/* Extensible Courses video collections: keep the index light and defer media
   playback until a learner opens a topic page and presses play. */
.teaching-resource-section .section-intro { max-width: 680px; }
.teaching-resource-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 28px;
}
.teaching-resource-card {
  display: grid;
  grid-template-columns: 116px minmax(0, 1fr);
  gap: 20px;
  min-width: 0;
  min-height: 190px;
  padding: 18px 0;
  border-top: 1px solid rgba(255,255,255,.22);
  color: inherit;
  text-decoration: none;
}
.teaching-resource-mark,
.teaching-resource-detail-mark {
  display: grid;
  place-items: center;
  min-height: 154px;
  background: linear-gradient(145deg, #181818, #050505 70%);
  border: 1px solid rgba(255,255,255,.12);
  color: rgba(255,255,255,.78);
  font: 500 44px/1 Roboto, Helvetica, Arial, sans-serif;
  letter-spacing: -.06em;
}
.teaching-resource-card:hover .teaching-resource-mark { border-color: rgba(255,255,255,.38); color: #fff; }
.teaching-resource-copy { display: flex; flex-direction: column; align-items: flex-start; min-width: 0; }
.teaching-resource-kicker,
.teaching-resource-copy > small,
.teaching-resource-link,
.teaching-video-copy > span {
  color: var(--dim);
  font: 700 10px/1.45 Roboto, Helvetica, Arial, "PingFang SC", sans-serif;
  letter-spacing: .025em;
}
.teaching-resource-copy > strong { margin-top: 11px; font-size: 22px; line-height: 1.2; font-weight: 400; overflow-wrap: anywhere; }
.teaching-resource-copy > small { margin-top: 5px; color: var(--muted); font-size: 13px; }
.teaching-resource-summary { margin-top: 12px; color: var(--muted); font-size: 12px; line-height: 1.55; overflow-wrap: anywhere; }
.teaching-resource-link { margin-top: auto; padding-top: 13px; color: var(--ink); }
.teaching-resource-hero { grid-template-columns: minmax(120px, 180px) minmax(0, 1fr) minmax(160px, 220px); }
.teaching-resource-detail-mark { min-height: 180px; font-size: 64px; }
.teaching-resource-hero .detail-meta { grid-template-columns: 1fr; }
.teaching-resource-library { margin-top: 22px; }
.teaching-video-list { display: grid; gap: 26px; }
.teaching-video-card {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(240px, .85fr);
  gap: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.16);
}
.teaching-video-frame { min-width: 0; background: #050505; aspect-ratio: 16 / 9; }
.teaching-video-frame video { display: block; width: 100%; height: 100%; object-fit: contain; background: #050505; }
.teaching-video-copy { min-width: 0; }
.teaching-video-copy h3 { margin: 9px 0 10px; font-size: 20px; line-height: 1.3; font-weight: 400; overflow-wrap: anywhere; }
.teaching-video-copy h3 small { display: block; margin-top: 4px; color: var(--muted); font-size: 13px; }
.teaching-video-copy p { color: var(--muted); font-size: 12px; line-height: 1.65; overflow-wrap: anywhere; }
.teaching-video-presenter { color: var(--dim) !important; }
.teaching-video-links { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 12px; font: 11px/1.5 Roboto, Helvetica, Arial, "PingFang SC", sans-serif; }
.teaching-video-links a { color: var(--ink); text-underline-offset: 3px; }
@media (max-width: 980px) {
  .teaching-resource-grid { grid-template-columns: 1fr; gap: 4px; }
  .teaching-resource-hero { grid-template-columns: minmax(110px, 150px) minmax(0, 1fr); }
  .teaching-resource-hero .detail-meta { grid-column: 1 / -1; grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  .teaching-resource-card { grid-template-columns: 82px minmax(0, 1fr); gap: 14px; min-height: 0; padding: 14px 0 18px; }
  .teaching-resource-mark { min-height: 112px; font-size: 34px; }
  .teaching-resource-copy > strong { margin-top: 7px; font-size: 18px; }
  .teaching-resource-summary { margin-top: 8px; font-size: 11px; }
  .teaching-resource-link { padding-top: 10px; }
  .teaching-resource-hero { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 14px; }
  .teaching-resource-detail-mark { min-height: 92px; font-size: 34px; }
  .teaching-resource-hero .detail-title-block { min-width: 0; margin: 0; }
  .teaching-resource-hero .detail-title-block h1 { font-size: clamp(25px, 7vw, 34px); overflow-wrap: anywhere; }
  .teaching-resource-hero .detail-summary { grid-column: 1 / -1; }
  .teaching-resource-hero .detail-meta { grid-column: 1 / -1; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .teaching-video-card { grid-template-columns: minmax(0, 1fr); gap: 13px; }
  .teaching-video-copy h3 { font-size: 18px; }
}