 0.75)), sampleRect.top + sampleRect.height / 2],
+      ];
+      for (const [x, y] of points) {
+        if (x < 0 || y < 0 || x > window.innerWidth || y > window.innerHeight) continue;
+        const stack = document.elementsFromPoint(x, y);
+        const selfIndex = stack.findIndex(node => node === el || el.contains(node) || node.contains?.(el));
+        if (selfIndex < 0) continue;
+        for (const node of stack.slice(selfIndex + 1)) {
+          const nodeTag = node.tagName?.toLowerCase();
+          if (nodeTag === 'img' || nodeTag === 'picture' || nodeTag === 'video' || nodeTag === 'canvas' || nodeTag === 'svg') {
+            reasons.add(`${nodeTag} underlay`);
+            break;
+          }
+        }
+      }
+    }
+
+    return [...reasons];
+  }
+
+  function collectVisualContrastCandidates(options = {}) {
+    const maxCandidates = Number.isFinite(options.maxCandidates) ? options.maxCandidates : 12;
+    const candidates = [];
+    for (const el of document.querySelectorAll('*')) {
+      if (candidates.length >= maxCandidates) break;
+      if (el.closest('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
+      if (el.closest('[id^="impeccable-live-"]')) continue;
+      if (el === document.body || el === document.documentElement) continue;
+      if (!isRenderedForBrowserRule(el)) continue;
+
+      const tag = el.tagName.toLowerCase();
+      const style = getComputedStyle(el);
+      if (style.display === 'none' || style.visibility === 'hidden') continue;
+      const directText = getDirectText(el);
+      const hasDirectText = directText.trim().length > 0;
+      if (!hasDirectText || isEmojiOnlyText(directText)) continue;
+
+      const bgColor = readOwnBackgroundColor(el, style);
+      const isStyledButton = (tag === 'a' || tag === 'button')
+        && bgColor && bgColor.a > 0.5;
+      if (SAFE_TAGS.has(tag) && !isStyledButton) continue;
+
+      const rect = getDirectTextRect(el) || el.getBoundingClientRect();
+      if (!rect || rect.width < 4 || rect.height < 4) continue;
+
+      const reasons = collectVisualContrastReasons(el, style);
+      if (reasons.length === 0) continue;
+
+      const textColor = parseRgb(style.color);
+      const fontSize = parseFloat(style.fontSize) || 16;
+      const fontWeight = parseInt(style.fontWeight) || 400;
+      const isLargeText = fontSize >= WCAG_LARGE_TEXT_PX || (fontSize >= WCAG_LARGE_BOLD_TEXT_PX && fontWeight >= 700);
+      const threshold = isLargeText ? 3.0 : 4.5;
+      const clip = {
+        x: Math.max(0, Math.floor(rect.left + window.scrollX - 2)),
+        y: Math.max(0, Math.floor(rect.top + window.scrollY - 2)),
+        width: Math.max(1, Math.ceil(rect.width + 4)),
+        height: Math.max(1, Math.ceil(rect.height + 4)),
+      };
+
+      candidates.push({
+        selector: generateSelector(el),
+        tagName: tag,
+        text: directText.trim().replace(/\s+/g, ' ').slice(0, 80),
+        threshold,
+        reasons,
+        clip,
+        textColor,
+        preferRenderedForeground: !textColor || textColor.a < 0.99 || reasons.some(reason =>
+          reason === 'opacity stack' ||
+          reason === 'blend mode' ||
+          reason === 'filter' ||
+          reason === 'backdrop filter' ||
+          reason === 'background-clip text'
+        ),
+        backgroundClipText: reasons.includes('background-clip text'),
+      });
+    }
+    return candidates;
+  }
+
+  const visualContrastImageCache = new Map();
+  const visualContrastRasterCache = new WeakMap();
+
+  function clampByte(value) {
+    return Math.max(0, Math.min(255, Math.round(value)));
+  }
+
+  function blendRgba(fg, bg) {
+    if (!fg) return bg || null;
+    if (!bg || fg.a == null || fg.a >= 0.999) {
+      return { r: clampByte(fg.r), g: clampByte(fg.g), b: clampByte(fg.b), a: fg.a == null ? 1 : fg.a };
+    }
+    const alpha = Math.max(0, Math.min(1, fg.a));
+    return {
+      r: clampByte(fg.r * alpha + bg.r * (1 - alpha)),
+      g: clampByte(fg.g * alpha + bg.g * (1 - alpha)),
+      b: clampByte(fg.b * alpha + bg.b * (1 - alpha)),
+      a: 1,
+    };
+  }
+
+  function pickWorstContrastColor(textColor, colors) {
+    const usable = (colors || []).filter(Boolean);
+    if (!usable.length) return null;
+    let worst = usable[0];
+    let worstRatio = contrastRatio(textColor, worst);
+    for (const color of usable.slice(1)) {
+      const ratio = contrastRatio(textColor, color);
+      if (ratio < worstRatio) {
+        worst = color;
+        worstRatio = ratio;
+      }
+    }
+    return worst;
+  }
+
+  function firstCssUrl(value) {
+    const match = String(value || '').match(/url\((?:"([^"]+)"|'([^']+)'|([^)]*))\)/i);
+    if (!match) return '';
+    return (match[1] || match[2] || match[3] || '').trim();
+  }
+
+  function getLayerValue(value, index = 0) {
+    return String(value || '').split(',')[index]?.trim() || '';
+  }
+
+  function parsePositionToken(token, container, painted) {
+    if (!token || token === 'center') return (container - painted) / 2;
+    if (token === 'left' || token === 'top') return 0;
+    if (token === 'right' || token === 'bottom') return container - painted;
+    if (/%$/.test(token)) {
+      const pct = parseFloat(token) / 100;
+      return (container - painted) * pct;
+    }
+    if (/px$/.test(token)) return parseFloat(token) || 0;
+    return (container - painted) / 2;
+  }
+
+  function parsePositionPair(positionValue) {
+    const tokens = String(positionValue || '50% 50%').trim().split(/\s+/).filter(Boolean);
+    const first = tokens[0] || '50%';
+    if (tokens.length < 2) {
+      if (first === 'top' || first === 'bottom') return ['50%', first];
+      return [first, '50%'];
+    }
+    return [first, tokens[1] || '50%'];
+  }
+
+  function resolvePaintedImageRect(containerRect, image, sizeValue, positionValue) {
+    const intrinsicWidth = image.naturalWidth || image.videoWidth || image.width || 1;
+    const intrinsicHeight = image.naturalHeight || image.videoHeight || image.height || 1;
+    let paintedWidth = intrinsicWidth;
+    let paintedHeight = intrinsicHeight;
+    const size = String(sizeValue || 'auto').trim();
+
+    if (size === 'cover' || size === 'contain') {
+      const scale = size === 'cover'
+        ? Math.max(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight)
+        : Math.min(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight);
+      paintedWidth = intrinsicWidth * scale;
+      paintedHeight = intrinsicHeight * scale;
+    } else if (size && size !== 'auto') {
+      const parts = size.split(/\s+/);
+      const widthToken = parts[0];
+      const heightToken = parts[1] || 'auto';
+      if (/%$/.test(widthToken)) paintedWidth = containerRect.width * (parseFloat(widthToken) / 100);
+      else if (/px$/.test(widthToken)) paintedWidth = parseFloat(widthToken) || paintedWidth;
+      if (heightToken === 'auto') paintedHeight = paintedWidth * (intrinsicHeight / intrinsicWidth);
+      else if (/%$/.test(heightToken)) paintedHeight = containerRect.height * (parseFloat(heightToken) / 100);
+      else if (/px$/.test(heightToken)) paintedHeight = parseFloat(heightToken) || paintedHeight;
+    }
+
+    const [xToken, yToken] = parsePositionPair(positionValue);
+    const positionX = parsePositionToken(xToken, containerRect.width, paintedWidth);
+    const positionY = parsePositionToken(yToken, containerRect.height, paintedHeight);
+    return {
+      left: containerRect.left + positionX,
+      top: containerRect.top + positionY,
+      width: paintedWidth,
+      height: paintedHeight,
+      intrinsicWidth,
+      intrinsicHeight,
+    };
+  }
+
+  function parseObjectPosition(positionValue) {
+    return parsePositionPair(positionValue);
+  }
+
+  function resolveObjectImageRect(containerRect, image, style) {
+    const intrinsicWidth = image.naturalWidth || image.videoWidth || image.width || 1;
+    const intrinsicHeight = image.naturalHeight || image.videoHeight || image.height || 1;
+    const fit = style.objectFit || 'fill';
+    let paintedWidth = containerRect.width;
+    let paintedHeight = containerRect.height;
+    if (fit === 'contain' || fit === 'cover') {
+      const scale = fit === 'cover'
+        ? Math.max(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight)
+        : Math.min(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight);
+      paintedWidth = intrinsicWidth * scale;
+      paintedHeight = intrinsicHeight * scale;
+    } else if (fit === 'none') {
+      paintedWidth = intrinsicWidth;
+      paintedHeight = intrinsicHeight;
+    } else if (fit === 'scale-down') {
+      const containScale = Math.min(containerRect.width / intrinsicWidth, containerRect.height / intrinsicHeight, 1);
+      paintedWidth = intrinsicWidth * containScale;
+      paintedHeight = intrinsicHeight * containScale;
+    }
+    const [xToken, yToken] = parseObjectPosition(style.objectPosition);
+    return {
+      left: containerRect.left + parsePositionToken(xToken, containerRect.width, paintedWidth),
+      top: containerRect.top + parsePositionToken(yToken, containerRect.height, paintedHeight),
+      width: paintedWidth,
+      height: paintedHeight,
+      intrinsicWidth,
+      intrinsicHeight,
+    };
+  }
+
+  function pointToImageSource(point, paintedRect) {
+    if (
+      point.x < paintedRect.left ||
+      point.y < paintedRect.top ||
+      point.x > paintedRect.left + paintedRect.width ||
+      point.y > paintedRect.top + paintedRect.height
+    ) {
+      return null;
+    }
+    return {
+      x: Math.max(0, Math.min(paintedRect.intrinsicWidth - 1, ((point.x - paintedRect.left) / paintedRect.width) * paintedRect.intrinsicWidth)),
+      y: Math.max(0, Math.min(paintedRect.intrinsicHeight - 1, ((point.y - paintedRect.top) / paintedRect.height) * paintedRect.intrinsicHeight)),
+    };
+  }
+
+  async function loadVisualContrastImage(src) {
+    if (!src) return null;
+    if (visualContrastImageCache.has(src)) return visualContrastImageCache.get(src);
+    const promise = new Promise(resolve => {
+      const img = new Image();
+      let settled = false;
+      const finish = value => {
+        if (settled) return;
+        settled = true;
+        clearTimeout(timer);
+        resolve(value);
+      };
+      const timer = setTimeout(() => finish(null), 800);
+      try {
+        const absolute = new URL(src, location.href);
+        if (absolute.origin !== location.origin && absolute.protocol !== 'data:' && absolute.protocol !== 'blob:') {
+          img.crossOrigin = 'anonymous';
+        }
+      } catch {
+        // Let the browser resolve unusual URLs itself.
+      }
+      img.onload = () => finish(img);
+      img.onerror = () => finish(null);
+      img.src = src;
+    });
+    visualContrastImageCache.set(src, promise);
+    return promise;
+  }
+
+  function sampleDrawablePixel(drawable, sourcePoint) {
+    if (visualContrastRasterCache.has(drawable)) {
+      const cached = visualContrastRasterCache.get(drawable);
+      if (!cached || !cached.ctx) return { status: 'unresolved', reason: cached?.reason || 'image sample failed' };
+      try {
+        const x = Math.max(0, Math.min(cached.width - 1, Math.floor(sourcePoint.x * cached.scaleX)));
+        const y = Math.max(0, Math.min(cached.height - 1, Math.floor(sourcePoint.y * cached.scaleY)));
+        const data = cached.ctx.getImageData(x, y, 1, 1).data;
+        return {
+          status: 'sampled',
+          color: { r: data[0], g: data[1], b: data[2], a: data[3] / 255 },
+        };
+      } catch (err) {
+        return {
+          status: 'unresolved',
+          reason: /taint|cross-origin|Security/i.test(err?.message || '') ? 'tainted image' : 'image sample failed',
+        };
+      }
+    }
+
+    const canvas = document.createElement('canvas');
+    const intrinsicWidth = drawable.naturalWidth || drawable.videoWidth || drawable.width || 1;
+    const intrinsicHeight = drawable.naturalHeight || drawable.videoHeight || drawable.height || 1;
+    const maxRasterSide = 640;
+    const scale = Math.min(1, maxRasterSide / Math.max(intrinsicWidth, intrinsicHeight));
+    canvas.width = Math.max(1, Math.round(intrinsicWidth * scale));
+    canvas.height = Math.max(1, Math.round(intrinsicHeight * scale));
+    const ctx = canvas.getContext('2d', { willReadFrequently: true });
+    if (!ctx) return { status: 'unresolved', reason: 'canvas unavailable' };
+    try {
+      ctx.drawImage(drawable, 0, 0, canvas.width, canvas.height);
+      const cached = {
+        ctx,
+        width: canvas.width,
+        height: canvas.height,
+        scaleX: canvas.width / intrinsicWidth,
+        scaleY: canvas.height / intrinsicHeight,
+      };
+      visualContrastRasterCache.set(drawable, cached);
+      const x = Math.max(0, Math.min(cached.width - 1, Math.floor(sourcePoint.x * cached.scaleX)));
+      const y = Math.max(0, Math.min(cached.height - 1, Math.floor(sourcePoint.y * cached.scaleY)));
+      const data = ctx.getImageData(x, y, 1, 1).data;
+      return {
+        status: 'sampled',
+        color: { r: data[0], g: data[1], b: data[2], a: data[3] / 255 },
+      };
+    } catch (err) {
+      const reason = /taint|cross-origin|Security/i.test(err?.message || '') ? 'tainted image' : 'image sample failed';
+      visualContrastRasterCache.set(drawable, { ctx: null, reason });
+      return {
+        status: 'unresolved',
+        reason,
+      };
+    }
+  }
+
+  async function sampleCssBackground(el, style, point, textColor) {
+    const rect = el.getBoundingClientRect();
+    const bgImage = style.backgroundImage || '';
+    if (bgImage && bgImage !== 'none') {
+      if (/gradient/i.test(bgImage)) {
+        const color = pickWorstContrastColor(textColor, parseGradientColors(bgImage));
+        if (color) return { status: 'sampled', color, method: 'analytic-gradient' };
+      }
+      if (/url\s*\(/i.test(bgImage)) {
+        const img = await loadVisualContrastImage(firstCssUrl(bgImage));
+        if (!img) return { status: 'unresolved', reason: 'image unavailable' };
+        const paintedRect = resolvePaintedImageRect(
+          rect,
+          img,
+          getLayerValue(style.backgroundSize) || 'auto',
+          getLayerValue(style.backgroundPosition) || '50% 50%',
+        );
+        const sourcePoint = pointToImageSource(point, paintedRect);
+        if (!sourcePoint) return { status: 'unresolved', reason: 'point outside background image' };
+        const sample = sampleDrawablePixel(img, sourcePoint);
+        if (sample.status === 'sampled') return { ...sample, method: 'canvas-background-image' };
+        return sample;
+      }
+    }
+    const bg = parseRgb(style.backgroundColor);
+    if (bg && bg.a > 0.05) return { status: 'sampled', color: bg, method: 'solid-background' };
+    return { status: 'unresolved', reason: 'no readable background' };
+  }
+
+  async function sampleImageElement(img, point) {
+    const rect = img.getBoundingClientRect();
+    const style = getComputedStyle(img);
+    const paintedRect = resolveObjectImageRect(rect, img, style);
+    const sourcePoint = pointToImageSource(point, paintedRect);
+    if (!sourcePoint) return { status: 'unresolved', reason: 'point outside image' };
+    const sample = sampleDrawablePixel(img, sourcePoint);
+    if (sample.status === 'sampled') return { ...sample, method: 'canvas-img-underlay' };
+
+    if (img.currentSrc || img.src) {
+      const loaded = await loadVisualContrastImage(img.currentSrc || img.src);
+      if (loaded) {
+        const loadedRect = { ...paintedRect, intrinsicWidth: loaded.naturalWidth || loaded.width || paintedRect.intrinsicWidth, intrinsicHeight: loaded.naturalHeight || loaded.height || paintedRect.intrinsicHeight };
+        const loadedPoint = pointToImageSource(point, loadedRect);
+        if (loadedPoint) {
+          const loadedSample = sampleDrawablePixel(loaded, loadedPoint);
+          if (loadedSample.status === 'sampled') return { ...loadedSample, method: 'canvas-img-underlay' };
+        }
+      }
+    }
+    return sample;
+  }
+
+  function textSamplePoints(rect) {
+    const insetX = Math.min(12, Math.max(1, rect.width * 0.12));
+    const insetY = Math.min(8, Math.max(1, rect.height * 0.22));
+    const xs = rect.width < 28
+      ? [rect.left + rect.width / 2]
+      : [rect.left + insetX, rect.left + rect.width / 2, rect.right - insetX];
+    const ys = rect.height < 22
+      ? [rect.top + rect.height / 2]
+      : [rect.top + insetY, rect.top + rect.height / 2, rect.bottom - insetY];
+    const points = [];
+    for (const y of ys) {
+      for (const x of xs) {
+        if (x >= 0 && y >= 0 && x <= window.innerWidth && y <= window.innerHeight) points.push({ x, y });
+      }
+    }
+    return points;
+  }
+
+  async function sampleVisualBackgroundAtPoint(el, point, textColor, depth = 0) {
+    if (depth > 8) {
+      return { status: 'unresolved', reason: 'background stack too deep' };
+    }
+    const stack = typeof document.elementsFromPoint === 'function'
+      ? document.elementsFromPoint(point.x, point.y)
+      : [];
+    const selfIndex = stack.findIndex(node => node === el || el.contains(node));
+    const nodes = selfIndex >= 0 ? stack.slice(selfIndex) : [el, ...stack];
+    const unresolved = [];
+
+    for (const node of nodes) {
+      if (!node || node.nodeType !== 1) continue;
+      if (node.closest?.('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
+      const tag = node.tagName?.toLowerCase();
+      if (tag === 'img') {
+        const sample = await sampleImageElement(node, point);
+        if (sample.status === 'sampled') return sample;
+        unresolved.push(sample.reason);
+        continue;
+      }
+      if (tag === 'canvas' || tag === 'video') {
+        const rect = node.getBoundingClientRect();
+        const sourcePoint = pointToImageSource(point, {
+          left: rect.left,
+          top: rect.top,
+          width: rect.width,
+          height: rect.height,
+          intrinsicWidth: node.width || node.videoWidth || rect.width,
+          intrinsicHeight: node.height || node.videoHeight || rect.height,
+        });
+        if (sourcePoint) {
+          const sample = sampleDrawablePixel(node, sourcePoint);
+          if (sample.status === 'sampled') return { ...sample, method: `canvas-${tag}-underlay` };
+          unresolved.push(sample.reason);
+        }
+        continue;
+      }
+      const style = getComputedStyle(node);
+      const sample = await sampleCssBackground(node, style, point, textColor);
+      if (sample.status === 'sampled') {
+        if (!sample.color || sample.color.a == null || sample.color.a >= 0.95) return sample;
+        const under = await sampleVisualBackgroundAtPoint(node.parentElement || document.body, point, textColor, depth + 1);
+        if (under.status === 'sampled') {
+          return {
+            status: 'sampled',
+            color: blendRgba(sample.color, under.color),
+            method: `${sample.method}+alpha`,
+          };
+        }
+        return sample;
+      }
+      unresolved.push(sample.reason);
+    }
+
+    return {
+      status: 'unresolved',
+      reason: [...new Set(unresolved.filter(Boolean))].slice(0, 3).join(', ') || 'no readable visual background',
+    };
+  }
+
+  async function analyzeVisualContrastCandidate(candidate) {
+    let el;
+    try {
+      el = document.querySelector(candidate.selector);
+    } catch {
+      return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'stale selector' };
+    }
+    if (!el) return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'missing element' };
+    if (!isRenderedForBrowserRule(el)) return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'hidden element' };
+
+    const blockingReason = (candidate.reasons || []).find(reason =>
+      reason === 'background-clip text' ||
+      reason === 'blend mode' ||
+      reason === 'filter' ||
+      reason === 'backdrop filter' ||
+      reason === 'opacity stack' ||
+      reason === 'text shadow'
+    );
+    if (blockingReason) {
+      return { ...candidate, status: 'unresolved', confidence: 'none', reason: `${blockingReason} needs screenshot pixels` };
+    }
+
+    const style = getComputedStyle(el);
+    const textColor = parseRgb(style.color) || candidate.textColor;
+    if (!textColor) return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'unreadable text color' };
+
+    const rect = getDirectTextRect(el) || el.getBoundingClientRect();
+    if (!rect || rect.width < 4 || rect.height < 4) {
+      return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'missing text rect' };
+    }
+
+    const points = textSamplePoints(rect);
+    if (points.length === 0) {
+      return { ...candidate, status: 'unresolved', confidence: 'none', reason: 'text outside viewport' };
+    }
+
+    const ratios = [];
+    const methods = new Set();
+    const unresolved = [];
+    for (const point of points) {
+      const sample = await sampleVisualBackgroundAtPoint(el, point, textColor);
+      if (sample.status !== 'sampled' || !sample.color) {
+        unresolved.push(sample.reason);
+        continue;
+      }
+      const fg = blendRgba(textColor, sample.color);
+      ratios.push(contrastRatio(fg, sample.color));
+      if (sample.method) methods.add(sample.method);
+    }
+
+    if (ratios.length < Math.min(3, points.length)) {
+      return {
+        ...candidate,
+        status: 'unresolved',
+        confidence: 'none',
+        samples: ratios.length,
+        reason: [...new Set(unresolved.filter(Boolean))].slice(0, 3).join(', ') || 'not enough readable samples',
+      };
+    }
+
+    ratios.sort((a, b) => a - b);
+    const pick = pct => ratios[Math.min(ratios.length - 1, Math.max(0, Math.floor((pct / 100) * ratios.length)))];
+    const measuredRatio = pick(10);
+    const medianRatio = pick(50);
+    const status = measuredRatio < candidate.threshold ? 'fail' : 'pass';
+    const method = [...methods].sort().join(', ') || 'browser-visual';
+    const textLabel = candidate.text ? ` "${candidate.text}"` : '';
+    const detail = `browser contrast ${measuredRatio.toFixed(1)}:1 median ${medianRatio.toFixed(1)}:1 (need ${candidate.threshold}:1) via ${method}${textLabel}`;
+    return {
+      ...candidate,
+      status,
+      confidence: method.includes('canvas-') ? 'high' : 'medium',
+      method,
+      ratio: measuredRatio,
+      medianRatio,
+      samples: ratios.length,
+      finding: status === 'fail' ? { id: 'low-contrast', snippet: detail } : null,
+    };
+  }
+
+  function waitForVisualPaint() {
+    return new Promise(resolve => {
+      requestAnimationFrame(() => requestAnimationFrame(resolve));
+    });
+  }
+
+  async function analyzeVisualContrast(options = {}) {
+    const candidates = collectVisualContrastCandidates(options);
+    const results = [];
+    const shouldScrollOffscreen = options.scrollOffscreen === true;
+    const restoreScroll = { x: window.scrollX, y: window.scrollY };
+    for (const candidate of candidates) {
+      if (shouldScrollOffscreen && (window.scrollX !== restoreScroll.x || window.scrollY !== restoreScroll.y)) {
+        window.scrollTo(restoreScroll.x, restoreScroll.y);
+        await waitForVisualPaint();
+      }
+      let result = await analyzeVisualContrastCandidate(candidate);
+      if (shouldScrollOffscreen && result.status === 'unresolved' && result.reason === 'text outside viewport') {
+        let el = null;
+        try {
+          el = document.querySelector(candidate.selector);
+        } catch {
+          el = null;
+        }
+        if (el && typeof el.scrollIntoView === 'function') {
+          el.scrollIntoView({ block: 'center', inline: 'nearest', behavior: 'instant' });
+          await waitForVisualPaint();
+          result = await analyzeVisualContrastCandidate(candidate);
+        }
+      }
+      results.push(result);
+    }
+    if (shouldScrollOffscreen && (window.scrollX !== restoreScroll.x || window.scrollY !== restoreScroll.y)) {
+      window.scrollTo(restoreScroll.x, restoreScroll.y);
+    }
+    return results;
+  }
+
+  function isElementHidden(el) {
+    if (!el || el === document.body || el === document.documentElement) return false;
+    if (typeof el.checkVisibility === 'function') return !el.checkVisibility({ checkOpacity: false, checkVisibilityCSS: true });
+    // Fallback: zero size or no offsetParent (covers display:none and detached subtrees)
+    return el.offsetWidth === 0 && el.offsetHeight === 0;
+  }
+
+  function serializeFindings(allFindings) {
+    return allFindings.map(({ el, findings }) => ({
+      selector: generateSelector(el),
+      tagName: el.tagName?.toLowerCase() || 'unknown',
+      rect: (el !== document.body && el !== document.documentElement && el.getBoundingClientRect)
+        ? el.getBoundingClientRect().toJSON() : null,
+      isPageLevel: el === document.body || el === document.documentElement,
+      isHidden: isElementHidden(el),
+      findings: findings.map(f => {
+        const ap = ANTIPATTERNS.find(a => a.id === (f.type || f.id));
+        return {
+          type: f.type || f.id,
+          category: ap ? ap.category : 'quality',
+          severity: ap?.severity || 'warning',
+          detail: f.detail || f.snippet,
+          ignoreValue: f.ignoreValue || f.value || '',
+          name: ap ? ap.name : (f.type || f.id),
+          description: ap ? ap.description : '',
+        };
+      }),
+    }));
+  }
+
+  const printSummary = function(allFindings) {
+    if (allFindings.length === 0) {
+      console.log('%c[impeccable] No anti-patterns found.', 'color: #22c55e; font-weight: bold');
+      return;
+    }
+    console.group(
+      `%c[impeccable] ${allFindings.length} anti-pattern${allFindings.length === 1 ? '' : 's'} found`,
+      'color: oklch(84% 0.19 80.46); font-weight: bold'
+    );
+    for (const { el, findings } of allFindings) {
+      for (const f of findings) {
+        console.log(`%c${f.type || f.id}%c ${f.detail || f.snippet}`,
+          'color: oklch(84% 0.19 80.46); font-weight: bold', 'color: inherit', el);
+      }
+    }
+    console.groupEnd();
+  };
+
+  function addBrowserFindings(groupMap, el, findings) {
+    if (!findings || findings.length === 0) return;
+    const existing = groupMap.get(el);
+    if (existing) existing.push(...findings);
+    else groupMap.set(el, [...findings]);
+  }
+
+  function browserFindingsFromMap(groupMap) {
+    return [...groupMap.entries()].map(([el, findings]) => ({ el, findings }));
+  }
+
+  const DESIGN_COLOR_TOLERANCE = 6;
+  const DESIGN_RADIUS_TOLERANCE_PX = 0.5;
+  const DESIGN_SKIP_TAGS = new Set(['head', 'title', 'meta', 'link', 'style', 'script', 'noscript', 'template', 'source']);
+
+  function normalizeBrowserFontName(value) {
+    return String(value || '')
+      .trim()
+      .replace(/^["']|["']$/g, '')
+      .replace(/\+/g, ' ')
+      .replace(/\s+/g, ' ')
+      .toLowerCase();
+  }
+
+  function browserPrimaryFont(stack) {
+    if (!stack || /var\(/i.test(stack)) return '';
+    return String(stack || '')
+      .split(',')
+      .map(normalizeBrowserFontName)
+      .find(font => font && !GENERIC_FONTS.has(font)) || '';
+  }
+
+  function browserDesignSystemConfig() {
+    const raw = window.__IMPECCABLE_CONFIG__?.designSystem;
+    if (!raw?.present) return null;
+    const allowedFonts = new Set((raw.allowedFonts || []).map(normalizeBrowserFontName).filter(Boolean));
+    const allowedColors = (raw.allowedColors || [])
+      .filter(color => color && Number.isFinite(color.r) && Number.isFinite(color.g) && Number.isFinite(color.b))
+      .map(color => ({ r: color.r, g: color.g, b: color.b }));
+    const allowedRadii = (raw.allowedRadii || [])
+      .map(Number)
+      .filter(px => Number.isFinite(px));
+    return {
+      present: true,
+      hasFonts: raw.hasFonts === true && allowedFonts.size > 0,
+      allowedFonts,
+      hasColors: raw.hasColors === true && allowedColors.length > 0,
+      allowedColors,
+      hasRadii: raw.hasRadii === true && allowedRadii.length > 0,
+      allowedRadii,
+      hasPillRadius: raw.hasPillRadius === true,
+    };
+  }
+
+  function browserColorsClose(a, b) {
+    if (!a || !b) return false;
+    return Math.max(
+      Math.abs(a.r - b.r),
+      Math.abs(a.g - b.g),
+      Math.abs(a.b - b.b),
+    ) <= DESIGN_COLOR_TOLERANCE;
+  }
+
+  function isBrowserDesignColorAllowed(raw, designSystem) {
+    if (!designSystem?.hasColors) return true;
+    const text = String(raw || '').trim().toLowerCase();
+    if (!text || text === 'transparent' || text === 'currentcolor' || text === 'inherit' || text === 'initial') return true;
+    if (text.includes('var(')) return true;
+    const parsed = parseAnyColor(text);
+    if (!parsed) return true;
+    if ((parsed.a ?? 1) <= 0.05) return true;
+    return designSystem.allowedColors.some(color => browserColorsClose(parsed, color));
+  }
+
+  function isBrowserTransparentCss(value) {
+    const text = String(value || '').trim().toLowerCase();
+    if (!text || text === 'transparent') return true;
+    const parsed = parseAnyColor(text);
+    return parsed ? (parsed.a ?? 1) <= 0.05 : false;
+  }
+
+  function isBrowserDesignRadiusAllowed(raw, designSystem) {
+    if (!designSystem?.hasRadii) return true;
+    const text = String(raw || '').trim().toLowerCase();
+    if (!text || text === '0' || text === 'none' || text === 'initial' || text === 'inherit') return true;
+    if (text.includes('var(') || text.includes('%')) return true;
+    const px = resolveLengthPx(text, 16);
+    if (px == null || !Number.isFinite(px) || px <= DESIGN_RADIUS_TOLERANCE_PX) return true;
+    if (designSystem.hasPillRadius && px >= 99) return true;
+    return designSystem.allowedRadii.some(allowed => Math.abs(allowed - px) <= DESIGN_RADIUS_TOLERANCE_PX);
+  }
+
+  function browserRadiusTokens(value) {
+    return String(value || '')
+      .replace(/\s*\/\s*/g, ' ')
+      .split(/\s+/)
+      .map(token => token.trim())
+      .filter(Boolean);
+  }
+
+  function browserHasDirectText(el) {
+    return [...(el.childNodes || [])].some(node => node.nodeType === 3 && node.textContent.trim().length > 0);
+  }
+
+  function browserSampleText(el) {
+    const text = String(el.textContent || '').replace(/\s+/g, ' ').trim();
+    return text ? ` "${text.slice(0, 40)}"` : '';
+  }
+
+  function shouldSkipDesignElement(el) {
+    const tag = el.tagName?.toLowerCase?.() || '';
+    return DESIGN_SKIP_TAGS.has(tag) || isElementHidden(el);
+  }
+
+  function checkElementDesignSystemDOM(el, designSystem, seen) {
+    if (!designSystem?.present || shouldSkipDesignElement(el)) return [];
+    const findings = [];
+    const tag = el.tagName?.toLowerCase?.() || 'unknown';
+    const style = getComputedStyle(el);
+
+    if (designSystem.hasFonts && browserHasDirectText(el)) {
+      const font = browserPrimaryFont(style.fontFamily || '');
+      if (font && !designSystem.allowedFonts.has(font) && !seen.fonts.has(font)) {
+        seen.fonts.add(font);
+        findings.push({
+          type: 'design-system-font',
+          detail: `${tag}${browserSampleText(el)} uses ${font}; not declared in DESIGN.md typography`,
+          ignoreValue: font,
+        });
+      }
+    }
+
+    if (designSystem.hasColors) {
+      const colorChecks = [];
+      if (browserHasDirectText(el)) colorChecks.push(['text color', style.color]);
+      if (!isBrowserTransparentCss(style.backgroundColor)) colorChecks.push(['background', style.backgroundColor]);
+      for (const side of ['Top', 'Right', 'Bottom', 'Left']) {
+        if ((parseFloat(style[`border${side}Width`]) || 0) > 0) {
+          colorChecks.push([`border-${side.toLowerCase()}`, style[`border${side}Color`]]);
+        }
+      }
+      if ((parseFloat(style.outlineWidth) || 0) > 0) colorChecks.push(['outline', style.outlineColor]);
+
+      for (const [kind, raw] of colorChecks) {
+        const label = String(raw || '').trim().replace(/\s+/g, ' ');
+        if (isBrowserDesignColorAllowed(label, designSystem)) continue;
+        const key = `${kind}:${label}`;
+        if (seen.colors.has(key)) continue;
+        seen.colors.add(key);
+        findings.push({
+          type: 'design-system-color',
+          detail: `${kind} ${label} on ${tag}${browserSampleText(el)} is outside DESIGN.md colors`,
+          ignoreValue: label,
+        });
+      }
+    }
+
+    if (designSystem.hasRadii) {
+      for (const token of browserRadiusTokens(style.borderRadius || '')) {
+        if (isBrowserDesignRadiusAllowed(token, designSystem)) continue;
+        if (seen.radii.has(token)) continue;
+        seen.radii.add(token);
+        findings.push({
+          type: 'design-system-radius',
+          detail: `border-radius ${token} on ${tag}${browserSampleText(el)} is outside the DESIGN.md rounded scale`,
+          ignoreValue: token,
+        });
+      }
+    }
+
+    return findings;
+  }
+
+  function decodeBrowserGoogleFamily(value) {
+    const family = String(value || '').split(':')[0].replace(/\+/g, ' ');
+    try {
+      return decodeURIComponent(family);
+    } catch {
+      return family;
+    }
+  }
+
+  function checkBrowserDesignSystemSources(designSystem, seen) {
+    if (!designSystem?.hasFonts) return [];
+    const findings = [];
+    for (const link of document.querySelectorAll('link[href*="fonts.googleapis.com/css"]')) {
+      const href = link.getAttribute('href') || '';
+      for (const match of href.matchAll(/[?&]family=([^&]+)/g)) {
+        const display = decodeBrowserGoogleFamily(match[1]);
+        const font = normalizeBrowserFontName(display);
+        if (!font || designSystem.allowedFonts.has(font) || seen.fonts.has(font)) continue;
+        seen.fonts.add(font);
+        findings.push({
+          type: 'design-system-font',
+          detail: `Google Fonts: ${display} is not declared in DESIGN.md typography`,
+          ignoreValue: display,
+        });
+      }
+    }
+    return findings;
+  }
+
+  function collectBrowserFindings() {
+    const groupMap = new Map();
+    const _disabled = EXTENSION_MODE ? (window.__IMPECCABLE_CONFIG__?.disabledRules || []) : [];
+    const _ruleOk = (id) => !_disabled.length || !_disabled.includes(id);
+    const designSystem = browserDesignSystemConfig();
+    const designSeen = { fonts: new Set(), colors: new Set(), radii: new Set() };
+    // Note: provider-gated rules (--gpt / --gemini) are NOT filtered here. In a
+    // real browser env (detector page, live overlay, extension) running every
+    // check is free, so we always surface them; the gating is purely a CLI
+    // output concern, applied in the Node engines' detect* return paths.
+
+    for (const el of document.querySelectorAll('*')) {
+      // Skip impeccable's own elements and any descendants (overlays, labels, banner, nav buttons)
+      if (el.closest('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
+      // Skip browser extension elements (Claude, etc.)
+      const elId = el.id || '';
+      if (elId.startsWith('claude-') || elId.startsWith('cic-')) continue;
+      // Skip the impeccable live-mode overlay (highlight, tooltip, bar, picker, toast).
+      // These are inspector chrome, not part of the user's design.
+      if (el.closest('[id^="impeccable-live-"]')) continue;
+      // Skip html/body -- page-level findings go in the banner, not a full-page overlay
+      if (el === document.body || el === document.documentElement) continue;
+
+      const findings = [
+        ...checkElementBordersDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementColorsDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementMotionDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementGlowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementAIPaletteDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementIconTileDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementItalicSerifDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementQualityDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementOversizedH1DOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementClippedOverflowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementGptBorderShadowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementTextOverflowDOM(el).map(f => ({ type: f.id, detail: f.snippet })),
+        ...checkElementDesignSystemDOM(el, designSystem, designSeen),
+      ].filter(f => _ruleOk(f.type));
+
+      addBrowserFindings(groupMap, el, findings);
+
+      // Hero eyebrow: the offending element is the eyebrow above the heading,
+      // not the heading itself — highlight the previous sibling instead.
+      const eyebrowFindings = checkElementHeroEyebrowDOM(el)
+        .map(f => ({ type: f.id, detail: f.snippet }))
+        .filter(f => _ruleOk(f.type));
+      if (eyebrowFindings.length > 0 && el.previousElementSibling) {
+        addBrowserFindings(groupMap, el.previousElementSibling, eyebrowFindings);
+      }
+    }
+
+    const pageLevelFindings = [];
+
+    const designSourceFindings = checkBrowserDesignSystemSources(designSystem, designSeen)
+      .filter(f => _ruleOk(f.type));
+    if (designSourceFindings.length > 0) {
+      pageLevelFindings.push(...designSourceFindings);
+      addBrowserFindings(groupMap, document.body, designSourceFindings);
+    }
+
+    const typoFindings = checkTypography().filter(f => _ruleOk(f.type));
+    if (typoFindings.length > 0) {
+      pageLevelFindings.push(...typoFindings);
+      addBrowserFindings(groupMap, document.body, typoFindings);
+    }
+
+    const sectionKickerFindings = checkRepeatedSectionKickersDOM()
+      .map(f => ({ type: f.id, detail: f.snippet }))
+      .filter(f => _ruleOk(f.type));
+    if (sectionKickerFindings.length > 0) {
+      pageLevelFindings.push(...sectionKickerFindings);
+      addBrowserFindings(groupMap, document.body, sectionKickerFindings);
+    }
+
+    const layoutFindings = checkLayout().filter(f => _ruleOk(f.type));
+    for (const f of layoutFindings) {
+      const el = f.el || document.body;
+      addBrowserFindings(groupMap, el, [{ type: f.type, detail: f.detail || f.snippet }]);
+    }
+
+    // Page-level quality checks (headings, etc.)
+    const qualityFindings = checkPageQualityDOM().filter(f => _ruleOk(f.type));
+    if (qualityFindings.length > 0) {
+      pageLevelFindings.push(...qualityFindings);
+      addBrowserFindings(groupMap, document.body, qualityFindings);
+    }
+
+    const creamFindings = checkCreamPalette(document)
+      .map(f => ({ type: f.id, detail: f.snippet }))
+      .filter(f => _ruleOk(f.type));
+    if (creamFindings.length > 0) {
+      pageLevelFindings.push(...creamFindings);
+      addBrowserFindings(groupMap, document.body, creamFindings);
+    }
+
+    // Regex-on-HTML checks (shared with Node)
+    // Clone the document and strip impeccable-live overlay nodes before the
+    // regex scan, so the inspector's own inline styles (transitions on top/
+    // left/width/height, etc.) don't register as page anti-patterns.
+    const docClone = document.documentElement.cloneNode(true);
+    for (const node of docClone.querySelectorAll('[id^="impeccable-live-"]')) {
+      node.remove();
+    }
+    const htmlPatternFindings = checkHtmlPatterns(docClone.outerHTML);
+    if (htmlPatternFindings.length > 0) {
+      const mapped = htmlPatternFindings.map(f => ({ type: f.id, detail: f.snippet })).filter(f => _ruleOk(f.type));
+      pageLevelFindings.push(...mapped);
+      addBrowserFindings(groupMap, document.body, mapped);
+    }
+
+    return {
+      groupMap,
+      allFindings: browserFindingsFromMap(groupMap),
+      pageLevelFindings,
+    };
+  }
+
+  function shouldRunVisualContrast(options = {}) {
+    return options.visualContrast === true || window.__IMPECCABLE_CONFIG__?.visualContrast === true;
+  }
+
+  function visualContrastOptions(options = {}) {
+    const config = window.__IMPECCABLE_CONFIG__ || {};
+    const scrollOffscreen = typeof options.scrollOffscreen === 'boolean'
+      ? options.scrollOffscreen
+      : typeof options.visualContrastScrollOffscreen === 'boolean'
+        ? options.visualContrastScrollOffscreen
+        : typeof config.visualContrastScrollOffscreen === 'boolean'
+          ? config.visualContrastScrollOffscreen
+          : false;
+    return {
+      ...options,
+      maxCandidates: Number.isFinite(options.visualContrastMaxCandidates)
+        ? options.visualContrastMaxCandidates
+        : Number.isFinite(options.maxCandidates)
+          ? options.maxCandidates
+          : Number.isFinite(config.visualContrastMaxCandidates)
+            ? config.visualContrastMaxCandidates
+            : undefined,
+      scrollOffscreen,
+    };
+  }
+
+  let lastVisualContrastAnalyses = [];
+  let lazyVisualContrastObserver = null;
+  let lazyVisualContrastPending = new WeakMap();
+  const lazyVisualContrastResolving = new WeakSet();
+  let scanGeneration = 0;
+
+  function rememberVisualContrastAnalysis(result) {
+    if (!result?.selector) {
+      lastVisualContrastAnalyses.push(result);
+      return;
+    }
+    const idx = lastVisualContrastAnalyses.findIndex(item => item.selector === result.selector);
+    if (idx >= 0) lastVisualContrastAnalyses[idx] = result;
+    else lastVisualContrastAnalyses.push(result);
+  }
+
+  function disconnectLazyVisualContrastObserver() {
+    if (lazyVisualContrastObserver) {
+      lazyVisualContrastObserver.disconnect();
+      lazyVisualContrastObserver = null;
+    }
+    lazyVisualContrastPending = new WeakMap();
+  }
+
+  function addVisualContrastResult(groupMap, result, options = {}) {
+    if (result.status !== 'fail' || !result.finding || !result.selector) return false;
+    let el = null;
+    try {
+      el = document.querySelector(result.selector);
+    } catch {
+      el = null;
+    }
+    if (!el) return false;
+    const findingType = result.finding.type || result.finding.id || 'low-contrast';
+    const existing = groupMap.get(el) || [];
+    if (existing.some(f => (f.type || f.id) === findingType)) return false;
+    addBrowserFindings(groupMap, el, [{
+      type: findingType,
+      detail: result.finding.detail || result.finding.snippet,
+    }]);
+    if (options.decorate && el !== document.body && el !== document.documentElement) {
+      highlight(el, groupMap.get(el) || []);
+    }
+    return true;
+  }
+
+  function scanResultMeta(options = {}) {
+    const scanId = options.scanId;
+    if (typeof scanId !== 'string' && typeof scanId !== 'number') return {};
+    return { scanId: String(scanId) };
+  }
+
+  function postSerializedFindings(groupMap, options = {}) {
+    if (!EXTENSION_MODE) return;
+    const allFindings = browserFindingsFromMap(groupMap);
+    window.postMessage({
+      source: 'impeccable-results',
+      findings: serializeFindings(allFindings),
+      count: allFindings.length,
+      ...scanResultMeta(options),
+    }, '*');
+  }
+
+  function postExtensionError(err) {
+    if (!EXTENSION_MODE) return;
+    window.postMessage({
+      source: 'impeccable-error',
+      message: err?.message || String(err),
+    }, '*');
+  }
+
+  function reportVisualContrastError(err, detail = {}) {
+    window.dispatchEvent(new CustomEvent('impeccable-visual-contrast-error', {
+      detail: {
+        ...detail,
+        message: err?.message || String(err),
+      },
+    }));
+    if (EXTENSION_MODE) {
+      postExtensionError(err);
+    } else {
+      console.warn('[impeccable] visual contrast scan failed', err);
+    }
+  }
+
+  function scheduleLazyVisualContrast(groupMap, analyses, options = {}, runtime = {}) {
+    disconnectLazyVisualContrastObserver();
+    if (options.visualContrastLazy === false || options.scrollOffscreen !== false) return;
+    if (typeof IntersectionObserver === 'undefined') return;
+    const unresolved = (analyses || []).filter(result =>
+      result?.status === 'unresolved' &&
+      result.reason === 'text outside viewport' &&
+      result.selector
+    );
+    if (unresolved.length === 0) return;
+    const generation = runtime.generation || scanGeneration;
+
+    lazyVisualContrastObserver = new IntersectionObserver((entries) => {
+      for (const entry of entries) {
+        if (!entry.isIntersecting) continue;
+        const el = entry.target;
+        const candidate = lazyVisualContrastPending.get(el);
+        if (!candidate || lazyVisualContrastResolving.has(el)) continue;
+        lazyVisualContrastObserver?.unobserve(el);
+        lazyVisualContrastPending.delete(el);
+        lazyVisualContrastResolving.add(el);
+        waitForVisualPaint()
+          .then(() => analyzeVisualContrastCandidate(candidate))
+          .then(result => {
+            if (generation !== scanGeneration) return;
+            rememberVisualContrastAnalysis(result);
+            const added = addVisualContrastResult(groupMap, result, { decorate: true });
+            if (added) {
+              postSerializedFindings(groupMap, options);
+              window.dispatchEvent(new CustomEvent('impeccable-visual-contrast-resolved', {
+                detail: {
+                  selector: result.selector,
+                  status: result.status,
+                  finding: result.finding || null,
+                },
+              }));
+            }
+          })
+          .catch(err => {
+            reportVisualContrastError(err, { selector: candidate.selector });
+          })
+          .finally(() => {
+            lazyVisualContrastResolving.delete(el);
+          });
+      }
+    }, { threshold: 0.5 });
+
+    for (const candidate of unresolved) {
+      let el = null;
+      try {
+        el = document.querySelector(candidate.selector);
+      } catch {
+        el = null;
+      }
+      if (!el) continue;
+      lazyVisualContrastPending.set(el, candidate);
+      lazyVisualContrastObserver.observe(el);
+    }
+  }
+
+  async function addVisualContrastFindings(groupMap, options = {}, runtime = {}) {
+    if (!shouldRunVisualContrast(options)) {
+      lastVisualContrastAnalyses = [];
+      disconnectLazyVisualContrastObserver();
+      return [];
+    }
+    const resolvedOptions = visualContrastOptions(options);
+    const analyses = await analyzeVisualContrast(resolvedOptions);
+    if (runtime.generation && runtime.generation !== scanGeneration) return analyses;
+    lastVisualContrastAnalyses = analyses;
+    for (const result of analyses) {
+      addVisualContrastResult(groupMap, result, { decorate: runtime.decorate });
+    }
+    if (runtime.decorate || runtime.scheduleLazy) scheduleLazyVisualContrast(groupMap, analyses, resolvedOptions, runtime);
+    return analyses;
+  }
+
+  async function collectBrowserFindingsAsync(options = {}, runtime = {}) {
+    const collected = collectBrowserFindings();
+    await addVisualContrastFindings(collected.groupMap, options, runtime);
+    return {
+      ...collected,
+      allFindings: browserFindingsFromMap(collected.groupMap),
+      visualContrastAnalyses: lastVisualContrastAnalyses,
+    };
+  }
+
+  function clearOverlays() {
+    scanGeneration += 1;
+    disconnectLazyVisualContrastObserver();
+    for (const o of [...overlays]) detachOverlay(o);
+    overlays.length = 0;
+    visibilityObserver.disconnect();
+    overlayIndex = 0;
+  }
+
+  function renderBrowserFindings(collected, options = {}) {
+    const { allFindings, pageLevelFindings } = collected;
+
+    for (const { el, findings } of allFindings) {
+      if (el === document.body || el === document.documentElement) continue;
+      highlight(el, findings);
+    }
+
+    if (pageLevelFindings.length > 0) {
+      showPageBanner(pageLevelFindings);
+    }
+
+    if (!EXTENSION_MODE) printSummary(allFindings);
+
+    // In extension mode, post serialized results for the DevTools panel
+    if (EXTENSION_MODE) {
+      window.postMessage({
+        source: 'impeccable-results',
+        findings: serializeFindings(allFindings),
+        count: allFindings.length,
+        ...scanResultMeta(options),
+      }, '*');
+    }
+
+    // After this scan completes, all subsequent reveals are instant (no stagger, no animation)
+    setTimeout(() => { firstScanDone = true; }, 1000);
+
+    return allFindings;
+  }
+
+  let firstScanDone = false;
+  const scan = function(options = {}) {
+    clearOverlays();
+    const generation = scanGeneration;
+    const collected = collectBrowserFindings();
+    const allFindings = renderBrowserFindings(collected, options);
+    if (shouldRunVisualContrast(options)) {
+      addVisualContrastFindings(collected.groupMap, options, { decorate: true, generation })
+        .then(() => {
+          if (generation === scanGeneration) postSerializedFindings(collected.groupMap, options);
+        })
+        .catch(err => {
+          reportVisualContrastError(err);
+        });
+    }
+    return allFindings;
+  };
+
+  const scanAsync = async function(options = {}) {
+    clearOverlays();
+    const generation = scanGeneration;
+    if (shouldRunVisualContrast(options)) {
+      const collected = await collectBrowserFindingsAsync(options, { generation, scheduleLazy: true });
+      if (generation !== scanGeneration) return [];
+      return renderBrowserFindings(collected, options);
+    }
+    lastVisualContrastAnalyses = [];
+    return renderBrowserFindings(collectBrowserFindings(), options);
+  };
+
+  const detect = function(options = {}) {
+    lastVisualContrastAnalyses = [];
+    const { allFindings } = collectBrowserFindings();
+    return options.serialize === false ? allFindings : serializeFindings(allFindings);
+  };
+
+  const detectAsync = async function(options = {}) {
+    if (shouldRunVisualContrast(options)) {
+      const { allFindings } = await collectBrowserFindingsAsync(options);
+      return options.serialize === false ? allFindings : serializeFindings(allFindings);
+    }
+    lastVisualContrastAnalyses = [];
+    const { allFindings } = collectBrowserFindings();
+    return options.serialize === false ? allFindings : serializeFindings(allFindings);
+  };
+
+  if (EXTENSION_MODE) {
+    // Extension mode: listen for commands, don't auto-scan
+    window.addEventListener('message', (e) => {
+      if (e.source !== window || !e.data || e.data.source !== 'impeccable-command') return;
+      if (e.data.action === 'scan') {
+        if (e.data.config) window.__IMPECCABLE_CONFIG__ = e.data.config;
+        try {
+          scan(e.data.config || {});
+        } catch (err) {
+          postExtensionError(err);
+        }
+      }
+      if (e.data.action === 'toggle-overlays') {
+        const visible = !document.body.classList.contains('impeccable-hidden');
+        document.body.classList.toggle('impeccable-hidden', visible);
+        window.postMessage({ source: 'impeccable-overlays-toggled', visible: !visible }, '*');
+      }
+      if (e.data.action === 'remove') {
+        clearOverlays();
+        styleEl.remove();
+        if (spotlightBackdrop) { spotlightBackdrop.remove(); spotlightBackdrop = null; }
+        document.body.classList.remove('impeccable-hidden');
+      }
+      if (e.data.action === 'highlight') {
+        try {
+          const target = e.data.selector ? document.querySelector(e.data.selector) : null;
+          if (target) {
+            // Scroll first so positionOverlay reads the post-scroll rect
+            if (!isInViewport(target) && target.scrollIntoView) {
+              target.scrollIntoView({ behavior: 'instant', block: 'center' });
+            }
+            for (const o of overlays) {
+              if (o.classList.contains('impeccable-banner')) continue;
+              const isMatch = o._targetEl === target;
+              o.classList.toggle('impeccable-spotlight', isMatch);
+              o.classList.toggle('impeccable-spotlight-dimmed', !isMatch);
+              if (isMatch) {
+                // Force the matching overlay visible immediately, don't wait for IntersectionObserver
+                o.style.display = '';
+                o.style.animation = 'none';
+                o.classList.add('impeccable-visible');
+                o._revealed = true;
+                positionOverlay(o);
+              }
+            }
+            showSpotlight(target);
+          }
+        } catch { /* invalid selector */ }
+      }
+      if (e.data.action === 'unhighlight') {
+        hideSpotlight();
+        for (const o of overlays) {
+          o.classList.remove('impeccable-spotlight');
+          o.classList.remove('impeccable-spotlight-dimmed');
+        }
+      }
+    });
+    window.postMessage({ source: 'impeccable-ready' }, '*');
+  } else {
+    if (window.__IMPECCABLE_CONFIG__?.autoScan !== false) {
+      const runAutoScan = () => {
+        try {
+          scan();
+        } catch (err) {
+          console.warn('[impeccable] scan failed', err);
+        }
+      };
+      if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', () => setTimeout(runAutoScan, 100));
+      } else {
+        setTimeout(runAutoScan, 100);
+      }
+    }
+  }
+
+  window.impeccableDetect = detect;
+  window.impeccableDetectAsync = detectAsync;
+  window.impeccableScan = scan;
+  window.impeccableScanAsync = scanAsync;
+  window.impeccableCollectVisualContrastCandidates = collectVisualContrastCandidates;
+  window.impeccableAnalyzeVisualContrast = analyzeVisualContrast;
+  window.impeccableGetLastVisualContrastAnalyses = () => lastVisualContrastAnalyses.slice();
+}
+
+})();
diff --git a/tools/design-detector/detector/detect-antipatterns.mjs b/tools/design-detector/detector/detect-antipatterns.mjs
new file mode 100644
index 0000000..c5bcf06
--- /dev/null
+++ b/tools/design-detector/detector/detect-antipatterns.mjs
@@ -0,0 +1,50 @@
+#!/usr/bin/env node
+
+/**
+ * Anti-Pattern Detector for Impeccable
+ * Copyright (c) 2026 Paul Bakaus
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Public API facade. Runtime engines live under cli/engine/engines/.
