:root {
            --primary: #FFD700;
            --primary-hover: #ECC000;
            --secondary: #212529;
            --bg-light: #FAFAFA;
            --bg-white: #FFFFFF;
            --text-dark: #1A1D20;
            --text-muted: #5A626A;
            --border-color: #E9ECEF;
            --max-width: 1200px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
            --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }

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

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

        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }

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

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 顶部导航 */
        header {
            background-color: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-sm);
        }

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

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

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

        .brand-name {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--secondary);
        }

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

        .nav-menu a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            padding: 5px 10px;
        }

        .nav-menu a:hover {
            color: var(--secondary);
            border-bottom: 2px solid var(--primary);
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 20px;
            border-radius: 6px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition);
            border: none;
        }

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

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

        .btn-secondary {
            background-color: var(--secondary);
            color: #fff;
        }

        .btn-secondary:hover {
            background-color: #000;
        }

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

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

        /* Hero首屏：不能使用任何背景图片，只使用纯色/渐变/几何块 */
        .hero {
            background: linear-gradient(135deg, #FFFDF0 0%, #FFF5CC 100%);
            padding: 90px 0;
            text-align: center;
            border-bottom: 4px solid var(--primary);
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -50px;
            right: -50px;
            width: 200px;
            height: 200px;
            background-color: rgba(255, 215, 0, 0.3);
            border-radius: 50%;
            z-index: 1;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -80px;
            left: -80px;
            width: 300px;
            height: 300px;
            background-color: rgba(255, 215, 0, 0.15);
            border-radius: 50%;
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            color: var(--secondary);
            margin-bottom: 20px;
            font-weight: 800;
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--text-muted);
            margin-bottom: 30px;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
        }

        /* 通用区块样式 */
        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

        section:nth-child(even) {
            background-color: var(--bg-white);
        }

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

        .section-header h2 {
            font-size: 2rem;
            color: var(--secondary);
            font-weight: 800;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-header h2::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background-color: var(--primary);
            margin: 8px auto 0;
            border-radius: 2px;
        }

        .section-header p {
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
        }

        /* 数据指标卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 25px;
            margin-top: 40px;
        }

        .stat-card {
            background-color: var(--bg-white);
            border: 2px solid var(--border-color);
            border-radius: 8px;
            padding: 30px 20px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .stat-card:hover {
            border-color: var(--primary);
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--secondary);
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 0.95rem;
            color: var(--text-muted);
            font-weight: 600;
        }

        /* 服务能力卡片 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 30px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

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

        .service-icon {
            font-size: 2rem;
            margin-bottom: 15px;
            color: var(--primary-hover);
        }

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

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

        /* 流程步骤 */
        .steps-container {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }

        .step-item {
            flex: 1;
            min-width: 200px;
            background: var(--bg-light);
            padding: 30px 20px;
            border-radius: 8px;
            text-align: center;
            position: relative;
            border-top: 4px solid var(--primary);
        }

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

        .step-item h3 {
            font-size: 1.1rem;
            margin-bottom: 10px;
        }

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

        /* 标签云 */
        .tags-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            max-width: 900px;
            margin: 0 auto;
        }

        .tag-item {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--secondary);
            transition: var(--transition);
        }

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

        /* 案例中心 */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
        }

        .case-card {
            background-color: var(--bg-white);
            border-radius: 8px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

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

        .case-img-wrap {
            height: 200px;
            overflow: hidden;
            background-color: #eaeaea;
        }

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

        .case-body {
            padding: 20px;
        }

        .case-tag {
            background-color: var(--primary);
            color: var(--secondary);
            font-size: 0.75rem;
            font-weight: bold;
            padding: 3px 8px;
            border-radius: 4px;
            display: inline-block;
            margin-bottom: 10px;
        }

        .case-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }

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

        /* 对比评测表格 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            background: var(--bg-white);
        }

        .eval-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 0.9rem;
        }

        .eval-table th, .eval-table td {
            padding: 15px 20px;
            border-bottom: 1px solid var(--border-color);
        }

        .eval-table th {
            background-color: var(--secondary);
            color: #fff;
        }

        .eval-table tr:hover {
            background-color: #FFFDF0;
        }

        .eval-badge {
            background-color: #28a745;
            color: #fff;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: bold;
        }

        .eval-badge-warning {
            background-color: #ffc107;
            color: #212529;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: bold;
        }

        .badge-star {
            color: #ffc107;
            font-size: 1rem;
        }

        /* 对比总评卡片 */
        .eval-summary-card {
            background-color: #FFFDF0;
            border: 2px solid var(--primary);
            border-radius: 8px;
            padding: 25px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 30px;
            flex-wrap: wrap;
            gap: 20px;
        }

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

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

        /* Token比价参考表格 */
        .price-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .price-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 25px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            position: relative;
        }

        .price-card.popular {
            border: 2px solid var(--primary);
        }

        .price-card.popular::after {
            content: '推荐';
            position: absolute;
            top: 0;
            right: 20px;
            background: var(--primary);
            color: var(--secondary);
            font-size: 0.7rem;
            font-weight: bold;
            padding: 2px 8px;
            border-radius: 0 0 4px 4px;
        }

        .price-model {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .price-val {
            font-size: 1.5rem;
            font-weight: 800;
            color: #dc3545;
            margin: 15px 0;
        }

        .price-unit {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* 评论卡片 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .review-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 25px;
            box-shadow: var(--shadow-sm);
            position: relative;
        }

