.product-page-container {
        display: flex;
        max-width: 1200px;
        margin: 30px auto;
        padding: 0 15px;
    }
    
    /* Left Navigation - 保持不变 */
    .product-nav {
        width: 250px;
        background: white;
        border-radius: 5px;
        box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        padding: 20px;
        margin-right: 30px;
        position: sticky;
        top: 20px;
        height: fit-content;
    }
    
    .product-nav h2 {
        font-size: 18px;
        margin-bottom: 15px;
        padding-bottom: 10px;
        border-bottom: 1px solid #eee;
        color: #333;
    }
    
    .product-nav ul {
        list-style: none;
        padding: 0;
    }
    
    .product-nav li {
        margin-bottom: 10px;
    }
    
    .product-nav a {
        display: block;
        padding: 8px 10px;
        color: #555;
        text-decoration: none;
        border-radius: 4px;
        transition: all 0.3s ease;
    }
    
    .product-nav a:hover, 
    .product-nav a.active {
        background-color: #f0f0f0;
        color: #2a6496;
    }
    
    /* 右侧内容区域 - 调整以适应导航 */
    .product-content {
        flex: 1;
        font-family: Arial, sans-serif;
        line-height: 1.6;
        color: #333;
    }
    
    .header1 {
        background: linear-gradient(135deg, #1a3e72 0%, #0d2342 100%);
        color: white;
        padding: 60px 20px;
        text-align: center;
        margin-bottom: 30px;
        border-radius: 5px;
    }
    
    .header1 h1 {
        font-size: 2.5rem;
        margin: 0 0 15px 0;
        font-weight: 700;
    }
    
    .header1 p {
        font-size: 1.2rem;
        margin: 0;
        opacity: 0.9;
        max-width: 700px;
        margin-left: auto;
        margin-right: auto;
    }
    
    h2 {
        color: #1a3e72;
        border-bottom: 2px solid #1a3e72;
        padding-bottom: 10px;
        margin-top: 30px;
        font-size: 1.8rem;
    }
    
    .process-container {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        margin: 30px 0;
    }
    
    .process-step {
        flex-basis: 18%;
        text-align: center;
        margin-bottom: 25px;
    }
    
    .step-number {
        background-color: #1a3e72;
        color: white;
        width: 40px;
        height: 40px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 15px;
        font-size: 1.2em;
        font-weight: bold;
    }
    
    ul {
        padding-left: 20px;
    }
    
    li {
        margin-bottom: 8px;
    }
    
    /* 响应式调整 */
    @media (max-width: 1024px) {
        .process-step {
            flex-basis: 30%;
        }
    }
    
    @media (max-width: 768px) {
        .product-page-container {
            flex-direction: column;
        }
        
        .product-nav {
            width: 100%;
            position: static;
            margin: 0 0 30px 0;
        }
        
        .product-nav ul {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        
        .product-nav li {
            margin-bottom: 0;
        }
        
        .process-step {
            flex-basis: 48%;
        }
        
        .header1 {
            padding: 40px 20px;
        }
        
        .header1 h1 {
            font-size: 2rem;
        }
    }
    
    @media (max-width: 480px) {
        .process-step {
            flex-basis: 100%;
        }
    }