:root {
  --bg: #0f172a;      /* slate-900 */
  --panel: #111827;   /* gray-900 */
  --card: #111827;
  --text: #e5e7eb;    /* gray-200 */
  --muted: #94a3b8;   /* slate-400 */
  --accent: #22c55e;  /* green-500 */
  --accent-2: #3b82f6;/* blue-500 */
  --border: #1f2937;  /* gray-800 */
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Noto Sans, "Apple Color Emoji", "Segoe UI Emoji";
  background: linear-gradient(135deg, #0b1022, #121a33 60%, #0b1022);
  color: var(--text);
}
.app-header {
  padding: 24px 20px 8px;
  text-align: center;
}
.app-header h1 { margin: 0 0 4px; font-size: 28px; }
.subtitle { margin: 0; color: var(--muted); }

.tabs {
  display: flex; justify-content: center; gap: 10px;
  position: sticky; top: 0; background: rgba(15, 23, 42, 0.8); backdrop-filter: blur(8px);
  padding: 10px; border-bottom: 1px solid var(--border);
  z-index: 10;
}
.tab {
  border: 1px solid var(--border);
  background: #0b1225; color: var(--text); padding: 8px 14px; border-radius: 8px; cursor: pointer;
}
.tab.active, .tab:hover { border-color: var(--accent-2); color: #fff; }

main { max-width: 1100px; margin: 20px auto; padding: 0 16px; }
.panel { display: none; }
.panel.active { display: block; }
.panel-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));
  border: 1px solid var(--border);
  border-radius: 12px; padding: 16px; margin-top: 12px;
}

/* Quiz */
.quiz-controls { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.answers { display: grid; gap: 8px; margin-top: 10px; }
.answers button { text-align: left; white-space: normal; }
.feedback { margin-top: 10px; color: var(--muted); }
.quiz-nav { display: flex; gap: 8px; margin-top: 10px; }
.hidden { display: none !important; }

/* Music */
.music-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 12px; }
@media (max-width: 900px) { .music-grid { grid-template-columns: 1fr; } }
.playlist .list { list-style: none; padding: 0; margin: 0; max-height: 420px; overflow: auto; }
.playlist .list li { padding: 8px; border-bottom: 1px solid var(--border); cursor: pointer; }
.playlist .list li.active { background: rgba(59, 130, 246, 0.15); }

.player .now-playing { display: flex; gap: 12px; align-items: center; }
.player #cover { width: 96px; height: 96px; border-radius: 8px; object-fit: cover; border: 1px solid var(--border); }
.controls { display: flex; gap: 10px; align-items: center; margin-top: 12px; }
.controls button { font-size: 18px; }
.progress, .volume { display: flex; gap: 10px; align-items: center; margin-top: 8px; }
input[type=\"range\"] { width: 100%; }

/* Buttons, inputs */
button { border: 1px solid var(--border); background: #0b1225; color: var(--text); padding: 8px 12px; border-radius: 8px; cursor: pointer; }
button.primary { background: var(--accent-2); border-color: var(--accent-2); color: #fff; }
button.secondary { background: #0b1225; color: var(--text); }
button:disabled { opacity: 0.6; cursor: not-allowed; }
label.inline { display: inline-flex; align-items: center; gap: 6px; }

.plex-config { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; margin-top: 8px; }
.plex-actions { display: flex; gap: 10px; margin-top: 12px; }

.hint { color: var(--muted); margin-top: 8px; }

.app-footer { text-align: center; padding: 24px; color: var(--muted); }