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var(--transition-fast);-webkit-user-select:none;user-select:none;justify-content:space-between;align-items:center;padding:10px 12px;font-size:.85rem;font-weight:600;display:flex}.chapter-header:hover{background:var(--bg-hover)}.chapter-title-wrap{align-items:center;gap:6px;display:flex}.lecture-list{flex-direction:column;gap:4px;padding:4px;display:flex}.lecture-item{border-radius:var(--radius-sm);cursor:pointer;color:var(--text-secondary);transition:all var(--transition-fast);text-align:left;background:0 0;border:none;justify-content:space-between;align-items:center;gap:8px;width:100%;padding:8px 10px;font-size:.8rem;display:flex}.lecture-item:hover{background:var(--bg-hover);color:var(--text-primary)}.lecture-item.active{color:#818cf8;background:#6366f126;border-left:3px solid #6366f1;font-weight:700}.lecture-item-title{text-overflow:ellipsis;white-space:nowrap;flex:1;overflow:hidden}.lecture-status-tag{white-space:nowrap;border-radius:4px;padding:2px 6px;font-size:.72rem;font-weight:600}.status-completed{color:#34d399;background:#10b98126}.status-in-progress{color:#38bdf8;background:#0ea5e926}.status-not-started{background:var(--bg-hover);color:var(--text-muted)}.lecture-video-panel{flex-direction:column;gap:14px;display:flex}.video-wrapper{border-radius:var(--radius-lg);border:1px solid var(--border-subtle);background:#000;width:100%;padding-bottom:56.25%;position:relative;overflow:hidden;box-shadow:0 8px 24px #0000004d}.video-wrapper iframe,.video-wrapper div#youtube-player{border:none;width:100%;height:100%;position:absolute;top:0;left:0}.video-meta-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);flex-direction:column;gap:12px;padding:16px;display:flex}.meta-top-row{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.meta-title-area{flex-direction:column;flex:1;gap:4px;display:flex}.meta-chapter-tag{color:#818cf8;background:#6366f11f;border-radius:4px;align-self:flex-start;padding:2px 8px;font-size:.75rem;font-weight:600}.meta-lecture-title{color:var(--text-primary);margin:0;font-size:1.05rem;font-weight:700}.meta-actions-area{align-items:center;gap:8px;display:flex}.pdf-download-btn{color:#f472b6;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);background:#ec48991f;border:1px solid #ec489940;align-items:center;gap:6px;padding:6px 12px;font-size:.82rem;font-weight:600;text-decoration:none;display:inline-flex}.pdf-download-btn:hover{background:#ec489933;transform:translateY(-1px)}.next-lecture-btn{background:var(--brand-primary);color:#fff;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);border:none;align-items:center;gap:6px;padding:6px 14px;font-size:.82rem;font-weight:600;display:inline-flex}.next-lecture-btn:hover{opacity:.9;transform:translateY(-1px)}.live-tracker-bar{background:var(--bg-app);border:1px solid var(--border-subtle);border-radius:var(--radius-md);justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;font-size:.82rem;display:flex}.tracker-time-display{color:var(--text-secondary);align-items:center;gap:6px;font-family:monospace;font-size:.88rem;display:flex}.tracker-time-display strong{color:#38bdf8}.tracker-progress-wrap{flex:1;align-items:center;gap:8px;max-width:260px;display:flex}.tracker-badge{border-radius:999px;padding:3px 8px;font-size:.78rem;font-weight:700}.tracker-badge.completed{color:#34d399;background:#10b98133}.tracker-badge.playing{color:#38bdf8;background:#0ea5e933;animation:1.5s infinite pulse}@keyframes pulse{0%{opacity:.7}50%{opacity:1}to{opacity:.7}}