+ */
+
+import { detectCli } from './cli/main.mjs';
+
+export { ANTIPATTERNS, RULE_ENGINE_SUPPORT, getAntipattern, getRulesForCategory, getRuleEngineSupport } from './registry/antipatterns.mjs';
+export { SAFE_TAGS, BORDER_SAFE_TAGS, OVERUSED_FONTS, GENERIC_FONTS, KNOWN_SERIF_FONTS } from './shared/constants.mjs';
+export { isNeutralColor, parseRgb, relativeLuminance, contrastRatio, parseGradientColors, hasChroma, getHue, colorToHex } from './shared/color.mjs';
+export { isFullPage } from './shared/page.mjs';
+export {
+  checkElementBorders,
+  checkElementMotion,
+  checkElementGlow,
+  checkPageTypography,
+  checkPageLayout,
+  checkHtmlPatterns,
+} from './rules/checks.mjs';
+export { createDetectorProfile, summarizeDetectorProfile } from './profile/profiler.mjs';
+export {
+  parseFrontmatter as parseDesignFrontmatter,
+  normalizeDesignSystem,
+  loadDesignSystemForCwd,
+  checkSourceDesignSystem,
+  collectStaticDesignSystemFindings,
+} from './design-system.mjs';
+export { detectHtml } from './engines/static-html/detect-html.mjs';
+export { detectUrl, createBrowserDetector } from './engines/browser/detect-url.mjs';
+export { detectText, extractStyleBlocks, extractCSSinJS } from './engines/regex/detect-text.mjs';
+export {
+  walkDir,
+  SCANNABLE_EXTENSIONS,
+  SKIP_DIRS,
+  buildImportGraph,
+  resolveImport,
+  detectFrameworkConfig,
+  isPortListening,
+  FRAMEWORK_CONFIGS,
+} from './node/file-system.mjs';
+export { formatFindings, detectCli } from './cli/main.mjs';
+
+const isMainModule = process.argv[1]?.endsWith('detect-antipatterns.mjs') ||
+  process.argv[1]?.endsWith('detect-antipatterns.mjs/');
+if (isMainModule) detectCli();
diff --git a/tools/design-detector/detector/engines/browser/detect-url.mjs b/tools/design-detector/detector/engines/browser/detect-url.mjs
new file mode 100644
index 0000000..9831663
--- /dev/null
+++ b/tools/design-detector/detector/engines/browser/detect-url.mjs
@@ -0,0 +1,277 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { finding } from '../../findings.mjs';
+import { filterByProviders } from '../../registry/antipatterns.mjs';
+import { profileFindingsAsync, profileStep, profileStepAsync } from '../../profile/profiler.mjs';
+import { captureVisualContrastCandidate } from '../visual/screenshot-contrast.mjs';
+
+function serializeDesignSystemForBrowser(designSystem) {
+  if (!designSystem?.present) return null;
+  return {
+    present: true,
+    hasFonts: designSystem.hasFonts === true,
+    allowedFonts: Array.from(designSystem.allowedFonts || []),
+    hasColors: designSystem.hasColors === true,
+    allowedColors: Array.from(designSystem.allowedColorKeys?.values?.() || [])
+      .map(entry => entry?.color)
+      .filter(color => color && Number.isFinite(color.r) && Number.isFinite(color.g) && Number.isFinite(color.b))
+      .map(color => ({ r: color.r, g: color.g, b: color.b })),
+    hasRadii: designSystem.hasRadii === true,
+    allowedRadii: (designSystem.allowedRadii || [])
+      .map(entry => Number(entry?.px))
+      .filter(px => Number.isFinite(px)),
+    hasPillRadius: designSystem.hasPillRadius === true,
+  };
+}
+
+async function runVisualContrastFallback(page, serializedGroups, options, profile, target) {
+  if (options?.visualContrast === false) return [];
+  const maxCandidates = Number.isFinite(options?.visualContrastMaxCandidates)
+    ? options.visualContrastMaxCandidates
+    : 12;
+  const scrollOffscreen = options?.visualContrastScrollOffscreen !== false;
+  const existingLowContrastSelectors = new Set(
+    serializedGroups
+      .filter(group => group.findings?.some(f => f.type === 'low-contrast'))
+      .map(group => group.selector)
+      .filter(Boolean)
+  );
+
+  let browserAnalyses = [];
+  const findings = [];
+  if (options?.visualContrastBrowser !== false) {
+    const browserFindings = await profileFindingsAsync(profile, {
+      engine: 'browser',
+      phase: 'visual-contrast',
+      ruleId: 'browser-fallback',
+      target,
+    }, async () => {
+      browserAnalyses = await page.evaluate(async ({ maxCandidates, scrollOffscreen }) => {
+        if (typeof window.impeccableAnalyzeVisualContrast !== 'function') return [];
+        return window.impeccableAnalyzeVisualContrast({ maxCandidates, scrollOffscreen });
+      }, { maxCandidates, scrollOffscreen });
+      return browserAnalyses
+        .filter(result => result.finding && !existingLowContrastSelectors.has(result.selector))
+        .map(result => result.finding);
+    });
+    findings.push(...browserFindings);
+  }
+
+  let candidates = browserAnalyses.length > 0 ? browserAnalyses : [];
+  if (candidates.length === 0) {
+    candidates = await profileStepAsync(profile, {
+      engine: 'browser',
+      phase: 'visual-contrast',
+      ruleId: 'collect-candidates',
+      target,
+    }, () => page.evaluate(({ maxCandidates }) => {
+      if (typeof window.impeccableCollectVisualContrastCandidates !== 'function') return [];
+      return window.impeccableCollectVisualContrastCandidates({ maxCandidates });
+    }, { maxCandidates }));
+  }
+
+  const viewport = options?.viewport || { width: 1280, height: 800 };
+  const browserResolvedSelectors = new Set(
+    browserAnalyses
+      .filter(result => result.status === 'fail' || result.status === 'pass')
+      .map(result => result.selector)
+      .filter(Boolean)
+  );
+  const filtered = candidates.filter(candidate =>
+    !existingLowContrastSelectors.has(candidate.selector) &&
+    !browserResolvedSelectors.has(candidate.selector)
+  );
+  if (options?.visualContrastPixel === false) return findings;
+  for (const candidate of filtered) {
+    const result = await profileFindingsAsync(profile, {
+      engine: 'browser',
+      phase: 'visual-contrast',
+      ruleId: 'pixel-diff',
+      target,
+    }, async () => {
+      const finding = await captureVisualContrastCandidate(page, candidate, viewport);
+      return finding ? [finding] : [];
+    });
+    findings.push(...result);
+  }
+  return findings;
+}
+
+// ---------------------------------------------------------------------------
+// Puppeteer detection (for URLs)
+// ---------------------------------------------------------------------------
+
+async function detectUrl(url, options = {}) {
+  const profile = options?.profile;
+  const waitUntil = options?.waitUntil || 'networkidle0';
+  const settleMs = Number.isFinite(options?.settleMs) ? options.settleMs : 0;
+  const viewport = options?.viewport || { width: 1280, height: 800 };
+  const externalBrowser = options?.browser || null;
+  let puppeteer;
+  if (!externalBrowser) {
+    try {
+      puppeteer = await profileStepAsync(profile, {
+        engine: 'browser',
+        phase: 'setup',
+        ruleId: 'import-puppeteer',
+        target: url,
+      }, () => import('puppeteer'));
+    } catch {
+      throw new Error('puppeteer is required for URL scanning. Install: npm install puppeteer');
+    }
+  }
+
+  // Read the browser detection script — reuse it instead of reimplementing
+  const browserScriptPath = path.resolve(
+    path.dirname(fileURLToPath(import.meta.url)),
+    '..',
+    '..',
+    'detect-antipatterns-browser.js'
+  );
+  let browserScript;
+  try {
+    browserScript = profileStep(profile, {
+      engine: 'browser',
+      phase: 'setup',
+      ruleId: 'read-browser-script',
+      target: url,
+    }, () => fs.readFileSync(browserScriptPath, 'utf-8'));
+  } catch {
+    throw new Error(`Browser script not found at ${browserScriptPath}`);
+  }
+
+  // CI runners (GitHub Actions Ubuntu) block unprivileged user namespaces, so
+  // Chrome can't initialize its sandbox there. Disable the sandbox only when
+  // running in CI; local users keep the default hardened launch.
+  const launchArgs = process.env.CI ? ['--no-sandbox', '--disable-setuid-sandbox'] : [];
+  const browser = externalBrowser || await profileStepAsync(profile, {
+    engine: 'browser',
+    phase: 'load',
+    ruleId: 'launch-browser',
+    target: url,
+  }, () => puppeteer.default.launch({ headless: true, args: launchArgs }));
+  const page = await profileStepAsync(profile, {
+    engine: 'browser',
+    phase: 'load',
+    ruleId: 'new-page',
+    target: url,
+  }, () => browser.newPage());
+  let results = [];
+  try {
+    await profileStepAsync(profile, {
+      engine: 'browser',
+      phase: 'load',
+      ruleId: 'set-viewport',
+      target: url,
+    }, () => page.setViewport(viewport));
+    await profileStepAsync(profile, {
+      engine: 'browser',
+      phase: 'load',
+      ruleId: `goto:${waitUntil}`,
+      target: url,
+    }, () => page.goto(url, { waitUntil, timeout: 30000 }));
+    if (settleMs > 0) {
+      await profileStepAsync(profile, {
+        engine: 'browser',
+        phase: 'load',
+        ruleId: 'settle',
+        target: url,
+      }, () => new Promise(resolve => setTimeout(resolve, settleMs)));
+    }
+
+    // Inject the browser detection script and collect results
+    const browserDesignSystem = serializeDesignSystemForBrowser(options?.designSystem);
+    await profileStepAsync(profile, {
+      engine: 'browser',
+      phase: 'scan',
+      ruleId: 'configure-pure-detect',
+      target: url,
+    }, () => page.evaluate((designSystem) => {
+      window.__IMPECCABLE_CONFIG__ = {
+        ...(window.__IMPECCABLE_CONFIG__ || {}),
+        autoScan: false,
+        ...(designSystem ? { designSystem } : {}),
+      };
+    }, browserDesignSystem));
+    await profileStepAsync(profile, {
+      engine: 'browser',
+      phase: 'scan',
+      ruleId: 'inject-browser-script',
+      target: url,
+    }, () => page.evaluate(browserScript));
+    let serializedGroups = [];
+    results = await profileFindingsAsync(profile, {
+      engine: 'browser',
+      phase: 'scan',
+      ruleId: 'browser-scan',
+      target: url,
+    }, async () => {
+      serializedGroups = await page.evaluate(() => {
+        if (!window.impeccableDetect) return [];
+        return window.impeccableDetect({ decorate: false, serialize: true });
+      });
+      return serializedGroups.flatMap(({ findings }) =>
+        findings.map(f => ({ id: f.type, snippet: f.detail, ignoreValue: f.ignoreValue || '' }))
+      );
+    });
+    const visualFindings = await runVisualContrastFallback(page, serializedGroups, options, profile, url);
+    results.push(...visualFindings);
+  } finally {
+    await profileStepAsync(profile, {
+      engine: 'browser',
+      phase: 'load',
+      ruleId: 'close-page',
+      target: url,
+    }, () => page.close().catch(() => {}));
+    if (!externalBrowser) {
+      await profileStepAsync(profile, {
+        engine: 'browser',
+        phase: 'load',
+        ruleId: 'close-browser',
+        target: url,
+      }, () => browser.close());
+    }
+  }
+  return filterByProviders(results.map(f => {
+    const item = finding(f.id, url, f.snippet);
+    if (f.ignoreValue) item.ignoreValue = f.ignoreValue;
+    return item;
+  }), options.providers);
+}
+
+async function createBrowserDetector(options = {}) {
+  let puppeteer;
+  try {
+    puppeteer = await import('puppeteer');
+  } catch {
+    throw new Error('puppeteer is required for URL scanning. Install: npm install puppeteer');
+  }
+  const launchArgs = options.launchArgs || (process.env.CI ? ['--no-sandbox', '--disable-setuid-sandbox'] : []);
+  const browser = options.browser || await puppeteer.default.launch({
+    headless: options.headless ?? true,
+    args: launchArgs,
+  });
+  const ownsBrowser = !options.browser;
+  const defaults = {
+    waitUntil: options.waitUntil || 'load',
+    settleMs: Number.isFinite(options.settleMs) ? options.settleMs : 100,
+    viewport: options.viewport || { width: 1280, height: 800 },
+  };
+  return {
+    browser,
+    async detectUrl(url, scanOptions = {}) {
+      return detectUrl(url, {
+        ...defaults,
+        ...scanOptions,
+        browser,
+      });
+    },
+    async close() {
+      if (ownsBrowser) await browser.close().catch(() => {});
+    },
+  };
+}
+
+export { runVisualContrastFallback, detectUrl, createBrowserDetector };
diff --git a/tools/design-detector/detector/engines/regex/detect-text.mjs b/tools/design-detector/detector/engines/regex/detect-text.mjs
new file mode 100644
index 0000000..abbdd7b
--- /dev/null
+++ b/tools/design-detector/detector/engines/regex/detect-text.mjs
@@ -0,0 +1,568 @@
+import { GENERIC_FONTS } from '../../shared/constants.mjs';
+import { isNeutralColor } from '../../shared/color.mjs';
+import { checkSourceDesignSystem } from '../../design-system.mjs';
+import { isFullPage } from '../../shared/page.mjs';
+import { applyInlineIgnores } from '../../shared/inline-ignores.mjs';
+import { finding } from '../../findings.mjs';
+import { filterByProviders } from '../../registry/antipatterns.mjs';
+import { profileFindings, profileStep } from '../../profile/profiler.mjs';
+
+// ---------------------------------------------------------------------------
+// Regex fallback (non-HTML files: CSS, JSX, TSX, etc.)
+// ---------------------------------------------------------------------------
+
+const hasRounded = (line) => /\brounded(?:-\w+)?\b/.test(line);
+const hasBorderRadius = (line) => /border-radius/i.test(line);
+const isSafeElement = (line) => /<(?:blockquote|nav[\s>]|pre[\s>]|code[\s>]|a\s|input[\s>]|span[\s>])/i.test(line);
+
+/** Strip HTML to plain text — drops script/style/comments/tags so
+ *  content-text analyzers don't false-positive on code or CSS. */
+function stripHtmlToText(html) {
+  return html
+    .replace(/<script\b[^>]*>[\s\S]*?<\/script>/gi, ' ')
+    .replace(/<style\b[^>]*>[\s\S]*?<\/style>/gi, ' ')
+    .replace(/<!--[\s\S]*?-->/g, ' ')
+    .replace(/<[^>]+>/g, ' ')
+    .replace(/\s+/g, ' ');
+}
+
+const PAGE_ANALYZER_EXTS = new Set(['.html', '.htm', '.astro', '.vue', '.svelte']);
+
+function extFromFilePath(filePath) {
+  return filePath ? (filePath.match(/\.\w+$/)?.[0] || '').toLowerCase() : '';
+}
+
+function shouldRunPageAnalyzers(content, filePath) {
+  if (!isFullPage(content)) return false;
+  const ext = extFromFilePath(filePath);
+  return !ext || PAGE_ANALYZER_EXTS.has(ext);
+}
+
+function isNeutralBorderColor(str) {
+  const m = str.match(/solid\s+((?:rgba?|hsla?|oklch|oklab|lab|lch|hwb|color)\([^)]*\)|#[0-9a-f]{3,8}\b|[a-z]+)/i);
+  if (!m) return false;
+  const c = m[1].toLowerCase();
+  if (['gray', 'grey', 'silver', 'white', 'black', 'transparent', 'currentcolor'].includes(c)) return true;
+  if (/^(?:rgba?|hsla?|oklch|oklab|lab|lch|hwb)\(/i.test(c)) return isNeutralColor(c);
+  const hex = c.match(/^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/);
+  if (hex) {
+    const [r, g, b] = [parseInt(hex[1], 16), parseInt(hex[2], 16), parseInt(hex[3], 16)];
+    return (Math.max(r, g, b) - Math.min(r, g, b)) < 30;
+  }
+  const shex = c.match(/^#([0-9a-f])([0-9a-f])([0-9a-f])$/);
+  if (shex) {
+    const [r, g, b] = [parseInt(shex[1] + shex[1], 16), parseInt(shex[2] + shex[2], 16), parseInt(shex[3] + shex[3], 16)];
+    return (Math.max(r, g, b) - Math.min(r, g, b)) < 30;
+  }
+  return false;
+}
+
+const REGEX_MATCHERS = [
+  // --- Side-tab ---
+  { id: 'side-tab', regex: /\bborder-[lrse]-(\d+)\b/g,
+    test: (m, line) => { const n = +m[1]; return hasRounded(line) ? n >= 2 : n >= 4; },
+    fmt: (m) => m[0] },
+  { id: 'side-tab', regex: /border-(?:left|right)\s*:\s*(\d+)px\s+solid[^;]*/gi,
+    test: (m, line) => { if (isSafeElement(line)) return false; if (isNeutralBorderColor(m[0])) return false; const n = +m[1]; return hasBorderRadius(line) ? n >= 2 : n >= 3; },
+    fmt: (m) => m[0].replace(/\s*;?\s*$/, '') },
+  { id: 'side-tab', regex: /border-(?:left|right)-width\s*:\s*(\d+)px/gi,
+    test: (m, line) => !isSafeElement(line) && +m[1] >= 3,
+    fmt: (m) => m[0] },
+  { id: 'side-tab', regex: /border-inline-(?:start|end)\s*:\s*(\d+)px\s+solid/gi,
+    test: (m, line) => !isSafeElement(line) && +m[1] >= 3,
+    fmt: (m) => m[0] },
+  { id: 'side-tab', regex: /border-inline-(?:start|end)-width\s*:\s*(\d+)px/gi,
+    test: (m, line) => !isSafeElement(line) && +m[1] >= 3,
+    fmt: (m) => m[0] },
+  { id: 'side-tab', regex: /border(?:Left|Right)\s*[:=]\s*["'`](\d+)px\s+solid/g,
+    test: (m) => +m[1] >= 3,
+    fmt: (m) => m[0] },
+  // --- Border accent on rounded ---
+  { id: 'border-accent-on-rounded', regex: /\bborder-[tb]-(\d+)\b/g,
+    test: (m, line) => hasRounded(line) && +m[1] >= 1,
+    fmt: (m) => m[0] },
+  { id: 'border-accent-on-rounded', regex: /border-(?:top|bottom)\s*:\s*(\d+)px\s+solid/gi,
+    test: (m, line) => +m[1] >= 3 && hasBorderRadius(line),
+    fmt: (m) => m[0] },
+  // --- Overused font ---
+  { id: 'overused-font', regex: /font-family\s*:\s*['"]?(Inter|Roboto|Open Sans|Lato|Montserrat|Arial|Helvetica|Fraunces|Geist Sans|Geist Mono|Geist|Mona Sans|Plus Jakarta Sans|Space Grotesk|Recoleta|Instrument Sans|Instrument Serif)\b/gi,
+    test: () => true,
+    fmt: (m) => m[0] },
+  { id: 'overused-font', regex: /fonts\.googleapis\.com\/css2?\?family=(Inter|Roboto|Open\+Sans|Lato|Montserrat|Fraunces|Plus\+Jakarta\+Sans|Space\+Grotesk|Instrument\+Sans|Instrument\+Serif|Mona\+Sans|Geist)\b/gi,
+    test: () => true,
+    fmt: (m) => `Google Fonts: ${m[1].replace(/\+/g, ' ')}` },
+  // --- Gradient text ---
+  { id: 'gradient-text', regex: /background-clip\s*:\s*text|-webkit-background-clip\s*:\s*text/gi,
+    test: (m, line) => /gradient/i.test(line),
+    fmt: () => 'background-clip: text + gradient' },
+  // --- Gradient text (Tailwind) ---
+  { id: 'gradient-text', regex: /\bbg-clip-text\b/g,
+    test: (m, line) => /\bbg-gradient-to-/i.test(line),
+    fmt: () => 'bg-clip-text + bg-gradient' },
+  // --- Tailwind gray on colored bg ---
+  { id: 'gray-on-color', regex: /\btext-(?:gray|slate|zinc|neutral|stone)-(\d+)\b/g,
+    test: (m, line) => /\bbg-(?:red|orange|amber|yellow|lime|green|emerald|teal|cyan|sky|blue|indigo|violet|purple|fuchsia|pink|rose)-\d+\b/.test(line),
+    fmt: (m, line) => { const bg = line.match(/\bbg-(?:red|orange|amber|yellow|lime|green|emerald|teal|cyan|sky|blue|indigo|violet|purple|fuchsia|pink|rose)-\d+\b/); return `${m[0]} on ${bg?.[0] || '?'}`; } },
+  // --- Tailwind AI palette ---
+  { id: 'ai-color-palette', regex: /\btext-(?:purple|violet|indigo)-(\d+)\b/g,
+    test: (m, line) => /\btext-(?:[2-9]xl|[3-9]xl)\b|<h[1-3]/i.test(line),
+    fmt: (m) => `${m[0]} on heading` },
+  { id: 'ai-color-palette', regex: /\bfrom-(?:purple|violet|indigo)-(\d+)\b/g,
+    test: (m, line) => /\bto-(?:purple|violet|indigo|blue|cyan|pink|fuchsia)-\d+\b/.test(line),
+    fmt: (m) => `${m[0]} gradient` },
+  // --- Bounce/elastic easing ---
+  { id: 'bounce-easing', regex: /\banimate-bounce\b/g,
+    test: () => true,
+    fmt: () => 'animate-bounce (Tailwind)' },
+  { id: 'bounce-easing', regex: /animation(?:-name)?\s*:\s*([^;{}]*(?:bounce|elastic|wobble|jiggle|spring)[^;{}]*)/gi,
+    test: () => true,
+    fmt: (m) => {
+      const token = m[1]
+        .split(/[,\s]+/)
+        .find((part) => /bounce|elastic|wobble|jiggle|spring/i.test(part));
+      return `animation: ${token || m[1].trim()}`;
+    } },
+  { id: 'bounce-easing', regex: /cubic-bezier\(\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*\)/g,
+    test: (m) => {
+      const y1 = parseFloat(m[2]), y2 = parseFloat(m[4]);
+      return y1 < -0.1 || y1 > 1.1 || y2 < -0.1 || y2 > 1.1;
+    },
+    fmt: (m) => `cubic-bezier(${m[1]}, ${m[2]}, ${m[3]}, ${m[4]})` },
+  // --- Layout property transition ---
+  { id: 'layout-transition', regex: /transition\s*:\s*([^;{}]+)/gi,
+    test: (m) => {
+      const val = m[1].toLowerCase();
+      if (/\ball\b/.test(val)) return false;
+      return /\b(?:(?:max|min)-)?(?:width|height)\b|\bpadding\b|\bmargin\b/.test(val);
+    },
+    fmt: (m) => {
+      const found = m[1].match(/\b(?:(?:max|min)-)?(?:width|height)\b|\bpadding(?:-(?:top|right|bottom|left))?\b|\bmargin(?:-(?:top|right|bottom|left))?\b/gi);
+      return `transition: ${found ? found.join(', ') : m[1].trim()}`;
+    } },
+  { id: 'layout-transition', regex: /transition-property\s*:\s*([^;{}]+)/gi,
+    test: (m) => {
+      const val = m[1].toLowerCase();
+      if (/\ball\b/.test(val)) return false;
+      return /\b(?:(?:max|min)-)?(?:width|height)\b|\bpadding\b|\bmargin\b/.test(val);
+    },
+    fmt: (m) => {
+      const found = m[1].match(/\b(?:(?:max|min)-)?(?:width|height)\b|\bpadding(?:-(?:top|right|bottom|left))?\b|\bmargin(?:-(?:top|right|bottom|left))?\b/gi);
+      return `transition-property: ${found ? found.join(', ') : m[1].trim()}`;
+    } },
+  // --- Broken image: src="" or src="#" or src=" " ---
+  { id: 'broken-image', regex: /<img\b[^>]*?\bsrc\s*=\s*(?:""|''|"\s+"|'\s+'|"#"|'#')/gi,
+    test: () => true,
+    fmt: (m) => m[0].slice(0, 100) },
+  // --- Broken image: <img> with no src attribute at all ---
+  { id: 'broken-image', regex: /<img\b(?:(?!\bsrc\s*=)[^>])*>/gi,
+    test: (m) => !/\bsrc\s*=/i.test(m[0]),
+    fmt: (m) => m[0].slice(0, 100) },
+];
+
+const REGEX_ANALYZERS = [
+  // Single font
+  (content, filePath) => {
+    const fontFamilyRe = /font-family\s*:\s*([^;}]+)/gi;
+    const fonts = new Set();
+    let m;
+    while ((m = fontFamilyRe.exec(content)) !== null) {
+      for (const f of m[1].split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase())) {
+        if (f && !GENERIC_FONTS.has(f)) fonts.add(f);
+      }
+    }
+    const gfRe = /fonts\.googleapis\.com\/css2?\?family=([^&"'\s]+)/gi;
+    while ((m = gfRe.exec(content)) !== null) {
+      for (const f of m[1].split('|').map(f => f.split(':')[0].replace(/\+/g, ' ').toLowerCase())) fonts.add(f);
+    }
+    if (fonts.size !== 1 || content.split('\n').length < 20) return [];
+    const name = [...fonts][0];
+    const lines = content.split('\n');
+    let line = 1;
+    for (let i = 0; i < lines.length; i++) { if (lines[i].toLowerCase().includes(name)) { line = i + 1; break; } }
+    return [finding('single-font', filePath, `only font used is ${name}`, line)];
+  },
+  // Flat type hierarchy
+  (content, filePath) => {
+    const sizes = new Set();
+    const REM = 16;
+    let m;
+    const sizeRe = /font-size\s*:\s*([\d.]+)(px|rem|em)\b/gi;
+    while ((m = sizeRe.exec(content)) !== null) {
+      const px = m[2] === 'px' ? +m[1] : +m[1] * REM;
+      if (px > 0 && px < 200) sizes.add(Math.round(px * 10) / 10);
+    }
+    const clampRe = /font-size\s*:\s*clamp\(\s*([\d.]+)(px|rem|em)\s*,\s*[^,]+,\s*([\d.]+)(px|rem|em)\s*\)/gi;
+    while ((m = clampRe.exec(content)) !== null) {
+      sizes.add(Math.round((m[2] === 'px' ? +m[1] : +m[1] * REM) * 10) / 10);
+      sizes.add(Math.round((m[4] === 'px' ? +m[3] : +m[3] * REM) * 10) / 10);
+    }
+    const TW = { 'text-xs': 12, 'text-sm': 14, 'text-base': 16, 'text-lg': 18, 'text-xl': 20, 'text-2xl': 24, 'text-3xl': 30, 'text-4xl': 36, 'text-5xl': 48, 'text-6xl': 60, 'text-7xl': 72, 'text-8xl': 96, 'text-9xl': 128 };
+    for (const [cls, px] of Object.entries(TW)) { if (new RegExp(`\\b${cls}\\b`).test(content)) sizes.add(px); }
+    if (sizes.size < 3) return [];
+    const sorted = [...sizes].sort((a, b) => a - b);
+    const ratio = sorted[sorted.length - 1] / sorted[0];
+    if (ratio >= 2.0) return [];
+    const lines = content.split('\n');
+    let line = 1;
+    for (let i = 0; i < lines.length; i++) { if (/font-size/i.test(lines[i]) || /\btext-(?:xs|sm|base|lg|xl|\d)/i.test(lines[i])) { line = i + 1; break; } }
+    return [finding('flat-type-hierarchy', filePath, `Sizes: ${sorted.map(s => s + 'px').join(', ')} (ratio ${ratio.toFixed(1)}:1)`, line)];
+  },
+  // Monotonous spacing (regex)
+  (content, filePath) => {
+    const vals = [];
+    let m;
+    const pxRe = /(?:padding|margin)(?:-(?:top|right|bottom|left))?\s*:\s*(\d+)px/gi;
+    while ((m = pxRe.exec(content)) !== null) { const v = +m[1]; if (v > 0 && v < 200) vals.push(v); }
+    const remRe = /(?:padding|margin)(?:-(?:top|right|bottom|left))?\s*:\s*([\d.]+)rem/gi;
+    while ((m = remRe.exec(content)) !== null) { const v = Math.round(parseFloat(m[1]) * 16); if (v > 0 && v < 200) vals.push(v); }
+    const gapRe = /gap\s*:\s*(\d+)px/gi;
+    while ((m = gapRe.exec(content)) !== null) vals.push(+m[1]);
+    const twRe = /\b(?:p|px|py|pt|pb|pl|pr|m|mx|my|mt|mb|ml|mr|gap)-(\d+)\b/g;
+    while ((m = twRe.exec(content)) !== null) vals.push(+m[1] * 4);
+    const rounded = vals.map(v => Math.round(v / 4) * 4);
+    if (rounded.length < 10) return [];
+    const counts = {};
+    for (const v of rounded) counts[v] = (counts[v] || 0) + 1;
+    const maxCount = Math.max(...Object.values(counts));
+    const pct = maxCount / rounded.length;
+    const unique = [...new Set(rounded)].filter(v => v > 0);
+    if (pct <= 0.6 || unique.length > 3) return [];
+    const dominant = Object.entries(counts).sort((a, b) => b[1] - a[1])[0][0];
+    return [finding('monotonous-spacing', filePath, `~${dominant}px used ${maxCount}/${rounded.length} times (${Math.round(pct * 100)}%)`)];
+  },
+  // Em-dash overuse: 5+ em-dashes or "--" in body text content
+  // (occasional em-dash use in prose is fine; the pattern fires only
+  // when count crosses into AI-cadence territory).
+  (content, filePath) => {
+    const text = stripHtmlToText(content);
+    let count = 0;
+    const re = /[—]|--(?=\S)/g;
+    while (re.exec(text) !== null) count++;
+    if (count < 5) return [];
+    return [finding('em-dash-overuse', filePath, `${count} em-dashes in body text`)];
+  },
+  // Marketing buzzwords: SaaS phrase list
+  (content, filePath) => {
+    const text = stripHtmlToText(content);
+    const lower = text.toLowerCase();
+    const BUZZWORDS = [
+      'streamline your', 'empower your', 'supercharge your',
+      'unleash your', 'unleash the power', 'leverage the power',
+      'built for the modern', 'trusted by leading', 'trusted by the world',
+      'best-in-class', 'industry-leading', 'world-class', 'enterprise-grade',
+      'next-generation', 'cutting-edge', 'transform your business',
+      'revolutionize', 'game-changer', 'game changing',
+      'mission-critical', 'best of breed', 'future-proof', 'future proof',
+      'seamless experience', 'seamlessly integrate',
+      'drive engagement', 'drive growth', 'drive results',
+      'harness the power',
+    ];
+    let count = 0;
+    let firstSample = '';
+    for (const phrase of BUZZWORDS) {
+      let from = 0;
+      while (true) {
+        const idx = lower.indexOf(phrase, from);
+        if (idx === -1) break;
+        count++;
+        if (!firstSample) {
+          firstSample = text.slice(Math.max(0, idx - 12), Math.min(text.length, idx + phrase.length + 12)).trim();
+        }
+        from = idx + phrase.length;
+      }
+    }
+    if (count === 0) return [];
+    return [finding('marketing-buzzword', filePath, `${count} buzzword phrase${count === 1 ? '' : 's'}: "${firstSample}"`)];
+  },
+  // Numbered section markers (01 / 02 / 03 ...)
+  (content, filePath) => {
+    const text = stripHtmlToText(content);
+    const re = /\b(0[1-9]|1[0-2])\b/g;
+    const seen = new Set();
+    let m;
+    while ((m = re.exec(text)) !== null) seen.add(m[1]);
+    if (seen.size < 3) return [];
+    const sorted = [...seen].sort();
+    let sequential = 0;
+    for (let i = 1; i < sorted.length; i++) {
+      if (parseInt(sorted[i], 10) === parseInt(sorted[i - 1], 10) + 1) sequential++;
+    }
+    if (sequential < 2) return [];
+    return [finding('numbered-section-markers', filePath, `Sequence: ${sorted.slice(0, 6).join(', ')}`)];
+  },
+  // Aphoristic cadence: manufactured-contrast + short-rebuttal
+  (content, filePath) => {
+    const text = stripHtmlToText(content);
+    const NOT_A_RE = /\bNot an? [a-z][^.!?]{1,40}[.!]\s+[A-Z][^.!?]{1,60}[.!]/g;
+    const SHORT_REBUTTAL_RE = /\b[A-Z][^.!?]{4,80}[.!]\s+(No|Just)\s+[a-z][^.!?]{2,60}[.!]/g;
+    let count = 0;
+    let firstSample = '';
+    let m;
+    NOT_A_RE.lastIndex = 0;
+    while ((m = NOT_A_RE.exec(text)) !== null) {
+      count++;
+      if (!firstSample) firstSample = m[0].trim().slice(0, 80);
+    }
+    SHORT_REBUTTAL_RE.lastIndex = 0;
+    while ((m = SHORT_REBUTTAL_RE.exec(text)) !== null) {
+      count++;
+      if (!firstSample) firstSample = m[0].trim().slice(0, 80);
+    }
+    if (count < 3) return [];
+    return [finding('aphoristic-cadence', filePath, `${count} aphoristic constructions: "${firstSample}"`)];
+  },
+  // Dark glow (page-level: dark bg + colored box-shadow with blur)
+  (content, filePath) => {
+    // Check if page has a dark background
+    const darkBgRe = /background(?:-color)?\s*:\s*(?:#(?:0[0-9a-f]|1[0-9a-f]|2[0-3])[0-9a-f]{4}\b|#(?:0|1)[0-9a-f]{2}\b|rgb\(\s*(\d{1,2})\s*,\s*(\d{1,2})\s*,\s*(\d{1,2})\s*\))/gi;
+    const twDarkBg = /\bbg-(?:gray|slate|zinc|neutral|stone)-(?:9\d{2}|800)\b/;
+    const hasDarkBg = darkBgRe.test(content) || twDarkBg.test(content);
+    if (!hasDarkBg) return [];
+
+    // Check for colored box-shadow with blur > 4px
+    const shadowRe = /box-shadow\s*:\s*([^;{}]+)/gi;
+    let m;
+    while ((m = shadowRe.exec(content)) !== null) {
+      const val = m[1];
+      const colorMatch = val.match(/rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)/);
+      if (!colorMatch) continue;
+      const [r, g, b] = [+colorMatch[1], +colorMatch[2], +colorMatch[3]];
+      if ((Math.max(r, g, b) - Math.min(r, g, b)) < 30) continue; // skip gray
+      // Check blur: look for pattern like "0 0 20px" (third number > 4)
+      const pxVals = [...val.matchAll(/(\d+)px|(?<![.\d])\b(0)\b(?![.\d])/g)].map(p => +(p[1] || p[2]));
+      if (pxVals.length >= 3 && pxVals[2] > 4) {
+        const lines = content.substring(0, m.index).split('\n');
+        return [finding('dark-glow', filePath, `Colored glow (rgb(${r},${g},${b})) on dark page`, lines.length)];
+      }
+    }
+    return [];
+  },
+];
+
+// ---------------------------------------------------------------------------
+// Style block extraction (Vue/Svelte <style> blocks)
+// ---------------------------------------------------------------------------
+
+function extractStyleBlocks(content, ext) {
+  ext = ext.toLowerCase();
+  if (ext !== '.vue' && ext !== '.svelte') return [];
+  const blocks = [];
+  const re = /<style[^>]*>([\s\S]*?)<\/style>/gi;
+  let m;
+  while ((m = re.exec(content)) !== null) {
+    const before = content.substring(0, m.index);
+    const startLine = before.split('\n').length + 1;
+    blocks.push({ content: m[1], startLine });
+  }
+  return blocks;
+}
+
+// ---------------------------------------------------------------------------
+// CSS-in-JS extraction (styled-components, emotion)
+// ---------------------------------------------------------------------------
+
+const CSS_IN_JS_EXTENSIONS = new Set(['.js', '.ts', '.jsx', '.tsx']);
+
+function extractCSSinJS(content, ext) {
+  ext = ext.toLowerCase();
+  if (!CSS_IN_JS_EXTENSIONS.has(ext)) return [];
+  const blocks = [];
+  const re = /(?:styled(?:\.\w+|\([^)]+\))|css)\s*`([\s\S]*?)`/g;
+  let m;
+  while ((m = re.exec(content)) !== null) {
+    const before = content.substring(0, m.index);
+    const startLine = before.split('\n').length;
+    blocks.push({ content: m[1], startLine });
+  }
+  return blocks;
+}
+
+function runRegexMatchers(lines, filePath, lineOffset = 0, blockContext = null, options = {}) {
+  const { profile, phase = 'regex-matchers' } = options || {};
+  const findings = [];
+  if (!profile) {
+    for (const matcher of REGEX_MATCHERS) {
+      for (let i = 0; i < lines.length; i++) {
+        const line = lines[i];
+        matcher.regex.lastIndex = 0;
+        let m;
+        while ((m = matcher.regex.exec(line)) !== null) {
+          // For extracted blocks, use nearby lines as context for multi-line CSS patterns
+          const context = blockContext
+            ? lines.slice(Math.max(0, i - 3), Math.min(lines.length, i + 4)).join(' ')
+            : line;
+          if (matcher.test(m, context)) {
+            findings.push(finding(matcher.id, filePath, matcher.fmt(m, context), i + 1 + lineOffset));
+          }
+        }
+      }
+    }
+    return findings;
+  }
+
+  for (const matcher of REGEX_MATCHERS) {
+    const matcherFindings = profileFindings(profile, {
+      engine: 'regex',
+      phase,
+      ruleId: matcher.id,
+      target: filePath,
+    }, () => {
+      const matches = [];
+      for (let i = 0; i < lines.length; i++) {
+        const line = lines[i];
+        matcher.regex.lastIndex = 0;
+        let m;
+        while ((m = matcher.regex.exec(line)) !== null) {
+          // For extracted blocks, use nearby lines as context for multi-line CSS patterns
+          const context = blockContext
+            ? lines.slice(Math.max(0, i - 3), Math.min(lines.length, i + 4)).join(' ')
+            : line;
+          if (matcher.test(m, context)) {
+            matches.push(finding(matcher.id, filePath, matcher.fmt(m, context), i + 1 + lineOffset));
+          }
+        }
+      }
+      return matches;
+    });
+    findings.push(...matcherFindings);
+  }
+  return findings;
+}
+
+/** Page-level analyzers that scan rendered text content (em-dash use,
+ *  buzzword phrases, numbered section markers, aphoristic cadence).
+ *  These are detector-agnostic — they work on any HTML/text source
+ *  and don't need a parsed DOM. Exported so detectHtml can call them
+ *  for `.html` files (which otherwise skip the regex engine). */
+const TEXT_CONTENT_ANALYZER_IDS = [
+  'em-dash-overuse',
+  'marketing-buzzword',
+  'numbered-section-markers',
+  'aphoristic-cadence',
+];
+
+function runTextContentAnalyzers(content, filePath, options = {}) {
+  const profile = options?.profile;
+  if (!shouldRunPageAnalyzers(content, filePath)) return [];
+  // The 4 text-content analyzers are at indices 3-6 in REGEX_ANALYZERS.
+  const findings = [];
+  for (let i = 0; i < TEXT_CONTENT_ANALYZER_IDS.length; i++) {
+    const analyzer = REGEX_ANALYZERS[3 + i];
+    const ruleId = TEXT_CONTENT_ANALYZER_IDS[i];
+    findings.push(...profileFindings(profile, {
+      engine: 'regex',
+      phase: 'text-content',
+      ruleId,
+      target: filePath,
+    }, () => analyzer(content, filePath)));
+  }
+  return findings;
+}
+
+function detectText(content, filePath, options = {}) {
+  const profile = options?.profile;
+  const findings = [];
+  const lines = content.split('\n');
+  const ext = extFromFilePath(filePath);
+
+  // Run regex matchers on the full file content (catches Tailwind classes, inline styles)
+  // Enable block context for CSS files where related properties span multiple lines
+  const cssLike = new Set(['.css', '.scss', '.sass', '.less']);
+  findings.push(...runRegexMatchers(lines, filePath, 0, cssLike.has(ext) || null, {
+    profile,
+    phase: 'source',
+  }));
+
+  // Extract and scan <style> blocks from Vue/Svelte SFCs
+  const styleBlocks = profile
+    ? profileStep(profile, {
+      engine: 'regex',
+      phase: 'extract',
+      ruleId: 'style-blocks',
+      target: filePath,
+    }, () => extractStyleBlocks(content, ext))
+    : extractStyleBlocks(content, ext);
+  for (const block of styleBlocks) {
+    const blockLines = block.content.split('\n');
+    findings.push(...runRegexMatchers(blockLines, filePath, block.startLine - 1, true, {
+      profile,
+      phase: 'style-block',
+    }));
+  }
+
+  // Extract and scan CSS-in-JS template literals
+  const cssJsBlocks = profile
+    ? profileStep(profile, {
+      engine: 'regex',
+      phase: 'extract',
+      ruleId: 'css-in-js',
+      target: filePath,
+    }, () => extractCSSinJS(content, ext))
+    : extractCSSinJS(content, ext);
+  for (const block of cssJsBlocks) {
+    const blockLines = block.content.split('\n');
+    findings.push(...runRegexMatchers(blockLines, filePath, block.startLine - 1, true, {
+      profile,
+      phase: 'css-in-js',
+    }));
+  }
+
+  if (options?.designSystem) {
+    findings.push(...profileFindings(profile, {
+      engine: 'regex',
+      phase: 'source',
+      ruleId: 'design-system',
+      target: filePath,
+    }, () => checkSourceDesignSystem(content, filePath, { designSystem: options.designSystem })));
+  }
+
+  // Deduplicate findings (same antipattern + similar snippet, within 2 lines)
+  const deduped = [];
+  for (const f of findings) {
+    const isDupe = deduped.some(d =>
+      d.antipattern === f.antipattern &&
+      d.snippet === f.snippet &&
+      Math.abs(d.line - f.line) <= 2
+    );
+    if (!isDupe) deduped.push(f);
+  }
+
+  // Page-level analyzers only run on full pages
+  if (shouldRunPageAnalyzers(content, filePath)) {
+    const analyzerIds = [
+      'single-font',
+      'flat-type-hierarchy',
+      'monotonous-spacing',
+      'em-dash-overuse',
+      'marketing-buzzword',
+      'numbered-section-markers',
+      'aphoristic-cadence',
+      'dark-glow',
+    ];
+    for (let i = 0; i < REGEX_ANALYZERS.length; i++) {
+      const analyzer = REGEX_ANALYZERS[i];
+      deduped.push(...profileFindings(profile, {
+        engine: 'regex',
+        phase: 'page-analyzer',
+        ruleId: analyzerIds[i] || `analyzer-${i + 1}`,
+        target: filePath,
+      }, () => analyzer(content, filePath)));
+    }
+  }
+
+  const byProvider = filterByProviders(deduped, options?.providers);
+  // Inline `impeccable-disable*` waivers travel with the file; honor them unless
+  // explicitly bypassed (`--no-config` / `--no-inline-ignores`).
+  return options?.inlineIgnores === false ? byProvider : applyInlineIgnores(byProvider, content);
+}
+
+export {
+  REGEX_MATCHERS,
+  REGEX_ANALYZERS,
+  TEXT_CONTENT_ANALYZER_IDS,
+  extractStyleBlocks,
+  extractCSSinJS,
+  runRegexMatchers,
+  runTextContentAnalyzers,
+  detectText,
+};
diff --git a/tools/design-detector/detector/engines/static-html/css-cascade.mjs b/tools/design-detector/detector/engines/static-html/css-cascade.mjs
new file mode 100644
index 0000000..1d873f1
--- /dev/null
+++ b/tools/design-detector/detector/engines/static-html/css-cascade.mjs
@@ -0,0 +1,1015 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
+import { parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+
+// ---------------------------------------------------------------------------
+// jsdom CSS-variable border override map
+// ---------------------------------------------------------------------------
+//
+// jsdom's CSSOM silently drops any border shorthand that contains a var()
+// reference — the computed style for the element then shows empty width,
+// empty style, and a default black color. That's enough to hide the most
+// common real-world side-tab pattern in AI-generated pages:
+//
+//   :root { --brand: #87a8ff; }
+//   .card { border-left: 5px solid var(--brand); border-radius: 4px; }
+//
+// Real browsers (and therefore the browser detector path) resolve var()
+// natively, so this only affects the Node jsdom path.
+//
+// This pre-pass walks the stylesheets, finds any rule whose per-side or
+// all-sides border property contains var(), resolves the var() against
+// :root-level custom properties (read from the documentElement's computed
+// style, which jsdom DOES handle correctly), and attaches the resolved
+// width+color to every element that matches the rule's selector. The
+// Node-side `checkElementBorders` adapter consumes that map as a fallback
+// whenever jsdom's computed style came back empty.
+//
+// Limitations (intentional, to keep the pass simple):
+//   * Only :root-level custom properties are resolved. Scoped overrides on
+//     descendants are not tracked — uncommon in practice and would require
+//     a per-element cascade walk.
+//   * @media / @supports wrapped rules are ignored (jsdom often mishandles
+//     these anyway).
+//   * The fallback only fills sides that jsdom left empty, so any rule
+//     whose border parses normally still wins via the computed style.
+
+const BORDER_SHORTHAND_RE = /^(\d+(?:\.\d+)?)px\s+(solid|dashed|dotted|double|groove|ridge|inset|outset)\s+(.+)$/i;
+
+// isNeutralColor only understands rgba()/oklch()/lch()/lab()/hsl()/hwb().
+// CSS variables typically hold hex or named colors, so normalize those to
+// rgb() before handing the value off to the shared check. Anything we don't
+// recognise is passed through unchanged — isNeutralColor then treats it as
+// non-neutral, which is the safer default (matches the oklch-era bugfix).
