:root {
            --primary: #2563eb;
            --primary-light: #eff6ff;
            --primary-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
            --secondary: #10b981;
            --secondary-light: #ecfdf5;
            --accent: #f59e0b;
            --text-main: #1f2937;
            --text-muted: #4b5563;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --border-color: #e2e8f0;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
        }

        body {
            line-height: 1.6;
        }

        /* 统一页面容器 */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 导航栏 */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-area img {
            height: 40px;
            width: auto;
        }

        .logo-text {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
        }

        .nav-menu {
            display: flex;
            gap: 20px;
            list-style: none;
        }

        .nav-menu a {
            text-decoration: none;
            color: var(--text-muted);
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.3s;
        }

        .nav-menu a:hover {
            color: var(--primary);
        }

        .nav-btn {
            background: var(--primary-gradient);
            color: white !important;
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .nav-btn:hover {
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--text-main);
        }

        /* Hero首屏 - 严禁出现图片 */
        .hero-section {
            background: radial-gradient(circle at top right, #e0f2fe 0%, #ffffff 70%);
            padding: 100px 0 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-badge {
            display: inline-block;
            background-color: var(--primary-light);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 24px;
            border: 1px solid rgba(37, 99, 237, 0.15);
        }

        .hero-section h1 {
            font-size: 2.75rem;
            font-weight: 800;
            line-height: 1.25;
            color: #0f172a;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }

        .hero-section p {
            font-size: 1.125rem;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto 36px auto;
        }

        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 50px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            text-decoration: none;
            transition: all 0.2s ease-in-out;
            cursor: pointer;
        }

        .btn-primary {
            background: var(--primary-gradient);
            color: white;
            box-shadow: 0 4px 14px rgba(37, 99, 237, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37, 99, 237, 0.6);
        }

        .btn-secondary {
            background-color: var(--bg-white);
            color: var(--text-main);
            border: 1px solid var(--border-color);
        }

        .btn-secondary:hover {
            background-color: var(--bg-light);
            transform: translateY(-2px);
        }

        /* 数据指标卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-top: 40px;
        }

        .stat-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 24px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            transition: transform 0.2s;
        }

        .stat-card:hover {
            transform: translateY(-4px);
        }

        .stat-num {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .stat-label {
            font-size: 0.875rem;
            color: var(--text-muted);
        }

        /* 通用区块样式 */
        section {
            padding: 80px 0;
        }

        .section-light {
            background-color: var(--bg-white);
        }

        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 50px auto;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 16px;
        }

        .section-subtitle {
            color: var(--text-muted);
            font-size: 1rem;
        }

        /* 关于我们 / 平台介绍 */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .about-content h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: #0f172a;
        }

        .about-content p {
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .about-features {
            list-style: none;
        }

        .about-features li {
            position: relative;
            padding-left: 28px;
            margin-bottom: 12px;
            color: var(--text-main);
            font-weight: 500;
        }

        .about-features li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--secondary);
            font-weight: bold;
        }

        .about-image-container {
            background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
            border-radius: var(--radius-lg);
            padding: 30px;
            box-shadow: var(--shadow-sm);
        }

        /* 服务能力卡片 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .service-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 32px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            transition: all 0.3s;
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }

        .service-icon {
            width: 50px;
            height: 50px;
            background-color: var(--primary-light);
            color: var(--primary);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
            color: #0f172a;
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* 标签云 */
        .tag-cloud-container {
            margin-top: 40px;
            background: var(--bg-light);
            padding: 30px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
        }

        .tag-cloud-title {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 20px;
            text-align: center;
            color: var(--text-main);
        }

        .tags-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }

        .tag-item {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: all 0.2s;
        }

        .tag-item:hover {
            background-color: var(--primary);
            color: white;
            border-color: var(--primary);
            transform: scale(1.05);
        }

        /* 流程步骤 */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 30px;
            position: relative;
        }

        .step-card {
            background-color: var(--bg-white);
            padding: 30px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
        }

        .step-num {
            width: 40px;
            height: 40px;
            background: var(--primary-gradient);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin: 0 auto 20px auto;
        }

        .step-card h3 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }

        .step-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* 对比评测表格 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background-color: var(--bg-white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 800px;
        }

        .compare-table th, .compare-table td {
            padding: 16px 24px;
            border-bottom: 1px solid var(--border-color);
        }

        .compare-table th {
            background-color: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }

        .compare-table tr:last-child td {
            border-bottom: none;
        }

        .compare-table tr:hover {
            background-color: var(--bg-light);
        }

        .rating-box {
            background-color: #fffbeb;
            border: 1px solid #fef3c7;
            padding: 24px;
            border-radius: var(--radius-lg);
            margin-top: 30px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
        }

        .rating-left {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .rating-stars {
            color: var(--accent);
            font-size: 1.5rem;
        }

        .rating-score {
            font-size: 2rem;
            font-weight: 800;
            color: #b45309;
        }

        /* 案例展示 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .case-card {
            background-color: var(--bg-white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: transform 0.2s;
        }

        .case-card:hover {
            transform: translateY(-4px);
        }

        .case-img-wrap {
            width: 100%;
            height: 200px;
            overflow: hidden;
            background-color: #f1f5f9;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .case-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .case-body {
            padding: 24px;
        }

        .case-tag {
            display: inline-block;
            background-color: var(--primary-light);
            color: var(--primary);
            padding: 4px 10px;
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
        }

        .case-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
            color: #0f172a;
        }

        .case-body p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* FAQ折叠面板 */
        .faq-wrapper {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color 0.3s;
        }

        .faq-item:hover {
            border-color: var(--primary);
        }

        .faq-btn {
            width: 100%;
            padding: 20px;
            background: none;
            border: none;
            text-align: left;
            font-size: 1rem;
            font-weight: 600;
            color: #0f172a;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
        }

