:root{--bg-color:#f9f9f9;--nav-bg:#fff;--text-primary:#0f0f0f;--text-secondary:#606060;--border-color:#e5e5e5;--hover-bg:#f2f2f2;--card-bg:transparent;--btn-bg:#f2f2f2;--btn-hover:#e5e5e5;--active-category-bg:#0f0f0f;--active-category-text:#fff;--search-border:#ccc;--search-bg:#fff}body.dark{--bg-color:#0f0f0f;--nav-bg:#0f0f0f;--text-primary:#f1f1f1;--text-secondary:#aaa;--border-color:#3f3f3f;--hover-bg:#272727;--card-bg:transparent;--btn-bg:#272727;--btn-hover:#3f3f3f;--active-category-bg:#f1f1f1;--active-category-text:#0f0f0f;--search-border:#303030;--search-bg:#121212}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);font-family:Roboto,Arial,sans-serif;transition:background-color .3s,color .3s}.app-container{flex-direction:column;min-height:100vh;display:flex}.navbar{background-color:var(--nav-bg);z-index:100;border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;height:56px;padding:0 16px;display:flex;position:sticky;top:0}.logo{cursor:pointer;align-items:center;gap:8px;display:flex}.logo-text{letter-spacing:-.5px;font-size:20px;font-weight:600;position:relative}.logo-text .super{color:var(--text-secondary);font-size:10px;position:absolute;top:0;right:-30px}.search-bar{flex:0 600px;align-items:center;height:40px;display:flex}.search-bar input{border:1px solid var(--search-border);background-color:var(--search-bg);height:100%;color:var(--text-primary);border-right:none;border-radius:20px 0 0 20px;outline:none;flex:1;padding:0 16px;font-size:16px}.search-bar input:focus{border:1px solid #1c62b9;margin-left:0}.search-btn{border:1px solid var(--search-border);background-color:var(--btn-bg);cursor:pointer;border-radius:0 20px 20px 0;justify-content:center;align-items:center;width:64px;height:100%;transition:background-color .2s;display:flex}.search-btn:hover{background-color:var(--btn-hover)}.nav-actions{align-items:center;gap:16px;display:flex}.theme-toggle{background-color:var(--btn-bg);color:var(--text-primary);cursor:pointer;border:none;border-radius:18px;padding:8px 16px;font-size:14px;font-weight:500;transition:background-color .2s}.theme-toggle:hover{background-color:var(--btn-hover)}.avatar-placeholder{color:#fff;background-color:#8e24aa;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:16px;font-weight:500;display:flex}.main-content{flex:1;padding:16px 24px}.categories-bar{scrollbar-width:none;gap:12px;margin-bottom:24px;padding-bottom:12px;display:flex;overflow-x:auto}.categories-bar::-webkit-scrollbar{display:none}.category-btn{background-color:var(--btn-bg);color:var(--text-primary);cursor:pointer;white-space:nowrap;border:none;border-radius:8px;padding:8px 12px;font-size:14px;font-weight:500;transition:background-color .2s}.category-btn:hover{background-color:var(--btn-hover)}.category-btn.active{background-color:var(--active-category-bg);color:var(--active-category-text)}.videos-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:40px 16px;margin-bottom:40px;display:grid}.video-card{background-color:var(--card-bg);cursor:pointer;flex-direction:column;gap:12px;width:100%;display:flex}.thumbnail-container{aspect-ratio:16/9;background-color:var(--btn-bg);border-radius:12px;width:100%;position:relative;overflow:hidden}.thumbnail{object-fit:cover;width:100%;height:100%;transition:transform .3s}.video-card:hover .thumbnail{transform:scale(1.02)}.duration{color:#fff;background-color:#000c;border-radius:4px;padding:3px 4px;font-size:12px;font-weight:500;line-height:12px;position:absolute;bottom:8px;right:8px}.video-info-container{align-items:flex-start;gap:12px;display:flex}.channel-avatar{flex-shrink:0;margin-top:4px}.channel-avatar .avatar-placeholder{background-color:#00897b;width:36px;height:36px}.video-details{flex-direction:column;display:flex;overflow:hidden}.video-title{color:var(--text-primary);-webkit-line-clamp:2;text-overflow:ellipsis;-webkit-box-orient:vertical;margin-bottom:4px;font-size:16px;font-weight:600;line-height:22px;display:-webkit-box;overflow:hidden}.channel-name,.video-meta{color:var(--text-secondary);font-size:14px;line-height:20px}.channel-name:hover{color:var(--text-primary)}.pagination{border-top:1px solid var(--border-color);justify-content:center;align-items:center;gap:16px;margin-top:20px;padding:20px 0;display:flex}.pagination-btn{color:#3ea6ff;border:1px solid var(--border-color);cursor:pointer;background-color:#0000;border-radius:18px;padding:8px 16px;font-size:14px;font-weight:500;transition:all .2s}.pagination-btn:hover:not(:disabled){background-color:var(--btn-hover);border-color:#0000}.pagination-btn:disabled{color:var(--text-secondary);cursor:not-allowed;opacity:.5}.page-indicator{color:var(--text-primary);font-weight:500}.loading-state{color:var(--text-secondary);flex-direction:column;justify-content:center;align-items:center;padding:60px 0;display:flex}.spinner{border:4px solid var(--border-color);border-top:4px solid #3ea6ff;border-radius:50%;width:40px;height:40px;margin-bottom:16px;animation:1s linear infinite spin}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media (width<=768px){.videos-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}.search-bar{display:none}}.video-detail-container{flex-direction:row;gap:24px;max-width:1600px;margin:0 auto;display:flex}@media (width<=1000px){.video-detail-container{flex-direction:column}}.video-player-section{flex:1;min-width:0}.video-player-wrapper{background-color:#000;border-radius:12px;width:100%;padding-bottom:56.25%;position:relative;overflow:hidden}.video-player-wrapper iframe{width:100%;height:100%;position:absolute;top:0;left:0}.video-info{margin-top:16px}.detail-title{color:var(--text-primary);margin-bottom:12px;font-size:20px;font-weight:700}.detail-meta{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:16px;display:flex}.detail-channel-info{align-items:center;gap:12px;display:flex}.detail-avatar{background-color:#d32f2f;flex-shrink:0;width:40px;height:40px}.detail-channel-text{flex-direction:column;display:flex}.detail-channel-name{color:var(--text-primary);font-size:16px;font-weight:600;line-height:1.2}.detail-subscriber-count{color:var(--text-secondary);margin-top:2px;font-size:12px}.join-btn{color:var(--text-primary);border:1px solid var(--border-color);cursor:pointer;background-color:#0000;border-radius:20px;margin-left:12px;padding:8px 16px;font-size:14px;font-weight:500;transition:background-color .2s}.join-btn:hover{background-color:var(--btn-hover)}.subscribe-btn{background-color:var(--btn-bg);color:var(--text-primary);cursor:pointer;border:none;border-radius:20px;align-items:center;margin-left:8px;padding:8px 16px;font-size:14px;font-weight:500;transition:background-color .2s;display:flex}.subscribe-btn:hover{background-color:var(--btn-hover)}.detail-actions{gap:8px;display:flex}.like-dislike-btn{background-color:var(--btn-bg);border-radius:20px;display:flex;overflow:hidden}.like-btn,.dislike-btn,.share-btn,.ask-btn,.save-btn,.more-btn{background:var(--btn-bg);color:var(--text-primary);cursor:pointer;border:none;border-radius:20px;align-items:center;gap:6px;padding:8px 16px;font-size:14px;font-weight:500;transition:background-color .2s;display:flex}.more-btn{border-radius:50%;padding:8px}.like-btn,.dislike-btn{background:0 0;border-radius:0}.like-btn:hover,.dislike-btn:hover,.share-btn:hover,.ask-btn:hover,.save-btn:hover,.more-btn:hover{background-color:var(--btn-hover)}.action-divider{background-color:var(--border-color);width:1px;margin:8px 0}.detail-description{background-color:var(--btn-bg);white-space:pre-wrap;border-radius:12px;padding:12px;font-size:14px;line-height:1.4}.views-date{color:var(--text-primary);margin-bottom:8px;font-weight:600}.desc-text{color:var(--text-primary)}.comments-section{margin-top:24px}.comments-header{align-items:center;gap:32px;margin-bottom:24px;display:flex}.comments-count{color:var(--text-primary);font-size:20px;font-weight:700}.sort-by-btn{color:var(--text-primary);cursor:pointer;background:0 0;border:none;align-items:center;font-size:14px;font-weight:500;display:flex}.suggestions-section{flex-shrink:0;width:400px}.sidebar-categories{margin-bottom:16px;padding-bottom:8px}@media (width<=1000px){.suggestions-section{width:100%}}.suggestions-list{flex-direction:column;gap:12px;display:flex}.video-card.horizontal-layout{flex-direction:row;gap:8px;height:100px}.horizontal-layout .thumbnail-container{border-radius:8px;flex-shrink:0;width:168px;height:94px}.horizontal-layout .duration{bottom:4px;right:4px}.horizontal-layout .video-info-container{flex:1;gap:0}.horizontal-layout .video-title{-webkit-line-clamp:2;margin-bottom:4px;font-size:14px;line-height:18px}.horizontal-layout .channel-name,.horizontal-layout .video-meta{font-size:12px;line-height:16px}