:root {
  --yellow: #FBBF24;
  --bg: #000;
  --card: #111;
  --text: #e0e0e0;
  --bright: #f5f5f5;
  --dim: #999;
  --border: #222;
  --max: 960px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}
a { color: var(--yellow); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(0,0,0,0.9);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { color: var(--bright); font-weight: 700; font-size: 18px; text-decoration: none; }
.nav-links { display: flex; gap: 16px; }
.nav-links a { color: var(--dim); font-size: 14px; }
.nav-links a:hover { color: var(--bright); text-decoration: none; }
main { padding: 48px 0 80px; }
.eyebrow { color: var(--yellow); font-size: 13px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 8px; }
h1 { color: var(--bright); font-size: clamp(28px, 4vw, 40px); line-height: 1.15; margin-bottom: 12px; }
.lede { color: var(--dim); max-width: 42rem; margin-bottom: 12px; }
.meta { color: var(--dim); font-size: 13px; margin-bottom: 28px; }
.module-grid { display: grid; gap: 12px; }
@media (min-width: 720px) {
  .module-grid { grid-template-columns: 1fr 1fr; }
}
.module-card {
  display: grid;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  color: inherit;
  text-decoration: none;
}
.module-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0a0a0a;
}
.section-still {
  margin: 0 0 14px;
}
.section-still img {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.module-card:hover { border-color: #444; text-decoration: none; }
.module-card h2 { color: var(--bright); font-size: 17px; margin-bottom: 6px; }
.module-card .row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.pill {
  font-size: 11px; font-weight: 600; padding: 3px 8px; border-radius: 999px;
  background: #1a1a1a; color: var(--dim); border: 1px solid var(--border);
}
.pill.ok { color: #10B981; border-color: #064e3b; }
.pill.miss { color: var(--dim); }
.footer { padding: 24px 0 48px; display: flex; gap: 20px; border-top: 1px solid var(--border); }
.back { display: inline-block; margin-bottom: 16px; font-size: 14px; }
.media-row { display: grid; gap: 20px; margin-bottom: 32px; }
@media (min-width: 800px) {
  .media-row { grid-template-columns: 1.2fr 1fr; align-items: start; }
}
figure img, video {
  width: 100%; border-radius: 12px; border: 1px solid var(--border); background: #0a0a0a;
}
.hint { font-size: 12px; color: var(--dim); margin-top: 8px; }
.media-fallback {
  grid-column: 1 / -1;
  padding: 16px;
  border: 1px dashed var(--border);
  border-radius: 12px;
  color: var(--dim);
}
.section {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; margin-bottom: 12px;
}
.section h3 { color: var(--yellow); font-size: 14px; margin-bottom: 8px; }
.section h4 { color: var(--bright); font-size: 14px; margin: 14px 0 6px; }
.section p, .section ul, .section ol, .section blockquote { margin-bottom: 10px; }
.section ul, .section ol { padding-left: 24px; }
.section li { margin-bottom: 5px; }
.section blockquote {
  border-left: 3px solid var(--yellow);
  padding: 8px 12px;
  background: #0a0a0a;
}
.section .citation { color: var(--dim); font-size: 12px; }
.activity {
  margin-top: 18px; padding: 16px; border: 1px solid #4a3b11; border-radius: 12px;
  background: #0a0a0a;
}
.activity-eyebrow {
  color: var(--yellow); font-size: 11px; font-weight: 700; letter-spacing: 0.05em;
  text-transform: uppercase;
}
.activity h4 { font-size: 18px; margin: 4px 0 8px; }
.activity-prompt { color: var(--bright); font-weight: 600; }
.activity-visual {
  width: 100%; max-height: 280px; object-fit: cover; border-radius: 10px;
  border: 1px solid var(--border); margin: 8px 0;
}
.activity-choices { display: grid; gap: 8px; }
.activity-choice {
  width: 100%; margin: 0; background: #171717; color: var(--bright);
  border: 1px solid #333; text-align: left;
}
.activity-choice.selected { border-color: var(--yellow); background: #29210d; }
.activity-matches { display: grid; gap: 8px; }
.activity-matches label { color: var(--bright); margin: 0; }
.activity-matches select { margin-top: 4px; }
.activity-order { padding-left: 24px; }
.activity-order li {
  display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: center;
  border-bottom: 1px solid var(--border); padding: 8px 0;
}
.order-controls { display: flex; gap: 6px; }
.order-controls button {
  margin: 0; padding: 5px 10px; background: #222; color: var(--bright);
  border: 1px solid #444;
}
.activity-check { margin-top: 12px; }
.activity-result {
  margin-top: 12px; padding: 12px; border-radius: 10px;
  border: 1px solid var(--border); background: #111;
}
.activity-result.correct { border-color: #065f46; color: #6ee7b7; }
.activity-result.incorrect { border-color: #7f1d1d; color: #fca5a5; }
.form-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 20px; margin-top: 20px;
}
label { display: block; font-size: 13px; color: var(--dim); margin: 12px 0 6px; }
input, select, textarea {
  width: 100%; background: #0a0a0a; border: 1px solid var(--border); border-radius: 10px;
  color: var(--bright); padding: 10px 12px; font: inherit;
}
textarea { min-height: 120px; resize: vertical; }
button, .btn {
  display: inline-block; margin-top: 16px; background: var(--yellow); color: #000;
  font-weight: 600; border: 0; border-radius: 10px; padding: 12px 18px; cursor: pointer; font: inherit;
}
button:disabled { opacity: 0.5; cursor: not-allowed; }
.status { margin-top: 12px; font-size: 14px; }
.status.ok { color: #10B981; }
.status.err { color: #f87171; }
#auth-nav { display: flex; align-items: center; gap: 10px; }
.auth-name { color: var(--dim); font-size: 13px; }
.auth-out {
  margin: 0; padding: 6px 10px; background: #222; color: var(--bright);
  border: 1px solid var(--border); border-radius: 8px; font: inherit; cursor: pointer;
}
.feedback-box {
  margin-top: 12px; padding: 12px; border: 1px solid var(--border);
  border-radius: 10px; background: #0a0a0a;
}
.feedback-title { color: var(--bright); font-weight: 600; margin-bottom: 6px; }
.thread-list { display: grid; gap: 8px; margin-top: 12px; }
.thread-card {
  padding: 10px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px;
}