        .faq-content {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease-out;
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        .faq-item.active .faq-content {
            padding: 0 20px 20px 20px;
            max-height: 300px;
        }

        .faq-icon::after {
            content: "+";
            font-size: 1.25rem;
            color: var(--primary);
            font-weight: bold;
        }

        .faq-item.active .faq-icon::after {
            content: "−";
        }

        /* 客户评论 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .review-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 24px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
        }

        .review-text {
            font-style: italic;
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 0.95rem;
        }

        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .author-avatar {
            width: 44px;
            height: 44px;
            background-color: var(--primary-light);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        .author-info h4 {
            font-size: 0.95rem;
            color: #0f172a;
        }

        .author-info p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* 价格卡片 */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .price-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 36px 30px;
            text-align: center;
            position: relative;
            box-shadow: var(--shadow-sm);
        }

        .price-card.featured {
            border-color: var(--primary);
            box-shadow: var(--shadow-lg);
        }

        .price-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background-color: var(--secondary);
            color: white;
            font-size: 0.75rem;
            padding: 4px 10px;
            border-radius: 50px;
            font-weight: 600;
        }

        .price-card h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
        }

        .price-num {
            font-size: 2.25rem;
            font-weight: 800;
            color: #0f172a;
            margin-bottom: 24px;
        }

        .price-num span {
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-muted);
        }

        .price-features {
            list-style: none;
            margin-bottom: 30px;
            text-align: left;
        }

        .price-features li {
            padding: 8px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* 需求表单与联系方式 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 40px;
        }

        .form-card {
            background-color: var(--bg-white);
            padding: 40px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 8px;
            font-size: 0.9rem;
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            transition: border-color 0.2s;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
        }

        .contact-info-card {
            background-color: var(--primary-light);
            border: 1px solid rgba(37, 99, 237, 0.1);
            padding: 40px;
            border-radius: var(--radius-lg);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .info-item {
            margin-bottom: 24px;
        }

        .info-title {
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
        }

        .info-desc {
            color: var(--text-main);
        }

        .qr-codes {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .qr-item {
            text-align: center;
        }

        .qr-item img {
            width: 100%;
            max-width: 110px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            padding: 4px;
            background-color: white;
        }

        .qr-item p {
            font-size: 0.75rem;
            margin-top: 8px;
            color: var(--text-muted);
        }

        /* 资讯与知识库 */
        .articles-list {
            list-style: none;
        }

        .articles-list li {
            border-bottom: 1px solid var(--border-color);
            padding: 16px 0;
        }

        .articles-list a {
            text-decoration: none;
            color: var(--text-main);
            font-weight: 600;
            display: block;
            transition: color 0.2s;
        }

        .articles-list a:hover {
            color: var(--primary);
        }

        .articles-list p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* 友情链接与底部 */
        footer {
            background-color: #0f172a;
            color: #f1f5f9;
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-logo img {
            height: 36px;
            margin-bottom: 16px;
        }

        .footer-col h4 {
            color: white;
            font-size: 1rem;
            margin-bottom: 20px;
            position: relative;
        }

        .footer-col h4::after {
            content: "";
            position: absolute;
            bottom: -6px;
            left: 0;
            width: 30px;
            height: 2px;
            background-color: var(--primary);
        }

        .footer-col ul {
            list-style: none;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s;
        }

        .footer-col ul a:hover {
            color: white;
        }

        .friend-links {
            border-top: 1px solid #1e293b;
            padding-top: 24px;
            margin-top: 20px;
            text-align: center;
        }

        .friend-links p {
            color: #64748b;
            font-size: 0.8rem;
            margin-bottom: 10px;
        }

        .friend-links-list {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 15px;
        }

        .friend-links-list a {
            color: #94a3b8;
            text-decoration: none;
            font-size: 0.8rem;
            transition: color 0.2s;
        }

        .friend-links-list a:hover {
            color: var(--primary);
        }

        .copyright-area {
            border-top: 1px solid #1e293b;
            padding-top: 24px;
            margin-top: 30px;
            text-align: center;
            color: #64748b;
            font-size: 0.8rem;
        }

        /* 悬浮窗设计 */
        .sticky-contact {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .sticky-btn {
            background-color: var(--primary);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            text-decoration: none;
            transition: transform 0.2s, background-color 0.2s;
            cursor: pointer;
            border: none;
            position: relative;
        }

        .sticky-btn:hover {
            transform: translateY(-2px);
            background-color: #1d4ed8;
        }

        .sticky-btn .tooltip {
            position: absolute;
            right: 60px;
            background-color: #0f172a;
            color: white;
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.75rem;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.2s;
            box-shadow: var(--shadow-md);
        }

        .sticky-btn:hover .tooltip {
            opacity: 1;
        }

        .sticky-qr {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: white;
            border: 1px solid var(--border-color);
            padding: 10px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-lg);
            display: none;
            text-align: center;
            width: 140px;
        }

        .sticky-qr img {
            width: 120px;
            height: 120px;
        }

        .sticky-qr p {
            font-size: 0.7rem;
            color: var(--text-main);
            margin-top: 4px;
        }

        .sticky-btn-qr:hover .sticky-qr {
            display: block;
        }

        /* 移动端响应式微调 */
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: white;
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                gap: 15px;
                box-shadow: var(--shadow-md);
            }

            .nav-menu.show {
                display: flex;
            }

            .menu-toggle {
                display: block;
            }

            .hero-section h1 {
                font-size: 2rem;
            }

            .about-grid, .contact-grid {
                grid-template-columns: 1fr;
            }

            .hero-buttons {
                flex-direction: column;
                align-items: center;
            }

            .hero-buttons .btn {
                width: 100%;
                max-width: 300px;
            }
        }