:root {
            --primary: #1e3a8a; /* 深邃蓝 */
            --accent: #ff6b00;  /* 活跃橙 */
            --bg-light: #f8fafc;
            --text-dark: #0f172a;
            --text-muted: #475569;
            --white: #ffffff;
            --border-color: #e2e8f0;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            line-height: 1.6;
        }

        /* 统一容器 */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 15px;
            color: var(--primary);
            font-weight: 800;
            position: relative;
        }

        .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: var(--accent);
            margin: 10px auto 0;
            border-radius: 2px;
        }

        .section-desc {
            text-align: center;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto 50px;
            font-size: 1.1rem;
        }

        /* 导航栏 */
        header {
            background-color: var(--white);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .nav-wrapper {
            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;
        }

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

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

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

        .nav-menu .ai-page-home-link {
            color: var(--white);
            background-color: var(--primary);
            padding: 6px 16px;
            border-radius: 20px;
            transition: var(--transition);
        }

        .nav-menu .ai-page-home-link:hover {
            background-color: var(--accent);
            color: var(--white);
        }

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

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

        /* Hero首屏 - 严禁包含图片 */
        .hero {
            background: linear-gradient(135deg, #1e3b8a22 0%, #ff6c0015 100%), var(--white);
            padding: 100px 0;
            text-align: center;
            border-bottom: 2px solid var(--border-color);
        }

        .hero-content {
            max-width: 900px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 3rem;
            line-height: 1.2;
            color: var(--primary);
            margin-bottom: 20px;
            font-weight: 900;
        }

        .hero-subtitle {
            font-size: 1.3rem;
            color: var(--text-muted);
            margin-bottom: 40px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-btn-group {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 60px;
        }

        .btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 30px;
            font-weight: bold;
            text-decoration: none;
            transition: var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
            font-size: 1.05rem;
        }

        .btn-primary {
            background-color: var(--accent);
            color: var(--white);
            box-shadow: 0 4px 15px rgba(255, 107, 0, 0.3);
        }

        .btn-primary:hover {
            background-color: var(--primary);
            color: var(--white);
            box-shadow: 0 4px 15px rgba(30, 58, 138, 0.3);
            transform: translateY(-2px);
        }

        .btn-secondary {
            background-color: var(--white);
            color: var(--primary);
            border-color: var(--primary);
        }

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

        /* 首屏数据指标卡片 */
        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 40px;
        }

        .stat-card {
            background: var(--white);
            padding: 20px;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
            border: 1px solid var(--border-color);
            border-top: 4px solid var(--accent);
        }

        .stat-card h3 {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 5px;
        }

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

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

        .about-text h3 {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .about-features {
            margin-top: 30px;
        }

        .about-feature-item {
            display: flex;
            align-items: flex-start;
            gap: 15px;
            margin-bottom: 20px;
        }

        .about-feature-icon {
            background-color: var(--accent);
            color: var(--white);
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            font-weight: bold;
            flex-shrink: 0;
        }

        /* 服务体系与场景 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .service-card {
            background-color: var(--white);
            padding: 30px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(30, 58, 138, 0.08);
            border-color: var(--primary);
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 6px;
            height: 100%;
            background-color: var(--accent);
        }

        .service-card h3 {
            font-size: 1.4rem;
            color: var(--primary);
            margin-bottom: 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

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

        /* 标签云 - 聚合平台展示 */
        .platform-cloud {
            margin-top: 50px;
            background: var(--white);
            padding: 30px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            text-align: center;
        }

        .platform-cloud h4 {
            color: var(--primary);
            margin-bottom: 20px;
            font-size: 1.2rem;
        }

        .tag-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
        }

        .tag-item {
            padding: 6px 14px;
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            font-size: 0.85rem;
            color: var(--text-dark);
            transition: var(--transition);
        }

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

        /* 制作流程 & 标准服务 */
        .workflow-timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .step-card {
            background-color: var(--white);
            padding: 25px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
        }

        .step-num {
            width: 40px;
            height: 40px;
            background-color: var(--accent);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px;
            font-weight: bold;
        }

        .step-card h3 {
            font-size: 1.1rem;
            color: var(--primary);
            margin-bottom: 10px;
        }

