/* Student lessons share Laowai's paper, forest and native-size controls. */
.student-room { min-height:100dvh; background:var(--laowai-paper); color:var(--laowai-ink); }
.student-live-header { display:flex; align-items:center; gap:16px; min-height:76px; padding:12px max(20px,calc((100vw - 1120px)/2)); border-bottom:1px solid var(--laowai-line); background:var(--laowai-surface); }
.student-live-header .student-back { width:44px; padding:0; flex:none; }
.student-live-header svg { width:20px; height:20px; }
.student-live-context { display:grid; gap:3px; min-width:0; flex:1; }
.student-live-context>span { color:var(--laowai-muted); font-size:12px; }
.student-live-context>strong { font-size:15px; font-weight:600; overflow-wrap:anywhere; }
.student-live-menu { position:relative; flex:none; }
.student-live-menu>summary { display:grid; place-items:center; min-width:44px; min-height:44px; cursor:pointer; border:1px solid var(--laowai-line); border-radius:var(--laowai-control-radius); list-style:none; }
.student-live-menu>summary::-webkit-details-marker { display:none; }
.student-live-menu>nav { position:absolute; top:52px; right:0; z-index:5; width:220px; padding:6px; display:grid; border:1px solid var(--laowai-line); border-radius:var(--laowai-control-radius); background:var(--laowai-surface); box-shadow:0 12px 30px #193d3614; }
.student-live-menu a { display:flex; align-items:center; min-height:44px; padding:10px 12px; color:inherit; border-radius:8px; text-decoration:none; font-size:14px; }
.student-live-menu a:hover { background:var(--laowai-paper); }
.student-live-main { max-width:1120px; margin:0 auto; padding:28px 20px max(32px,env(safe-area-inset-bottom)); }
.student-live-status { display:flex; align-items:baseline; justify-content:space-between; gap:16px; margin-bottom:12px; color:var(--laowai-forest); font-size:14px; font-weight:600; }
.student-live-status #live-position { white-space:nowrap; font-variant-numeric:tabular-nums; color:var(--laowai-muted); font-weight:400; }
#live-slide-progress { display:block; width:100%; height:4px; border:0; border-radius:4px; background:var(--laowai-line); color:var(--laowai-forest); accent-color:var(--laowai-forest); }
#live-slide-progress::-webkit-progress-bar { background:var(--laowai-line); border-radius:4px; }
#live-slide-progress::-webkit-progress-value { background:var(--laowai-forest); border-radius:4px; }
#live-slide-progress::-moz-progress-bar { background:var(--laowai-forest); border-radius:4px; }
.student-live-lesson { display:flex; align-items:flex-start; justify-content:space-between; gap:18px; margin:28px 0 24px; scroll-margin-top:20px; }
.student-live-lesson h1 { margin:0; font:400 clamp(28px,4vw,40px)/1.2 var(--serif); letter-spacing:-.035em; overflow-wrap:anywhere; }
.student-live-lesson p { margin:10px 0 0; color:var(--laowai-muted); font-size:14px; }
.student-live-lesson .live-timer { font-size:19px; line-height:1.4; padding-top:4px; font-variant-numeric:tabular-nums; white-space:nowrap; }
.student-room .live-stage { padding:28px; min-height:0; border-radius:var(--laowai-card-radius); background:var(--laowai-surface); }
.student-room .live-stage .stage-meta { padding-bottom:20px; font-size:12px; letter-spacing:0; text-transform:none; }
.student-room .stage-meta>span:last-child { display:none; }
.student-room .live-stage .stage-content { max-height:none; overflow:visible; padding:0; }
.student-room .exercise-question,.student-room .exercise-response { min-width:0; }
.student-room .exercise-prompt { margin:0 0 24px; font-size:26px; line-height:1.5; overflow-wrap:anywhere; }
.student-room .choice-preview { display:grid; grid-template-columns:1fr; gap:12px; }
.student-room .live-stage .choice-option { display:flex; align-items:center; min-height:64px; padding:16px; gap:14px; font-size:18px; text-align:left; line-height:1.45; overflow-wrap:anywhere; }
.student-room .choice-option .option-key { flex:none; width:28px; height:28px; display:grid; place-items:center; font:600 13px/1 var(--sans); }
.student-room .choice-option.selected { border-color:var(--laowai-forest); }
.student-room .check-answer { display:flex; align-items:center; justify-content:center; width:100%; margin-top:24px; min-height:50px; font-size:16px; }
.student-room :is(input,select,textarea) { font-size:18px; }
.student-room .matching-fields,.student-room .cloze-fields { display:grid; gap:16px; grid-template-columns:1fr; }
.student-room .match-field { grid-template-columns:minmax(80px,.8fr) minmax(0,1.2fr); gap:14px; }
.student-room .match-field>span { font-size:20px; }
.student-room .match-field>select { font-size:16px; }
.student-room .live-reading .reading-chinese { font-size:28px; }
.student-room .live-reading .reading-translation { color:var(--laowai-muted); font-size:18px; }
.student-room .answer-receipt { margin-top:22px; gap:12px; font-size:16px; }
.student-room .answer-receipt small { display:block; margin-top:6px; font-size:14px; color:var(--laowai-muted); }
.student-room .live-student-note { display:flex; flex-wrap:wrap; gap:12px; margin-top:22px; }

@media(min-width:900px) {
  .student-room .live-stage { padding:36px; }
  .student-room .exercise { display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1fr); gap:36px; align-items:start; }
  .student-room .exercise-prompt { font-size:30px; }
}
@media(max-width:500px) {
  .student-live-header { gap:10px; padding:10px 16px; }
  .student-live-header .connection-status { font-size:0; width:10px; min-width:10px; padding:0; }
  .student-live-header .connection-status:before { flex:none; width:7px; height:7px; margin:0; }
  .student-live-main { padding:22px 16px max(28px,env(safe-area-inset-bottom)); }
  .student-live-lesson { margin:24px 0 20px; }
  .student-live-lesson h1 { font-size:30px; }
  .student-room .live-stage { padding:20px; }
  .student-room .exercise-prompt { font-size:23px; }
  .student-room .live-stage .choice-option { min-height:62px; font-size:18px; }
  .student-room .live-reading .reading-chinese { font-size:25px; }
}