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.video-container.video-main{border-radius:0}.video-grid.call-active .video-container.video-main video,.video-grid.call-active .video-container.video-main div[id^=video-] video{object-fit:cover;width:100%;height:100%}.video-grid.call-active .video-container.video-pip{position:absolute;z-index:8;width:180px;height:135px;bottom:12px;right:12px;border-radius:var(--radius-sm);border:2px solid rgba(255,255,255,.2);box-shadow:0 4px 16px #00000080;aspect-ratio:auto;cursor:grab;transition:border-color .2s}.video-grid.call-active .video-container.video-pip:hover{border-color:var(--accent)}.video-grid.call-active .video-container.video-pip .video-watermark{display:none}.video-grid.call-active .video-container.video-pip .video-label{font-size:10px;padding:2px 6px;bottom:4px;left:4px}@media(max-width:640px){.video-grid.call-active .video-container.video-pip{width:120px;height:90px;bottom:8px;right:8px}}[data-theme=dark]{--bg: #0f0f0f;--surface: #1a1a1a;--surface-2: #242424;--border: #2a2a2a;--text: 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var(--accent-glow)}.login-error{color:var(--danger);font-size:13px;min-height:20px;margin-bottom:8px}.list-box{width:100%;max-width:420px;max-height:90dvh;display:flex;flex-direction:column}#lessonList{overflow-y:auto;flex:1;padding-right:4px}.list-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.admin-tab{cursor:pointer;font-size:14px;font-weight:600;color:var(--text-dim);padding:4px 0;margin-right:16px;border-bottom:2px solid transparent;transition:all .15s}.admin-tab.active{color:var(--accent);border-bottom-color:var(--accent)}.lesson-time{font-size:11px;color:var(--text-sub);margin-left:6px;font-weight:400}.lesson-now{border-color:var(--success)!important;background:#22c55e0f!important}.lesson-soon{border-color:var(--warning)!important;background:#f59e0b0f!important}.lesson-now-badge{font-size:10px;background:var(--success);color:#fff;border-radius:4px;padding:1px 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