/* 变量定义与基础重置 */
        :root {
            --primary: #ec4899;      /* 高饱和霓虹粉 */
            --secondary: #3b82f6;    /* 亮丽科技蓝 */
            --accent: #8b5cf6;       /* 紫色过渡 */
            --dark: #0f172a;         /* 深灰色文字 */
            --light-bg: #f8fafc;     /* 主底色 */
            --card-bg: #ffffff;      /* 卡片白 */
            --border-color: #e2e8f0; /* 边框色 */
            --text-muted: #64748b;   /* 辅助文字 */
            --gradient: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, var(--secondary) 100%);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            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(--light-bg);
            color: var(--dark);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

        /* 统一外层居中容器 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            width: 100%;
        }

        /* 按钮样式 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: 99px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            font-size: 1rem;
        }

        .btn-gradient {
            background: var(--gradient);
            color: #ffffff;
            box-shadow: 0 4px 15px rgba(236, 72, 153, 0.3);
        }

        .btn-gradient:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(236, 72, 153, 0.5);
        }

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

        .btn-outline:hover {
            background: var(--dark);
            color: #ffffff;
            transform: translateY(-2px);
        }

        /* 顶部导航 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }

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

        .logo-text {
            font-size: 1.25rem;
            font-weight: 800;
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

        .nav-menu a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
        }

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

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 15px;
        }

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

        /* Section 通用样式 */
        section {
            padding: 80px 0;
            position: relative;
        }

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

        .section-header h2 {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-header h2::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: var(--gradient);
            border-radius: 2px;
        }

        .section-header p {
            color: var(--text-muted);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto;
        }

        /* Hero 首屏 - 无背景图，纯科技色块与渐变 */
        .hero-section {
            padding-top: 150px;
            padding-bottom: 100px;
            background: radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.1) 0%, rgba(59, 130, 246, 0.05) 50%, transparent 100%);
            overflow: hidden;
        }

        .hero-wrapper {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 3rem;
            line-height: 1.2;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 20px;
        }

        .hero-content h1 span {
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-content p {
            font-size: 1.2rem;
            color: var(--text-muted);
            margin-bottom: 30px;
            line-height: 1.8;
        }

        .hero-buttons {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }

        /* 数据指标卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .stat-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: 16px;
            text-align: center;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
            box-shadow: 0 10px 15px -3px rgba(139, 92, 246, 0.1);
        }

        .stat-number {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* 平台核心卡片展示 */
        .hero-visual {
            background: rgba(255, 255, 255, 0.8);
            border: 2px solid var(--border-color);
            border-radius: 24px;
            padding: 30px;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
            position: relative;
        }

        .hero-visual::before {
            content: '';
            position: absolute;
            top: -2px;
            left: -2px;
            right: -2px;
            bottom: -2px;
            background: var(--gradient);
            border-radius: 26px;
            z-index: -1;
            opacity: 0.5;
        }

        .feature-tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 15px;
        }

        .feature-tag {
            background: #f1f5f9;
            color: var(--dark);
            padding: 6px 12px;
            border-radius: 8px;
            font-size: 0.85rem;
            font-weight: 500;
            border: 1px solid var(--border-color);
        }

        /* 关于我们与平台介绍 */
        .about-section {
            background: #ffffff;
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.75rem;
            color: var(--dark);
            margin-bottom: 20px;
        }

        .about-text p {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 1.05rem;
        }

        .about-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .about-feature-item {
            padding: 15px;
            border-left: 4px solid var(--primary);
            background: var(--light-bg);
            border-radius: 0 12px 12px 0;
        }

        .about-feature-item h4 {
            font-size: 1.05rem;
            margin-bottom: 5px;
        }

        .about-feature-item p {
            font-size: 0.9rem;
            margin: 0;
        }

        /* 服务能力卡片 & 模型聚合 */
        .services-section {
            background: var(--light-bg);
        }

        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 30px;
            border-radius: 20px;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
            border-color: var(--primary);
        }

        .service-icon {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(236, 72, 153, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* 模型聚合标签云 */
        .model-cloud-wrapper {
            margin-top: 50px;
            padding: 30px;
            background: #ffffff;
            border-radius: 20px;
            border: 1px solid var(--border-color);
            text-align: center;
        }

        .model-cloud-wrapper h3 {
            margin-bottom: 20px;
            font-size: 1.4rem;
        }