+const NAMED_COLORS = {
+  white: [255, 255, 255], black: [0, 0, 0], gray: [128, 128, 128],
+  grey: [128, 128, 128], silver: [192, 192, 192], red: [255, 0, 0],
+  green: [0, 128, 0], blue: [0, 0, 255], yellow: [255, 255, 0],
+};
+
+function normalizeColorForCheck(value) {
+  if (!value) return value;
+  const v = value.trim();
+  const hex6 = v.match(/^#([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})$/i);
+  if (hex6) {
+    const [r, g, b] = [parseInt(hex6[1], 16), parseInt(hex6[2], 16), parseInt(hex6[3], 16)];
+    return `rgb(${r}, ${g}, ${b})`;
+  }
+  const hex3 = v.match(/^#([0-9a-f])([0-9a-f])([0-9a-f])$/i);
+  if (hex3) {
+    const [r, g, b] = [
+      parseInt(hex3[1] + hex3[1], 16),
+      parseInt(hex3[2] + hex3[2], 16),
+      parseInt(hex3[3] + hex3[3], 16),
+    ];
+    return `rgb(${r}, ${g}, ${b})`;
+  }
+  const named = NAMED_COLORS[v.toLowerCase()];
+  if (named) return `rgb(${named[0]}, ${named[1]}, ${named[2]})`;
+  return v;
+}
+
+function buildBorderOverrideMap(document, window) {
+  const map = new Map();
+  const rootStyle = window.getComputedStyle(document.documentElement);
+
+  function resolveVar(value, depth = 0) {
+    if (!value || depth > 10 || !value.includes('var(')) return value;
+    return value.replace(
+      /var\(\s*(--[\w-]+)\s*(?:,\s*([^)]+))?\s*\)/g,
+      (_, name, fallback) => {
+        const v = rootStyle.getPropertyValue(name).trim();
+        if (v) return resolveVar(v, depth + 1);
+        if (fallback) return resolveVar(fallback.trim(), depth + 1);
+        return '';
+      }
+    );
+  }
+
+  function parseShorthand(text) {
+    const m = text.trim().match(BORDER_SHORTHAND_RE);
+    if (!m) return null;
+    return { width: parseFloat(m[1]), color: normalizeColorForCheck(m[3]) };
+  }
+
+  // Read from the per-property accessors on rule.style. jsdom preserves
+  // each border-* shorthand it parsed, even when the overall cssText has
+  // been truncated (e.g. a `border: 1px solid var(...)` followed by a
+  // `border-left: ...` loses the first declaration but keeps the second).
+  const SIDE_PROPS = [
+    ['borderLeft', 'Left'],
+    ['borderRight', 'Right'],
+    ['borderTop', 'Top'],
+    ['borderBottom', 'Bottom'],
+    ['borderInlineStart', 'Left'],
+    ['borderInlineEnd', 'Right'],
+  ];
+
+  for (const sheet of document.styleSheets) {
+    let rules;
+    try { rules = sheet.cssRules || []; } catch { continue; }
+    for (const rule of rules) {
+      // CSSStyleRule only; skip @media / @keyframes / @supports wrappers.
+      if (rule.type !== 1 || !rule.style || !rule.selectorText) continue;
+
+      const perSide = {};
+
+      for (const [prop, side] of SIDE_PROPS) {
+        const val = rule.style[prop];
+        if (!val || !val.includes('var(')) continue;
+        const parsed = parseShorthand(resolveVar(val));
+        if (parsed && parsed.color) perSide[side] = parsed;
+      }
+
+      // Uniform `border: <w> <style> var(...)` applies to every side the
+      // per-side map didn't already claim.
+      const borderAll = rule.style.border;
+      if (borderAll && borderAll.includes('var(')) {
+        const parsed = parseShorthand(resolveVar(borderAll));
+        if (parsed && parsed.color) {
+          for (const s of ['Top', 'Right', 'Bottom', 'Left']) {
+            if (!perSide[s]) perSide[s] = parsed;
+          }
+        }
+      }
+
+      // Longhand `border-*-color: var(...)` with width/style in separate
+      // declarations. Rare in AI-generated pages, but cheap to cover.
+      for (const [prop, side] of [
+        ['borderLeftColor', 'Left'],
+        ['borderRightColor', 'Right'],
+        ['borderTopColor', 'Top'],
+        ['borderBottomColor', 'Bottom'],
+      ]) {
+        const val = rule.style[prop];
+        if (!val || !val.includes('var(')) continue;
+        const resolved = resolveVar(val).trim();
+        if (!resolved) continue;
+        // Width may or may not come from this rule — that's fine; the
+        // adapter only substitutes the color when jsdom left it as a
+        // literal var() string.
+        if (!perSide[side]) perSide[side] = { width: 0, color: normalizeColorForCheck(resolved) };
+      }
+
+      if (Object.keys(perSide).length === 0) continue;
+
+      let matched;
+      try { matched = document.querySelectorAll(rule.selectorText); }
+      catch { continue; }
+
+      for (const el of matched) {
+        const existing = map.get(el);
+        if (existing) {
+          // Later rules overwrite earlier ones — approximates source-order
+          // cascade for equal-specificity rules and is good enough for the
+          // uncontested var()-dropped sides we're trying to recover.
+          Object.assign(existing, perSide);
+        } else {
+          map.set(el, { ...perSide });
+        }
+      }
+    }
+  }
+
+  return map;
+}
+
+// Strip `@layer NAME { … }` wrappers from a CSS / HTML source, leaving
+// the inner rules as flat CSS. jsdom doesn't implement CSS @layer, so
+// any rule inside a layer block becomes invisible to getComputedStyle.
+// Tailwind v4 makes this ubiquitous: every utility class lives in
+// `@layer utilities`, and Preflight lives in `@layer base`. Without
+// unwrapping, every Tailwind-styled element returns empty computed
+// styles. We walk the source character-by-character, balancing braces
+// so we correctly handle nested style rules inside the layer block.
+function unwrapCssAtLayer(source) {
+  if (!source || !source.includes('@layer')) return source;
+  // Find `@layer <name>? {` openers. The match starts at the @, and
+  // we then balance braces from the opening { onward.
+  const re = /@layer\b[^{;]*\{/g;
+  let out = '';
+  let lastIdx = 0;
+  let m;
+  while ((m = re.exec(source)) !== null) {
+    const openStart = m.index;
+    const openEnd = m.index + m[0].length; // position right after `{`
+    let depth = 1;
+    let i = openEnd;
+    while (i < source.length && depth > 0) {
+      const c = source.charCodeAt(i);
+      if (c === 0x7b /* { */) depth++;
+      else if (c === 0x7d /* } */) depth--;
+      i++;
+    }
+    if (depth !== 0) {
+      // Unbalanced — bail and return source unchanged.
+      return source;
+    }
+    // Emit everything before the @layer, then the inner contents
+    // (between the opening { and the matched closing }), then advance.
+    out += source.slice(lastIdx, openStart);
+    out += source.slice(openEnd, i - 1); // i-1 = position of the closing }
+    lastIdx = i;
+    re.lastIndex = i;
+  }
+  out += source.slice(lastIdx);
+  return out;
+}
+
+// ---------------------------------------------------------------------------
+// Static HTML/CSS detection (default for local HTML files)
+// ---------------------------------------------------------------------------
+
+const STATIC_INHERITED_PROPS = new Set([
+  'color', 'fontFamily', 'fontSize', 'fontStyle', 'fontWeight',
+  'lineHeight', 'letterSpacing', 'textTransform', 'textAlign', 'hyphens',
+  'webkitHyphens',
+]);
+
+const STATIC_DEFAULT_STYLE = {
+  color: 'rgb(0, 0, 0)',
+  backgroundColor: 'rgba(0, 0, 0, 0)',
+  backgroundImage: 'none',
+  borderTopWidth: '0px',
+  borderRightWidth: '0px',
+  borderBottomWidth: '0px',
+  borderLeftWidth: '0px',
+  borderTopColor: 'rgb(0, 0, 0)',
+  borderRightColor: 'rgb(0, 0, 0)',
+  borderBottomColor: 'rgb(0, 0, 0)',
+  borderLeftColor: 'rgb(0, 0, 0)',
+  borderRadius: '0px',
+  outlineWidth: '0px',
+  outlineColor: 'rgb(0, 0, 0)',
+  outlineStyle: 'none',
+  boxShadow: 'none',
+  fontFamily: '',
+  fontSize: '16px',
+  fontStyle: 'normal',
+  fontWeight: '400',
+  lineHeight: 'normal',
+  letterSpacing: 'normal',
+  textTransform: 'none',
+  textAlign: 'start',
+  hyphens: 'manual',
+  webkitHyphens: 'manual',
+  transitionProperty: '',
+  transitionTimingFunction: '',
+  animationName: '',
+  animationTimingFunction: '',
+  webkitBackgroundClip: '',
+  backgroundClip: '',
+  width: '',
+  height: '',
+  paddingTop: '0px',
+  paddingRight: '0px',
+  paddingBottom: '0px',
+  paddingLeft: '0px',
+  marginTop: '0px',
+  marginRight: '0px',
+  marginBottom: '0px',
+  marginLeft: '0px',
+  position: 'static',
+  visibility: 'visible',
+  top: 'auto',
+  right: 'auto',
+  bottom: 'auto',
+  left: 'auto',
+  inset: '',
+  display: '',
+  overflow: 'visible',
+  overflowX: 'visible',
+  overflowY: 'visible',
+};
+
+const STATIC_PROP_MAP = {
+  'background-color': 'backgroundColor',
+  'background-image': 'backgroundImage',
+  'background-clip': 'backgroundClip',
+  '-webkit-background-clip': 'webkitBackgroundClip',
+  'border-radius': 'borderRadius',
+  'border-top-width': 'borderTopWidth',
+  'border-right-width': 'borderRightWidth',
+  'border-bottom-width': 'borderBottomWidth',
+  'border-left-width': 'borderLeftWidth',
+  'border-top-color': 'borderTopColor',
+  'border-right-color': 'borderRightColor',
+  'border-bottom-color': 'borderBottomColor',
+  'border-left-color': 'borderLeftColor',
+  'outline-width': 'outlineWidth',
+  'outline-color': 'outlineColor',
+  'outline-style': 'outlineStyle',
+  'box-shadow': 'boxShadow',
+  'font-family': 'fontFamily',
+  'font-size': 'fontSize',
+  'font-style': 'fontStyle',
+  'font-weight': 'fontWeight',
+  'line-height': 'lineHeight',
+  'letter-spacing': 'letterSpacing',
+  'text-transform': 'textTransform',
+  'text-align': 'textAlign',
+  'hyphens': 'hyphens',
+  '-webkit-hyphens': 'webkitHyphens',
+  'transition-property': 'transitionProperty',
+  'transition-timing-function': 'transitionTimingFunction',
+  'animation-name': 'animationName',
+  'animation-timing-function': 'animationTimingFunction',
+  'width': 'width',
+  'height': 'height',
+  'padding-top': 'paddingTop',
+  'padding-right': 'paddingRight',
+  'padding-bottom': 'paddingBottom',
+  'padding-left': 'paddingLeft',
+  'margin-top': 'marginTop',
+  'margin-right': 'marginRight',
+  'margin-bottom': 'marginBottom',
+  'margin-left': 'marginLeft',
+  'position': 'position',
+  'visibility': 'visibility',
+  'top': 'top',
+  'right': 'right',
+  'bottom': 'bottom',
+  'left': 'left',
+  'inset': 'inset',
+  'display': 'display',
+  'overflow': 'overflow',
+  'overflow-x': 'overflowX',
+  'overflow-y': 'overflowY',
+};
+
+const STATIC_NAMED_COLORS = {
+  black: { r: 0, g: 0, b: 0, a: 1 },
+  white: { r: 255, g: 255, b: 255, a: 1 },
+  transparent: { r: 0, g: 0, b: 0, a: 0 },
+  gray: { r: 128, g: 128, b: 128, a: 1 },
+  grey: { r: 128, g: 128, b: 128, a: 1 },
+  silver: { r: 192, g: 192, b: 192, a: 1 },
+  red: { r: 255, g: 0, b: 0, a: 1 },
+  green: { r: 0, g: 128, b: 0, a: 1 },
+  blue: { r: 0, g: 0, b: 255, a: 1 },
+};
+
+function splitCssList(value) {
+  const parts = [];
+  let depth = 0, quote = '', start = 0;
+  for (let i = 0; i < value.length; i++) {
+    const ch = value[i];
+    if (quote) {
+      if (ch === quote && value[i - 1] !== '\\') quote = '';
+      continue;
+    }
+    if (ch === '"' || ch === "'") { quote = ch; continue; }
+    if (ch === '(' || ch === '[') depth++;
+    else if (ch === ')' || ch === ']') depth = Math.max(0, depth - 1);
+    else if (ch === ',' && depth === 0) {
+      parts.push(value.slice(start, i).trim());
+      start = i + 1;
+    }
+  }
+  const tail = value.slice(start).trim();
+  if (tail) parts.push(tail);
+  return parts;
+}
+
+function splitCssTokens(value) {
+  const tokens = [];
+  let depth = 0, quote = '', current = '';
+  for (let i = 0; i < value.length; i++) {
+    const ch = value[i];
+    if (quote) {
+      current += ch;
+      if (ch === quote && value[i - 1] !== '\\') quote = '';
+      continue;
+    }
+    if (ch === '"' || ch === "'") { quote = ch; current += ch; continue; }
+    if (ch === '(') { depth++; current += ch; continue; }
+    if (ch === ')') { depth = Math.max(0, depth - 1); current += ch; continue; }
+    if (/\s/.test(ch) && depth === 0) {
+      if (current) { tokens.push(current); current = ''; }
+      continue;
+    }
+    current += ch;
+  }
+  if (current) tokens.push(current);
+  return tokens;
+}
+
+function cssPropToCamel(prop) {
+  if (!prop) return prop;
+  const mapped = STATIC_PROP_MAP[prop];
+  if (mapped) return mapped;
+  return prop.replace(/-([a-z])/g, (_m, ch) => ch.toUpperCase());
+}
+
+function staticColorToCss(c) {
+  if (!c) return '';
+  if (c.a != null && c.a < 1) return `rgba(${c.r}, ${c.g}, ${c.b}, ${Number(c.a.toFixed(3))})`;
+  return `rgb(${c.r}, ${c.g}, ${c.b})`;
+}
+
+function parseStaticColor(value) {
+  const parsed = parseAnyColor(value);
+  if (parsed) return parsed;
+  const named = STATIC_NAMED_COLORS[String(value || '').trim().toLowerCase()];
+  return named ? { ...named } : null;
+}
+
+function extractStaticColor(value) {
+  if (!value) return '';
+  const raw = String(value).trim();
+  if (/^var\(/i.test(raw)) return raw;
+  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  if (!colorLike) return '';
+  return colorLike[0];
+}
+
+function normalizeStaticCssValue(prop, value, customProps, parentStyle, currentStyle = null) {
+  let resolved = resolveVarRefs(String(value || '').trim(), customProps);
+  if (resolved === 'inherit') return parentStyle?.[prop] || STATIC_DEFAULT_STYLE[prop] || '';
+  const isModernBorderColor = /^border[A-Z][a-z]+Color$/.test(prop) && /^(?:oklch|oklab|lch|lab|hsl|hwb)\(/i.test(resolved);
+  if (!isModernBorderColor && (/color$/i.test(prop) || prop === 'color' || prop === 'backgroundColor')) {
+    const parsed = parseStaticColor(resolved);
+    if (parsed) resolved = staticColorToCss(parsed);
+  }
+  if (prop === 'fontSize') {
+    const base = parseFloat(parentStyle?.fontSize) || 16;
+    const px = resolveLengthPx(resolved, base);
+    if (px != null) resolved = `${px}px`;
+  }
+  if (prop === 'letterSpacing') {
+    const base = parseFloat(currentStyle?.fontSize || parentStyle?.fontSize) || 16;
+    const px = resolveLengthPx(resolved, base);
+    if (px != null) resolved = `${px}px`;
+  }
+  if (prop === 'lineHeight' && resolved !== 'normal') {
+    const base = parseFloat(currentStyle?.fontSize || parentStyle?.fontSize) || 16;
+    const px = resolveLengthPx(resolved, base);
+    if (px != null) resolved = `${px}px`;
+  }
+  return resolved;
+}
+
+function expandStaticBoxValues(tokens) {
+  if (tokens.length === 0) return ['0px', '0px', '0px', '0px'];
+  if (tokens.length === 1) return [tokens[0], tokens[0], tokens[0], tokens[0]];
+  if (tokens.length === 2) return [tokens[0], tokens[1], tokens[0], tokens[1]];
+  if (tokens.length === 3) return [tokens[0], tokens[1], tokens[2], tokens[1]];
+  return [tokens[0], tokens[1], tokens[2], tokens[3]];
+}
+
+function parseStaticBorder(value) {
+  const tokens = splitCssTokens(value);
+  let width = '', color = '';
+  for (const token of tokens) {
+    if (!width && /^-?[\d.]+(?:px|rem|em|%)$/.test(token)) width = token;
+    if (!color) color = extractStaticColor(token);
+  }
+  return { width, color };
+}
+
+function parseStaticFont(value) {
+  const out = [];
+  const slashParts = value.match(/(?:^|\s)([\d.]+(?:px|rem|em|%))(?:\/([^\s]+))?/);
+  if (/\bitalic\b/i.test(value)) out.push(['fontStyle', 'italic']);
+  const weight = value.match(/\b([1-9]00|bold|normal|lighter|bolder)\b/i);
+  if (weight) out.push(['fontWeight', weight[1]]);
+  if (slashParts) {
+    out.push(['fontSize', slashParts[1]]);
+    if (slashParts[2]) out.push(['lineHeight', slashParts[2]]);
+    const familyStart = value.indexOf(slashParts[0]) + slashParts[0].length;
+    const family = value.slice(familyStart).trim();
+    if (family) out.push(['fontFamily', family]);
+  }
+  return out;
+}
+
+function parseStaticTransition(value) {
+  const props = [];
+  const timings = [];
+  for (const item of splitCssList(value)) {
+    const tokens = splitCssTokens(item);
+    const timing = tokens.find(token => /^(?:ease|linear|step-|cubic-bezier\()/i.test(token));
+    if (timing) timings.push(timing);
+    const prop = tokens.find(token => /^[a-z-]+$/i.test(token) && !/^(?:ease|linear|infinite|alternate|forwards|backwards|both|normal|none)$/.test(token) && !/s$/.test(token));
+    if (prop) props.push(prop);
+  }
+  return {
+    property: props.join(', '),
+    timing: timings.join(', '),
+  };
+}
+
+function parseStaticAnimation(value) {
+  const names = [];
+  const timings = [];
+  for (const item of splitCssList(value)) {
+    const tokens = splitCssTokens(item);
+    const timing = tokens.find(token => /^(?:ease|linear|step-|cubic-bezier\()/i.test(token));
+    if (timing) timings.push(timing);
+    const name = tokens.find(token =>
+      /^[a-z_-][\w-]*$/i.test(token) &&
+      !/^(?:ease|linear|infinite|alternate|forwards|backwards|both|normal|none|running|paused)$/.test(token)
+    );
+    if (name) names.push(name);
+  }
+  return {
+    name: names.join(', '),
+    timing: timings.join(', '),
+  };
+}
+
+function expandStaticDeclaration(prop, value) {
+  const p = prop.toLowerCase();
+  const v = String(value || '').trim();
+  if (!v) return [];
+  if (p.startsWith('--')) return [[p, v]];
+  if (p === 'background') {
+    const out = [];
+    const hasImage = /gradient|url\(/i.test(v);
+    if (hasImage) out.push(['backgroundImage', v]);
+    const beforeImage = hasImage ? v.split(/(?:repeating-)?(?:linear|radial|conic)-gradient\(|url\(/i)[0] : v;
+    const color = extractStaticColor(hasImage ? beforeImage : v);
+    if (color) out.push(['backgroundColor', color]);
+    return out;
+  }
+  if (p === 'border') {
+    const parsed = parseStaticBorder(v);
+    const out = [];
+    for (const side of ['Top', 'Right', 'Bottom', 'Left']) {
+      if (parsed.width) out.push([`border${side}Width`, parsed.width]);
+      if (parsed.color) out.push([`border${side}Color`, parsed.color]);
+    }
+    return out;
+  }
+  if (p === 'outline') {
+    // `outline` shorthand: width | style | color, in any order. Reuse the
+    // border parser for width + color, then sniff a style keyword from the
+    // tokens (solid|dashed|...). `outline: 0` (single-token zero) zeros
+    // the width and effectively hides the outline.
+    const tokens = splitCssTokens(v);
+    const parsed = parseStaticBorder(v);
+    const styleToken = tokens.find(t =>
+      /^(none|hidden|solid|dashed|dotted|double|groove|ridge|inset|outset)$/i.test(t)
+    );
+    const out = [];
+    if (parsed.width) out.push(['outlineWidth', parsed.width]);
+    if (parsed.color) out.push(['outlineColor', parsed.color]);
+    if (styleToken) out.push(['outlineStyle', styleToken.toLowerCase()]);
+    // `outline: 0` with no other tokens: explicit zero width.
+    if (!parsed.width && /^0(?:px|rem|em|%)?$/.test(v.trim())) {
+      out.push(['outlineWidth', '0px']);
+    }
+    return out;
+  }
+  const sideMatch = p.match(/^border-(top|right|bottom|left)$/);
+  if (sideMatch) {
+    const parsed = parseStaticBorder(v);
+    const side = sideMatch[1][0].toUpperCase() + sideMatch[1].slice(1);
+    return [
+      ...(parsed.width ? [[`border${side}Width`, parsed.width]] : []),
+      ...(parsed.color ? [[`border${side}Color`, parsed.color]] : []),
+    ];
+  }
+  if (p === 'border-width') {
+    const vals = expandStaticBoxValues(splitCssTokens(v));
+    return [
+      ['borderTopWidth', vals[0]],
+      ['borderRightWidth', vals[1]],
+      ['borderBottomWidth', vals[2]],
+      ['borderLeftWidth', vals[3]],
+    ];
+  }
+  if (p === 'border-color') {
+    const vals = expandStaticBoxValues(splitCssTokens(v));
+    return [
+      ['borderTopColor', vals[0]],
+      ['borderRightColor', vals[1]],
+      ['borderBottomColor', vals[2]],
+      ['borderLeftColor', vals[3]],
+    ];
+  }
+  if (p === 'padding') {
+    const vals = expandStaticBoxValues(splitCssTokens(v));
+    return [
+      ['paddingTop', vals[0]],
+      ['paddingRight', vals[1]],
+      ['paddingBottom', vals[2]],
+      ['paddingLeft', vals[3]],
+    ];
+  }
+  if (p === 'margin') {
+    const vals = expandStaticBoxValues(splitCssTokens(v));
+    return [
+      ['marginTop', vals[0]],
+      ['marginRight', vals[1]],
+      ['marginBottom', vals[2]],
+      ['marginLeft', vals[3]],
+    ];
+  }
+  if (p === 'font') return parseStaticFont(v);
+  if (p === 'transition') {
+    const parsed = parseStaticTransition(v);
+    return [
+      ...(parsed.property ? [['transitionProperty', parsed.property]] : []),
+      ...(parsed.timing ? [['transitionTimingFunction', parsed.timing]] : []),
+    ];
+  }
+  if (p === 'animation') {
+    const parsed = parseStaticAnimation(v);
+    return [
+      ...(parsed.name ? [['animationName', parsed.name]] : []),
+      ...(parsed.timing ? [['animationTimingFunction', parsed.timing]] : []),
+    ];
+  }
+  const mapped = cssPropToCamel(p);
+  if (STATIC_DEFAULT_STYLE[mapped] != null || STATIC_INHERITED_PROPS.has(mapped)) {
+    return [[mapped, v]];
+  }
+  return [];
+}
+
+function compareStaticPriority(a, b) {
+  if (!a) return true;
+  if (!!b.important !== !!a.important) return !!b.important;
+  if (!!b.inline !== !!a.inline) return !!b.inline;
+  for (let i = 0; i < 3; i++) {
+    if ((b.specificity[i] || 0) !== (a.specificity[i] || 0)) {
+      return (b.specificity[i] || 0) > (a.specificity[i] || 0);
+    }
+  }
+  return b.order >= a.order;
+}
+
+function staticSpecificity(selector) {
+  const noWhere = selector.replace(/:where\([^)]*\)/g, '');
+  const ids = (noWhere.match(/#[\w-]+/g) || []).length;
+  const classes = (noWhere.match(/\.[\w-]+|\[[^\]]+\]|:(?!:)[\w-]+(?:\([^)]*\))?/g) || []).length;
+  const stripped = noWhere
+    .replace(/#[\w-]+/g, ' ')
+    .replace(/\.[\w-]+|\[[^\]]+\]|:{1,2}[\w-]+(?:\([^)]*\))?/g, ' ')
+    .replace(/[*>+~(),]/g, ' ');
+  const types = (stripped.match(/\b[a-zA-Z][\w-]*\b/g) || []).length;
+  return [ids, classes, types];
+}
+
+function applyStaticDeclaration(specified, node, prop, value, meta) {
+  let map = specified.get(node);
+  if (!map) { map = new Map(); specified.set(node, map); }
+  for (const [expandedProp, expandedValue] of expandStaticDeclaration(prop, value)) {
+    const existing = map.get(expandedProp);
+    const next = { ...meta, prop: expandedProp, value: expandedValue };
+    if (compareStaticPriority(existing, next)) map.set(expandedProp, next);
+  }
+}
+
+function parseStaticStyleAttribute(styleText, orderBase = 0) {
+  const decls = [];
+  for (const part of String(styleText || '').split(';')) {
+    const idx = part.indexOf(':');
+    if (idx <= 0) continue;
+    const prop = part.slice(0, idx).trim();
+    let value = part.slice(idx + 1).trim();
+    const important = /!important\s*$/i.test(value);
+    value = value.replace(/\s*!important\s*$/i, '').trim();
+    decls.push({ prop, value, important, order: orderBase + decls.length });
+  }
+  return decls;
+}
+
+function collectStaticCssRules(cssText, csstree) {
+  const rules = [];
+  let ast;
+  try {
+    ast = csstree.parse(cssText, { positions: false, parseValue: true, parseCustomProperty: false });
+  } catch {
+    return rules;
+  }
+  let order = 0;
+  const walkList = (list, atRuleStack = []) => {
+    list?.forEach?.(node => {
+      if (node.type === 'Rule' && node.block) {
+        if (atRuleStack.some(name => /keyframes$/i.test(name))) return;
+        const selectorText = csstree.generate(node.prelude).trim();
+        const declarations = [];
+        node.block.children?.forEach?.(child => {
+          if (child.type !== 'Declaration') return;
+          declarations.push({
+            prop: child.property,
+            value: csstree.generate(child.value).trim(),
+            important: !!child.important,
+          });
+        });
+        for (const selector of splitCssList(selectorText)) {
+          if (selector) rules.push({ selector, declarations, specificity: staticSpecificity(selector), order: order++ });
+        }
+        return;
+      }
+      if (node.type === 'Atrule' && node.block) {
+        const name = String(node.name || '').toLowerCase();
+        if (name === 'media' || name === 'supports' || name === 'layer') {
+          walkList(node.block.children, [...atRuleStack, name]);
+        }
+      }
+    });
+  };
+  walkList(ast.children);
+  return rules;
+}
+
+class StaticElement {
+  constructor(node, doc) {
+    this.node = node;
+    this._doc = doc;
+    this.nodeType = 1;
+    this.tagName = String(node.name || '').toUpperCase();
+    this.nodeName = this.tagName;
+  }
+  get parentElement() {
+    let cur = this.node.parent;
+    while (cur && cur.type !== 'tag') cur = cur.parent;
+    return cur ? this._doc.wrap(cur) : null;
+  }
+  get previousElementSibling() {
+    let cur = this.node.prev;
+    while (cur && cur.type !== 'tag') cur = cur.prev;
+    return cur ? this._doc.wrap(cur) : null;
+  }
+  get children() {
+    return (this.node.children || []).filter(child => child.type === 'tag').map(child => this._doc.wrap(child));
+  }
+  get childNodes() {
+    return (this.node.children || []).map(child => {
+      if (child.type === 'text') return { nodeType: 3, textContent: child.data || '' };
+      if (child.type === 'tag') return this._doc.wrap(child);
+      return { nodeType: 8, textContent: child.data || '' };
+    });
+  }
+  get textContent() {
+    return this._doc.domutils.textContent(this.node);
+  }
+  get className() {
+    return this.getAttribute('class') || '';
+  }
+  get id() {
+    return this.getAttribute('id') || '';
+  }
+  getAttribute(name) {
+    return this.node.attribs?.[name] ?? null;
+  }
+  querySelector(selector) {
+    try {
+      const found = this._doc.selectOne(selector, this.node.children || []);
+      return found ? this._doc.wrap(found) : null;
+    } catch {
+      return null;
+    }
+  }
+  querySelectorAll(selector) {
+    try {
+      return this._doc.selectAll(selector, this.node.children || []).map(node => this._doc.wrap(node));
+    } catch {
+      return [];
+    }
+  }
+  closest(selector) {
+    let cur = this.node;
+    while (cur && cur.type === 'tag') {
+      try {
+        if (this._doc.is(cur, selector)) return this._doc.wrap(cur);
+      } catch {
+        return null;
+      }
+      cur = cur.parent;
+      while (cur && cur.type !== 'tag') cur = cur.parent;
+    }
+    return null;
+  }
+  contains(other) {
+    let cur = other?.node || null;
+    while (cur) {
+      if (cur === this.node) return true;
+      cur = cur.parent;
+    }
+    return false;
+  }
+}
+
+class StaticDocument {
+  constructor(root, modules) {
+    this.root = root;
+    this.selectAll = modules.selectAll;
+    this.selectOne = modules.selectOne;
+    this.is = modules.is;
+    this.domutils = modules.domutils;
+    this._wrappers = new WeakMap();
+    this._styleMap = new WeakMap();
+  }
+  wrap(node) {
+    let wrapped = this._wrappers.get(node);
+    if (!wrapped) {
+      wrapped = new StaticElement(node, this);
+      this._wrappers.set(node, wrapped);
+    }
+    return wrapped;
+  }
+  querySelectorAll(selector) {
+    try {
+      return this.selectAll(selector, this.root.children || []).map(node => this.wrap(node));
+    } catch {
+      return [];
+    }
+  }
+  querySelector(selector) {
+    try {
+      const found = this.selectOne(selector, this.root.children || []);
+      return found ? this.wrap(found) : null;
+    } catch {
+      return null;
+    }
+  }
+  get documentElement() {
+    return this.querySelector('html');
+  }
+  get body() {
+    return this.querySelector('body');
+  }
+  setStyle(node, style) {
+    this._styleMap.set(node, style);
+  }
+  getStyle(el) {
+    return this._styleMap.get(el.node) || makeStaticStyle();
+  }
+}
+
+function makeStaticStyle(values = {}) {
+  const style = { ...STATIC_DEFAULT_STYLE, ...values };
+  style.getPropertyValue = (prop) => {
+    const key = cssPropToCamel(prop);
+    return style[key] || style[prop] || '';
+  };
+  return style;
+}
+
+function buildStaticWindow(staticDoc) {
+  return {
+    document: staticDoc,
+    getComputedStyle: (el) => staticDoc.getStyle(el),
+  };
+}
+
+function collectStaticCssText(root, fileDir, profile, filePath, modules) {
+  const styleTexts = [];
+  for (const styleEl of modules.selectAll('style', root.children || [])) {
+    styleTexts.push(modules.domutils.textContent(styleEl));
+  }
+  const links = modules.selectAll('link', root.children || []);
+  for (const link of links) {
+    const rel = link.attribs?.rel || '';
+    const href = link.attribs?.href || '';
+    if (!/\bstylesheet\b/i.test(rel) || !href || /^(https?:)?\/\//i.test(href)) continue;
+    const cssPath = path.resolve(fileDir, href);
+    try {
+      const css = profileStep(profile, {
+        engine: 'static-html',
+        phase: 'preprocess',
+        ruleId: 'inline-linked-stylesheet',
+        target: filePath,
+        detail: href,
+      }, () => fs.readFileSync(cssPath, 'utf-8'));
+      styleTexts.push(css);
+    } catch { /* skip unreadable */ }
+  }
+  return styleTexts.join('\n');
+}
+
+function buildStaticStyleMap(root, staticDoc, cssText, modules, profile, filePath) {
+  const specified = new Map();
+  const allNodes = modules.selectAll('*', root.children || []);
+  const rules = profileStep(profile, {
+    engine: 'static-html',
+    phase: 'parse-css',
+    ruleId: 'css-rules',
+    target: filePath,
+  }, () => collectStaticCssRules(cssText, modules.csstree));
+
+  profileStep(profile, {
+    engine: 'static-html',
+    phase: 'selector-match',
+    ruleId: 'css-selectors',
+    target: filePath,
+  }, () => {
+    for (const rule of rules) {
+      let matched;
+      try {
+        matched = modules.selectAll(rule.selector, root.children || []);
+      } catch {
+        recordProfileEvent(profile, {
+          engine: 'static-html',
+          phase: 'selector-match',
+          ruleId: 'unsupported-selector',
+          target: filePath,
+          ms: 0,
+          findings: 0,
+          detail: rule.selector,
+        });
+        continue;
+      }
+      for (const node of matched) {
+        for (const decl of rule.declarations) {
+          applyStaticDeclaration(specified, node, decl.prop, decl.value, {
+            important: decl.important,
+            specificity: rule.specificity,
+            order: rule.order,
+            inline: false,
+          });
+        }
+      }
+    }
+
+    let inlineOrder = rules.length + 1;
+    for (const node of allNodes) {
+      const styleText = node.attribs?.style;
+      if (!styleText) continue;
+      for (const decl of parseStaticStyleAttribute(styleText, inlineOrder)) {
+        applyStaticDeclaration(specified, node, decl.prop, decl.value, {
+          important: decl.important,
+          specificity: [1, 0, 0],
+          order: decl.order,
+          inline: true,
+        });
+      }
+      inlineOrder += 1000;
+    }
+  });
+
+  const computeNode = (node, parentStyle = null, parentCustom = new Map()) => {
+    const specifiedMap = specified.get(node) || new Map();
+    const customProps = new Map(parentCustom);
+    for (const [prop, decl] of specifiedMap) {
+      if (prop.startsWith('--')) customProps.set(prop, resolveVarRefs(decl.value, customProps));
+    }
+    const values = {};
+    for (const prop of Object.keys(STATIC_DEFAULT_STYLE)) {
+      if (STATIC_INHERITED_PROPS.has(prop) && parentStyle?.[prop] != null) values[prop] = parentStyle[prop];
+      else values[prop] = STATIC_DEFAULT_STYLE[prop];
+    }
+    for (const [prop, decl] of specifiedMap) {
+      if (prop.startsWith('--')) continue;
+      values[prop] = normalizeStaticCssValue(prop, decl.value, customProps, parentStyle, values);
+    }
+    const style = makeStaticStyle(values);
+    staticDoc.setStyle(node, style);
+    for (const child of node.children || []) {
+      if (child.type === 'tag') computeNode(child, style, customProps);
+    }
+  };
+
+  profileStep(profile, {
+    engine: 'static-html',
+    phase: 'cascade',
+    ruleId: 'compute-styles',
+    target: filePath,
+  }, () => {
+    for (const child of root.children || []) {
+      if (child.type === 'tag') computeNode(child);
+    }
+  });
+}
+
+export {
+  BORDER_SHORTHAND_RE,
+  NAMED_COLORS,
+  normalizeColorForCheck,
+  buildBorderOverrideMap,
+  unwrapCssAtLayer,
+  STATIC_INHERITED_PROPS,
+  STATIC_DEFAULT_STYLE,
+  STATIC_PROP_MAP,
+  STATIC_NAMED_COLORS,
+  splitCssList,
+  splitCssTokens,
+  cssPropToCamel,
+  staticColorToCss,
+  parseStaticColor,
+  extractStaticColor,
+  normalizeStaticCssValue,
+  expandStaticBoxValues,
+  parseStaticBorder,
+  parseStaticFont,
+  parseStaticTransition,
+  parseStaticAnimation,
+  expandStaticDeclaration,
+  compareStaticPriority,
+  staticSpecificity,
+  applyStaticDeclaration,
+  parseStaticStyleAttribute,
+  collectStaticCssRules,
+  StaticElement,
+  StaticDocument,
+  makeStaticStyle,
+  buildStaticWindow,
+  collectStaticCssText,
+  buildStaticStyleMap,
+};
diff --git a/tools/design-detector/detector/engines/static-html/detect-html.mjs b/tools/design-detector/detector/engines/static-html/detect-html.mjs
new file mode 100644
index 0000000..7c6748e
--- /dev/null
+++ b/tools/design-detector/detector/engines/static-html/detect-html.mjs
@@ -0,0 +1,234 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+import { GENERIC_FONTS, OVERUSED_FONTS } from '../../shared/constants.mjs';
+import {
+  checkSourceDesignSystem,
+  collectStaticDesignSystemFindings,
+  mergeDesignSystemFindings,
+} from '../../design-system.mjs';
+import { isFullPage } from '../../shared/page.mjs';
+import { applyInlineIgnores } from '../../shared/inline-ignores.mjs';
+import { finding } from '../../findings.mjs';
+import { profileFindings, profileStep, profileStepAsync } from '../../profile/profiler.mjs';
+import {
+  checkElementBorders,
+  checkElementClippedOverflow,
+  checkElementColors,
+  checkElementGlow,
+  checkElementGptBorderShadow,
+  checkElementHeroEyebrow,
+  checkElementIconTile,
+  checkElementItalicSerif,
+  checkElementMotion,
+  checkElementOversizedH1,
+  checkElementQuality,
+  checkCreamPalette,
+  checkHtmlPatterns,
+  checkPageLayout,
+  checkPageQualityFromDoc,
+  checkRepeatedSectionKickersFromDoc,
+  resolveBackground,
+  resolveBorderRadiusPx,
+} from '../../rules/checks.mjs';
+import { filterByProviders } from '../../registry/antipatterns.mjs';
+import { detectText, runTextContentAnalyzers } from '../regex/detect-text.mjs';
+import {
+  StaticDocument,
+  buildStaticStyleMap,
+  buildStaticWindow,
+  collectStaticCssText,
+} from './css-cascade.mjs';
+
+function checkStaticPageTypography(document, window) {
+  const findings = [];
+  const fonts = new Set();
+  const overusedFound = new Set();
+  for (const el of document.querySelectorAll('p, h1, h2, h3, h4, h5, h6, li, td, th, dd, blockquote, figcaption, a, button, label, span, div')) {
+    const hasText = el.childNodes.some(n => n.nodeType === 3 && n.textContent.trim().length > 0);
+    if (!hasText) continue;
+    const ff = window.getComputedStyle(el).fontFamily || '';
+    const stack = ff.split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase());
+    const primary = stack.find(f => f && !GENERIC_FONTS.has(f));
+    if (!primary) continue;
+    fonts.add(primary);
+    if (OVERUSED_FONTS.has(primary)) overusedFound.add(primary);
+  }
+  for (const font of overusedFound) {
+    findings.push({ id: 'overused-font', snippet: `Primary font: ${font}` });
+  }
+  if (fonts.size === 1 && document.querySelectorAll('*').length >= 20) {
+    findings.push({ id: 'single-font', snippet: `only font used is ${[...fonts][0]}` });
+  }
+  const sizes = new Set();
+  for (const el of document.querySelectorAll('h1, h2, h3, h4, h5, h6, p, span, a, li, td, th, label, button, div')) {
+    const fontSize = parseFloat(window.getComputedStyle(el).fontSize);
+    if (fontSize >= 8 && fontSize < 200) sizes.add(Math.round(fontSize * 10) / 10);
+  }
+  if (sizes.size >= 3) {
+    const sorted = [...sizes].sort((a, b) => a - b);
+    const ratio = sorted[sorted.length - 1] / sorted[0];
+    if (ratio < 2.0) {
+      findings.push({ id: 'flat-type-hierarchy', snippet: `Sizes: ${sorted.map(s => s + 'px').join(', ')} (ratio ${ratio.toFixed(1)}:1)` });
+    }
+  }
+  return findings;
+}
+
+function checkElementBrokenImage(el) {
+  const src = (el.getAttribute && el.getAttribute('src')) ?? el.attribs?.src;
+  // Missing src attribute entirely
+  if (src === undefined || src === null) {
+    return [{ id: 'broken-image', snippet: '<img> with no src attribute' }];
+  }
+  const trimmed = String(src).trim();
+  // Empty or placeholder-only src values
+  if (trimmed === '' || trimmed === '#') {
+    return [{ id: 'broken-image', snippet: `<img src="${src}">` }];
+  }
+  return [];
+}
+
+const STATIC_ELEMENT_RULES = [
+  { id: 'border-rules', selector: '*', run: (el, tag, style, window, customPropMap) => checkElementBorders(tag, style, null, resolveBorderRadiusPx(el, style, parseFloat(style.width) || 0, window)) },
+  { id: 'color-rules', selector: '*', run: (el, tag, style, window, customPropMap) => checkElementColors(el, style, tag, window, customPropMap, false) },
+  { id: 'dark-glow', selector: '*', run: (el, tag, style, window, customPropMap) => checkElementGlow(tag, style, resolveBackground(el.parentElement || el, window, customPropMap)) },
+  { id: 'motion-rules', selector: '*', run: (el, tag, style) => checkElementMotion(tag, style) },
+  { id: 'icon-tile-stack', selector: 'h1,h2,h3,h4,h5,h6', run: (el, tag, _style, window) => checkElementIconTile(el, tag, window) },
+  { id: 'italic-serif-display', selector: 'h1,h2', run: (el, tag, style) => checkElementItalicSerif(el, style, tag) },
+  { id: 'hero-eyebrow-chip', selector: 'h1', run: (el, tag, style, window, customPropMap) => checkElementHeroEyebrow(el, style, tag, window, customPropMap) },
+  { id: 'broken-image', selector: 'img', run: (el) => checkElementBrokenImage(el) },
+  { id: 'quality-rules', selector: '*', run: (el, tag, style, window) => checkElementQuality(el, style, tag, window) },
+  { id: 'oversized-h1', selector: 'h1', run: (el, tag, style, window) => checkElementOversizedH1(el, style, tag, window) },
+  { id: 'clipped-overflow-container', selector: '*', run: (el, tag, style, window) => checkElementClippedOverflow(el, style, tag, window) },
+  { id: 'gpt-thin-border-wide-shadow', selector: '*', run: (el, tag, style) => checkElementGptBorderShadow(el, style) },
+];
+
+async function detectHtml(filePath, options = {}) {
+  const profile = options?.profile;
+  const html = profileStep(profile, {
+    engine: 'static-html',
+    phase: 'setup',
+    ruleId: 'read-html',
+    target: filePath,
+  }, () => fs.readFileSync(filePath, 'utf-8'));
+
+  let modules;
+  try {
+    modules = await profileStepAsync(profile, {
+      engine: 'static-html',
+      phase: 'setup',
+      ruleId: 'import-static-parser',
+      target: filePath,
+    }, async () => {
+      const [htmlparser2, cssSelect, csstree, domutils] = await Promise.all([
+        import('htmlparser2'),
+        import('css-select'),
+        import('css-tree'),
+        import('domutils'),
+      ]);
+      return {
+        parseDocument: htmlparser2.parseDocument,
+        selectAll: cssSelect.selectAll,
+        selectOne: cssSelect.selectOne,
+        is: cssSelect.is,
+        csstree,
+        domutils,
+      };
+    });
+  } catch {
+    return detectText(html, filePath, options);
+  }
+
+  const resolvedPath = path.resolve(filePath);
+  const fileDir = path.dirname(resolvedPath);
+  const root = profileStep(profile, {
+    engine: 'static-html',
+    phase: 'parse-html',
+    ruleId: 'parse-document',
+    target: filePath,
+  }, () => modules.parseDocument(html, { lowerCaseAttributeNames: false, lowerCaseTags: true }));
+
+  const cssText = collectStaticCssText(root, fileDir, profile, filePath, modules);
+  const document = new StaticDocument(root, modules);
+  buildStaticStyleMap(root, document, cssText, modules, profile, filePath);
+  const window = buildStaticWindow(document);
+
+  const customPropMap = null;
+
+  const findings = [];
+  const runElementCheck = (ruleId, callback) => profile
+    ? profileFindings(profile, { engine: 'static-html', phase: 'element', ruleId, target: filePath }, callback)
+    : callback();
+
+  const visitedByRule = new Map();
+  for (const rule of STATIC_ELEMENT_RULES) {
+    const elements = document.querySelectorAll(rule.selector);
+    visitedByRule.set(rule.id, elements.length);
+    for (const el of elements) {
+      const tag = el.tagName.toLowerCase();
+      const style = window.getComputedStyle(el);
+      for (const f of runElementCheck(rule.id, () => rule.run(el, tag, style, window, customPropMap))) {
+        findings.push(finding(f.id, filePath, f.snippet));
+      }
+    }
+  }
+
+  if (options?.designSystem) {
+    const sourceDesignFindings = profileFindings(profile, {
+      engine: 'static-html',
+      phase: 'source',
+      ruleId: 'design-system',
+      target: filePath,
+    }, () => checkSourceDesignSystem(html, filePath, { designSystem: options.designSystem }));
+    const staticDesignFindings = profileFindings(profile, {
+      engine: 'static-html',
+      phase: 'page',
+      ruleId: 'design-system',
+      target: filePath,
+    }, () => collectStaticDesignSystemFindings(document, window, filePath, options.designSystem));
+    findings.push(...mergeDesignSystemFindings(staticDesignFindings, sourceDesignFindings));
+  }
+
+  if (isFullPage(html)) {
+    const runPageCheck = (ruleId, callback) => profile
+      ? profileFindings(profile, { engine: 'static-html', phase: 'page', ruleId, target: filePath }, callback)
+      : callback();
+    for (const f of runPageCheck('typography-rules', () => checkStaticPageTypography(document, window))) {
+      findings.push(finding(f.id, filePath, f.snippet));
+    }
+    for (const f of runPageCheck('repeated-section-kickers', () => checkRepeatedSectionKickersFromDoc(document, window))) {
+      findings.push(finding(f.id, filePath, f.snippet));
+    }
+    for (const f of runPageCheck('layout-rules', () => checkPageLayout(document, window))) {
+      findings.push(finding(f.id, filePath, f.snippet));
+    }
+    for (const f of runPageCheck('cream-palette', () => checkCreamPalette(document, window))) {
+      findings.push(finding(f.id, filePath, f.snippet));
+    }
+    for (const f of runPageCheck('skipped-heading', () => checkPageQualityFromDoc(document))) {
+      findings.push(finding(f.id, filePath, f.snippet));
+    }
+    for (const f of runPageCheck('html-patterns', () => checkHtmlPatterns(html).filter(item =>
+      item.id !== 'bounce-easing' && item.id !== 'layout-transition'
+    ))) {
+      findings.push(finding(f.id, filePath, f.snippet));
+    }
+    // Text-content analyzers (em-dash overuse, marketing buzzwords,
+    // numbered section markers, aphoristic cadence) live in the regex
+    // engine. Call them from here so .html files get the same coverage
+    // as .css/.tsx files. These are scoped to text content only and
+    // don't overlap with static-html's element/page rules.
+    for (const f of runPageCheck('text-content', () => runTextContentAnalyzers(html, filePath, options))) {
+      findings.push(finding(f.antipattern, filePath, f.snippet));
+    }
+  }
+
+  const byProvider = filterByProviders(findings, options.providers);
+  // Static-HTML findings carry no line number, so only whole-file
+  // `impeccable-disable` directives apply here — exactly the standalone-document
+  // waiver this primitive targets. Bypassed by `--no-config` / `--no-inline-ignores`.
+  return options?.inlineIgnores === false ? byProvider : applyInlineIgnores(byProvider, html);
+}
+
+export { checkStaticPageTypography, STATIC_ELEMENT_RULES, detectHtml };
diff --git a/tools/design-detector/detector/engines/visual/screenshot-contrast.mjs b/tools/design-detector/detector/engines/visual/screenshot-contrast.mjs
new file mode 100644
index 0000000..c9668db
--- /dev/null
+++ b/tools/design-detector/detector/engines/visual/screenshot-contrast.mjs
@@ -0,0 +1,189 @@
+function sanitizeScreenshotClip(clip, viewport) {
+  if (!clip) return null;
+  const x = Math.max(0, Math.floor(clip.x || 0));
+  const y = Math.max(0, Math.floor(clip.y || 0));
+  const width = Math.min(
+    Math.max(1, Math.ceil(clip.width || 0)),
+    Math.max(1, viewport?.width || 1600),
+  );
+  const height = Math.min(
+    Math.max(1, Math.ceil(clip.height || 0)),
+    320,
+  );
+  if (width < 1 || height < 1) return null;
+  return { x, y, width, height };
+}
+
+async function compareScreenshotContrast(page, beforeBase64, afterBase64, candidate) {
+  return page.evaluate(async ({ beforeBase64, afterBase64, candidate }) => {
+    const loadImage = (base64) => new Promise((resolve, reject) => {
+      const img = new Image();
+      img.onload = () => resolve(img);
+      img.onerror = () => reject(new Error('Could not decode contrast screenshot'));
+      img.src = `data:image/png;base64,${base64}`;
+    });
+    const [before, after] = await Promise.all([loadImage(beforeBase64), loadImage(afterBase64)]);
+    const width = Math.min(before.width, after.width);
+    const height = Math.min(before.height, after.height);
+    if (width < 1 || height < 1) return null;
+
+    const canvas = document.createElement('canvas');
+    canvas.width = width;
+    canvas.height = height;
+    const ctx = canvas.getContext('2d', { willReadFrequently: true });
+    if (!ctx) return null;
+
+    ctx.drawImage(before, 0, 0, width, height);
+    const beforePixels = ctx.getImageData(0, 0, width, height).data;
+    ctx.clearRect(0, 0, width, height);
+    ctx.drawImage(after, 0, 0, width, height);
+    const afterPixels = ctx.getImageData(0, 0, width, height).data;
+
+    const luminance = ({ r, g, b }) => {
+      const convert = c => {
+        const v = c / 255;
+        return v <= 0.03928 ? v / 12.92 : ((v + 0.055) / 1.055) ** 2.4;
+      };
+      return 0.2126 * convert(r) + 0.7152 * convert(g) + 0.0722 * convert(b);
+    };
+    const ratio = (a, b) => {
+      const l1 = luminance(a);
+      const l2 = luminance(b);
+      return (Math.max(l1, l2) + 0.05) / (Math.min(l1, l2) + 0.05);
+    };
+
+    const cssTextColor = candidate.textColor && !candidate.preferRenderedForeground
+      ? {
+          r: candidate.textColor.r,
+          g: candidate.textColor.g,
+          b: candidate.textColor.b,
+        }
+      : null;
+    const ratios = [];
+    let glyphPixels = 0;
+    let strongestDelta = 0;
+    for (let i = 0; i < beforePixels.length; i += 4) {
+      const delta = Math.abs(beforePixels[i] - afterPixels[i])
+        + Math.abs(beforePixels[i + 1] - afterPixels[i + 1])
+        + Math.abs(beforePixels[i + 2] - afterPixels[i + 2])
+        + Math.abs(beforePixels[i + 3] - afterPixels[i + 3]);
+      strongestDelta = Math.max(strongestDelta, delta);
+      if (delta < 10) continue;
+      glyphPixels++;
+      const fg = cssTextColor || {
+        r: beforePixels[i],
+        g: beforePixels[i + 1],
+        b: beforePixels[i + 2],
+      };
+      const bg = {
+        r: afterPixels[i],
+        g: afterPixels[i + 1],
+        b: afterPixels[i + 2],
+      };
+      ratios.push(ratio(fg, bg));
+    }
+
+    if (ratios.length < 8) {
+      return {
+        glyphPixels,
+        strongestDelta,
+        worstRatio: null,
+        p10Ratio: null,
+        medianRatio: null,
+      };
+    }
+
+    ratios.sort((a, b) => a - b);
+    const pick = pct => ratios[Math.min(ratios.length - 1, Math.max(0, Math.floor((pct / 100) * ratios.length)))];
+    return {
+      glyphPixels,
+      strongestDelta,
+      worstRatio: ratios[0],
+      p10Ratio: pick(10),
+      medianRatio: pick(50),
+    };
+  }, { beforeBase64, afterBase64, candidate });
+}
+
+async function captureVisualContrastCandidate(page, candidate, viewport) {
+  const clip = sanitizeScreenshotClip(candidate.clip, viewport);
+  if (!clip) return null;
+
+  const beforeBase64 = await page.screenshot({
+    encoding: 'base64',
+    clip,
+    captureBeyondViewport: true,
+  });
+  const token = `impeccable-contrast-${Date.now()}-${Math.random().toString(36).slice(2)}`;
+  const applied = await page.evaluate(({ selector, token, backgroundClipText }) => {
+    let el;
+    try {
+      el = document.querySelector(selector);
+    } catch {
+      return false;
+    }
+    if (!el) return false;
+    let style = document.getElementById('impeccable-visual-contrast-hide-style');
+    if (!style) {
+      style = document.createElement('style');
+      style.id = 'impeccable-visual-contrast-hide-style';
+      style.textContent = [
+        '[data-impeccable-visual-contrast-target] {',
+        '  color: transparent !important;',
+        '  -webkit-text-fill-color: transparent !important;',
+        '  text-shadow: none !important;',
+        '}',
+        '[data-impeccable-visual-contrast-target][data-impeccable-bgclip-text="true"] {',
+        '  background-image: none !important;',
+        '}',
+      ].join('\n');
+      document.head.appendChild(style);
+    }
+    el.setAttribute('data-impeccable-visual-contrast-target', token);
+    if (backgroundClipText) el.setAttribute('data-impeccable-bgclip-text', 'true');
+    return true;
+  }, {
+    selector: candidate.selector,
+    token,
+    backgroundClipText: candidate.backgroundClipText,
+  });
+  if (!applied) return null;
+
+  let afterBase64;
+  try {
+    afterBase64 = await page.screenshot({
+      encoding: 'base64',
+      clip,
+      captureBeyondViewport: true,
+    });
+  } finally {
+    await page.evaluate(({ selector }) => {
+      try {
+        const el = document.querySelector(selector);
+        if (el) {
+          el.removeAttribute('data-impeccable-visual-contrast-target');
+          el.removeAttribute('data-impeccable-bgclip-text');
+        }
+      } catch {
+        // Ignore invalid or stale selectors during cleanup.
