src/ui.css

/**
 * Shared UI tokens, in Claude's palette.
 *
 * Exactly three colours are declared per theme — a warm off-white ground, a
 * near-black ink, and Claude's coral accent. Everything that looks like a
 * fourth colour (borders, muted text, panels) is one of those three at reduced
 * alpha, so the whole surface stays in one family and nothing needs picking a
 * new hue to add a component.
 *
 * Fonts are a system stack. Claude's own Styrene and Tiempos are licensed
 * faces, and this extension does no network requests by design, so there is
 * nothing to load them from — the stack below is the closest available match.
 */
:root {
  --bg: #faf9f5;
  --ink: #141413;
  --accent: #d97757;

  --panel: color-mix(in srgb, var(--ink) 4%, var(--bg));
  --panel-strong: color-mix(in srgb, var(--ink) 7%, var(--bg));
  --line: color-mix(in srgb, var(--ink) 10%, transparent);
  --line-strong: color-mix(in srgb, var(--ink) 18%, transparent);
  --muted: color-mix(in srgb, var(--ink) 52%, transparent);
  --on-accent: #ffffff;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #262624;
    --ink: #f5f4ef;
    --accent: #d97757;

    --panel: color-mix(in srgb, var(--ink) 6%, var(--bg));
    --panel-strong: color-mix(in srgb, var(--ink) 10%, var(--bg));
    --line: color-mix(in srgb, var(--ink) 14%, transparent);
    --line-strong: color-mix(in srgb, var(--ink) 24%, transparent);
    --muted: color-mix(in srgb, var(--ink) 55%, transparent);

    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.6 ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

h1, h2 { margin: 0; font-weight: 500; letter-spacing: -0.01em; }
h1 { font-size: 15px; }
h2 { font-size: 12px; color: var(--muted); font-weight: 500; letter-spacing: .04em; text-transform: uppercase; }

button, select, input, textarea {
  font: inherit;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 7px 12px;
  transition: background .12s ease, border-color .12s ease, opacity .12s ease;
}
select { background: var(--panel); }
button { cursor: pointer; }
button:hover:not(:disabled) { background: var(--panel-strong); }
button:disabled { opacity: .35; cursor: default; }

button.primary {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
  font-weight: 500;
}
button.primary:hover:not(:disabled) { background: color-mix(in srgb, var(--ink) 12%, var(--accent)); }
/* Destructive actions read as plain text until hovered — Claude does not spend
   a colour on them, and there is no fourth colour to spend. */
button.danger { border-color: transparent; color: var(--muted); }
button.danger:hover:not(:disabled) { color: var(--accent); background: var(--panel-strong); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.row { display: flex; gap: 8px; align-items: center; }
.grow { flex: 1; min-width: 0; }
.muted { color: var(--muted); }
.mono { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 12px; }

.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--line-strong); flex: none; }
.dot.ready { background: var(--accent); }
.dot.loading { background: var(--accent); animation: pulse 1.4s ease-in-out infinite; }
.dot.error { background: var(--ink); }
@keyframes pulse { 50% { opacity: .3; } }

.hint { font-size: 12px; line-height: 1.45; margin-top: 3px; }
.bar { height: 2px; background: var(--line); border-radius: 2px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); width: 0; transition: width .2s; }

.banner {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background: var(--panel);
}
.banner.error { border-color: var(--accent); }