html.unit-topics-frame { height: 100%; overflow: hidden; }
body.study-page.unit-topics-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  min-height: 0;
  overflow: hidden;
}
.study-page.unit-topics-page .app-shell {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding: 8px 0 0;
}
.study-page.unit-topics-page .resource-topbar { flex: 0 0 auto; margin-bottom: 8px; }
.study-page.unit-topics-page #resultPanel {
  display: flex;
  flex: 1;
  min-height: 0;
}
.study-page.unit-topics-page .resource-page {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}
.study-page.unit-topics-page .resource-page-header {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.study-page.unit-topics-page .resource-page-header > div:first-child { min-width: 0; }
.unit-header-actions { display: flex; align-items: center; gap: 20px; flex: 0 0 auto; }
.unit-header-resources { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 16px; }
.unit-header-resources[hidden] { display: none; }
.unit-header-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  color: var(--cyan, #73e4ff);
  font-size: .875rem;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.unit-header-link:hover { color: var(--ink); }
.unit-header-link:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }
.study-page.unit-topics-page .resource-page-header .secondary-link {
  min-height: 36px;
  padding: 6px 12px;
  width: auto;
  font-size: .875rem;
}
.study-page.unit-topics-page .resource-page-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior-y: contain;
}
.study-page.unit-topics-page > .legal-footer {
  flex: 0 0 auto;
  margin: 0;
  padding: 6px 12px;
  gap: 3px 10px;
  font-size: .7rem;
  line-height: 1.3;
}
/* Use the same two-column lesson layout for standalone topics and lesson groups. */
.study-page.unit-topics-page .unit-page-body {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.study-page.unit-topics-page .unit-page-body > * {
  grid-column: 1 / -1;
  min-width: 0;
}
.study-page.unit-topics-page .unit-page-body > .unit-topic-section:has(> .topic-row-with-video) {
  grid-column: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--glass-button);
  padding: 14px;
}
.study-page.unit-topics-page .unit-topic-section > .topic-row-with-video {
  flex-direction: column;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 12px;
}
.study-page.unit-topics-page .topic-row-with-video h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.5;
}
.study-page.unit-topics-page .topic-row-with-video h3::before { flex-shrink: 0; }
.study-page.unit-topics-page .topic-row-with-video .topic-resource-actions {
  flex-basis: auto;
  flex-wrap: wrap;
}
.study-page.unit-topics-page .topic-row-with-video .topic-resource-actions > a {
  min-height: 36px;
  padding: 5px 10px;
  font-size: .825rem;
  white-space: nowrap;
}
@media (max-width: 820px) {
  .study-page.unit-topics-page .unit-page-body,
  .study-page.unit-topics-page .unit-class-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 480px) {
  .study-page.unit-topics-page .topic-resource-actions:has(> .topic-slides-link) {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: stretch;
    width: 100%;
    gap: 5px;
  }
  .study-page.unit-topics-page .topic-resource-actions:has(> .topic-slides-link) > a {
    min-width: 0;
    min-height: 44px;
    padding: 5px 4px;
    white-space: normal;
    text-align: center;
    line-height: 1.25;
  }
}
@media (max-width: 760px) {
  .study-page.unit-topics-page .resource-page-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 6px 12px;
  }
  .unit-header-actions { display: contents; }
  .unit-header-resources { grid-row: 2; grid-column: 1 / -1; }
  .unit-header-actions > .secondary-link { grid-row: 1; grid-column: 2; }
  .study-page.unit-topics-page .resource-page-header h2 {
    font-size: 1.2rem;
    margin-bottom: 0;
  }
  .study-page.unit-topics-page .resource-page-header .unit-breadcrumb { margin-bottom: 6px; font-size: .7rem; }
  .study-page.unit-topics-page .bilingual-course-label-english { margin-top: 4px; font-size: .8em; }
}
@media print {
  html.unit-topics-frame, body.study-page.unit-topics-page { height: auto; overflow: visible; }
  .study-page.unit-topics-page .resource-page,
  .study-page.unit-topics-page .resource-page-body { overflow: visible; }
}

/* Keep a directory deep link identifiable inside the scrolling topic panel. */
.unit-topic-target{outline:2px solid var(--cyan,#73e4ff);outline-offset:-2px;scroll-margin:12px;border-radius:8px}