:root {
            --primary-color: #1E4E42;
            --text-color: #333;
        }
        
        body {
            font-family: Arial, sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            margin: 0;
            padding: 0;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        .section-title {
            color: var(--primary-color);
            font-size: 40px;
            text-align: center;
            margin-bottom: 30px;
            font-weight: 600;
        }
        
        .section-subtitle {
            font-size: 28px;
            color: #1E4E42;
            margin: 60px 0 30px;
            padding-bottom: 10px;
            border-bottom: 2px solid #1E4E42;
            font-weight: 500;
        }
        
        .description {
            font-size: 16px;
            margin-bottom: 30px;
            text-align: center;
            max-width: 1200px;

    width: 100%;
    padding: 0 20px; /* 与container的padding一致 */
    margin: 0 auto 30px;
    box-sizing: border-box; /* 包含padding在内的宽度计算 */
        }
        
        .certificate-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
            margin-bottom: 40px;
        }
        
        .certificate-item {
            width: calc(25% - 20px);
            text-align: center;
            margin-bottom: 20px;
        }
        
        .certificate-border {
            border: 15px solid #f5f5f5;
            border-radius: 5px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            padding: 10px;
            background-color: white;
            margin-bottom: 15px;
            transition: transform 0.3s ease;
        }
        
        .certificate-border:hover {
            transform: translateY(-5px);
        }


        .certificate-img-container {
            aspect-ratio: 1/1.414; /* 标准A4纸比例 (1:√2) */
            width: 100%;
            overflow: hidden;
            display: flex;
            justify-content: center;
            align-items: center;
            background: #f9f9f9; /* 可选：添加背景色 */
        }        

  
        .certificate-img {
            width: 100%;
            height: 100%;
            object-fit: contain; 
        }
        
        .certificate-name {
            font-weight: 500;
            color: var(--primary-color);
        }
        
        .slider-container {
            position: relative;
            width: 100%;
            overflow: hidden;
        }
        
        .slider {
            display: flex;
            transition: transform 0.5s ease;
        }
        
        .slider-btn {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            background-color: rgba(30, 78, 66, 0.7);
            color: white;
            border: none;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            font-size: 20px;
            cursor: pointer;
            z-index: 10;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .slider-btn:hover {
            background-color: var(--primary-color);
        }
        
        .prev {
            left: 10px;
        }
        
        .next {
            right: 10px;
        }
        
        /* Mobile styles */
        @media (max-width: 768px) {
            .section-title {
                font-size: 24px;
            }
            
            .section-subtitle {
                font-size: 18px;
            }
            
            .description {
                font-size: 14px;
            }
            
            .certificate-item {
                width: calc(50% - 15px);
            }
        }