:root {
            --primary-color: #0066cc;
            --primary-dark: #0052a3;
            --secondary-color: #00a8ff;
            --light-color: #f8f9fa;
            --dark-color: #333;
            --gray-color: #6c757d;
            --border-color: #e9ecef;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: 'Noto Sans SC', 'Roboto', sans-serif;
            line-height: 1.6;
            color: var(--dark-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: var(--dark-color);
        }
        
        p {
            margin-bottom: 1rem;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        
        ul {
            list-style: none;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .section {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            display: inline-block;
            position: relative;
        }
        
        .section-title h2:after {
            content: '';
            position: absolute;
            width: 70px;
            height: 4px;
            background-color: var(--primary-color);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        
        .section-subtitle {
            text-align: center;
            color: var(--gray-color);
            max-width: 700px;
            margin: 0 auto 30px;
            font-size: 1.1rem;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 4px;
            font-weight: 500;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        
        .btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        
        .btn-outline {
            background-color: transparent;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
        }
        
        .btn-outline:hover {
            background-color: var(--primary-color);
            color: white;
        }
        
        /* 头部样式 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            z-index: 1000;
            padding: 15px 0;
            transition: var(--transition);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        
        .logo i {
            margin-right: 10px;
            font-size: 2rem;
        }
        
        .nav-menu {
            display: flex;
        }
        
        .nav-menu li {
            margin-left: 30px;
        }
        
        .nav-menu a {
            font-weight: 500;
            position: relative;
            padding: 5px 0;
        }
        
        .nav-menu a:after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background-color: var(--primary-color);
            bottom: 0;
            left: 0;
            transition: var(--transition);
        }
        
        .nav-menu a:hover:after,
        .nav-menu a.active:after {
            width: 100%;
        }
        
        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--primary-color);
        }
        
        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--primary-color);
        }
        
        /* 面包屑导航 */
        .breadcrumb {
            background-color: var(--light-color);
            padding: 20px 0;
            margin-top: 80px;
        }
        
        .breadcrumb-content {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
        }
        
        .breadcrumb a {
            color: var(--gray-color);
            margin-right: 10px;
        }
        
        .breadcrumb a:hover {
            color: var(--primary-color);
        }
        
        .breadcrumb span {
            margin-right: 10px;
            color: var(--gray-color);
        }
        
        .breadcrumb .current {
            color: var(--primary-color);
            font-weight: 500;
        }
        
        /* SEO页面头部 */
        .seo-header {
            padding: 100px 0 60px;
            background: linear-gradient(135deg, rgba(0, 102, 204, 0.1) 0%, rgba(0, 168, 255, 0.05) 100%);
            text-align: center;
        }
        
        .seo-header h1 {
            font-size: 3.5rem;
            margin-bottom: 20px;
            color: var(--dark-color);
        }
        
        .seo-header p {
            font-size: 1.3rem;
            color: var(--gray-color);
            max-width: 800px;
            margin: 0 auto;
        }
        
        /* SEO服务介绍 */
        .seo-intro {
            padding: 80px 0;
        }
        
        .intro-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 50px;
        }
        
        .intro-text {
            flex: 1;
            min-width: 300px;
        }
        
        .intro-text h2 {
            font-size: 2.2rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 15px;
        }
        
        .intro-text h2:after {
            content: '';
            position: absolute;
            width: 60px;
            height: 3px;
            background-color: var(--primary-color);
            bottom: 0;
            left: 0;
        }
        
        .intro-image {
            flex: 1;
            min-width: 300px;
            text-align: center;
        }
        
        .intro-image img {
            max-width: 100%;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        
        /* SEO服务优势 */
        .seo-benefits {
            background-color: var(--light-color);
            padding: 80px 0;
        }
        
        .benefits-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
        }
        
        .benefit-card {
            background-color: white;
            border-radius: 8px;
            padding: 40px 30px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .benefit-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        
        .benefit-icon {
            width: 70px;
            height: 70px;
            background-color: rgba(0, 102, 204, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
        }
        
        .benefit-icon i {
            font-size: 2rem;
            color: var(--primary-color);
        }
        
