:root {
            --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #06b6d4 100%);
            --accent-color: #6366f1;
            --accent-hover: #4f46e5;
            --secondary-color: #06b6d4;
            --bg-light: #f8fafc;
            --bg-card: #ffffff;
            --text-dark: #0f172a;
            --text-muted: #475569;
            --border-color: #e2e8f0;
            --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
            --shadow-lg: 0 20px 25px -5px rgba(99, 102, 241, 0.12), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
            --radius-md: 12px;
            --radius-lg: 20px;
            --container-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;
            background-color: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
            background: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.05) 0%, rgba(248, 250, 252, 0) 70%);
        }

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

        /* 顶部导航 */
        .site-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);
            transition: all 0.3s ease;
        }

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

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

        .ai-page-logo {
            height: 42px;
            width: auto;
            object-fit: contain;
        }

        .brand-name {
            font-size: 20px;
            font-weight: 800;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .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-dark);
            font-size: 15px;
            font-weight: 500;
            text-decoration: none;
            transition: color 0.2s ease;
            white-space: nowrap;
        }

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

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            font-size: 15px;
            font-weight: 600;
            border-radius: 99px;
            text-decoration: none;
            transition: all 0.25s ease;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--primary-gradient);
            color: #ffffff;
            box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
        }

        .btn-outline {
            background: transparent;
            color: var(--accent-color);
            border: 2px solid var(--accent-color);
        }

        .btn-outline:hover {
            background: rgba(99, 102, 241, 0.08);
            transform: translateY(-2px);
        }

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

        /* 英雄首屏区 - 严格禁止图片 */
        .hero-section {
            padding: 90px 0 60px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: rgba(99, 102, 241, 0.08);
            border: 1px solid rgba(99, 102, 241, 0.2);
            border-radius: 99px;
            color: var(--accent-color);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .hero-title {
            font-size: 42px;
            line-height: 1.25;
            font-weight: 900;
            color: var(--text-dark);
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

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

        .hero-subtitle {
            font-size: 19px;
            color: var(--text-muted);
            max-width: 820px;
            margin: 0 auto 36px auto;
            line-height: 1.7;
        }

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

        .hero-cta-btn {
            padding: 14px 36px;
            font-size: 17px;
        }

        /* 数据卡片区 */
        .hero-metrics {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 30px;
        }

        .metric-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px 16px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: transform 0.3s ease;
        }

        .metric-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .metric-number {
            font-size: 32px;
            font-weight: 800;
            color: var(--accent-color);
            margin-bottom: 4px;
        }

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

        /* 通用 Section 基础 */
        .section-padding {
            padding: 80px 0;
        }

        .section-title-wrap {
            text-align: center;
            max-width: 750px;
            margin: 0 auto 50px auto;
        }

        .section-tag {
            font-size: 14px;
            font-weight: 700;
            color: var(--accent-color);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
            display: block;
        }

        .section-h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: 16px;
        }

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

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

        .about-content-box {
            background: var(--bg-card);
            padding: 36px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .about-feature-list {
            list-style: none;
            margin-top: 20px;
        }

        .about-feature-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 16px;
            font-size: 15px;
            color: var(--text-dark);
        }

        .about-feature-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: rgba(99, 102, 241, 0.15);
            color: var(--accent-color);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 12px;
            flex-shrink: 0;
            margin-top: 2px;
        }

        /* 服务能力卡片 (3列) */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .service-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .service-card:hover {
            transform: translateY(-6px);
            border-color: var(--accent-color);
            box-shadow: var(--shadow-lg);
        }

        .service-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(6, 182, 212, 0.1));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-dark);
        }

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

        /* 标签云模型展示 */
        .model-tags-container {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 30px;
            border: 1px solid var(--border-color);
            margin-top: 40px;
        }

        .model-tags-title {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-dark);
            text-align: center;
        }

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

        .tag-item {
            padding: 6px 14px;
            background: rgba(241, 245, 249, 0.8);
            border: 1px solid var(--border-color);
            border-radius: 99px;
            font-size: 13px;
            color: var(--text-muted);
            transition: all 0.2s ease;
        }

        .tag-item:hover {
            background: var(--accent-color);
            color: #ffffff;
            border-color: var(--accent-color);
        }

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

        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
            position: relative;
        }

        .step-num {
            width: 36px;
            height: 36px;
            background: var(--primary-gradient);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            margin: 0 auto 16px auto;
        }

        /* 案例中心 (带有规定图片) */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

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

        .case-img-wrap {
            width: 100%;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: #e2e8f0;
        }

