body {
            background-color: #f5f7f9;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            border-radius: 10px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            margin-top: 20px;
            margin-bottom: 20px;
        }
header {
			    background: linear-gradient(135deg, #2c3e50, #4a6572);
			    color: white;
			    padding: 5px;
			    text-align: center;
				font-size:25px;
			}
			
			.tabs {
			    display: flex;
			    background: #e8ebf0;
			    border-bottom: 1px solid #d1d9e6;
			}
			
			.tab-btn {
			    flex: 1;
			    padding: 15px;
			    text-align: center;
			    background: #e8ebf0;
			    border: none;
			    cursor: pointer;
			    font-size: 16px;
			    font-weight: 500;
			    transition: all 0.3s;
			    border-bottom: 3px solid transparent;
			    text-decoration: none;
			    color: #333;
			}
			
			.tab-btn:hover {
			    background: #dbe0e8;
			}
			
			.tab-btn.active {
			    background: white;
			    border-bottom: 3px solid #0d6efd;
			    color: #0d6efd;
			}
			footer {
			    text-align: center;
			    padding: 20px;
			    color: #6c757d;
			    font-size: 14px;
			    border-top: 1px solid #d1d9e6;
			    margin-top: 20px;
			}
			
	 		body {
			    font-family: Arial, sans-serif;
			    max-width: 1000px;
			    margin: 0 auto;
			    padding: 20px;
			    background-color: #f9f9f9;
			}
			 
			.video-container {
			    width: 100%;
			    background-color: #333;
			    border-radius: 8px;
			    overflow: hidden;
			    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
			}
			
			#mainVideo {
			    width: 100%;
			    display: block;
			}
			
			.video-list {
			    list-style: none;
			    padding: 0;
			    margin: 20px 0 0 0;
			}
			
			.video-list li {
			    display: flex;
			    align-items: center;
			    padding: 15px;
			    border: 1px solid #eee;
			    border-radius: 6px;
			    margin-bottom: 10px;
			    background-color: #fff;
			    cursor: pointer;
			    transition: all 0.3s ease;
			}
			
			.video-list li:hover {
			    background-color: #f0f7ff;
			    transform: translateY(-2px);
			    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
			}
			
			/* 当前播放项高亮样式 */
			.video-list li.active {
			    background-color: #e6f7ff;
			    border-color: #91d5ff;
			}
			
			.video-thumb {
			    width: 120px;
			    height: 70px;
			    background-color: #ccc;
			    margin-right: 15px;
			    border-radius: 4px;
			    overflow: hidden;
			    position: relative;
			    flex-shrink: 0;
			}
			
			.video-thumb::after {
			    content: "▶";
			    position: absolute;
			    top: 50%;
			    left: 50%;
			    transform: translate(-50%, -50%);
			    color: white;
			    font-size: 24px;
			    text-shadow: 0 0 5px rgba(0,0,0,0.5);
			}
			
			.video-info {
			    flex: 1;
			}
			
			.video-title {
			    font-weight: 600;
			    margin: 0 0 5px 0;
			    color: #333;
			}
			
			.video-meta {
			    font-size: 14px;
			    color: #666;
			    margin: 0 0 5px 0;
			}
			
			.video-desc {
			    font-size: 14px;
			    color: #444;
			    margin: 0;
			    line-height: 1.4;
			}