:root {
            --primary: #2563eb;
            --primary-hover: #1d4ed8;
            --secondary: #10b981;
            --accent: #f59e0b;
            --dark: #0f172a;
            --light: #f8fafc;
            --white: #ffffff;
            --gray-100: #f1f5f9;
            --gray-200: #e2e8f0;
            --gray-600: #475569;
            --gray-700: #334155;
            --gradient: linear-gradient(135deg, #2563eb 0%, #10b981 100%);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            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(--gray-700);
            background-color: var(--light);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* 顶部导航 */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            box-shadow: 0 1px 10px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

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

        .brand-name {
            font-size: 1.25rem;
            font-weight: 800;
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .nav-menu {
            display: flex;
            gap: 1.5rem;
            list-style: none;
            align-items: center;
        }

        .nav-menu a {
            text-decoration: none;
            color: var(--gray-700);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
        }

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

        .nav-btn {
            background: var(--primary);
            color: var(--white) !important;
            padding: 0.5rem 1.2rem;
            border-radius: 99px;
            font-weight: 600;
            transition: var(--transition);
        }

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

        /* 移动端菜单按钮 */
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 6px;
            cursor: pointer;
            border: none;
            background: transparent;
        }

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

        /* Hero首屏 - 严格限制：无任何图片 */
        .hero {
            position: relative;
            padding: 180px 0 100px 0;
            background: radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.05) 0%, rgba(16, 185, 129, 0.05) 90%);
            text-align: center;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(37,99,235,0.03) 0%, transparent 60%);
            pointer-events: none;
            animation: rotateBg 20s linear infinite;
        }

        @keyframes rotateBg {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .hero h1 {
            font-size: 3rem;
            line-height: 1.2;
            color: var(--dark);
            margin-bottom: 1.5rem;
            font-weight: 800;
            position: relative;
        }

        .hero h1 span {
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 1.25rem;
            color: var(--gray-600);
            max-width: 800px;
            margin: 0 auto 2.5rem auto;
            position: relative;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            position: relative;
            z-index: 5;
        }

        .btn-main {
            display: inline-block;
            background: var(--primary);
            color: var(--white);
            padding: 1rem 2.5rem;
            border-radius: 99px;
            text-decoration: none;
            font-size: 1.1rem;
            font-weight: 700;
            box-shadow: 0 10px 20px rgba(37, 99, 235, 0.2);
            transition: var(--transition);
        }

        .btn-main:hover {
            background: var(--primary-hover);
            transform: translateY(-3px);
            box-shadow: 0 15px 25px rgba(37, 99, 235, 0.3);
        }

        .btn-sub {
            display: inline-block;
            background: var(--white);
            color: var(--primary);
            border: 2px solid var(--primary);
            padding: 1rem 2.5rem;
            border-radius: 99px;
            text-decoration: none;
            font-size: 1.1rem;
            font-weight: 700;
            transition: var(--transition);
        }

        .btn-sub:hover {
            background: var(--gray-100);
            transform: translateY(-3px);
        }

        /* 板块公用标题样式 */
        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .section-header h2 {
            font-size: 2.25rem;
            color: var(--dark);
            margin-bottom: 1rem;
            font-weight: 800;
            position: relative;
            display: inline-block;
        }

        .section-header h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: var(--gradient);
            border-radius: 2px;
        }

        .section-header p {
            color: var(--gray-600);
            font-size: 1.1rem;
        }

        /* 通用区块设置 */
        section {
            padding: 100px 0;
            position: relative;
        }

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

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

        /* 2. 关于我们 / 平台介绍 */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }

        .about-content h3 {
            font-size: 1.75rem;
            color: var(--dark);
            margin-bottom: 1.5rem;
        }

        .about-content p {
            color: var(--gray-600);
            margin-bottom: 1.5rem;
            font-size: 1.05rem;
        }

        .about-features {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }

        .about-features li {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 600;
            color: var(--gray-700);
        }

        .about-features li::before {
            content: '✓';
            color: var(--secondary);
            font-weight: bold;
        }

        /* 数据指标卡片 */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            margin-top: 3rem;
        }

