:root{--bg-primary: #0f0f0f;--bg-secondary: #212121;--bg-hover: #3d3d3d;--text-primary: #f1f1f1;--text-secondary: #aaaaaa;--accent-color: #ff0000;--accent-hover: #cc0000;--border-color: rgba(255, 255, 255, .1);--glass-bg: rgba(33, 33, 33, .8);--font-family: "Inter", "Roboto", system-ui, -apple-system, sans-serif;--header-height: 56px;--sidebar-width-expanded: 240px;--sidebar-width-collapsed: 72px;--transition-fast: .15s ease;--transition-normal: .3s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;overflow-y:overlay}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--bg-hover);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}a{color:inherit;text-decoration:none}button{cursor:pointer;background:none;border:none;font-family:inherit;color:inherit}input{font-family:inherit}.glass{background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color)}.flex-center{display:flex;align-items:center;justify-content:center}.text-ellipsis{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.line-clamp-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.app-container{display:flex;flex-direction:column;height:100vh}.main-layout{display:flex;flex:1;overflow:hidden;margin-top:var(--header-height)}.main-content{flex:1;overflow-y:auto;padding:24px}.header{position:fixed;top:0;left:0;right:0;height:var(--header-height);display:flex;align-items:center;justify-content:space-between;padding:0 16px;z-index:100}.header-left,.header-right{display:flex;align-items:center;gap:16px}.logo-link{display:flex;align-items:center;gap:6px;font-size:1.1rem;font-weight:700;letter-spacing:-.5px}.icon-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;color:var(--text-primary);transition:var(--transition-fast)}.icon-btn:hover{background-color:var(--bg-hover)}.header-center{flex:1;max-width:600px;margin:0 40px}.search-box{display:flex;align-items:center;background-color:#121212;border:1px solid var(--bg-hover);border-radius:40px;overflow:hidden;height:40px}.search-box input{flex:1;background:transparent;border:none;color:var(--text-primary);padding:0 16px;font-size:1rem;outline:none}.search-box input:focus{border:1px solid #1c62b9;margin:-1px}.search-btn{width:64px;height:100%;background-color:var(--bg-secondary);border-left:1px solid var(--bg-hover);display:flex;align-items:center;justify-content:center;transition:var(--transition-fast)}.search-btn:hover{background-color:var(--bg-hover)}.login-btn{display:flex;align-items:center;gap:8px;padding:6px 16px;border:1px solid var(--bg-hover);border-radius:32px;color:#3ea6ff;font-weight:600;font-size:.9rem;transition:var(--transition-fast)}.login-btn:hover{background-color:#3ea6ff1a;border-color:transparent}.user-avatar{width:32px;height:32px;border-radius:50%;object-fit:cover;cursor:pointer}.sidebar{width:var(--sidebar-width-expanded);background-color:var(--bg-primary);flex-shrink:0;display:flex;flex-direction:column}.sidebar-scrollable{flex:1;overflow-y:auto;padding:12px}.sidebar-scrollable::-webkit-scrollbar{width:8px}.sidebar-scrollable:hover::-webkit-scrollbar-thumb{background:var(--bg-hover);border-radius:4px}.sidebar-link{display:flex;align-items:center;gap:20px;padding:10px 12px;border-radius:10px;color:var(--text-primary);font-size:.95rem;transition:background-color var(--transition-fast);margin-bottom:4px}.sidebar-link:hover{background-color:var(--bg-hover)}.sidebar-link.active{background-color:var(--bg-hover);font-weight:500}.sidebar-icon{flex-shrink:0}.sidebar-link.active .sidebar-icon{fill:currentColor}.sidebar-divider{height:1px;background-color:var(--border-color);margin:12px 0}@media(max-width:768px){.sidebar{width:var(--sidebar-width-collapsed)}.sidebar span{display:none}.sidebar-link{justify-content:center;padding:16px 0}}@media(max-width:480px){.sidebar{display:none}}.video-card{display:flex;flex-direction:column;gap:12px;cursor:pointer;transition:transform