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20px}.video-player{aspect-ratio:16/9;background:#111;border-radius:10px;width:100%;margin-bottom:16px;display:block}.video-unavailable{color:#fff;text-align:center;place-items:center;padding:24px;line-height:1.8;display:grid}.v-tabs{border-bottom:1px solid var(--line);gap:6px;margin-bottom:15px;display:flex}.v-tabs button{color:var(--ink-2);border-bottom:2px solid #0000;margin-bottom:-1px;padding:8px 16px;font-size:13.5px}.v-tabs button:hover{color:var(--green-deep)}.v-tabs button.active{color:var(--green-deep);border-bottom-color:var(--green);font-weight:600}.v-tab-body{color:var(--ink-2);font-size:14px;line-height:2}.v-tab-body p{margin:0}.lesson-panel{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px 22px}.lesson-panel h3{font-size:16px;font-weight:700}.lesson-note{color:var(--ink-3);margin:8px 0 14px;font-size:12.5px;line-height:1.7}.lesson-item{text-align:left;border-top:1px solid var(--line);grid-template-columns:34px 1fr auto;align-items:center;gap:11px;width:100%;padding:13px 0;display:grid}.lesson-item span{color:var(--green-deep);font-size:14px;font-weight:700}.lesson-item strong{font-size:14px;font-weight:600}.lesson-item em{color:var(--ink-3);font-size:12px;font-style:normal}.lesson-item:hover strong{color:var(--green-deep)}.lesson-start{border-top:1px solid var(--line);flex-direction:column;align-items:stretch;gap:11px;margin-top:16px;padding-top:16px;display:flex}.lesson-start small{color:var(--ink-3);text-align:center;font-size:12px}.lesson-start button{width:100%}.empty-state{text-align:center;flex-direction:column;align-items:center;gap:7px;padding:34px 20px;display:flex}.empty-icon{background:var(--green-soft);width:58px;height:58px;color:var(--green-deep);border-radius:50%;place-items:center;margin-bottom:6px;font-size:24px;display:grid}.empty-state b{font-size:15.5px}.empty-state p{color:var(--ink-3);max-width:380px;font-size:13px}.empty-state .btn-green{margin-top:12px}.quick-links{flex-direction:column;gap:9px;display:flex}.quick-links button{border:1px solid var(--line);text-align:left;border-radius:10px;justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.quick-links button:hover{border-color:var(--green-light);background:var(--bg-2)}.quick-links b{font-size:14px}.quick-links small{color:var(--ink-3);font-size:11.5px}.picker-head{justify-content:space-between;align-items:flex-start;margin-bottom:16px;display:flex}.picker-head .rt-kicker{font-size:12px}.picker-head h3{margin-top:6px;font-size:22px;font-weight:700}.record-filters{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:16px;display:flex}.rf-search{border:1px solid var(--line);background:var(--card);border-radius:9px;flex:1;min-width:200px;padding:9px 14px;font-size:13.5px}.rf-search:focus{border-color:var(--green-light);outline:none}.record-filters select{border:1px solid var(--line);background:var(--card);color:var(--ink-2);border-radius:9px;padding:9px 12px;font-size:13px}.seat-grid{grid-template-columns:repeat(auto-fill,minmax(118px,1fr));gap:11px;display:grid}.seat-chip{border:1px solid var(--line);background:var(--card);border-radius:11px;flex-direction:column;align-items:center;gap:3px;padding:14px 8px;display:flex}.seat-chip:hover{border-color:var(--green);box-shadow:var(--shadow);transform:translateY(-1px)}.seat-chip .seat-no{color:var(--green-deep);background:var(--green-soft);border-radius:6px;margin-bottom:5px;padding:1px 9px;font-size:11px}.seat-chip b{font-size:15px;font-weight:600}.seat-chip small{color:var(--ink-3);font-size:10.5px}.record-table{flex-direction:column;display:flex}.record-table-head,.record-row{grid-template-columns:44px 1.3fr 1.3fr 70px 64px 70px;align-items:center;gap:12px;display:grid}.record-table-head{color:var(--ink-3);border-bottom:1px solid var(--line);padding:0 16px 9px;font-size:12px}.record-row{border-bottom:1px solid var(--line);text-align:left;width:100%;padding:12px 16px}.record-row:hover{background:var(--card-2)}.rr-avatar{color:#fff;border-radius:50%;place-items:center;width:36px;height:36px;font-size:14px;display:grid}.rr-who b,.rr-poem b{font-size:13.5px;font-weight:600;display:block}.rr-who small,.rr-poem small{color:var(--ink-3);font-size:11px}.rr-dur{color:var(--ink-2);font-size:13px}.rr-arrow{color:var(--ink-3);text-align:right;font-size:12.5px}.roster-page{flex-direction:column;display:flex}.import-hint{background:var(--card-2)}.import-hint