@import "@fontsource/space-grotesk/500.css";
@import "@fontsource/space-grotesk/600.css";
@import "@fontsource/ibm-plex-sans/400.css";
@import "@fontsource/ibm-plex-sans/500.css";
@import "@fontsource/ibm-plex-mono/400.css";
@import "@fontsource/ibm-plex-mono/500.css";

:root {
  --bg-deep: #0b0e14;
  --bg-panel: #131822;
  --bg-panel-border: #232b38;

  --torus-glaze: #c97b56;
  --sun-gold: #ffb454;
  --orbit-trace: #6fd3c7;
  --bg-track: #1a2130;

  --text-primary: #e9e6df;
  --text-secondary: #8d94a3;
  --text-tertiary: #545e70;

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --radius-md: 10px;
  --radius-sm: 6px;

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  overflow: hidden;
}

#app {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100dvh;
  width: 100vw;
}

/* -- top bar -------------------------------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.85rem 1.5rem;
  border-bottom: 1px solid var(--bg-panel-border);
  background: var(--bg-panel);
}

.topbar__title {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  min-width: 0;
}

.topbar__eyebrow {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--torus-glaze);
  white-space: nowrap;
}

.topbar__title h1 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  margin: 0;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* -- viewport: the 3D panel --------------------------------------------- */

.viewport {
  display: grid;
  min-height: 0;
}

.panel {
  position: relative;
  background: var(--bg-deep);
  min-width: 0;
  min-height: 0;
}

.panel__canvas-host {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* Two symmetric overlay affordances bookend the viewport: Physics
   (left) controls the world's parameters, Cutaway (right) controls how
   you see it. Same pill treatment, different accent color on press. */
.overlay-pill {
  position: absolute;
  top: 0.9rem;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.75rem 0.4rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--bg-panel-border);
  background: rgba(19, 24, 34, 0.75);
  backdrop-filter: blur(6px);
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.overlay-pill--left {
  left: 1rem;
}

.overlay-pill--right {
  right: 1rem;
}

.overlay-pill:hover {
  border-color: #364155;
  color: var(--text-primary);
}

.overlay-pill:focus-visible {
  outline: 2px solid var(--sun-gold);
  outline-offset: 2px;
}

.overlay-pill svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.overlay-pill[aria-pressed="true"] {
  border-color: var(--orbit-trace);
  color: var(--orbit-trace);
  background: rgba(111, 211, 199, 0.1);
}

.overlay-pill--physics[aria-pressed="true"] {
  border-color: var(--sun-gold);
  color: var(--sun-gold);
  background: rgba(255, 180, 84, 0.1);
}

/* -- physics drawer ------------------------------------------------------ */

.physics-drawer {
  overflow: hidden;
  max-height: 0;
  transition: max-height 260ms cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--bg-panel);
  border-top: 1px solid var(--bg-panel-border);
}

.physics-drawer.open {
  max-height: 10.5rem;
}

.physics-drawer__inner {
  padding: 1.1rem 1.5rem 1.3rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.6rem;
}

.slider-field {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.slider-field__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}

.slider-field__label {
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.slider-field__label .swatch {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.swatch--season {
  background: var(--torus-glaze);
}

.swatch--orbit {
  background: var(--orbit-trace);
}

.slider-field__value {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* The orbit-size slider shows a live preview of the actual current orbit
   behind the track, and the season slider a schematic of the world's
   rotation against the sun's fixed plane -- both previews double as
   the control's own feedback rather than a separate readout. */
.slider-track {
  position: relative;
  height: 2.4rem;
}

.slider-track__preview {
  position: absolute;
  inset: 0;
  border-radius: 6px;
  background: var(--bg-track);
  overflow: hidden;
  border: 1px solid var(--bg-panel-border);
}

.slider-track__preview svg {
  width: 100%;
  height: 100%;
  display: block;
}

.slider-track input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: transparent;
  margin: 0;
  cursor: pointer;
}

