:root {
            --primary-grad: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
            --accent-grad: linear-gradient(135deg, #ec4899 0%, #f43f5e 100%);
            --light-bg: #f8fafc;
            --card-bg: #ffffff;
            --text-main: #0f172a;
            --text-muted: #475569;
            --border-color: #e2e8f0;
            --container-width: 1200px;
        }

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

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

        /* 统一容器 */
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        section {
            padding: 90px 0;
            border-bottom: 1px solid var(--border-color);
        }

        /* 渐变文本 */
        .text-gradient {
            background: var(--primary-grad);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* 按钮样式 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 9999px;
            text-decoration: none;
            transition: all 0.3s ease;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--primary-grad);
            color: #ffffff;
            box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
        }

        .btn-outline {
            background: transparent;
            color: #4f46e5;
            border: 2px solid #4f46e5;
        }

        .btn-outline:hover {
            background: rgba(79, 70, 229, 0.05);
            transform: translateY(-2px);
        }

        /* 顶部导航 */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            height: 70px;
            display: flex;
            align-items: center;
        }

        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

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

        .ai-page-logo {
            height: 38px;
            width: auto;
        }

        .nav {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .nav-list {
            display: flex;
            list-style: none;
            gap: 15px;
            overflow-x: auto;
            max-width: 700px;
            padding: 5px 0;
        }

        .nav-list::-webkit-scrollbar {
            height: 3px;
        }
        .nav-list::-webkit-scrollbar-thumb {
            background: #cbd5e1;
            border-radius: 3px;
        }

        .nav-link {
            text-decoration: none;
            color: var(--text-muted);
            font-size: 0.9rem;
            font-weight: 500;
            white-space: nowrap;
            transition: color 0.2s ease;
        }

        .nav-link:hover {
            color: #4f46e5;
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        /* 移动端菜单按钮 */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 5px;
        }

        /* Hero首屏 - 无图片设计 */
        .hero {
            padding-top: 140px;
            padding-bottom: 100px;
            background: radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
                        radial-gradient(circle at 10% 80%, rgba(79, 70, 229, 0.08) 0%, transparent 50%),
                        #ffffff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(79, 70, 229, 0.1);
            color: #4f46e5;
            border-radius: 9999px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 24px;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.03); }
        }

        .hero-title {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-main);
            max-width: 900px;
            margin: 0 auto 24px;
        }

        .hero-desc {
            font-size: 1.15rem;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto 36px;
        }

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

        .hero-tags {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero-tag-item {
            font-size: 0.8rem;
            padding: 4px 12px;
            background: #f1f5f9;
            color: var(--text-muted);
            border-radius: 6px;
            border: 1px solid var(--border-color);
        }

        /* 基础网格系统 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
            gap: 40px;
            align-items: center;
        }

        /* section头部 */
        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-tag {
            font-size: 0.85rem;
            color: #06b6d4;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
            display: block;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-main);
        }

        .section-desc {
            color: var(--text-muted);
            max-width: 600px;
            margin: 10px auto 0;
            font-size: 1rem;
        }

        /* 卡片通用 */
        .card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            transition: all 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
            border-color: #cbd5e1;
        }

        /* 数据指标卡片 */
        .stats-section {
            background: #ffffff;
            padding: 50px 0;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            text-align: center;
        }

        .stat-card {
            padding: 20px;
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: #4f46e5;
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 关于我们与平台介绍 */
        .about-content {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .features-list {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }

        .feature-item-tick {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        .feature-item-tick::before {
            content: "✓";
            color: #06b6d4;
            font-weight: bold;
        }

        /* 服务能力卡片 */
        .service-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: rgba(6, 182, 212, 0.1);
            color: #06b6d4;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        /* 对比表格 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            margin-top: 30px;
            background: #ffffff;
            border-radius: 16px;
            border: 1px solid var(--border-color);
        }

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

        .comparison-table th, .comparison-table td {
            padding: 16px 24px;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.95rem;
        }

        .comparison-table th {
            background-color: #f8fafc;
            color: var(--text-main);
            font-weight: 600;
        }

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

        .highlight-row {
            background-color: rgba(79, 70, 229, 0.02);
        }

        .text-success {
            color: #10b981;
            font-weight: bold;
        }

        .text-error {
            color: #ef4444;
        }

        /* 流程步骤 */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            position: relative;
        }

        .step-card {
            position: relative;
            z-index: 1;
        }

        .step-num {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary-grad);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin-bottom: 15px;
        }

        /* FAQ折叠面板 */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .faq-item {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

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

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

        .faq-item.active {
            border-color: #4f46e5;
            box-shadow: 0 4px 12px rgba(79, 70, 229, 0.05);
        }

        .faq-item.active .faq-answer {
            padding: 0 20px 20px 20px;
            max-height: 200px;
        }

        .faq-icon::after {
            content: "+";
            font-size: 1.2rem;
            transition: transform 0.3s ease;
            display: inline-block;
        }

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

        /* 客户评论 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .review-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 24px;
        }

        .review-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 15px;
        }

        .review-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: #f1f5f9;
            color: #4f46e5;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
        }

        .review-meta h4 {
            font-size: 0.95rem;
            color: var(--text-main);
        }

