/* 渐变青科技风 基础样式变量 */
        :root {
            --primary: #028090;
            --primary-dark: #05668d;
            --primary-light: #e0f2f1;
            --accent: #00a896;
            --accent-bright: #00f5d4;
            --bg-main: #f8fafc;
            --bg-card: #ffffff;
            --bg-alt: #eff6f7;
            --text-dark: #0f172a;
            --text-muted: #475569;
            --border-color: #cbd5e1;
            --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 12px rgba(2,128,144,0.08);
            --shadow-lg: 0 10px 25px rgba(2,128,144,0.12);
            --radius: 8px;
            --transition: all 0.3s ease;
        }

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

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

        /* 统一主容器规范 */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header 与 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 rgba(2, 128, 144, 0.15);
            box-shadow: var(--shadow-sm);
        }

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

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

        .brand-logo img {
            max-height: 40px;
            width: auto;
        }

        .brand-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: -0.5px;
        }

        /* 严格要求：.nav-links 的 gap 属性设置为 0 */
        .nav-links {
            display: flex;
            align-items: center;
            gap: 0;
            list-style: none;
        }

        .nav-links li a {
            display: inline-block;
            padding: 8px 12px;
            color: var(--text-dark);
            text-decoration: none;
            font-size: 0.92rem;
            font-weight: 500;
            transition: var(--transition);
        }

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

        .header-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: 6px;
            text-decoration: none;
            transition: var(--transition);
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #ffffff;
            box-shadow: 0 4px 10px rgba(2, 128, 144, 0.25);
        }

        .btn-primary:hover {
            opacity: 0.92;
            transform: translateY(-1px);
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 1.5px solid var(--primary);
        }

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

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-dark);
            cursor: pointer;
        }

        /* 页面主结构 */
        main {
            width: 100%;
        }

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

        .section-bg-alt {
            background-color: var(--bg-alt);
        }

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

        .section-badge {
            display: inline-block;
            padding: 4px 14px;
            background: var(--primary-light);
            color: var(--primary-dark);
            font-size: 0.85rem;
            font-weight: 700;
            border-radius: 50px;
            margin-bottom: 12px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .section-title {
            font-size: 2.1rem;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: 15px;
            line-height: 1.3;
        }

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

        /* 首屏 Hero Section - 严格限制：无任何图片 */
        .hero-section {
            background: linear-gradient(135deg, #eef9f9 0%, #f8fafc 50%, #e0f2f1 100%);
            padding: 90px 0 70px 0;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid rgba(2, 128, 144, 0.1);
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -10%;
            right: -5%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0,245,212,0.15) 0%, rgba(255,255,255,0) 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-content {
            text-align: center;
            max-width: 880px;
            margin: 0 auto;
        }

        .hero-badge-wrap {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #ffffff;
            border: 1px solid rgba(2, 128, 144, 0.3);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.88rem;
            color: var(--primary-dark);
            margin-bottom: 24px;
            box-shadow: var(--shadow-sm);
        }

        .hero-badge-dot {
            width: 8px;
            height: 8px;
            background-color: var(--accent-bright);
            border-radius: 50%;
            box-shadow: 0 0 8px var(--accent);
        }

        /* H1 限制 20 字以内 */
        .hero-title {
            font-size: 2.6rem;
            font-weight: 900;
            color: var(--text-dark);
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-muted);
            margin-bottom: 35px;
            max-width: 760px;
            margin-left: auto;
            margin-right: auto;
        }

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

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            background: #ffffff;
            padding: 24px;
            border-radius: 12px;
            border: 1px solid rgba(2, 128, 144, 0.15);
            box-shadow: var(--shadow-md);
        }

        .stat-item {
            text-align: center;
            border-right: 1px solid var(--border-color);
        }

        .stat-item:last-child {
            border-right: none;
        }

        .stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

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

        .about-card {
            background: var(--bg-card);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .about-card h3 {
            font-size: 1.3rem;
            color: var(--primary-dark);
            margin-bottom: 15px;
        }

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

        .feature-list li {
            position: relative;
            padding-left: 24px;
            margin-bottom: 12px;
            font-size: 0.95rem;
            color: var(--text-muted);
        }

        .feature-list li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--primary);
            font-weight: bold;
        }

        /* 卡片网格：服务与能力 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

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

        .service-card {
            background: var(--bg-card);
            padding: 24px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary);
        }

        .service-icon {
            width: 48px;
            height: 48px;
            background: var(--primary-light);
            color: var(--primary-dark);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            font-weight: bold;
            margin-bottom: 16px;
        }

        .service-card h4 {
            font-size: 1.1rem;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

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

        /* 标签云模型墙 */
        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 30px;
        }

        .model-tag {
            background: #ffffff;
            border: 1px solid rgba(2, 128, 144, 0.2);
            color: var(--text-dark);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.88rem;
            font-weight: 500;
            transition: var(--transition);
        }

        .model-tag:hover {
            background: var(--primary);
            color: #ffffff;
        }

        /* 案例展示区 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .case-card {
            background: var(--bg-card);
            border-radius: 10px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .case-img-wrap {
            width: 100%;
            background: #e2e8f0;
            overflow: hidden;
        }