.slider-track input[type="range"]::-webkit-slider-runnable-track {
  height: 100%;
  background: transparent;
}

.slider-track input[type="range"]::-moz-range-track {
  height: 100%;
  background: transparent;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 0 0 3px var(--bg-deep), 0 0 10px 1px currentColor;
  border: none;
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 0 0 3px var(--bg-deep), 0 0 10px 1px currentColor;
  border: none;
}

.thumb-season::-webkit-slider-thumb,
.thumb-season::-moz-range-thumb {
  background: var(--torus-glaze);
  color: var(--torus-glaze);
}

.thumb-orbit::-webkit-slider-thumb,
.thumb-orbit::-moz-range-thumb {
  background: var(--orbit-trace);
  color: var(--orbit-trace);
}

.slider-field__caption {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--text-tertiary);
  line-height: 1.4;
}

@media (max-width: 560px) {
  .physics-drawer__inner {
    grid-template-columns: 1fr;
  }
}

/* -- transport strip --------------------------------------------------- */

.transport {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem 1.5rem;
  border-top: 1px solid var(--bg-panel-border);
  background: var(--bg-panel);
}

.transport-btn {
  display: grid;
  place-items: center;
  width: 2.4rem;
  height: 2.4rem;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1px solid var(--bg-panel-border);
  background: #1a2130;
  color: var(--text-primary);
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease;
}

.transport-btn:hover {
  background: #212a3c;
  border-color: #364155;
}

.transport-btn:focus-visible {
  outline: 2px solid var(--sun-gold);
  outline-offset: 2px;
}

.transport-btn .icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.scrubber {
  position: relative;
  flex: 1 1 auto;
  height: 2.4rem;
  display: flex;
  align-items: center;
  cursor: pointer;
  touch-action: none;
}

.scrubber__track {
  position: absolute;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: 2px;
  background: var(--bg-panel-border);
}

.scrubber__fill {
  position: absolute;
  left: 0;
  height: 3px;
  border-radius: 2px;
  background: var(--orbit-trace);
  width: 0%;
  pointer-events: none;
}

.scrubber__ticks {
  position: absolute;
  inset: 0;
}

/* 12 of these now (one every 4 hours of this world's 48-hour day), so
   each is smaller and plainer than the old 8 labeled critical-point
   ticks -- a quiet dotted ring, not individually called out. */
.scrubber__tick {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-tertiary);
  pointer-events: none;
}

.scrubber__playhead {
  position: absolute;
  top: 50%;
  left: 0%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
  background: var(--sun-gold);
  box-shadow: 0 0 10px 1px rgba(255, 180, 84, 0.65);
  pointer-events: none;
  transition: background-color 120ms ease;
}

.readout {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  width: 3rem;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.speed-select {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.speed-select__label {
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
}

.speed-select select {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  background: #1a2130;
  border: 1px solid var(--bg-panel-border);
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.5rem;
  cursor: pointer;
}

.speed-select select:focus-visible {
  outline: 2px solid var(--sun-gold);
  outline-offset: 1px;
}

/* -- 3D panel fallback (e.g. WebGL unavailable) ------------------------ */

.panel-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 2rem;
  text-align: center;
  font-family: var(--font-body);
  color: var(--text-secondary);
}

.panel-fallback p {
  margin: 0;
}

.panel-fallback__detail {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  max-width: 32ch;
}

/* -- status / loading / error overlay --------------------------------- */

.status {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--bg-deep);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
  padding: 2rem;
  z-index: 10;
}

.status.status--visible {
  display: flex;
}

.status.status--error {
  color: #e08a7a;
}

/* -- responsive: stack panels on narrow viewports ----------------------- */

@media (max-width: 860px) {
  .transport {
    flex-wrap: wrap;
    row-gap: 0.6rem;
  }

  .readout {
    order: 4;
  }

  .speed-select {
    order: 5;
  }
}

/* -- reduced motion ----------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .transport-btn,
  .scrubber__playhead {
    transition: none;
  }
}