:root {
  --bg: #080a10;
  --ink: #efe8da;
  --muted: #a39b8c;
  --faint: #6f685c;
  --line: rgba(228, 196, 140, 0.22);
  --gold: #e4c48c;
  --gold-2: #f3e2c0;
  --card: rgba(18, 20, 28, 0.78);
  --danger: #e7b4a4;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  color: var(--ink);
  font-family: "Segoe UI", Candara, "Helvetica Neue", sans-serif;
  font-size: 17px;
  line-height: 1.5;
  background:
    radial-gradient(900px 480px at 80% -10%, rgba(228, 196, 140, 0.08), transparent 60%),
    radial-gradient(700px 500px at -10% 110%, rgba(90, 110, 150, 0.12), transparent 55%),
    var(--bg);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1.2px 1.2px at 8% 16%, rgba(255,255,255,.75), transparent),
    radial-gradient(1px 1px at 18% 72%, rgba(255,255,255,.45), transparent),
    radial-gradient(1.4px 1.4px at 27% 28%, rgba(243,226,192,.8), transparent),
    radial-gradient(1px 1px at 41% 12%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 52% 64%, rgba(255,255,255,.35), transparent),
    radial-gradient(1.3px 1.3px at 63% 22%, rgba(255,255,255,.7), transparent),
    radial-gradient(1px 1px at 74% 48%, rgba(243,226,192,.55), transparent),
    radial-gradient(1px 1px at 86% 18%, rgba(255,255,255,.5), transparent),
    radial-gradient(1.2px 1.2px at 92% 70%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 15% 42%, rgba(255,255,255,.28), transparent);
  opacity: 0.7;
}

a { color: inherit; }

.wrap {
  width: min(1040px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.6rem 0 4rem;
  position: relative;
}

.top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2.2rem;
}

.brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  text-decoration: none;
}

.star {
  width: 28px;
  height: 28px;
  flex: none;
  fill: var(--gold);
}

.mark {
  font-family: Palatino, "Palatino Linotype", "Iowan Old Style", Georgia, serif;
  font-style: italic;
  font-size: 1.85rem;
  line-height: 1;
  letter-spacing: 0.01em;
}

.eyebrow {
  margin: 0.28rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.exit {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
}

.exit:hover { color: var(--gold-2); border-bottom-color: var(--line); }

.lede {
  max-width: 38rem;
  margin: 0 0 1.8rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.shelf {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.card {
  display: block;
  text-decoration: none;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.05rem 1.15rem 1rem;
  min-height: 8.2rem;
  backdrop-filter: blur(8px);
}

.card:hover {
  border-color: rgba(228, 196, 140, 0.5);
  background: rgba(24, 26, 36, 0.88);
}

.num {
  color: var(--gold);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
}

.card h2, .lesson-head h1, .gate h1 {
  font-family: Palatino, "Palatino Linotype", "Iowan Old Style", Georgia, serif;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.card h2 {
  margin: 0.35rem 0 0.4rem;
  font-size: 1.55rem;
  line-height: 1.15;
}

.card p, .note { margin: 0; color: var(--muted); }

.count { margin-top: 0.85rem; color: var(--faint); font-size: 0.86rem; }

.section {
  margin-top: 2.4rem;
}

.section h2 {
  font-family: Palatino, "Palatino Linotype", Georgia, serif;
  font-weight: 500;
  font-size: 1.45rem;
  margin: 0 0 0.8rem;
}

.watch {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(16rem, 0.8fr);
  gap: 1.1rem;
  align-items: start;
}

.stage {
  background: #05060a;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}

.stage video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}

.idle {
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  color: var(--faint);
  padding: 1rem;
  text-align: center;
}

.list { display: flex; flex-direction: column; gap: 0.35rem; }

.lesson {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.7rem;
  align-items: baseline;
  text-decoration: none;
  padding: 0.55rem 0.7rem;
  border-radius: 10px;
  border: 1px solid transparent;
}

.lesson:hover, .lesson.is-on {
  background: rgba(228, 196, 140, 0.08);
  border-color: var(--line);
}

.lesson .ix {
  color: var(--gold);
  font-variant-numeric: tabular-nums;
  font-size: 0.82rem;
}

.lesson .ttl { line-height: 1.35; }

.lesson .sz { color: var(--faint); font-size: 0.8rem; white-space: nowrap; }

.back {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
}

.back:hover { color: var(--gold-2); }

.lesson-head { margin: 0.7rem 0 1.1rem; }

.lesson-head h1 { margin: 0 0 0.35rem; font-size: 2.3rem; line-height: 1.1; }

.crumbs { margin-bottom: 0.8rem; }

.subdirs { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }

.subdirs a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  color: var(--gold-2);
}

.gate {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
}

.door {
  width: min(26rem, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.6rem 1.5rem 1.4rem;
  position: relative;
}

.door h1 { margin: 0.2rem 0 0.45rem; font-size: 2.2rem; }

.door .quiet { color: var(--muted); margin: 0 0 1.2rem; }

label { display: block; margin: 0 0 0.75rem; color: var(--muted); font-size: 0.92rem; }

input {
  display: block;
  width: 100%;
  margin-top: 0.28rem;
  padding: 0.65rem 0.7rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.35);
  color: var(--ink);
  font: inherit;
}

input:focus { outline: 1px solid var(--gold); border-color: var(--gold); }

button.go {
  margin-top: 0.4rem;
  width: 100%;
  border: 0;
  border-radius: 999px;
  padding: 0.7rem 1rem;
  background: var(--gold);
  color: #1a140c;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

button.go:hover { background: var(--gold-2); }

.err { color: var(--danger); margin: 0 0 0.8rem; }

.foot {
  margin-top: 1rem;
  color: var(--faint);
  font-size: 0.86rem;
}

.warn { color: var(--danger); }

@media (max-width: 800px) {
  .shelf, .watch { grid-template-columns: 1fr; }
  .lesson-head h1 { font-size: 1.8rem; }
  .mark { font-size: 1.5rem; }
}

@media (min-width: 801px) {
  .stage { position: sticky; top: 1rem; }
}