b{margin-bottom:5px;font-size:14px;display:block}.import-hint p{color:var(--ink-2);font-size:12.5px}.import-msg{color:var(--green-deep);margin-top:9px;font-size:13px;display:block}.add-form{flex-wrap:wrap;gap:10px;display:flex}.add-form input{border:1px solid var(--line);border-radius:9px;flex:1;min-width:130px;padding:9px 13px;font-size:13.5px}.add-form input:focus{border-color:var(--green-light);outline:none}.student-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px;display:grid}.student-tile{border:1px solid var(--line);background:var(--card);border-radius:12px;align-items:center;display:flex;overflow:hidden}.st-main{text-align:left;flex:1;align-items:center;gap:12px;min-width:0;padding:13px 15px;display:flex}.st-main:hover{background:var(--card-2)}.st-avatar{color:#fff;border-radius:50%;flex-shrink:0;place-items:center;width:42px;height:42px;font-size:17px;display:grid}.st-info{min-width:0}.st-info b{font-size:14.5px;display:block}.st-info small{color:var(--ink-3);font-size:11.5px;display:block}.st-info .st-stat{color:var(--green-deep);margin-top:2px}.st-del{width:34px;color:var(--ink-3);border-left:1px solid var(--line);flex-shrink:0;align-self:stretch;font-size:18px}.st-del:hover{color:var(--cinnabar-deep);background:var(--cinnabar-soft)}.student-detail-page{flex-direction:column;display:flex}.trend-svg{width:100%;height:auto}.trend-label{fill:var(--ink-2);font-size:12px}.history-list{flex-direction:column;display:flex}.history-row{border-bottom:1px solid var(--line);grid-template-columns:40px 1fr 64px;align-items:center;gap:12px;padding:11px 4px;display:grid}.h-no{background:var(--bg-2);width:28px;height:28px;color:var(--ink-2);border-radius:50%;place-items:center;font-size:12.5px;display:grid}.history-row b{font-size:14px;display:block}.history-row small{color:var(--ink-3);font-size:11.5px}.report-cols{grid-template-columns:1.3fr 1fr;align-items:stretch;gap:14px;display:grid}.qr-card{text-align:center;flex-direction:column;align-items:center;display:flex}.qr-card img{width:190px;height:190px;margin:6px 0}.qr-note{color:var(--ink-3);font-size:11.5px;line-height:1.6}.muted-p{color:var(--ink-3);padding:10px 0;font-size:13px}.playback-card audio{width:100%;margin-top:8px}.mobile-report{background:var(--bg);max-width:480px;min-height:100vh;margin:0 auto;padding:18px 18px 30px}.mr-head{justify-content:space-between;align-items:center;margin-bottom:22px;display:flex}.mr-brand{color:var(--ink);font-size:17px;font-weight:700}.mr-tag{background:var(--green-soft);color:var(--green-deep);border-radius:6px;padding:3px 10px;font-size:11px}.mr-title h2{font-size:24px;font-weight:700}.mr-title p{color:var(--ink-2);margin-top:4px;font-size:14px}.mr-title small{color:var(--ink-3);font-size:11.5px}.mr-score{background:var(--card);border:1px solid var(--line);border-radius:14px;align-items:baseline;gap:10px;margin:22px 0;padding:18px 22px;display:flex}.mr-score strong{color:var(--green-deep);font-size:44px;font-weight:700;line-height:1}.mr-score span{color:var(--ink-3);font-size:13px}.mr-grid{grid-template-columns:repeat(4,1fr);gap:9px;margin-bottom:14px;display:grid}.mr-cell{background:var(--card);border:1px solid var(--line);text-align:center;border-radius:11px;padding:13px 4px}.mr-cell strong{font-size:20px;font-weight:700;display:block}.mr-cell span{color:var(--ink-2);font-size:11.5px}.mr-overview{grid-template-columns:repeat(3,1fr);gap:9px;margin-bottom:14px;display:grid}.mr-overview div{background:var(--card);border:1px solid var(--line);text-align:center;border-radius:11px;padding:12px}.mr-overview small{color:var(--ink-3);font-size:11px;display:block}.mr-overview b{font-size:14px;font-weight:600}.mr-text{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:12px;padding:15px 17px}.mr-text b{margin-bottom:6px;font-size:14px;display:block}.mr-text p{color:var(--ink-2);font-size:13px;line-height:1.7}.mr-foot{color:var(--ink-3);text-align:center;margin-top:18px;font-size:12px}.assign-bar{background:var(--gold-soft);border:1px solid #e8d5ae;border-radius:12px;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:14px;padding:14px 18px;display:flex}.assign-bar b{font-size:14px}.assign-bar select{border:1px solid var(--line);background:#fff;border-radius:9px;padding:8px 12px;font-size:13px}.assign-bar .assign-note{color:var(--ink-3);margin-left:auto;font-size:12px}