:root {
            --primary: #0d9488;
            --primary-dark: #0f766e;
            --primary-light: #ccfbf1;
            --secondary: #06b6d4;
            --text-dark: #0f172a;
            --text-muted: #475569;
            --bg-light: #f8fafc;
            --bg-accent: #f0fdfa;
            --white: #ffffff;
            --border: #e2e8f0;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow: 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);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans CJK SC", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 顶部导航 */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

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

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

        .ai-page-logo {
            height: 40px;
            width: auto;
        }

        .logo-text {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary-dark);
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

        .nav-menu a {
            text-decoration: none;
            color: var(--text-muted);
            font-weight: 500;
            font-size: 0.9rem;
            transition: var(--transition);
        }

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

        .nav-btn {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            padding: 8px 16px;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.9rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }

        .nav-btn:hover {
            opacity: 0.9;
            transform: translateY(-1px);
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
        }

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--text-dark);
            border-radius: 3px;
            transition: var(--transition);
        }

        /* 统一的 Section 样式 */
        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border);
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-title h2 {
            font-size: 2.25rem;
            color: var(--text-dark);
            margin-bottom: 15px;
            font-weight: 800;
            position: relative;
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 2px;
        }

        .section-title p {
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 700px;
            margin: 0 auto;
        }

        /* 1. Hero 区域 - 首屏无图，纯科技感渐变 */
        .hero {
            padding-top: 150px;
            padding-bottom: 100px;
            background: radial-gradient(circle at 10% 20%, rgba(204, 251, 241, 0.4) 0%, rgba(248, 250, 252, 1) 90%);
            position: relative;
            overflow: hidden;
            text-align: center;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: linear-gradient(rgba(13, 148, 136, 0.05) 1px, transparent 1px),
                              linear-gradient(90deg, rgba(13, 148, 136, 0.05) 1px, transparent 1px);
            background-size: 40px 40px;
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 900px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 3rem;
            line-height: 1.2;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: 24px;
        }

        .hero h1 span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 1.25rem;
            color: var(--text-muted);
            margin-bottom: 40px;
            line-height: 1.8;
        }

        .hero-btn-group {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .hero-btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            padding: 14px 32px;
            font-size: 1.1rem;
            font-weight: 600;
            border-radius: 8px;
            text-decoration: none;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .hero-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .hero-btn-secondary {
            background: var(--white);
            color: var(--primary-dark);
            border: 2px solid var(--primary);
            padding: 12px 30px;
            font-size: 1.1rem;
            font-weight: 600;
            border-radius: 8px;
            text-decoration: none;
            transition: var(--transition);
        }

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

        /* 2. 关于我们与平台介绍 */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.75rem;
            color: var(--primary-dark);
            margin-bottom: 20px;
        }

        .about-text p {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 1rem;
        }

        .about-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
            margin-top: 30px;
        }

        .about-list li {
            position: relative;
            padding-left: 25px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-dark);
        }

        .about-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--primary);
            font-weight: bold;
        }

        /* 宣传图展示 */
        .about-visual {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .ai-page-image {
            border-radius: 12px;
            box-shadow: var(--shadow-lg);
            width: 100%;
            object-fit: cover;
            border: 1px solid var(--border);
            transition: var(--transition);
        }

        .ai-page-image:hover {
            transform: scale(1.02);
        }

        /* 3. 数据指标卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            margin-top: 40px;
        }

        .stat-card {
            background: var(--white);
            padding: 30px 20px;
            border-radius: 12px;
            text-align: center;
            box-shadow: var(--shadow);
            border-top: 4px solid var(--primary);
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-dark);
            margin-bottom: 10px;
        }

        .stat-title {
            font-size: 1rem;
            color: var(--text-muted);
            font-weight: 600;
        }

        /* 4. 全平台AIGC服务 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background: var(--white);
            padding: 40px 30px;
            border-radius: 12px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .service-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            transform: scaleX(0);
            transform-origin: left;
            transition: var(--transition);
        }