        .review-body {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            font-style: italic;
        }

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

        .author-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--secondary);
        }

        .author-info h4 {
            font-size: 0.95rem;
            font-weight: 700;
        }

        .author-info p {
            font-size: 0.75rem;
            color: var(--text-muted);
        }

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

        .faq-item {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            overflow: hidden;
        }

        .faq-question {
            padding: 18px 25px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: var(--bg-white);
            transition: var(--transition);
        }

        .faq-question:hover {
            background-color: #FFFDF0;
        }

        .faq-answer {
            padding: 0 25px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            color: var(--text-muted);
            font-size: 0.9rem;
            border-top: 0 solid var(--border-color);
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 18px 25px;
            border-top: 1px solid var(--border-color);
        }

        .faq-icon::before {
            content: "+";
            font-size: 1.2rem;
            font-weight: bold;
        }

        .faq-item.active .faq-icon::before {
            content: "−";
        }

        /* 自助问题排查 & 术语百科 */
        .search-trouble-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .trouble-card, .glossary-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 30px;
        }

        .trouble-card h3, .glossary-card h3 {
            font-size: 1.25rem;
            margin-bottom: 20px;
            border-left: 4px solid var(--primary);
            padding-left: 10px;
        }

        .trouble-list, .glossary-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .trouble-list li, .glossary-list li {
            font-size: 0.9rem;
            display: flex;
            flex-direction: column;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 8px;
        }

        .trouble-list strong, .glossary-list strong {
            color: var(--secondary);
            margin-bottom: 2px;
        }

        .trouble-list span, .glossary-list span {
            color: var(--text-muted);
            font-size: 0.8rem;
        }

        /* 需求匹配表单 & 联系我们 & 代理加盟 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
        }

        .form-wrap {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 40px;
            box-shadow: var(--shadow-sm);
        }

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

        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 6px;
            font-size: 0.9rem;
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 0.9rem;
            background-color: var(--bg-light);
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            background-color: #fff;
        }

        .contact-info-wrap {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }

        .info-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 30px;
            box-shadow: var(--shadow-sm);
        }

        .info-card h3 {
            font-size: 1.2rem;
            margin-bottom: 15px;
            border-bottom: 2px solid var(--primary);
            padding-bottom: 8px;
            display: inline-block;
        }

        .info-details {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
            font-size: 0.9rem;
        }

        .info-details strong {
            color: var(--secondary);
        }

        .qr-codes {
            display: flex;
            gap: 20px;
            margin-top: 15px;
        }

        .qr-item {
            text-align: center;
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        .qr-item img {
            width: 100px;
            height: 100px;
            margin-bottom: 5px;
            border: 1px solid var(--border-color);
            padding: 4px;
            background: #fff;
        }

        /* 资讯文章列表 */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .article-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 25px;
            transition: var(--transition);
        }

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

        .article-card h3 {
            font-size: 1.05rem;
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .article-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 15px;
        }

        .article-link {
            font-size: 0.85rem;
            color: var(--secondary);
            font-weight: bold;
            text-decoration: underline;
        }

        /* 页脚 */
        footer {
            background-color: var(--secondary);
            color: #ced4da;
            padding: 60px 0 30px;
            font-size: 0.85rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 20px;
            position: relative;
        }

        .footer-col h4::after {
            content: '';
            display: block;
            width: 30px;
            height: 2px;
            background-color: var(--primary);
            margin-top: 5px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a:hover {
            color: var(--primary);
            padding-left: 4px;
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 20px;
            border-top: 1px solid #343a40;
            padding-top: 25px;
            margin-bottom: 25px;
        }

        .friend-links a {
            color: #6c757d;
        }

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

        .footer-bottom {
            border-top: 1px solid #343a40;
            padding-top: 25px;
            text-align: center;
            color: #6c757d;
        }

        .ai-page-home-link {
            color: var(--primary);
            font-weight: bold;
        }

        /* 浮动客服栏 */
        .float-bar {
            position: fixed;
            right: 20px;
            bottom: 80px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-item {
            width: 50px;
            height: 50px;
            background-color: var(--secondary);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: var(--shadow-md);
            position: relative;
            transition: var(--transition);
        }

        .float-item:hover {
            background-color: var(--primary);
            color: var(--secondary);
        }

        .float-item-text {
            font-size: 0.75rem;
            text-align: center;
            font-weight: bold;
            line-height: 1.2;
        }

        .float-item .popover {
            position: absolute;
            right: 60px;
            bottom: 0;
            background-color: #fff;
            border: 1px solid var(--border-color);
            padding: 15px;
            border-radius: 8px;
            box-shadow: var(--shadow-md);
            display: none;
            width: 180px;
            text-align: center;
            color: var(--secondary);
        }

        .float-item:hover .popover {
            display: block;
        }

        .float-item .popover img {
            width: 120px;
            height: 120px;
            margin: 0 auto 8px;
        }

        .float-item .popover p {
            font-size: 0.75rem;
            color: var(--text-muted);
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .contact-grid {
                grid-template-columns: 1fr;
            }
            .search-trouble-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(--bg-white);
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                box-shadow: var(--shadow-md);
            }

            .nav-menu.active {
                display: flex;
            }

            .menu-toggle {
                display: flex;
            }

            .hero h1 {
                font-size: 2rem;
            }

            .steps-container {
                flex-direction: column;
            }
        }