        .case-img-wrap img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }

        .case-body {
            padding: 20px;
        }

        .case-title {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

        .case-desc {
            font-size: 0.88rem;
            color: var(--text-muted);
        }

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

        .step-card {
            background: var(--bg-card);
            padding: 24px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            position: relative;
            text-align: center;
        }

        .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 auto;
        }

        /* 对比评测板块 */
        .rating-box {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            color: #ffffff;
            padding: 30px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 40px;
        }

        .rating-left {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .rating-score {
            font-size: 3rem;
            font-weight: 900;
            line-height: 1;
            color: var(--accent-bright);
        }

        .rating-stars {
            color: #f59e0b;
            font-size: 1.4rem;
        }

        .compare-table-wrap {
            overflow-x: auto;
            background: #ffffff;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 0.92rem;
        }

        .compare-table th, 
        .compare-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-color);
        }

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

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

        .highlight-col {
            background: rgba(2, 128, 144, 0.04);
            font-weight: 600;
            color: var(--primary-dark);
        }

        /* Token 比价表 */
        .pricing-table {
            width: 100%;
            border-collapse: collapse;
            background: #fff;
            border-radius: 10px;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        .pricing-table th, .pricing-table td {
            padding: 14px 18px;
            border-bottom: 1px solid var(--border-color);
            text-align: left;
            font-size: 0.9rem;
        }

        .pricing-table th {
            background: var(--primary-light);
            color: var(--primary-dark);
        }

        .tag-discount {
            display: inline-block;
            background: #ef4444;
            color: #fff;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.75rem;
            font-weight: bold;
        }

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

        .review-card {
            background: var(--bg-card);
            padding: 24px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

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

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

        .review-meta h5 {
            font-size: 0.95rem;
            color: var(--text-dark);
        }

        .review-meta span {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .review-text {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-style: italic;
        }

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

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

        .faq-question {
            width: 100%;
            padding: 18px 24px;
            background: none;
            border: none;
            text-align: left;
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-dark);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
        }

        .faq-answer {
            padding: 0 24px 18px 24px;
            color: var(--text-muted);
            font-size: 0.92rem;
            display: none;
        }

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

        .faq-toggle-icon {
            font-size: 1.2rem;
            transition: var(--transition);
        }

        .faq-item.active .faq-toggle-icon {
            transform: rotate(45deg);
        }

        /* 表单与联系区 */
        .contact-wrap {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 40px;
            background: var(--bg-card);
            padding: 40px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }

        .contact-info h3 {
            font-size: 1.5rem;
            color: var(--primary-dark);
            margin-bottom: 15px;
        }

        .info-item {
            margin-bottom: 20px;
        }

        .info-item label {
            display: block;
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 4px;
        }

        .info-item p {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
        }

        .qr-box {
            margin-top: 20px;
            padding: 15px;
            background: var(--bg-alt);
            border-radius: 8px;
            display: inline-block;
            text-align: center;
        }

        .qr-box img {
            width: 140px;
            height: 140px;
            object-fit: cover;
            border-radius: 4px;
        }

        .form-group {
            margin-bottom: 16px;
        }

        .form-group label {
            display: block;
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 6px;
        }

        .form-control {
            width: 100%;
            padding: 12px 14px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 0.95rem;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(2, 128, 144, 0.15);
        }

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

        /* 页脚区域 */
        footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 30px;
            margin-bottom: 40px;
        }

        .footer-brand h4 {
            color: #ffffff;
            font-size: 1.2rem;
            margin-bottom: 15px;
        }

        .footer-col h5 {
            color: #ffffff;
            font-size: 1rem;
            margin-bottom: 15px;
        }

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

        .footer-links li {
            margin-bottom: 8px;
        }

        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: var(--transition);
        }

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

        .friend-links-box {
            border-top: 1px solid #334155;
            padding-top: 20px;
            margin-bottom: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            align-items: center;
        }

        .friend-links-box a {
            color: #94a3b8;
            text-decoration: none;
            font-size: 0.85rem;
        }

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

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
            color: #64748b;
        }

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

        .float-btn {
            width: 48px;
            height: 48px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: var(--shadow-lg);
            transition: var(--transition);
            font-size: 0.8rem;
            font-weight: bold;
            text-align: center;
        }

        .float-btn:hover {
            transform: scale(1.08);
            background: var(--primary-dark);
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .grid-3, .case-grid, .reviews-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-4, .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
            .about-grid, .contact-wrap {
                grid-template-columns: 1fr;
            }
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-item {
                border-right: none;
                border-bottom: 1px solid var(--border-color);
                padding-bottom: 12px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                padding: 15px 0;
                border-bottom: 1px solid var(--border-color);
                box-shadow: var(--shadow-md);
            }
            .nav-links.active {
                display: flex;
            }
            .mobile-toggle {
                display: block;
            }
            .grid-3, .grid-4, .case-grid, .reviews-grid, .process-steps {
                grid-template-columns: 1fr;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .hero-btns {
                flex-direction: column;
            }
            .rating-box {
                flex-direction: column;
                text-align: center;
                gap: 15px;
            }
            .rating-left {
                flex-direction: column;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }