diff --git a/frontend/src/App.css b/frontend/src/App.css
new file mode 100644
index 0000000..e95632d
--- /dev/null
+++ b/frontend/src/App.css
@@ -0,0 +1,891 @@
+@font-face {
+  font-family: 'DM Sans';
+  font-weight: 400;
+  font-style: normal;
+  font-display: swap;
+  src: url('/fonts/DM-Sans-400.ttf') format('truetype');
+}
+@font-face {
+  font-family: 'DM Sans';
+  font-weight: 500;
+  font-style: normal;
+  font-display: swap;
+  src: url('/fonts/DM-Sans-500.ttf') format('truetype');
+}
+@font-face {
+  font-family: 'DM Sans';
+  font-weight: 700;
+  font-style: normal;
+  font-display: swap;
+  src: url('/fonts/DM-Sans-700.ttf') format('truetype');
+}
+@font-face {
+  font-family: 'JetBrains Mono';
+  font-weight: 400;
+  font-style: normal;
+  font-display: swap;
+  src: url('/fonts/JetBrains-Mono-400.ttf') format('truetype');
+}
+@font-face {
+  font-family: 'JetBrains Mono';
+  font-weight: 700;
+  font-style: normal;
+  font-display: swap;
+  src: url('/fonts/JetBrains-Mono-700.ttf') format('truetype');
+}
+
+:root {
+  --bg: #0c0c0c;
+  --bg-raised: #141412;
+  --bg-input: #1a1a17;
+  --border: #2a2a25;
+  --border-strong: #3a3a33;
+  --text: #e8e4de;
+  --text-dim: #8a867e;
+  --text-faint: #5a5750;
+  --accent: #ff4f6d;
+  --accent-dim: #cc3f57;
+  --accent-bg: #ff4f6d08;
+  --error: #ff5f56;
+  --error-bg: #ff5f5608;
+  --serif: 'Instrument Serif', Georgia, serif;
+  --sans: 'DM Sans', system-ui, sans-serif;
+  --mono: 'JetBrains Mono', 'Courier New', monospace;
+}
+
+* {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}
+
+::selection {
+  background: var(--accent);
+  color: var(--bg);
+}
+
+body {
+  font-family: var(--sans);
+  font-size: 14px;
+  background: var(--bg);
+  color: var(--text);
+  line-height: 1.65;
+  -webkit-font-smoothing: antialiased;
+}
+
+/* ── layout ── */
+
+.container {
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 3rem 2rem;
+}
+
+h1 {
+  font-family: var(--sans);
+  font-size: 3.5rem;
+  font-weight: 400;
+  font-style: normal;
+  color: var(--text);
+  letter-spacing: -0.03em;
+  margin-bottom: 2.5rem;
+  line-height: 1;
+}
+
+h1::after {
+  content: '';
+  display: block;
+  width: 100%;
+  height: 2px;
+  background: var(--accent);
+  margin-top: 1rem;
+}
+
+h2 {
+  font-family: var(--sans);
+  font-size: 1.5rem;
+  font-weight: 400;
+  color: var(--text);
+  letter-spacing: -0.01em;
+  margin-bottom: 1rem;
+  line-height: 1.2;
+}
+
+.intro-block {
+  display: flex;
+  gap: 2rem;
+  margin-bottom: 2rem;
+}
+
+.intro {
+  color: var(--text);
+  font-size: 14px;
+  line-height: 1.7;
+  flex: 1;
+  padding-right: 2rem;
+  border-right: 1px solid var(--border);
+}
+
+.intro-right {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+  padding-left: 2rem;
+}
+
+.instructions {
+  color: var(--text);
+  font-size: 14px;
+  text-align: right;
+  line-height: 1.7;
+}
+
+.instructions p {
+  margin-bottom: 0.25rem;
+}
+
+.notes {
+  color: var(--text-dim);
+  font-size: 12px;
+  text-align: right;
+  line-height: 1.7;
+  border-top: 1px solid var(--border);
+  padding-top: 1rem;
+}
+
+.notes p {
+  margin-bottom: 0.25rem;
+}
+
+a {
+  color: #ef4444;
+  text-decoration: none;
+}
+
+a:hover {
+  text-decoration: underline;
+}
+
+a:visited {
+  color: #b91c1c;
+}
+
+/* ── topbar ── */
+
+.topbar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 1rem;
+  padding: 0.75rem 0;
+  border-bottom: 2px solid var(--border);
+  margin-bottom: 2rem;
+}
+
+.topbar span {
+  font-size: 15px;
+  color: var(--text-dim);
+  letter-spacing: 0.02em;
+  text-transform: uppercase;
+}
+
+.topbar code {
+  font-family: var(--mono);
+  font-size: 15px;
+  color: var(--accent);
+  text-transform: none;
+}
+
+/* ── two-column layout ── */
+
+.layout {
+  display: flex;
+  gap: 2rem;
+  align-items: flex-start;
+}