        .metric-card {
            background: var(--white);
            border-radius: 16px;
            padding: 2rem;
            text-align: center;
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
            border: 1px solid var(--gray-200);
            transition: var(--transition);
        }

        .metric-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .metric-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 0.5rem;
        }

        .metric-label {
            color: var(--gray-600);
            font-size: 0.95rem;
            font-weight: 500;
        }

        /* 3. 全平台 AIGC 服务 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .service-card {
            background: var(--white);
            border: 1px solid var(--gray-200);
            border-radius: 16px;
            padding: 2.5rem;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.05);
            border-color: var(--primary);
        }

        .service-icon {
            width: 60px;
            height: 60px;
            background: rgba(37, 99, 235, 0.1);
            color: var(--primary);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .service-card h3 {
            font-size: 1.3rem;
            margin-bottom: 1rem;
            color: var(--dark);
        }

        .service-card p {
            color: var(--gray-600);
            font-size: 0.95rem;
        }

        /* 模型标签墙 */
        .model-tags {
            margin-top: 4rem;
            text-align: center;
            background: var(--white);
            padding: 3rem;
            border-radius: 24px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.02);
            border: 1px solid var(--gray-200);
        }

        .model-tags h4 {
            margin-bottom: 1.5rem;
            font-size: 1.25rem;
            color: var(--dark);
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.75rem;
        }

        .tag {
            background: var(--gray-100);
            color: var(--gray-700);
            padding: 0.5rem 1.2rem;
            border-radius: 99px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: var(--transition);
        }

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

        /* 4. 一站式 AIGC 制作 & 解决方案 */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 2.5rem;
        }

        .solution-card {
            background: var(--white);
            border-radius: 20px;
            padding: 3rem;
            box-shadow: 0 5px 25px rgba(0,0,0,0.02);
            border: 1px solid var(--gray-200);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .solution-info h3 {
            font-size: 1.5rem;
            color: var(--dark);
            margin-bottom: 1rem;
        }

        .solution-info p {
            color: var(--gray-600);
            margin-bottom: 2rem;
        }

        .solution-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }

        .solution-list li {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.95rem;
        }

        .solution-list li::before {
            content: '●';
            color: var(--primary);
            font-size: 0.8rem;
        }

        /* 6. 全国服务网络 */
        .network-map {
            background: var(--white);
            border-radius: 24px;
            padding: 3.5rem;
            text-align: center;
            box-shadow: 0 10px 40px rgba(0,0,0,0.02);
            border: 1px solid var(--gray-200);
        }

        .network-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            margin-top: 3rem;
        }

        .network-item h4 {
            font-size: 1.15rem;
            color: var(--dark);
            margin-bottom: 0.5rem;
        }

        .network-item p {
            color: var(--gray-600);
            font-size: 0.9rem;
        }

        /* 7. 标准化流程步骤 */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 1.5rem;
            position: relative;
        }

        .step-card {
            background: var(--white);
            border-radius: 16px;
            padding: 2rem;
            text-align: center;
            position: relative;
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
            border: 1px solid var(--gray-200);
            z-index: 2;
        }

        .step-num {
            width: 45px;
            height: 45px;
            background: var(--gradient);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            margin: 0 auto 1.5rem auto;
            font-size: 1.1rem;
        }

        .step-card h3 {
            font-size: 1.1rem;
            margin-bottom: 0.75rem;
            color: var(--dark);
        }

        .step-card p {
            font-size: 0.85rem;
            color: var(--gray-600);
            line-height: 1.5;
        }

        /* 8. 技术标准 / 证书 & 培训 */
        .training-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }

        .cert-list {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }

        .cert-card {
            background: var(--white);
            border-radius: 16px;
            padding: 1.5rem;
            box-shadow: 0 4px 15px rgba(0,0,0,0.02);
            border-left: 5px solid var(--secondary);
            border-top: 1px solid var(--gray-200);
            border-right: 1px solid var(--gray-200);
            border-bottom: 1px solid var(--gray-200);
        }

        .cert-card h4 {
            font-size: 1.15rem;
            color: var(--dark);
            margin-bottom: 0.25rem;
        }

        .cert-card p {
            color: var(--gray-600);
            font-size: 0.9rem;
        }

