/* CSS reset & variables */
        :root {
            --primary: #6366f1;
            --primary-grad: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
            --accent: #f97316;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --text-dark: #0f172a;
            --text-muted: #475569;
            --border: #e2e8f0;
            --shadow-sm: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1);
            --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
            --radius: 12px;
            --container-width: 1200px;
        }

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

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.3s;
        }

        a:hover {
            color: #4f46e5;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部导航 */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border);
            transition: all 0.3s;
        }

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

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

        .ai-page-logo {
            height: 40px;
            object-fit: contain;
        }

        .brand-name {
            font-size: 20px;
            font-weight: 800;
            background: var(--primary-grad);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

        .nav-menu a {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-muted);
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.2s;
        }

        .nav-menu a:hover {
            color: var(--primary);
            background-color: rgba(99, 102, 241, 0.05);
        }

        .nav-btn {
            background: var(--primary-grad);
            color: #fff !important;
            padding: 8px 18px !important;
            border-radius: 20px !important;
            box-shadow: 0 4px 10px rgba(99, 102, 241, 0.2);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            cursor: pointer;
            color: var(--text-dark);
        }

        /* Hero 首屏 (无图设计，活力亮彩渐变) */
        .hero-section {
            background: radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.1) 0%, rgba(168, 85, 247, 0.15) 30%, rgba(99, 102, 241, 0.08) 70%, var(--bg-light) 100%);
            padding: 100px 0 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -10%;
            left: -10%;
            width: 40%;
            height: 60%;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
            z-index: 1;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.9);
            border: 1px solid var(--border);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 24px;
            box-shadow: var(--shadow-sm);
            z-index: 2;
            position: relative;
        }

        .hero-badge span {
            color: var(--accent);
        }

        .hero-title {
            font-size: 44px;
            line-height: 1.25;
            font-weight: 800;
            color: var(--text-dark);
            max-width: 900px;
            margin: 0 auto 24px auto;
            letter-spacing: -0.5px;
            z-index: 2;
            position: relative;
        }

        .hero-title span {
            background: var(--primary-grad);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-subtitle {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto 40px auto;
            z-index: 2;
            position: relative;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            z-index: 2;
            position: relative;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 600;
            padding: 14px 28px;
            border-radius: 30px;
            transition: all 0.3s;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--primary-grad);
            color: #fff;
            box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
            color: #fff;
        }

        .btn-secondary {
            background: #fff;
            color: var(--text-dark);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .btn-secondary:hover {
            transform: translateY(-2px);
            background: var(--bg-light);
            border-color: #cbd5e1;
        }

        /* 统一卡片样式 */
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-tag {
            font-size: 13px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--primary);
            margin-bottom: 12px;
            display: block;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-dark);
        }

        .section-desc {
            color: var(--text-muted);
            max-width: 600px;
            margin: 12px auto 0 auto;
            font-size: 16px;
        }

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

        section:nth-of-type(even) {
            background-color: var(--bg-light);
        }

        /* 数据指标卡片 */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .metric-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            padding: 30px 24px;
            border-radius: var(--radius);
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s;
        }

        .metric-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(99, 102, 241, 0.2);
        }

        .metric-num {
            font-size: 38px;
            font-weight: 800;
            background: var(--primary-grad);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 8px;
        }

        .metric-label {
            font-size: 15px;
            color: var(--text-dark);
            font-weight: 600;
            margin-bottom: 4px;
        }

        .metric-desc {
            font-size: 13px;
            color: var(--text-muted);
        }

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

        .service-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 40px 30px;
            transition: all 0.3s;
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--primary-grad);
            opacity: 0;
            transition: opacity 0.3s;
        }

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

        .service-card:hover::before {
            opacity: 1;
        }

        .service-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            background: rgba(99, 102, 241, 0.1);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            margin-bottom: 24px;
        }

        .service-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-dark);
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 14px;
            margin-bottom: 20px;
            flex-grow: 1;
        }

        .service-tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .service-tag {
            font-size: 11px;
            background: var(--bg-light);
            color: var(--text-muted);
            padding: 4px 10px;
            border-radius: 20px;
        }

        /* 流程步骤 */
        .step-timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            position: relative;
        }

        .step-timeline::after {
            content: '';
            position: absolute;
            top: 40px;
            left: 50px;
            right: 50px;
            height: 2px;
            background: var(--border);
            z-index: 1;
        }

        .step-node {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .step-num {
            width: 60px;
            height: 60px;
            background: var(--bg-white);
            border: 3px solid var(--primary);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            margin: 0 auto 20px auto;
            box-shadow: var(--shadow-md);
            transition: all 0.3s;
        }

        .step-node:hover .step-num {
            background: var(--primary-grad);
            color: #fff;
            border-color: transparent;
            transform: scale(1.1);
        }

        .step-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .step-desc {
            font-size: 13px;
            color: var(--text-muted);
            padding: 0 10px;
        }

        /* 对比表格 */
        .table-responsive {
            overflow-x: auto;
            margin-top: 30px;
            box-shadow: var(--shadow-md);
            border-radius: var(--radius);
            background: #fff;
        }

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

        .comparison-table th, .comparison-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border);
        }

        .comparison-table th {
            background-color: #f1f5f9;
            font-weight: 700;
            color: var(--text-dark);
        }