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

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

        .solution-item {
            background-color: var(--white);
            padding: 30px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .solution-item:hover {
            border-color: var(--accent);
            box-shadow: 0 8px 20px rgba(255, 107, 0, 0.05);
        }

        .solution-item h3 {
            color: var(--primary);
            margin-bottom: 15px;
            border-bottom: 2px solid var(--bg-light);
            padding-bottom: 10px;
        }

        /* 全国服务网络 & 技术标准 */
        .grid-split {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .network-box, .standards-box {
            background-color: var(--white);
            padding: 35px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
        }

        .standards-box ul {
            list-style: none;
        }

        .standards-box li {
            margin-bottom: 15px;
            padding-left: 20px;
            position: relative;
        }

        .standards-box li::before {
            content: '✓';
            color: var(--accent);
            position: absolute;
            left: 0;
            font-weight: bold;
        }

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

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

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        }

        .case-img-wrap {
            width: 100%;
            height: 200px;
            background-color: var(--bg-light);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

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

        .case-info {
            padding: 20px;
        }

        .case-info h3 {
            font-size: 1.15rem;
            color: var(--primary);
            margin-bottom: 10px;
        }

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

        /* 对比评测 */
        .comparison-area {
            background-color: var(--white);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 20px rgba(30, 58, 138, 0.03);
        }

        .comp-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 20px;
        }

        .comp-score {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .score-num {
            font-size: 3rem;
            font-weight: 900;
            color: var(--accent);
        }

        .stars {
            color: #fbbf24;
            font-size: 1.5rem;
        }

        .comparison-table-wrapper {
            overflow-x: auto;
        }

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

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

        .comparison-table th {
            background-color: var(--bg-light);
            color: var(--primary);
            font-weight: bold;
        }

        .comparison-table tr:hover {
            background-color: #f8fafc;
        }

        .highlight-col {
            background-color: #eff6ff;
            font-weight: bold;
            color: var(--primary);
        }

        /* Token比价与培训 */
        .token-pricing-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .price-card, .training-card {
            background-color: var(--white);
            padding: 35px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
        }

        .price-list {
            margin-top: 20px;
        }

        .price-item {
            display: flex;
            justify-content: space-between;
            padding: 12px 0;
            border-bottom: 1px dashed var(--border-color);
        }

        .price-item span:first-child {
            font-weight: 500;
        }

        .price-item span:last-child {
            color: var(--accent);
            font-weight: bold;
        }

        .training-list {
            margin-top: 20px;
        }

        .training-item {
            padding: 15px;
            background-color: var(--bg-light);
            border-radius: 8px;
            margin-bottom: 12px;
            border-left: 4px solid var(--primary);
        }

        .training-item h4 {
            color: var(--primary);
            font-size: 1rem;
            margin-bottom: 5px;
        }

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

        /* 帮助中心 & 自助排查 & 百科 */
        .help-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .help-box {
            background-color: var(--white);
            padding: 30px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
        }

        .help-box h3 {
            color: var(--primary);
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .help-list {
            list-style: none;
        }

        .help-list li {
            margin-bottom: 12px;
        }

        .help-list a {
            text-decoration: none;
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: var(--transition);
        }

        .help-list a:hover {
            color: var(--accent);
            padding-left: 5px;
        }

        /* 常见问题 FAQ */
        .faq-list {
            max-width: 900px;
            margin: 0 auto;
        }

        .faq-item {
            background-color: var(--white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-question {
            padding: 20px;
            font-weight: 600;
            color: var(--primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-question::after {
            content: '+';
            font-size: 1.2rem;
            color: var(--accent);
            transition: var(--transition);
        }

        .faq-item.active .faq-question::after {
            content: '−';
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
            background-color: var(--bg-light);
        }

        .faq-answer-inner {
            padding: 20px;
            font-size: 0.95rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border-color);
        }

        .faq-item.active .faq-answer {
            max-height: 1000px;
            transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
        }

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

        .review-card {
            background-color: var(--white);
            padding: 30px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            position: relative;
        }

        .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: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--primary);
            color: var(--white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 0.9rem;
        }

        .author-info h4 {
            font-size: 0.95rem;
            color: var(--primary);
        }

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

        /* 智能需求匹配与表单 */
        .contact-section-wrapper {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
        }

