.liaoe-course .slide.cover.active { grid-template-columns: minmax(0, .82fr) minmax(0, 1.4fr); gap: 36px; }
.liaoe-course .cover-question { background: var(--paper); border: 0; padding: 0; }
.cover-evidence { display: block; width: 100%; height: auto; margin-bottom: 32px; }
.liaoe-course .cover-question p { font-size: clamp(26px, 2.2vw, 36px); line-height: 1.7; }
.liaoe-course .cover h1 { font-size: clamp(52px, 5.8vw, 94px); }
.teaching-slide .heading-row { margin-bottom: 22px; }
.action-lab { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr); gap: 42px; flex: 1 0 auto; }
.action-visual { display: flex; flex-direction: column; justify-content: center; min-width: 0; }
.scene-viewport { aspect-ratio: 1; width: min(100%, 580px); overflow: hidden; align-self: center; background: var(--paper); }
.action-strip { width: 300%; max-width: none; height: 100%; display: block; transition: transform 650ms cubic-bezier(.22,.68,0,1); }
.scene-caption { color: var(--muted); text-align: center; margin: 10px 0; font-size: 14px; }
.action-work { display: flex; flex-direction: column; justify-content: center; min-width: 0; padding: 10px 0; }
.scene-tabs, .compare-mode { display: flex; flex-wrap: wrap; gap: 12px; }
.scene-tabs button, .compare-mode button, .compare-controls button, .word-choices button {
  min-height: 44px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); padding: 10px 20px;
  border-radius: 4px; font-size: 18px; cursor: pointer;
}
.scene-tabs button[aria-pressed="true"], .compare-mode button[aria-pressed="true"], .compare-controls button[aria-pressed="true"] { color: var(--accent); border-color: var(--accent); background: var(--soft); }
.scene-question { font-size: clamp(28px, 2.25vw, 37px); line-height: 1.65; font-weight: 600; margin: 28px 0 22px; }
.word-notes { color: var(--muted); font-size: 17px; line-height: 1.75; margin: 18px 0 0; }
.word-choices { display: flex; flex-wrap: wrap; gap: 14px; }
.word-choices button { font-size: 27px; padding: 12px 25px; }
.word-choices button.matched { color: var(--green); border-color: var(--green); background: var(--green-soft); }
.word-choices button.retry { color: var(--accent); background: var(--red-soft); border-color: var(--accent); }
.action-feedback { min-height: 90px; margin: 20px 0; font-size: 21px; line-height: 1.8; color: var(--muted); }
.action-evidence { padding: 20px 0; border-top: 1px solid var(--line); }
.action-evidence > span { color: var(--accent); font-size: 14px; }
.action-evidence p { font-size: clamp(24px, 2vw, 32px); line-height: 1.9; margin: 14px 0 0; }
.action-evidence mark, .poem-pair mark { background: transparent; color: inherit; border-radius: 3px; transition: background-color .5s, color .5s; }
.action-evidence mark.lit { background: var(--green-soft); color: var(--green); box-shadow: 0 2px var(--green); }
.lesson-demo-controls { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 18px; }
.compare-lab { display: flex; flex-direction: column; flex: 1 0 auto; gap: 24px; }
.poem-pair { display: grid; grid-template-columns: 1fr 1fr; flex: 1 0 auto; gap: 44px; }
.poem-pair article { display: flex; flex-direction: column; justify-content: center; padding: 24px 28px; background: var(--wash); min-width: 0; }
.poem-pair h2 { color: var(--accent); font-size: 20px; margin: 0 0 26px; font-weight: 500; }
.poem-pair p { font-size: clamp(25px, 2.25vw, 38px); line-height: 1.85; margin: 8px 0; padding-right: .5em; }
.same-part { transition: color .5s, box-shadow .5s; }
[data-phase="0"] .same-part { color: var(--green); box-shadow: 0 1px var(--green); }
[data-phase="1"] .poem-pair mark, [data-phase="2"] .poem-pair mark { color: var(--accent); background: var(--soft); box-shadow: 0 2px var(--accent); }
.comparison-insight { display: grid; grid-template-columns: 160px 1fr; align-items: start; gap: 24px; padding-top: 20px; border-top: 1px solid var(--line); }
.compare-step-label { color: var(--accent); font-size: 17px; line-height: 1.8; }
.compare-explanation { font-size: 23px; line-height: 1.8; margin: 0; min-height: 84px; }
.compare-controls { display: flex; flex-wrap: wrap; gap: 12px; }
@media (max-height: 800px) and (min-width: 981px) {
  .scene-viewport { max-width: 460px; }
  .action-work { padding: 0; }
  .scene-question { margin: 14px 0; font-size: 27px; }
  .word-notes { font-size: 15px; margin-top: 12px; }
  .action-feedback { font-size: 19px; min-height: 70px; margin: 14px 0; }
  .action-evidence { padding: 14px 0; }
  .action-evidence p { font-size: 25px; margin-top: 8px; }
  .lesson-demo-controls { margin-top: 10px; }
  .compare-lab { gap: 18px; }
  .poem-pair p { font-size: 28px; }
  .poem-pair h2 { margin-bottom: 20px; }
  .compare-explanation { font-size: 21px; min-height: 75px; }
}
@media (max-width: 980px) {
  .liaoe-course .slide.cover.active, .action-lab { grid-template-columns: minmax(0, 1fr); }
  .liaoe-course .cover h1 { font-size: 54px; }
  .liaoe-course .cover-question { padding: 0; }
  .action-lab, .compare-lab { flex: 0 0 auto; }
  .scene-viewport { max-width: 460px; }
  .poem-pair { grid-template-columns: 1fr; gap: 20px; }
  .poem-pair article { padding: 24px; }
  .comparison-insight { grid-template-columns: 1fr; gap: 10px; }
}
@media (max-width: 650px) {
  .liaoe-course .cover h1 { font-size: 42px; }
  .cover-evidence { margin-bottom: 20px; }
  .liaoe-course .cover-question p { font-size: 25px; }
  .action-lab { gap: 18px; }
  .scene-tabs { gap: 8px; }
  .scene-tabs button, .compare-mode button, .compare-controls button { font-size: 16px; padding: 10px 12px; }
  .scene-question { font-size: 26px; margin: 22px 0; }
  .word-choices { gap: 10px; }
  .word-choices button { font-size: 22px; padding: 10px 15px; }
  .action-feedback { font-size: 19px; min-height: 0; }
  .action-evidence p { font-size: 24px; }
  .scene-caption { font-size: 12px; }
  .poem-pair p { font-size: 24px; }
  .compare-explanation { font-size: 19px; }
}
@media (prefers-reduced-motion: reduce) {
  .action-strip, .action-evidence mark, .poem-pair mark, .same-part { transition: none; }
}