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

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

        .case-info {
            padding: 20px;
        }

        .case-info h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

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

        /* 对比评测表格 */
        .rating-box {
            background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(6, 182, 212, 0.05));
            border: 1px solid rgba(99, 102, 241, 0.2);
            border-radius: var(--radius-lg);
            padding: 30px;
            margin-bottom: 40px;
            display: flex;
            align-items: center;
            justify-content: space-around;
            flex-wrap: wrap;
            gap: 20px;
        }

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

        .rating-score-val {
            font-size: 48px;
            font-weight: 900;
            color: var(--accent-color);
            line-height: 1;
        }

        .rating-stars {
            color: #f59e0b;
            font-size: 24px;
            margin-top: 6px;
        }

        .table-responsive {
            width: 100%;
            overflow-x: auto;
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            min-width: 600px;
        }

        .compare-table th, .compare-table td {
            padding: 16px 20px;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
        }

        .compare-table th {
            background: #f1f5f9;
            font-weight: 700;
            color: var(--text-dark);
        }

        .compare-table th.highlight-col, .compare-table td.highlight-col {
            background: rgba(99, 102, 241, 0.04);
            font-weight: 600;
        }

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

        .token-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
        }

        .token-price {
            font-size: 28px;
            font-weight: 800;
            color: var(--accent-color);
            margin: 12px 0;
        }

        /* 用户评论区 (6条) */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .review-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            box-shadow: var(--shadow-sm);
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
        }

        .avatar-placeholder {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }

        .user-info h5 {
            font-size: 15px;
            font-weight: 700;
        }

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

        .review-text {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* FAQ折叠面板 */
        .faq-accordion {
            max-width: 900px;
            margin: 0 auto;
        }

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

        .faq-question {
            width: 100%;
            padding: 20px 24px;
            text-align: left;
            background: none;
            border: none;
            font-size: 16px;
            font-weight: 700;
            color: var(--text-dark);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
        }

        .faq-answer {
            padding: 0 24px 20px 24px;
            font-size: 14px;
            color: var(--text-muted);
            display: none;
            border-top: 1px dashed var(--border-color);
            padding-top: 16px;
        }

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

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

        .faq-icon {
            transition: transform 0.3s ease;
        }

        /* 文章与新闻 */
        .article-links-box {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 30px;
        }

        .article-list {
            list-style: none;
        }

        .article-item {
            padding: 12px 0;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .article-item:last-child {
            border-bottom: none;
        }

        .article-item a {
            color: var(--text-dark);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s;
        }

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

        /* 联系与表单区 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .contact-info-box {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 36px;
        }

        .contact-detail {
            margin-top: 24px;
        }

        .contact-detail-item {
            margin-bottom: 16px;
            font-size: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .qr-wrap {
            margin-top: 24px;
            text-align: center;
            display: inline-block;
        }

        .qr-wrap img {
            width: 140px;
            height: 140px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
        }

        .form-box {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 36px;
            box-shadow: var(--shadow-sm);
        }

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

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

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

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

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

        /* 页脚 */
        .site-footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            margin-top: 80px;
        }

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

        .footer-brand h4 {
            color: #ffffff;
            font-size: 20px;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.6;
        }

        .footer-col h5 {
            color: #ffffff;
            font-size: 16px;
            margin-bottom: 16px;
        }

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

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

        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.2s;
        }

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

        .friendship-links {
            border-top: 1px solid #1e293b;
            padding-top: 24px;
            margin-bottom: 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
            font-size: 13px;
        }

        .friendship-links a {
            color: #94a3b8;
            text-decoration: none;
        }

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

        .copyright-bar {
            text-align: center;
            font-size: 13px;
            color: #64748b;
            border-top: 1px solid #1e293b;
            padding-top: 20px;
        }

        /* 浮动客服 */
        .floating-kefu {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 999;
            background: var(--primary-gradient);
            color: white;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 25px rgba(99, 102, 241, 0.4);
            cursor: pointer;
            text-decoration: none;
            font-size: 24px;
            transition: transform 0.2s;
        }

        .floating-kefu:hover {
            transform: scale(1.1);
        }

        /* 响应式适配 */
        @media (max-width: 1024px) {
            .hero-metrics, .services-grid, .token-grid, .reviews-grid, .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-grid, .contact-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 76px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                padding: 20px 0;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-lg);
            }

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

            .mobile-menu-btn {
                display: block;
            }

            .hero-title {
                font-size: 28px;
            }

            .hero-subtitle {
                font-size: 15px;
            }

            .hero-metrics, .services-grid, .case-grid, .token-grid, .reviews-grid, .process-steps, .footer-grid {
                grid-template-columns: 1fr;
            }

            .header-actions {
                display: none;
            }
        }