:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --accent: #ec4899;
            --accent-cyan: #06b6d4;
            --bg-color: #f8fafc;
            --text-color: #1e293b;
            --text-muted: #64748b;
            --card-bg: #ffffff;
            --border-color: #e2e8f0;
            --max-width: 1280px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            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-color);
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        ul {
            list-style: none;
        }

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

        /* 顶部导航 */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            height: 72px;
            display: flex;
            align-items: center;
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--primary-dark);
        }

        .ai-page-logo {
            height: 36px;
            width: auto;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 0;
        }

        .nav-links a {
            padding: 8px 12px;
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--text-color);
            transition: var(--transition);
            border-radius: 6px;
        }

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

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 20px;
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            border: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #ffffff;
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
        }

        .btn-primary:hover {
            opacity: 0.9;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(99, 102, 241, 0.35);
        }

        .btn-outline {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-color);
        }

        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        /* 移动端菜单开关 */
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 5px;
        }

        .menu-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--text-color);
            transition: var(--transition);
        }

        /* Hero 首屏 - 严禁出现图片 */
        .hero {
            padding: 90px 0 60px;
            background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.08) 0%, rgba(236, 72, 153, 0.05) 50%, transparent 100%);
            text-align: center;
            position: relative;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: rgba(99, 102, 241, 0.1);
            color: var(--primary-dark);
            border-radius: 50px;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 24px;
            animation: fadeInDown 0.8s ease;
        }

        .hero h1 {
            font-size: clamp(2.2rem, 4.5vw, 3.5rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
            color: var(--text-color);
            line-height: 1.2;
        }

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

        .hero p {
            font-size: clamp(1rem, 2vw, 1.25rem);
            color: var(--text-muted);
            max-width: 760px;
            margin: 0 auto 36px;
        }

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

        /* 斑斓彩调风格区块与卡片 */
        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 50px;
        }

        .section-header span {
            color: var(--primary);
            font-weight: 600;
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 8px;
            display: block;
        }

        .section-header h2 {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            font-weight: 700;
            color: var(--text-color);
            margin-bottom: 16px;
        }

        .section-header p {
            color: var(--text-muted);
            font-size: 1.05rem;
        }

        /* 数据指标卡片 */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            margin-bottom: 40px;
        }

        .metric-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px 24px;
            text-align: center;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
            transition: var(--transition);
        }

        .metric-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
            box-shadow: 0 12px 24px -4px rgba(99, 102, 241, 0.1);
        }

        .metric-card h3 {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 8px;
        }

        .metric-card p {
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 服务能力网格 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }

        .service-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 32px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

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

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 30px -10px rgba(0, 0, 0, 0.05);
            border-color: var(--primary);
        }

        .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: 1.5rem;
            font-weight: bold;
            margin-bottom: 20px;
        }

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

        .service-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* 流程步骤 */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 24px;
            position: relative;
        }

        .step-item {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            text-align: center;
            position: relative;
        }

        .step-number {
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin: 0 auto 20px;
        }

        .step-item h4 {
            font-size: 1.15rem;
            margin-bottom: 10px;
            font-weight: 600;
        }

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

        /* 对比表格 */
        .comparison-table-wrapper {
            overflow-x: auto;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.02);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 650px;
        }

        .comparison-table th, .comparison-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.95rem;
        }

        .comparison-table th {
            background: rgba(99, 102, 241, 0.05);
            font-weight: 700;
            color: var(--text-color);
        }

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

        .highlight-col {
            background: rgba(99, 102, 241, 0.02);
            font-weight: 600;
            color: var(--primary-dark);
        }

        /* 评分与推荐展示区 */
        .rating-banner {
            background: linear-gradient(135deg, #1e293b, #0f172a);
            color: #ffffff;
            border-radius: 20px;
            padding: 48px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 30px;
            margin-top: 50px;
        }

        .rating-info h3 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .rating-info p {
            color: #94a3b8;
            font-size: 1.05rem;
        }

        .rating-score-box {
            text-align: center;
            background: rgba(255, 255, 255, 0.1);
            padding: 24px 36px;
            border-radius: 16px;
            backdrop-filter: blur(8px);
        }

        .rating-score-box .stars {
            color: #fbbf24;
            font-size: 1.5rem;
            margin-bottom: 8px;
        }

        .rating-score-box .score {
            font-size: 2.5rem;
            font-weight: 800;
            color: #ffffff;
        }

        .rating-score-box .score span {
            font-size: 1rem;
            color: #94a3b8;
        }

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

        .testimonial-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

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

        .user-info h5 {
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-color);
        }

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

        /* 文章列表与标签云 */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-bottom: 40px;
        }

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

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

        .article-card a {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-color);
            display: block;
        }

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

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 30px;
        }

        .tag-cloud span, .tag-cloud a {
            background: rgba(99, 102, 241, 0.08);
            color: var(--primary-dark);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.875rem;
            font-weight: 500;
            transition: var(--transition);
        }

        .tag-cloud span:hover, .tag-cloud a:hover {
            background: var(--primary);
            color: #fff;
        }

        /* FAQ 折叠面板 */
        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

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

        .faq-question {
            padding: 20px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-question::after {
            content: '+';
            font-size: 1.25rem;
            color: var(--primary);
            transition: transform 0.3s ease;
        }

        .faq-item.active .faq-question::after {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            transition: all 0.3s ease;
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 0 24px 20px 24px;
        }

        /* 表单区域 */
        .form-section {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.03), rgba(236, 72, 153, 0.03));
        }

        .form-container {
            max-width: 700px;
            margin: 0 auto;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            padding: 48px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.03);
        }

        .form-group {
            margin-bottom: 24px;
        }

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

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

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

        textarea.form-control {
            resize: vertical;
            min-height: 120px;
        }

        /* 底部信息 */
        footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: #ffffff;
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .footer-col p, .footer-col ul li {
            font-size: 0.9rem;
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            color: #94a3b8;
            transition: var(--transition);
        }

        .footer-col ul li a:hover {
            color: #ffffff;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 0.85rem;
            color: #64748b;
        }

        /* 浮动客服 */
        .floating-kefu {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            background: var(--primary);
            color: #fff;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 25px rgba(99, 102, 241, 0.4);
            cursor: pointer;
            transition: var(--transition);
        }

        .floating-kefu:hover {
            transform: scale(1.08);
        }

        .kefu-popup {
            position: fixed;
            bottom: 105px;
            right: 30px;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: 16px;
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            display: none;
            z-index: 1000;
            text-align: center;
            width: 220px;
        }

        .kefu-popup img {
            width: 160px;
            height: 160px;
            border-radius: 8px;
            margin-bottom: 10px;
            object-fit: cover;
        }

        .kefu-popup p {
            font-size: 0.85rem;
            color: var(--text-color);
            font-weight: 600;
        }

        /* 响应式媒体查询 */
        @media (max-width: 992px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                padding: 20px 0;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 10px 20px rgba(0,0,0,0.05);
            }
            .nav-links.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
        }

        @keyframes fadeInDown {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }