* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-image: url('../img/haibaoqiang.png');
            background-size: cover; /* 关键属性：确保背景图片覆盖整个区域 */
            background-position: center center; /* 图片居中显示 */
            background-repeat: no-repeat; /* 不重复图片 */
            background-attachment: fixed; /* 背景固定，不随内容滚动 */
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            padding: 20px;
            position: relative;
        }
        
        /* 添加半透明遮罩层，提高文字可读性 */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4); /* 半透明黑色遮罩 */
            z-index: -1;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
        }
        
        .header {
            text-align: center;
            margin-bottom: 30px;
            color: white;
        }
        
        .header h1 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 10px;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
        }
        
        .header p {
            font-size: 1.1rem;
            opacity: 0.9;
        }
        
        .search-section {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 25px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            margin-bottom: 30px;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .search-box {
            position: relative;
            width: 100%;
        }
        
        .search-input {
            width: 100%;
            padding: 18px 20px;
            font-size: 1.1rem;
            border: none;
            border-radius: 50px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            outline: none;
        }
        
        .search-input:focus {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
        }
        
        .search-button {
            position: absolute;
            right: 5px;
            top: 5px;
            background: #2575fc;
            color: white;
            border: none;
            border-radius: 50px;
            padding: 13px 25px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .search-button:hover {
            background: #1a68e3;
            transform: translateY(-2px);
            box-shadow: 0 7px 20px rgba(0, 0, 0, 0.3);
        }
        
        .browser-window {
            background: white;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
            height: 600px;
            display: flex;
            flex-direction: column;
            position: relative;
        }
        
        .browser-header {
            background: #2c3e50;
            padding: 15px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid #34495e;
        }
        
        .video-title {
            color: white;
            font-size: 1.3rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .fullscreen-btn {
            background: #3498db;
            color: white;
            border: none;
            border-radius: 5px;
            padding: 8px 15px;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 5px;
        }
        
        .fullscreen-btn:hover {
            background: #2980b9;
        }
        
        .browser-content {
            flex: 1;
            border: none;
            width: 100%;
            height: 100%;
        }
        
        .browser-content.fullscreen {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            z-index: 1000;
            border-radius: 0;
        }
        
        .placeholder-content {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            height: 100%;
            color: #666;
            text-align: center;
            padding: 40px;
            background: #f8f9fa;
        }
        
        .placeholder-content i {
            font-size: 4rem;
            margin-bottom: 20px;
            opacity: 0.5;
        }
        
        .placeholder-content h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
        }
        
        .features {
            display: flex;
            justify-content: space-between;
            margin-top: 30px;
            flex-wrap: wrap;
        }
        
        .feature {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 20px;
            width: 24%;
            margin-bottom: 15px;
            text-align: center;
            color: white;
            transition: transform 0.3s ease;
            text-decoration: none;
            display: block;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .feature:hover {
            transform: translateY(-5px);
            background: rgba(255, 255, 255, 0.15);
        }
        
        .feature-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 15px;
            display: block;
            border-radius: 8px;
        }

        .footer {
            margin-top: 30px;
            text-align: center;
            color: #ffffff;
            font-size: 14px;
            padding: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.2);
            width: 100%;
        }
        
        /* 响应式布局调整 - 确保最小屏幕下也保持一排两个 */
        @media (max-width: 900px) {
            .feature {
                width: 48%;
            }
        }
        
        @media (max-width: 600px) {
            .feature {
                width: 48%; /* 保持一排两个 */
            }
            
            .header h1 {
                font-size: 2rem;
            }
            
            .browser-window {
                height: 400px;
            }
            
            .feature-icon {
                width: 40px;
                height: 40px;
            }
            
            .feature h4 {
                font-size: 1rem;
            }
            
            .feature p {
                font-size: 0.85rem;
            }
        }