+
+.sidebar {
+  width: 260px;
+  flex-shrink: 0;
+  border: 1px solid var(--border);
+  border-top: 3px solid var(--accent);
+  padding: 1.25rem;
+  background: var(--bg-raised);
+}
+
+.main-panel {
+  flex: 1;
+  min-width: 0;
+}
+
+/* ── sections ── */
+
+section {
+  margin-bottom: 1.5rem;
+  padding: 1.25rem;
+  border: 1px solid var(--border);
+  border-left: 3px solid var(--border-strong);
+  background: var(--bg-raised);
+  transition: border-left-color 0.2s ease;
+}
+
+section:hover {
+  border-left-color: var(--accent);
+}
+
+section:last-child {
+  margin-bottom: 0;
+}
+
+/* ── text helpers ── */
+
+.muted {
+  color: var(--text-faint);
+  font-size: 12px;
+  letter-spacing: 0.03em;
+  text-transform: uppercase;
+}
+
+/* ── form fields ── */
+
+.field {
+  display: flex;
+  gap: 0;
+}
+
+input[type="text"] {
+  flex: 1;
+  padding: 0.6rem 0.85rem;
+  border: 1px solid var(--border);
+  border-right: none;
+  background: var(--bg-input);
+  color: var(--text);
+  font-family: var(--mono);
+  font-size: 13px;
+  transition: border-color 0.15s ease;
+}
+
+input[type="text"]::placeholder {
+  color: var(--text-dim);
+  font-style: italic;
+  font-family: var(--sans);
+  font-size: 13px;
+}
+
+input[type="text"]:focus {
+  outline: none;
+  border-color: var(--accent);
+  background: var(--bg);
+}
+
+input[type="text"].input-invalid {
+  border-color: var(--error);
+  background: var(--error-bg);
+}
+
+.field-hint {
+  color: var(--error);
+  font-size: 11px;
+  margin-top: 0.35rem;
+  letter-spacing: 0.02em;
+}
+
+button {
+  padding: 0.6rem 1.2rem;
+  border: 1px solid var(--border);
+  background: var(--bg-input);
+  color: var(--text);
+  cursor: pointer;
+  font-family: var(--sans);
+  font-size: 13px;
+  font-weight: 700;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  white-space: nowrap;
+  transition: all 0.15s ease;
+}
+
+button:hover:not(:disabled) {
+  background: var(--accent);
+  color: var(--bg);
+  border-color: var(--accent);
+}
+
+button:disabled {
+  opacity: 0.35;
+  cursor: not-allowed;
+}
+
+/* ── topbar logout button ── */
+
+.topbar button {
+  font-size: 11px;
+  padding: 0.4rem 0.8rem;
+  border-color: var(--border);
+}
+
+/* ── pre / code output ── */
+
+pre {
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-left: 3px solid var(--text-faint);
+  padding: 0.85rem 1rem;
+  overflow-x: auto;
+  font-family: var(--mono);
+  font-size: 12px;
+  margin-top: 0.75rem;
+  white-space: pre-wrap;
+  word-break: break-all;
+  line-height: 1.7;
+  color: var(--text-dim);
+}
+
+/* ── messages ── */
+
+.error {
+  color: var(--error);
+  background: var(--error-bg);
+  border: 1px solid var(--error);
+  border-left: 3px solid var(--error);
+  padding: 0.6rem 0.85rem;
+  margin-top: 0.75rem;
+  font-size: 12px;
+}
+
+.auth-warning {
+  color: #b5a13b;
+  background: #b5a13b18;
+  border: none;
+  border-left: 3px solid #b5a13b;
+  padding: 0.6rem 0.85rem;
+  margin-top: 0.75rem;
+  font-size: 12px;
+  line-height: 1.5;
+}
+
+.auth-warning a {
+  color: #ef4444;
+}
+
+.auth-warning-details {
+  margin-top: 0.5rem;
+  margin-bottom: 0;
+  margin-left: 0;
+  border: 1px solid #b5a13b44;
+  background: #131006;
+  padding: 0.6rem 0.85rem;
+  border-radius: 4px;
+}
+
+.auth-warning code {
+  font-size: 11px;
+  background: #b5a13b15;
+  padding: 0.1rem 0.3rem;
+  border-radius: 2px;
+}
+
+.success {
+  color: #4caf50;
+  border-color: #4caf50;
+  border-left: 3px solid #4caf50;
+  background: #4caf5008;
+}
+
+/* ── login form ── */
+
+form {
+  margin: 0;
+}
+
+/* ── vouch list ── */
+
+.vouch-list {
+  list-style: none;
+  margin-top: 0.75rem;
+  max-height: 60vh;
+  overflow-y: auto;
+}
+
+.vouch-list li {
+  display: flex;
+  justify-content: space-between;
+  align-items: baseline;
+  padding: 0.5rem 0;