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

        .stars {
            color: #fbbf24;
            font-size: 0.9rem;
            margin-top: 4px;
        }

        /* 案例与素材区 */
        .showcase-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
        }

        .showcase-card {
            overflow: hidden;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            background: #ffffff;
        }

        .showcase-img-box {
            position: relative;
            background: #f1f5f9;
            overflow: hidden;
        }

        .showcase-img-box img {
            width: 100%;
            display: block;
            object-fit: cover;
            transition: transform 0.3s ease;
        }

        .showcase-card:hover .showcase-img-box img {
            transform: scale(1.05);
        }

        .showcase-body {
            padding: 20px;
        }

        .showcase-title {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 8px;
        }

        /* 培训课程板块 */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .training-card {
            border-left: 4px solid #4f46e5;
        }

        /* 智能匹配与联系表单 */
        .contact-layout {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 40px;
        }

        .contact-info-card {
            background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
            color: #ffffff;
            border-radius: 16px;
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .contact-info-card h3 {
            font-size: 1.8rem;
            margin-bottom: 15px;
            color: #ffffff;
        }

        .contact-details {
            margin: 30px 0;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .detail-item {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .detail-item span {
            color: #94a3b8;
        }

        .qrcode-box {
            display: flex;
            align-items: center;
            gap: 20px;
            background: rgba(255, 255, 255, 0.05);
            padding: 15px;
            border-radius: 12px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .qrcode-box img {
            width: 80px;
            height: 80px;
            border-radius: 6px;
            background: #ffffff;
        }

        .qrcode-text h5 {
            font-size: 0.95rem;
            color: #ffffff;
            margin-bottom: 4px;
        }

        .qrcode-text p {
            font-size: 0.8rem;
            color: #94a3b8;
        }

        .form-box {
            background: #ffffff;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            padding: 40px;
        }

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

        .form-label {
            display: block;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 8px;
        }

        .form-input, .form-select, .form-textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 0.95rem;
            color: var(--text-main);
            outline: none;
            transition: border-color 0.2s ease;
        }

        .form-input:focus, .form-select:focus, .form-textarea:focus {
            border-color: #4f46e5;
        }

        /* 术语与知识库 */
        .news-section {
            background: #ffffff;
        }

        .news-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .news-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .news-item {
            padding-bottom: 15px;
            border-bottom: 1px solid var(--border-color);
        }

        .news-item a {
            text-decoration: none;
            color: var(--text-main);
            font-weight: 600;
            font-size: 1rem;
            display: block;
            margin-bottom: 5px;
            transition: color 0.2s ease;
        }

        .news-item a:hover {
            color: #4f46e5;
        }

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

        /* 标签云与术语百科 */
        .wiki-card {
            background: #f8fafc;
            border-radius: 12px;
            padding: 24px;
            border: 1px solid var(--border-color);
        }

        .wiki-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 15px;
        }

        .wiki-tag {
            background: #ffffff;
            border: 1px solid var(--border-color);
            color: var(--text-muted);
            padding: 6px 14px;
            border-radius: 9999px;
            font-size: 0.85rem;
            text-decoration: none;
            transition: all 0.2s ease;
        }

        .wiki-tag:hover {
            border-color: #4f46e5;
            color: #4f46e5;
        }

        /* 浮动客服 */
        .float-contact {
            position: fixed;
            right: 20px;
            bottom: 20px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-btn {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-grad);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            transition: all 0.3s ease;
            position: relative;
            cursor: pointer;
        }

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

        .float-qr-hover {
            position: absolute;
            right: 60px;
            bottom: 0;
            background: white;
            padding: 10px;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            border: 1px solid var(--border-color);
            display: none;
            width: 150px;
            text-align: center;
        }

        .float-qr-hover img {
            width: 130px;
            height: 130px;
            display: block;
        }

        .float-qr-hover p {
            color: var(--text-main);
            font-size: 0.75rem;
            margin-top: 5px;
        }

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

        /* 页脚 */
        .footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px;
            font-size: 0.9rem;
        }

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

        .footer-brand p {
            margin-top: 15px;
            line-height: 1.6;
        }

        .footer-title {
            color: #ffffff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

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

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

        .footer-bottom {
            padding-top: 30px;
            border-top: 1px solid #1e293b;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
        }

        .friend-links {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }

        .friend-links a {
            color: #64748b;
            text-decoration: none;
            font-size: 0.85rem;
            transition: color 0.2s ease;
        }

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

        /* 移动端响应式优化 */
        @media (max-width: 992px) {
            .hero-title {
                font-size: 2.2rem;
            }
            .grid-2 {
                grid-template-columns: 1fr;
            }
            .contact-layout {
                grid-template-columns: 1fr;
            }
            .news-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .header {
                height: 60px;
            }
            .nav-list {
                display: none;
                position: absolute;
                top: 60px;
                left: 0;
                right: 0;
                background: #ffffff;
                flex-direction: column;
                padding: 20px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }
            .nav-list.active {
                display: flex;
            }
            .menu-toggle {
                display: block;
            }
            .hero {
                padding-top: 100px;
                padding-bottom: 60px;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
        }