+      }
+    }, { selector: candidate.selector }).catch(() => {});
+  }
+
+  const metrics = await compareScreenshotContrast(page, beforeBase64, afterBase64, candidate);
+  if (!metrics || !Number.isFinite(metrics.p10Ratio) || metrics.glyphPixels < 8) return null;
+  const measuredRatio = metrics.p10Ratio;
+  if (measuredRatio >= candidate.threshold) return null;
+  const textLabel = candidate.text ? ` "${candidate.text}"` : '';
+  const reasonLabel = (candidate.reasons || []).slice(0, 3).join(', ') || 'visual background';
+  return {
+    id: 'low-contrast',
+    snippet: `pixel contrast ${measuredRatio.toFixed(1)}:1 median ${metrics.medianRatio.toFixed(1)}:1 (need ${candidate.threshold}:1) on ${reasonLabel}${textLabel}`,
+  };
+}
+
+export {
+  sanitizeScreenshotClip,
+  compareScreenshotContrast,
+  captureVisualContrastCandidate,
+};
diff --git a/tools/design-detector/detector/findings.mjs b/tools/design-detector/detector/findings.mjs
new file mode 100644
index 0000000..5a30b4f
--- /dev/null
+++ b/tools/design-detector/detector/findings.mjs
@@ -0,0 +1,12 @@
+import { getAntipattern } from './registry/antipatterns.mjs';
+
+function getAP(id) {
+  return getAntipattern(id);
+}
+
+function finding(id, filePath, snippet, line = 0) {
+  const ap = getAP(id);
+  return { antipattern: id, name: ap.name, description: ap.description, severity: ap.severity || 'warning', file: filePath, line, snippet };
+}
+
+export { getAP, finding };
diff --git a/tools/design-detector/detector/node/file-system.mjs b/tools/design-detector/detector/node/file-system.mjs
new file mode 100644
index 0000000..aaa8c6d
--- /dev/null
+++ b/tools/design-detector/detector/node/file-system.mjs
@@ -0,0 +1,198 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+// ---------------------------------------------------------------------------
+// File walker
+// ---------------------------------------------------------------------------
+
+const SKIP_DIRS = new Set([
+  'node_modules', '.git', 'dist', 'build', '.next', '.nuxt', '.output',
+  '.svelte-kit', '__pycache__', '.turbo', '.vercel',
+]);
+
+const SCANNABLE_EXTENSIONS = new Set([
+  '.html', '.htm', '.css', '.scss', '.sass', '.less',
+  '.jsx', '.tsx', '.js', '.ts',
+  '.vue', '.svelte', '.astro',
+]);
+
+const HTML_EXTENSIONS = new Set(['.html', '.htm']);
+
+function walkDir(dir) {
+  const files = [];
+  let entries;
+  try { entries = fs.readdirSync(dir, { withFileTypes: true }); } catch { return files; }
+  for (const entry of entries) {
+    if (SKIP_DIRS.has(entry.name)) continue;
+    const full = path.join(dir, entry.name);
+    if (entry.isDirectory()) files.push(...walkDir(full));
+    else if (SCANNABLE_EXTENSIONS.has(path.extname(entry.name).toLowerCase())) files.push(full);
+  }
+  return files;
+}
+
+
+// ---------------------------------------------------------------------------
+// Import graph (multi-file awareness)
+// ---------------------------------------------------------------------------
+
+function resolveImport(specifier, fromDir, fileSet) {
+  if (!/^[./]/.test(specifier)) return null; // skip bare specifiers
+  const base = path.resolve(fromDir, specifier);
+  if (fileSet.has(base)) return base;
+  for (const ext of SCANNABLE_EXTENSIONS) {
+    const withExt = base + ext;
+    if (fileSet.has(withExt)) return withExt;
+  }
+  // index file convention
+  for (const ext of SCANNABLE_EXTENSIONS) {
+    const indexFile = path.join(base, 'index' + ext);
+    if (fileSet.has(indexFile)) return indexFile;
+  }
+  return null;
+}
+
+function buildImportGraph(files) {
+  const fileSet = new Set(files);
+  const graph = new Map();
+
+  for (const file of files) {
+    const content = fs.readFileSync(file, 'utf-8');
+    const dir = path.dirname(file);
+    const imports = new Set();
+
+    // ES imports: import ... from '...' and import '...'
+    const esRe = /import\s+(?:[\s\S]*?from\s+)?['"]([^'"]+)['"]/g;
+    let m;
+    while ((m = esRe.exec(content)) !== null) {
+      const resolved = resolveImport(m[1], dir, fileSet);
+      if (resolved) imports.add(resolved);
+    }
+
+    // CSS @import
+    const cssRe = /@import\s+(?:url\(\s*)?['"]?([^'");\s]+)['"]?\s*\)?/g;
+    while ((m = cssRe.exec(content)) !== null) {
+      const resolved = resolveImport(m[1], dir, fileSet);
+      if (resolved) imports.add(resolved);
+    }
+
+    // SCSS @use / @forward
+    const scssRe = /@(?:use|forward)\s+['"]([^'"]+)['"]/g;
+    while ((m = scssRe.exec(content)) !== null) {
+      const resolved = resolveImport(m[1], dir, fileSet);
+      if (resolved) imports.add(resolved);
+    }
+
+    graph.set(file, imports);
+  }
+  return graph;
+}
+
+// ---------------------------------------------------------------------------
+// Framework dev server detection
+// ---------------------------------------------------------------------------
+
+const FRAMEWORK_CONFIGS = [
+  { name: 'Next.js', files: ['next.config.js', 'next.config.mjs', 'next.config.ts'], defaultPort: 3000,
+    portRe: /port\s*[:=]\s*(\d+)/,
+    fingerprint: { header: 'x-powered-by', value: /next/i } },
+  { name: 'SvelteKit', files: ['svelte.config.js', 'svelte.config.ts'], defaultPort: 5173,
+    portRe: /port\s*[:=]\s*(\d+)/,
+    fingerprint: { header: 'x-sveltekit-page', value: null } },
+  { name: 'Nuxt', files: ['nuxt.config.js', 'nuxt.config.ts'], defaultPort: 3000,
+    portRe: /port\s*[:=]\s*(\d+)/,
+    fingerprint: { header: 'x-powered-by', value: /nuxt/i } },
+  { name: 'Vite', files: ['vite.config.js', 'vite.config.ts', 'vite.config.mjs'], defaultPort: 5173,
+    portRe: /port\s*[:=]\s*(\d+)/,
+    fingerprint: { body: /@vite\/client/ } },
+  { name: 'Astro', files: ['astro.config.js', 'astro.config.ts', 'astro.config.mjs'], defaultPort: 4321,
+    portRe: /port\s*[:=]\s*(\d+)/,
+    fingerprint: { body: /astro/i } },
+  { name: 'Angular', files: ['angular.json'], defaultPort: 4200,
+    portRe: /"port"\s*:\s*(\d+)/,
+    fingerprint: { body: /ng-version/i } },
+  { name: 'Remix', files: ['remix.config.js', 'remix.config.ts'], defaultPort: 3000,
+    portRe: /port\s*[:=]\s*(\d+)/,
+    fingerprint: { header: 'x-powered-by', value: /remix/i } },
+];
+
+function detectFrameworkConfig(dir) {
+  let entries;
+  try { entries = fs.readdirSync(dir); } catch { return null; }
+  const entrySet = new Set(entries);
+
+  for (const cfg of FRAMEWORK_CONFIGS) {
+    const match = cfg.files.find(f => entrySet.has(f));
+    if (!match) continue;
+
+    const configPath = path.join(dir, match);
+    let port = cfg.defaultPort;
+    try {
+      const content = fs.readFileSync(configPath, 'utf-8');
+      const portMatch = content.match(cfg.portRe);
+      if (portMatch) port = parseInt(portMatch[1], 10);
+    } catch { /* use default */ }
+
+    return { name: cfg.name, port, configPath, fingerprint: cfg.fingerprint };
+  }
+  return null;
+}
+
+/**
+ * Check if a port is listening and optionally verify it matches the expected framework.
+ * Returns { listening: true, matched: true/false } or { listening: false }.
+ */
+async function isPortListening(port, fingerprint = null) {
+  if (!fingerprint) {
+    // Simple TCP probe fallback
+    const net = await import('node:net');
+    return new Promise((resolve) => {
+      const sock = net.default.createConnection({ port, host: '127.0.0.1' });
+      sock.setTimeout(500);
+      sock.on('connect', () => { sock.destroy(); resolve({ listening: true, matched: true }); });
+      sock.on('error', () => resolve({ listening: false }));
+      sock.on('timeout', () => { sock.destroy(); resolve({ listening: false }); });
+    });
+  }
+
+  // HTTP probe with fingerprint matching
+  try {
+    const controller = new AbortController();
+    const timeout = setTimeout(() => controller.abort(), 2000);
+    const res = await fetch(`http://localhost:${port}/`, { signal: controller.signal, redirect: 'follow' });
+    clearTimeout(timeout);
+
+    // Check header fingerprint
+    if (fingerprint.header) {
+      const val = res.headers.get(fingerprint.header);
+      if (val && (!fingerprint.value || fingerprint.value.test(val))) {
+        return { listening: true, matched: true };
+      }
+    }
+
+    // Check body fingerprint
+    if (fingerprint.body) {
+      const body = await res.text();
+      if (fingerprint.body.test(body)) {
+        return { listening: true, matched: true };
+      }
+    }
+
+    // Port is listening but doesn't match the expected framework
+    return { listening: true, matched: false };
+  } catch {
+    return { listening: false };
+  }
+}
+
+export {
+  SKIP_DIRS,
+  SCANNABLE_EXTENSIONS,
+  HTML_EXTENSIONS,
+  walkDir,
+  resolveImport,
+  buildImportGraph,
+  FRAMEWORK_CONFIGS,
+  detectFrameworkConfig,
+  isPortListening,
+};
diff --git a/tools/design-detector/detector/profile/profiler.mjs b/tools/design-detector/detector/profile/profiler.mjs
new file mode 100644
index 0000000..b05fbf3
--- /dev/null
+++ b/tools/design-detector/detector/profile/profiler.mjs
@@ -0,0 +1,166 @@
+function profileNow() {
+  return typeof performance !== 'undefined' && performance.now
+    ? performance.now()
+    : Date.now();
+}
+
+function createDetectorProfile() {
+  return { events: [] };
+}
+
+function recordProfileEvent(profile, event) {
+  if (!profile) return;
+  const normalized = {
+    engine: event.engine || 'unknown',
+    phase: event.phase || 'unknown',
+    ruleId: event.ruleId || 'unknown',
+    target: event.target || '',
+    ms: Number.isFinite(event.ms) ? event.ms : 0,
+    findings: Number.isFinite(event.findings) ? event.findings : 0,
+  };
+  if (event.detail) normalized.detail = event.detail;
+  if (Array.isArray(event.findingIds) && event.findingIds.length) {
+    normalized.findingIds = event.findingIds;
+  }
+  if (typeof profile === 'function') {
+    profile(normalized);
+  } else if (typeof profile.record === 'function') {
+    profile.record(normalized);
+  } else if (Array.isArray(profile.events)) {
+    profile.events.push(normalized);
+  } else if (Array.isArray(profile)) {
+    profile.push(normalized);
+  }
+}
+
+function extractFindingIds(findings) {
+  if (!Array.isArray(findings) || findings.length === 0) return [];
+  return [...new Set(findings.map(f => f?.id || f?.type || f?.antipattern).filter(Boolean))];
+}
+
+function profileFindings(profile, meta, callback) {
+  if (!profile) return callback();
+  const started = profileNow();
+  const findings = callback();
+  recordProfileEvent(profile, {
+    ...meta,
+    ms: profileNow() - started,
+    findings: Array.isArray(findings) ? findings.length : 0,
+    findingIds: extractFindingIds(findings),
+  });
+  return findings;
+}
+
+function profileStep(profile, meta, callback) {
+  if (!profile) return callback();
+  const started = profileNow();
+  try {
+    return callback();
+  } finally {
+    recordProfileEvent(profile, {
+      ...meta,
+      ms: profileNow() - started,
+      findings: 0,
+    });
+  }
+}
+
+async function profileFindingsAsync(profile, meta, callback) {
+  if (!profile) return callback();
+  const started = profileNow();
+  const findings = await callback();
+  recordProfileEvent(profile, {
+    ...meta,
+    ms: profileNow() - started,
+    findings: Array.isArray(findings) ? findings.length : 0,
+    findingIds: extractFindingIds(findings),
+  });
+  return findings;
+}
+
+async function profileStepAsync(profile, meta, callback) {
+  if (!profile) return callback();
+  const started = profileNow();
+  try {
+    return await callback();
+  } finally {
+    recordProfileEvent(profile, {
+      ...meta,
+      ms: profileNow() - started,
+      findings: 0,
+    });
+  }
+}
+
+function percentile(sortedValues, pct) {
+  if (!sortedValues.length) return 0;
+  const idx = Math.min(
+    sortedValues.length - 1,
+    Math.max(0, Math.ceil((pct / 100) * sortedValues.length) - 1),
+  );
+  return sortedValues[idx];
+}
+
+function summarizeDetectorProfile(profile) {
+  const events = Array.isArray(profile)
+    ? profile
+    : (Array.isArray(profile?.events) ? profile.events : []);
+  const groups = new Map();
+  for (const event of events) {
+    const key = [
+      event.engine || 'unknown',
+      event.phase || 'unknown',
+      event.ruleId || 'unknown',
+      event.target || '',
+    ].join('\u0000');
+    let group = groups.get(key);
+    if (!group) {
+      group = {
+        engine: event.engine || 'unknown',
+        phase: event.phase || 'unknown',
+        ruleId: event.ruleId || 'unknown',
+        target: event.target || '',
+        calls: 0,
+        totalMs: 0,
+        findings: 0,
+        samples: [],
+      };
+      groups.set(key, group);
+    }
+    const ms = Number.isFinite(event.ms) ? event.ms : 0;
+    group.calls += 1;
+    group.totalMs += ms;
+    group.findings += Number.isFinite(event.findings) ? event.findings : 0;
+    group.samples.push(ms);
+  }
+  return [...groups.values()]
+    .map(group => {
+      const samples = group.samples.sort((a, b) => a - b);
+      return {
+        engine: group.engine,
+        phase: group.phase,
+        ruleId: group.ruleId,
+        target: group.target,
+        calls: group.calls,
+        totalMs: Number(group.totalMs.toFixed(3)),
+        avgMs: Number((group.totalMs / group.calls).toFixed(3)),
+        p50: Number(percentile(samples, 50).toFixed(3)),
+        p95: Number(percentile(samples, 95).toFixed(3)),
+        findings: group.findings,
+      };
+    })
+    .sort((a, b) => b.totalMs - a.totalMs);
+}
+
+export {
+  profileNow,
+  createDetectorProfile,
+  recordProfileEvent,
+  extractFindingIds,
+  profileFindings,
+  profileStep,
+  profileFindingsAsync,
+  profileStepAsync,
+  percentile,
+  summarizeDetectorProfile,
+};
diff --git a/tools/design-detector/detector/registry/antipatterns.mjs b/tools/design-detector/detector/registry/antipatterns.mjs
new file mode 100644
index 0000000..99eb2da
--- /dev/null
+++ b/tools/design-detector/detector/registry/antipatterns.mjs
@@ -0,0 +1,448 @@
+const ANTIPATTERNS = [
+  // ── AI slop: tells that something was AI-generated ──
+  {
+    id: 'side-tab',
+    category: 'slop',
+    name: 'Side-tab accent border',
+    description:
+      'Thick colored border on one side of a card — the most recognizable tell of AI-generated UIs. Use a subtler accent or remove it entirely.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'colored accent stripe',
+  },
+  {
+    id: 'border-accent-on-rounded',
+    category: 'slop',
+    name: 'Border accent on rounded element',
+    description:
+      'Thick accent border on a rounded card — the border clashes with the rounded corners. Remove the border or the border-radius.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'colored accent stripe',
+  },
+  {
+    id: 'overused-font',
+    category: 'slop',
+    name: 'Overused font',
+    description:
+      'Inter, Roboto, Fraunces, Geist, Plus Jakarta Sans, and Space Grotesk are used on so many sites they no longer feel distinctive. Each new wave of AI-generated UIs converges on the same handful of faces. Choose a face that gives your interface personality.',
+    skillSection: 'Typography',
+    skillGuideline: 'overused fonts like Inter',
+  },
+  {
+    id: 'single-font',
+    category: 'slop',
+    name: 'Single font for everything',
+    description:
+      'Only one font family is used for the entire page. Pair a distinctive display font with a refined body font to create typographic hierarchy.',
+    skillSection: 'Typography',
+    skillGuideline: 'only one font family for the entire page',
+  },
+  {
+    id: 'flat-type-hierarchy',
+    category: 'slop',
+    name: 'Flat type hierarchy',
+    description:
+      'Font sizes are too close together — no clear visual hierarchy. Use fewer sizes with more contrast (aim for at least a 1.25 ratio between steps).',
+    skillSection: 'Typography',
+    skillGuideline: 'flat type hierarchy',
+  },
+  {
+    id: 'gradient-text',
+    category: 'slop',
+    name: 'Gradient text',
+    description:
+      'Gradient text is decorative rather than meaningful — a common AI tell, especially on headings and metrics. Use solid colors for text.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'gradient text for',
+  },
+  {
+    id: 'ai-color-palette',
+    category: 'slop',
+    name: 'AI color palette',
+    description:
+      'Purple/violet gradients and cyan-on-dark are the most recognizable tells of AI-generated UIs. Choose a distinctive, intentional palette.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'AI color palette',
+  },
+  {
+    id: 'cream-palette',
+    category: 'slop',
+    name: 'Cream / beige palette',
+    description:
+      'A warm cream or beige page background has become the default "tasteful" AI surface, reached for by reflex. Choose a background that comes from a deliberate palette, not the safe warm off-white.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'cream and beige as the default surface',
+  },
+  {
+    id: 'nested-cards',
+    category: 'slop',
+    name: 'Nested cards',
+    description:
+      'Cards inside cards create visual noise and excessive depth. Flatten the hierarchy — use spacing, typography, and dividers instead of nesting containers.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'Nest cards inside cards',
+  },
+  {
+    id: 'monotonous-spacing',
+    category: 'slop',
+    name: 'Monotonous spacing',
+    description:
+      'The same spacing value used everywhere — no rhythm, no variation. Use tight groupings for related items and generous separations between sections.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'same spacing everywhere',
+  },
+  {
+    id: 'bounce-easing',
+    category: 'slop',
+    name: 'Bounce or elastic easing',
+    description:
+      'Bounce and elastic easing feel dated and tacky. Real objects decelerate smoothly — use exponential easing (ease-out-quart/quint/expo) instead.',
+    skillSection: 'Motion',
+    skillGuideline: 'bounce or elastic easing',
+  },
+  {
+    id: 'dark-glow',
+    category: 'slop',
+    name: 'Dark mode with glowing accents',
+    description:
+      'Dark backgrounds with colored box-shadow glows are the default "cool" look of AI-generated UIs. Use subtle, purposeful lighting instead — or skip the dark theme entirely.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'dark mode with glowing accents',
+  },
+  {
+    id: 'icon-tile-stack',
+    category: 'slop',
+    name: 'Icon tile stacked above heading',
+    description:
+      'A small rounded-square icon container above a heading is the universal AI feature-card template — every generator outputs this exact shape. Try a side-by-side icon and heading, or let the icon sit in flow without its own container.',
+    skillSection: 'Typography',
+    skillGuideline: 'large icons with rounded corners above every heading',
+  },
+  {
+    id: 'italic-serif-display',
+    category: 'slop',
+    name: 'Italic serif display headline',
+    description:
+      'Oversized italic serif (Fraunces, Recoleta, Playfair, Newsreader-italic) as the primary hero headline reads as taste in isolation but has become the universal AI-startup landing page hero. Set roman, or move to a non-serif display face. Editorial / magazine register may legitimately want this — judge by context.',
+    skillSection: 'Typography',
+    skillGuideline: 'oversized italic serif as the hero headline',
+  },
+  {
+    id: 'hero-eyebrow-chip',
+    category: 'slop',
+    name: 'Hero eyebrow / pill chip',
+    description:
+      'A tiny uppercase letter-spaced label sitting immediately above an oversized hero headline — or the same shape rendered as a pill chip — is now the default AI SaaS hero. Drop the eyebrow, integrate the kicker into the headline, or run it as a navigation breadcrumb instead.',
+    skillSection: 'Typography',
+    skillGuideline: 'tiny uppercase tracked label above the hero headline',
+  },
+  {
+    id: 'repeated-section-kickers',
+    category: 'slop',
+    severity: 'advisory',
+    name: 'Repeated section kicker labels',
+    description:
+      'Repeating tiny uppercase tracked labels above section headings turns a brand page into AI editorial scaffolding. Replace them with stronger structure, artifacts, imagery, or a deliberate brand system.',
+    skillSection: 'Typography',
+    skillGuideline: 'repeated eyebrow or kicker labels as section scaffolding',
+  },
+  {
+    id: 'numbered-section-markers',
+    category: 'slop',
+    severity: 'advisory',
+    name: 'Numbered section markers (01 / 02 / 03)',
+    description:
+      'Numbered display markers as section labels (01, 02, 03) are the AI editorial scaffold one tier deeper than tracked eyebrow chips. If you find yourself reaching for them, choose a different section cadence.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'numbered section markers',
+  },
+  {
+    id: 'em-dash-overuse',
+    category: 'slop',
+    name: 'Em-dash overuse',
+    description:
+      'More than two em-dashes (— or --) in body copy is an AI cadence tell. Use commas, colons, periods, or parentheses instead.',
+    skillSection: 'Copy',
+    skillGuideline: 'no em dashes',
+  },
+  {
+    id: 'marketing-buzzword',
+    category: 'slop',
+    name: 'Marketing buzzword',
+    description:
+      'Generic SaaS phrases (streamline / empower / supercharge / world-class / enterprise-grade / next-generation / cutting-edge / etc) are instant AI tells. Pick a specific verb and noun that says what the product literally does.',
+    skillSection: 'Copy',
+    skillGuideline: 'marketing buzzwords',
+  },
+  {
+    id: 'aphoristic-cadence',
+    category: 'slop',
+    name: 'Aphoristic-cadence copy',
+    description:
+      'Three or more sections landing on a short rebuttal sentence ("X. No Y." / "X. Just Y.") or a manufactured-contrast aphorism ("Not a feature. A platform.") reads as AI cadence, not voice. Once is fine; the pattern is the tell.',
+    skillSection: 'Copy',
+    skillGuideline: 'aphoristic cadence',
+  },
+  {
+    id: 'oversized-h1',
+    category: 'slop',
+    name: 'Oversized hero headline',
+    description:
+      'A full-sentence headline set at display size ends up dominating the viewport, leaving no room for anything else above the fold. A punchy one- or two-word headline at that size is fine — the problem is a long headline blown up too large. Set long headlines smaller, or tighten the copy.',
+    skillSection: 'Typography',
+    skillGuideline: 'long headline set at display size',
+  },
+  {
+    id: 'extreme-negative-tracking',
+    category: 'slop',
+    name: 'Crushed letter spacing',
+    description:
+      'Letter-spacing pulled tighter than the point where characters keep their own shapes costs legibility. Tighten display type optically, not destructively.',
+    skillSection: 'Typography',
+    skillGuideline: 'letter spacing crushed past legibility',
+  },
+  {
+    id: 'broken-image',
+    category: 'quality',
+    name: 'Broken or placeholder image',
+    description:
+      '<img> tags with empty src, missing src, or placeholder values ship as broken-image boxes. Use real images, generated assets, or remove the tag.',
+    skillSection: 'Imagery',
+    skillGuideline: 'broken image references',
+  },
+
+  // ── Quality: general design and accessibility issues ──
+  {
+    id: 'gray-on-color',
+    category: 'quality',
+    name: 'Gray text on colored background',
+    description:
+      'Gray text looks washed out on colored backgrounds. Use a darker shade of the background color instead, or white/near-white for contrast.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'gray text on colored backgrounds',
+  },
+  {
+    id: 'low-contrast',
+    category: 'quality',
+    name: 'Low contrast text',
+    description:
+      'Text does not meet WCAG AA contrast requirements (4.5:1 for body, 3:1 for large text). Increase the contrast between text and background.',
+  },
+  {
+    id: 'layout-transition',
+    category: 'quality',
+    name: 'Layout property animation',
+    description:
+      'Animating width, height, padding, or margin causes layout thrash and janky performance. Use transform and opacity instead, or grid-template-rows for height animations.',
+    skillSection: 'Motion',
+    skillGuideline: 'Animate layout properties',
+  },
+  {
+    id: 'line-length',
+    category: 'quality',
+    name: 'Line length too long',
+    description:
+      'Text lines wider than ~80 characters are hard to read. The eye loses its place tracking back to the start of the next line. Add a max-width (65ch to 75ch) to text containers.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'wrap beyond ~80 characters',
+  },
+  {
+    id: 'cramped-padding',
+    category: 'quality',
+    name: 'Cramped padding',
+    description:
+      'Text is too close to the edge of its container. Two shapes: (1) an element with its own text where the padding is too low for the font size, and (2) a wrapper with text-bearing children and near-zero padding against a visible boundary (border, outline, or non-transparent background) — children land flush against the boundary line. Add at least 8px (ideally 12–16px) of padding inside bordered, outlined, or colored containers.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'inside bordered or colored containers',
+  },
+  {
+    id: 'body-text-viewport-edge',
+    category: 'quality',
+    name: 'Body text touching viewport edge',
+    description:
+      'Body paragraphs render flush against the left or right viewport edge with no container providing horizontal padding. Wrap content in a container with at least 16px (ideally 24-32px) of horizontal padding, or apply max-width with mx-auto.',
+  },
+  {
+    id: 'tight-leading',
+    category: 'quality',
+    name: 'Tight line height',
+    description:
+      'Line height below 1.3x the font size makes multi-line text hard to read. Use 1.5 to 1.7 for body text so lines have room to breathe.',
+  },
+  {
+    id: 'skipped-heading',
+    category: 'quality',
+    name: 'Skipped heading level',
+    description:
+      'Heading levels should not skip (e.g. h1 then h3 with no h2). Screen readers use heading hierarchy for navigation. Skipping levels breaks the document outline.',
+  },
+  {
+    id: 'justified-text',
+    category: 'quality',
+    name: 'Justified text',
+    description:
+      'Justified text without hyphenation creates uneven word spacing ("rivers of white"). Use text-align: left for body text, or enable hyphens: auto if you must justify.',
+  },
+  {
+    id: 'tiny-text',
+    category: 'quality',
+    name: 'Tiny body text',
+    description:
+      'Body text below 12px is hard to read, especially on high-DPI screens. Use at least 14px for body content, 16px is ideal.',
+  },
+  {
+    id: 'all-caps-body',
+    category: 'quality',
+    name: 'All-caps body text',
+    description:
+      'Long passages in uppercase are hard to read. We recognize words by shape (ascenders and descenders), which all-caps removes. Reserve uppercase for short labels and headings.',
+    skillSection: 'Typography',
+    skillGuideline: 'long body passages in uppercase',
+  },
+  {
+    id: 'wide-tracking',
+    category: 'quality',
+    name: 'Wide letter spacing on body text',
+    description:
+      'Letter spacing above 0.05em on body text disrupts natural character groupings and slows reading. Reserve wide tracking for short uppercase labels only.',
+  },
+  {
+    id: 'text-overflow',
+    category: 'quality',
+    name: 'Content overflowing its container',
+    description:
+      'Content renders wider than its container, spilling out or forcing a horizontal scrollbar. Let text wrap, constrain widths, or give the region a deliberate scroll affordance.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'content wider than its container',
+  },
+  {
+    id: 'clipped-overflow-container',
+    category: 'quality',
+    name: 'Positioned child clipped by overflow container',
+    description:
+      'A clipping container (overflow hidden or clip) wrapping an absolutely-positioned child cuts off tooltips, menus, and popovers that need to escape. Let the overflow be visible, or move the positioned layer out of the clip.',
+    skillSection: 'Layout & Space',
+    skillGuideline: 'overflow container clipping positioned children',
+  },
+  {
+    id: 'design-system-font',
+    category: 'quality',
+    name: 'Font outside DESIGN.md',
+    description:
+      'A font is used that is not declared in DESIGN.md typography. Use the documented type system or update DESIGN.md if this is an intentional brand addition.',
+    skillSection: 'Typography',
+    skillGuideline: 'font family outside the project design system',
+  },
+  {
+    id: 'design-system-color',
+    category: 'quality',
+    severity: 'advisory',
+    name: 'Color outside DESIGN.md',
+    description:
+      'A literal color is outside the DESIGN.md palette and sidecar tonal ramps. This may be legitimate, but it should be an intentional design-system addition rather than drift.',
+    skillSection: 'Color & Contrast',
+    skillGuideline: 'literal color outside the project design system',
+  },
+  {
+    id: 'design-system-radius',
+    category: 'quality',
+    severity: 'advisory',
+    name: 'Radius outside DESIGN.md',
+    description:
+      'A border-radius value is outside the DESIGN.md rounded scale. Use a documented radius token or update the design system if the new shape is intentional.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'border radius outside the project design system',
+  },
+
+  // ── Provider tells: opt-in via --gpt / --gemini (gated off by default) ──
+  {
+    id: 'gpt-thin-border-wide-shadow',
+    category: 'slop',
+    severity: 'advisory',
+    gated: 'gpt',
+    name: 'Hairline border with wide shadow',
+    description:
+      'A hairline border paired with a wide, diffuse shadow is a recurring generated-UI signature. Commit to one — a defined edge or a soft elevation — rather than both at once.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'hairline border plus wide diffuse shadow',
+  },
+  {
+    id: 'repeating-stripes-gradient',
+    category: 'slop',
+    severity: 'advisory',
+    gated: 'gpt',
+    name: 'Repeating-gradient stripes',
+    description:
+      'Repeating-gradient stripes used as surface decoration are a recurring generated-UI signature. Reach for a deliberate texture or leave the surface plain.',
+    skillSection: 'Visual Details',
+    skillGuideline: 'repeating-gradient decorative stripes',
+  },
+  {
+    id: 'theater-slop-phrase',
+    category: 'slop',
+    severity: 'advisory',
+    gated: 'gpt',
+    name: 'Theater framing copy',
+    description:
+      'Dismissing something as "theater" is a recurring generated-copy tic. Say plainly what the thing does or does not do.',
+    skillSection: 'Copy',
+    skillGuideline: 'theater framing copy',
+  },
+  {
+    id: 'image-hover-transform',
+    category: 'slop',
+    severity: 'advisory',
+    gated: 'gemini',
+    name: 'Image hover transform',
+    description:
+      'Scaling or rotating an image on hover is a recurring generated-UI signature. Let imagery sit still, or use a subtler, purposeful interaction.',
+    skillSection: 'Motion',
+    skillGuideline: 'image scale or rotate on hover',
+  },
+];
+
+const RULE_ENGINE_SUPPORT = {
+  regex: new Set(['source', 'page-analyzer']),
+  'static-html': new Set(['element', 'page']),
+  browser: new Set(['element', 'page', 'layout']),
+  visual: new Set(['visual-contrast']),
+};
+
+function getAntipattern(id) {
+  return ANTIPATTERNS.find(rule => rule.id === id);
+}
+
+function getRulesForCategory(category) {
+  return ANTIPATTERNS.filter(rule => rule.category === category);
+}
+
+function getRuleEngineSupport(engine) {
+  return RULE_ENGINE_SUPPORT[engine] || new Set();
+}
+
+// Set of provider tags that gate rules off by default (e.g. 'gpt', 'gemini').
+const GATED_PROVIDERS = new Set(
+  ANTIPATTERNS.map(rule => rule.gated).filter(Boolean),
+);
+
+// Drop findings for rules gated behind a provider tag unless that provider
+// was explicitly enabled (CLI --gpt / --gemini). Non-gated findings always
+// pass through. `findings` carry the rule id on `.antipattern`.
+function filterByProviders(findings, providers = []) {
+  const enabled = new Set(providers || []);
+  if (!GATED_PROVIDERS.size) return findings;
+  return findings.filter(f => {
+    const rule = getAntipattern(f.antipattern);
+    if (!rule || !rule.gated) return true;
+    return enabled.has(rule.gated);
+  });
+}
+
+export {
+  ANTIPATTERNS,
+  RULE_ENGINE_SUPPORT,
+  GATED_PROVIDERS,
+  getAntipattern,
+  getRulesForCategory,
+  getRuleEngineSupport,
+  filterByProviders,
+};
diff --git a/tools/design-detector/detector/rules/checks.mjs b/tools/design-detector/detector/rules/checks.mjs
new file mode 100644
index 0000000..747d9a1
--- /dev/null
+++ b/tools/design-detector/detector/rules/checks.mjs
@@ -0,0 +1,2671 @@
+import {
+  BORDER_SAFE_TAGS,
+  GENERIC_FONTS,
+  KNOWN_SERIF_FONTS,
+  OVERUSED_FONTS,
+  SAFE_TAGS,
+  WCAG_LARGE_BOLD_TEXT_PX,
+  WCAG_LARGE_TEXT_PX,
+  isBrandFontOnOwnDomain,
+} from '../shared/constants.mjs';
+import {
+  colorToHex,
+  contrastRatio,
+  getHue,
+  hasChroma,
+  isNeutralColor,
+  parseGradientColors,
+  parseRgb,
+  relativeLuminance,
+} from '../shared/color.mjs';
+
+const DETECTOR_IS_BROWSER = typeof window !== 'undefined';
+
+// ─── Section 3: Pure Detection ──────────────────────────────────────────────
+
+function checkBorders(tag, widths, colors, radius) {
+  if (BORDER_SAFE_TAGS.has(tag)) return [];
+  const findings = [];
+  const sides = ['Top', 'Right', 'Bottom', 'Left'];
+
+  for (const side of sides) {
+    const w = widths[side];
+    if (w < 1 || isNeutralColor(colors[side])) continue;
+
+    const otherSides = sides.filter(s => s !== side);
+    const maxOther = Math.max(...otherSides.map(s => widths[s]));
+    if (!(w >= 2 && (maxOther <= 1 || w >= maxOther * 2))) continue;
+
+    const sn = side.toLowerCase();
+    const isSide = side === 'Left' || side === 'Right';
+
+    if (isSide) {
+      if (radius > 0) findings.push({ id: 'side-tab', snippet: `border-${sn}: ${w}px + border-radius: ${radius}px` });
+      else if (w >= 3) findings.push({ id: 'side-tab', snippet: `border-${sn}: ${w}px` });
+    } else {
+      if (radius > 0 && w >= 2) findings.push({ id: 'border-accent-on-rounded', snippet: `border-${sn}: ${w}px + border-radius: ${radius}px` });
+    }
+  }
+
+  return findings;
+}
+
+// Returns true if the given text is composed entirely of emoji characters
+// (plus whitespace / variation selectors). Emojis render as multicolor glyphs
+// regardless of CSS `color`, so contrast checks against the element's text
+// color are meaningless for these nodes.
+const EMOJI_CHAR_RE = /[\u{1F1E6}-\u{1F1FF}\u{1F300}-\u{1F9FF}\u{1FA00}-\u{1FAFF}\u{2600}-\u{27BF}\u{2300}-\u{23FF}\u{FE0F}\u{200D}\u{1F3FB}-\u{1F3FF}]/u;
+const EMOJI_CHARS_GLOBAL = /[\u{1F1E6}-\u{1F1FF}\u{1F300}-\u{1F9FF}\u{1FA00}-\u{1FAFF}\u{2600}-\u{27BF}\u{2300}-\u{23FF}\u{FE0F}\u{200D}\u{1F3FB}-\u{1F3FF}]/gu;
+function isEmojiOnlyText(text) {
+  if (!text) return false;
+  if (!EMOJI_CHAR_RE.test(text)) return false;
+  return text.replace(EMOJI_CHARS_GLOBAL, '').trim() === '';
+}
+
+function checkColors(opts) {
+  const { tag, textColor, bgColor, effectiveBg, effectiveBgStops, fontSize, fontWeight, hasDirectText, isEmojiOnly, bgClip, bgImage, classList } = opts;
+  if (SAFE_TAGS.has(tag)) {
+    // Exception for <a> and <button> elements styled as buttons. SAFE_TAGS
+    // exists to suppress contrast noise on inline links and unstyled controls,
+    // where the element has no own background and the contrast against the
+    // ancestor surface is already the intended visual. When the element has
+    // its own opaque background and direct text, it is a styled button — and
+    // contrast on its own surface is a real, frequent bug worth flagging.
+    const isStyledButton = (tag === 'a' || tag === 'button')
+      && hasDirectText
+      && bgColor && bgColor.a > 0.5;
+    if (!isStyledButton) return [];
+  }
+  const findings = [];
+
+  if (hasDirectText && textColor && !isEmojiOnly) {
+    // Run background-dependent checks against either a solid bg or, if the
+    // ancestor is a gradient, against every gradient stop (use the worst case).
+    const bgs = effectiveBg ? [effectiveBg] : (effectiveBgStops && effectiveBgStops.length ? effectiveBgStops : null);
+    if (bgs) {
+      // Gray on colored background — flag if every stop is chromatic
+      const textLum = relativeLuminance(textColor);
+      const isGray = !hasChroma(textColor, 20) && textLum > 0.05 && textLum < 0.85;
+      if (isGray && bgs.every(b => hasChroma(b, 40))) {
+        const bgLabel = effectiveBg ? colorToHex(effectiveBg) : `gradient(${bgs.map(colorToHex).join(', ')})`;
+        findings.push({ id: 'gray-on-color', snippet: `text ${colorToHex(textColor)} on bg ${bgLabel}` });
+      }
+
+      // Low contrast (WCAG AA) — worst case across all bg stops
+      const ratios = bgs.map(b => contrastRatio(textColor, b));
+      let worstIdx = 0;
+      for (let i = 1; i < ratios.length; i++) if (ratios[i] < ratios[worstIdx]) worstIdx = i;
+      const ratio = ratios[worstIdx];
+      const isLargeText = fontSize >= WCAG_LARGE_TEXT_PX || (fontSize >= WCAG_LARGE_BOLD_TEXT_PX && fontWeight >= 700);
+      const threshold = isLargeText ? 3.0 : 4.5;
+      if (ratio < threshold) {
+        // Skip the false-positive class where text has alpha < 1 AND we
+        // couldn't find an opaque ancestor (effectiveBg is null, we're
+        // comparing against gradient-stop fallback). In jsdom mode the
+        // detector can't resolve `var(--X)` color tokens, so a dark
+        // section sitting between the text and the body's decorative
+        // gradient is invisible to us — we end up measuring contrast
+        // against the body's paper-grain noise instead of the real
+        // local bg. Real low-contrast bugs use alpha=1 and have a
+        // resolvable opaque ancestor; semi-transparent Tailwind tokens
+        // like `text-paper/60` on `bg-ink` sections are the FP pattern.
+        const isAlphaFallbackFP = !DETECTOR_IS_BROWSER && !effectiveBg && (textColor.a != null && textColor.a < 1);
+        if (!isAlphaFallbackFP) {
+          findings.push({ id: 'low-contrast', snippet: `${ratio.toFixed(1)}:1 (need ${threshold}:1) — text ${colorToHex(textColor)} on ${colorToHex(bgs[worstIdx])}` });
+        }
+      }
+    }
+
+    // AI palette: purple/violet on headings
+    if (hasChroma(textColor, 50)) {
+      const hue = getHue(textColor);
+      if (hue >= 260 && hue <= 310 && (['h1', 'h2', 'h3'].includes(tag) || fontSize >= 20)) {
+        findings.push({ id: 'ai-color-palette', snippet: `Purple/violet text (${colorToHex(textColor)}) on heading` });
+      }
+    }
+  }
+
+  // Gradient text
+  if (bgClip === 'text' && bgImage && bgImage.includes('gradient')) {
+    findings.push({ id: 'gradient-text', snippet: 'background-clip: text + gradient' });
+  }
+
+  // Tailwind class checks
+  if (classList) {
+    const classStr = typeof classList === 'string' ? classList : Array.from(classList).join(' ');
+
+    const grayMatch = classStr.match(/\btext-(?:gray|slate|zinc|neutral|stone)-\d+\b/);
+    const colorBgMatch = classStr.match(/\bbg-(?:red|orange|amber|yellow|lime|green|emerald|teal|cyan|sky|blue|indigo|violet|purple|fuchsia|pink|rose)-\d+\b/);
+    if (grayMatch && colorBgMatch) {
+      findings.push({ id: 'gray-on-color', snippet: `${grayMatch[0]} on ${colorBgMatch[0]}` });
+    }
+
+    if (/\bbg-clip-text\b/.test(classStr) && /\bbg-gradient-to-/.test(classStr)) {
+      findings.push({ id: 'gradient-text', snippet: 'bg-clip-text + bg-gradient (Tailwind)' });
+    }
+
+    const purpleText = classStr.match(/\btext-(?:purple|violet|indigo)-\d+\b/);
+    if (purpleText && (['h1', 'h2', 'h3'].includes(tag) || /\btext-(?:[2-9]xl)\b/.test(classStr))) {
+      findings.push({ id: 'ai-color-palette', snippet: `${purpleText[0]} on heading` });
+    }
+
+    if (/\bfrom-(?:purple|violet|indigo)-\d+\b/.test(classStr) && /\bto-(?:purple|violet|indigo|blue|cyan|pink|fuchsia)-\d+\b/.test(classStr)) {
+      findings.push({ id: 'ai-color-palette', snippet: 'Purple/violet gradient (Tailwind)' });
+    }
+  }
+
+  return findings;
+}
+
+function isCardLikeFromProps(hasShadow, hasBorder, hasRadius, hasBg) {
+  if (!hasShadow && !hasBorder) return false;
+  return hasRadius || hasBg;
+}
+
+const HEADING_TAGS = new Set(['h1', 'h2', 'h3', 'h4', 'h5', 'h6']);
+
+// Pure check: given a heading and metrics about its previousElementSibling,
+// decide if the sibling is the canonical "icon-tile-stacked-above-heading" shape.
+//
+// Triggers when ALL of the following hold for the sibling:
+//   • size 32–128px on both axes (not too small, not a hero image)
+//   • aspect ratio 0.7–1.4 (squarish — excludes wide thumbnails / pill badges)
+//   • has a non-transparent background-color, background-image, OR a visible border
+//     (covers solid colors, white-with-border, gradients — anything that visually
+//      defines a tile)
+//   • border-radius < width/2 (excludes round avatars; rounded squares pass)
+//   • contains an <svg> or icon-class <i> element that's smaller than the tile
+//   • the tile sits above the heading (its bottom is above the heading's top)
+function checkIconTile(opts) {
+  const { headingTag, headingText, headingTop,
+          siblingTag, siblingWidth, siblingHeight, siblingBottom,
+          siblingBgColor, siblingBgImage, siblingBorderWidth, siblingBorderRadius,
+          hasIconChild, iconChildWidth } = opts;
+  if (!HEADING_TAGS.has(headingTag)) return [];
+  if (!siblingTag) return [];
+  // Don't recurse into nested headings (e.g. h2 above h3 in a section header)
+  if (HEADING_TAGS.has(siblingTag)) return [];
+
+  // Size window: 32–128px on each axis
+  if (!(siblingWidth >= 32 && siblingWidth <= 128)) return [];
+  if (!(siblingHeight >= 32 && siblingHeight <= 128)) return [];
+
+  // Squarish aspect ratio
+  const ratio = siblingWidth / siblingHeight;
+  if (ratio < 0.7 || ratio > 1.4) return [];
+
+  // Must have something that visually defines the tile
+  const bgVisible = (siblingBgColor && siblingBgColor.a > 0.1)
+    || (siblingBgImage && siblingBgImage !== 'none' && siblingBgImage !== '');
+  const borderVisible = siblingBorderWidth > 0;
+  if (!bgVisible && !borderVisible) return [];
+
+  // Exclude circles (avatars). Rounded squares pass.
+  if (siblingBorderRadius >= siblingWidth / 2) return [];
+
+  // Must contain an icon element smaller than the tile
+  if (!hasIconChild) return [];
+  if (iconChildWidth && iconChildWidth >= siblingWidth * 0.95) return [];
+
+  // Vertical stacking: tile must end above where the heading starts.
+  // (Allow the check to skip when both top/bottom are 0 — jsdom layout case.)
+  if (headingTop && siblingBottom && siblingBottom > headingTop + 4) return [];
+
+  const text = (headingText || '').trim().slice(0, 60);
+  return [{
+    id: 'icon-tile-stack',
+    snippet: `${Math.round(siblingWidth)}x${Math.round(siblingHeight)}px icon tile above ${headingTag} "${text}"`,
+  }];
+}
+
+// Resolve the primary (non-generic) face from a font-family string and return
+// whether the resolved primary is serif. Two paths:
+//   1. Primary face is in KNOWN_SERIF_FONTS → serif.
+//   2. Primary face is unknown but the stack ends in the generic `serif`
+//      token → treat as serif. Authors who declare `font-family: 'X', serif`
+//      almost always have a serif primary; a sans declared with a serif
+//      fallback is a code smell, not the common case.
+// Returns { primary, isSerif } so the snippet can name the face.
+function resolveSerif(fontFamily) {
+  if (!fontFamily) return { primary: null, isSerif: false };
+  const tokens = fontFamily.split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase());
+  const primary = tokens.find(f => f && !GENERIC_FONTS.has(f)) || null;
+  if (!primary) return { primary: null, isSerif: false };
+  if (KNOWN_SERIF_FONTS.has(primary)) return { primary, isSerif: true };
+  if (tokens.includes('serif')) return { primary, isSerif: true };
+  return { primary, isSerif: false };
+}
+
+function checkItalicSerif(opts) {
+  const { tag, fontStyle, fontFamily, fontSize, headingText } = opts;
+  if (fontStyle !== 'italic') return [];
+  // Anchor the rule on hero-scale text. h1 is the canonical hero element;
+  // h2 ≥ 48px catches the cases where the design demotes the visual hero
+  // to an h2 but keeps the size.
+  if (tag !== 'h1' && !(tag === 'h2' && fontSize >= 48)) return [];
+  if (fontSize < 48) return [];
+  const { primary, isSerif } = resolveSerif(fontFamily);
+  if (!isSerif) return [];
+
+  const text = (headingText || '').trim().slice(0, 60);
+  return [{
+    id: 'italic-serif-display',
+    snippet: `italic serif ${tag} (${primary || 'serif'}) at ${Math.round(fontSize)}px "${text}"`,
+  }];
+}
+
+// Color saturation check. Returns true when the color has visible
+// chroma — i.e., it's an "accent color" rather than near-neutral.
+// Handles rgb()/rgba(), #hex, oklch(), and hsl(). var() refs are
+// expected to be pre-resolved by the caller.
+function isAccentColor(cssColor) {
+  if (!cssColor) return false;
+  const s = String(cssColor).trim();
+  // rgb / rgba — direct channel-distance check.
+  const rgbM = /rgba?\(\s*(\d+)\s*,?\s+|\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)/.exec(s.replace(/rgba?\(\s*/, 'rgb(').replace(/,/g, ', '));
+  const rgbStrict = /rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)/.exec(s);
+  if (rgbStrict) {
+    const r = +rgbStrict[1], g = +rgbStrict[2], b = +rgbStrict[3];
+    return (Math.max(r, g, b) - Math.min(r, g, b)) >= 40;
+  }
+  // #hex — 3, 4, 6, or 8 digit.
