:root{--dtube-primary: #223154;--dtube-accent: #F01A30;--dtube-dark: #262626;--dtube-bg: #f5f5f5;--dtube-bg-card: #ffffff;--dtube-text: #212121;--dtube-muted: #777777;--dtube-night: #111111;--dtube-night-card: #1d1d1d;--dtube-night-text: #F0F0F0;--dtube-sidebar-w: 224px;--dtube-topbar-h: 56px}.dtube-sidebar{position:fixed;left:0;top:var(--dtube-topbar-h);width:var(--dtube-sidebar-w);height:calc(100vh - var(--dtube-topbar-h));background:var(--dtube-bg-card);border-right:1px solid #e5e7eb;overflow-y:auto;z-index:40}.dark .dtube-sidebar{background:var(--dtube-night-card);border-color:#374151}.dtube-nav-item{display:flex;align-items:center;gap:12px;padding:10px 24px;font-size:14px;font-weight:500;color:var(--dtube-text);cursor:pointer;text-decoration:none;transition:background .15s}.dtube-nav-item:hover{background:#f3f4f6}.dark .dtube-nav-item:hover{background:#1f2937}.dtube-nav-item.active{color:var(--dtube-accent);background:#fef2f2}.dark .dtube-nav-item.active{background:#f01a3026}.dtube-topbar{position:fixed;top:0;left:0;right:0;height:var(--dtube-topbar-h);background:var(--dtube-bg-card);border-bottom:1px solid #e5e7eb;z-index:50;display:flex;align-items:center;padding:0 16px;gap:16px}.dark .dtube-topbar{background:var(--dtube-night-card);border-color:#374151}.dtube-content{margin-left:var(--dtube-sidebar-w);margin-top:var(--dtube-topbar-h);padding:24px;min-height:calc(100vh - var(--dtube-topbar-h));background:var(--dtube-bg)}.dark .dtube-content{background:#000}.dtube-slider-row{display:flex;gap:12px;overflow-x:auto;padding-bottom:8px}.dtube-slider-row::-webkit-scrollbar{height:6px}.dtube-slider-row::-webkit-scrollbar-track{background:transparent}.dtube-slider-row::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:9999px}.dark .dtube-slider-row::-webkit-scrollbar-thumb{background:#4b5563}.dtube-section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.dtube-section-title{font-size:18px;font-weight:600;color:var(--dtube-text)}.dark .dtube-section-title{color:var(--dtube-night-text)}.dtube-video-card{cursor:pointer;overflow:hidden;border-radius:8px}@media(max-width:1023px){.dtube-sidebar{display:none}.dtube-content{margin-left:0}}