        .benefit-card h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
        }
        
        /* SEO服务内容 */
        .seo-services {
            padding: 80px 0;
        }
        
        .services-tabs {
            max-width: 1000px;
            margin: 0 auto;
        }
        
        .tabs-nav {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            margin-bottom: 40px;
            gap: 10px;
        }
        
        .tab-btn {
            padding: 12px 25px;
            background-color: var(--light-color);
            border: none;
            border-radius: 4px;
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .tab-btn:hover {
            background-color: rgba(0, 102, 204, 0.1);
            color: var(--primary-color);
        }
        
        .tab-btn.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        .tab-content {
            display: none;
            background-color: white;
            border-radius: 8px;
            padding: 40px;
            box-shadow: var(--shadow);
        }
        
        .tab-content.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .service-details h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: var(--primary-color);
        }
        
        .service-details ul {
            margin-bottom: 25px;
        }
        
        .service-details li {
            margin-bottom: 10px;
            padding-left: 25px;
            position: relative;
        }
        
        .service-details li:before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--primary-color);
            font-weight: bold;
        }
        
        /* SEO服务流程 */
        .seo-process {
            background-color: var(--light-color);
            padding: 80px 0;
        }
        
        .process-steps {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 30px;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .process-step {
            flex: 1;
            min-width: 250px;
            max-width: 280px;
            background-color: white;
            border-radius: 8px;
            padding: 30px;
            text-align: center;
            box-shadow: var(--shadow);
            position: relative;
        }
        
        .step-number {
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 700;
            margin: 0 auto 20px;
        }
        
        .process-step h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
        }
        
        /* SEO案例展示 */
        .seo-cases {
            padding: 80px 0;
        }
        
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
        }
        
        .case-card {
            background-color: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .case-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        
        .case-image {
            height: 200px;
            overflow: hidden;
        }
        
        .case-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .case-card:hover .case-image img {
            transform: scale(1.05);
        }
        
        .case-content {
            padding: 25px;
        }
        
        .case-tag {
            display: inline-block;
            padding: 5px 12px;
            background-color: rgba(0, 102, 204, 0.1);
            color: var(--primary-color);
            border-radius: 4px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 15px;
        }
        
        .case-content h3 {
            font-size: 1.4rem;
            margin-bottom: 15px;
        }
        
        .case-stats {
            display: flex;
            justify-content: space-between;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
        }
        
        .stat-item {
            text-align: center;
        }
        
        .stat-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 5px;
        }
        
        .stat-label {
            font-size: 0.9rem;
            color: var(--gray-color);
        }
        
        /* SEO价格方案 */
        .seo-pricing {
            background-color: var(--light-color);
            padding: 80px 0;
        }
        
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            max-width: 1000px;
            margin: 0 auto;
        }
        
        .pricing-card {
            background-color: white;
            border-radius: 8px;
            padding: 40px 30px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: var(--transition);
            position: relative;
        }
        
        .pricing-card.featured {
            transform: scale(1.05);
            border: 2px solid var(--primary-color);
        }
        
        .pricing-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        
        .pricing-card.featured:hover {
            transform: translateY(-10px) scale(1.05);
        }
        
        .pricing-badge {
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background-color: var(--primary-color);
            color: white;
            padding: 6px 15px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
        }
        
        .pricing-title {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: var(--primary-color);
        }
        
        .pricing-price {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--dark-color);
        }
        
        .pricing-period {
            font-size: 1rem;
            color: var(--gray-color);
        }
        
        .pricing-features {
            margin: 25px 0;
        }
        
        .pricing-features li {
            margin-bottom: 10px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
        }
        
        .pricing-features li:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }
        
        /* SEO常见问题 */
        .seo-faq {
            padding: 80px 0;
        }
        
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            background-color: white;
            border-radius: 8px;
            margin-bottom: 15px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        
        .faq-question {
            padding: 20px 25px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 500;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        
        .faq-question:hover {
            background-color: rgba(0, 102, 204, 0.05);
        }
        
        .faq-question.active {
            color: var(--primary-color);
            background-color: rgba(0, 102, 204, 0.05);
        }
        
