:root {
  --ink: #1c2125;
  --muted: #69757d;
  --paper: #f7f6f3;
  --card: #ffffff;
  --accent: #16695c;      /* deck's teal */
  --accent-ink: #0e4a41;
  --rule: #e3e0da;
  --chip: #eaf2f0;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 Georgia, "Times New Roman", serif;
}
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
header {
  background: var(--accent);
  color: #fff;
  padding: 28px 0 22px;
}
header a { color: #d6e8e4; text-decoration: none; }
header a:hover { text-decoration: underline; }
header h1 {
  margin: 4px 0 6px;
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 1.9rem;
  letter-spacing: -0.01em;
}
.course { margin: 0; font-family: "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: .85rem; text-transform: uppercase; letter-spacing: .12em; opacity: .9; }
.meta { margin: 2px 0; color: #d6e8e4; font-family: "Segoe UI", Helvetica, Arial, sans-serif; font-size: .95rem; }
.meta a { text-decoration: underline; }
.lnav { display: flex; justify-content: space-between; gap: 16px; margin-top: 14px;
  font-family: "Segoe UI", Helvetica, Arial, sans-serif; font-size: .95rem; }
footer .lnav a { color: var(--accent-ink); }
.toc { margin: 18px auto 0; font-family: "Segoe UI", Helvetica, Arial, sans-serif; }
.toc summary { cursor: pointer; color: var(--accent-ink); font-weight: 600; }
.toc a { color: var(--accent-ink); text-decoration: none; white-space: nowrap; }
.toc a:hover { text-decoration: underline; }

.chapter {
  display: flex; align-items: baseline; gap: 14px;
  margin: 44px 0 6px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent);
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
}
.chapter span { font-size: 1.25rem; font-weight: 700; color: var(--accent-ink); }

.row {
  display: grid;
  grid-template-columns: minmax(0, 58fr) minmax(0, 42fr);
  gap: 22px;
  padding: 18px 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}
.row figure { margin: 0; position: sticky; top: 12px; }
.row img {
  width: 100%; height: auto;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
figcaption {
  margin-top: 6px;
  color: var(--muted);
  font-family: "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: .85rem;
  display: flex; align-items: center; gap: 10px;
}
.transcript p { margin: 0 0 .9em; }
.tlink {
  font-family: Consolas, "SF Mono", Menlo, monospace;
  font-size: .8rem;
  color: var(--accent-ink);
  background: var(--chip);
  border-radius: 4px;
  padding: 1px 6px;
  text-decoration: none;
  white-space: nowrap;
}
.tlink:hover { background: var(--accent); color: #fff; }
.chip { font-size: .85rem; }
.dim { color: var(--muted); font-style: italic; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 22px;
  padding-top: 26px; padding-bottom: 26px;
}
.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none;
  color: var(--ink);
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
  transition: box-shadow .15s ease, transform .15s ease;
}
.card:hover { box-shadow: 0 4px 14px rgba(0,0,0,.12); transform: translateY(-2px); }
.card img { width: 100%; height: auto; display: block; }
.card-body { padding: 12px 16px 14px; font-family: "Segoe UI", Helvetica, Arial, sans-serif; }
.card-body h2 { margin: 0 0 4px; font-size: 1.05rem; color: var(--accent-ink); }
.card-body p { margin: 0; color: var(--muted); font-size: .9rem; }

footer { padding: 26px 24px 40px; color: var(--muted);
  font-family: "Segoe UI", Helvetica, Arial, sans-serif; font-size: .85rem; }
footer a { color: var(--accent-ink); }

@media (max-width: 860px) {
  .row { grid-template-columns: 1fr; }
  .row figure { position: static; }
}