:root {
  --bg: #111216; --panel: #1b1d23; --line: #2c2f38; --text: #eceef2; --muted: #9aa0ad; --accent: #ffc440; --danger: #ff7a7a;
  color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; }
header { display: flex; align-items: center; gap: 12px; padding: 10px 18px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
header strong { font-size: 16px; }
.spacer { flex: 1; }
select, .button { font: inherit; color: var(--text); background: var(--panel); border: 1px solid var(--line); border-radius: 7px; }
select { padding: 6px 8px; min-width: 0; flex: 0 1 42ch; }
.button { padding: 6px 12px; text-decoration: none; }
.button:hover { border-color: var(--muted); }
.muted { color: var(--muted); }
.error, .bad { color: var(--danger); }
main { padding: 14px 18px 30px; max-width: 1400px; margin: 0 auto; }
#signed-out { display: grid; place-items: center; min-height: 60vh; }
.player { position: relative; }
.loading { position: absolute; inset: 0; display: grid; place-items: center; pointer-events: none; }
.spinner { width: 46px; height: 46px; border-radius: 50%; border: 4px solid rgba(255, 255, 255, .25);
  border-top-color: var(--accent); animation: spin .9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
video { display: block; width: 100%; max-height: 74vh; aspect-ratio: 16 / 9; background: #000; border-radius: 10px; }
.chapters { list-style: none; margin: 10px 0 0; padding: 0; display: flex; gap: 3px; }
.chapters li { min-width: 0; padding: 5px 8px; border-radius: 5px; background: var(--panel); border: 1px solid var(--line);
  color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; cursor: pointer; }
.chapters li b { color: var(--accent); margin-right: 6px; }
.chapters li.on { border-color: var(--accent); color: var(--text); }
.bar { display: flex; align-items: center; gap: 12px; margin-top: 10px; }
#length { font-variant-numeric: tabular-nums; }
@media (max-width: 700px) {
  main { padding: 10px; }
  .chapters { flex-direction: column; }
  .chapters li { flex: none !important; }
}
.transcript { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 8px; max-width: 80ch; }
.transcript li { display: flex; gap: 12px; color: var(--muted); line-height: 1.5; }
.transcript li.on { color: var(--text); }
.transcript button { font: inherit; font-variant-numeric: tabular-nums; color: var(--accent); background: none; border: none;
  padding: 0; cursor: pointer; flex: none; }