:root {
            --primary: #0f766e;
            --primary-light: #14b8a6;
            --primary-dark: #115e59;
            --accent: #06b6d4;
            --bg-gradient: linear-gradient(135deg, #f0fdfa 0%, #e6fffa 50%, #f8fafc 100%);
            --card-bg: #ffffff;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --border-color: #ccfbf1;
            --shadow: 0 10px 25px -5px rgba(15, 118, 110, 0.08), 0 8px 10px -6px rgba(15, 118, 110, 0.08);
            --radius: 12px;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            scroll-behavior: smooth;
        }

        body {
            background: var(--bg-gradient);
            color: var(--text-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 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);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }

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

        .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.5px;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 0; /* 严格按照要求设置为0 */
            list-style: none;
        }

        .nav-links a {
            padding: 8px 14px;
            color: var(--text-main);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: color 0.2s;
            white-space: nowrap;
        }

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

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 14px;
            font-weight: 600;
            border-radius: var(--radius);
            text-decoration: none;
            cursor: pointer;
            transition: all 0.25s ease;
            border: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #ffffff;
            box-shadow: 0 4px 12px rgba(15, 118, 110, 0.25);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(15, 118, 110, 0.35);
        }

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

        .btn-outline:hover {
            background: rgba(20, 184, 166, 0.05);
        }

        /* 移动端菜单按钮 */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            cursor: pointer;
            color: var(--primary);
        }

        /* Hero 首屏 (严格无图) */
        .hero {
            padding: 90px 0 70px;
            text-align: center;
            position: relative;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: rgba(20, 184, 166, 0.1);
            color: var(--primary);
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 24px;
            border: 1px solid rgba(20, 184, 166, 0.2);
        }

        .hero h1 {
            font-size: 44px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 20px;
            line-height: 1.25;
            max-width: 900px;
            margin-left: auto;
            margin-right: auto;
        }

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

        .hero p {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 720px;
            margin: 0 auto 36px;
            line-height: 1.6;
        }

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

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

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

        .metric-card:hover {
            transform: translateY(-4px);
        }

        .metric-value {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 6px;
        }

        .metric-label {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 通用区块样式 */
        section {
            padding: 80px 0;
            border-bottom: 1px solid rgba(204, 251, 241, 0.4);
        }

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

        .section-tag {
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--primary);
            margin-bottom: 10px;
            display: inline-block;
        }

        .section-header h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
        }

        .section-header p {
            font-size: 16px;
            color: var(--text-muted);
        }

        /* 卡片与网格 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 30px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px -10px rgba(15, 118, 110, 0.12);
        }

        .card-icon {
            width: 50px;
            height: 50px;
            border-radius: 10px;
            background: rgba(20, 184, 166, 0.1);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .card h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--text-main);
        }

        .card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            flex-grow: 1;
        }

        /* 流程步骤 */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .process-step {
            background: var(--card-bg);
            padding: 30px 20px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
            box-shadow: var(--shadow);
        }

        .step-num {
            width: 36px;
            height: 36px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin: 0 auto 16px;
            font-size: 15px;
        }

        .process-step h4 {
            font-size: 18px;
            margin-bottom: 10px;
            color: var(--text-main);
        }

        .process-step p {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 对比评测表格 */
        .comparison-wrapper {
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
            overflow: hidden;
        }

        .comparison-header-box {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            padding: 30px;
            text-align: center;
        }

        .comparison-header-box h3 {
            font-size: 24px;
            margin-bottom: 8px;
        }

        .rating-stars {
            font-size: 22px;
            color: #fbbf24;
            margin-bottom: 8px;
        }

        .rating-score {
            font-size: 16px;
            font-weight: 500;
            opacity: 0.9;
        }

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

        .comparison-table th, .comparison-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-color);
            font-size: 15px;
        }

        .comparison-table th {
            background: rgba(20, 184, 166, 0.05);
            font-weight: 600;
            color: var(--primary-dark);
        }

        .comparison-table td:nth-child(2) {
            font-weight: 600;
            color: var(--primary);
        }

        /* FAQ 折叠面板 */
        .faq-container {
            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: var(--radius);
            overflow: hidden;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.02);
        }

        .faq-question {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
        }

        .faq-question::after {
            content: '+';
            font-size: 20px;
            color: var(--primary);
            transition: transform 0.3s;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.6;
        }

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

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

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

        .testimonial-text {
            font-size: 14px;
            color: var(--text-main);
            font-style: italic;
            margin-bottom: 20px;
            line-height: 1.6;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .author-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
        }

        .author-info h5 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-main);
        }

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

        /* 标签云与价格参考 */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 20px;
        }

        .tag {
            padding: 8px 16px;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            font-size: 13px;
            color: var(--primary-dark);
            font-weight: 500;
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
            transition: all 0.2s;
        }

        .tag:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        /* 表单区域 */
        .form-section-wrapper {
            max-width: 700px;
            margin: 0 auto;
            background: var(--card-bg);
            padding: 40px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
        }

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

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

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 14px;
            color: var(--text-main);
            outline: none;
            transition: border-color 0.2s;
            background: #fafafa;
        }

        .form-control:focus {
            border-color: var(--primary);
            background: #fff;
        }

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

        /* 文章列表与友情链接 */
        .article-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
            margin: 0 auto;
        }

        .article-item {
            background: var(--card-bg);
            padding: 16px 20px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: transform 0.2s;
        }

        .article-item:hover {
            transform: translateX(4px);
        }

        .article-item a {
            color: var(--text-main);
            text-decoration: none;
            font-weight: 500;
            font-size: 15px;
        }

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

        .friend-links-box {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            margin-top: 30px;
        }

        .friend-links-box a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 13px;
            transition: color 0.2s;
        }

        .friend-links-box a:hover {
            color: var(--primary);
        }

        /* 页脚 */
        footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px;
            border-top: 1px solid #1e293b;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: #ffffff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 18px;
        }

        .footer-col p, .footer-col ul {
            font-size: 14px;
            line-height: 1.8;
            list-style: none;
        }

        .footer-col ul li a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s;
        }

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

        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #1e293b;
            font-size: 13px;
            color: #64748b;
        }

        /* 浮动客服 */
        .float-support {
            position: fixed;
            right: 30px;
            bottom: 30px;
            z-index: 999;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 15px;
            border-radius: var(--radius);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            text-align: center;
            max-width: 160px;
        }

        .float-support img {
            width: 120px;
            height: 120px;
            border-radius: 8px;
            margin-bottom: 8px;
            object-fit: cover;
        }

        .float-support span {
            font-size: 12px;
            font-weight: 600;
            color: var(--text-main);
            display: block;
        }

        /* 响应式适配 */
        @media (max-width: 1024px) {
            .metrics-grid, .grid-4, .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-3, .testimonials-grid, .footer-grid {
                grid-template-columns: 1fr;
            }
            .nav-links {
                display: none;
            }
            .menu-toggle {
                display: block;
            }
        }

        @media (max-width: 768px) {
            .hero h1 {
                font-size: 32px;
            }
            .metrics-grid, .grid-3, .grid-4, .process-steps {
                grid-template-columns: 1fr;
            }
            .float-support {
                display: none;
            }
        }