:root {
  --bg: #0f172a;
  --card: #1e293b;
  --card-2: #273449;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #f97316;
  --ok: #22c55e;
  --radius: 14px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
h1, h2, h3 { margin: 0; }
a { color: var(--accent); }
button { font: inherit; cursor: pointer; }
.muted { color: var(--muted); }
.center { text-align: center; }
.error { color: #fca5a5; }

/* Header */
.top {
  position: sticky; top: 0; z-index: 2;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(8px);
  padding: 14px 16px 12px;
  border-bottom: 1px solid #1e293b;
}
.top-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.top h1 { font-size: 1.4rem; }
.top p { margin: 0; font-size: 0.9rem; }
.ghost { background: none; border: 1px solid #334155; color: var(--muted); border-radius: 999px; padding: 6px 12px; font-size: 0.85rem; }
.progress { display: flex; align-items: center; gap: 10px; margin-top: 10px; font-size: 0.85rem; color: var(--muted); }
.progress-bar { flex: 1; height: 8px; background: #1e293b; border-radius: 999px; overflow: hidden; }
.progress-bar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--accent), #fb923c); transition: width 0.3s; }

main { max-width: 720px; margin: 0 auto; padding: 12px 12px 48px; }

/* Guide */
.guide { background: var(--card); border-radius: var(--radius); padding: 12px 16px; margin: 4px 0 16px; }
.guide summary { font-weight: 600; cursor: pointer; }
.guide h3 { font-size: 1rem; margin-top: 12px; }
.guide p, .guide li { color: #cbd5e1; font-size: 0.92rem; }
.guide ul { padding-left: 20px; }

/* Weeks */
.week { margin-bottom: 20px; scroll-margin-top: 120px; }
.week h2 { display: flex; align-items: baseline; gap: 8px; font-size: 1.05rem; margin: 8px 4px 10px; }
.week h2 .theme { color: var(--muted); font-weight: 400; font-size: 0.9rem; flex: 1; }
.week h2 .count { color: var(--muted); font-weight: 500; font-size: 0.85rem; }

/* Session cards */
.session { background: var(--card); border-radius: var(--radius); margin-bottom: 8px; overflow: hidden; border: 2px solid transparent; scroll-margin-top: 120px; }
.session.is-next { border-color: var(--accent); }
.session-head { display: flex; align-items: center; gap: 14px; width: 100%; padding: 12px 14px; background: none; border: 0; color: inherit; text-align: left; }
.seq { display: flex; flex-direction: column; align-items: center; min-width: 52px; padding: 6px 4px; border-radius: 10px; background: var(--card-2); }
.is-next .seq { background: var(--accent); color: #111827; }
.kicker { font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 700; }
.num { font-size: 1.25rem; font-weight: 700; line-height: 1.1; }
.info { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.label { font-weight: 600; }
.meta { color: var(--muted); font-size: 0.85rem; }
.badge { width: 28px; height: 28px; border-radius: 50%; border: 2px solid #475569; display: grid; place-items: center; font-weight: 700; flex: none; }
.is-done .badge { background: var(--ok); border-color: var(--ok); color: #052e16; }
.is-done .label { text-decoration: line-through; text-decoration-color: rgba(148, 163, 184, 0.6); }
.session-body { padding: 0 14px 14px; }
.player video { width: 100%; aspect-ratio: 16 / 9; background: #000; border-radius: 10px; display: block; }
.player-off { background: var(--card-2); border-radius: 10px; padding: 16px; color: var(--muted); margin: 0; }
.notes { margin: 12px 0 6px; }
.source { font-size: 0.82rem; margin: 0 0 12px; }
.done-toggle { width: 100%; padding: 12px; border-radius: 10px; border: 0; background: var(--accent); color: #111827; font-weight: 700; }
.is-done .done-toggle { background: var(--card-2); color: var(--ok); }
.done-toggle:disabled { opacity: 0.6; }

/* Login */
body.login { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card { width: 100%; max-width: 360px; background: var(--card); border-radius: 20px; padding: 28px 24px; text-align: center; }
.login-card img { border-radius: 18px; }
.login-card h1 { margin-top: 10px; }
.login-card form { text-align: left; margin-top: 20px; display: grid; gap: 10px; }
.login-card label { font-size: 0.9rem; color: var(--muted); }
.login-card input { font-size: 16px; padding: 12px; border-radius: 10px; border: 1px solid #334155; background: var(--bg); color: var(--text); }
.login-card button { padding: 12px; border-radius: 10px; border: 0; background: var(--accent); color: #111827; font-weight: 700; }
.login-card .error { margin: 0; }