/* 管理在线video style */    
    .page-title {
            text-align: center;
            margin: 30px 0 40px;
            color: #2c3e50;
            font-weight: 700;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.1);
            position: relative;
        }

        .page-title::after {
            content: "";
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }

        .video-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 57px;
        }

        .video-card {
            background: var(--card-bg);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            height: 100%;
            transform: translateY(-10px);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
        }

      

        .thumbnail {
            position: relative;
            width: 100%;
            padding-top: 56.25%; 
            overflow: hidden;
        }

        .thumbnail img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .thumbnail .play-icon {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 60px;
            height: 60px;
            background: rgba(255, 255, 255, 0.8);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: var(--transition);
        }

        .thumbnail .play-icon i {
            color: var(--primary-color);
            
            margin-left: 4px;
        }

        .video-card:hover .play-icon {
            opacity: 1;
        }

        .video-info {
            padding: 20px;
            flex-grow: 1;
        }

        .video-title {
   
            font-weight: 400;
            margin-bottom: 12px;
            color: #2c3e50;
            text-align: center;
        }

        .video-meta {
            display: flex;
            justify-content: space-between;
            color: #7f8c8d;
           
            margin-top: 15px;
            padding-top: 15px;
            border-top: 1px solid #eee;
        }

        .channel {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #7f8c8d;
             
            margin-bottom: 10px;
        }

        .channel img {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            object-fit: cover;
        }

        .duration {
            position: absolute;
            bottom: 10px;
            right: 10px;
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 4px 8px;
            border-radius: 4px;
           
        }

        /* 响应式设计 */
        @media (max-width: 992px) {
            .video-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .video-grid {
                grid-template-columns: 1fr;
                max-width: 600px;
                margin: 30px auto;
            }
            
            .page-title {
                
            }
        }

        /* 加载更多按钮 */
        .load-more {
            text-align: center;
            margin: 50px 0 30px;
        }

        .btn {
            display: inline-block;
            padding: 14px 36px;
            background: var(--primary-color);
            color: white;
            border: none;
            border-radius: 30px;
            
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
        }

        .btn:hover {
            background: #2980b9;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(52, 152, 219, 0.5);
        }