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

        .service-card:hover::after {
            transform: scaleX(1);
        }

        .service-icon {
            font-size: 2.5rem;
            margin-bottom: 20px;
            display: inline-block;
        }

        .service-card h3 {
            font-size: 1.35rem;
            color: var(--text-dark);
            margin-bottom: 15px;
            font-weight: 700;
        }

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

        /* 支持的 AI 平台标签云 */
        .tags-wrapper {
            margin-top: 60px;
            background: var(--white);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .tags-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 25px;
            text-align: center;
        }

        .tags-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
        }

        .tag-item {
            background: var(--bg-light);
            color: var(--primary-dark);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            border: 1px solid var(--border);
            transition: var(--transition);
        }

        .tag-item:hover {
            background: var(--primary-light);
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        /* 5. 一站式AIGC制作 & 素材区 */
        .prod-layout {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
            align-items: center;
        }

        .prod-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .prod-feat-item {
            background: var(--white);
            padding: 24px;
            border-radius: 10px;
            border-left: 4px solid var(--secondary);
            box-shadow: var(--shadow-sm);
        }

        .prod-feat-item h4 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

        .prod-feat-item p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .prod-gallery {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .prod-gallery-item {
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
        }

        .prod-gallery-item img {
            width: 100%;
            height: auto;
            display: block;
            object-fit: cover;
            transition: var(--transition);
        }

        .prod-gallery-item:hover img {
            transform: scale(1.03);
        }

        /* 6. 全行业解决方案 */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .sol-card {
            background: var(--white);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .sol-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        .sol-card-body {
            padding: 30px;
        }

        .sol-card-body h3 {
            font-size: 1.25rem;
            color: var(--text-dark);
            margin-bottom: 12px;
            font-weight: 700;
        }

        .sol-card-body p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 20px;
        }

        .sol-card-link {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        /* 7. 全国服务网络 (使用时间线/列表组件表示) */
        .network-section {
            background: var(--bg-accent);
        }

        .network-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .timeline {
            position: relative;
            padding-left: 30px;
            border-left: 2px solid var(--primary-light);
        }

        .timeline-item {
            position: relative;
            margin-bottom: 40px;
        }

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -39px;
            top: 5px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--primary);
            border: 4px solid var(--bg-accent);
        }

        .timeline-time {
            font-weight: 700;
            color: var(--primary-dark);
            margin-bottom: 5px;
        }

        .timeline-title {
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 5px;
        }

        .timeline-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
        }

        .city-badge-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }

        .city-badge {
            background: var(--white);
            border: 1px solid var(--border);
            padding: 10px 20px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            box-shadow: var(--shadow-sm);
        }

        /* 8. 标准化AIGC流程 & 9. 技术标准 */
        .flow-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-bottom: 60px;
        }

        .flow-step {
            background: var(--white);
            padding: 30px 20px;
            border-radius: 12px;
            text-align: center;
            border: 1px solid var(--border);
            position: relative;
        }

        .flow-step-num {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            margin: 0 auto 20px auto;
        }

        .flow-step h4 {
            font-size: 1.1rem;
            margin-bottom: 10px;
            color: var(--text-dark);
        }

        .flow-step p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .standards-box {
            background: var(--bg-light);
            border: 1px solid var(--border);
            padding: 30px;
            border-radius: 12px;
        }

        .standards-box h3 {
            margin-bottom: 20px;
            color: var(--text-dark);
            font-size: 1.5rem;
        }

        .standards-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .standard-item {
            background: var(--white);
            padding: 20px;
            border-radius: 8px;
            border-left: 4px solid var(--primary);
        }

        .standard-item h5 {
            font-size: 1rem;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

        .standard-item p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* 10. 客户案例中心 */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-card {
            background: var(--white);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        .case-img-placeholder {
            height: 180px;
            background: linear-gradient(135deg, var(--primary-light), var(--bg-accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-dark);
            font-weight: 700;
        }