+  const hexM = /^#([0-9a-f]{3,8})\b/i.exec(s);
+  if (hexM) {
+    let h = hexM[1];
+    if (h.length === 3 || h.length === 4) h = h.split('').map((c) => c + c).join('').slice(0, 6);
+    else h = h.slice(0, 6);
+    if (h.length === 6) {
+      const r = parseInt(h.slice(0, 2), 16);
+      const g = parseInt(h.slice(2, 4), 16);
+      const b = parseInt(h.slice(4, 6), 16);
+      return (Math.max(r, g, b) - Math.min(r, g, b)) >= 40;
+    }
+  }
+  // oklch(L C H) — chroma C is what matters. Typical neutral grays
+  // have C < 0.02; visible accents are 0.05+. CSS minification can
+  // collapse spaces between L% and C ("oklch(43%.15 34)"), so we
+  // extract all numbers and take the second rather than matching a
+  // strict L-then-whitespace-then-C pattern.
+  if (/^oklch\(/i.test(s)) {
+    const nums = s.match(/\d*\.\d+|\d+/g);
+    if (nums && nums.length >= 2) {
+      const c = parseFloat(nums[1]);
+      return !Number.isNaN(c) && c >= 0.05;
+    }
+  }
+  // hsl(H, S%, L%) — saturation > 20% reads as accent.
+  const hslM = /hsla?\(\s*[\d.]+\s*,\s*([\d.]+)%/i.exec(s);
+  if (hslM) {
+    const sat = parseFloat(hslM[1]);
+    return !Number.isNaN(sat) && sat >= 20;
+  }
+  return false;
+}
+
+// Sibling-relationship rule. Anchor on a hero-scale h1, look at the
+// previousElementSibling, and gate on EITHER the classic tracked-
+// uppercase eyebrow OR the modern accent-colored bold eyebrow.
+function checkHeroEyebrow(opts) {
+  const {
+    headingTag, headingText, headingFontSize,
+    siblingTag, siblingText, siblingTextTransform,
+    siblingFontSize, siblingLetterSpacing,
+    siblingFontWeight, siblingColor,
+  } = opts;
+  if (headingTag !== 'h1') return [];
+  // We previously gated on headingFontSize >= 48 to anchor "hero scale".
+  // But modern hero h1s use clamp() / vw / var(--text-*), none of which
+  // jsdom can resolve — the computed value comes back as "2em" or
+  // "var(--text-9xl)" and parseFloat returns 2 or NaN. The gate fails
+  // on virtually every Tailwind v4 / framework build. The other gates
+  // (sibling text 2-60 chars, font-size ≤ 14px, accent-bold OR
+  // tracked-caps) are tight enough to avoid false positives on non-
+  // hero h1s — a tiny tan label directly above any h1 is the
+  // antipattern regardless of how big the h1 ends up.
+  if (!siblingTag) return [];
+  // An h2 above an h1 is a different anti-pattern (heading hierarchy / dual
+  // headings) — never an eyebrow.
+  if (HEADING_TAGS.has(siblingTag)) return [];
+
+  const text = (siblingText || '').trim();
+  if (text.length < 2 || text.length > 60) return [];
+  if (!(siblingFontSize > 0 && siblingFontSize <= 14)) return [];
+
+  // Branch A: classic tracked-uppercase eyebrow.
+  const isUppercased = siblingTextTransform === 'uppercase'
+    || (/[A-Z]/.test(text) && !/[a-z]/.test(text));
+  const isClassicTracked = isUppercased && siblingLetterSpacing >= 1.6;
+
+  // Branch B: modern accent-bold eyebrow — sentence case, low
+  // tracking, but bold + accent-colored. The style choices changed;
+  // the pattern is the same kicker-above-headline anti-pattern.
+  const weight = Number(siblingFontWeight) || 400;
+  const isAccentBold = weight >= 700 && isAccentColor(siblingColor || '');
+
+  if (!isClassicTracked && !isAccentBold) return [];
+
+  const headingTextSnippet = (headingText || '').trim().slice(0, 60);
+  const eyebrowSnippet = text.slice(0, 40);
+  const style = isClassicTracked ? 'tracked-caps' : 'accent-bold';
+  return [{
+    id: 'hero-eyebrow-chip',
+    snippet: `eyebrow chip (${style}) "${eyebrowSnippet}" above ${headingTag} "${headingTextSnippet}"`,
+  }];
+}
+
+function checkRepeatedSectionKickers(opts) {
+  const { candidates, minCount = 3 } = opts;
+  if (!Array.isArray(candidates) || candidates.length < minCount) return [];
+  return candidates.map(candidate => ({
+    id: 'repeated-section-kickers',
+    snippet: `repeated section kicker "${candidate.kickerText}" before ${candidate.headingTag} "${candidate.headingText}" (${candidates.length} on page)`,
+  }));
+}
+
+const LAYOUT_TRANSITION_PROPS = new Set([
+  'width', 'height', 'padding', 'margin',
+  'max-height', 'max-width', 'min-height', 'min-width',
+  'padding-top', 'padding-right', 'padding-bottom', 'padding-left',
+  'margin-top', 'margin-right', 'margin-bottom', 'margin-left',
+]);
+
+function checkMotion(opts) {
+  const { tag, transitionProperty, animationName, timingFunctions, classList } = opts;
+  if (SAFE_TAGS.has(tag)) return [];
+  const findings = [];
+
+  // --- Bounce/elastic easing ---
+  if (animationName && animationName !== 'none' && /bounce|elastic|wobble|jiggle|spring/i.test(animationName)) {
+    findings.push({ id: 'bounce-easing', snippet: `animation: ${animationName}` });
+  }
+  if (classList && /\banimate-bounce\b/.test(classList)) {
+    findings.push({ id: 'bounce-easing', snippet: 'animate-bounce (Tailwind)' });
+  }
+
+  // Check timing functions for overshoot cubic-bezier (y values outside [0, 1])
+  if (timingFunctions) {
+    const bezierRe = /cubic-bezier\(\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*\)/g;
+    let m;
+    while ((m = bezierRe.exec(timingFunctions)) !== null) {
+      const y1 = parseFloat(m[2]), y2 = parseFloat(m[4]);
+      if (y1 < -0.1 || y1 > 1.1 || y2 < -0.1 || y2 > 1.1) {
+        findings.push({ id: 'bounce-easing', snippet: `cubic-bezier(${m[1]}, ${m[2]}, ${m[3]}, ${m[4]})` });
+        break;
+      }
+    }
+  }
+
+  // --- Layout property transition ---
+  if (transitionProperty && transitionProperty !== 'all' && transitionProperty !== 'none') {
+    const props = transitionProperty.split(',').map(p => p.trim().toLowerCase());
+    const layoutFound = props.filter(p => LAYOUT_TRANSITION_PROPS.has(p));
+    if (layoutFound.length > 0) {
+      findings.push({ id: 'layout-transition', snippet: `transition: ${layoutFound.join(', ')}` });
+    }
+  }
+
+  return findings;
+}
+
+function checkGlow(opts) {
+  const { boxShadow, effectiveBg } = opts;
+  if (!boxShadow || boxShadow === 'none') return [];
+  if (!effectiveBg) return [];
+
+  // Only flag on dark backgrounds (luminance < 0.1)
+  const bgLum = relativeLuminance(effectiveBg);
+  if (bgLum >= 0.1) return [];
+
+  // Split multiple shadows (commas not inside parentheses)
+  const parts = boxShadow.split(/,(?![^(]*\))/);
+  for (const shadow of parts) {
+    const colorMatch = shadow.match(/rgba?\([^)]+\)/);
+    if (!colorMatch) continue;
+    const color = parseRgb(colorMatch[0]);
+    if (!color || !hasChroma(color, 30)) continue;
+
+    // Extract px values — in computed style: "color Xpx Ypx BLURpx [SPREADpx]"
+    const afterColor = shadow.substring(shadow.indexOf(colorMatch[0]) + colorMatch[0].length);
+    const beforeColor = shadow.substring(0, shadow.indexOf(colorMatch[0]));
+    const pxVals = [...beforeColor.matchAll(/([\d.]+)px/g), ...afterColor.matchAll(/([\d.]+)px/g)]
+      .map(m => parseFloat(m[1]));
+
+    // Third value is blur (offset-x, offset-y, blur, [spread])
+    if (pxVals.length >= 3 && pxVals[2] > 4) {
+      return [{ id: 'dark-glow', snippet: `Colored glow (${colorToHex(color)}) on dark background` }];
+    }
+  }
+
+  return [];
+}
+
+/**
+ * Regex-on-HTML checks shared between browser and Node page-level detection.
+ * These don't need DOM access, just the raw HTML string.
+ */
+function checkHtmlPatterns(html) {
+  const findings = [];
+
+  // --- Color ---
+
+  // AI color palette: purple/violet
+  const purpleHexRe = /#(?:7c3aed|8b5cf6|a855f7|9333ea|7e22ce|6d28d9|6366f1|764ba2|667eea)\b/gi;
+  if (purpleHexRe.test(html)) {
+    const purpleTextRe = /(?:(?:^|;)\s*color\s*:\s*(?:.*?)(?:#(?:7c3aed|8b5cf6|a855f7|9333ea|7e22ce|6d28d9))|gradient.*?#(?:7c3aed|8b5cf6|a855f7|764ba2|667eea))/gi;
+    if (purpleTextRe.test(html)) {
+      findings.push({ id: 'ai-color-palette', snippet: 'Purple/violet accent colors detected' });
+    }
+  }
+
+  // Gradient text (background-clip: text + gradient)
+  const gradientRe = /(?:-webkit-)?background-clip\s*:\s*text/gi;
+  let gm;
+  while ((gm = gradientRe.exec(html)) !== null) {
+    const start = Math.max(0, gm.index - 200);
+    const context = html.substring(start, gm.index + gm[0].length + 200);
+    if (/gradient/i.test(context)) {
+      findings.push({ id: 'gradient-text', snippet: 'background-clip: text + gradient' });
+      break;
+    }
+  }
+  if (/\bbg-clip-text\b/.test(html) && /\bbg-gradient-to-/.test(html)) {
+    findings.push({ id: 'gradient-text', snippet: 'bg-clip-text + bg-gradient (Tailwind)' });
+  }
+
+  // --- Layout ---
+
+  // Monotonous spacing
+  const spacingValues = [];
+  const spacingRe = /(?:padding|margin)(?:-(?:top|right|bottom|left))?\s*:\s*(\d+)px/gi;
+  let sm;
+  while ((sm = spacingRe.exec(html)) !== null) {
+    const v = parseInt(sm[1], 10);
+    if (v > 0 && v < 200) spacingValues.push(v);
+  }
+  const gapRe = /gap\s*:\s*(\d+)px/gi;
+  while ((sm = gapRe.exec(html)) !== null) {
+    spacingValues.push(parseInt(sm[1], 10));
+  }
+  const twSpaceRe = /\b(?:p|px|py|pt|pb|pl|pr|m|mx|my|mt|mb|ml|mr|gap)-(\d+)\b/g;
+  while ((sm = twSpaceRe.exec(html)) !== null) {
+    spacingValues.push(parseInt(sm[1], 10) * 4);
+  }
+  const remSpacingRe = /(?:padding|margin)(?:-(?:top|right|bottom|left))?\s*:\s*([\d.]+)rem/gi;
+  while ((sm = remSpacingRe.exec(html)) !== null) {
+    const v = Math.round(parseFloat(sm[1]) * 16);
+    if (v > 0 && v < 200) spacingValues.push(v);
+  }
+  const roundedSpacing = spacingValues.map(v => Math.round(v / 4) * 4);
+  if (roundedSpacing.length >= 10) {
+    const counts = {};
+    for (const v of roundedSpacing) counts[v] = (counts[v] || 0) + 1;
+    const maxCount = Math.max(...Object.values(counts));
+    const dominantPct = maxCount / roundedSpacing.length;
+    const unique = [...new Set(roundedSpacing)].filter(v => v > 0);
+    if (dominantPct > 0.6 && unique.length <= 3) {
+      const dominant = Object.entries(counts).sort((a, b) => b[1] - a[1])[0][0];
+      findings.push({
+        id: 'monotonous-spacing',
+        snippet: `~${dominant}px used ${maxCount}/${roundedSpacing.length} times (${Math.round(dominantPct * 100)}%)`,
+      });
+    }
+  }
+
+  // --- Motion ---
+
+  // Bounce/elastic animation names
+  const bounceRe = /animation(?:-name)?\s*:\s*([^;{}]*(?:bounce|elastic|wobble|jiggle|spring)[^;{}]*)/gi;
+  const bounceMatch = bounceRe.exec(html);
+  if (bounceMatch) {
+    const animationToken = bounceMatch[1]
+      .split(/[,\s]+/)
+      .find((part) => /bounce|elastic|wobble|jiggle|spring/i.test(part));
+    findings.push({ id: 'bounce-easing', snippet: `animation: ${animationToken || bounceMatch[1].trim()}` });
+  }
+
+  // Overshoot cubic-bezier
+  const bezierRe = /cubic-bezier\(\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*,\s*([\d.-]+)\s*\)/g;
+  let bm;
+  while ((bm = bezierRe.exec(html)) !== null) {
+    const y1 = parseFloat(bm[2]), y2 = parseFloat(bm[4]);
+    if (y1 < -0.1 || y1 > 1.1 || y2 < -0.1 || y2 > 1.1) {
+      findings.push({ id: 'bounce-easing', snippet: `cubic-bezier(${bm[1]}, ${bm[2]}, ${bm[3]}, ${bm[4]})` });
+      break;
+    }
+  }
+
+  // Layout property transitions
+  const transRe = /transition(?:-property)?\s*:\s*([^;{}]+)/gi;
+  let tm;
+  while ((tm = transRe.exec(html)) !== null) {
+    const val = tm[1].toLowerCase();
+    if (/\ball\b/.test(val)) continue;
+    const found = val.match(/\b(?:(?:max|min)-)?(?:width|height)\b|\bpadding(?:-(?:top|right|bottom|left))?\b|\bmargin(?:-(?:top|right|bottom|left))?\b/gi);
+    if (found) {
+      findings.push({ id: 'layout-transition', snippet: `transition: ${found.join(', ')}` });
+      break;
+    }
+  }
+
+  // --- Dark glow ---
+
+  const darkBgRe = /background(?:-color)?\s*:\s*(?:#(?:0[0-9a-f]|1[0-9a-f]|2[0-3])[0-9a-f]{4}\b|#(?:0|1)[0-9a-f]{2}\b|rgb\(\s*(\d{1,2})\s*,\s*(\d{1,2})\s*,\s*(\d{1,2})\s*\))/gi;
+  const twDarkBg = /\bbg-(?:gray|slate|zinc|neutral|stone)-(?:9\d{2}|800)\b/;
+  if (darkBgRe.test(html) || twDarkBg.test(html)) {
+    const shadowRe = /box-shadow\s*:\s*([^;{}]+)/gi;
+    let shm;
+    while ((shm = shadowRe.exec(html)) !== null) {
+      const val = shm[1];
+      const colorMatch = val.match(/rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)/);
+      if (!colorMatch) continue;
+      const [r, g, b] = [+colorMatch[1], +colorMatch[2], +colorMatch[3]];
+      if ((Math.max(r, g, b) - Math.min(r, g, b)) < 30) continue;
+      const pxVals = [...val.matchAll(/(\d+)px|(?<![.\d])\b(0)\b(?![.\d])/g)].map(p => +(p[1] || p[2]));
+      if (pxVals.length >= 3 && pxVals[2] > 4) {
+        findings.push({ id: 'dark-glow', snippet: `Colored glow (rgb(${r},${g},${b})) on dark page` });
+        break;
+      }
+    }
+  }
+
+  // --- Provider tells (gated): repeating-gradient stripes (GPT) ---
+  if (/repeating-(?:linear|radial|conic)-gradient\s*\(/i.test(html)) {
+    findings.push({ id: 'repeating-stripes-gradient', snippet: 'repeating-gradient decorative stripes' });
+  }
+
+  // --- Provider tells (gated): "X theater" framing copy (GPT) ---
+  // Lives here (regex-on-HTML) rather than in the text-content analyzers so it
+  // runs in the bundled browser path too, not just the CLI/static path.
+  {
+    const bodyText = html
+      .replace(/<script\b[^>]*>[\s\S]*?<\/script>/gi, ' ')
+      .replace(/<style\b[^>]*>[\s\S]*?<\/style>/gi, ' ')
+      .replace(/<[^>]+>/g, ' ');
+    const tm = /\b(\w+)\s+theater\b/i.exec(bodyText);
+    if (tm) findings.push({ id: 'theater-slop-phrase', snippet: `"${tm[0].trim()}"` });
+  }
+
+  // --- Provider tells (gated): image hover transform (Gemini) ---
+  // A CSS `img...:hover { transform: ... }` rule, or a Tailwind hover:scale /
+  // hover:rotate / hover:translate utility on an <img>. Each distinct
+  // mechanism is its own finding.
+  const imgHoverCss = /\bimg\b[^,{}]*:hover\b[^{}]*\{[^}]*\btransform\s*:\s*(?:scale|rotate|translate|matrix|skew)/i;
+  if (imgHoverCss.test(html)) {
+    findings.push({ id: 'image-hover-transform', snippet: 'img:hover { transform } rule' });
+  }
+  const imgTagRe = /<img\b[^>]*\bclass\s*=\s*"([^"]*)"/gi;
+  let im;
+  while ((im = imgTagRe.exec(html)) !== null) {
+    if (/\bhover:(?:scale|rotate|translate|skew)-/.test(im[1])) {
+      findings.push({ id: 'image-hover-transform', snippet: 'Tailwind hover transform on <img>' });
+    }
+  }
+
+  return findings;
+}
+
+// ─── Section 4: resolveBackground (unified) ─────────────────────────────────
+
+// Read the element's own background color, computed-style first, with a
+// jsdom-friendly fallback that parses the inline `background:` shorthand
+// from the raw style attribute. jsdom (~v29) does not decompose the
+// shorthand into `backgroundColor`, so without this fallback the CLI silently
+// returns null for any element styled via `background: rgb(...)` or
+// `background: #abc`. Real browsers always decompose, so the fallback is
+// a no-op there.
+function readOwnBackgroundColor(el, computedStyle) {
+  const bg = parseRgb(computedStyle.backgroundColor);
+  if (DETECTOR_IS_BROWSER || (bg && bg.a >= 0.1)) return bg;
+  const rawStyle = el.getAttribute?.('style') || '';
+  const bgMatch = rawStyle.match(/background(?:-color)?\s*:\s*([^;]+)/i);
+  const inlineBg = bgMatch ? bgMatch[1].trim() : '';
+  if (!inlineBg) return bg;
+  if (/gradient/i.test(inlineBg) || /url\s*\(/i.test(inlineBg)) return bg;
+  const fromRgb = parseRgb(inlineBg);
+  if (fromRgb) return fromRgb;
+  const hexMatch = inlineBg.match(/#([0-9a-f]{6}|[0-9a-f]{3})\b/i);
+  if (hexMatch) {
+    const h = hexMatch[1];
+    if (h.length === 6) {
+      return { r: parseInt(h.slice(0, 2), 16), g: parseInt(h.slice(2, 4), 16), b: parseInt(h.slice(4, 6), 16), a: 1 };
+    }
+    return { r: parseInt(h[0] + h[0], 16), g: parseInt(h[1] + h[1], 16), b: parseInt(h[2] + h[2], 16), a: 1 };
+  }
+  return bg;
+}
+
+function resolveBackground(el, win, customPropMap) {
+  let current = el;
+  while (current && current.nodeType === 1) {
+    const style = DETECTOR_IS_BROWSER ? getComputedStyle(current) : win.getComputedStyle(current);
+    const bgImage = style.backgroundImage || '';
+    const hasGradientOrUrl = bgImage && bgImage !== 'none' && (/gradient/i.test(bgImage) || /url\s*\(/i.test(bgImage));
+
+    // Try the solid bg-color FIRST. If the element has both a solid color
+    // and a gradient/url overlay (a common pattern: `background: var(--paper)
+    // radial-gradient(...)` for paper-grain texture), the solid color is the
+    // dominant visible surface for contrast purposes; the overlay is
+    // decorative. The old behavior bailed on any gradient ancestor, which
+    // caused massive false-positive contrast findings on grain-textured
+    // body backgrounds.
+    let bg = parseRgb(style.backgroundColor);
+    if (!DETECTOR_IS_BROWSER && (!bg || bg.a < 0.1)) {
+      // jsdom returns literal "var(--X)" / "oklch(...)" strings. Resolve
+      // through customPropMap so Tailwind v4 color tokens become RGB.
+      if (customPropMap) {
+        bg = parseColorResolved(style.backgroundColor, customPropMap);
+      }
+      if (!bg || bg.a < 0.1) {
+        // Inline-style fallback. jsdom doesn't decompose background
+        // shorthand, so colors set via inline style are otherwise invisible.
+        const rawStyle = current.getAttribute?.('style') || '';
+        const bgMatch = rawStyle.match(/background(?:-color)?\s*:\s*([^;]+)/i);
+        const inlineBg = bgMatch ? bgMatch[1].trim() : '';
+        if (inlineBg && !/gradient/i.test(inlineBg) && !/url\s*\(/i.test(inlineBg)) {
+          bg = parseColorResolved(inlineBg, customPropMap) || parseAnyColor(inlineBg);
+        }
+      }
+    }
+
+    if (bg && bg.a > 0.1) {
+      if (DETECTOR_IS_BROWSER || bg.a >= 0.5) return bg;
+    }
+    // No solid bg-color at this level. If THIS level has a gradient/url
+    // with no underlying solid color we can read:
+    //   • on body/html: assume white. Body-level gradients are almost
+    //     always decorative texture (paper grain, noise) on top of a
+    //     solid bg-color the page set via `background: var(--paper)`
+    //     shorthand — which jsdom can't decompose into bg-color. The
+    //     downstream gradient-stops fallback path produces catastrophic
+    //     false positives in this case (gradient noise stops have
+    //     accidental browns/blacks that look like card backgrounds).
+    //   • on other elements: bail to null and let the caller fall back
+    //     to gradient stops (gradient buttons / hero sections are real
+    //     bgs worth checking against).
+    if (hasGradientOrUrl) {
+      if (current.tagName === 'BODY' || current.tagName === 'HTML') {
+        return { r: 255, g: 255, b: 255, a: 1 };
+      }
+      return null;
+    }
+    current = current.parentElement;
+  }
+  return { r: 255, g: 255, b: 255 };
+}
+
+// Walk parents looking for a gradient background and return its color stops.
+// Used as a fallback when resolveBackground() returns null because the
+// effective background is a gradient (no single solid color to compare against).
+function resolveGradientStops(el, win) {
+  let current = el;
+  while (current && current.nodeType === 1) {
+    const style = DETECTOR_IS_BROWSER ? getComputedStyle(current) : win.getComputedStyle(current);
+    const bgImage = style.backgroundImage || '';
+    if (bgImage && bgImage !== 'none' && /gradient/i.test(bgImage)) {
+      const stops = parseGradientColors(bgImage);
+      if (stops.length > 0) return stops;
+    }
+    if (!DETECTOR_IS_BROWSER) {
+      // jsdom doesn't decompose `background:` shorthand — peek at the raw inline style
+      const rawStyle = current.getAttribute?.('style') || '';
+      const bgMatch = rawStyle.match(/background(?:-image)?\s*:\s*([^;]+)/i);
+      if (bgMatch && /gradient/i.test(bgMatch[1])) {
+        const stops = parseGradientColors(bgMatch[1]);
+        if (stops.length > 0) return stops;
+      }
+    }
+    current = current.parentElement;
+  }
+  return null;
+}
+
+// Parse a single CSS length token to pixels. Accepts "12px", "50%", a
+// shorthand like "12px 4px" (uses the first value), or empty / null.
+// Returns the pixel value, or null when the input is unparseable.
+// Percentages convert against `widthPx` when one is supplied. Without a
+// usable width (jsdom returns "auto" for many real-world elements,
+// which parseFloat collapses to 0), fall back to the raw percentage
+// number so callers gating on `> 0` (border-accent-on-rounded,
+// isCardLike's hasRadius) still see a positive value, matching the
+// original parseFloat("50%") === 50 behavior.
+function parseRadiusToPx(value, widthPx) {
+  if (!value || typeof value !== 'string') return null;
+  const trimmed = value.trim();
+  if (!trimmed) return null;
+  const first = trimmed.split(/\s+/)[0];
+  const num = parseFloat(first);
+  if (Number.isNaN(num)) return null;
+  if (/%$/.test(first)) {
+    if (widthPx && widthPx > 0) return (num / 100) * widthPx;
+    return num;
+  }
+  return num;
+}
+
+function resolveBorderRadiusPx(el, style, widthPx, win) {
+  const fromComputed = parseRadiusToPx(style.borderRadius, widthPx);
+  if (fromComputed !== null) return fromComputed;
+  return 0;
+}
+
+// ─── Section 5: Element Adapters ────────────────────────────────────────────
+
+// Browser adapters — call getComputedStyle/getBoundingClientRect on live DOM
+
+function checkElementBordersDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (BORDER_SAFE_TAGS.has(tag)) return [];
+  const rect = el.getBoundingClientRect();
+  if (rect.width < 20 || rect.height < 20) return [];
+  const style = getComputedStyle(el);
+  const sides = ['Top', 'Right', 'Bottom', 'Left'];
+  const widths = {}, colors = {};
+  for (const s of sides) {
+    widths[s] = parseFloat(style[`border${s}Width`]) || 0;
+    colors[s] = style[`border${s}Color`] || '';
+  }
+  return checkBorders(tag, widths, colors, parseFloat(style.borderRadius) || 0);
+}
+
+function checkElementColorsDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  // No early SAFE_TAGS bail here — checkColors() does its own gating that
+  // includes the styled-button exception for <a> / <button> with their own
+  // opaque background. Bailing here would prevent that exception from firing.
+  const rect = el.getBoundingClientRect();
+  if (rect.width < 10 || rect.height < 10) return [];
+  const style = getComputedStyle(el);
+  const directText = [...el.childNodes].filter(n => n.nodeType === 3).map(n => n.textContent).join('');
+  const hasDirectText = directText.trim().length > 0;
+  const effectiveBg = resolveBackground(el);
+  return checkColors({
+    tag,
+    textColor: parseRgb(style.color),
+    bgColor: readOwnBackgroundColor(el, style),
+    effectiveBg,
+    effectiveBgStops: effectiveBg ? null : resolveGradientStops(el),
+    fontSize: parseFloat(style.fontSize) || 16,
+    fontWeight: parseInt(style.fontWeight) || 400,
+    hasDirectText,
+    isEmojiOnly: isEmojiOnlyText(directText),
+    bgClip: style.webkitBackgroundClip || style.backgroundClip || '',
+    bgImage: style.backgroundImage || '',
+    classList: el.getAttribute('class') || '',
+  });
+}
+
+function checkElementIconTileDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (!HEADING_TAGS.has(tag)) return [];
+  const sibling = el.previousElementSibling;
+  if (!sibling) return [];
+
+  const sibRect = sibling.getBoundingClientRect();
+  const headRect = el.getBoundingClientRect();
+  const sibStyle = getComputedStyle(sibling);
+
+  // The tile may either contain an <svg>/<i> icon child, OR the tile itself
+  // may contain an emoji/symbol character directly as its only text content
+  // (the "card-icon" pattern from many AI-generated demos).
+  const iconChild = sibling.querySelector('svg, i[data-lucide], i[class*="fa-"], i[class*="icon"]');
+  const iconRect = iconChild?.getBoundingClientRect();
+  const sibDirectText = [...sibling.childNodes].filter(n => n.nodeType === 3).map(n => n.textContent).join('');
+  const hasInlineEmojiIcon = sibling.children.length === 0 && isEmojiOnlyText(sibDirectText);
+
+  return checkIconTile({
+    headingTag: tag,
+    headingText: el.textContent || '',
+    headingTop: headRect.top,
+    siblingTag: sibling.tagName.toLowerCase(),
+    siblingWidth: sibRect.width,
+    siblingHeight: sibRect.height,
+    siblingBottom: sibRect.bottom,
+    siblingBgColor: parseRgb(sibStyle.backgroundColor),
+    siblingBgImage: sibStyle.backgroundImage || '',
+    siblingBorderWidth: parseFloat(sibStyle.borderTopWidth) || 0,
+    siblingBorderRadius: parseFloat(sibStyle.borderRadius) || 0,
+    hasIconChild: !!iconChild || hasInlineEmojiIcon,
+    iconChildWidth: iconRect?.width || 0,
+  });
+}
+
+function checkElementItalicSerifDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (tag !== 'h1' && tag !== 'h2') return [];
+  const style = getComputedStyle(el);
+  return checkItalicSerif({
+    tag,
+    fontStyle: style.fontStyle || '',
+    fontFamily: style.fontFamily || '',
+    fontSize: parseFloat(style.fontSize) || 0,
+    headingText: el.textContent || '',
+  });
+}
+
+function checkElementHeroEyebrowDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (tag !== 'h1') return [];
+  const sibling = el.previousElementSibling;
+  if (!sibling) return [];
+  const headStyle = getComputedStyle(el);
+  const sibStyle = getComputedStyle(sibling);
+  return checkHeroEyebrow({
+    headingTag: tag,
+    headingText: el.textContent || '',
+    headingFontSize: parseFloat(headStyle.fontSize) || 0,
+    siblingTag: sibling.tagName.toLowerCase(),
+    siblingText: sibling.textContent || '',
+    siblingTextTransform: sibStyle.textTransform || '',
+    siblingFontSize: parseFloat(sibStyle.fontSize) || 0,
+    siblingLetterSpacing: parseFloat(sibStyle.letterSpacing) || 0,
+    siblingFontWeight: sibStyle.fontWeight || '',
+    siblingColor: sibStyle.color || '',
+  });
+}
+
+// Build a map of CSS custom properties declared on :root / :host / html.
+// Used to resolve var(--X) refs that jsdom returns verbatim in
+// getComputedStyle. Tailwind v4 routes every utility class through
+// CSS vars (font-weight: var(--font-weight-bold), font-size:
+// var(--text-xs), letter-spacing: var(--tracking-widest)), so without
+// resolution every style-based check silently fails on Tailwind v4
+// builds — the values come back as literal "var(--font-weight-bold)"
+// strings and parseFloat returns NaN.
+function buildCustomPropMap(document) {
+  const map = new Map();
+  let sheets;
+  try { sheets = Array.from(document.styleSheets || []); }
+  catch { return map; }
+  for (const sheet of sheets) {
+    let rules;
+    try { rules = Array.from(sheet.cssRules || []); }
+    catch { continue; }
+    for (const rule of rules) {
+      // Style rules only (type 1). Walk @media / @supports if present.
+      if (rule.type === 4 /* MEDIA_RULE */ || rule.type === 12 /* SUPPORTS_RULE */) {
+        try { rules.push(...Array.from(rule.cssRules || [])); } catch { /* ignore */ }
+        continue;
+      }
+      if (rule.type !== 1 /* STYLE_RULE */) continue;
+      const sel = rule.selectorText || '';
+      if (!/(^|,\s*)(:root|html|:host)\b/i.test(sel)) continue;
+      const style = rule.style;
+      if (!style) continue;
+      for (let i = 0; i < style.length; i++) {
+        const prop = style[i];
+        if (!prop || !prop.startsWith('--')) continue;
+        const val = style.getPropertyValue(prop).trim();
+        if (val) map.set(prop, val);
+      }
+    }
+  }
+  return map;
+}
+
+// Resolve var(--X[, fallback]) refs in a computed-style value string.
+// Recurses up to 8 levels for chained refs (--a: var(--b)). Returns
+// the original string when no refs are present or the chain doesn't
+// resolve. Safe to call on already-resolved values.
+function resolveVarRefs(raw, customPropMap, depth = 0) {
+  if (typeof raw !== 'string' || !raw.includes('var(')) return raw;
+  if (depth > 8) return raw;
+  return raw.replace(/var\(\s*(--[a-zA-Z0-9_-]+)\s*(?:,\s*([^)]+))?\)/g, (_m, name, fallback) => {
+    const v = customPropMap.get(name);
+    if (v != null) return resolveVarRefs(v, customPropMap, depth + 1);
+    return fallback ? resolveVarRefs(fallback.trim(), customPropMap, depth + 1) : _m;
+  });
+}
+
+// OKLCH → sRGB conversion (Björn Ottosson's matrices). L in 0..1 (or %),
+// C in 0..~0.4 typical, H in degrees. Returns clamped {r,g,b,a:1} in 0..255.
+// Needed because jsdom doesn't compute oklch() values — getComputedStyle
+// returns the literal "oklch(...)" string. Without this, the entire
+// Tailwind v4 color palette (which is OKLCH-based) is invisible to the
+// detector's contrast / color checks.
+function oklchToRgb(L, C, H) {
+  const hRad = (H * Math.PI) / 180;
+  const a = C * Math.cos(hRad);
+  const b = C * Math.sin(hRad);
+  const l_ = L + 0.3963377774 * a + 0.2158037573 * b;
+  const m_ = L - 0.1055613458 * a - 0.0638541728 * b;
+  const s_ = L - 0.0894841775 * a - 1.2914855480 * b;
+  const lc = l_ * l_ * l_, mc = m_ * m_ * m_, sc = s_ * s_ * s_;
+  const rLin =  4.0767416621 * lc - 3.3077115913 * mc + 0.2309699292 * sc;
+  const gLin = -1.2684380046 * lc + 2.6097574011 * mc - 0.3413193965 * sc;
+  const bLin = -0.0041960863 * lc - 0.7034186147 * mc + 1.7076147010 * sc;
+  const enc = (x) => {
+    const c = Math.max(0, Math.min(1, x));
+    return c <= 0.0031308 ? 12.92 * c : 1.055 * Math.pow(c, 1 / 2.4) - 0.055;
+  };
+  return {
+    r: Math.round(enc(rLin) * 255),
+    g: Math.round(enc(gLin) * 255),
+    b: Math.round(enc(bLin) * 255),
+    a: 1,
+  };
+}
+
+// Extended color parser: rgb/rgba/hex/oklch. Returns null on no match.
+// Use this when the input might be any CSS color form; use plain parseRgb
+// when you only expect computed rgb() values from real browsers.
+function parseAnyColor(s) {
+  if (!s || typeof s !== 'string') return null;
+  const str = s.trim();
+  if (str === 'transparent' || str === 'currentcolor' || str === 'inherit') return null;
+  let m;
+  m = str.match(/rgba?\(\s*(\d+(?:\.\d+)?)\s*,?\s*(\d+(?:\.\d+)?)\s*,?\s*(\d+(?:\.\d+)?)(?:\s*[,/]\s*([\d.]+))?\s*\)/);
+  if (m) return { r: Math.round(+m[1]), g: Math.round(+m[2]), b: Math.round(+m[3]), a: m[4] !== undefined ? +m[4] : 1 };
+  m = str.match(/^#([0-9a-f]{3,8})$/i);
+  if (m) {
+    const h = m[1];
+    if (h.length === 3 || h.length === 4) {
+      return {
+        r: parseInt(h[0] + h[0], 16),
+        g: parseInt(h[1] + h[1], 16),
+        b: parseInt(h[2] + h[2], 16),
+        a: h.length === 4 ? parseInt(h[3] + h[3], 16) / 255 : 1,
+      };
+    }
+    if (h.length === 6 || h.length === 8) {
+      return {
+        r: parseInt(h.slice(0, 2), 16),
+        g: parseInt(h.slice(2, 4), 16),
+        b: parseInt(h.slice(4, 6), 16),
+        a: h.length === 8 ? parseInt(h.slice(6, 8), 16) / 255 : 1,
+      };
+    }
+  }
+  // OKLCH parser. Tailwind v4's CSS minifier squishes the space after
+  // `%` ("21.5%.02 50"), so the separator between L and C may be absent.
+  // Match L (with optional %), then C and H separated permissively.
+  m = str.match(/oklch\(\s*([\d.]+)(%?)\s*[\s,]*\s*([\d.]+)\s*[\s,]+\s*([-\d.]+)(?:deg)?(?:\s*\/\s*([\d.]+)(%)?)?\s*\)/i);
+  if (m) {
+    const Lnum = parseFloat(m[1]);
+    const L = m[2] === '%' ? Lnum / 100 : Lnum;
+    const rgb = oklchToRgb(L, parseFloat(m[3]), parseFloat(m[4]));
+    if (m[5] !== undefined) {
+      const alpha = parseFloat(m[5]);
+      rgb.a = m[6] === '%' ? alpha / 100 : alpha;
+    }
+    return rgb;
+  }
+  return null;
+}
+
+// Resolve var() refs in a color string (via customPropMap), then parse.
+// Returns null on any failure. Used in jsdom-mode paths where
+// getComputedStyle returns literal "var(--X)" or "oklch(...)" strings.
+function parseColorResolved(str, customPropMap) {
+  if (!str) return null;
+  const resolved = customPropMap ? resolveVarRefs(str, customPropMap) : str;
+  return parseAnyColor(resolved);
+}
+
+const REPEATED_KICKER_SKIP_SELECTOR = [
+  'nav',
+  'form',
+  'table',
+  'thead',
+  'tbody',
+  'tfoot',
+  'figure',
+  'figcaption',
+  'ol',
+  'ul',
+  'li',
+  '[role="navigation"]',
+  '[aria-label*="breadcrumb" i]',
+  '[class*="breadcrumb" i]',
+  '[aria-hidden="true"]',
+  '[data-impeccable-allow-kickers]',
+].join(',');
+
+const REPEATED_KICKER_CARD_CONTEXT_SELECTOR = [
+  'article',
+  'button',
+  'a',
+  'li',
+  '[role="listitem"]',
+  '[role="option"]',
+].join(',');
+
+function cleanInlineText(el) {
+  return [...el.childNodes]
+    .filter(n => n.nodeType === 3)
+    .map(n => n.textContent)
+    .join(' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+}
+
+function isRepeatedKickerCardContext(heading, kicker) {
+  const item = heading.closest?.(REPEATED_KICKER_CARD_CONTEXT_SELECTOR);
+  return Boolean(item && (!item.contains || item.contains(kicker)));
+}
+
+function isRepeatedKickerCandidate(opts) {
+  const {
+    headingTag,
+    headingText,
+    headingFontSize,
+    kickerTag,
+    kickerText,
+    kickerTextTransform,
+    kickerFontSize,
+    kickerLetterSpacing,
+  } = opts;
+  if (!['h2', 'h3', 'h4'].includes(headingTag)) return false;
+  if (!headingText || headingText.length < 3) return false;
+  if (/^\/[\w-]+/i.test(headingText.replace(/^"|"$/g, '').trim())) return false;
+  if (!(headingFontSize >= 20)) return false;
+  if (!kickerTag || HEADING_TAGS.has(kickerTag)) return false;
+  if (!['p', 'span', 'div', 'small'].includes(kickerTag)) return false;
+  if (!kickerText || kickerText.length < 2 || kickerText.length > 34) return false;
+  if (/^step\s*\d+/i.test(kickerText) || /^\d{1,2}$/.test(kickerText)) return false;
+
+  const isUppercased = kickerTextTransform === 'uppercase'
+    || (/[A-Z]/.test(kickerText) && !/[a-z]/.test(kickerText));
+  if (!isUppercased) return false;
+  if (!(kickerFontSize > 0 && kickerFontSize <= 14)) return false;
+  const minTrackedSpacing = Math.max(1, kickerFontSize * 0.08);
+  if (!(kickerLetterSpacing >= minTrackedSpacing)) return false;
+  return true;
+}
+
+function collectRepeatedSectionKickerCandidates(doc, getStyle, resolveLetterSpacing) {
+  const candidates = [];
+  for (const heading of doc.querySelectorAll('h2, h3, h4')) {
+    if (heading.closest?.(REPEATED_KICKER_SKIP_SELECTOR)) continue;
+    const kicker = heading.previousElementSibling;
+    if (!kicker || kicker.closest?.(REPEATED_KICKER_SKIP_SELECTOR)) continue;
+    if (isRepeatedKickerCardContext(heading, kicker)) continue;
+
+    const headingStyle = getStyle(heading);
+    const kickerStyle = getStyle(kicker);
+    const headingText = (heading.textContent || '').replace(/\s+/g, ' ').trim();
+    const kickerText = cleanInlineText(kicker) || (kicker.textContent || '').replace(/\s+/g, ' ').trim();
+    const headingFontSize = resolveLetterSpacing(headingStyle.fontSize || '', 16) || parseFloat(headingStyle.fontSize) || 0;
+    const kickerFontSize = resolveLetterSpacing(kickerStyle.fontSize || '', 16) || parseFloat(kickerStyle.fontSize) || 0;
+    const kickerLetterSpacing = resolveLetterSpacing(kickerStyle.letterSpacing || '', kickerFontSize);
+
+    if (!isRepeatedKickerCandidate({
+      headingTag: heading.tagName.toLowerCase(),
+      headingText,
+      headingFontSize,
+      kickerTag: kicker.tagName.toLowerCase(),
+      kickerText,
+      kickerTextTransform: kickerStyle.textTransform || '',
+      kickerFontSize,
+      kickerLetterSpacing,
+    })) {
+      continue;
+    }
+
+    candidates.push({
+      headingTag: heading.tagName.toLowerCase(),
+      headingText: headingText.replace(/^"|"$/g, '').slice(0, 60),
+      kickerText: kickerText.slice(0, 40),
+    });
+  }
+  return candidates;
+}
+
+function checkRepeatedSectionKickersDOM() {
+  const candidates = collectRepeatedSectionKickerCandidates(
+    document,
+    (el) => getComputedStyle(el),
+    (value, fontSize) => resolveLengthPx(value, fontSize) || 0,
+  );
+  return checkRepeatedSectionKickers({ candidates });
+}
+
+function checkElementMotionDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (SAFE_TAGS.has(tag)) return [];
+  const style = getComputedStyle(el);
+  return checkMotion({
+    tag,
+    transitionProperty: style.transitionProperty || '',
+    animationName: style.animationName || '',
+    timingFunctions: [style.animationTimingFunction, style.transitionTimingFunction].filter(Boolean).join(' '),
+    classList: el.getAttribute('class') || '',
+  });
+}
+
+function checkElementGlowDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  const style = getComputedStyle(el);
+  if (!style.boxShadow || style.boxShadow === 'none') return [];
+  // Use parent's background — glow radiates outward, so the surrounding context matters
+  // If resolveBackground returns null (gradient), try to infer from the gradient colors
+  let parentBg = el.parentElement ? resolveBackground(el.parentElement) : resolveBackground(el);
+  if (!parentBg) {
+    // Gradient background — sample its colors to determine if it's dark
+    let cur = el.parentElement;
+    while (cur && cur.nodeType === 1) {
+      const bgImage = getComputedStyle(cur).backgroundImage || '';
+      const gradColors = parseGradientColors(bgImage);
+      if (gradColors.length > 0) {
+        // Average the gradient colors
+        const avg = { r: 0, g: 0, b: 0 };
+        for (const c of gradColors) { avg.r += c.r; avg.g += c.g; avg.b += c.b; }
+        avg.r = Math.round(avg.r / gradColors.length);
+        avg.g = Math.round(avg.g / gradColors.length);
+        avg.b = Math.round(avg.b / gradColors.length);
+        parentBg = avg;
+        break;
+      }
+      cur = cur.parentElement;
+    }
+  }
+  return checkGlow({ tag, boxShadow: style.boxShadow, effectiveBg: parentBg });
+}
+
+function checkElementAIPaletteDOM(el) {
+  const style = getComputedStyle(el);
+  const findings = [];
+
+  // Check gradient backgrounds for purple/violet or cyan
+  const bgImage = style.backgroundImage || '';
+  const gradColors = parseGradientColors(bgImage);
+  for (const c of gradColors) {
+    if (hasChroma(c, 50)) {
+      const hue = getHue(c);
+      if (hue >= 260 && hue <= 310) {
+        findings.push({ id: 'ai-color-palette', snippet: 'Purple/violet gradient background' });
+        break;
+      }
+      if (hue >= 160 && hue <= 200) {
+        findings.push({ id: 'ai-color-palette', snippet: 'Cyan gradient background' });
+        break;
+      }
+    }
+  }
+
+  // Check for neon text (vivid cyan/purple color on dark background)
+  const textColor = parseRgb(style.color);
+  if (textColor && hasChroma(textColor, 80)) {
+    const hue = getHue(textColor);
+    const isAIPalette = (hue >= 160 && hue <= 200) || (hue >= 260 && hue <= 310);
+    if (isAIPalette) {
+      const parentBg = el.parentElement ? resolveBackground(el.parentElement) : null;
+      // Also check gradient parents
+      let effectiveBg = parentBg;
+      if (!effectiveBg) {
+        let cur = el.parentElement;
+        while (cur && cur.nodeType === 1) {
+          const gi = getComputedStyle(cur).backgroundImage || '';
+          const gc = parseGradientColors(gi);
+          if (gc.length > 0) {
+            const avg = { r: 0, g: 0, b: 0 };
+            for (const c of gc) { avg.r += c.r; avg.g += c.g; avg.b += c.b; }
+            avg.r = Math.round(avg.r / gc.length);
+            avg.g = Math.round(avg.g / gc.length);
+            avg.b = Math.round(avg.b / gc.length);
+            effectiveBg = avg;
+            break;
+          }
+          cur = cur.parentElement;
+        }
+      }
+      if (effectiveBg && relativeLuminance(effectiveBg) < 0.1) {
+        const label = hue >= 260 ? 'Purple/violet' : 'Cyan';
+        findings.push({ id: 'ai-color-palette', snippet: `${label} neon text on dark background` });
+      }
+    }
+  }
+
+  return findings;
+}
+
+const QUALITY_TEXT_TAGS = new Set(['p', 'li', 'td', 'th', 'dd', 'blockquote', 'figcaption']);
+
+// Resolve a CSS font-size value to pixels by walking up the parent chain.
+// Browsers resolve em/rem/% to px in getComputedStyle, but jsdom returns the
+// specified value verbatim — so for the Node path we walk parents ourselves.
+function resolveFontSizePx(el, win) {
+  const chain = []; // raw font-size strings, leaf → root
+  let cur = el;
+  while (cur && cur.nodeType === 1) {
+    const fs = (win ? win.getComputedStyle(cur) : getComputedStyle(cur)).fontSize;
+    chain.push(fs || '');
+    cur = cur.parentElement;
+  }
+  // Walk root → leaf, resolving each value relative to its parent context.
+  let px = 16; // root default
+  for (let i = chain.length - 1; i >= 0; i--) {
+    const v = chain[i];
+    if (!v || v === 'inherit') continue;
+    const num = parseFloat(v);
+    if (isNaN(num)) continue;
+    if (v.endsWith('px')) px = num;
+    else if (v.endsWith('rem')) px = num * 16;
+    else if (v.endsWith('em')) px = num * px;
+    else if (v.endsWith('%')) px = (num / 100) * px;
+    else px = num; // unitless — already resolved
+  }
+  return px;
+}
+
+// Resolve a CSS length value (line-height, letter-spacing, etc.) given a
+// known font-size context. Returns null for "normal" / unparseable values.
+function resolveLengthPx(value, fontSizePx) {
+  if (!value || value === 'normal' || value === 'auto' || value === 'inherit') return null;
+  const num = parseFloat(value);
+  if (isNaN(num)) return null;
+  if (value.endsWith('px')) return num;
+  if (value.endsWith('rem')) return num * 16;
+  if (value.endsWith('em')) return num * fontSizePx;
+  if (value.endsWith('%')) return (num / 100) * fontSizePx;
+  // Unitless line-height = multiplier, return px equivalent
+  return num * fontSizePx;
+}
+
+function cssColorIsTransparent(value) {
+  if (!value) return true;
+  const str = String(value).trim().toLowerCase();
+  if (!str || str === 'transparent' || str === 'rgba(0, 0, 0, 0)') return true;
+  const parsed = parseAnyColor(str);
+  if (parsed) return (parsed.a ?? 1) <= 0.05;
+  return /^rgba\(\s*\d+\s*,\s*\d+\s*,\s*\d+\s*,\s*0(?:\.0+)?\s*\)$/.test(str);
+}
+
+function colorsNearlyMatch(a, b) {
+  const ca = parseAnyColor(a);
+  const cb = parseAnyColor(b);
+  if (!ca || !cb) return false;
+  const alphaDelta = Math.abs((ca.a ?? 1) - (cb.a ?? 1));
+  const channelDelta = Math.max(
+    Math.abs(ca.r - cb.r),
+    Math.abs(ca.g - cb.g),
+    Math.abs(ca.b - cb.b),
+  );
+  return alphaDelta <= 0.03 && channelDelta <= 3;
+}
+
+function getComputedStyleFor(win, el) {
+  if (win && typeof win.getComputedStyle === 'function') {
+    try { return win.getComputedStyle(el); } catch {}
+  }
+  if (typeof getComputedStyle === 'function') {
+    try { return getComputedStyle(el); } catch {}
+  }
+  return null;
+}
+
+function hasVisibleBackgroundBoundary(style, el, win) {
+  const bg = style?.backgroundColor || '';
+  if (cssColorIsTransparent(bg)) return false;
+
+  let parent = el?.parentElement || null;
+  while (parent) {
+    const parentStyle = getComputedStyleFor(win, parent);
+    const parentBg = parentStyle?.backgroundColor || '';
+    if (!cssColorIsTransparent(parentBg)) {
+      return !colorsNearlyMatch(bg, parentBg);
+    }
+    parent = parent.parentElement;
+  }
+
+  return true;
+}
+
+const TEXT_EDGE_TAGS = new Set(['A', 'BUTTON', 'CODE', 'DD', 'DT', 'FIGCAPTION', 'H1', 'H2', 'H3', 'H4', 'H5', 'H6', 'LI', 'P', 'PRE', 'SPAN', 'TD', 'TH']);
+
+function hasMeaningfulDirectText(node) {
+  if (!node?.childNodes) return false;
+  for (const child of node.childNodes) {
+    if (child.nodeType === 3 && child.textContent.trim().length > 4) return true;
+  }
+  return false;
+}
+
+function textDescendantsFlushSides(el, rect) {
+  const flush = { top: false, right: false, bottom: false, left: false };
+  if (!rect || !el?.querySelectorAll) return flush;
+  const TEXT_EDGE_THRESHOLD = 4;
+  const candidates = el.querySelectorAll('a, button, code, dd, dt, figcaption, h1, h2, h3, h4, h5, h6, li, p, pre, span, td, th');
+  for (const node of candidates) {
+    if (!TEXT_EDGE_TAGS.has(node.tagName) || !hasMeaningfulDirectText(node)) continue;
+    let nodeRect = null;
+    try { nodeRect = node.getBoundingClientRect(); } catch {}
+    if (!nodeRect || nodeRect.width <= 0 || nodeRect.height <= 0) continue;
+    if (nodeRect.bottom < rect.top || nodeRect.top > rect.bottom || nodeRect.right < rect.left || nodeRect.left > rect.right) continue;
+    if (nodeRect.top - rect.top <= TEXT_EDGE_THRESHOLD) flush.top = true;
+    if (rect.right - nodeRect.right <= TEXT_EDGE_THRESHOLD) flush.right = true;
+    if (rect.bottom - nodeRect.bottom <= TEXT_EDGE_THRESHOLD) flush.bottom = true;
+    if (nodeRect.left - rect.left <= TEXT_EDGE_THRESHOLD) flush.left = true;
+  }
+  return flush;
+}
+
+// Pure quality checks. Most run on computed CSS and DOM-only inputs (work in
+// jsdom and the browser). Two checks (line-length, cramped-padding) gate on
+// element rect dimensions, which jsdom can't compute — pass `rect: null` from
+// the Node adapter to skip those.