+  border-bottom: 1px solid var(--border);
+  gap: 0.75rem;
+}
+
+.vouch-list li:last-child {
+  border-bottom: none;
+}
+
+
+.vouch-handle {
+  font-size: 15px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  flex: 1;
+}
+
+.vouch-date {
+  color: var(--text-dim);
+  font-size: 11px;
+  flex-shrink: 0;
+  font-variant-numeric: tabular-nums;
+}
+
+.vouch-delete {
+  background: none;
+  border: none;
+  cursor: pointer;
+  padding: 0 0.25rem;
+  font-size: 14px;
+  opacity: 0.5;
+  flex-shrink: 0;
+}
+
+.vouch-delete:hover {
+  opacity: 1;
+}
+
+/* ── right sidebar (remote vouches) ── */
+
+.sidebar-right {
+  width: 240px;
+  flex-shrink: 0;
+  border: 1px solid var(--border);
+  border-top: 3px solid var(--text-dim);
+  padding: 1.25rem;
+  background: var(--bg-raised);
+}
+
+.vouch-mutual {
+  color: var(--text-faint);
+  font-size: 10px;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  flex-shrink: 0;
+}
+
+
+/* ── pagination ── */
+
+.vouch-count {
+  font-weight: 400;
+  font-size: 0.85em;
+  color: var(--text-dim);
+}
+
+.load-more {
+  width: 100%;
+  margin-top: 0.5rem;
+  font-size: 11px;
+  padding: 0.4rem 0.8rem;
+}
+
+/* ── footer ── */
+
+.footer {
+  margin-top: 3rem;
+  padding-top: 1rem;
+  border-top: 1px solid var(--border);
+  color: var(--text-dim);
+  font-size: 12px;
+  text-align: center;
+}
+
+.design-link {
+  text-align: center;
+  margin-top: 3rem;
+  font-size: 12px;
+  letter-spacing: 0.03em;
+}
+
+/* ── design decisions ── */
+
+.design-decisions {
+  margin-top: 1rem;
+}
+
+.design-decisions-list {
+  border: 1px solid var(--border);
+  border-top: 3px solid var(--accent);
+  background: var(--bg-raised);
+}
+
+.design-decision-item {
+  padding: 1rem 1.25rem;
+  border-bottom: 1px solid var(--border);
+}
+
+.design-decision-item:last-child {
+  border-bottom: none;
+}
+
+.design-decision-item h3 {
+  font-family: var(--sans);
+  font-size: 14px;
+  font-weight: 700;
+  color: var(--text);
+  margin-bottom: 0.35rem;
+}
+
+.design-decision-item p {
+  font-size: 13px;
+  line-height: 1.7;
+  color: var(--text-dim);
+}
+
+/* ── bot repositories ── */
+
+.bot-repos-section {
+  margin-top: 2rem;
+  border-top: 3px solid var(--accent);
+  border-left: 1px solid var(--border);
+}
+
+.bot-repos-desc {
+  color: var(--text-dim);
+  font-size: 12px;
+  margin-bottom: 0.75rem;
+  line-height: 1.5;
+}
+
+.bot-repos-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+
+.bot-repo-item {
+  padding: 0.6rem 0;
+  border-bottom: 1px solid var(--border);
+}
+
+.bot-repo-item:last-child {
+  border-bottom: none;
+}
+
+.bot-repo-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: flex-start;
+  gap: 0.5rem;
+}
+
+.bot-repo-info {
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+  flex: 1;
+}
+
+.bot-repo-name {
+  font-family: var(--mono);
+  font-size: 13px;
+  font-weight: 700;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.fork-icon {
+  opacity: 0.6;
+  flex-shrink: 0;
+}
+
+.bot-repo-desc {
+  color: var(--text-dim);
+  font-size: 11px;
+  line-height: 1.4;
+  margin-top: 0.15rem;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.bot-repo-btn {
+  font-size: 11px;
+  padding: 0.3rem 0.7rem;
+  flex-shrink: 0;
+}
+
+.bot-repo-btn-add:hover:not(:disabled) {
+  background: #4caf50;
+  border-color: #4caf50;
+  color: var(--bg);
+}
+
+.bot-repo-btn-remove:hover:not(:disabled) {
+  background: var(--error);
+  border-color: var(--error);
+  color: var(--bg);
+}
+
+/* ── maintainers ── */
+
+.maintainers {
+  margin-top: 0.4rem;
+  display: flex;
+  align-items: flex-start;
+  gap: 0.4rem;
+  flex-wrap: wrap;
+}
+
+.maintainers-label {
+  color: var(--text-faint);
+  font-size: 11px;
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+  line-height: 22px;
+  flex-shrink: 0;
+}
+
+.maintainers-list {