        .form-card {
            background-color: var(--white);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        .form-group-full {
            grid-column: span 2;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: var(--text-dark);
            font-size: 0.9rem;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            background-color: var(--bg-light);
            color: var(--text-dark);
            font-family: inherit;
            font-size: 0.95rem;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--accent);
            background-color: var(--white);
            box-shadow: 0 0 0 3px rgba(255, 107, 0, 0.1);
        }

        textarea.form-control {
            resize: vertical;
            min-height: 100px;
        }

        .form-card button {
            width: 100%;
            border: none;
            padding: 15px;
            font-size: 1rem;
        }

        .contact-info-card {
            background-color: var(--white);
            padding: 40px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .info-block {
            margin-bottom: 25px;
        }

        .info-block h3 {
            color: var(--primary);
            font-size: 1.15rem;
            margin-bottom: 10px;
        }

        .info-block p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 5px;
        }

        .qr-wrap {
            display: flex;
            gap: 15px;
            align-items: center;
            margin-top: 15px;
        }

        .qr-wrap img {
            width: 100px;
            height: 100px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 5px;
        }

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

        /* 知识库/资讯文章 */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .article-card {
            background-color: var(--white);
            padding: 20px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .article-card:hover {
            border-color: var(--accent);
            transform: translateY(-2px);
        }

        .article-card a {
            text-decoration: none;
            color: var(--primary);
            font-weight: bold;
            font-size: 1rem;
            display: block;
            margin-bottom: 10px;
        }

        .article-card a:hover {
            color: var(--accent);
        }

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

        /* 页脚 */
        footer {
            background-color: #0f172a; /* 强制指定深色背景 */
            color: #94a3b8;
            padding: 60px 0 20px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
            border-bottom: 1px solid #334155;
            padding-bottom: 40px;
        }

        .footer-logo img {
            height: 35px;
            width: auto;
            margin-bottom: 15px;
        }

        .footer-col h4 {
            color: var(--white);
            font-size: 1.1rem;
            margin-bottom: 20px;
        }

        .footer-links {
            list-style: none;
        }

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

        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--transition);
            font-size: 0.9rem;
        }

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

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

        .friend-links a {
            color: #94a3b8;
            text-decoration: none;
            font-size: 0.85rem;
            background-color: #1e293b;
            padding: 5px 10px;
            border-radius: 4px;
            transition: var(--transition);
        }

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
        }

        .footer-bottom p {
            margin: 0;
        }

        /* 浮动客服 */
        .sticky-kf {
            position: fixed;
            right: 20px;
            bottom: 40px;
            z-index: 999;
            background-color: var(--accent);
            color: var(--white);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 4px 10px rgba(0,0,0,0.15);
            transition: var(--transition);
        }

        .sticky-kf:hover {
            transform: scale(1.1);
            background-color: var(--primary);
        }

        .kf-box {
            position: absolute;
            bottom: 60px;
            right: 0;
            background-color: var(--white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 20px;
            width: 220px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            display: none;
            text-align: center;
            color: var(--text-dark);
        }

        .kf-box img {
            width: 120px;
            height: 120px;
            margin-bottom: 10px;
        }

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

        /* 响应式媒体查询 */
        @media (max-width: 992px) {
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-content {
                grid-template-columns: 1fr;
            }
            .workflow-timeline {
                grid-template-columns: repeat(2, 1fr);
            }
            .solutions-grid {
                grid-template-columns: 1fr;
            }
            .grid-split {
                grid-template-columns: 1fr;
            }
            .cases-grid {
                grid-template-columns: 1fr;
            }
            .token-pricing-wrapper {
                grid-template-columns: 1fr;
            }
            .help-grid {
                grid-template-columns: 1fr;
            }
            .reviews-grid {
                grid-template-columns: 1fr;
            }
            .contact-section-wrapper {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--white);
                padding: 20px;
                box-shadow: 0 4px 6px rgba(0,0,0,0.05);
                border-top: 1px solid var(--border-color);
            }
            .nav-menu.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero-stats {
                grid-template-columns: 1fr;
            }
            .workflow-timeline {
                grid-template-columns: 1fr;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group-full {
                grid-column: span 1;
            }
        }