+//
+// Both adapters resolve font-size, line-height and letter-spacing to pixels
+// before calling this so the pure function only deals with numbers.
+function checkQuality(opts) {
+  const { el, tag, style, hasDirectText, textLen, fontSize, lineHeightPx, letterSpacingPx, rect, lineMax = 80, viewportWidth = 0, win = null } = opts;
+  const findings = [];
+  // Skip browser extension injected elements
+  const elId = el.id || '';
+  if (elId.startsWith('claude-') || elId.startsWith('cic-')) return findings;
+
+  // --- Line length too long --- (browser-only: needs rect.width)
+  if (rect && hasDirectText && QUALITY_TEXT_TAGS.has(tag) && rect.width > 0 && textLen > lineMax) {
+    const charsPerLine = rect.width / (fontSize * 0.5);
+    if (charsPerLine > lineMax + 5) {
+      findings.push({ id: 'line-length', snippet: `~${Math.round(charsPerLine)} chars/line (aim for <${lineMax})` });
+    }
+  }
+
+  // --- Cramped padding --- (browser-only: needs rect to skip small badges/labels)
+  // Vertical and horizontal thresholds are independent because line-height
+  // already provides built-in vertical breathing room (the line box is taller
+  // than the cap height), but horizontal has no equivalent. Both scale with
+  // font-size — bigger text demands proportionally more padding.
+  //   vertical:   max(4px, fontSize × 0.3)
+  //   horizontal: max(8px, fontSize × 0.5)
+  const isInlineCode = tag === 'code' && !(el.closest && el.closest('pre'));
+  if (!isInlineCode && rect && hasDirectText && textLen > 20 && rect.width > 100 && rect.height > 30) {
+    const borders = {
+      top: parseFloat(style.borderTopWidth) || 0,
+      right: parseFloat(style.borderRightWidth) || 0,
+      bottom: parseFloat(style.borderBottomWidth) || 0,
+      left: parseFloat(style.borderLeftWidth) || 0,
+    };
+    const borderCount = Object.values(borders).filter(w => w > 0).length;
+    const hasBg = hasVisibleBackgroundBoundary(style, el, win);
+    if (borderCount >= 2 || hasBg) {
+      const vPads = [], hPads = [];
+      if (hasBg || borders.top > 0) vPads.push(parseFloat(style.paddingTop) || 0);
+      if (hasBg || borders.bottom > 0) vPads.push(parseFloat(style.paddingBottom) || 0);
+      if (hasBg || borders.left > 0) hPads.push(parseFloat(style.paddingLeft) || 0);
+      if (hasBg || borders.right > 0) hPads.push(parseFloat(style.paddingRight) || 0);
+
+      const vMin = vPads.length ? Math.min(...vPads) : Infinity;
+      const hMin = hPads.length ? Math.min(...hPads) : Infinity;
+      const vThresh = Math.max(4, fontSize * 0.3);
+      const hThresh = Math.max(8, fontSize * 0.5);
+
+      // Emit at most one finding per element — pick whichever axis is worse.
+      if (vMin < vThresh) {
+        findings.push({ id: 'cramped-padding', snippet: `${vMin}px vertical padding (need ≥${vThresh.toFixed(1)}px for ${fontSize}px text)` });
+      } else if (hMin < hThresh) {
+        findings.push({ id: 'cramped-padding', snippet: `${hMin}px horizontal padding (need ≥${hThresh.toFixed(1)}px for ${fontSize}px text)` });
+      }
+    }
+  }
+
+  // --- Flush against a visible boundary ---
+  // Fires when a container has a visible boundary (border, outline, OR a
+  // non-transparent background) AND near-zero padding on the bounded
+  // side(s) AND text-bearing children land flush against the boundary.
+  //
+  // Distinct from cramped-padding: that rule needs the element itself to
+  // have direct text (hasDirectText). This rule targets the OPPOSITE
+  // shape — a container with NO direct text, only children — which is
+  // exactly what cramped-padding misses (a section wrapping a label +
+  // list lands a free pass).
+  //
+  // The classic shape: agent writes `padding: 28px 0 0` shorthand on a
+  // section that also has a border, zeroing horizontal padding so the
+  // text-bearing children touch the side borders. Background and
+  // outline count too: a colored card with zero padding has the same
+  // visual failure mode.
+  {
+    const FLUSH_SKIP_TAGS = new Set(['HTML', 'BODY', 'MAIN', 'HEADER', 'FOOTER', 'NAV', 'ARTICLE', 'ASIDE', 'BUTTON', 'A', 'LABEL', 'SUMMARY', 'CODE', 'PRE', 'INPUT', 'TEXTAREA', 'SELECT', 'FORM', 'FIGURE', 'TABLE', 'TBODY', 'THEAD', 'TR', 'TD', 'TH']);
+    const upperTag = tag ? tag.toUpperCase() : '';
+    const elPosition = style.position || '';
+    if (
+      !FLUSH_SKIP_TAGS.has(upperTag) &&
+      !hasDirectText &&
+      !['fixed', 'absolute'].includes(elPosition) &&
+      el.children && el.children.length > 0
+    ) {
+      const borderW = {
+        top:    parseFloat(style.borderTopWidth)    || 0,
+        right:  parseFloat(style.borderRightWidth)  || 0,
+        bottom: parseFloat(style.borderBottomWidth) || 0,
+        left:   parseFloat(style.borderLeftWidth)   || 0,
+      };
+      const borderVisible = {
+        top:    borderW.top    > 0 && !cssColorIsTransparent(style.borderTopColor),
+        right:  borderW.right  > 0 && !cssColorIsTransparent(style.borderRightColor),
+        bottom: borderW.bottom > 0 && !cssColorIsTransparent(style.borderBottomColor),
+        left:   borderW.left   > 0 && !cssColorIsTransparent(style.borderLeftColor),
+      };
+      // Outline detection. jsdom decomposes `border` shorthand into
+      // border{Top,…}Width/Color but does NOT decompose `outline` —
+      // the longhands come back empty when the value was set via the
+      // shorthand. Fall back to parsing `style.outline` ourselves.
+      let outlineW = parseFloat(style.outlineWidth) || 0;
+      let outlineStyleVal = style.outlineStyle || '';
+      let outlineColorVal = style.outlineColor || '';
+      if (!outlineW && style.outline) {
+        const wMatch = style.outline.match(/(\d+(?:\.\d+)?)\s*px/);
+        if (wMatch) outlineW = parseFloat(wMatch[1]) || 0;
+        if (!outlineStyleVal) {
+          outlineStyleVal = /\b(solid|dashed|dotted|double|groove|ridge|inset|outset)\b/.test(style.outline) ? 'solid' : '';
+        }
+        if (!outlineColorVal) {
+          const cMatch = style.outline.match(/(rgba?\([^)]+\)|#[0-9a-fA-F]{3,8}|[a-zA-Z]+)\s*$/);
+          if (cMatch) outlineColorVal = cMatch[1];
+        }
+      }
+      const outlineVisible = outlineW > 0 && !cssColorIsTransparent(outlineColorVal) && outlineStyleVal && outlineStyleVal !== 'none';
+      const bgVisible = hasVisibleBackgroundBoundary(style, el, win);
+
+      const anyVisible = borderVisible.top || borderVisible.right || borderVisible.bottom || borderVisible.left || outlineVisible || bgVisible;
+      if (anyVisible) {
+        // Resolve padding to px (jsdom returns raw "1.5rem" etc., not the
+        // computed px value; parseFloat would strip the unit and treat
+        // 1.5rem as 1.5px, false-flagging legitimate insets).
+        const pad = {
+          top:    resolveLengthPx(style.paddingTop,    fontSize) ?? 0,
+          right:  resolveLengthPx(style.paddingRight,  fontSize) ?? 0,
+          bottom: resolveLengthPx(style.paddingBottom, fontSize) ?? 0,
+          left:   resolveLengthPx(style.paddingLeft,   fontSize) ?? 0,
+        };
+        const PAD_THRESHOLD = 2;
+        // Children-insulate-this-side: a side is insulated if ANY direct
+        // child has its own padding ≥ 4px on that side. Rationale: in
+        // typical flow, only the first/last (or leftmost/rightmost)
+        // children actually sit at the parent's edges. If even one of
+        // them has its own padding, the visual flush is broken on that
+        // side. Classic example: a column-flow card frame where the
+        // top child (header) has padding-top:12 and the bottom child
+        // (footer) has padding-bottom:8 — the parent's padding:0 doesn't
+        // matter; nothing is actually flush. The `any-child-insulates`
+        // heuristic accepts some false negatives (a card with one heavily
+        // padded middle child won't flag) for far fewer false positives.
+        const CHILD_INSULATE_THRESHOLD = 4;
+        const childrenInsulate = { top: false, right: false, bottom: false, left: false };
+        for (const child of el.children) {
+          let childStyle = getComputedStyleFor(win, child);
+          if (!childStyle) continue;
+          const childPad = {
+            top:    resolveLengthPx(childStyle.paddingTop,    fontSize) ?? 0,
+            right:  resolveLengthPx(childStyle.paddingRight,  fontSize) ?? 0,
+            bottom: resolveLengthPx(childStyle.paddingBottom, fontSize) ?? 0,
+            left:   resolveLengthPx(childStyle.paddingLeft,   fontSize) ?? 0,
+          };
+          const childMargin = {
+            top:    resolveLengthPx(childStyle.marginTop,    fontSize) ?? 0,
+            right:  resolveLengthPx(childStyle.marginRight,  fontSize) ?? 0,
+            bottom: resolveLengthPx(childStyle.marginBottom, fontSize) ?? 0,
+            left:   resolveLengthPx(childStyle.marginLeft,   fontSize) ?? 0,
+          };
+          if (rect && typeof child.getBoundingClientRect === 'function') {
+            try {
+              const childRect = child.getBoundingClientRect();
+              if (childRect && childRect.width > 0 && childRect.height > 0) {
+                if (childRect.top - rect.top >= CHILD_INSULATE_THRESHOLD) childrenInsulate.top = true;
+                if (rect.right - childRect.right >= CHILD_INSULATE_THRESHOLD) childrenInsulate.right = true;
+                if (rect.bottom - childRect.bottom >= CHILD_INSULATE_THRESHOLD) childrenInsulate.bottom = true;
+                if (childRect.left - rect.left >= CHILD_INSULATE_THRESHOLD) childrenInsulate.left = true;
+              }
+            } catch {}
+          }
+          for (const s of ['top', 'right', 'bottom', 'left']) {
+            if (childPad[s] >= CHILD_INSULATE_THRESHOLD || childMargin[s] >= CHILD_INSULATE_THRESHOLD) {
+              childrenInsulate[s] = true;
+            }
+          }
+        }
+
+        const textFlush = rect ? textDescendantsFlushSides(el, rect) : null;
+        const fullBleedBgBand = rect && viewportWidth > 0 && rect.width >= viewportWidth * 0.94 && bgVisible && !outlineVisible;
+        const flushSides = [];
+        for (const side of ['top', 'right', 'bottom', 'left']) {
+          const bgBoundsSide = bgVisible && !(fullBleedBgBand && (side === 'left' || side === 'right'));
+          const sideBounded = borderVisible[side] || outlineVisible || bgBoundsSide;
+          if (sideBounded && pad[side] <= PAD_THRESHOLD && !childrenInsulate[side] && (!textFlush || textFlush[side])) {
+            flushSides.push(side);
+          }
+        }
+
+        if (flushSides.length > 0) {
+          // Confirm at least one direct child has substantial text content
+          // (> 4 chars). Without this, the flush is harmless: e.g. an
+          // image-only card.
+          let hasTextChild = false;
+          for (const child of el.children) {
+            const childText = (child.textContent || '').trim();
+            if (childText.length > 4) { hasTextChild = true; break; }
+          }
+          if (hasTextChild) {
+            const cls = (typeof el.className === 'string' && el.className.trim())
+              ? el.className.trim().split(/\s+/)[0]
+              : '';
+            const boundaryParts = [];
+            const borderSidesVisible = ['top', 'right', 'bottom', 'left'].filter(s => borderVisible[s]);
+            if (borderSidesVisible.length === 4) boundaryParts.push('border');
+            else if (borderSidesVisible.length > 0) boundaryParts.push(`border-${borderSidesVisible.join('/')}`);
+            if (outlineVisible) boundaryParts.push('outline');
+            if (bgVisible) boundaryParts.push('bg');
+            const sidesLabel = flushSides.length === 4 ? 'all sides' : flushSides.join('/');
+            const ident = cls
+              ? `<${tag.toLowerCase()}> "${cls}"`
+              : `<${tag.toLowerCase()}>`;
+            findings.push({
+              id: 'cramped-padding',
+              snippet: `${ident}: children flush against ${boundaryParts.join('+')} on ${sidesLabel} (no inset)`,
+            });
+          }
+        }
+      }
+    }
+  }
+
+  // --- Body text touching viewport edge --- (browser-only: needs rect)
+  // Catches the failure mode where the agent ships body paragraphs
+  // with NO container providing horizontal padding — text bleeds
+  // directly to the viewport edge. Different from cramped-padding,
+  // which requires a colored/bordered container. Here the failure
+  // is the absence of the container entirely.
+  //
+  // Gate aggressively to avoid false positives:
+  //   - <p> or <li> only (body content; not headings, not nav, not
+  //     wrappers)
+  //   - text > 40 chars (paragraph-like, not a label)
+  //   - rect.width > 50% of viewport (real body, not a pull-quote)
+  //   - rect.left < 16 OR rect.right > viewport - 16 (actually
+  //     touching the edge)
+  //   - not inside <nav> or <header> (those legitimately bleed)
+  //   - element itself has no background-color (intentional full-bleed
+  //     sections set a bg-color and provide their own internal padding)
+  if (rect && hasDirectText && textLen > 40 && ['P', 'LI'].includes(tag.toUpperCase()) && viewportWidth > 0) {
+    const inNavHeader = el.closest && (el.closest('nav') || el.closest('header'));
+    const hasOwnBg = style.backgroundColor && style.backgroundColor !== 'rgba(0, 0, 0, 0)' && style.backgroundColor !== 'transparent';
+    const isPositioned = ['fixed', 'absolute'].includes(style.position || '');
+    const widthRatio = rect.width / viewportWidth;
+    const leftClose = rect.left < 16;
+    const rightClose = rect.right > viewportWidth - 16;
+    if (!inNavHeader && !hasOwnBg && !isPositioned && widthRatio > 0.5 && (leftClose || rightClose)) {
+      const which = leftClose && rightClose
+        ? `left ${Math.round(rect.left)}px / right ${Math.round(viewportWidth - rect.right)}px`
+        : leftClose
+          ? `left ${Math.round(rect.left)}px`
+          : `right ${Math.round(viewportWidth - rect.right)}px`;
+      findings.push({ id: 'body-text-viewport-edge', snippet: `<${tag.toLowerCase()}> with ${textLen}-char body bleeds to viewport edge (${which})` });
+    }
+  }
+
+  // --- Tight line height ---
+  if (hasDirectText && textLen > 50 && !['h1','h2','h3','h4','h5','h6'].includes(tag)) {
+    if (lineHeightPx != null && fontSize > 0) {
+      const ratio = lineHeightPx / fontSize;
+      if (ratio > 0 && ratio < 1.3) {
+        findings.push({ id: 'tight-leading', snippet: `line-height ${ratio.toFixed(2)}x (need >=1.3)` });
+      }
+    }
+  }
+
+  // --- Justified text (without hyphens) ---
+  if (hasDirectText && style.textAlign === 'justify') {
+    const hyphens = style.hyphens || style.webkitHyphens || '';
+    if (hyphens !== 'auto') {
+      findings.push({ id: 'justified-text', snippet: 'text-align: justify without hyphens: auto' });
+    }
+  }
+
+  // --- Tiny body text ---
+  // Only flag actual body content, not UI labels (buttons, tabs, badges, captions, footer text, etc.)
+  if (hasDirectText && textLen > 20 && fontSize < 12) {
+    const skipTags = ['sub', 'sup', 'code', 'kbd', 'samp', 'var', 'caption', 'figcaption'];
+    const inUIContext = el.closest && el.closest('button, a, label, summary, pre, [role="button"], [role="link"], [role="tab"], [role="menuitem"], [role="option"], nav, footer, [aria-hidden="true"], [class*="badge" i], [class*="caption" i], [class*="chip" i], [class*="code" i], [class*="console" i], [class*="diff" i], [class*="label" i], [class*="meta" i], [class*="mock" i], [class*="pill" i], [class*="preview" i], [class*="tag" i], [class*="terminal" i], [class*="writes" i]');
+    const isUppercase = style.textTransform === 'uppercase';
+    if (!skipTags.includes(tag) && !inUIContext && !isUppercase) {
+      findings.push({ id: 'tiny-text', snippet: `${fontSize}px body text` });
+    }
+  }
+
+  // --- All-caps body text ---
+  if (hasDirectText && textLen > 30 && style.textTransform === 'uppercase') {
+    if (!['h1','h2','h3','h4','h5','h6'].includes(tag)) {
+      findings.push({ id: 'all-caps-body', snippet: `text-transform: uppercase on ${textLen} chars of body text` });
+    }
+  }
+
+  // --- Wide letter spacing on body text ---
+  if (hasDirectText && textLen > 20 && style.textTransform !== 'uppercase') {
+    if (letterSpacingPx != null && letterSpacingPx > 0 && fontSize > 0) {
+      const trackingEm = letterSpacingPx / fontSize;
+      if (trackingEm > 0.05) {
+        findings.push({ id: 'wide-tracking', snippet: `letter-spacing: ${trackingEm.toFixed(2)}em on body text` });
+      }
+    }
+  }
+
+  // --- Crushed letter spacing (mirror of wide-tracking) ---
+  // Tracking pulled tighter than ~-0.05em crushes characters into each other.
+  // Optical tightening that display type legitimately wants (around -0.02em)
+  // stays well above this floor.
+  if (hasDirectText && textLen > 20 && fontSize > 0) {
+    if (letterSpacingPx != null && letterSpacingPx < 0) {
+      const trackingEm = letterSpacingPx / fontSize;
+      if (trackingEm <= -0.05) {
+        const excerpt = (el.textContent || '').trim().replace(/\s+/g, ' ').slice(0, 40);
+        findings.push({ id: 'extreme-negative-tracking', snippet: `letter-spacing: ${trackingEm.toFixed(2)}em — "${excerpt}"` });
+      }
+    }
+  }
+
+  return findings;
+}
+
+function checkElementQualityDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  const style = getComputedStyle(el);
+  const hasDirectText = [...el.childNodes].some(n => n.nodeType === 3 && n.textContent.trim().length > 10);
+  const textLen = el.textContent?.trim().length || 0;
+  // Browser getComputedStyle resolves everything to px — direct parseFloat
+  // works.
+  const fontSize = parseFloat(style.fontSize) || 16;
+  const lineHeightPx = resolveLengthPx(style.lineHeight, fontSize);
+  const letterSpacingPx = resolveLengthPx(style.letterSpacing, fontSize);
+  const rect = el.getBoundingClientRect();
+  const lineMax = (typeof window !== 'undefined' && window.__IMPECCABLE_CONFIG__?.lineLengthMax) || 80;
+  const viewportWidth = (typeof window !== 'undefined' ? window.innerWidth : 0) || 0;
+  return checkQuality({ el, tag, style, hasDirectText, textLen, fontSize, lineHeightPx, letterSpacingPx, rect, lineMax, viewportWidth, win: typeof window !== 'undefined' ? window : null });
+}
+
+// Pure page-level skipped-heading walk. Takes a Document so it works in both
+// the browser and jsdom.
+function checkPageQualityFromDoc(doc) {
+  const findings = [];
+  const headings = doc.querySelectorAll('h1, h2, h3, h4, h5, h6');
+  let prevLevel = 0;
+  let prevText = '';
+  for (const h of headings) {
+    const level = parseInt(h.tagName[1]);
+    const text = (h.textContent || '').trim().replace(/\s+/g, ' ').slice(0, 60);
+    if (prevLevel > 0 && level > prevLevel + 1) {
+      findings.push({
+        id: 'skipped-heading',
+        snippet: `<h${prevLevel}> "${prevText}" followed by <h${level}> "${text}" (missing h${prevLevel + 1})`,
+      });
+    }
+    prevLevel = level;
+    prevText = text;
+  }
+  return findings;
+}
+
+// Browser adapter (returns the legacy { type, detail } shape used by the overlay loop)
+function checkPageQualityDOM() {
+  return checkPageQualityFromDoc(document).map(f => ({ type: f.id, detail: f.snippet }));
+}
+
+// Node adapters — take pre-extracted jsdom computed style
+
+// jsdom doesn't lay out OR resolve em/rem/% to px — so we pre-resolve every
+// CSS length the rule needs ourselves (walking the parent chain for
+// font-size inheritance), and pass `rect: null` to skip the two rules that
+// genuinely need element rects (line-length, cramped-padding).
+function checkElementQuality(el, style, tag, window) {
+  const hasDirectText = [...el.childNodes].some(n => n.nodeType === 3 && n.textContent.trim().length > 10);
+  const textLen = el.textContent?.trim().length || 0;
+  const fontSize = resolveFontSizePx(el, window);
+  const lineHeightPx = resolveLengthPx(style.lineHeight, fontSize);
+  const letterSpacingPx = resolveLengthPx(style.letterSpacing, fontSize);
+  return checkQuality({ el, tag, style, hasDirectText, textLen, fontSize, lineHeightPx, letterSpacingPx, rect: null, win: window });
+}
+
+function checkElementBorders(tag, style, overrides, resolvedRadius) {
+  const sides = ['Top', 'Right', 'Bottom', 'Left'];
+  const widths = {}, colors = {};
+  for (const s of sides) {
+    widths[s] = parseFloat(style[`border${s}Width`]) || 0;
+    colors[s] = style[`border${s}Color`] || '';
+    // jsdom silently drops any border shorthand containing var(), leaving
+    // both width and color empty on the computed style. When the detectHtml
+    // pre-pass pulled a resolved value off the rule, use it to fill in the
+    // missing side so the side-tab check can run. Real browsers resolve
+    // var() natively, so this fallback is a no-op in the browser path.
+    if (widths[s] === 0 && overrides && overrides[s]) {
+      widths[s] = overrides[s].width;
+      colors[s] = overrides[s].color;
+    } else if (colors[s] && colors[s].startsWith('var(') && overrides && overrides[s]) {
+      // Longhand case: jsdom kept the width but left the color as the
+      // literal `var(...)` string. Substitute the resolved color.
+      colors[s] = overrides[s].color;
+    }
+  }
+  // resolvedRadius lets the caller pre-resolve the radius via
+  // resolveBorderRadiusPx so the value survives jsdom 29.1.0's broken
+  // shorthand serialization. Falls back to the computed value for tests
+  // and browser callers that don't pre-resolve.
+  const radius = resolvedRadius != null
+    ? resolvedRadius
+    : (parseFloat(style.borderRadius) || 0);
+  return checkBorders(tag, widths, colors, radius);
+}
+
+function checkElementColors(el, style, tag, window, customPropMap, hasAnchorInheritRule) {
+  const directText = [...el.childNodes].filter(n => n.nodeType === 3).map(n => n.textContent).join('');
+  const hasDirectText = directText.trim().length > 0;
+
+  const effectiveBg = resolveBackground(el, window, customPropMap);
+  // jsdom returns literal "var(--X)" / "oklch(...)" for color, so plain
+  // parseRgb misses Tailwind-tokenized text colors. Resolve through the
+  // customPropMap first; fall back to parseRgb for vanilla rgb() pages.
+  let textColor = customPropMap ? parseColorResolved(style.color, customPropMap) : null;
+  if (!textColor) textColor = parseRgb(style.color);
+
+  // Anchor-inherit FP workaround: jsdom's UA stylesheet has `:link { color:
+  // blue }` at high specificity. The page's `a { color: inherit }` rule
+  // (Tailwind v4 preflight) loses to jsdom even though it WINS in real
+  // browsers (Chrome's UA wraps :link in :where() — zero specificity).
+  // When the page declares the inherit rule AND we see jsdom's default
+  // link blue on an anchor, walk to the nearest non-anchor ancestor and
+  // use its color instead.
+  if (
+    hasAnchorInheritRule &&
+    textColor &&
+    textColor.r === 0 && textColor.g === 0 && textColor.b === 238 &&
+    (tag === 'a' || el.closest?.('a'))
+  ) {
+    let cur = el.parentElement;
+    while (cur && cur.tagName !== 'HTML') {
+      if (cur.tagName !== 'A') {
+        const ps = window.getComputedStyle(cur);
+        const inh = (customPropMap ? parseColorResolved(ps.color, customPropMap) : null) || parseRgb(ps.color);
+        if (inh && !(inh.r === 0 && inh.g === 0 && inh.b === 238)) {
+          textColor = inh;
+          break;
+        }
+      }
+      cur = cur.parentElement;
+    }
+  }
+
+  return checkColors({
+    tag,
+    textColor,
+    bgColor: readOwnBackgroundColor(el, style),
+    effectiveBg,
+    effectiveBgStops: effectiveBg ? null : resolveGradientStops(el, window),
+    fontSize: parseFloat(style.fontSize) || 16,
+    fontWeight: parseInt(style.fontWeight) || 400,
+    hasDirectText,
+    isEmojiOnly: isEmojiOnlyText(directText),
+    bgClip: style.webkitBackgroundClip || style.backgroundClip || '',
+    bgImage: style.backgroundImage || '',
+    classList: el.getAttribute?.('class') || el.className || '',
+  });
+}
+
+function checkElementIconTile(el, tag, window) {
+  if (!HEADING_TAGS.has(tag)) return [];
+  const sibling = el.previousElementSibling;
+  if (!sibling) return [];
+
+  const sibStyle = window.getComputedStyle(sibling);
+  // jsdom doesn't lay out — read explicit pixel dimensions from CSS instead.
+  const sibWidth = parseFloat(sibStyle.width) || 0;
+  const sibHeight = parseFloat(sibStyle.height) || 0;
+
+  const iconChild = sibling.querySelector('svg, i[data-lucide], i[class*="fa-"], i[class*="icon"]');
+  let iconWidth = 0;
+  if (iconChild) {
+    const iconStyle = window.getComputedStyle(iconChild);
+    iconWidth = parseFloat(iconStyle.width) || parseFloat(iconChild.getAttribute('width')) || 0;
+  }
+  // Or: tile contains an emoji/symbol character directly as its only content
+  const sibDirectText = [...sibling.childNodes].filter(n => n.nodeType === 3).map(n => n.textContent).join('');
+  const hasInlineEmojiIcon = sibling.children.length === 0 && isEmojiOnlyText(sibDirectText);
+
+  return checkIconTile({
+    headingTag: tag,
+    headingText: el.textContent || '',
+    headingTop: 0, // jsdom: no layout, skip vertical-stacking gate
+    siblingTag: sibling.tagName.toLowerCase(),
+    siblingWidth: sibWidth,
+    siblingHeight: sibHeight,
+    siblingBottom: 0,
+    siblingBgColor: parseRgb(sibStyle.backgroundColor),
+    siblingBgImage: sibStyle.backgroundImage || '',
+    siblingBorderWidth: parseFloat(sibStyle.borderTopWidth) || 0,
+    siblingBorderRadius: resolveBorderRadiusPx(sibling, sibStyle, sibWidth, window),
+    hasIconChild: !!iconChild || hasInlineEmojiIcon,
+    iconChildWidth: iconWidth,
+  });
+}
+
+function checkElementItalicSerif(el, style, tag) {
+  if (tag !== 'h1' && tag !== 'h2') return [];
+  return checkItalicSerif({
+    tag,
+    fontStyle: style.fontStyle || '',
+    fontFamily: style.fontFamily || '',
+    fontSize: parseFloat(style.fontSize) || 0,
+    headingText: el.textContent || '',
+  });
+}
+
+function checkElementHeroEyebrow(el, style, tag, window, customPropMap) {
+  if (tag !== 'h1') return [];
+  const sibling = el.previousElementSibling;
+  if (!sibling) return [];
+  const sibStyle = window.getComputedStyle(sibling);
+  // Resolve Tailwind v4 CSS-variable wrappers (font-weight:var(--font-weight-bold)
+  // etc.) before parsing. jsdom returns these verbatim from getComputedStyle;
+  // without resolution every style-based gate fails silently on Tailwind v4 builds.
+  const fontSizeRaw = customPropMap ? resolveVarRefs(sibStyle.fontSize, customPropMap) : sibStyle.fontSize;
+  const fontWeightRaw = customPropMap ? resolveVarRefs(sibStyle.fontWeight, customPropMap) : sibStyle.fontWeight;
+  const letterSpacingRaw = customPropMap ? resolveVarRefs(sibStyle.letterSpacing, customPropMap) : sibStyle.letterSpacing;
+  const colorRaw = customPropMap ? resolveVarRefs(sibStyle.color, customPropMap) : sibStyle.color;
+  const headingFontSizeRaw = customPropMap ? resolveVarRefs(style.fontSize, customPropMap) : style.fontSize;
+  const siblingFontSize = parseFloat(fontSizeRaw) || 0;
+  // resolveLengthPx returns null for 'normal' / 'auto'; coerce to 0 so the
+  // gate falls through cleanly. jsdom returns letter-spacing verbatim
+  // (e.g. '0.15em'), unlike real browsers, so this conversion is required.
+  return checkHeroEyebrow({
+    headingTag: tag,
+    headingText: el.textContent || '',
+    headingFontSize: parseFloat(headingFontSizeRaw) || 0,
+    siblingTag: sibling.tagName.toLowerCase(),
+    siblingText: sibling.textContent || '',
+    siblingTextTransform: sibStyle.textTransform || '',
+    siblingFontSize,
+    siblingLetterSpacing: resolveLengthPx(letterSpacingRaw, siblingFontSize) || 0,
+    siblingFontWeight: fontWeightRaw || '',
+    siblingColor: colorRaw || '',
+  });
+}
+
+function checkRepeatedSectionKickersFromDoc(doc, win) {
+  const candidates = collectRepeatedSectionKickerCandidates(
+    doc,
+    (el) => win.getComputedStyle(el),
+    (value, fontSize) => resolveLengthPx(value, fontSize) || 0,
+  );
+  return checkRepeatedSectionKickers({ candidates });
+}
+
+function checkElementMotion(tag, style) {
+  return checkMotion({
+    tag,
+    transitionProperty: style.transitionProperty || '',
+    animationName: style.animationName || '',
+    timingFunctions: [style.animationTimingFunction, style.transitionTimingFunction].filter(Boolean).join(' '),
+    classList: '',
+  });
+}
+
+function checkElementGlow(tag, style, effectiveBg) {
+  if (!style.boxShadow || style.boxShadow === 'none') return [];
+  return checkGlow({ tag, boxShadow: style.boxShadow, effectiveBg });
+}
+
+// ─── Section 6: Page-Level Checks ───────────────────────────────────────────
+
+// Browser page-level checks — use document/getComputedStyle globals
+
+function checkTypography() {
+  const findings = [];
+
+  // Walk actual text-bearing elements and tally font usage by *computed style*.
+  // This is much more accurate than scanning CSS rules — it ignores rules that
+  // exist in the stylesheet but apply to nothing (e.g. demo classes showing
+  // anti-patterns), and counts what the user actually sees.
+  const fontUsage = new Map(); // primary font name → count of elements
+  let totalTextElements = 0;
+  for (const el of document.querySelectorAll('p, h1, h2, h3, h4, h5, h6, li, td, th, dd, blockquote, figcaption, a, button, label, span')) {
+    // Skip impeccable's own elements
+    if (el.closest && el.closest('.impeccable-overlay, .impeccable-label, .impeccable-banner, .impeccable-tooltip')) continue;
+    // Only count elements that actually have visible direct text
+    const hasText = [...el.childNodes].some(n => n.nodeType === 3 && n.textContent.trim().length > 0);
+    if (!hasText) continue;
+    const style = getComputedStyle(el);
+    const ff = style.fontFamily;
+    if (!ff) continue;
+    const stack = ff.split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase());
+    const primary = stack.find(f => f && !GENERIC_FONTS.has(f));
+    if (!primary) continue;
+    fontUsage.set(primary, (fontUsage.get(primary) || 0) + 1);
+    totalTextElements++;
+  }
+
+  if (totalTextElements >= 20) {
+    // A font is "primary" if it's used by at least 15% of text elements
+    const PRIMARY_THRESHOLD = 0.15;
+    for (const [font, count] of fontUsage) {
+      const share = count / totalTextElements;
+      if (share < PRIMARY_THRESHOLD) continue;
+      if (!OVERUSED_FONTS.has(font)) continue;
+      if (isBrandFontOnOwnDomain(font)) continue;
+      findings.push({ type: 'overused-font', detail: `Primary font: ${font} (${Math.round(share * 100)}% of text)` });
+    }
+
+    // Single-font check: only one distinct primary font across all text
+    if (fontUsage.size === 1) {
+      const only = [...fontUsage.keys()][0];
+      findings.push({ type: 'single-font', detail: `only font used is ${only}` });
+    }
+  }
+
+  const sizes = new Set();
+  for (const el of document.querySelectorAll('h1,h2,h3,h4,h5,h6,p,span,a,li,td,th,label,button,div')) {
+    const fs = parseFloat(getComputedStyle(el).fontSize);
+    if (fs > 0 && fs < 200) sizes.add(Math.round(fs * 10) / 10);
+  }
+  if (sizes.size >= 3) {
+    const sorted = [...sizes].sort((a, b) => a - b);
+    const ratio = sorted[sorted.length - 1] / sorted[0];
+    if (ratio < 2.0) {
+      findings.push({ type: 'flat-type-hierarchy', detail: `Sizes: ${sorted.map(s => s + 'px').join(', ')} (ratio ${ratio.toFixed(1)}:1)` });
+    }
+  }
+
+  return findings;
+}
+
+function isCardLikeDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (SAFE_TAGS.has(tag) || ['input','select','textarea','img','video','canvas','picture'].includes(tag)) return false;
+  const style = getComputedStyle(el);
+  const cls = el.getAttribute('class') || '';
+  const hasShadow = (style.boxShadow && style.boxShadow !== 'none') || /\bshadow(?:-sm|-md|-lg|-xl|-2xl)?\b/.test(cls);
+  const hasBorder = /\bborder\b/.test(cls);
+  const hasRadius = parseFloat(style.borderRadius) > 0 || /\brounded(?:-sm|-md|-lg|-xl|-2xl|-full)?\b/.test(cls);
+  const hasBg = (style.backgroundColor && style.backgroundColor !== 'rgba(0, 0, 0, 0)') || /\bbg-(?:white|gray-\d+|slate-\d+)\b/.test(cls);
+  return isCardLikeFromProps(hasShadow, hasBorder, hasRadius, hasBg);
+}
+
+function checkLayout() {
+  const findings = [];
+  const flaggedEls = new Set();
+
+  for (const el of document.querySelectorAll('*')) {
+    if (!isCardLikeDOM(el) || flaggedEls.has(el)) continue;
+    const cls = el.getAttribute('class') || '';
+    const style = getComputedStyle(el);
+    if (style.position === 'absolute' || style.position === 'fixed') continue;
+    if (/\b(?:dropdown|popover|tooltip|menu|modal|dialog)\b/i.test(cls)) continue;
+    if ((el.textContent?.trim().length || 0) < 10) continue;
+    const rect = el.getBoundingClientRect();
+    if (rect.width < 50 || rect.height < 30) continue;
+
+    let parent = el.parentElement;
+    while (parent) {
+      if (isCardLikeDOM(parent)) { flaggedEls.add(el); break; }
+      parent = parent.parentElement;
+    }
+  }
+
+  for (const el of flaggedEls) {
+    let isAncestor = false;
+    for (const other of flaggedEls) {
+      if (other !== el && el.contains(other)) { isAncestor = true; break; }
+    }
+    if (!isAncestor) findings.push({ type: 'nested-cards', detail: 'Card inside card', el });
+  }
+
+  return findings;
+}
+
+// Node page-level checks — take document/window as parameters
+
+function checkPageTypography(doc, win) {
+  const findings = [];
+
+  const fonts = new Set();
+  const overusedFound = new Set();
+
+  for (const sheet of doc.styleSheets) {
+    let rules;
+    try { rules = sheet.cssRules || sheet.rules; } catch { continue; }
+    if (!rules) continue;
+    for (const rule of rules) {
+      if (rule.type !== 1) continue;
+      const ff = rule.style?.fontFamily;
+      if (!ff) continue;
+      const stack = ff.split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase());
+      const primary = stack.find(f => f && !GENERIC_FONTS.has(f));
+      if (primary) {
+        fonts.add(primary);
+        if (OVERUSED_FONTS.has(primary)) overusedFound.add(primary);
+      }
+    }
+  }
+
+  // Check Google Fonts links in HTML
+  const html = doc.documentElement?.outerHTML || '';
+  const gfRe = /fonts\.googleapis\.com\/css2?\?family=([^&"'\s]+)/gi;
+  let m;
+  while ((m = gfRe.exec(html)) !== null) {
+    const families = m[1].split('|').map(f => f.split(':')[0].replace(/\+/g, ' ').toLowerCase());
+    for (const f of families) {
+      fonts.add(f);
+      if (OVERUSED_FONTS.has(f)) overusedFound.add(f);
+    }
+  }
+
+  // Also parse raw HTML/style content for font-family (jsdom may not expose all via CSSOM)
+  const ffRe = /font-family\s*:\s*([^;}]+)/gi;
+  let fm;
+  while ((fm = ffRe.exec(html)) !== null) {
+    for (const f of fm[1].split(',').map(f => f.trim().replace(/^['"]|['"]$/g, '').toLowerCase())) {
+      if (f && !GENERIC_FONTS.has(f)) {
+        fonts.add(f);
+        if (OVERUSED_FONTS.has(f)) overusedFound.add(f);
+      }
+    }
+  }
+
+  for (const font of overusedFound) {
+    findings.push({ id: 'overused-font', snippet: `Primary font: ${font}` });
+  }
+
+  // Single font
+  if (fonts.size === 1) {
+    const els = doc.querySelectorAll('*');
+    if (els.length >= 20) {
+      findings.push({ id: 'single-font', snippet: `only font used is ${[...fonts][0]}` });
+    }
+  }
+
+  // Flat type hierarchy
+  const sizes = new Set();
+  const textEls = doc.querySelectorAll('h1, h2, h3, h4, h5, h6, p, span, a, li, td, th, label, button, div');
+  for (const el of textEls) {
+    const fontSize = parseFloat(win.getComputedStyle(el).fontSize);
+    // Filter out sub-8px values (jsdom doesn't resolve relative units properly)
+    if (fontSize >= 8 && fontSize < 200) sizes.add(Math.round(fontSize * 10) / 10);
+  }
+  if (sizes.size >= 3) {
+    const sorted = [...sizes].sort((a, b) => a - b);
+    const ratio = sorted[sorted.length - 1] / sorted[0];
+    if (ratio < 2.0) {
+      findings.push({ id: 'flat-type-hierarchy', snippet: `Sizes: ${sorted.map(s => s + 'px').join(', ')} (ratio ${ratio.toFixed(1)}:1)` });
+    }
+  }
+
+  return findings;
+}
+
+function isCardLike(el, win) {
+  const tag = el.tagName.toLowerCase();
+  if (SAFE_TAGS.has(tag) || ['input', 'select', 'textarea', 'img', 'video', 'canvas', 'picture'].includes(tag)) return false;
+
+  const style = win.getComputedStyle(el);
+  const rawStyle = el.getAttribute?.('style') || '';
+  const cls = el.getAttribute?.('class') || '';
+
+  const hasShadow = (style.boxShadow && style.boxShadow !== 'none') ||
+    /\bshadow(?:-sm|-md|-lg|-xl|-2xl)?\b/.test(cls) || /box-shadow/i.test(rawStyle);
+  const hasBorder = /\bborder\b/.test(cls);
+  const widthPx = parseFloat(style.width) || 0;
+  const hasRadius = resolveBorderRadiusPx(el, style, widthPx, win) > 0 ||
+    /\brounded(?:-sm|-md|-lg|-xl|-2xl|-full)?\b/.test(cls) || /border-radius/i.test(rawStyle);
+  const hasBg = /\bbg-(?:white|gray-\d+|slate-\d+)\b/.test(cls) ||
+    /background(?:-color)?\s*:\s*(?!transparent)/i.test(rawStyle);
+
+  return isCardLikeFromProps(hasShadow, hasBorder, hasRadius, hasBg);
+}
+
+function checkPageLayout(doc, win) {
+  const findings = [];
+
+  // Nested cards
+  const allEls = doc.querySelectorAll('*');
+  const flaggedEls = new Set();
+  for (const el of allEls) {
+    if (!isCardLike(el, win)) continue;
+    if (flaggedEls.has(el)) continue;
+
+    const tag = el.tagName.toLowerCase();
+    const cls = el.getAttribute?.('class') || '';
+    const rawStyle = el.getAttribute?.('style') || '';
+
+    if (['pre', 'code'].includes(tag)) continue;
+    if (/\b(?:absolute|fixed)\b/.test(cls) || /position\s*:\s*(?:absolute|fixed)/i.test(rawStyle)) continue;
+    if ((el.textContent?.trim().length || 0) < 10) continue;
+    if (/\b(?:dropdown|popover|tooltip|menu|modal|dialog)\b/i.test(cls)) continue;
+
+    // Walk up to find card-like ancestor
+    let parent = el.parentElement;
+    while (parent) {
+      if (isCardLike(parent, win)) {
+        flaggedEls.add(el);
+        break;
+      }
+      parent = parent.parentElement;
+    }
+  }
+
+  // Only report innermost nested cards
+  for (const el of flaggedEls) {
+    let isAncestorOfFlagged = false;
+    for (const other of flaggedEls) {
+      if (other !== el && el.contains(other)) {
+        isAncestorOfFlagged = true;
+        break;
+      }
+    }
+    if (!isAncestorOfFlagged) {
+      findings.push({ id: 'nested-cards', snippet: `Card inside card (${el.tagName.toLowerCase()})` });
+    }
+  }
+
+  return findings;
+}
+
+// ─── Cream / beige palette (the default "tasteful" AI surface) ────────────────
+// A warm, lightly-tinted off-white page background — light, with R≥G≥B and a
+// small warm tint (not white, not a strong color). The current reflex surface.
+function isCreamColor(rgb) {
+  if (!rgb) return false;
+  const { r, g, b } = rgb;
+  if (Math.min(r, g, b) < 209) return false;   // must be light
+  if (!(r >= g && g >= b)) return false;        // warm ordering
+  const warmth = r - b;
+  return warmth >= 6 && warmth <= 48;           // tinted, not white, not strong
+}
+
+// Tailwind background utilities that render as a warm off-white surface. The
+// static engine doesn't fetch Tailwind's CSS, so a `bg-amber-50` on <body>
+// resolves to nothing in computed style — catch it from the class list
+// instead. Candidate tokens map to their actual Tailwind hex and are still
+// filtered through isCreamColor, so neutral grays (stone) and over-saturated
+// shades drop out on their own.
+const TAILWIND_BG_HEX = {
+  'bg-amber-50': '#fffbeb', 'bg-amber-100': '#fef3c7',
+  'bg-orange-50': '#fff7ed', 'bg-orange-100': '#ffedd5',
+  'bg-yellow-50': '#fefce8',
+  'bg-stone-50': '#fafaf9', 'bg-stone-100': '#f5f5f4', 'bg-stone-200': '#e7e5e4',
+};
+
+function creamFromClassList(cls) {
+  if (!cls) return null;
+  // Arbitrary value: bg-[#f5f0e6] / bg-[rgb(245_240_230)] (underscores = spaces).
+  const arb = cls.match(/\bbg-\[([^\]]+)\]/);
+  if (arb && isCreamColor(parseAnyColor(arb[1].replace(/_/g, ' ')))) return `bg-[${arb[1]}]`;
+  // Named warm-light utilities.
+  for (const [tok, hex] of Object.entries(TAILWIND_BG_HEX)) {
+    if (new RegExp(`(^|\\s)${tok}($|\\s)`).test(cls) && isCreamColor(parseAnyColor(hex))) return tok;
+  }
+  return null;
+}
+
+function checkCreamPalette(doc, win) {
+  const findings = [];
+  const body = doc.body || (doc.querySelector ? doc.querySelector('body') : null);
+  if (!body) return findings;
+  const html = doc.documentElement;
+  const getCS = (el) => (win ? win.getComputedStyle(el) : getComputedStyle(el));
+
+  // 1. Computed background — covers inline / <style> / linked CSS, and Tailwind
+  //    once it's actually rendered (browser path).
+  let bg = readOwnBackgroundColor(body, getCS(body));
+  if (!bg || bg.a === 0) {
+    if (html) bg = readOwnBackgroundColor(html, getCS(html));
+  }
+  if (isCreamColor(bg)) {
+    findings.push({ id: 'cream-palette', snippet: `cream/beige page background rgb(${bg.r}, ${bg.g}, ${bg.b})` });
+    return findings;
+  }
+
+  // 2. Tailwind class fallback — for the static path, where utility classes
+  //    never resolve to computed CSS.
+  for (const el of [body, html]) {
+    const tok = creamFromClassList(el && el.getAttribute ? el.getAttribute('class') : '');
+    if (tok) {
+      findings.push({ id: 'cream-palette', snippet: `cream/beige page background (Tailwind ${tok})` });
+      break;
+    }
+  }
+  return findings;
+}
+
+// ─── Oversized hero headline ────────────────────────────────────────────────
+// Fires when a *long* headline is set at display size and actually dominates
+// the viewport. A punchy one- or two-word headline at the same size is a
+// legitimate stylistic choice, and a large-but-contained two-line hero should
+// pass too — length and viewport share together are the tell.
+const OVERSIZED_H1_FONT_PX = 72;
+const OVERSIZED_H1_MIN_CHARS = 40;
+const OVERSIZED_H1_MIN_VIEWPORT_HEIGHT_RATIO = 0.28;
+const OVERSIZED_H1_MIN_VIEWPORT_AREA_RATIO = 0.25;
+function checkOversizedH1({ tag, fontSize, headingText, rect = null, viewportWidth = 0, viewportHeight = 0 }) {
+  if (tag !== 'h1') return [];
+  const textLen = headingText.length;
+  if (fontSize >= OVERSIZED_H1_FONT_PX && textLen >= OVERSIZED_H1_MIN_CHARS) {
+    let viewportDetail = '';
+    if (rect && viewportWidth > 0 && viewportHeight > 0) {
+      const heightRatio = rect.height / viewportHeight;
+      const areaRatio = (rect.width * rect.height) / (viewportWidth * viewportHeight);
+      const dominatesViewport = heightRatio >= OVERSIZED_H1_MIN_VIEWPORT_HEIGHT_RATIO
+        || areaRatio >= OVERSIZED_H1_MIN_VIEWPORT_AREA_RATIO;
+      if (!dominatesViewport) return [];
+      viewportDetail = `, ${Math.round(heightRatio * 100)}vh`;
+    }
+    return [{ id: 'oversized-h1', snippet: `${Math.round(fontSize)}px h1, ${textLen} chars${viewportDetail} "${headingText.slice(0, 60)}"` }];
+  }
+  return [];
+}
+
+function checkElementOversizedH1(el, style, tag, window) {
+  if (tag !== 'h1') return [];
+  const fontSize = resolveFontSizePx(el, window);
+  const headingText = (el.textContent || '').trim().replace(/\s+/g, ' ');
+  return checkOversizedH1({ tag, fontSize, headingText });
+}
+
+function checkElementOversizedH1DOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (tag !== 'h1') return [];
+  const style = getComputedStyle(el);
+  const fontSize = parseFloat(style.fontSize) || 0;
+  const headingText = (el.textContent || '').trim().replace(/\s+/g, ' ');
+  const rect = el.getBoundingClientRect();
+  const viewportWidth = (typeof window !== 'undefined' ? window.innerWidth : 0) || 0;
+  const viewportHeight = (typeof window !== 'undefined' ? window.innerHeight : 0) || 0;
+  return checkOversizedH1({ tag, fontSize, headingText, rect, viewportWidth, viewportHeight });
+}
+
+// ─── GPT tell: hairline border + wide diffuse shadow (gated --gpt) ────────────
+const CSS_COLOR_TOKEN_RE = /(?:rgba?|hsla?|oklch|oklab|lab|lch|color)\([^)]*\)|#[0-9a-fA-F]{3,8}\b|\b(?:black|white|transparent|currentcolor)\b/gi;
+
+function shadowLayerAlpha(layer) {
+  CSS_COLOR_TOKEN_RE.lastIndex = 0;
+  const match = CSS_COLOR_TOKEN_RE.exec(layer);
+  if (!match) return 1;
+  if (match[0].toLowerCase() === 'transparent') return 0;
+  const parsed = parseAnyColor(match[0]);
+  return parsed ? (parsed.a ?? 1) : 1;
+}
+
+function shadowMaxBlurPx(boxShadow, { minAlpha = 0 } = {}) {
+  if (!boxShadow || boxShadow === 'none') return 0;
+  let maxBlur = 0;
+  // Split into layers on commas not inside parentheses (rgba(...) etc.).
+  for (const layer of boxShadow.split(/,(?![^()]*\))/)) {
+    if (shadowLayerAlpha(layer) < minAlpha) continue;
+    // Strip colors and keywords (rgba()/hsl()/hex/named/inset/px), leaving the
+    // ordered length tokens: offsetX offsetY blur [spread]. Static jsdom keeps
+    // unitless zeros ("0 0 24px"); browsers normalize to px ("0px 0px 24px") —
+    // both reduce to the same numbers here.
