* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Noto Sans SC', sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(135deg, #1a3a5f 0%, #2c5a8a 100%);
            color: white;
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo h1 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-left: 15px;
        }
        
        .logo-icon {
            font-size: 2.5rem;
            color: #ffcc00;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav li {
            margin-left: 25px;
        }
        
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            font-size: 1.1rem;
            transition: all 0.3s ease;
            padding: 8px 12px;
            border-radius: 4px;
        }
        
        nav a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        
        /* Banner样式 */
        .banner {
            background: linear-gradient(rgba(26, 58, 95, 0.8), rgba(26, 58, 95, 0.9)), url('/images/photo-1504274066651-8d31a536b11a.avif');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: 100px 20px;
            margin-bottom: 60px;
        }
        
        .banner-content {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .banner h2 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        
        .banner p {
            font-size: 1.4rem;
            margin-bottom: 30px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .btn {
            display: inline-block;
            background-color: #ffcc00;
            color: #1a3a5f;
            padding: 12px 30px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            transition: all 0.3s ease;
            border: 2px solid #ffcc00;
        }
        
        .btn:hover {
            background-color: transparent;
            color: #ffcc00;
        }
        
        /* 服务优势部分 */
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 2.2rem;
            color: #1a3a5f;
            position: relative;
            display: inline-block;
            margin-bottom: 15px;
        }
        
        .section-title h2:after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 70px;
            height: 4px;
            background-color: #ffcc00;
        }
        
        .section-title p {
            color: #666;
            max-width: 700px;
            margin: 0 auto;
        }
        
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 60px;
        }
        
        .feature-card {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        
        .feature-icon {
            background-color: #1a3a5f;
            color: #ffcc00;
            font-size: 2.5rem;
            height: 100px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .feature-content {
            padding: 25px;
        }
        
        .feature-content h3 {
            font-size: 1.4rem;
            color: #1a3a5f;
            margin-bottom: 15px;
        }
        
        /* 标准参与部分 */
        .standards {
            background-color: #1a3a5f;
            color: white;
            padding: 70px 0;
            margin-bottom: 60px;
        }
        
        .standards-content {
            max-width: 900px;
            margin: 0 auto;
            text-align: center;
        }
        
        .standards-content h2 {
            font-size: 2.2rem;
            margin-bottom: 20px;
        }
        
        .standard-detail {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 10px;
            padding: 25px;
            margin: 30px 0;
            text-align: left;
        }
        
        .standard-detail h3 {
            color: #ffcc00;
            margin-bottom: 15px;
            font-size: 1.5rem;
        }
        
        .standard-detail ul {
            padding-left: 20px;
            margin-top: 15px;
        }
        
        .standard-detail li {
            margin-bottom: 10px;
        }
        
        /* 公司实力部分 */
        .strengths {
            margin-bottom: 60px;
        }
        
        .strength-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
        }
        
        .strength-item {
            text-align: center;
            padding: 30px 20px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        
        .strength-icon {
            font-size: 3rem;
            color: #1a3a5f;
            margin-bottom: 20px;
        }
        
        .strength-item h3 {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: #1a3a5f;
        }
        
        /* 联系部分 */
        .contact {
            background: linear-gradient(135deg, #1a3a5f 0%, #2c5a8a 100%);
            color: white;
            padding: 70px 0;
            text-align: center;
        }
        
        .contact h2 {
            font-size: 2.2rem;
            margin-bottom: 20px;
        }
        
        .contact-info {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 40px;
            margin: 40px 0;
        }
        
        .contact-item {
            display: flex;
            align-items: center;
            gap: 15px;
            font-size: 1.2rem;
        }
        
        .contact-icon {
            font-size: 2rem;
            color: #ffcc00;
        }
        
        /* 页脚 */
        footer {
            background-color: #0d2438;
            color: #aaa;
            padding: 40px 0 20px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .footer-section h3 {
            color: white;
            font-size: 1.4rem;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-section h3:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 2px;
            background-color: #ffcc00;
        }
        
        .footer-section ul {
            list-style: none;
        }
        
        .footer-section li {
            margin-bottom: 12px;
        }
        
        .footer-section a {
            color: #aaa;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        
        .footer-section a:hover {
            color: #ffcc00;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
            }
            
            nav ul {
                margin-top: 15px;
            }
            
            nav li {
                margin: 0 10px;
            }
            
            .banner h2 {
                font-size: 2rem;
            }
            
            .banner p {
                font-size: 1.1rem;
            }
        }
        
        @media (max-width: 480px) {
            nav ul {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            nav li {
                margin: 5px;
            }
            
            .banner {
                padding: 70px 20px;
            }
            
            .banner h2 {
                font-size: 1.8rem;
            }
        }