        .case-content {
            padding: 24px;
        }

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

        .case-content h4 {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--text-dark);
        }

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

        /* 11. 对比评测 - 突出 9.9分 五星 */
        .eval-section {
            background: var(--bg-accent);
        }

        .eval-grid {
            display: grid;
            grid-template-columns: 1fr 1.5fr;
            gap: 50px;
            align-items: center;
        }

        .eval-summary {
            background: var(--white);
            padding: 40px;
            border-radius: 16px;
            box-shadow: var(--shadow-lg);
            text-align: center;
            border: 1px solid var(--border);
        }

        .eval-score {
            font-size: 4rem;
            font-weight: 800;
            color: var(--primary-dark);
            line-height: 1;
            margin-bottom: 10px;
        }

        .eval-max {
            font-size: 1.25rem;
            color: var(--text-muted);
        }

        .eval-stars {
            color: #f59e0b;
            font-size: 1.75rem;
            margin: 15px 0;
        }

        .eval-label {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-dark);
        }

        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border-radius: 12px;
            box-shadow: var(--shadow);
            background: var(--white);
        }

        .eval-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 600px;
        }

        .eval-table th, .eval-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border);
            font-size: 0.95rem;
        }

        .eval-table th {
            background: var(--primary-light);
            color: var(--primary-dark);
            font-weight: 700;
        }

        .eval-table td strong {
            color: var(--primary-dark);
        }

        /* 12. Token比价参考 */
        .token-card {
            background: var(--white);
            border-radius: 12px;
            border: 1px solid var(--border);
            padding: 30px;
            box-shadow: var(--shadow-sm);
        }

        /* 13. 职业技术培训 & 14. 人工智能培训 */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 25px;
            margin-bottom: 40px;
        }

        .training-card {
            background: var(--white);
            padding: 30px 20px;
            border-radius: 12px;
            border: 1px solid var(--border);
            text-align: center;
            transition: var(--transition);
        }

        .training-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow);
            transform: translateY(-3px);
        }

        .training-icon {
            font-size: 2rem;
            margin-bottom: 15px;
        }

        .training-card h4 {
            font-size: 1.1rem;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .training-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .training-cert-info {
            text-align: center;
            background: var(--primary-light);
            padding: 20px;
            border-radius: 8px;
            color: var(--primary-dark);
            font-weight: 700;
        }

        /* 6条用户评论 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .review-card {
            background: var(--white);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

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

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

        .author-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .author-info h5 {
            font-size: 0.95rem;
            color: var(--text-dark);
        }

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

        /* 15. 帮助中心, 16. FAQ 折叠面板, 17. 自助排查, 18. AI术语百科 */
        .help-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
        }

        .faq-accordion {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .faq-item {
            border: 1px solid var(--border);
            border-radius: 8px;
            background: var(--white);
            overflow: hidden;
        }

        .faq-question {
            padding: 18px 24px;
            background: var(--bg-light);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 700;
            color: var(--text-dark);
            user-select: none;
            transition: var(--transition);
        }

        .faq-question:hover {
            background: var(--primary-light);
        }

        .faq-answer {
            padding: 0 24px;
            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;
            background: var(--white);
        }

        .faq-item.active .faq-answer {
            padding: 18px 24px;
            max-height: 200px;
            border-top: 1px solid var(--border);
        }

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            font-weight: 400;
            color: var(--primary);
            transition: var(--transition);
        }

        .faq-item.active .faq-question::after {
            content: '−';
            transform: rotate(180deg);
        }

        .glossary-box {
            background: var(--white);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border);
        }

        .glossary-box h3 {
            margin-bottom: 20px;
            color: var(--text-dark);
        }

        .glossary-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .glossary-item dt {
            font-weight: 700;
            color: var(--primary-dark);
            margin-bottom: 4px;
        }

        .glossary-item dd {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-left: 0;
        }

        /* 19. 行业资讯 / 知识库 */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .news-card {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 30px;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .news-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            text-decoration: none;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: var(--transition);
        }