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

        .comparison-table td.highlight {
            background-color: rgba(99, 102, 241, 0.03);
            font-weight: 600;
            color: var(--primary);
        }

        .badge-star {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: #fef3c7;
            color: #d97706;
            padding: 4px 10px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 700;
        }

        /* FAQ 手风琴 */
        .faq-grid {
            display: flex;
            flex-direction: column;
            gap: 16px;
            max-width: 850px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.3s;
        }

        .faq-header {
            padding: 20px 24px;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-size: 16px;
            font-weight: 700;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .faq-icon-arrow {
            transition: transform 0.3s;
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            padding: 0 24px;
        }

        .faq-content p {
            padding-bottom: 20px;
            color: var(--text-muted);
            font-size: 14px;
        }

        .faq-item.active {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
        }

        .faq-item.active .faq-icon-arrow {
            transform: rotate(180deg);
        }

        .faq-item.active .faq-content {
            max-height: 200px;
        }

        /* 客户评论 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

        .review-meta {
            margin-top: 20px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .review-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-grad);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
        }

        .review-author h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-dark);
        }

        .review-author span {
            font-size: 12px;
            color: var(--text-muted);
        }

        .review-text {
            font-size: 14px;
            color: var(--text-muted);
            font-style: italic;
        }

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

        .case-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s;
        }

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

        .case-img-wrapper {
            position: relative;
            background: #e2e8f0;
            aspect-ratio: 16 / 10;
            overflow: hidden;
        }

        .case-img-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

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

        .case-info {
            padding: 24px;
        }

        .case-tag {
            font-size: 11px;
            font-weight: 700;
            color: var(--primary);
            background: rgba(99, 102, 241, 0.08);
            padding: 4px 10px;
            border-radius: 20px;
            display: inline-block;
            margin-bottom: 12px;
        }

        .case-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

        .case-desc {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 文章列表 */
        .articles-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .article-card {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            box-shadow: var(--shadow-sm);
        }

        .article-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .article-link {
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .article-link:hover {
            text-decoration: underline;
        }

        /* 智能需求匹配与表单 */
        .form-section-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .form-info h3 {
            font-size: 26px;
            font-weight: 800;
            margin-bottom: 20px;
        }

        .form-info p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }

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

        .form-features li {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
            font-size: 15px;
            font-weight: 600;
        }

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

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

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

        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 14px;
            transition: all 0.3s;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
        }

        /* 页脚 */
        footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 80px 0 30px 0;
            border-top: none;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 50px;
        }

        .footer-logo-area img {
            margin-bottom: 20px;
        }

        .footer-logo-area p {
            font-size: 14px;
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .footer-title {
            font-size: 16px;
            font-weight: 700;
            color: #f8fafc;
            margin-bottom: 20px;
        }

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

        .footer-links li {
            margin-bottom: 12px;
        }

        .footer-links a {
            color: #94a3b8;
            font-size: 14px;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: #fff;
        }

        .footer-qrcode-wrapper {
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }

        .footer-qrcode {
            text-align: center;
        }

        .footer-qrcode img {
            width: 100px;
            height: 100px;
            border-radius: 6px;
            margin-bottom: 8px;
            background: #fff;
            padding: 4px;
        }

        .footer-qrcode span {
            font-size: 12px;
            display: block;
        }

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 30px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid #1e293b;
            font-size: 12px;
        }

        .friend-links a {
            color: #64748b;
        }

        .friend-links a:hover {
            color: #fff;
        }

        /* 浮动客服 */
        .float-service {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary-grad);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-lg);
            cursor: pointer;
            position: relative;
            border: none;
            transition: transform 0.3s;
        }

        .float-btn:hover {
            transform: scale(1.1);
        }

        .float-qrcode-box {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: #fff;
            border: 1px solid var(--border);
            padding: 12px;
            border-radius: 8px;
            box-shadow: var(--shadow-lg);
            display: none;
            text-align: center;
            width: 140px;
        }

        .float-qrcode-box img {
            width: 100%;
            height: auto;
            margin-bottom: 6px;
        }

        .float-qrcode-box span {
            font-size: 11px;
            color: var(--text-dark);
            font-weight: 600;
        }

        .float-btn:hover .float-qrcode-box {
            display: block;
        }

        /* 价格参考表格 */
        .price-badge {
            background: #dcfce7;
            color: #15803d;
            padding: 2px 8px;
            border-radius: 12px;
            font-size: 11px;
            font-weight: 700;
        }

        /* AI 术语百科与标签云 */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            max-width: 800px;
            margin: 0 auto;
        }

        .tag-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-muted);
            transition: all 0.2s;
        }

        .tag-item:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(99, 102, 241, 0.05);
            transform: translateY(-2px);
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            .services-grid, .reviews-grid, .cases-grid, .articles-list {
                grid-template-columns: repeat(2, 1fr);
            }
            .step-timeline {
                grid-template-columns: repeat(2, 1fr);
                gap: 40px;
            }
            .step-timeline::after {
                display: none;
            }
            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: #fff;
                padding: 20px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
            }
            .nav-menu.active {
                display: flex;
            }
            .nav-toggle {
                display: block;
            }
            .hero-title {
                font-size: 30px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .services-grid, .reviews-grid, .cases-grid, .articles-list, .metrics-grid {
                grid-template-columns: 1fr;
            }
            .form-section-wrapper {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .step-timeline {
                grid-template-columns: 1fr;
            }
        }