:root{--bg: #0f0f0f;--bg-soft: #161616;--text: #ffffff;--muted: #aaaaaa;--accent: #f00;--card: #121212;--shadow: 0 10px 30px rgba(0,0,0,.4);--border: #272727;--category-selected: #404040;--category-unselected: #272727;--hover-bg: rgba(255,255,255,.1);--active-bg: rgba(255,255,255,.1);--search-bg: #121212;--search-border: #303030;--button-bg: #222222}html,body,#root{height:100%}body.light{--bg: #ffffff;--bg-soft: #f6f7f9;--text: #111111;--muted: #5a5a5a;--card: #ffffff;--border: #e0e0e0;--category-selected: #e0e0e0;--category-unselected: #f0f0f0;--hover-bg: rgba(0,0,0,.05);--active-bg: rgba(0,0,0,.1);--search-bg: #f8f9fa;--search-border: #dee2e6;--button-bg: #e9ecef}body{background:var(--bg);color:var(--text);font-family:Roboto,Arial,sans-serif;margin:0;padding:0}.app-shell{min-height:100vh;background:var(--bg)}.app-content{display:flex;min-height:calc(100vh - 56px)}.sidebar{background:transparent!important;border-right:1px solid var(--border);position:sticky;top:56px;height:40px;padding-top:10px;width:240px;flex-shrink:0;transition:width .3s ease,transform .3s ease,background-color .3s ease;overflow:hidden}.sidebar:hover{background:var(--bg)!important}.sidebar-collapsed{width:70px!important;transform:none}.sidebar-open{width:240px!important;transform:none}.sidebar-collapsed[style*="width: 0px"]{width:0px!important;border-right:none;padding:0}.sidebar .nav-link{display:flex;align-items:center;border-radius:12px;background:var(--card);margin:6px 8px;padding:12px 16px;color:var(--text);font-size:14px;font-weight:500;min-height:48px;transition:background .2s ease}.sidebar .nav-link:hover{background:var(--hover-bg)}.sidebar .nav-link.active{background:var(--active-bg)}.sidebar-collapsed .nav-link{padding:12px 8px;margin:0 4px;justify-content:center}.sidebar-collapsed .nav-link 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var(--border);color:var(--text);line-height:1.6}.comments-section{margin-top:24px}.comments-header{border-bottom:1px solid var(--border);padding-bottom:16px}.comments-header h5{color:var(--text);font-weight:600}.sort-options .form-select{background:var(--bg-soft);border:1px solid var(--border);color:var(--text);font-size:.9rem;padding:6px 12px;border-radius:8px}.sort-options .form-select:focus{border-color:var(--accent);box-shadow:0 0 0 .2rem #dc354540}.add-comment-section{padding:16px 0}.comment-input{background:var(--bg-soft);border:1px solid var(--border);color:var(--text);border-radius:20px;padding:12px 20px;font-size:.9rem}.comment-input:focus{background:var(--bg-soft);border-color:var(--accent);color:var(--text);box-shadow:0 0 0 .2rem #dc354540}.comment-input::placeholder{color:var(--muted)}.comment-item{padding:16px 0;border-bottom:1px solid var(--border)}.comment-item:last-child{border-bottom:none}.comment-author{color:var(--text);font-size:.9rem}.comment-time{font-size:.8rem}.comment-text{color:var(--text);line-height:1.5;margin:8px 0}.comment-actions .btn{padding:4px 12px;font-size:.8rem;border-radius:16px;background:transparent;border:1px solid var(--border);color:var(--muted);transition:all .2s ease}.comment-actions .btn:hover{background:#ffffff1a;color:var(--text);border-color:var(--muted)}.no-comments{background:var(--bg-soft);border-radius:12px;border:2px dashed var(--border)}.related-videos-sidebar{background:var(--bg-soft);padding:20px;border-radius:12px;border:1px solid var(--border);position:sticky;top:80px}.related-title{color:var(--text);font-weight:600;border-bottom:2px solid var(--accent);padding-bottom:12px}.related-video-item{transition:transform .2s ease}.related-video-item:hover{transform:translate(4px)}.category-filters{padding:0;margin-bottom:24px}.category-filters .btn{transition:all .2s 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6px;border-radius:6px;font-size:12px}.card-body{padding:12px}.card-title{font-size:14px;font-weight:500;line-height:1.3;margin-bottom:8px;color:var(--text)}.meta-muted{color:var(--muted);font-size:12px;line-height:1.4}.skeleton{background:linear-gradient(90deg,#ffffff0f,#ffffff1f,#ffffff0f);background-size:200% 100%;animation:shine 1.2s infinite}body.light .skeleton{background:linear-gradient(90deg,#0000000f,#0000001f,#0000000f)}@keyframes shine{0%{background-position:200% 0}to{background-position:-200% 0}}.video-player-wrapper{background:var(--card);border-radius:12px;overflow:hidden}@media (max-width: 992px){.sidebar{display:none}main{margin-left:0!important;padding:16px}.related-videos-sidebar{position:static;margin-top:20px}.video-title{font-size:1.3rem}}@media (max-width: 768px){main{padding:12px}.video-title{font-size:1.2rem}.action-buttons{flex-direction:column;gap:8px;width:100%}.action-btn{width:100%;justify-content:center}.channel-section{flex-direction:column;gap:16px;text-align:center}.subscribe-btn{width:100%}.comments-header{flex-direction:column;gap:12px;align-items:flex-start}.sort-options,.sort-options .form-select{width:100%}}@media (max-width: 991px){.sidebar{position:fixed;top:56px;left:0;height:100%;background:var(--bg);z-index:1100;transform:translate(-100%)}.sidebar.sidebar-open{transform:translate(0)}.sidebar-overlay{position:fixed;top:56px;left:0;width:100%;height:calc(100% - 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