+    const cleaned = layer.replace(CSS_COLOR_TOKEN_RE, ' ').replace(/\b[a-z]+\b/gi, ' ');
+    const nums = [...cleaned.matchAll(/-?\d*\.?\d+/g)].map(m => parseFloat(m[0]));
+    if (nums.length >= 3) maxBlur = Math.max(maxBlur, nums[2]);
+  }
+  return maxBlur;
+}
+
+function cssColorAlpha(value) {
+  if (cssColorIsTransparent(value)) return 0;
+  const parsed = parseAnyColor(value);
+  return parsed ? (parsed.a ?? 1) : 1;
+}
+
+function checkGptThinBorderWideShadow({ borderWidths, borderColors, boxShadow }) {
+  const visibleThinBorders = borderWidths
+    .map((width, index) => ({ width, alpha: cssColorAlpha(borderColors?.[index] || '') }))
+    .filter(({ width, alpha }) => width > 0 && width <= 1.5 && alpha >= 0.28);
+  const maxBorder = Math.max(0, ...visibleThinBorders.map(({ width }) => width));
+  const blur = shadowMaxBlurPx(boxShadow, { minAlpha: 0.12 });
+  if (visibleThinBorders.length >= 2 && blur >= 16) {
+    return [{ id: 'gpt-thin-border-wide-shadow', snippet: `${maxBorder}px border + ${Math.round(blur)}px shadow blur` }];
+  }
+  return [];
+}
+
+function borderWidthsFromStyle(style) {
+  return [
+    parseFloat(style.borderTopWidth) || 0,
+    parseFloat(style.borderRightWidth) || 0,
+    parseFloat(style.borderBottomWidth) || 0,
+    parseFloat(style.borderLeftWidth) || 0,
+  ];
+}
+
+function borderColorsFromStyle(style) {
+  return [
+    style.borderTopColor || '',
+    style.borderRightColor || '',
+    style.borderBottomColor || '',
+    style.borderLeftColor || '',
+  ];
+}
+
+function checkElementGptBorderShadow(el, style) {
+  return checkGptThinBorderWideShadow({ borderWidths: borderWidthsFromStyle(style), borderColors: borderColorsFromStyle(style), boxShadow: style.boxShadow || '' });
+}
+
+function checkElementGptBorderShadowDOM(el) {
+  const style = getComputedStyle(el);
+  return checkGptThinBorderWideShadow({ borderWidths: borderWidthsFromStyle(style), borderColors: borderColorsFromStyle(style), boxShadow: style.boxShadow || '' });
+}
+
+// ─── Clipped overflow container ───────────────────────────────────────────────
+// A clipping container (overflow hidden/clip, not a scroll region) wrapping an
+// absolutely/fixed-positioned descendant clips popovers/menus that must escape.
+function classSelector(el) {
+  const cls = (el.getAttribute ? el.getAttribute('class') : el.className) || '';
+  const tokens = String(cls).trim().split(/\s+/).filter(Boolean);
+  const tag = el.tagName ? el.tagName.toLowerCase() : 'el';
+  return tokens.length ? `${tag}.${tokens.join('.')}` : tag;
+}
+
+function positionedChildIsDecorative(child) {
+  if (!child || typeof child.getAttribute !== 'function') return false;
+  if (child.closest?.('[aria-hidden="true"]')) return true;
+  const role = (child.getAttribute('role') || '').toLowerCase();
+  if (role === 'none' || role === 'presentation') return true;
+  const tag = child.tagName ? child.tagName.toLowerCase() : '';
+  if (['img', 'svg', 'canvas', 'video'].includes(tag)) return true;
+  const ident = `${child.getAttribute('class') || ''} ${child.getAttribute('id') || ''}`;
+  if (
+    /\b(art|bg|background|badge|blob|crop|decor|dot|glow|grain|image|mask|ornament|overlay|photo|scrim|shadow|shine|texture)\b/i.test(ident) &&
+    !positionedChildHasSubstantiveContent(child)
+  ) {
+    return true;
+  }
+  return false;
+}
+
+const POSITIONED_CHILD_INTERACTIVE_SELECTOR = [
+  'a[href]',
+  'button',
+  'input',
+  'select',
+  'summary',
+  'textarea',
+  '[tabindex]:not([tabindex="-1"])',
+  '[role="button"]',
+  '[role="dialog"]',
+  '[role="link"]',
+  '[role="listbox"]',
+  '[role="menu"]',
+  '[role="menuitem"]',
+  '[role="option"]',
+  '[role="tooltip"]',
+].join(',');
+
+function positionedChildHasSubstantiveContent(child) {
+  const text = (child.textContent || '').replace(/\s+/g, ' ').trim();
+  if (text.length > 0) return true;
+  if (typeof child.matches === 'function') {
+    try {
+      if (child.matches(POSITIONED_CHILD_INTERACTIVE_SELECTOR)) return true;
+    } catch {}
+  }
+  if (typeof child.querySelector === 'function') {
+    try {
+      if (child.querySelector(POSITIONED_CHILD_INTERACTIVE_SELECTOR)) return true;
+    } catch {}
+  }
+  return false;
+}
+
+function clippingContainerIsIntentionalViewport(el) {
+  if (!el || typeof el.getAttribute !== 'function') return false;
+  const roleDescription = (el.getAttribute('aria-roledescription') || '').toLowerCase();
+  if (/\b(carousel|slider)\b/.test(roleDescription)) return true;
+  const ident = `${el.getAttribute('class') || ''} ${el.getAttribute('id') || ''}`.toLowerCase();
+  return /\b(carousel|comparison|compare|fisheye|marquee|preview|scroller|slider|slideshow|split|viewport)\b/.test(ident) ||
+    /\b(demo-area|demo-stage|demo-viewport)\b/.test(ident);
+}
+
+function elementRect(el) {
+  if (!el || typeof el.getBoundingClientRect !== 'function') return null;
+  try {
+    const rect = el.getBoundingClientRect();
+    if (!rect) return null;
+    const values = [rect.top, rect.right, rect.bottom, rect.left, rect.width, rect.height];
+    if (!values.every(Number.isFinite)) return null;
+    if (rect.width <= 0 && rect.height <= 0) return null;
+    return rect;
+  } catch {
+    return null;
+  }
+}
+
+function positionedStyleImpliesEscape(style) {
+  const values = [
+    style.top,
+    style.right,
+    style.bottom,
+    style.left,
+    style.inset,
+    style.insetBlock,
+    style.insetInline,
+    style.insetBlockStart,
+    style.insetBlockEnd,
+    style.insetInlineStart,
+    style.insetInlineEnd,
+  ].filter(Boolean).map(value => String(value).trim().toLowerCase());
+  for (const value of values) {
+    if (/(^|[\s(])-+(?:\d|\.)/.test(value)) return true;
+    if (/(^|[\s(])100(?:\.0+)?%/.test(value)) return true;
+  }
+  return false;
+}
+
+function positionedChildEscapesClip(el, child, clipX, clipY) {
+  const parentRect = elementRect(el);
+  const childRect = elementRect(child);
+  if (!parentRect || !childRect) return null;
+  const threshold = 2;
+  return Boolean(
+    (clipX && (childRect.left < parentRect.left - threshold || childRect.right > parentRect.right + threshold)) ||
+    (clipY && (childRect.top < parentRect.top - threshold || childRect.bottom > parentRect.bottom + threshold))
+  );
+}
+
+function checkClippedOverflow(el, style, getStyle) {
+  const clips = (v) => v === 'hidden' || v === 'clip';
+  const scrolls = (v) => v === 'auto' || v === 'scroll';
+  const ox = style.overflowX || '', oy = style.overflowY || '', ov = style.overflow || '';
+  const clipX = clips(ox) || clips(ov);
+  const clipY = clips(oy) || clips(ov);
+  const anyClip = clipX || clipY;
+  const anyScroll = scrolls(ox) || scrolls(oy) || scrolls(ov);
+  if (!anyClip || anyScroll) return [];
+  if (clippingContainerIsIntentionalViewport(el)) return [];
+  if (!el.querySelectorAll) return [];
+  for (const child of el.querySelectorAll('*')) {
+    const childStyle = getStyle(child);
+    const pos = childStyle.position || '';
+    if (pos === 'absolute' || pos === 'fixed') {
+      if (positionedChildIsDecorative(child)) continue;
+      const escapes = positionedChildEscapesClip(el, child, clipX, clipY);
+      if (escapes === false) continue;
+      if (escapes === null && !positionedStyleImpliesEscape(childStyle)) continue;
+      return [{ id: 'clipped-overflow-container', snippet: `${classSelector(el)} clips a positioned child` }];
+    }
+  }
+  return [];
+}
+
+function checkElementClippedOverflow(el, style, tag, window) {
+  return checkClippedOverflow(el, style, (n) => window.getComputedStyle(n));
+}
+
+function checkElementClippedOverflowDOM(el) {
+  const style = getComputedStyle(el);
+  return checkClippedOverflow(el, style, (n) => getComputedStyle(n));
+}
+
+// ─── Text overflow (browser-only: needs scrollWidth/clientWidth) ──────────────
+const TEXT_OVERFLOW_SKIP_TAGS = new Set(['pre', 'code', 'textarea', 'svg', 'canvas', 'select', 'option', 'marquee']);
+
+function metricLengthPx(value, fontSizePx = 16) {
+  if (typeof value === 'number' && Number.isFinite(value)) return value;
+  if (typeof value !== 'string') return null;
+  return resolveLengthPx(value, fontSizePx);
+}
+
+function firstMetricLengthPx(fontSizePx, ...values) {
+  for (const value of values) {
+    const parsed = metricLengthPx(value, fontSizePx);
+    if (parsed !== null) return parsed;
+  }
+  return null;
+}
+
+function expandBoxShorthand(parts) {
+  if (parts.length === 1) return [parts[0], parts[0], parts[0], parts[0]];
+  if (parts.length === 2) return [parts[0], parts[1], parts[0], parts[1]];
+  if (parts.length === 3) return [parts[0], parts[1], parts[2], parts[1]];
+  return [parts[0], parts[1], parts[2], parts[3]];
+}
+
+function clippedByInset(clipPath) {
+  const match = String(clipPath || '').trim().toLowerCase().match(/^inset\s*\(([^)]*)\)$/);
+  if (!match) return false;
+  const beforeRound = match[1].split(/\s+round\s+/)[0].trim();
+  if (!beforeRound) return false;
+  const values = expandBoxShorthand(beforeRound.split(/\s+/).slice(0, 4));
+  const percents = values.map(value => String(value).trim().match(/^(-?\d+(?:\.\d+)?)%$/));
+  if (percents.some(match => !match)) return false;
+  const [top, right, bottom, left] = percents.map(match => parseFloat(match[1]));
+  return top + bottom >= 100 || left + right >= 100;
+}
+
+function clippedByRect(clip) {
+  const match = String(clip || '').trim().toLowerCase().match(/^rect\s*\(([^)]*)\)$/);
+  if (!match) return false;
+  const values = match[1].split(/[,\s]+/).map(value => value.trim()).filter(Boolean);
+  if (values.length !== 4) return false;
+  const [top, right, bottom, left] = values.map(value => metricLengthPx(value, 16));
+  if ([top, right, bottom, left].some(value => value === null)) return false;
+  return bottom <= top || right <= left;
+}
+
+function isScreenReaderOnlyTextStyle(style, metrics = {}) {
+  if (!style) return false;
+  const overflowValues = [style.overflow, style.overflowX, style.overflowY]
+    .map(value => String(value || '').toLowerCase());
+  const clipsOverflow = overflowValues.some(value => value === 'hidden' || value === 'clip');
+
+  const fontSize = metricLengthPx(style.fontSize, 16) || 16;
+  const width = firstMetricLengthPx(fontSize, metrics.width, metrics.clientWidth, style.width, style.inlineSize);
+  const height = firstMetricLengthPx(fontSize, metrics.height, metrics.clientHeight, style.height, style.blockSize);
+  const isTiny = width !== null && height !== null && width <= 2 && height <= 2;
+  const isAbsolutelyHidden = String(style.position || '').toLowerCase() === 'absolute' && isTiny && clipsOverflow;
+
+  const clipPath = String(style.clipPath || style.webkitClipPath || '').trim();
+  const clip = String(style.clip || '').trim();
+  return isAbsolutelyHidden || clippedByInset(clipPath) || clippedByRect(clip);
+}
+
+function isRenderedForBrowserRule(el) {
+  for (let cur = el; cur && cur.nodeType === 1; cur = cur.parentElement) {
+    if (cur.getAttribute?.('aria-hidden') === 'true') return false;
+    const style = getComputedStyle(cur);
+    const visibility = String(style.visibility || '').toLowerCase();
+    if (style.display === 'none' || visibility === 'hidden' || visibility === 'collapse') return false;
+    if ((parseFloat(style.opacity) || 0) <= 0.01) return false;
+    if (String(style.contentVisibility || '').toLowerCase() === 'hidden') return false;
+  }
+  return true;
+}
+
+function checkElementTextOverflowDOM(el) {
+  const tag = el.tagName.toLowerCase();
+  if (TEXT_OVERFLOW_SKIP_TAGS.has(tag)) return [];
+  if (!isRenderedForBrowserRule(el)) return [];
+  // Only the element that actually owns overflowing text — not its ancestors,
+  // which inherit a wider scrollWidth from the spilling descendant.
+  const hasDirectText = [...el.childNodes].some(n => n.nodeType === 3 && n.textContent.trim().length > 0);
+  if (!hasDirectText) return [];
+  const style = getComputedStyle(el);
+  const rect = el.getBoundingClientRect ? el.getBoundingClientRect() : null;
+  if (isScreenReaderOnlyTextStyle(style, {
+    width: rect?.width,
+    height: rect?.height,
+    clientWidth: el.clientWidth,
+    clientHeight: el.clientHeight,
+  })) return [];
+  const isScrollRegion = (s) => /(auto|scroll)/.test(s.overflowX || '') || /(auto|scroll)/.test(s.overflow || '');
+  if (isScrollRegion(style)) return [];
+  // A scrollable ancestor means this overflow is intentional and scrollable.
+  for (let p = el.parentElement; p; p = p.parentElement) {
+    if (isScrollRegion(getComputedStyle(p))) return [];
+  }
+  const delta = el.scrollWidth - el.clientWidth;
+  if (el.clientWidth > 0 && delta >= 16) {
+    return [{ id: 'text-overflow', snippet: `${classSelector(el)} overflows its box by ${Math.round(delta)}px` }];
+  }
+  return [];
+}
+
+export {
+  checkBorders,
+  isEmojiOnlyText,
+  checkColors,
+  isCardLikeFromProps,
+  checkIconTile,
+  resolveSerif,
+  checkItalicSerif,
+  isAccentColor,
+  checkHeroEyebrow,
+  checkRepeatedSectionKickers,
+  checkMotion,
+  checkGlow,
+  checkHtmlPatterns,
+  readOwnBackgroundColor,
+  resolveBackground,
+  resolveGradientStops,
+  parseRadiusToPx,
+  resolveBorderRadiusPx,
+  checkElementBordersDOM,
+  checkElementColorsDOM,
+  checkElementIconTileDOM,
+  checkElementItalicSerifDOM,
+  checkElementHeroEyebrowDOM,
+  buildCustomPropMap,
+  resolveVarRefs,
+  oklchToRgb,
+  parseAnyColor,
+  parseColorResolved,
+  cleanInlineText,
+  isRepeatedKickerCandidate,
+  collectRepeatedSectionKickerCandidates,
+  checkRepeatedSectionKickersDOM,
+  checkElementMotionDOM,
+  checkElementGlowDOM,
+  checkElementAIPaletteDOM,
+  resolveFontSizePx,
+  resolveLengthPx,
+  checkQuality,
+  checkElementQualityDOM,
+  checkPageQualityFromDoc,
+  checkPageQualityDOM,
+  checkElementQuality,
+  checkElementBorders,
+  checkElementColors,
+  checkElementIconTile,
+  checkElementItalicSerif,
+  checkElementHeroEyebrow,
+  checkRepeatedSectionKickersFromDoc,
+  checkElementMotion,
+  checkElementGlow,
+  checkTypography,
+  isCardLikeDOM,
+  checkLayout,
+  checkPageTypography,
+  isCardLike,
+  checkPageLayout,
+  isCreamColor,
+  checkCreamPalette,
+  checkOversizedH1,
+  checkElementOversizedH1,
+  checkElementOversizedH1DOM,
+  shadowMaxBlurPx,
+  checkGptThinBorderWideShadow,
+  checkElementGptBorderShadow,
+  checkElementGptBorderShadowDOM,
+  checkClippedOverflow,
+  checkElementClippedOverflow,
+  checkElementClippedOverflowDOM,
+  isScreenReaderOnlyTextStyle,
+  checkElementTextOverflowDOM,
+};
diff --git a/tools/design-detector/detector/shared/color.mjs b/tools/design-detector/detector/shared/color.mjs
new file mode 100644
index 0000000..3d9a126
--- /dev/null
+++ b/tools/design-detector/detector/shared/color.mjs
@@ -0,0 +1,124 @@
+// ─── Section 2: Color Utilities ─────────────────────────────────────────────
+
+function isNeutralColor(color) {
+  if (!color || color === 'transparent') return true;
+
+  // rgb/rgba — use channel spread. Threshold 30 ≈ 11.7% of the 0–255 range.
+  const rgb = color.match(/rgba?\((\d+),\s*(\d+),\s*(\d+)/);
+  if (rgb) {
+    return (Math.max(+rgb[1], +rgb[2], +rgb[3]) - Math.min(+rgb[1], +rgb[2], +rgb[3])) < 30;
+  }
+
+  // oklch()/lch() — chroma is the second numeric component.
+  // oklch chroma is ~0–0.4 in sRGB gamut; >= 0.02 reads as tinted, not gray.
+  // lch chroma is ~0–150; >= 3 reads as tinted. jsdom emits both formats
+  // literally (it does NOT convert them to rgb).
+  const oklch = color.match(/oklch\(\s*[\d.]+%?\s*([\d.-]+)/i);
+  if (oklch) return parseFloat(oklch[1]) < 0.02;
+  const lch = color.match(/lch\(\s*[\d.]+%?\s*([\d.-]+)/i);
+  if (lch) return parseFloat(lch[1]) < 3;
+
+  // oklab()/lab() — a and b are signed axes; chroma = sqrt(a² + b²).
+  // oklab a/b are ~-0.4..0.4, threshold 0.02. lab a/b are ~-128..127, threshold 3.
+  const oklab = color.match(/oklab\(\s*[\d.]+%?\s*([\d.-]+)\s+([\d.-]+)/i);
+  if (oklab) {
+    const a = parseFloat(oklab[1]), b = parseFloat(oklab[2]);
+    return Math.hypot(a, b) < 0.02;
+  }
+  const lab = color.match(/lab\(\s*[\d.]+%?\s*([\d.-]+)\s+([\d.-]+)/i);
+  if (lab) {
+    const a = parseFloat(lab[1]), b = parseFloat(lab[2]);
+    return Math.hypot(a, b) < 3;
+  }
+
+  // hsl/hsla — saturation is the second numeric component (percent).
+  // Modern jsdom usually converts hsl() to rgb, but handle it directly for
+  // safety across versions and for any engine that preserves the format.
+  const hsl = color.match(/hsla?\(\s*[\d.-]+\s*,?\s*([\d.]+)%/i);
+  if (hsl) return parseFloat(hsl[1]) < 10;
+
+  // hwb(hue whiteness% blackness%) — a pixel is fully gray when
+  // whiteness + blackness >= 100; chroma-like saturation = 1 - (w+b)/100.
+  const hwb = color.match(/hwb\(\s*[\d.-]+\s+([\d.]+)%\s+([\d.]+)%/i);
+  if (hwb) {
+    const w = parseFloat(hwb[1]), b = parseFloat(hwb[2]);
+    return (1 - Math.min(100, w + b) / 100) < 0.1;
+  }
+
+  // Unknown / unrecognized format — err on the side of DETECTING rather
+  // than silently skipping. This is the opposite of the previous default,
+  // which was the root cause of the oklch bug.
+  return false;
+}
+
+function parseRgb(color) {
+  if (!color || color === 'transparent') return null;
+  const m = color.match(/rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*([\d.]+))?\)/);
+  if (!m) return null;
+  return { r: +m[1], g: +m[2], b: +m[3], a: m[4] !== undefined ? +m[4] : 1 };
+}
+
+function relativeLuminance({ r, g, b }) {
+  const [rs, gs, bs] = [r / 255, g / 255, b / 255].map(c =>
+    c <= 0.03928 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4
+  );
+  return 0.2126 * rs + 0.7152 * gs + 0.0722 * bs;
+}
+
+function contrastRatio(c1, c2) {
+  const l1 = relativeLuminance(c1);
+  const l2 = relativeLuminance(c2);
+  return (Math.max(l1, l2) + 0.05) / (Math.min(l1, l2) + 0.05);
+}
+
+function parseGradientColors(bgImage) {
+  if (!bgImage || !bgImage.includes('gradient')) return [];
+  const colors = [];
+  for (const m of bgImage.matchAll(/rgba?\([^)]+\)/g)) {
+    const c = parseRgb(m[0]);
+    if (c) colors.push(c);
+  }
+  for (const m of bgImage.matchAll(/#([0-9a-f]{6}|[0-9a-f]{3})\b/gi)) {
+    const h = m[1];
+    if (h.length === 6) {
+      colors.push({ r: parseInt(h.slice(0,2),16), g: parseInt(h.slice(2,4),16), b: parseInt(h.slice(4,6),16), a: 1 });
+    } else {
+      colors.push({ r: parseInt(h[0]+h[0],16), g: parseInt(h[1]+h[1],16), b: parseInt(h[2]+h[2],16), a: 1 });
+    }
+  }
+  return colors;
+}
+
+function hasChroma(c, threshold = 30) {
+  if (!c) return false;
+  return (Math.max(c.r, c.g, c.b) - Math.min(c.r, c.g, c.b)) >= threshold;
+}
+
+function getHue(c) {
+  if (!c) return 0;
+  const r = c.r / 255, g = c.g / 255, b = c.b / 255;
+  const max = Math.max(r, g, b), min = Math.min(r, g, b);
+  if (max === min) return 0;
+  const d = max - min;
+  let h;
+  if (max === r) h = ((g - b) / d + (g < b ? 6 : 0)) / 6;
+  else if (max === g) h = ((b - r) / d + 2) / 6;
+  else h = ((r - g) / d + 4) / 6;
+  return Math.round(h * 360);
+}
+
+function colorToHex(c) {
+  if (!c) return '?';
+  return '#' + [c.r, c.g, c.b].map(v => v.toString(16).padStart(2, '0')).join('');
+}
+
+export {
+  isNeutralColor,
+  parseRgb,
+  relativeLuminance,
+  contrastRatio,
+  parseGradientColors,
+  hasChroma,
+  getHue,
+  colorToHex,
+};
diff --git a/tools/design-detector/detector/shared/constants.mjs b/tools/design-detector/detector/shared/constants.mjs
new file mode 100644
index 0000000..917cbf5
--- /dev/null
+++ b/tools/design-detector/detector/shared/constants.mjs
@@ -0,0 +1,101 @@
+// ─── Section 1: Constants ───────────────────────────────────────────────────
+
+const SAFE_TAGS = new Set([
+  'blockquote', 'nav', 'a', 'input', 'textarea', 'select',
+  'pre', 'code', 'span', 'th', 'td', 'tr', 'li', 'label',
+  'button', 'hr', 'html', 'head', 'body', 'script', 'style',
+  'link', 'meta', 'title', 'br', 'img', 'svg', 'path', 'circle',
+  'rect', 'line', 'polyline', 'polygon', 'g', 'defs', 'use',
+]);
+
+// Per-check safe-tags override for the border (side-tab / border-accent)
+// rule. We intentionally re-allow <label> here because card-shaped clickable
+// labels (e.g. .checklist-item wrapping a checkbox + content) are one of the
+// canonical side-tab anti-pattern shapes and must be detected. The rule's
+// other preconditions (non-neutral color, width >= 2px on a single side,
+// radius > 0 or width >= 3, element size >= 20x20 in the browser path)
+// already filter out plain inline form labels so this does not introduce
+// false positives. See modern-color-borders.html for the test matrix.
+const BORDER_SAFE_TAGS = new Set(
+  [...SAFE_TAGS].filter(t => t !== 'label')
+);
+
+const OVERUSED_FONTS = new Set([
+  // Older monoculture (still ubiquitous):
+  'inter', 'roboto', 'open sans', 'lato', 'montserrat', 'arial', 'helvetica',
+  // Newer monoculture (the Anthropic-skill / Vercel / GitHub default wave):
+  'fraunces', 'instrument sans', 'instrument serif',
+  'geist', 'geist sans', 'geist mono',
+  'mona sans',
+  'plus jakarta sans', 'space grotesk', 'recoleta',
+]);
+
+// Brand-associated fonts: don't flag these as "overused" on the brand's own domains.
+// Keys are font names, values are arrays of hostname suffixes where the font is allowed.
+const GOOGLE_DOMAINS = [
+  'google.com', 'youtube.com', 'android.com', 'chromium.org',
+  'chrome.com', 'web.dev', 'gstatic.com', 'firebase.google.com',
+];
+const VERCEL_DOMAINS = ['vercel.com', 'nextjs.org', 'v0.app'];
+const GITHUB_DOMAINS = ['github.com', 'githubnext.com'];
+const BRAND_FONT_DOMAINS = {
+  'roboto': GOOGLE_DOMAINS,
+  'google sans': GOOGLE_DOMAINS,
+  'product sans': GOOGLE_DOMAINS,
+  'geist': VERCEL_DOMAINS,
+  'geist sans': VERCEL_DOMAINS,
+  'geist mono': VERCEL_DOMAINS,
+  'mona sans': GITHUB_DOMAINS,
+};
+
+function isBrandFontOnOwnDomain(font) {
+  if (typeof location === 'undefined') return false;
+  const allowed = BRAND_FONT_DOMAINS[font];
+  if (!allowed) return false;
+  const host = location.hostname.toLowerCase();
+  return allowed.some(suffix => host === suffix || host.endsWith('.' + suffix));
+}
+
+const GENERIC_FONTS = new Set([
+  'serif', 'sans-serif', 'monospace', 'cursive', 'fantasy',
+  'system-ui', 'ui-serif', 'ui-sans-serif', 'ui-monospace', 'ui-rounded',
+  '-apple-system', 'blinkmacsystemfont', 'segoe ui',
+  'inherit', 'initial', 'unset', 'revert',
+]);
+
+// WCAG large text thresholds are defined in points: 18pt normal text and
+// 14pt bold text. Browsers expose font-size in CSS pixels at 96px per inch.
+const WCAG_LARGE_TEXT_PX = 18 * (96 / 72);
+const WCAG_LARGE_BOLD_TEXT_PX = 14 * (96 / 72);
+
+// Serif faces that show up in italic-display heroes. The rule also fires when
+// the primary face is unknown but the stack ends in the generic `serif` token,
+// which catches custom/private faces with a serif fallback.
+const KNOWN_SERIF_FONTS = new Set([
+  'fraunces', 'recoleta', 'newsreader', 'playfair display', 'playfair',
+  'cormorant', 'cormorant garamond', 'garamond', 'eb garamond',
+  'tiempos', 'tiempos headline', 'tiempos text',
+  'lora', 'vollkorn', 'spectral',
+  'source serif pro', 'source serif 4', 'source serif',
+  'ibm plex serif', 'merriweather',
+  'libre caslon', 'libre baskerville', 'baskerville',
+  'georgia', 'times new roman', 'times',
+  'dm serif display', 'dm serif text',
+  'instrument serif', 'gt sectra', 'ogg', 'canela',
+  'freight display', 'freight text',
+]);
+
+export {
+  SAFE_TAGS,
+  BORDER_SAFE_TAGS,
+  OVERUSED_FONTS,
+  GOOGLE_DOMAINS,
+  VERCEL_DOMAINS,
+  GITHUB_DOMAINS,
+  BRAND_FONT_DOMAINS,
+  isBrandFontOnOwnDomain,
+  GENERIC_FONTS,
+  WCAG_LARGE_TEXT_PX,
+  WCAG_LARGE_BOLD_TEXT_PX,
+  KNOWN_SERIF_FONTS,
+};
diff --git a/tools/design-detector/detector/shared/inline-ignores.mjs b/tools/design-detector/detector/shared/inline-ignores.mjs
new file mode 100644
index 0000000..e5d64b1
--- /dev/null
+++ b/tools/design-detector/detector/shared/inline-ignores.mjs
@@ -0,0 +1,148 @@
+/**
+ * Inline, in-file ignore directives — eslint-disable-style waivers that live at
+ * the point they apply and travel with the artifact instead of (or alongside)
+ * an ignore in `.impeccable/config.json`.
+ *
+ * A config ignore is the right default for repo-wide policy. This complements it
+ * for the one case config can't cover: a waiver that belongs to a single file and
+ * needs to follow that file when it leaves the repo — a generated/exported
+ * standalone document, an emailed HTML file, a snippet scanned out of context.
+ *
+ * Comment-syntax-agnostic: the directive is a raw token matched anywhere on a
+ * line, so the same marker works across every comment style impeccable scans —
+ * `//`, `/* *\/`, `<!-- -->`, `#`, `{/* *\/}`, `{# #}`. Trailing comment closers
+ * are stripped before the rule list is parsed.
+ *
+ * Syntax (reason optional; eslint `--` or biome `:` separator):
+ *
+ *   impeccable-disable <rule>[, <rule>...] [-- reason]   whole file
+ *   impeccable-disable-line <rule>...      [-- reason]   the same line
+ *   impeccable-disable-next-line <rule>... [-- reason]   the following line
+ *   impeccable-disable                                   bare / `*` = every rule
+ *
+ * Examples:
+ *
+ *   <!-- impeccable-disable overused-font -- exported brand doc, font is first-party -->
+ *   .brand { font-family: Inter; } /* impeccable-disable-line overused-font *\/
+ *   // impeccable-disable-next-line bounce-easing: intentional playful affordance
+ *
+ * Behavior is suppression, for parity with config ignores: a matched directive
+ * drops the finding. The inline reason is self-documenting in the diff; it is not
+ * required and is discarded at scan time (only used here to keep reason words out
+ * of the parsed rule list).
+ */
+
+const DIRECTIVE_RE = /impeccable-(disable-next-line|disable-line|disable)\b[ \t]*([^\n\r]*)/gi;
+
+// Trailing comment closers, so `*/`, `*/}`, `-->`, `*}`, `#}`, `%>`, `}}` don't
+// leak into the rule list. Anchored to end-of-line; the leading `\s*` mops up the
+// space before the closer. `--+>` covers `-->` and any longer dash run.
+const TRAILING_CLOSER_RE = /\s*(?:\*\/\}?|--+>|\*\}|#\}|%>|\}\})\s*$/;
+
+function normalizeRule(token) {
+  return String(token || '').trim().toLowerCase();
+}
+
+// Split the directive remainder into rule tokens, dropping any human reason that
+// follows an eslint-style `--` or biome-style `:` separator. Rule ids only ever
+// contain single hyphens (`overused-font`, `bounce-easing`), so `--` and `:`
+// are unambiguous separators.
+function parseRuleList(remainder) {
+  let text = String(remainder || '').replace(TRAILING_CLOSER_RE, '').trim();
+  // Cut off a human reason at the first `--` (eslint) or `:` (biome) separator.
+  const reasonSep = text.match(/\s*(?:--+|:)\s*/);
+  if (reasonSep) text = text.slice(0, reasonSep.index);
+  const tokens = text.split(/[\s,]+/).map(normalizeRule).filter(Boolean);
+  if (tokens.length === 0 || tokens.includes('*')) return ['*'];
+  return tokens;
+}
+
+function addRules(set, rules) {
+  for (const rule of rules) set.add(rule);
+}
+
+function getSet(map, key) {
+  let set = map.get(key);
+  if (!set) {
+    set = new Set();
+    map.set(key, set);
+  }
+  return set;
+}
+
+/**
+ * Parse every inline ignore directive in a file's raw text.
+ *
+ * Returns sets keyed by the 1-based line the directive *targets* so matching is a
+ * direct lookup:
+ *   - file:     rules disabled for the whole file
+ *   - line:     line -> rules disabled on that exact line (disable-line)
+ *   - nextLine: line -> rules disabled on that line (disable-next-line on line-1)
+ *
+ * `*` in any set means "every rule".
+ */
+function parseInlineIgnores(content) {
+  const result = { file: new Set(), line: new Map(), nextLine: new Map() };
+  const text = typeof content === 'string' ? content : '';
+  // Cheap bail-out: the substring must be present for any directive to exist.
+  // Case-insensitive to match DIRECTIVE_RE's `i` flag (e.g. `Impeccable-Disable`).
+  if (!/impeccable-disable/i.test(text)) return result;
+
+  // Split on `\n` only, exactly as detectText numbers lines, so directive line
+  // keys line up with finding `line` values (incl. on `\r`-only line endings).
+  // The directive regex excludes `\r`, so a trailing `\r` on `\r\n` files is
+  // never captured into the rule list.
+  const lines = text.split('\n');
+  for (let i = 0; i < lines.length; i++) {
+    DIRECTIVE_RE.lastIndex = 0;
+    let m;
+    while ((m = DIRECTIVE_RE.exec(lines[i])) !== null) {
+      const variant = m[1].toLowerCase();
+      const rules = parseRuleList(m[2]);
+      if (variant === 'disable') {
+        addRules(result.file, rules);
+      } else if (variant === 'disable-line') {
+        addRules(getSet(result.line, i + 1), rules);
+      } else {
+        // disable-next-line on line i+1 targets line i+2.
+        addRules(getSet(result.nextLine, i + 2), rules);
+      }
+    }
+  }
+  return result;
+}
+
+function setMatches(set, rule) {
+  return Boolean(set) && (set.has('*') || set.has(rule));
+}
+
+function isInlineIgnored(finding, directives) {
+  const rule = normalizeRule(finding && finding.antipattern);
+  if (!rule) return false;
+  if (setMatches(directives.file, rule)) return true;
+  const line = Number(finding && finding.line) || 0;
+  if (line > 0) {
+    if (setMatches(directives.line.get(line), rule)) return true;
+    if (setMatches(directives.nextLine.get(line), rule)) return true;
+  }
+  return false;
+}
+
+function hasDirectives(directives) {
+  return directives.file.size > 0 || directives.line.size > 0 || directives.nextLine.size > 0;
+}
+
+/**
+ * Drop findings waived by an inline directive in the same file's source text.
+ * Findings without a usable line number (e.g. static-HTML page-level findings)
+ * are only matched by whole-file directives — which is the standalone-document
+ * case this primitive exists for.
+ */
+function applyInlineIgnores(findings, content) {
+  if (!Array.isArray(findings) || findings.length === 0) return findings;
+  const directives = parseInlineIgnores(content);
+  if (!hasDirectives(directives)) return findings;
+  return findings.filter((finding) => !isInlineIgnored(finding, directives));
+}
+
+export { parseInlineIgnores, applyInlineIgnores, isInlineIgnored };
diff --git a/tools/design-detector/detector/shared/page.mjs b/tools/design-detector/detector/shared/page.mjs
new file mode 100644
index 0000000..b0f6e1a
--- /dev/null
+++ b/tools/design-detector/detector/shared/page.mjs
@@ -0,0 +1,7 @@
+/** Check if content looks like a full page (not a component/partial) */
+function isFullPage(content) {
+  const stripped = content.replace(/<!--[\s\S]*?-->/g, '');
+  return /<!doctype\s|<html[\s>]|<head[\s>]/i.test(stripped);
+}
+
+export { isFullPage };
diff --git a/tools/design-detector/lib/design-parser.mjs b/tools/design-detector/lib/design-parser.mjs
new file mode 100644
index 0000000..a4b9e94
--- /dev/null
+++ b/tools/design-detector/lib/design-parser.mjs
@@ -0,0 +1,842 @@
+// Parse a DESIGN.md (Stitch-spec format) into a structured JSON model that
+// the live-mode design-system panel can render. Deterministic, dependency-free.
+//
+// Two-layer: YAML frontmatter (machine-readable tokens) + markdown body
+// (prose with six canonical H2 sections). When frontmatter is present, it's
+// exposed on `model.frontmatter` alongside the prose-scraped sections;
+// consumers can prefer frontmatter values and fall back to prose.
+
+const CANONICAL_SECTIONS = [
+  'Overview',
+  'Colors',
+  'Typography',
+  'Elevation',
+  'Components',
+  "Do's and Don'ts",
+];
+
+// ---------- Frontmatter (Stitch YAML subset) ----------
+
+function parseFrontmatter(md) {
+  const lines = md.split(/\r?\n/);
+  if (lines[0]?.trim() !== '---') return { frontmatter: null, body: md };
+
+  let end = -1;
+  for (let i = 1; i < lines.length; i++) {
+    if (lines[i].trim() === '---') { end = i; break; }
+  }
+  if (end === -1) return { frontmatter: null, body: md };
+
+  const yaml = lines.slice(1, end).join('\n');
+  const body = lines.slice(end + 1).join('\n');
+  try {
+    return { frontmatter: parseYamlSubset(yaml), body };
+  } catch {
+    return { frontmatter: null, body: md };
+  }
+}
+
+// Minimal YAML reader for the Stitch frontmatter subset: scalar maps with
+// one level of nested objects (typography roles, components). Indent-based,
+// 2-space convention. No arrays, no anchors, no multi-line scalars — Stitch's
+// schema doesn't need them and accepting them would require a real YAML
+// dependency we don't want to vendor.
+function parseYamlSubset(yaml) {
+  const lines = yaml.split(/\r?\n/);
+  const root = {};
+  const stack = [{ indent: -1, obj: root }];
+
+  for (const raw of lines) {
+    // Skip blanks and line-only comments. Don't strip inline comments:
+    // unquoted hex values start with `#` and can't be safely distinguished
+    // from a comment after whitespace.
+    if (!raw.trim() || /^\s*#/.test(raw)) continue;
+
+    const indent = raw.match(/^\s*/)[0].length;
+    const content = raw.slice(indent);
+
+    const colonIdx = findTopLevelColon(content);
+    if (colonIdx === -1) continue;
+
+    while (stack.length > 1 && stack[stack.length - 1].indent >= indent) {
+      stack.pop();
+    }
+
+    const key = unquoteYamlKey(content.slice(0, colonIdx).trim());
+    const rest = stripInlineYamlComment(content.slice(colonIdx + 1).trim());
+    const parent = stack[stack.length - 1].obj;
+
+    if (rest === '') {
+      const obj = {};
+      parent[key] = obj;
+      stack.push({ indent, obj });
+    } else {
+      parent[key] = parseScalar(rest);
+    }
+  }
+
+  return root;
+}
+
+function findTopLevelColon(s) {
+  let inQuote = null;
+  for (let i = 0; i < s.length; i++) {
+    const ch = s[i];
+    if (inQuote) {
+      if (ch === inQuote && s[i - 1] !== '\\') inQuote = null;
+    } else if (ch === '"' || ch === "'") {
+      inQuote = ch;
+    } else if (ch === ':') {
+      return i;
+    }
+  }
+  return -1;
+}
+
+function unquoteYamlKey(key) {
+  if ((key.startsWith('"') && key.endsWith('"')) || (key.startsWith("'") && key.endsWith("'"))) {
+    return key.slice(1, -1);
+  }
+  return key;
+}
+
+function stripInlineYamlComment(s) {
+  let inQuote = null;
+  for (let i = 0; i < s.length; i++) {
+    const ch = s[i];
+    if (inQuote) {
+      if (ch === inQuote && s[i - 1] !== '\\') inQuote = null;
+    } else if (ch === '"' || ch === "'") {
+      inQuote = ch;
+    } else if (ch === '#' && i > 0 && /\s/.test(s[i - 1])) {
+      return s.slice(0, i).trimEnd();
+    }
+  }
+  return s;
+}
+
+function parseScalar(raw) {
+  const s = raw.trim();
+  if ((s.startsWith('"') && s.endsWith('"')) || (s.startsWith("'") && s.endsWith("'"))) {
+    return s.slice(1, -1);
+  }
+  if (s === 'true') return true;
+  if (s === 'false') return false;
+  if (s === 'null' || s === '~') return null;
+  if (/^-?\d+$/.test(s)) return Number(s);
+  if (/^-?\d*\.\d+$/.test(s)) return Number(s);
+  return s;
+}
+
+const HEX_RE = /#[0-9a-fA-F]{3,8}\b/g;
+const OKLCH_RE = /oklch\([^)]+\)/gi;
+const RGBA_RE = /rgba?\([^)]+\)/gi;
+const BOX_SHADOW_RE = /(?:box-shadow:\s*)?((?:-?\d[\w\d\s\-.,/()#%]*)+)/;
+const NAMED_RULE_RE = /\*\*(The [^*]+?Rule)\.\*\*\s*(.+)/;
+
+// ---------- Section splitting ----------
+
+function splitSections(md) {
+  const lines = md.split(/\r?\n/);
+  let title = null;
+  const sections = {};
+  let current = null;
+
+  for (const raw of lines) {
+    const line = raw.trimEnd();
+
+    if (!title && line.startsWith('# ') && !line.startsWith('## ')) {
+      title = line.replace(/^#\s+/, '').trim();
+      continue;
+    }
+
+    const h2 = line.match(/^##\s+(?:\d+\.\s*)?([^:\n]+?)(?::\s*(.+))?$/);
+    if (h2) {
+      const rawName = normalizeApostrophes(h2[1].trim());
+      const subtitle = h2[2] ? h2[2].trim() : null;
+      const canonical = matchCanonicalSection(rawName);
+      if (canonical) {
+        current = { name: canonical, subtitle, lines: [] };
+        sections[canonical] = current;
+        continue;
+      }
+      // non-canonical H2 — ignore but stop feeding into current
+      current = null;
+      continue;
+    }
+
+    if (current) current.lines.push(raw);
+  }
+
+  return { title, sections };
+}
+
+function normalizeApostrophes(s) {
+  return s.replace(/[\u2018\u2019]/g, "'");
+}
+
+function matchCanonicalSection(name) {
+  const normalized = normalizeApostrophes(name).toLowerCase();
+  // Exact match first
+  for (const c of CANONICAL_SECTIONS) {
+    if (normalizeApostrophes(c).toLowerCase() === normalized) return c;
+  }
+  // Keyword-contained match: "Overview & Creative North Star" -> "Overview",
+  // "Elevation & Depth" -> "Elevation", etc.
+  for (const c of CANONICAL_SECTIONS) {
+    const key = normalizeApostrophes(c).toLowerCase();
+    const pattern = new RegExp(`\\b${key.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')}\\b`);
+    if (pattern.test(normalized)) return c;
+  }
+  return null;
+}
+
+// ---------- Subsection splitting (inside a canonical section) ----------
+
+function splitSubsections(lines) {
+  const subs = [];
+  let current = { name: null, lines: [] };
+  subs.push(current);
+
+  for (const raw of lines) {
+    const h3 = raw.match(/^###\s+(.+?)\s*$/);
+    if (h3) {
+      current = { name: h3[1].trim(), lines: [] };
+      subs.push(current);
+      continue;
+    }
+    current.lines.push(raw);
+  }
+
+  return subs;
+}
+
+// ---------- Generic helpers ----------
+
+function collectParagraphs(lines) {
+  const paragraphs = [];
+  let buf = [];
+  const flush = () => {
+    if (buf.length) {
+      paragraphs.push(buf.join(' ').trim());
+      buf = [];
+    }
+  };
+  for (const raw of lines) {
+    const trimmed = raw.trim();
+    if (trimmed === '') { flush(); continue; }
+    // Horizontal rules (---, ***) and headings/bullets end a paragraph.
+    if (/^(?:-{3,}|\*{3,}|_{3,})$/.test(trimmed)) { flush(); continue; }
+    if (raw.startsWith('#') || raw.match(/^[-*]\s/)) { flush(); continue; }
+    buf.push(trimmed);
+  }
+  flush();
+  return paragraphs.filter(Boolean);
+}
+
+function collectBullets(lines) {
+  const bullets = [];
+  let current = null;
+  for (const raw of lines) {
+    const m = raw.match(/^\s*[-*]\s+(.+)$/);
+    if (m) {
+      if (current) bullets.push(current);
+      current = m[1];
+      continue;
+    }
+    // continuation of a bullet (indented line)
+    if (current && raw.match(/^\s{2,}\S/)) {
+      current += ' ' + raw.trim();
+      continue;
+    }
+    // blank line ends a bullet
+    if (raw.trim() === '' && current) {
+      bullets.push(current);
+      current = null;
+    }
+  }
+  if (current) bullets.push(current);
+  return bullets;
+}
+
+function stripBold(s) {
+  return s.replace(/\*\*(.+?)\*\*/g, '$1');
+}
+
+function extractNamedRules(lines) {
+  const rules = [];
+  const seen = new Set();
+
+  // Style A (Impeccable): "**The X Rule.** body body body" — can span lines.
+  const joined = lines.join('\n');
+  const inlineStart = /\*\*(The [^*]+?Rule)\.\*\*/g;
+  const inlineMatches = [];
+  let m;
+  while ((m = inlineStart.exec(joined)) !== null) {
+    inlineMatches.push({ name: m[1], start: m.index, end: inlineStart.lastIndex });
+  }
+  for (let i = 0; i < inlineMatches.length; i++) {
+    const mm = inlineMatches[i];
+    const bodyEnd = i + 1 < inlineMatches.length ? inlineMatches[i + 1].start : joined.length;
+    const body = joined
+      .slice(mm.end, bodyEnd)
+      .replace(/\n##[^\n]*$/s, '')
+      .replace(/\n###[^\n]*$/s, '')
+      .trim();
+    const name = stripBold(mm.name).trim();
+    seen.add(name.toLowerCase());
+    rules.push({ name, body: stripBold(body) });
+  }
+
+  // Style B (Stitch): `### The "X" Rule` or `### The X Fallback`, body is the
+  // bullets/paragraphs until the next heading. Accept Rule / Fallback / Principle.
+  for (let i = 0; i < lines.length; i++) {
+    const h3 = lines[i].match(/^###\s+(.+?)\s*$/);
+    if (!h3) continue;
+    const headerName = stripBold(h3[1]).replace(/["“”]/g, '').trim();
+    if (!/^The\b.*\b(Rule|Fallback|Principle)\b/i.test(headerName)) continue;
+    if (seen.has(headerName.toLowerCase())) continue;
+
+    const bodyLines = [];
+    for (let j = i + 1; j < lines.length; j++) {
+      if (/^##\s|^###\s/.test(lines[j])) break;
+      bodyLines.push(lines[j]);
+    }
+    const body = stripBold(bodyLines.join('\n').replace(/\n+/g, ' ')).trim();
+    if (body) {
+      seen.add(headerName.toLowerCase());
+      rules.push({ name: headerName, body });
+    }
+  }
+
+  // Style C (Stitch bullet form): "*   **The Layering Principle:** body"
+  // Colon/period lives inside the bold, so match "**...**" then inspect.
+  for (const b of collectBullets(lines)) {
+    const mm = b.match(/^\*\*([^*]+?)\*\*\s*(.+)$/);
+    if (!mm) continue;
+    const nameRaw = mm[1].replace(/[.:]\s*$/, '').replace(/["“”]/g, '').trim();
+    if (!/^The\b.+\b(Rule|Fallback|Principle)$/i.test(nameRaw)) continue;
+    if (seen.has(nameRaw.toLowerCase())) continue;
+    seen.add(nameRaw.toLowerCase());
+    rules.push({ name: nameRaw, body: stripBold(mm[2]).trim() });
+  }
+
+  return rules;
+}
+
+// ---------- Per-section extractors ----------
+
+function extractOverview(section) {
+  if (!section) return null;
+  const text = section.lines.join('\n');
+  const northStar = text.match(/\*\*Creative North Star:\s*"([^"]+)"\*\*/);
+  const keyChars = [];
+  const keyCharMatch = text.match(/\*\*Key Characteristics:\*\*\s*\n([\s\S]+?)(?:\n##|\n###|$)/);
+  if (keyCharMatch) {
+    for (const line of keyCharMatch[1].split('\n')) {
+      const m = line.match(/^\s*[-*]\s+(.+)$/);
+      if (m) keyChars.push(stripBold(m[1].trim()));
+    }
+  }
+
+  // Philosophy paragraphs: everything that isn't a rule header or key-char block
+  const paragraphs = collectParagraphs(section.lines).filter(
+    (p) =>
+      !p.startsWith('**Creative North Star') &&
+      !p.startsWith('**Key Characteristics')
+  );
+
+  return {
+    subtitle: section.subtitle,
+    creativeNorthStar: northStar ? northStar[1] : null,
+    philosophy: paragraphs,
+    keyCharacteristics: keyChars,
+  };
+}
+
+function extractColors(section) {
+  if (!section) return null;
+  const subs = splitSubsections(section.lines);
+
+  const description = collectParagraphs(subs[0].lines).join(' ');
+  const groups = [];
+  const ROLE_KEYWORDS = /^(primary|secondary|tertiary|neutral|accent)\b/i;
+
+  for (const sub of subs.slice(1)) {
+    if (!sub.name || /Named Rules?/i.test(sub.name) || /^The\s/i.test(sub.name)) continue;
+
+    const bullets = collectBullets(sub.lines);
+    const parsed = bullets.map((b) => parseColorBullet(b)).filter(Boolean);
+    if (parsed.length === 0) continue;
+
+    // If every bullet starts with a role keyword (Primary/Secondary/...), promote
+    // each bullet to its own group. Otherwise keep the subsection as the group.
+    const allRoleBullets =
+      parsed.length > 0 && parsed.every((p) => p.name && ROLE_KEYWORDS.test(p.name));
+
+    if (allRoleBullets) {
+      for (const p of parsed) {
+        groups.push({ role: p.name, colors: [p] });
+      }
+    } else {
+      groups.push({ role: sub.name, colors: parsed });
+    }
+  }
+
+  // If the Colors section has no subsections at all (unlikely), fall back to
+  // scanning the whole section as a flat bullet list.