        /* 9. 客户案例中心 */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .case-card {
            background: var(--white);
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid var(--gray-200);
            box-shadow: 0 10px 30px rgba(0,0,0,0.02);
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.08);
        }

        .case-img-wrapper {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--gray-100);
        }

        .case-img-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .case-card:hover .case-img-wrapper img {
            transform: scale(1.05);
        }

        .case-info {
            padding: 2rem;
        }

        .case-tag {
            display: inline-block;
            background: rgba(37,99,235,0.08);
            color: var(--primary);
            padding: 0.25rem 0.75rem;
            border-radius: 99px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }

        .case-info h3 {
            font-size: 1.25rem;
            color: var(--dark);
            margin-bottom: 0.75rem;
        }

        .case-info p {
            color: var(--gray-600);
            font-size: 0.9rem;
        }

        /* 10. 对比评测 */
        .review-card {
            background: var(--white);
            border-radius: 24px;
            padding: 4rem;
            box-shadow: 0 10px 40px rgba(0,0,0,0.02);
            border: 1px solid var(--gray-200);
        }

        .review-score-area {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 2rem;
            margin-bottom: 3rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid var(--gray-200);
        }

        .score-box {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }

        .score-num {
            font-size: 4rem;
            font-weight: 900;
            color: var(--accent);
            line-height: 1;
        }

        .score-detail h4 {
            font-size: 1.25rem;
            color: var(--dark);
            margin-bottom: 0.25rem;
        }

        .score-stars {
            color: var(--accent);
            font-size: 1.2rem;
        }

        .review-btn-wrap {
            text-align: right;
        }

        /* 对比表格 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border-radius: 12px;
            border: 1px solid var(--gray-200);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 700px;
        }

        .comparison-table th, .comparison-table td {
            padding: 1.2rem;
            border-bottom: 1px solid var(--gray-200);
            font-size: 0.95rem;
        }

        .comparison-table th {
            background-color: var(--gray-100);
            color: var(--dark);
            font-weight: 700;
        }

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

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

        /* 12. Token 比价参考 */
        .price-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .price-card {
            background: var(--white);
            border-radius: 20px;
            padding: 3rem;
            border: 1px solid var(--gray-200);
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
            text-align: center;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .price-card.popular {
            border-color: var(--primary);
            box-shadow: 0 10px 30px rgba(37,99,235,0.1);
        }

        .badge-popular {
            position: absolute;
            top: 15px;
            right: -35px;
            background: var(--primary);
            color: var(--white);
            padding: 0.25rem 2rem;
            transform: rotate(45deg);
            font-size: 0.75rem;
            font-weight: bold;
        }

        .price-card h3 {
            font-size: 1.5rem;
            margin-bottom: 1rem;
            color: var(--dark);
        }

        .price-val {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 1.5rem;
        }

        .price-val span {
            font-size: 1rem;
            color: var(--gray-600);
            font-weight: normal;
        }

        .price-features {
            list-style: none;
            margin-bottom: 2.5rem;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            text-align: left;
        }

        .price-features li {
            font-size: 0.95rem;
            color: var(--gray-600);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .price-features li::before {
            content: '✓';
            color: var(--secondary);
            font-weight: bold;
        }

        /* 11. 智能需求匹配与联系我们 (表单) */
        .contact-section {
            background-color: var(--white);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 4rem;
        }

        .form-card {
            background: var(--light);
            border-radius: 24px;
            padding: 3.5rem;
            border: 1px solid var(--gray-200);
            box-shadow: 0 4px 20px rgba(0,0,0,0.01);
        }

        .form-card h3 {
            font-size: 1.75rem;
            color: var(--dark);
            margin-bottom: 2rem;
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--gray-700);
        }

        .form-control {
            width: 100%;
            padding: 0.85rem 1.2rem;
            border-radius: 8px;
            border: 1px solid var(--gray-200);
            background-color: var(--white);
            color: var(--dark);
            font-size: 1rem;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(37,99,235,0.1);
        }

        .btn-submit {
            width: 100%;
            background: var(--gradient);
            color: var(--white);
            border: none;
            padding: 1rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-submit:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(37,99,235,0.15);
        }

        .contact-info-area {
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .contact-details {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }

        .contact-item {
            display: flex;
            gap: 1rem;
            align-items: flex-start;
        }

        .contact-item-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            background: rgba(37, 99, 235, 0.08);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            flex-shrink: 0;
        }

        .contact-item-text h4 {
            font-size: 1.1rem;
            color: var(--dark);
            margin-bottom: 0.25rem;
        }

        .contact-item-text p, .contact-item-text a {
            color: var(--gray-600);
            font-size: 0.95rem;
            text-decoration: none;
        }

        .contact-item-text a:hover {
            color: var(--primary);
        }

        .qr-codes {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
            margin-top: 3rem;
            background: var(--light);
            padding: 2rem;
            border-radius: 20px;
            border: 1px solid var(--gray-200);
            text-align: center;
        }

        .qr-box {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
        }

        .qr-box img {
            width: 140px;
            height: 140px;
            border-radius: 8px;
            border: 4px solid var(--white);
            box-shadow: 0 4px 15px rgba(0,0,0,0.05);
        }

        .qr-box p {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--gray-700);
        }

        /* 11. 用户评论 */
        .comments-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .comment-card {
            background: var(--white);
            border-radius: 20px;
            padding: 2.5rem;
            border: 1px solid var(--gray-200);
            box-shadow: 0 4px 20px rgba(0,0,0,0.01);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: var(--transition);
        }

        .comment-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
        }

        .comment-text {
            color: var(--gray-600);
            font-size: 0.95rem;
            margin-bottom: 2rem;
            line-height: 1.7;
            position: relative;
        }

        .comment-text::before {
            content: '“';
            font-size: 3rem;
            color: rgba(37,99,235,0.08);
            position: absolute;
            top: -20px;
            left: -10px;
            font-family: serif;
        }

        .comment-user {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .user-avatar {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--gradient);
            color: var(--white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .user-meta h4 {
            font-size: 1rem;
            color: var(--dark);
        }

        .user-meta p {
            color: var(--gray-600);
            font-size: 0.8rem;
        }

        /* 16. FAQ & 自助排查 & 百科 */
        .faq-section {
            background-color: var(--light);
        }

        .faq-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 4rem;
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .faq-item {
            background: var(--white);
            border-radius: 12px;
            border: 1px solid var(--gray-200);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-quest {
            width: 100%;
            padding: 1.25rem 1.5rem;
            text-align: left;
            background: none;
            border: none;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
        }

        .faq-quest::after {
            content: '+';
            font-size: 1.5rem;
            color: var(--gray-600);
            transition: var(--transition);
        }

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

        .faq-ans {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background: var(--light);
        }

        .faq-ans-inner {
            padding: 1.5rem;
            color: var(--gray-600);
            font-size: 0.95rem;
            border-top: 1px solid var(--gray-200);
        }

        .side-panels {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }

        .side-card {
            background: var(--white);
            border-radius: 20px;
            padding: 2.5rem;
            border: 1px solid var(--gray-200);
        }

        .side-card h3 {
            font-size: 1.25rem;
            color: var(--dark);
            margin-bottom: 1.5rem;
            border-bottom: 2px solid var(--gray-100);
            padding-bottom: 0.75rem;
        }

        .troubleshoot-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .troubleshoot-list li {
            position: relative;
            padding-left: 1.5rem;
            font-size: 0.95rem;
        }

        .troubleshoot-list li::before {
            content: '•';
            color: var(--primary);
            position: absolute;
            left: 0;
            font-size: 1.2rem;
        }

        .wiki-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }

        .wiki-tag {
            background: var(--gray-100);
            color: var(--gray-700);
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            font-size: 0.85rem;
            transition: var(--transition);
        }

        .wiki-tag:hover {
            background: var(--primary);
            color: var(--white);
        }

        /* 19. 知识库 / 文章列表 */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .article-card {
            background: var(--white);
            border-radius: 16px;
            padding: 2rem;
            border: 1px solid var(--gray-200);
            box-shadow: 0 4px 20px rgba(0,0,0,0.01);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            transition: var(--transition);
        }

        .article-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
        }

        .article-card h3 {
            font-size: 1.15rem;
            color: var(--dark);
            margin-bottom: 1rem;
            line-height: 1.4;
        }

