/* 九宫格视频布局样式 - 3x3排列，垂直水平居中 */
        .nine-grid-container {
            width: 100%;
            max-width: 1000px;
            margin: 0 auto;
            padding: 5px 0;
            box-sizing: border-box;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .grid-row {
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 20px;
            width: 100%;
            box-sizing: border-box;
        }
        
        .grid-row:last-child {
            margin-bottom: 0;
        }
        
        .grid-item {
            flex: 0 0 calc(33.333% - 20px);
            max-width: calc(33.333% - 20px);
            height: 200px;
            margin: 0 10px;
            box-sizing: border-box;
            background: linear-gradient(135deg, #f8f8f8 0%, #f0f0f0 100%);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            transition: all 0.4s ease;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
            cursor: pointer;
        }
        
        .grid-item:hover {
            transform: translateY(-5px) scale(1.02);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
            background: linear-gradient(135deg, #f0f0f0 0%, #e8e8e8 100%);
        }
        
        .video-item {
            width: 95%;
            height: 95%;
            object-fit: cover;
            border-radius: 8px;
            display: block;
            transition: all 0.3s ease;
        }
        
        .grid-item:hover .video-item {
            transform: scale(1.05);
        }
        
        /* 播放按钮样式 */
        .play-button {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 60px;
            height: 60px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
            z-index: 10;
        }
        
        .play-button::before {
            content: '';
            width: 0;
            height: 0;
            border-left: 15px solid #333;
            border-top: 10px solid transparent;
            border-bottom: 10px solid transparent;
            margin-left: 5px;
        }
        
        .play-button:hover {
            background: rgba(255, 255, 255, 1);
            transform: translate(-50%, -50%) scale(1.1);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
        }
        
        /* 响应式设计 */
        @media screen and (max-width: 1200px) {
            .grid-item {
                flex: 0 0 calc(33.333% - 15px);
                max-width: calc(33.333% - 15px);
                height: 180px;
                margin: 0 7.5px;
            }
            
            .grid-row {
                margin-bottom: 15px;
            }
            
            .play-button {
                width: 50px;
                height: 50px;
            }
            
            .play-button::before {
                border-left: 12px solid #333;
                border-top: 8px solid transparent;
                border-bottom: 8px solid transparent;
            }
        }
        
        @media screen and (max-width: 1024px) {
            .grid-item {
                flex: 0 0 calc(33.333% - 12px);
                max-width: calc(33.333% - 12px);
                height: 160px;
                margin: 0 6px;
            }
            
            .nine-grid-container {
                max-width: 900px;
            }
            
            .play-button {
                width: 45px;
                height: 45px;
            }
            
            .play-button::before {
                border-left: 10px solid #333;
                border-top: 7px solid transparent;
                border-bottom: 7px solid transparent;
            }
        }
        
        @media screen and (max-width: 768px) {
            .grid-row {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .grid-item {
                flex: 0 0 calc(50% - 15px);
                max-width: calc(50% - 15px);
                height: 150px;
                margin: 7.5px;
            }
            
            .nine-grid-container {
                max-width: 600px;
            }
            
            .play-button {
                width: 40px;
                height: 40px;
            }
            
            .play-button::before {
                border-left: 9px solid #333;
                border-top: 6px solid transparent;
                border-bottom: 6px solid transparent;
            }
        }
        
        @media screen and (max-width: 600px) {
            .grid-item {
                flex: 0 0 calc(100% - 20px);
                max-width: calc(100% - 20px);
                height: 180px;
                margin: 10px;
            }
            
            .grid-row {
                margin-bottom: 10px;
            }
            
            .nine-grid-container {
                padding: 15px 0;
            }
        }
        
        @media screen and (max-width: 480px) {
            .grid-item {
                height: 160px;
            }
            
            .nine-grid-container {
                padding: 10px 0;
            }
        }
        
        /* 动画效果 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .grid-item {
            animation: fadeInUp 0.6s ease forwards;
        }
        
        .grid-item:nth-child(1) { animation-delay: 0.1s; }
        .grid-item:nth-child(2) { animation-delay: 0.2s; }
        .grid-item:nth-child(3) { animation-delay: 0.3s; }
        .grid-item:nth-child(4) { animation-delay: 0.4s; }
        .grid-item:nth-child(5) { animation-delay: 0.5s; }
        .grid-item:nth-child(6) { animation-delay: 0.6s; }
        .grid-item:nth-child(7) { animation-delay: 0.7s; }
        .grid-item:nth-child(8) { animation-delay: 0.8s; }
        .grid-item:nth-child(9) { animation-delay: 0.9s; }