+  if (groups.length === 0) {
+    const flat = collectBullets(section.lines)
+      .map((b) => parseColorBullet(b))
+      .filter(Boolean);
+    if (flat.length) {
+      for (const p of flat) {
+        if (p.name && ROLE_KEYWORDS.test(p.name)) {
+          groups.push({ role: p.name, colors: [p] });
+        } else {
+          const fallback = groups.find((g) => g.role === 'Palette');
+          if (fallback) fallback.colors.push(p);
+          else groups.push({ role: 'Palette', colors: [p] });
+        }
+      }
+    }
+  }
+
+  return {
+    subtitle: section.subtitle,
+    description: description || null,
+    groups,
+    rules: extractNamedRules(section.lines),
+  };
+}
+
+function parseColorBullet(bullet) {
+  const text = bullet.trim();
+
+  // Case 1 (Impeccable): **Name** (value-with-maybe-nested-parens): description
+  const bold = text.match(/^\*\*(.+?)\*\*\s*(.*)$/);
+  if (bold && bold[2].startsWith('(')) {
+    const value = extractParenGroup(bold[2]);
+    if (value !== null) {
+      const after = bold[2].slice(value.length + 2).trimStart();
+      if (after.startsWith(':')) {
+        return buildColor(bold[1], value, after.slice(1).trim());
+      }
+    }
+  }
+
+  // Case 2 (Stitch): **Name (values):** description   — value embedded in bold.
+  const stitch = text.match(/^\*\*([^*]+?)\s*\(([^)]+)\):\*\*\s*(.*)$/);
+  if (stitch) {
+    return buildColor(stitch[1].trim(), stitch[2], stitch[3]);
+  }
+
+  // Case 3: bullet without bold, just hex/oklch inside.
+  const values = collectColorValues(text);
+  if (values.length) {
+    return buildColor(null, values.join(' to '), text);
+  }
+  return null;
+}
+
+function extractParenGroup(s) {
+  if (s[0] !== '(') return null;
+  let depth = 0;
+  for (let i = 0; i < s.length; i++) {
+    if (s[i] === '(') depth++;
+    else if (s[i] === ')') {
+      depth--;
+      if (depth === 0) return s.slice(1, i);
+    }
+  }
+  return null;
+}
+
+function buildColor(name, rawValue, description) {
+  const values = collectColorValues(rawValue);
+  const primary = values[0] ?? rawValue.trim();
+  return {
+    name: name ? stripBold(name).trim() : null,
+    value: primary,
+    valueRange: values.length > 1 ? values : null,
+    format: detectFormat(primary),
+    description: stripBold(description || '').trim() || null,
+  };
+}
+
+function collectColorValues(s) {
+  const out = [];
+  s.replace(HEX_RE, (v) => {
+    out.push(v);
+    return v;
+  });
+  s.replace(OKLCH_RE, (v) => {
+    out.push(v);
+    return v;
+  });
+  return out;
+}
+
+function detectFormat(v) {
+  if (!v) return 'unknown';
+  if (v.startsWith('#')) return 'hex';
+  if (/^oklch/i.test(v)) return 'oklch';
+  if (/^rgb/i.test(v)) return 'rgb';
+  return 'unknown';
+}
+
+function scanInlineColors(lines) {
+  const out = [];
+  for (const line of lines) {
+    if (!/^\s*[-*]\s/.test(line)) continue;
+    const trimmed = line.replace(/^\s*[-*]\s+/, '');
+    const color = parseColorBullet(trimmed);
+    if (color) out.push(color);
+  }
+  return out;
+}
+
+function parseStitchInlineGroups(lines) {
+  // Stitch writes: `*   **Primary (`#00478d` to `#005eb8`):** Use for "..."`
+  // Each bullet IS its own role. Group them under the spoken role name.
+  const out = [];
+  for (const line of lines) {
+    if (!/^\s*[-*]\s/.test(line)) continue;
+    const trimmed = line.replace(/^\s*[-*]\s+/, '').trim();
+    const m = trimmed.match(
+      /^\*\*([A-Z][a-zA-Z]+)\s*\(([^)]+)\):\*\*\s*(.*)$/
+    );
+    if (m) {
+      const role = m[1];
+      const color = buildColor(role, m[2], m[3]);
+      out.push({ role, colors: [color] });
+    }
+  }
+  return out;
+}
+
+function extractTypography(section) {
+  if (!section) return null;
+  const text = section.lines.join('\n');
+
+  const fonts = {};
+  // Pattern A: **Display Font:** Family (with fallback)
+  const fontLineRe = /\*\*([\w\s/]+?)Font:\*\*\s*([^\n(]+?)(?:\s*\(with\s+([^)]+)\))?\s*$/gm;
+  let fm;
+  while ((fm = fontLineRe.exec(text)) !== null) {
+    const rawRole = fm[1].trim().toLowerCase().replace(/\s+/g, '-');
+    const role = normalizeFontRole(rawRole) || 'display';
+    fonts[role] = {
+      family: fm[2].trim(),
+      fallback: fm[3] ? fm[3].trim() : null,
+    };
+  }
+
+  // Pattern B (Stitch): *   **Display & Headlines (Noto Serif):** description
+  if (Object.keys(fonts).length === 0) {
+    const stitchRe = /\*\*([\w\s&/]+?)\s*\(([^)]+)\):\*\*\s*(.+)/g;
+    let sm;
+    while ((sm = stitchRe.exec(text)) !== null) {
+      const rawRole = sm[1]
+        .trim()
+        .toLowerCase()
+        .replace(/\s*&\s*/g, '-')
+        .replace(/\s+/g, '-');
+      const role = normalizeFontRole(rawRole) || rawRole;
+      fonts[role] = { family: sm[2].trim(), fallback: null, purpose: sm[3].trim() };
+    }
+  }
+
+  // Character paragraph — either a **Character:** label, or fall back to the
+  // first free paragraph under the section header (Stitch style).
+  const characterMatch = text.match(/\*\*Character:\*\*\s*([^\n]+(?:\n[^\n]+)*?)(?=\n\n|\n###|\n##|$)/);
+  let character = characterMatch ? characterMatch[1].replace(/\n/g, ' ').trim() : null;
+  if (!character) {
+    const paragraphs = collectParagraphs(section.lines).filter(
+      (p) => !/^\*\*[\w\s/&]+Font/i.test(p) && !/^\*\*[\w\s/&]+\([^)]+\)/.test(p)
+    );
+    if (paragraphs.length) character = paragraphs[0];
+  }
+
+  // Hierarchy bullets under ### Hierarchy
+  const subs = splitSubsections(section.lines);
+  let hierarchy = [];
+  const hierSub = subs.find((s) => s.name && /hierarch/i.test(s.name));
+  if (hierSub) {
+    const bullets = collectBullets(hierSub.lines);
+    hierarchy = bullets.map(parseTypeBullet).filter(Boolean);
+  }
+
+  return {
+    subtitle: section.subtitle,
+    fonts,
+    character,
+    hierarchy,
+    rules: extractNamedRules(section.lines),
+  };
+}
+
+function normalizeFontRole(raw) {
+  // Canonical roles the panel cares about: display, body, label, mono.
+  // Stitch often writes compound roles like "display-&-headlines" or "ui-&-body"
+  // — collapse them to the first canonical role present.
+  const tokens = raw.split(/[-/&\s]+/).filter(Boolean);
+  const priority = ['display', 'headline', 'body', 'ui', 'label', 'mono'];
+  const canonical = { headline: 'display', ui: 'body' };
+  for (const p of priority) {
+    if (tokens.includes(p)) return canonical[p] || p;
+  }
+  return null;
+}
+
+function parseTypeBullet(bullet) {
+  // - **Display** (family, weight 300, italic, clamp(...), line-height 1): purpose
+  const m = bullet.match(/^\*\*(.+?)\*\*\s*\(([^)]+)\):\s*(.*)$/);
+  if (!m) return null;
+  const name = m[1].trim();
+  const specs = m[2].split(',').map((s) => s.trim());
+  return {
+    name,
+    specs,
+    purpose: stripBold(m[3] || '').trim() || null,
+  };
+}
+
+function extractElevation(section) {
+  if (!section) return null;
+  const subs = splitSubsections(section.lines);
+
+  const description = collectParagraphs(subs[0].lines).join(' ') || null;
+
+  const shadows = [];
+  const seen = new Set();
+  const dedupe = (entry) => {
+    const key = (entry.name || '') + '::' + entry.value;
+    if (seen.has(key)) return;
+    seen.add(key);
+    shadows.push(entry);
+  };
+
+  for (const b of collectBullets(section.lines)) {
+    const parsed = parseShadowBullet(b);
+    if (parsed) dedupe(parsed);
+  }
+
+  // Fallback: extract shadows written inline in prose. Stitch style is
+  //   "...use an extra-diffused shadow: `box-shadow: 0 12px 40px rgba(...)`."
+  for (const p of collectParagraphs(section.lines)) {
+    for (const inline of extractInlineShadows(p)) dedupe(inline);
+  }
+  for (const b of collectBullets(section.lines)) {
+    for (const inline of extractInlineShadows(b)) dedupe(inline);
+  }
+
+  return {
+    subtitle: section.subtitle,
+    description,
+    shadows,
+    rules: extractNamedRules(section.lines),
+  };
+}
+
+function extractInlineShadows(text) {
+  // Find `box-shadow: ...` anywhere in prose and capture the value. Work on the
+  // raw string so it handles both backtick-fenced and unfenced variants.
+  const out = [];
+  const re = /box-shadow\s*:\s*([^`;\n]+)/gi;
+  let m;
+  while ((m = re.exec(text)) !== null) {
+    const value = m[1].replace(/[`.)]+$/, '').trim();
+    if (!value) continue;
+    // Name heuristic: the noun immediately before the shadow phrase.
+    // e.g. "an extra-diffused shadow: ..." -> "extra-diffused shadow"
+    const before = text.slice(0, m.index);
+    const nameMatch = before.match(/\b([A-Za-z][A-Za-z\- ]{2,40})\s+shadow\b[^A-Za-z0-9]*$/i);
+    let name = null;
+    if (nameMatch) {
+      const stripped = nameMatch[1]
+        .replace(/^(?:use|using|apply|applying|is|are|looks? like)\s+/i, '')
+        .replace(/^(?:a|an|the)\s+/i, '')
+        .trim();
+      if (stripped) {
+        name =
+          stripped.charAt(0).toUpperCase() + stripped.slice(1) + ' shadow';
+      }
+    }
+    out.push({
+      name,
+      value,
+      purpose: null,
+    });
+  }
+  return out;
+}
+
+function parseShadowBullet(bullet) {
+  // - **Name** (`box-shadow: value`): purpose
+  // - **Name** (`value`): purpose
+  // Only accept if the paren content looks like a shadow value (contains px,
+  // rem, rgba, or box-shadow). This filters out `**Rule Name:**` bullets.
+  const m = bullet.match(/^\*\*(.+?)\*\*\s*\(`?([^`]+?)`?\):\s*(.*)$/);
+  if (!m) return null;
+  const rawValue = m[2].replace(/^box-shadow:\s*/i, '').trim();
+  const looksLikeShadow =
+    /box-shadow|rgba?\(|\bpx\b|\brem\b|^-?\d+\s/i.test(rawValue) &&
+    /\d/.test(rawValue);
+  if (!looksLikeShadow) return null;
+  const name = stripBold(m[1]).trim();
+  return {
+    name,
+    value: rawValue,
+    purpose: stripBold(m[3] || '').trim() || null,
+  };
+}
+
+function extractComponents(section) {
+  if (!section) return null;
+  const subs = splitSubsections(section.lines);
+  const components = [];
+
+  for (const sub of subs.slice(1)) {
+    if (!sub.name) continue;
+
+    const bullets = collectBullets(sub.lines);
+    const paragraphs = collectParagraphs(sub.lines);
+
+    const variants = [];
+    const properties = {};
+
+    for (const b of bullets) {
+      // - **Key:** value
+      const m = b.match(/^\*\*(.+?):?\*\*:?\s*(.+)$/);
+      if (m) {
+        const key = stripBold(m[1]).trim();
+        const value = stripBold(m[2]).trim();
+        // Heuristic: "Primary", "Secondary", "Hover", "Focus" etc are variants;
+        // "Shape", "Background", "Padding" are properties.
+        if (/^(primary|secondary|tertiary|ghost|hover|focus|active|disabled|default|error|selected|unselected|state)$/i.test(key.split(/[\s/]/)[0])) {
+          variants.push({ name: key, description: value });
+        } else {
+          properties[key.toLowerCase()] = value;
+        }
+      }
+    }
+
+    components.push({
+      name: sub.name,
+      description: paragraphs.join(' ') || null,
+      properties,
+      variants,
+    });
+  }
+
+  return {
+    subtitle: section.subtitle,
+    components,
+  };
+}
+
+function extractDosDonts(section) {
+  if (!section) return null;
+  const subs = splitSubsections(section.lines);
+  const dos = [];
+  const donts = [];
+
+  for (const sub of subs.slice(1)) {
+    if (!sub.name) continue;
+    const subName = normalizeApostrophes(sub.name);
+    const bullets = collectBullets(sub.lines).map((b) => stripBold(b).trim());
+    if (/^do'?t?:?$/i.test(subName) || /^do:?$/i.test(subName)) {
+      dos.push(...bullets);
+    } else if (/^don'?t:?$/i.test(subName)) {
+      donts.push(...bullets);
+    }
+  }
+
+  // Classify by bullet prefix as a backup (catches loose bullets outside H3 wrappers)
+  for (const b of collectBullets(section.lines)) {
+    const stripped = normalizeApostrophes(stripBold(b).trim());
+    if (/^don'?t\b/i.test(stripped)) {
+      if (!donts.some((d) => normalizeApostrophes(d) === stripped)) donts.push(stripped);
+    } else if (/^do\b/i.test(stripped)) {
+      if (!dos.some((d) => normalizeApostrophes(d) === stripped)) dos.push(stripped);
+    }
+  }
+
+  return { dos, donts };
+}
+
+// ---------- Coverage assessment ----------
+
+function assessCoverage(model) {
+  const report = {};
+
+  report.overview = model.overview
+    ? {
+        northStar: Boolean(model.overview.creativeNorthStar),
+        philosophy: model.overview.philosophy.length > 0,
+        keyCharacteristics: model.overview.keyCharacteristics.length,
+      }
+    : 'missing';
+
+  report.colors = model.colors
+    ? {
+        groups: model.colors.groups.length,
+        totalColors: model.colors.groups.reduce((n, g) => n + g.colors.length, 0),
+        rules: model.colors.rules.length,
+      }
+    : 'missing';
+
+  report.typography = model.typography
+    ? {
+        fonts: Object.keys(model.typography.fonts).length,
+        hierarchyEntries: model.typography.hierarchy.length,
+        character: Boolean(model.typography.character),
+        rules: model.typography.rules.length,
+      }
+    : 'missing';
+
+  report.elevation = model.elevation
+    ? {
+        shadows: model.elevation.shadows.length,
+        rules: model.elevation.rules.length,
+        description: Boolean(model.elevation.description),
+      }
+    : 'missing';
+
+  report.components = model.components
+    ? {
+        count: model.components.components.length,
+        variantTotal: model.components.components.reduce((n, c) => n + c.variants.length, 0),
+      }
+    : 'missing';
+
+  report.dosDonts = model.dosDonts
+    ? {
+        dos: model.dosDonts.dos.length,
+        donts: model.dosDonts.donts.length,
+      }
+    : 'missing';
+
+  return report;
+}
+
+// ---------- Main ----------
+
+export function parseDesignMd(md) {
+  const { frontmatter, body } = parseFrontmatter(md);
+  const { title, sections } = splitSections(body);
+  return {
+    schemaVersion: 2,
+    title,
+    frontmatter,
+    overview: extractOverview(sections['Overview']),
+    colors: extractColors(sections['Colors']),
+    typography: extractTypography(sections['Typography']),
+    elevation: extractElevation(sections['Elevation']),
+    components: extractComponents(sections['Components']),
+    dosDonts: extractDosDonts(sections["Do's and Don'ts"]),
+  };
+}
+
+export { assessCoverage };
diff --git a/tools/design-detector/lib/impeccable-config.mjs b/tools/design-detector/lib/impeccable-config.mjs
new file mode 100644
index 0000000..dc1c3d1
--- /dev/null
+++ b/tools/design-detector/lib/impeccable-config.mjs
@@ -0,0 +1,638 @@
+/**
+ * CLI-side reader/writer for the unified `.impeccable` config.
+ *
+ * The CLI (published to npm) and the skill scripts (bundled into the install)
+ * live in separate trees and cannot share runtime code, so this duplicates a
+ * small slice of skill/scripts/hook-lib.mjs — the config-path layout, detector
+ * ignore semantics, and the `.git/info/exclude` handling. Keep the schema,
+ * ignore filtering, and exclude marker in sync if either side changes.
+ *
+ * Schema (config.json shared / config.local.json gitignored, per-developer):
+ *   {
+ *     "detector": { "ignoreRules": [], "ignoreFiles": [], "ignoreValues": [], "designSystem": { "enabled": true } },
+ *     "hook": { "consent": "accepted" | "declined", ... },
+ *     "updateCheck": bool
+ *   }
+ */
+
+import { existsSync, readFileSync, writeFileSync, mkdirSync, statSync } from 'node:fs';
+import { join, dirname, isAbsolute, relative, resolve, sep } from 'node:path';
+
+export function getConfigPath(root) {
+  return join(root, '.impeccable', 'config.json');
+}
+
+export function getLocalConfigPath(root) {
+  return join(root, '.impeccable', 'config.local.json');
+}
+
+function safeReadJson(filePath) {
+  try {
+    const raw = JSON.parse(readFileSync(filePath, 'utf-8'));
+    return raw && typeof raw === 'object' && !Array.isArray(raw) ? raw : null;
+  } catch {
+    return null;
+  }
+}
+
+function hookSection(raw) {
+  return raw && raw.hook && typeof raw.hook === 'object' && !Array.isArray(raw.hook) ? raw.hook : null;
+}
+
+function detectorSection(raw) {
+  return raw && raw.detector && typeof raw.detector === 'object' && !Array.isArray(raw.detector) ? raw.detector : null;
+}
+
+const DETECTOR_CONFIG_KEYS = new Set(['ignoreRules', 'ignoreFiles', 'ignoreValues', 'designSystem']);
+
+const DEFAULT_DETECTION_CONFIG = Object.freeze({
+  ignoreRules: [],
+  ignoreFiles: [],
+  ignoreValues: [],
+  designSystem: { enabled: true },
+});
+
+function cloneDetectionConfig() {
+  return {
+    ignoreRules: [],
+    ignoreFiles: [],
+    ignoreValues: [],
+    designSystem: { ...DEFAULT_DETECTION_CONFIG.designSystem },
+  };
+}
+
+function cloneRawDetectionConfig() {
+  return {
+    ignoreRules: [],
+    ignoreFiles: [],
+    ignoreValues: [],
+  };
+}
+
+function applyDetectionConfigSource(config, raw) {
+  if (!raw || typeof raw !== 'object') return config;
+  if (raw.designSystem && typeof raw.designSystem === 'object' && !Array.isArray(raw.designSystem)) {
+    config.designSystem = {
+      ...config.designSystem,
+      enabled: raw.designSystem.enabled === false ? false : true,
+    };
+  }
+  if (Array.isArray(raw.ignoreRules)) {
+    config.ignoreRules = uniqueStrings([...config.ignoreRules, ...raw.ignoreRules]);
+  }
+  if (Array.isArray(raw.ignoreFiles)) {
+    config.ignoreFiles = uniqueStrings([...config.ignoreFiles, ...raw.ignoreFiles]);
+  }
+  if (Array.isArray(raw.ignoreValues)) {
+    config.ignoreValues = mergeIgnoreValues(config.ignoreValues, raw.ignoreValues);
+  }
+  return config;
+}
+
+function uniqueStrings(values) {
+  return Array.from(new Set(values.map(String)));
+}
+
+/**
+ * Detector filters shared by `npx impeccable detect` and the design hook.
+ * `hook.enabled` remains hook lifecycle state; manual CLI scans still run when
+ * the hook is disabled, but they honor the same ignore rules and design-system
+ * toggle.
+ */
+export function readDetectionConfig(root) {
+  const config = cloneDetectionConfig();
+  for (const filePath of [getConfigPath(root), getLocalConfigPath(root)]) {
+    const raw = safeReadJson(filePath);
+    // Back-compat: old builds stored detector filters under hook.*.
+    applyDetectionConfigSource(config, hookSection(raw));
+    applyDetectionConfigSource(config, detectorSection(raw));
+  }
+  return config;
+}
+
+export function readRawDetectionConfig(root, opts = {}) {
+  const raw = safeReadJson(opts.local ? getLocalConfigPath(root) : getConfigPath(root));
+  const config = cloneRawDetectionConfig();
+  applyDetectionConfigSource(config, hookSection(raw));
+  applyDetectionConfigSource(config, detectorSection(raw));
+  return config;
+}
+
+export function writeDetectionConfig(root, detectorConfig, opts = {}) {
+  const filePath = opts.local ? getLocalConfigPath(root) : getConfigPath(root);
+  if (opts.local) ensureConfigGitExclude(root);
+  const existing = safeReadJson(filePath) || {};
+  const existingHook = hookSection(existing);
+  const nextHook = stripDetectorKeys(existingHook);
+  const nextDetector = {
+    ...(detectorSection(existing) || {}),
+    ...normalizeDetectionConfigForWrite(detectorConfig),
+  };
+  const next = {
+    ...existing,
+    detector: nextDetector,
+  };
+  if (nextHook && Object.keys(nextHook).length > 0) {
+    next.hook = nextHook;
+  } else {
+    delete next.hook;
+  }
+  mkdirSync(dirname(filePath), { recursive: true });
+  writeFileSync(filePath, `${JSON.stringify(next, null, 2)}\n`);
+  return filePath;
+}
+
+function normalizeDetectionConfigForWrite(config) {
+  const out = {};
+  if (Array.isArray(config?.ignoreRules)) {
+    out.ignoreRules = uniqueStrings(config.ignoreRules.map((rule) => normalizeIgnoreRule(rule)).filter(Boolean));
+  }
+  if (Array.isArray(config?.ignoreFiles)) {
+    out.ignoreFiles = uniqueStrings(config.ignoreFiles.filter(v => typeof v === 'string' && v.trim()).map(v => v.trim()));
+  }
+  out.ignoreValues = normalizeIgnoreValueEntries(config?.ignoreValues || []);
+  if (config?.designSystem && typeof config.designSystem === 'object' && !Array.isArray(config.designSystem)) {
+    out.designSystem = {
+      enabled: config.designSystem.enabled === false ? false : true,
+    };
+  }
+  return out;
+}
+
+function stripDetectorKeys(raw) {
+  if (!raw || typeof raw !== 'object' || Array.isArray(raw)) return null;
+  const out = {};
+  for (const [key, value] of Object.entries(raw)) {
+    if (!DETECTOR_CONFIG_KEYS.has(key)) out[key] = value;
+  }
+  return out;
+}
+
+export function normalizeIgnoreValue(value) {
+  return String(value || '')
+    .trim()
+    .replace(/^["']|["']$/g, '')
+    .replace(/\+/g, ' ')
+    .replace(/\s+/g, ' ')
+    .toLowerCase();
+}
+
+function normalizeIgnoreRule(rule) {
+  return String(rule || '').trim().toLowerCase();
+}
+
+function colorIgnoreKey(value) {
+  const color = parseIgnoreColor(value);
+  if (!color) return '';
+  return `${color.r},${color.g},${color.b},${Math.round(color.a * 255)}`;
+}
+
+function parseIgnoreColor(value) {
+  const text = String(value || '').trim().toLowerCase();
+  if (!text) return null;
+
+  const hex = text.match(/^#([0-9a-f]{3,4}|[0-9a-f]{6}|[0-9a-f]{8})$/i);
+  if (hex) return parseHexIgnoreColor(hex[1]);
+
+  const rgb = text.match(/^rgba?\((.*)\)$/i);
+  if (rgb) {
+    const parts = splitColorArgs(rgb[1]);
+    if (parts.length < 3 || parts.length > 4) return null;
+    const r = parseRgbChannel(parts[0]);
+    const g = parseRgbChannel(parts[1]);
+    const b = parseRgbChannel(parts[2]);
+    const a = parts[3] === undefined ? 1 : parseAlphaChannel(parts[3]);
+    if ([r, g, b, a].some((v) => v === null)) return null;
+    return { r, g, b, a };
+  }
+
+  const hsl = text.match(/^hsla?\((.*)\)$/i);
+  if (hsl) {
+    const parts = splitColorArgs(hsl[1]);
+    if (parts.length < 3 || parts.length > 4) return null;
+    const h = parseHueChannel(parts[0]);
+    const s = parsePercentChannel(parts[1]);
+    const l = parsePercentChannel(parts[2]);
+    const a = parts[3] === undefined ? 1 : parseAlphaChannel(parts[3]);
+    if ([h, s, l, a].some((v) => v === null)) return null;
+    return hslToRgb(h, s, l, a);
+  }
+
+  return null;
+}
+
+function parseHexIgnoreColor(hex) {
+  if (hex.length === 3 || hex.length === 4) {
+    const r = parseInt(hex[0] + hex[0], 16);
+    const g = parseInt(hex[1] + hex[1], 16);
+    const b = parseInt(hex[2] + hex[2], 16);
+    const a = hex.length === 4 ? parseInt(hex[3] + hex[3], 16) / 255 : 1;
+    return { r, g, b, a };
+  }
+  const r = parseInt(hex.slice(0, 2), 16);
+  const g = parseInt(hex.slice(2, 4), 16);
+  const b = parseInt(hex.slice(4, 6), 16);
+  const a = hex.length === 8 ? parseInt(hex.slice(6, 8), 16) / 255 : 1;
+  return { r, g, b, a };
+}
+
+function splitColorArgs(body) {
+  const text = String(body || '').trim();
+  if (!text) return [];
+  if (text.includes(',')) {
+    const parts = text.split(',').map((part) => part.trim()).filter(Boolean);
+    const last = parts[parts.length - 1];
+    if (last && last.includes('/')) {
+      const split = last.split('/').map((part) => part.trim()).filter(Boolean);
+      return [...parts.slice(0, -1), ...split];
+    }
+    return parts;
+  }
+  return text.replace(/\s*\/\s*/g, ' / ').split(/\s+/).filter((part) => part && part !== '/');
+}
+
+function parseRgbChannel(raw) {
+  const text = String(raw || '').trim();
+  const match = text.match(/^(-?\d*\.?\d+)(%)?$/);
+  if (!match) return null;
+  const value = Number.parseFloat(match[1]);
+  if (!Number.isFinite(value)) return null;
+  const scaled = match[2] ? value * 2.55 : value;
+  if (scaled < 0 || scaled > 255) return null;
+  return Math.round(scaled);
+}
+
+function parseAlphaChannel(raw) {
+  const text = String(raw || '').trim();
+  const match = text.match(/^(-?\d*\.?\d+)(%)?$/);
+  if (!match) return null;
+  const value = Number.parseFloat(match[1]);
+  if (!Number.isFinite(value)) return null;
+  const alpha = match[2] ? value / 100 : value;
+  return alpha >= 0 && alpha <= 1 ? alpha : null;
+}
+
+function parseHueChannel(raw) {
+  const text = String(raw || '').trim();
+  const match = text.match(/^(-?\d*\.?\d+)(deg|rad|turn|grad)?$/);
+  if (!match) return null;
+  const value = Number.parseFloat(match[1]);
+  if (!Number.isFinite(value)) return null;
+  const unit = match[2] || 'deg';
+  if (unit === 'turn') return value * 360;
+  if (unit === 'rad') return value * (180 / Math.PI);
+  if (unit === 'grad') return value * 0.9;
+  return value;
+}
+
+function parsePercentChannel(raw) {
+  const text = String(raw || '').trim();
+  const match = text.match(/^(-?\d*\.?\d+)%$/);
+  if (!match) return null;
+  const value = Number.parseFloat(match[1]);
+  if (!Number.isFinite(value)) return null;
+  return value >= 0 && value <= 100 ? value / 100 : null;
+}
+
+function hslToRgb(hue, saturation, lightness, alpha) {
+  const h = (((hue % 360) + 360) % 360) / 360;
+  if (saturation === 0) {
+    const gray = clampByte(Math.round(lightness * 255));
+    return { r: gray, g: gray, b: gray, a: alpha };
+  }
+  const q = lightness < 0.5
+    ? lightness * (1 + saturation)
+    : lightness + saturation - lightness * saturation;
+  const p = 2 * lightness - q;
+  const toRgb = (t) => {
+    let channel = t;
+    if (channel < 0) channel += 1;
+    if (channel > 1) channel -= 1;
+    if (channel < 1 / 6) return p + (q - p) * 6 * channel;
+    if (channel < 1 / 2) return q;
+    if (channel < 2 / 3) return p + (q - p) * (2 / 3 - channel) * 6;
+    return p;
+  };
+  return {
+    r: clampByte(Math.round(toRgb(h + 1 / 3) * 255)),
+    g: clampByte(Math.round(toRgb(h) * 255)),
+    b: clampByte(Math.round(toRgb(h - 1 / 3) * 255)),
+    a: alpha,
+  };
+}
+
+function clampByte(value) {
+  return Math.min(255, Math.max(0, value));
+}
+
+function ignoreValueMatches(rule, entryValue, findingValue) {
+  if (entryValue === findingValue) return true;
+  if (rule !== 'design-system-color') return false;
+  const entryColor = colorIgnoreKey(entryValue);
+  return Boolean(entryColor && entryColor === colorIgnoreKey(findingValue));
+}
+
+export function normalizeIgnoreValueEntries(entries) {
+  if (!Array.isArray(entries)) return [];
+  const out = [];
+  for (const entry of entries) {
+    if (!entry || typeof entry !== 'object') continue;
+    const rule = normalizeIgnoreRule(entry.rule);
+    const value = normalizeIgnoreValue(entry.value);
+    if (!rule || !value) continue;
+    const normalized = { rule, value };
+    const files = uniqueStrings([
+      ...(typeof entry.file === 'string' && entry.file.trim() ? [entry.file.trim()] : []),
+      ...(Array.isArray(entry.files) ? entry.files.filter(v => typeof v === 'string' && v.trim()).map(v => v.trim()) : []),
+    ]);
+    if (files.length > 0) normalized.files = files;
+    if (typeof entry.reason === 'string' && entry.reason.trim()) {
+      normalized.reason = entry.reason.trim();
+    }
+    if (typeof entry.createdAt === 'string' && entry.createdAt.trim()) {
+      normalized.createdAt = entry.createdAt.trim();
+    }
+    out.push(normalized);
+  }
+  return out;
+}
+
+function mergeIgnoreValues(existing, incoming) {
+  const map = new Map();
+  for (const entry of normalizeIgnoreValueEntries(existing)) {
+    map.set(`${entry.rule}\0${entry.value}\0${ignoreValueFilesKey(entry.files)}`, entry);
+  }
+  for (const entry of normalizeIgnoreValueEntries(incoming)) {
+    map.set(`${entry.rule}\0${entry.value}\0${ignoreValueFilesKey(entry.files)}`, entry);
+  }
+  return Array.from(map.values());
+}
+
+function ignoreValueFilesKey(files) {
+  return Array.isArray(files) && files.length > 0 ? files.join('\x1f') : '';
+}
+
+// Glob -> RegExp. Supports `**`, `*`, `?`, and `{a,b}` alternation.
+function globToRegex(glob) {
+  let re = '^';
+  let i = 0;
+  while (i < glob.length) {
+    const c = glob[i];
+    if (c === '*') {
+      if (glob[i + 1] === '*') {
+        re += '.*';
+        i += 2;
+        if (glob[i] === '/') i += 1;
+      } else {
+        re += '[^/]*';
+        i += 1;
+      }
+    } else if (c === '?') {
+      re += '[^/]';
+      i += 1;
+    } else if (c === '{') {
+      const end = glob.indexOf('}', i);
+      if (end === -1) { re += '\\{'; i += 1; continue; }
+      const parts = glob.slice(i + 1, end).split(',').map((p) => p.replace(/[.+^$()|[\]\\]/g, '\\$&'));
+      re += `(?:${parts.join('|')})`;
+      i = end + 1;
+    } else if (/[.+^$()|[\]\\]/.test(c)) {
+      re += `\\${c}`;
+      i += 1;
+    } else {
+      re += c;
+      i += 1;
+    }
+  }
+  re += '$';
+  return new RegExp(re);
+}
+
+export function matchesAnyGlob(filePath, globs) {
+  if (!Array.isArray(globs) || globs.length === 0) return false;
+  const normalized = String(filePath || '').split(sep).join('/');
+  for (const glob of globs) {
+    try {
+      const re = globToRegex(String(glob));
+      if (re.test(normalized)) return true;
+      const base = normalized.split('/').pop();
+      if (re.test(base)) return true;
+    } catch {
+      /* malformed glob, skip */
+    }
+  }
+  return false;
+}
+
+export function shouldIgnoreDetectionFile(filePath, root, config) {
+  const globs = config?.ignoreFiles || [];
+  if (!Array.isArray(globs) || globs.length === 0) return false;
+  const raw = String(filePath || '').trim();
+  if (!raw) return false;
+  if (matchesAnyGlob(raw, globs)) return true;
+
+  try {
+    const abs = isAbsolute(raw) ? raw : resolve(root, raw);
+    if (matchesAnyGlob(abs, globs)) return true;
+    const rel = relative(root, abs);
+    if (rel && !rel.startsWith('..') && !isAbsolute(rel)) {
+      return matchesAnyGlob(rel, globs);
+    }
+  } catch {
+    /* ignore */
+  }
+  return false;
+}
+
+export function filterDetectionFindings(findings, config) {
+  if (!Array.isArray(findings) || findings.length === 0) return [];
+  const ignoreRules = new Set((config?.ignoreRules || []).map((rule) => normalizeIgnoreRule(rule)));
+  const ignoreValues = normalizeIgnoreValueEntries(config?.ignoreValues || []);
+  return findings.filter((finding) => {
+    if (!finding || typeof finding !== 'object') return false;
+    if (ignoreRules.has(normalizeIgnoreRule(finding.antipattern))) return false;
+    if (isIgnoredFindingValue(finding, ignoreValues)) return false;
+    return true;
+  });
+}
+
+function isIgnoredFindingValue(finding, ignoreValues) {
+  if (!Array.isArray(ignoreValues) || ignoreValues.length === 0) return false;
+  const rule = normalizeIgnoreRule(finding.antipattern);
+  const value = extractFindingIgnoreValue(finding);
+  if (!rule || !value) return false;
+  return ignoreValues.some((entry) => {
+    const wildcardValue = entry.value === '*';
+    if (entry.rule !== rule || (!wildcardValue && !ignoreValueMatches(rule, entry.value, value))) return false;
+    if (!Array.isArray(entry.files) || entry.files.length === 0) return !wildcardValue;
+    return findingMatchesScopedIgnoreFile(finding, entry.files);
+  });
+}
+
+function findingMatchesScopedIgnoreFile(finding, globs) {
+  const filePath = String(finding?.file || '').trim();
+  if (!filePath) return false;
+  if (matchesAnyGlob(filePath, globs)) return true;
+
+  const normalized = filePath.split(sep).join('/');
+  const parts = normalized.split('/').filter(Boolean);
+  for (let i = 0; i < parts.length; i++) {
+    const suffix = parts.slice(i).join('/');
+    if (matchesAnyGlob(suffix, globs)) return true;
+  }
+  return false;
+}
+
+export function extractFindingIgnoreValue(finding) {
+  if (!finding || typeof finding !== 'object') return '';
+  const rule = normalizeIgnoreRule(finding.antipattern);
+  const directValueRules = new Set([
+    'overused-font',
+    'bounce-easing',
+    'design-system-font',
+    'design-system-color',
+    'design-system-radius',
+  ]);
+  if (!directValueRules.has(rule)) return '';
+  return normalizeIgnoreValue(extractFindingIgnoreValueRaw(finding, rule));
+}
+
+function extractFindingIgnoreValueRaw(finding, rule = normalizeIgnoreRule(finding?.antipattern)) {
+  const direct = cleanIgnoreValueDisplay(finding.ignoreValue || finding.value || '');
+  if (direct) return direct;
+
+  const candidates = [finding.detail, finding.snippet].filter((v) => typeof v === 'string' && v);
+  for (const text of candidates) {
+    if (rule === 'bounce-easing') {
+      const motion = extractMotionIgnoreValue(text);
+      if (motion) return motion;
+      continue;
+    }
+
+    const primary = text.match(/Primary font:\s*([^()\n;]+)/i);
+    if (primary) return cleanIgnoreValueDisplay(primary[1]);
+
+    const family = text.match(/font-family\s*:\s*["']?([^'",;\n]+)/i);
+    if (family) return cleanIgnoreValueDisplay(family[1]);
+
+    const google = text.match(/[?&]family=([^&:;\n]+)/i);
+    if (google) {
+      try {
+        return cleanIgnoreValueDisplay(decodeURIComponent(google[1]));
+      } catch {
+        return cleanIgnoreValueDisplay(google[1]);
+      }
+    }
+  }
+
+  return '';
+}
+
+function extractMotionIgnoreValue(text) {
+  const tailwind = text.match(/\banimate-bounce\b/i);
+  if (tailwind) return cleanIgnoreValueDisplay(tailwind[0]);
+
+  const bezier = text.match(/cubic-bezier\([^)]+\)/i);
+  if (bezier) return cleanIgnoreValueDisplay(bezier[0]);
+
+  const animation = text.match(/animation(?:-name)?\s*:\s*([^;\n]+)/i);
+  if (animation) {
+    const token = animation[1]
+      .split(/[,\s]+/)
+      .find((part) => /bounce|elastic|wobble|jiggle|spring/i.test(part));
+    if (token) return cleanIgnoreValueDisplay(token);
+  }
+
+  return '';
+}
+
+function cleanIgnoreValueDisplay(value) {
+  return String(value || '')
+    .trim()
+    .replace(/^["']|["']$/g, '')
+    .replace(/\+/g, ' ')
+    .replace(/\s+/g, ' ');
+}
+
+/**
+ * The recorded design-hook decision: 'accepted' | 'declined' | undefined.
+ * config.local.json (per-developer) overrides config.json.
+ */
+export function getHookConsent(root) {
+  let consent;
+  for (const filePath of [getConfigPath(root), getLocalConfigPath(root)]) {
+    const hook = hookSection(safeReadJson(filePath));
+    if (hook && (hook.consent === 'accepted' || hook.consent === 'declined')) consent = hook.consent;
+  }
+  return consent;
+}
+
+/**
+ * Persist the per-developer decision to config.local.json, preserving any
+ * sibling keys, and ensure the file is gitignored.
+ */
+export function setHookConsent(root, value) {
+  const filePath = getLocalConfigPath(root);
+  const existing = safeReadJson(filePath) || {};
+  const hook = hookSection(existing) || {};
+  const next = { ...existing, hook: { ...hook, consent: value } };
+  mkdirSync(dirname(filePath), { recursive: true });
+  writeFileSync(filePath, `${JSON.stringify(next, null, 2)}\n`);
+  ensureConfigGitExclude(root);
+  return filePath;
+}
+
+const EXCLUDE_OPEN = '# impeccable-config-ignore-start';
+const EXCLUDE_CLOSE = '# impeccable-config-ignore-end';
+const EXCLUDE_PATTERNS = ['.impeccable/config.local.json'];
+
+/**
+ * Add config.local.json to `.git/info/exclude` so a developer's decision is
+ * never committed. Idempotent via marker comments. Best-effort; returns false
+ * when there is no resolvable git dir.
+ */
+export function ensureConfigGitExclude(root) {
+  try {
+    const gitDir = resolveGitDir(root);
+    if (!gitDir) return false;
+    const target = join(gitDir, 'info', 'exclude');
+    const existing = existsSync(target) ? readFileSync(target, 'utf-8') : '';
+    const block = [EXCLUDE_OPEN, ...EXCLUDE_PATTERNS, EXCLUDE_CLOSE].join('\n');
+    const markerRe = new RegExp(`${escapeRegExp(EXCLUDE_OPEN)}[\\s\\S]*?${escapeRegExp(EXCLUDE_CLOSE)}`);
+    let updated;
+    if (markerRe.test(existing)) {
+      updated = existing.replace(markerRe, block);
+    } else {
+      const prefix = existing.length === 0 ? '' : existing.endsWith('\n') ? existing : `${existing}\n`;
+      updated = `${prefix}${block}\n`;
+    }
+    if (updated !== existing) {
+      mkdirSync(dirname(target), { recursive: true });
+      writeFileSync(target, updated);
+    }
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+function resolveGitDir(root) {
+  const dotGit = join(root, '.git');
+  if (!existsSync(dotGit)) return null;
+  try {
+    if (statSync(dotGit).isDirectory()) return dotGit;
+    // A `.git` file (worktree/submodule) points elsewhere: "gitdir: <path>".
+    const match = readFileSync(dotGit, 'utf-8').match(/gitdir:\s*(.+)/);
+    if (match) {
+      const resolved = match[1].trim();
+      return isAbsolute(resolved) ? resolved : join(root, resolved);
+    }
+  } catch {
+    /* fall through */
+  }
+  return null;
+}
+
+function escapeRegExp(value) {
+  return value.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
diff --git a/tools/design-detector/lib/impeccable-paths.mjs b/tools/design-detector/lib/impeccable-paths.mjs
new file mode 100644
index 0000000..91121dd
--- /dev/null
+++ b/tools/design-detector/lib/impeccable-paths.mjs
@@ -0,0 +1,128 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { resolveProjectRoot } from '../context.mjs';
+
+export const IMPECCABLE_DIR = '.impeccable';
+export const LIVE_DIR = 'live';
+export const CRITIQUE_DIR = 'critique';
+
+export function getImpeccableDir(cwd = process.cwd(), options = {}) {
+  return path.join(resolveProjectRoot(cwd, options), IMPECCABLE_DIR);
+}
+
+export function getDesignSidecarPath(cwd = process.cwd(), options = {}) {
+  return path.join(getImpeccableDir(cwd, options), 'design.json');
+}
+
+export function getDesignSidecarCandidates(cwd = process.cwd(), contextDir = cwd, options = {}) {
+  const projectRoot = resolveProjectRoot(cwd, options);
+  const candidates = [
+    getDesignSidecarPath(cwd, options),
+    path.join(projectRoot, 'DESIGN.json'),
+  ];
+  const contextLegacy = path.join(contextDir, 'DESIGN.json');
+  if (!candidates.includes(contextLegacy)) candidates.push(contextLegacy);
+  return candidates;
+}
+
+export function resolveDesignSidecarPath(cwd = process.cwd(), contextDir = cwd, options = {}) {
+  return firstExisting(getDesignSidecarCandidates(cwd, contextDir, options));
+}
+
+export function getLiveDir(cwd = process.cwd(), options = {}) {
+  return path.join(getImpeccableDir(cwd, options), LIVE_DIR);
+}
+
+export function getLiveConfigPath(cwd = process.cwd(), options = {}) {
+  return path.join(getLiveDir(cwd, options), 'config.json');
+}
+
+export function getLegacyLiveConfigPath(scriptsDir) {
+  return path.join(scriptsDir, 'config.json');
+}
+
+export function resolveLiveConfigPath({ cwd = process.cwd(), scriptsDir, env = process.env, targetPath } = {}) {
+  if (env.IMPECCABLE_LIVE_CONFIG && env.IMPECCABLE_LIVE_CONFIG.trim()) {
+    const configured = env.IMPECCABLE_LIVE_CONFIG.trim();
+    return path.isAbsolute(configured) ? configured : path.resolve(cwd, configured);
+  }
+  const primary = getLiveConfigPath(cwd, { targetPath });
+  if (fs.existsSync(primary)) return primary;
+  if (scriptsDir) {
+    const legacy = getLegacyLiveConfigPath(scriptsDir);
+    if (fs.existsSync(legacy)) return legacy;
+  }
+  return primary;
+}
+
+export function getLiveServerPath(cwd = process.cwd(), options = {}) {
+  return path.join(getLiveDir(cwd, options), 'server.json');
+}
+
+export function getLegacyLiveServerPath(cwd = process.cwd(), options = {}) {
+  return path.join(resolveProjectRoot(cwd, options), '.impeccable-live.json');
+}
+
+export function readLiveServerInfo(cwd = process.cwd(), options = {}) {
+  for (const filePath of [getLiveServerPath(cwd, options), getLegacyLiveServerPath(cwd, options)]) {
+    try {
+      const info = JSON.parse(fs.readFileSync(filePath, 'utf-8'));
+      if (info && typeof info.pid === 'number' && !isLiveServerPidReachable(info.pid)) {
+        try { fs.unlinkSync(filePath); } catch {}
+        continue;
+      }
+      return { info, path: filePath };
+    } catch {
+      /* try next */
+    }
+  }
+  return null;
+}
+
+export function isLiveServerPidReachable(pid) {
+  try {
+    process.kill(pid, 0);
+    return true;
+  } catch (err) {
+    // ESRCH means "no such process". EPERM means the process exists but this
+    // user cannot signal it, so the live server info is still valid.
+    return err?.code !== 'ESRCH';
+  }
+}
+
+export function writeLiveServerInfo(cwd = process.cwd(), info, options = {}) {
+  const filePath = getLiveServerPath(cwd, options);
+  fs.mkdirSync(path.dirname(filePath), { recursive: true });
+  fs.writeFileSync(filePath, JSON.stringify(info));
+  return filePath;
+}
+
+export function removeLiveServerInfo(cwd = process.cwd(), options = {}) {
+  for (const filePath of [getLiveServerPath(cwd, options), getLegacyLiveServerPath(cwd, options)]) {
+    try { fs.unlinkSync(filePath); } catch {}
+  }
+}
+
+export function getLiveSessionsDir(cwd = process.cwd(), options = {}) {
+  return path.join(getLiveDir(cwd, options), 'sessions');
+}
+
+export function getLegacyLiveSessionsDir(cwd = process.cwd(), options = {}) {
+  return path.join(resolveProjectRoot(cwd, options), '.impeccable-live', 'sessions');
+}
+
+export function getLiveAnnotationsDir(cwd = process.cwd(), options = {}) {
+  return path.join(getLiveDir(cwd, options), 'annotations');
+}
+
+export function getCritiqueDir(cwd = process.cwd(), options = {}) {
+  return path.join(getImpeccableDir(cwd, options), CRITIQUE_DIR);
+}
+
+export function getLegacyLiveAnnotationsDir(cwd = process.cwd(), options = {}) {
+  return path.join(resolveProjectRoot(cwd, options), '.impeccable-live', 'annotations');
+}
+
+function firstExisting(paths) {
+  return paths.find((filePath) => fs.existsSync(filePath)) || null;
+}
diff --git a/tools/design-detector/lib/is-generated.mjs b/tools/design-detector/lib/is-generated.mjs
new file mode 100644
index 0000000..165e1ca
--- /dev/null
+++ b/tools/design-detector/lib/is-generated.mjs
@@ -0,0 +1,69 @@
+/**
+ * Decide whether a given file is "generated" (regenerated by a build step,
+ * unsafe to write variants into) or "source" (safe to edit, changes persist).
+ *
+ * Why this matters: when the user picks an element on a page whose underlying
+ * file is regenerated by a build step (e.g. `scripts/build-sub-pages.js`
+ * rewriting `public/docs/*.html`), writing variants or accepted changes into
+ * that file is silent data loss — the next build wipes them.
+ *
+ * Signals, in order of reliability:
+ *   1. Git check-ignore: gitignored files are assumed generated.
+ *   2. File-header markers ("GENERATED", "DO NOT EDIT", "AUTO-GENERATED")
+ *      within the first ~300 characters — catches non-git projects.
+ */
+
+import { execSync } from 'node:child_process';
+import fs from 'node:fs';
+import path from 'node:path';
+
+const HEADER_SCAN_BYTES = 300;
+const HEADER_MARKERS = [
+  /@generated\b/i,
+  /\bGENERATED\s+FILE\b/,
+  /\bAUTO-?GENERATED\b/i,
+  /\bDO\s+NOT\s+EDIT\b/i,
+];
+
+/**
+ * @param {string} filePath - absolute or cwd-relative path
+ * @param {object} [options]
+ * @param {string} [options.cwd] - project root (defaults to process.cwd())
+ */
+export function isGeneratedFile(filePath, options = {}) {
+  const cwd = options.cwd || process.cwd();
+  const absPath = path.isAbsolute(filePath) ? filePath : path.resolve(cwd, filePath);
+
+  if (isGitIgnored(absPath, cwd)) return true;
+  if (hasGeneratedHeader(absPath)) return true;
+  return false;
+}
+
+function isGitIgnored(absPath, cwd) {
+  try {
+    execSync(`git check-ignore --quiet ${JSON.stringify(absPath)}`, {
+      cwd,
+      stdio: 'ignore',
+    });
+    return true; // exit 0 = ignored
+  } catch (err) {
+    // Exit code 1 = not ignored. Exit code 128 = not a git repo or other error.
+    // In both cases, treat as "not known to be ignored."
+    return false;
+  }
+}
+
+function hasGeneratedHeader(absPath) {
+  let fd;
+  try {
+    fd = fs.openSync(absPath, 'r');
+    const buf = Buffer.alloc(HEADER_SCAN_BYTES);
+    const bytesRead = fs.readSync(fd, buf, 0, HEADER_SCAN_BYTES, 0);
+    const head = buf.slice(0, bytesRead).toString('utf-8');
+    return HEADER_MARKERS.some((re) => re.test(head));
+  } catch {
+    return false;
+  } finally {
+    if (fd !== undefined) { try { fs.closeSync(fd); } catch {} }
+  }
+}
diff --git a/tools/design-detector/lib/target-args.mjs b/tools/design-detector/lib/target-args.mjs
new file mode 100644
index 0000000..967925a
--- /dev/null
+++ b/tools/design-detector/lib/target-args.mjs
@@ -0,0 +1,42 @@
+class TargetArgError extends Error {
+  constructor(message, code) {
+    super(message);
+    this.name = 'TargetArgError';
+    this.code = code;
+  }
+}
+
+export function parseTargetPath(args = [], { strict = false } = {}) {
+  let targetPath = null;
+  for (let i = 0; i < args.length; i++) {
+    const arg = String(args[i]);
+    if (arg === '--target' || arg === '-t') {
+      const next = args[i + 1];
+      if (next && !String(next).startsWith('-')) {
+        targetPath = String(next);
+        i++;
+        continue;
+      }
+      if (strict) {
+        throw new TargetArgError('--target requires a path value.', 'TARGET_VALUE_MISSING');
+      }
+      continue;
+    }
+    if (arg.startsWith('--target=')) {
+      const value = arg.slice('--target='.length);
+      if (value) {
+        targetPath = value;
+        continue;
+      }
+      if (strict) {
+        throw new TargetArgError('--target requires a path value.', 'TARGET_VALUE_MISSING');
+      }
+    }
+  }
+  return targetPath;
+}
+
+export function parseTargetOptions(args = [], options = {}) {
+  const targetPath = parseTargetPath(args, options);
+  return targetPath ? { targetPath } : {};
+}