        .article-card p {
            color: var(--gray-600);
            font-size: 0.85rem;
            margin-bottom: 1.5rem;
        }

        .article-link {
            color: var(--primary);
            text-decoration: none;
            font-weight: 700;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            transition: var(--transition);
        }

        .article-link:hover {
            gap: 0.5rem;
        }

        /* 页脚 */
        footer {
            background-color: var(--dark);
            color: #94a3b8;
            padding: 80px 0 30px 0;
            font-size: 0.95rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1.5fr;
            gap: 4rem;
            margin-bottom: 4rem;
        }

        .footer-brand h3 {
            color: var(--white);
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }

        .footer-brand p {
            margin-bottom: 1.5rem;
            line-height: 1.7;
        }

        .footer-links h4 {
            color: var(--white);
            font-size: 1.1rem;
            margin-bottom: 1.5rem;
        }

        .footer-links ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

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

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

        .footer-contact h4 {
            color: var(--white);
            font-size: 1.1rem;
            margin-bottom: 1.5rem;
        }

        .footer-contact p {
            margin-bottom: 0.75rem;
        }

        .friend-links {
            border-top: 1px solid #334155;
            padding-top: 2rem;
            margin-bottom: 2rem;
        }

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

        .friend-links-list {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem 1.5rem;
        }

        .friend-links-list a {
            color: #64748b;
            text-decoration: none;
            font-size: 0.85rem;
            transition: var(--transition);
        }

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

        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            font-size: 0.85rem;
        }

        .footer-bottom p {
            color: #64748b;
        }

        .ai-page-home-link {
            color: var(--primary) !important;
            font-weight: 700;
        }

        /* 浮动客服及返回顶部 */
        .floating-widget {
            position: fixed;
            bottom: 30px;
            right: 30px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            z-index: 999;
        }

        .widget-item {
            width: 50px;
            height: 50px;
            background: var(--white);
            border-radius: 50%;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            position: relative;
            transition: var(--transition);
            border: 1px solid var(--gray-200);
            color: var(--gray-700);
            text-decoration: none;
        }

        .widget-item:hover {
            background: var(--primary);
            color: var(--white);
            transform: translateY(-3px);
        }

        .widget-item .tooltip {
            position: absolute;
            right: 60px;
            background: var(--dark);
            color: var(--white);
            padding: 0.5rem 1rem;
            border-radius: 6px;
            font-size: 0.85rem;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transition: var(--transition);
        }

        .widget-item:hover .tooltip {
            opacity: 1;
        }

        .widget-item .qr-popup {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: var(--white);
            padding: 1rem;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            display: none;
            text-align: center;
            z-index: 10;
        }

        .widget-item:hover .qr-popup {
            display: block;
        }

        .widget-item .qr-popup img {
            width: 120px;
            height: 120px;
        }

        .widget-item .qr-popup p {
            color: var(--dark);
            font-size: 0.75rem;
            margin-top: 0.5rem;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .hero h1 { font-size: 2.5rem; }
            .about-grid, .solutions-grid, .training-grid, .contact-grid, .faq-grid {
                grid-template-columns: 1fr;
                gap: 3rem;
            }
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .services-grid, .cases-grid, .price-grid, .comments-grid, .articles-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-container {
                grid-template-columns: repeat(3, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2.5rem;
            }
        }

        @media (max-width: 768px) {
            .menu-toggle { display: flex; }
            .nav-menu {
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: var(--white);
                flex-direction: column;
                padding: 2rem;
                border-top: 1px solid var(--gray-200);
                box-shadow: 0 10px 20px rgba(0,0,0,0.05);
                display: none;
                gap: 1.5rem;
            }
            .nav-menu.active {
                display: flex;
            }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1.1rem; }
            .hero-btns {
                flex-direction: column;
                align-items: center;
                gap: 1rem;
            }
            .btn-main, .btn-sub {
                width: 100%;
                max-width: 300px;
            }
            .metrics-grid, .services-grid, .cases-grid, .price-grid, .comments-grid, .articles-grid, .steps-container, .network-grid {
                grid-template-columns: 1fr;
            }
            .review-score-area {
                flex-direction: column;
                align-items: flex-start;
            }
        }