:root {
            --bg-dark: #0f0f0f;
            --surface: #1f1f1f;
            --accent: #3ea6ff;
            --text-main: #ffffff;
            --text-dim: #aaaaaa;
            --border: #333333;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Segoe UI", Roboto, Arial, sans-serif;
        }

        body {
            background-color: var(--bg-dark);
            color: var(--text-main);
            padding-bottom: 50px;
            overflow-x: hidden;
        }

        .profile-container {
            max-width: 1284px;
            margin: 0 auto;
            padding: 32px 24px;
            display: flex;
            align-items: flex-start;
            justify-content: center;
            gap: 32px;
        }

        .avatar {
            width: 128px;
            height: 128px;
            background: #333;
            flex-shrink: 0;
            border-radius: 50%;
            overflow: hidden;
        }

        .avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .profile-info {
            max-width: 600px;
        }

        .profile-info h1 {
            font-size: clamp(24px, 5vw, 36px);
            margin-bottom: 4px;
        }

        .handle {
            color: var(--text-dim);
            font-size: 14px;
            margin-bottom: 12px;
        }

        .stats {
            color: var(--text-dim);
            font-size: 14px;
            margin-bottom: 16px;
        }

        .share-btn {
            margin-top: 20px;
            background-color: var(--text-main);
            color: black;
            border: none;
            padding: 10px 24px;
            font-weight: 600;
            cursor: pointer;
            border-radius: 0;
            width: fit-content;
        }

        .channel-tabs {
            max-width: 1284px;
            margin: 0 auto;
            padding: 0 24px;
            border-bottom: 1px solid var(--border);
            display: flex;
            justify-content: center;
            gap: 32px;
        }

        .tab {
            padding: 14px 0;
            color: var(--text-dim);
            cursor: pointer;
            font-weight: 500;
            position: relative;
            white-space: nowrap;
        }

        .tab.active {
            color: var(--text-main);
        }

        .tab.active::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--text-main);
        }

        .video-content {
            max-width: 1284px;
            margin: 24px auto;
            padding: 0 24px;
            display: flex;
            justify-content: center;
        }

        .video-grid {
            display: grid;
            /* 使用 auto-fit 代替 auto-fill，并在剩余空间居中 */
            grid-template-columns: repeat(auto-fit, 320px);
            gap: 20px;
            justify-content: center;
            width: 100%;
        }

        .short-grid {
            grid-template-columns: repeat(auto-fit, 180px);
        }

        .content-pane {
            display: none;
            width: 100%;
        }

        .content-pane.active {
            display: block;
        }

        .video-item {
            cursor: pointer;
            width: 100%;
            text-decoration: none;
            color: inherit;
            display: block;
        }

        .thumbnail-box {
            width: 100%;
            aspect-ratio: 16 / 9;
            background: var(--surface);
            position: relative;
            overflow: hidden;
        }

        .short-grid .thumbnail-box {
            aspect-ratio: 9 / 16;
        }

        .thumbnail-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .duration {
            position: absolute;
            bottom: 8px;
            right: 8px;
            background: rgba(0,0,0,0.8);
            padding: 2px 4px;
            font-size: 11px;
            font-weight: 500;
        }

        .video-details {
            padding: 10px 0;
        }

        .video-title {
            font-size: 14px;
            font-weight: 500;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        @media (max-width: 768px) {
            .profile-container { 
                flex-direction: column; 
                align-items: center; 
                text-align: center; 
                padding: 24px 16px;
                gap: 16px;
            }
            .video-grid {
                grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            }
            .short-grid {
                grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            }
        }

        @media (max-width: 480px) {
            .video-grid {
                grid-template-columns: 1fr;
            }
            .short-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
        }

        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: var(--bg-dark); }
        ::-webkit-scrollbar-thumb { background: #333; border-radius: 10px; }

        .video-date {
            color: var(--text-dim, #aaaaaa);
            font-size: 12px;
            margin-top: 4px;
        }