        .news-title:hover {
            color: var(--primary);
        }

        .news-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 15px;
            border-top: 1px solid var(--border);
            padding-top: 15px;
            display: flex;
            justify-content: space-between;
        }

        /* 20. 联系我们与智能需求匹配表单 & 21. 加盟代理 */
        .contact-layout {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
        }

        .form-container {
            background: var(--white);
            padding: 40px;
            border-radius: 16px;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border);
        }

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

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--text-dark);
            font-size: 0.95rem;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 1rem;
            background-color: var(--bg-light);
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            background-color: var(--white);
            outline: none;
            box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
        }

        .btn-submit {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            border: none;
            padding: 14px 28px;
            font-size: 1rem;
            font-weight: 700;
            border-radius: 8px;
            cursor: pointer;
            width: 100%;
            transition: var(--transition);
        }

        .btn-submit:hover {
            opacity: 0.95;
            transform: translateY(-1px);
        }

        .contact-info-box {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }

        .info-card {
            background: var(--white);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .info-card h4 {
            font-size: 1.2rem;
            color: var(--text-dark);
            margin-bottom: 15px;
            border-bottom: 2px solid var(--primary-light);
            padding-bottom: 10px;
        }

        .info-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
            font-size: 0.95rem;
        }

        .info-list li strong {
            color: var(--primary-dark);
        }

        .qr-code-wrapper {
            margin-top: 20px;
            text-align: center;
            background: var(--bg-accent);
            padding: 20px;
            border-radius: 8px;
        }

        .qr-code-wrapper img {
            max-width: 140px;
            height: auto;
            border-radius: 6px;
            border: 1px solid var(--border);
        }

        .qr-code-wrapper p {
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 8px;
        }

        /* 友情链接与页脚 */
        footer {
            background-color: #0b1315;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            border-bottom: 1px solid #1e293b;
            padding-bottom: 40px;
            margin-bottom: 30px;
        }

        .footer-about h3 {
            color: var(--white);
            margin-bottom: 15px;
            font-size: 1.25rem;
        }

        .footer-links h4 {
            color: var(--white);
            margin-bottom: 15px;
            font-size: 1rem;
        }

        .footer-links ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: var(--secondary);
        }

        .friend-links {
            margin-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .friend-links a {
            color: #64748b;
            text-decoration: none;
            font-size: 0.8rem;
            background: #1e293b;
            padding: 4px 8px;
            border-radius: 4px;
            transition: var(--transition);
        }

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        /* 侧边悬浮客服 */
        .floating-kefu {
            position: fixed;
            right: 20px;
            bottom: 30px;
            z-index: 999;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            width: 54px;
            height: 54px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            cursor: pointer;
            transition: var(--transition);
        }

        .floating-kefu:hover {
            transform: scale(1.1);
        }

        .floating-kefu-panel {
            position: absolute;
            bottom: 65px;
            right: 0;
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 20px;
            box-shadow: var(--shadow-lg);
            width: 220px;
            display: none;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        .floating-kefu-panel img {
            width: 120px;
            height: 120px;
            margin-bottom: 10px;
        }

        .floating-kefu-panel p {
            color: var(--text-dark);
            font-size: 0.85rem;
            font-weight: 700;
        }

        .floating-kefu:hover .floating-kefu-panel {
            display: flex;
        }

        /* 响应式适配 */
        @media (max-width: 1024px) {
            .about-grid, .prod-layout, .network-layout, .help-grid, .contact-layout {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .solutions-grid, .cases-grid, .reviews-grid {
                grid-template-columns: 1fr 1fr;
            }
            .flow-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: var(--white);
                flex-direction: column;
                padding: 20px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
            }
            .nav-menu.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .hero h1 {
                font-size: 2.25rem;
            }
            .stats-grid, .solutions-grid, .cases-grid, .reviews-grid, .flow-grid {
                grid-template-columns: 1fr;
            }
            .standards-list {
                grid-template-columns: 1fr;
            }
        }