        .faq-toggle {
            transition: var(--transition);
        }
        
        .faq-question.active .faq-toggle {
            transform: rotate(180deg);
            color: var(--primary-color);
        }
        
        .faq-answer {
            padding: 0 25px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }
        
        .faq-answer.active {
            padding: 0 25px 25px;
            max-height: 500px;
        }
        
        /* SEO相关文章区域 */
        .seo-articles {
            padding: 80px 0;
            background-color: var(--light-color);
        }
        
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
            margin-bottom: 50px;
        }
        
        .article-card {
            background-color: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        
        .article-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        
        .article-image {
            height: 200px;
            overflow: hidden;
        }
        
        .article-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .article-card:hover .article-image img {
            transform: scale(1.05);
        }
        
        .article-content {
            padding: 25px;
        }
        
        .article-category {
            display: inline-block;
            padding: 5px 12px;
            background-color: rgba(0, 102, 204, 0.1);
            color: var(--primary-color);
            border-radius: 4px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 15px;
        }
        
        .article-title {
            font-size: 1.4rem;
            margin-bottom: 15px;
            line-height: 1.4;
        }
        
        .article-title a:hover {
            color: var(--primary-color);
        }
        
        .article-excerpt {
            color: var(--gray-color);
            margin-bottom: 20px;
            line-height: 1.6;
        }
        
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
        }
        
        .article-date {
            font-size: 0.9rem;
            color: var(--gray-color);
        }
        
        .article-read-more {
            color: var(--primary-color);
            font-weight: 500;
            display: inline-flex;
            align-items: center;
        }
        
        .article-read-more i {
            margin-left: 5px;
            transition: var(--transition);
        }
        
        .article-read-more:hover i {
            transform: translateX(5px);
        }
        
        .articles-footer {
            text-align: center;
        }
        
        /* CTA区域 */
        .seo-cta {
            padding: 80px 0;
            background: linear-gradient(135deg, rgba(0, 102, 204, 0.1) 0%, rgba(0, 168, 255, 0.05) 100%);
            text-align: center;
        }
        
        .cta-content {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .cta-content h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
        }
        
        .cta-content p {
            font-size: 1.2rem;
            color: var(--gray-color);
            margin-bottom: 30px;
        }
        
        /* 页脚 */
        footer {
            background-color: #2c3e50;
            color: white;
            padding: 70px 0 30px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 50px;
        }
        
        .footer-column h3 {
            color: white;
            font-size: 1.5rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3:after {
            content: '';
            position: absolute;
            width: 50px;
            height: 3px;
            background-color: var(--primary-color);
            bottom: 0;
            left: 0;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        
        .contact-info li {
            display: flex;
            align-items: flex-start;
            margin-bottom: 20px;
        }
        
        .contact-info i {
            margin-right: 15px;
            color: var(--secondary-color);
            font-size: 1.2rem;
            margin-top: 5px;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .section-title h2 {
                font-size: 2.2rem;
            }
            
            .seo-header h1 {
                font-size: 2.8rem;
            }
            
            .pricing-card.featured {
                transform: none;
            }
            
            .pricing-card.featured:hover {
                transform: translateY(-10px);
            }
            
            .articles-grid {
                grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            }
        }
        
        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: white;
                flex-direction: column;
                align-items: center;
                padding: 20px 0;
                box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
                z-index: 999;
            }
            
            .nav-menu.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            
            .nav-menu li {
                margin: 15px 0;
            }
            
            .mobile-toggle {
                display: block;
            }
            
            .seo-header h1 {
                font-size: 2.3rem;
            }
            
            .tabs-nav {
                flex-direction: column;
                align-items: center;
            }
            
            .tab-btn {
                width: 100%;
                max-width: 300px;
            }
            
            .cta-content h2 {
                font-size: 2rem;
            }
            
            .articles-grid {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 576px) {
            .section {
                padding: 60px 0;
            }
            
            .seo-header {
                padding: 80px 0 40px;
            }
            
            .seo-header h1 {
                font-size: 2rem;
            }
            
            .case-grid,
            .benefits-grid {
                grid-template-columns: 1fr;
            }
        }