:root {
            --primary: #1a365d;
            --secondary: #2c5282;
            --accent: #e53e3e;
            --light: #f7fafc;
            --dark: #2d3748;
            --gray: #718096;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: var(--light);
            color: var(--dark);
            line-height: 1.6;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 导航样式 */
        header {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            font-size: 24px;
            font-weight: bold;
            color: var(--primary);
        }
        .logo img{
            height: 40px;
        }
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 30px;
        }
        
        .nav-links a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: var(--accent);
        }
        
        .auth-buttons {
            display: flex;
            gap: 10px;
        }
        
        .btn {
            padding: 8px 16px;
            border-radius: 4px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .btn-primary {
            background-color: var(--primary);
            color: white;
            border: none;
        }
        
        .btn-outline {
            background-color: transparent;
            color: var(--primary);
            border: 1px solid var(--primary);
        }
        
        /* Banner样式 */
         /*background: linear-gradient(135deg, var(--primary), var(--secondary));*/
        .banner {
            color: white;
            padding: 80px 0;
            text-align: center;
            background-image: url(../images/bg1.jpg) ;
            background-repeat: no-repeat;
            background-size: cover;
            min-height: 80vh;
            position: relative;
            display: flex;
            align-items: center;
        }
        
        .banner h1 {
            font-size: 48px;
            margin-bottom: 20px;
        }
        
        .banner p {
            font-size: 20px;
            max-width: 700px;
            margin: 0 auto 30px;
        }
        
        /* 产品展示 */
        .section {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 36px;
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        .section-title p {
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto;
        }
        
        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 30px;
        }
        
        .product-card {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s;
        }
        
        .product-card:hover {
            transform: translateY(-10px);
        }
        
        .product-img {
            height: 200px;
            background-color: #e2e8f0;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--gray);
        }
        
        .product-info {
            padding: 20px;
        }
        
        .product-info h3 {
            margin-bottom: 10px;
            color: var(--primary);
        }
        
        .product-meta {
            display: flex;
            justify-content: space-between;
            color: var(--gray);
            font-size: 14px;
            margin-bottom: 15px;
        }
        
        /* 案例展示 */
        .cases-container {
            background-color: #edf2f7;
            padding: 50px 0;
        }
        
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
        }
        
        .case-card {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        
        .case-content {
            padding: 20px;
        }
        
        .case-content h3 {
            margin-bottom: 10px;
            color: var(--primary);
        }
        
        /* 新闻资讯 */
        .news-container {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 40px;
        }
        
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        
        .news-item {
            display: flex;
            gap: 20px;
            padding-bottom: 20px;
            border-bottom: 1px solid #e2e8f0;
        }
        
        .news-img {
            width: 120px;
            height: 90px;
            background-color: #e2e8f0;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--gray);
        }
        
        .news-content h3 {
            margin-bottom: 8px;
            color: var(--primary);
        }
        
        .news-date {
            color: var(--gray);
            font-size: 14px;
            margin-bottom: 8px;
        }
        
        /* 联系我们 */
        .contact-section {
            background-color: #edf2f7;
        }
        
        .contact-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
        }
        
        .contact-info h3 {
            margin-bottom: 20px;
            color: var(--primary);
        }
        
        .contact-details {
            margin-bottom: 30px;
        }
        
        .contact-details p {
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }
        
        .contact-form .form-group {
            margin-bottom: 20px;
        }
        
        .contact-form label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
        }
        
        .contact-form input,
        .contact-form textarea,
        .contact-form select {
            width: 100%;
            padding: 12px;
            border: 1px solid #cbd5e0;
            border-radius: 4px;
            font-size: 16px;
        }
        
        .contact-form textarea {
            height: 150px;
            resize: vertical;
        }
        
        /* 页脚 */
        footer {
            background-color: var(--primary);
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
        }
        
        .footer-col h3 {
            margin-bottom: 20px;
            font-size: 18px;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #cbd5e0;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #a0aec0;
        }
        
        .copyright p{
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        /* 响应式设计 */
        @media (max-width: 992px) {
            .news-container,
            .contact-container,
            .footer-container {
                grid-template-columns: 1fr;
            }
            
            .footer-container {
                gap: 30px;
            }
        }
        
        @media (max-width: 768px) {
            .nav-container {
                flex-direction: column;
                gap: 15px;
            }
            
            .nav-links {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .nav-links li {
                margin: 5px 15px;
            }
            
            .banner h1 {
                font-size: 36px;
            }
            
            .banner p {
                font-size: 18px;
            }
            
            .section {
                padding: 50px 0;
            }
        }