+  display: flex;
+  align-items: center;
+  gap: 0.35rem;
+  flex-wrap: wrap;
+}
+
+.maintainer-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  padding: 0.15rem 0.4rem;
+  font-size: 11px;
+  line-height: 1;
+}
+
+.maintainer-chip a {
+  font-size: 11px;
+}
+
+.maintainer-avatar {
+  width: 16px;
+  height: 16px;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.maintainer-remove {
+  background: none;
+  border: none;
+  color: var(--text-faint);
+  font-size: 10px;
+  padding: 0 0.15rem;
+  cursor: pointer;
+  line-height: 1;
+  opacity: 0.5;
+}
+
+.maintainer-remove:hover {
+  opacity: 1;
+  color: var(--error);
+  background: none;
+}
+
+.maintainer-add-btn {
+  background: none;
+  border: 1px solid var(--border);
+  color: var(--text-dim);
+  font-size: 13px;
+  width: 22px;
+  height: 22px;
+  padding: 0;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  line-height: 1;
+}
+
+.maintainer-add-btn:hover:not(:disabled) {
+  background: var(--accent);
+  border-color: var(--accent);
+  color: var(--bg);
+}
+
+.maintainer-input-wrapper {
+  position: relative;
+}
+
+.maintainer-input {
+  width: 140px !important;
+  font-size: 11px !important;
+  padding: 0.2rem 0.4rem !important;
+  border: 1px solid var(--border) !important;
+  border-right: 1px solid var(--border) !important;
+  background: var(--bg-input);
+  color: var(--text);
+  font-family: var(--mono);
+}
+
+.maintainer-input:focus {
+  border-color: var(--accent) !important;
+  outline: none;
+}
+
+.maintainer-dropdown {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+  margin: 0;
+  padding: 0;
+  list-style: none;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-top: none;
+  z-index: 20;
+  max-height: 160px;
+  overflow-y: auto;
+  min-width: 180px;
+}
+
+.maintainer-dropdown li {
+  display: flex;
+  align-items: center;
+  gap: 0.35rem;
+  padding: 0.3rem 0.5rem;
+  cursor: pointer;
+  font-size: 11px;
+}
+
+.maintainer-dropdown li:hover,
+.maintainer-dd-active {
+  background: var(--border);
+}
+
+.maintainer-dd-avatar {
+  width: 16px;
+  height: 16px;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+/* ── responsive ── */
+
+@media (max-width: 980px) {
+  .container {
+    padding: 2rem 1rem;
+  }
+
+  h1 {
+    font-size: 2.5rem;
+  }
+
+  .layout {
+    flex-direction: column;
+  }
+
+  .sidebar {
+    width: 100%;
+  }
+
+  .sidebar-right {
+    width: 100%;
+  }
+
+  .main-panel {
+    width: 100%;
+  }
+
+  .intro-block {
+    flex-direction: column;
+  }
+
+  .intro {
+    border-right: none;
+    border-bottom: 1px solid var(--border);
+    padding-right: 0;
+    padding-bottom: 1rem;
+  }
+
+  .intro-right {
+    padding-left: 0;
+  }
+
+  .instructions {
+    text-align: left;
+  }
+
+  .design-decisions-list {
+    width: 100%;
+  }
+}
+
+/* Typeahead */
+.handle-input-wrapper {
+  position: relative;
+  flex: 1;
+}
+
+.handle-input-wrapper input {
+  width: 100%;
+  box-sizing: border-box;
+}
+
+.typeahead-dropdown {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+  margin: 0;
+  padding: 0;
+  list-style: none;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-top: none;
+  z-index: 10;
+  max-height: 280px;
+  overflow-y: auto;
+}
+
+.typeahead-dropdown li {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  padding: 0.4rem 0.6rem;
+  cursor: pointer;
+}
+
+.typeahead-dropdown li.typeahead-active {
+  background: var(--border);
+}
+
+.typeahead-avatar {
+  width: 24px;
+  height: 24px;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.typeahead-info {
+  display: flex;
+  flex-direction: column;
+  min-width: 0;
+}
+
+.typeahead-name {
+  font-size: 0.85rem;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.typeahead-handle {
+  font-size: 0.75rem;
+  opacity: 0.6;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}