var(--transition-normal)}.thumbnail-container{position:relative;width:100%;aspect-ratio:16 / 9;border-radius:12px;overflow:hidden;background-color:var(--bg-hover)}.thumbnail{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-normal)}.thumbnail.hovered{transform:scale(1.05)}.duration{position:absolute;bottom:8px;right:8px;background-color:#000c;color:#fff;padding:3px 4px;border-radius:4px;font-size:.75rem;font-weight:500}.play-preview{position:absolute;top:8px;right:8px;background-color:#000000b3;color:#fff;padding:4px 8px;border-radius:4px;font-size:.75rem;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.video-info{display:flex;gap:12px;align-items:flex-start}.channel-avatar{width:36px;height:36px;border-radius:50%;object-fit:cover;flex-shrink:0;margin-top:4px}.video-text{display:flex;flex-direction:column;gap:4px}.video-title{font-size:1rem;font-weight:600;color:var(--text-primary);line-height:1.4;margin:0}.channel-name,.video-meta{font-size:.85rem;color:var(--text-secondary);margin:0}.channel-name:hover{color:var(--text-primary)}.home-container{display:flex;flex-direction:column;gap:24px}.category-pills{position:sticky;top:0;display:flex;gap:12px;z-index:10;overflow-x:auto;border-bottom:1px solid var(--border-color);margin:-24px -24px 0;padding:12px 24px}.category-pills::-webkit-scrollbar{display:none}.pill{padding:6px 12px;border-radius:8px;background-color:var(--bg-secondary);color:var(--text-primary);font-size:.9rem;font-weight:500;white-space:nowrap;transition:var(--transition-fast)}.pill:hover{background-color:var(--bg-hover)}.pill.active{background-color:var(--text-primary);color:var(--bg-primary)}.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px 16px}@media(max-width:600px){.video-grid{grid-template-columns:1fr}}.watch-container{display:flex;gap:24px;max-width:1600px;margin:0 auto}.watch-main{flex:1;min-width:0}.watch-sidebar{width:400px;flex-shrink:0}.player-wrapper{width:100%;aspect-ratio:16/9;background-color:#000;border-radius:12px;overflow:hidden;margin-bottom:16px;position:relative}.mock-player{width:100%;height:100%;position:relative}.player-placeholder{width:100%;height:100%;object-fit:cover;opacity:.7}.play-button-overlay{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:68px;height:48px;background-color:#000c;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:24px;cursor:pointer;transition:var(--transition-fast)}.mock-player:hover .play-button-overlay{background-color:var(--accent-color)}.watch-title{font-size:1.25rem;font-weight:700;margin-bottom:12px}.watch-actions-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;flex-wrap:wrap;gap:16px}.channel-info{display:flex;align-items:center;gap:12px}.watch-avatar{width:40px;height:40px;border-radius:50%;object-fit:cover}.channel-text h3{font-size:1rem;font-weight:600}.channel-text p{font-size:.8rem;color:var(--text-secondary)}.subscribe-btn{background-color:var(--text-primary);color:var(--bg-primary);padding:10px 16px;border-radius:24px;font-weight:600;font-size:.9rem;margin-left:12px}.subscribe-btn:hover{background-color:#d1d1d1}.action-buttons{display:flex;gap:8px}.action-group{display:flex;background-color:var(--bg-secondary);border-radius:20px;overflow:hidden}.action-group .divider{width:1px;background-color:var(--border-color);margin:8px 0}.action-btn{display:flex;align-items:center;gap:8px;padding:8px 16px;background-color:var(--bg-secondary);border-radius:20px;font-weight:600;font-size:.9rem;transition:var(--transition-fast)}.action-group .action-btn{border-radius:0;background-color:transparent}.action-group .action-btn:hover,.action-btn:hover{background-color:var(--bg-hover)}.action-btn.active{color:var(--text-primary)}.action-btn.icon-only{border-radius:50%;padding:8px;width:36px;height:36px;justify-content:center}.watch-description{background-color:var(--bg-secondary);padding:16px;border-radius:12px;font-size:.95rem;margin-bottom:24px}.views-date{font-weight:600;margin-bottom:8px}.desc-text{white-space:pre-wrap}.related-list{display:flex;flex-direction:column;gap:12px}.section-title{margin-bottom:16px;font-size:1.1rem}.related-card{display:flex;gap:8px;cursor:pointer}.related-thumb-wrapper{position:relative;width:168px;flex-shrink:0;border-radius:8px;overflow:hidden}.related-thumb{width:100%;aspect-ratio:16/9;object-fit:cover}.related-info{display:flex;flex-direction:column;gap:4px}.related-info h4{font-size:.9rem;font-weight:600;margin:0;line-height:1.3}.related-info p{font-size:.8rem;color:var(--text-secondary);margin:0}@media(max-width:1000px){.watch-container{flex-direction:column}.watch-sidebar{width:100%}}.history-container{display:flex;gap:32px;max-width:1400px;margin:0 auto}.history-main{flex:1}.history-sidebar{width:350px;flex-shrink:0;display:flex;flex-direction:column;gap:16px}.page-title{font-size:1.5rem;margin-bottom:24px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:60vh;text-align:center;gap:16px}.empty-icon{margin-bottom:16px;color:var(--text-secondary)}.history-list{display:flex;flex-direction:column;gap:16px}.history-card{display:flex;gap:16px;padding-bottom:16px;border-bottom:1px solid var(--border-color);transition:background-color var(--transition-fast)}.history-card:hover{background-color:var(--bg-secondary);border-radius:8px;border-bottom-color:transparent}.h-thumb-wrapper{position:relative;width:240px;flex-shrink:0;border-radius:8px;overflow:hidden}.h-thumb{width:100%;aspect-ratio:16/9;object-fit:cover}.h-info{display:flex;flex-direction:column;gap:6px;padding:4px 0}.h-info h3{font-size:1.1rem;font-weight:500;margin:0}.h-channel{color:var(--text-secondary);font-size:.85rem;margin:0}.h-desc{color:var(--text-secondary);font-size:.85rem;margin-top:4px}.h-time{font-size:.75rem;color:#3ea6ff;margin-top:auto}.search-history input{width:100%;background:transparent;border:none;border-bottom:1px solid var(--text-secondary);color:var(--text-primary);padding:8px 0;font-size:.95rem;outline:none}.search-history input:focus{border-bottom-color:var(--text-primary)}.clear-btn{display:flex;align-items:center;gap:8px;padding:10px 16px;border-radius:20px;font-size:.9rem;font-weight:500;color:var(--text-primary);transition:var(--transition-fast)}.clear-btn:hover{background-color:var(--bg-hover)}@media(max-width:900px){.history-container{flex-direction:column-reverse}.history-sidebar{width:100%;margin-bottom:24px}.h-thumb-wrapper{width:160px}}.modal-overlay{position:fixed;inset:0;background-color:#000000b3;display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .2s ease}.modal-content{background-color:var(--bg-secondary);border-radius:16px;padding:40px;width:100%;max-width:400px;position:relative;box-shadow:0 10px 40px #00000080;animation:slideUp .3s cubic-bezier(.4,0,.2,1)}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.close-btn{position:absolute;top:16px;right:16px;color:var(--text-secondary);padding:8px;border-radius:50%;transition:var(--transition-fast)}.close-btn:hover{background-color:var(--bg-hover);color:var(--text-primary)}.modal-header{display:flex;flex-direction:column;align-items:center;text-align:center;gap:16px;margin-bottom:32px}.modal-header h2{font-size:1.5rem;font-weight:500}.modal-header p{color:var(--text-secondary);font-size:.95rem}.auth-form{display:flex;flex-direction:column;gap:20px}.auth-form input{padding:12px 16px;border-radius:8px;border:1px solid var(--border-color);background-color:var(--bg-primary);color:var(--text-primary);font-size:1rem}.auth-form input:focus{border-color:#3ea6ff;outline:none}.submit-btn{background-color:#3ea6ff;color:#0f0f0f;padding:12px;border-radius:24px;font-weight:600;font-size:1rem;transition:var(--transition-fast)}.submit-btn:hover:not(:disabled){background-color:#65b8ff}.submit-btn:disabled{background-color:var(--bg-hover);color:var(--text-secondary);cursor:not-allowed}