:root {
            --primary: #ff5500;
            --primary-hover: #e04b00;
            --primary-light: #fff2ec;
            --secondary: #ff8800;
            --dark: #1f2329;
            --text-gray: #4e5969;
            --light-gray: #f7f8fa;
            --border-color: #e5e6eb;
            --white: #ffffff;
            --shadow: 0 4px 20px rgba(255, 85, 0, 0.08);
            --shadow-hover: 0 8px 30px rgba(255, 85, 0, 0.16);
            --radius: 12px;
            --max-width: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--dark);
            background-color: #fafbfc;
        }

        body {
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        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 {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 10px rgba(0,0,0,0.03);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo-box {
            display: flex;
            align-items: center;
            gap: 12px;
        }

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

        .nav-menu {
            display: flex;
            align-items: center;
        }

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

        .nav-links li a {
            padding: 10px 14px;
            font-size: 14px;
            font-weight: 500;
            color: var(--dark);
            display: inline-block;
        }

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

        .header-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: 8px;
            cursor: pointer;
            transition: all 0.3s ease;
            border: none;
            text-align: center;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            box-shadow: 0 4px 14px rgba(255, 85, 0, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 85, 0, 0.4);
        }

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

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

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

        /* 模块统一标题 */
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 12px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 12px;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-gray);
            max-width: 700px;
            margin: 0 auto;
        }

        .section {
            padding: 80px 0;
        }

        .bg-light {
            background-color: var(--white);
        }

        /* 首屏 HERO 区域 - 禁止使用图片 */
        .hero-section {
            padding: 90px 0 70px;
            background: radial-gradient(circle at 90% 10%, rgba(255, 85, 0, 0.08) 0%, transparent 40%),
                        radial-gradient(circle at 10% 90%, rgba(255, 136, 0, 0.05) 0%, transparent 40%),
                        #ffffff;
            position: relative;
            overflow: hidden;
        }

        .hero-content {
            text-align: center;
            max-width: 860px;
            margin: 0 auto;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: rgba(255, 85, 0, 0.08);
            border: 1px solid rgba(255, 85, 0, 0.2);
            border-radius: 30px;
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .hero-title {
            font-size: 42px;
            line-height: 1.25;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

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

        .hero-desc {
            font-size: 18px;
            color: var(--text-gray);
            margin-bottom: 36px;
            line-height: 1.6;
        }

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

        .hero-btn-lg {
            padding: 14px 36px;
            font-size: 16px;
        }

        /* 纯CSS数据卡片 (无图片) */
        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 20px;
        }

        .stat-card {
            background: var(--white);
            border: 1px solid var(--border-color);
            padding: 24px 16px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: transform 0.3s ease;
        }

        .stat-card:hover {
            transform: translateY(-50px);
            transform: translateY(-4px);
        }

        .stat-num {
            font-size: 30px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .stat-label {
            font-size: 13px;
            color: var(--text-gray);
        }

        /* 平台介绍与关于我们 */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 26px;
            margin-bottom: 16px;
        }

        .about-text p {
            color: var(--text-gray);
            margin-bottom: 20px;
        }

        .about-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }

        .about-feature-item {
            background: var(--light-gray);
            padding: 16px;
            border-radius: 8px;
            border-left: 4px solid var(--primary);
        }

        .about-feature-item h4 {
            font-size: 15px;
            margin-bottom: 4px;
        }

        .about-feature-item p {
            font-size: 12px;
            margin: 0;
        }

        /* 模型标签云 */
        .models-box {
            background: var(--white);
            border-radius: var(--radius);
            padding: 30px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
        }

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

        .model-tag {
            background: var(--light-gray);
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            transition: all 0.2s;
        }

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

        /* 服务与场景卡片 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .service-card {
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 28px;
            transition: all 0.3s ease;
        }

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

        .service-icon {
            width: 48px;
            height: 48px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 18px;
            margin-bottom: 10px;
        }

        .service-card p {
            font-size: 14px;
            color: var(--text-gray);
            line-height: 1.6;
        }

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

        .step-card {
            background: var(--white);
            padding: 24px;
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            position: relative;
        }

        .step-num {
            font-size: 36px;
            font-weight: 800;
            color: rgba(255, 85, 0, 0.2);
            position: absolute;
            top: 15px;
            right: 20px;
        }

        .step-card h4 {
            font-size: 16px;
            margin-bottom: 8px;
        }

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

        /* 案例展示区 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

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

        .case-img-box {
            overflow: hidden;
            max-height: 240px;
        }

        .case-img-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s;
        }

        .case-card:hover .case-img-box img {
            transform: scale(1.03);
        }

