.video-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}.video-card{overflow:hidden;transition:transform .2s,background-color .2s,box-shadow .2s;height:100%;display:flex;flex-direction:column}.video-card-link{text-decoration:none;color:inherit;display:flex;flex-direction:column;height:100%}.video-card-link:focus-visible{outline:4px solid var(--focus-color);outline-offset:4px;border-radius:2px}.video-thumbnail-wrapper{position:relative;width:100%;padding-top:56.25%;background-color:#000;overflow:hidden}.video-thumbnail-wrapper img{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;transition:transform .3s ease}.video-card-link:hover img{transform:scale(1.05)}.play-icon-overlay{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;background:var(--primary-fill);color:var(--on-primary);border-radius:50%;display:flex;align-items:center;justify-content:center;border:2px solid rgba(255,255,255,.5);transition:background-color .2s,border-color .2s}.video-card-link:hover .play-icon-overlay{background:var(--primary-strong);border-color:var(--primary-strong)}.lesson-number-badge{position:absolute;top:10px;left:10px;background:#000000b8;color:#fff;font-size:.72rem;font-weight:700;padding:3px 8px;border-radius:var(--radius-sm);z-index:1}.video-info{padding:20px;flex:1;display:flex;flex-direction:column}.video-info h3{font-size:1.1rem;font-weight:600;margin-bottom:10px;color:var(--text-main);line-height:1.4}.video-info p{font-size:.9rem;color:var(--text-muted);margin:0 0 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.lesson-sidebar-number{background:var(--primary-fill);color:var(--on-primary)}.lesson-sidebar-label{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;line-height:1.4}.lesson-sidebar-playing{display:flex;align-items:flex-end;gap:2px;height:14px;flex-shrink:0}.lesson-sidebar-playing span{display:block;width:3px;background:var(--accent-color);border-radius:2px;animation:playing-bar .8s ease-in-out infinite alternate}.lesson-sidebar-playing span:nth-child(1){height:6px;animation-delay:0s}.lesson-sidebar-playing span:nth-child(2){height:10px;animation-delay:.2s}.lesson-sidebar-playing span:nth-child(3){height:4px;animation-delay:.4s}@keyframes playing-bar{0%{height:4px}to{height:14px}}@media(max-width:575.98px){.video-list{grid-template-columns:1fr;gap:16px}.lesson-info-top{flex-direction:column;gap:6px}.lesson-primary{gap:20px}.lesson-nav{flex-wrap:wrap}}@media(prefers-reduced-motion:reduce){.video-card,.video-card-link:hover .video-card,.video-card-link:hover 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