        .case-info {
            padding: 20px;
        }

        .case-info h4 {
            font-size: 18px;
            margin-bottom: 8px;
        }

        .case-info p {
            font-size: 14px;
            color: var(--text-gray);
        }

        /* 对比评测板块 */
        .comparison-box {
            background: var(--white);
            border-radius: var(--radius);
            padding: 32px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
        }

        .score-banner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: linear-gradient(135deg, #fff7f2, #ffece0);
            border: 1px solid rgba(255, 85, 0, 0.2);
            padding: 20px 30px;
            border-radius: 10px;
            margin-bottom: 30px;
        }

        .score-item {
            text-align: center;
        }

        .score-val {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary);
        }

        .score-star {
            color: #ffaa00;
            font-size: 20px;
        }

        .comp-table-wrapper {
            overflow-x: auto;
        }

        .comp-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 14px;
        }

        .comp-table th, .comp-table td {
            padding: 14px 18px;
            border-bottom: 1px solid var(--border-color);
        }

        .comp-table th {
            background: var(--light-gray);
            font-weight: 600;
        }

        .comp-table tr.highlight {
            background: var(--primary-light);
            font-weight: 600;
        }

        /* Token 比价表 */
        .token-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .token-card {
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 20px;
            text-align: center;
        }

        .token-card h4 {
            font-size: 16px;
            margin-bottom: 10px;
        }

        .price-tag {
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            margin: 10px 0;
        }

        /* 客户评论 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .review-card {
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: 0 2px 12px rgba(0,0,0,0.03);
        }

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

        .avatar-placeholder {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .user-info h5 {
            font-size: 15px;
        }

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

        .review-content {
            font-size: 13px;
            color: var(--text-gray);
            line-height: 1.6;
        }

        /* FAQ 折叠面板 */
        .faq-list {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
        }

        .faq-question {
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--white);
            transition: background 0.2s;
        }

        .faq-question:hover {
            background: var(--light-gray);
        }

        .faq-answer {
            padding: 0 24px 18px;
            font-size: 14px;
            color: var(--text-gray);
            display: none;
            border-top: 1px solid #f0f0f0;
            padding-top: 14px;
        }

        .faq-item.active .faq-answer {
            display: block;
        }

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

        .faq-icon {
            transition: transform 0.3s;
            font-weight: 300;
        }

        /* 文章资讯列表 */
        .article-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin-top: 20px;
        }

        .article-item {
            background: var(--white);
            padding: 16px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .article-item a {
            color: var(--dark);
            font-weight: 500;
            font-size: 14px;
        }

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

        /* 联系与需求匹配表单 */
        .contact-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            background: var(--white);
            border-radius: var(--radius);
            padding: 40px;
            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;
            margin-bottom: 6px;
        }

        .form-control {
            width: 100%;
            padding: 12px 14px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 14px;
            outline: none;
            transition: border-color 0.3s;
        }

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

        textarea.form-control {
            resize: vertical;
            height: 100px;
        }

        .contact-info-box {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .contact-method-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
        }

        .qr-code-img {
            width: 130px;
            height: 130px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 4px;
            background: var(--white);
        }

        /* 页脚规范 */
        .footer {
            background: #18191c;
            color: #a6aab2;
            padding: 60px 0 20px;
            font-size: 14px;
        }

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

        .footer-col h4 {
            color: var(--white);
            font-size: 16px;
            margin-bottom: 20px;
        }

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

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: #a6aab2;
        }

        .footer-links a:hover {
            color: var(--white);
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 15px;
        }

        .friend-links a {
            color: #8c9099;
            font-size: 13px;
        }

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

        .footer-bottom {
            border-top: 1px solid #2a2d33;
            padding-top: 20px;
            text-align: center;
            font-size: 13px;
            color: #71757e;
        }

        /* 浮动客服 */
        .float-kefu {
            position: fixed;
            right: 20px;
            bottom: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            background: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 16px rgba(255, 85, 0, 0.4);
            cursor: pointer;
            font-size: 12px;
            font-weight: 600;
            text-align: center;
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .hero-title { font-size: 32px; }
            .hero-stats { grid-template-columns: repeat(2, 1fr); }
            .grid-3, .process-steps, .token-grid, .reviews-grid { grid-template-columns: 1fr; }
            .about-grid, .case-grid, .contact-wrapper, .article-list { grid-template-columns: 1fr; }
            .footer-inner { grid-template-columns: 1fr 1fr; }
            
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 72px;
                left: 0;
                width: 100%;
                background: var(--white);
                border-bottom: 1px solid var(--border-color);
                padding: 20px 0;
                box-shadow: 0 10px 20px rgba(0,0,0,0.05);
            }

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

            .mobile-toggle {
                display: block;
            }
        }