        .model-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
        }

        .model-tag {
            padding: 8px 16px;
            background: #f1f5f9;
            border-radius: 99px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--dark);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .model-tag:hover {
            background: var(--gradient);
            color: #ffffff;
            border-color: transparent;
            transform: scale(1.05);
        }

        /* 流程步骤与时间线 */
        .timeline-section {
            background: #ffffff;
        }

        .timeline-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 20px;
            position: relative;
        }

        .timeline-item {
            text-align: center;
            position: relative;
            padding: 20px;
        }

        .timeline-badge {
            width: 60px;
            height: 60px;
            border-radius: 50px;
            background: var(--gradient);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: bold;
            margin: 0 auto 20px;
            box-shadow: 0 4px 10px rgba(236, 72, 153, 0.2);
        }

        .timeline-item h4 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }

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

        /* 案例展示中心 */
        .cases-section {
            background: var(--light-bg);
        }

        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-card {
            background: var(--card-bg);
            border-radius: 20px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
        }

        .case-image-wrapper {
            width: 100%;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #f1f5f9;
        }

        .case-image-wrapper img {
            width: 100%;
            height: auto;
            object-fit: cover;
            display: block;
        }

        .case-info {
            padding: 25px;
        }

        .case-tag {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--primary);
            text-transform: uppercase;
            margin-bottom: 10px;
            display: inline-block;
        }

        .case-info h3 {
            font-size: 1.25rem;
            margin-bottom: 10px;
            color: var(--dark);
        }

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

        /* 对比评测板块 */
        .comparison-section {
            background: #ffffff;
        }

        .score-box {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 30px;
            margin-bottom: 40px;
            padding: 30px;
            background: var(--light-bg);
            border-radius: 20px;
            border: 1px solid var(--border-color);
        }

        .score-num {
            font-size: 4rem;
            font-weight: 900;
            background: var(--gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .score-stars {
            display: flex;
            flex-direction: column;
        }

        .stars {
            color: #fbbf24;
            font-size: 1.75rem;
            margin-bottom: 5px;
        }

        .score-label {
            font-weight: 600;
            color: var(--dark);
        }

        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 600px;
        }

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

        .comparison-table th {
            background: var(--light-bg);
            font-weight: 700;
        }

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

        .comparison-table td strong {
            color: var(--primary);
        }

        /* Token 比价工具与智能需求匹配 */
        .pricing-section {
            background: var(--light-bg);
        }

        .pricing-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }

        .price-calculator {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 30px;
            border-radius: 20px;
        }

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

        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
        }

        .price-result {
            margin-top: 25px;
            padding: 20px;
            background: #f1f5f9;
            border-radius: 12px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .price-val {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
        }

        /* 培训课程板块 */
        .training-section {
            background: #ffffff;
        }

        .training-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 25px;
        }

        .training-card {
            background: var(--light-bg);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            padding: 25px;
            transition: var(--transition);
            text-align: center;
        }

        .training-card:hover {
            transform: translateY(-5px);
            border-color: var(--accent);
            background: #ffffff;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
        }

        .training-badge-icon {
            width: 50px;
            height: 50px;
            background: var(--gradient);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ffffff;
            font-weight: 800;
            margin: 0 auto 15px;
        }

        /* 用户评论板块 */
        .testimonials-section {
            background: var(--light-bg);
        }

        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .testimonial-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 25px;
            border-radius: 20px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
        }

        .user-info {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 15px;
        }

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

        .user-meta h4 {
            font-size: 1rem;
            margin-bottom: 2px;
        }

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

        .testimonial-text {
            color: var(--dark);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* FAQ 折叠面板 */
        .faq-section {
            background: #ffffff;
        }

        .faq-layout {
            display: grid;
            grid-template-columns: 2.2fr 0.8fr;
            gap: 40px;
        }

        .faq-container {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: 12px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-question {
            padding: 20px;
            background: #ffffff;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
        }

        .faq-question::after {
            content: '+';
            font-size: 1.5rem;
            color: var(--primary);
            transition: var(--transition);
        }

        .faq-item.active .faq-question::after {
            content: '-';
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            background: var(--light-bg);
            transition: max-height 0.3s ease-out;
        }

        .faq-answer-inner {
            padding: 20px;
            color: var(--text-muted);
            font-size: 0.95rem;
        }

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

        .troubleshoot-box {
            background: var(--light-bg);
            border: 1px solid var(--border-color);
            padding: 25px;
            border-radius: 20px;
        }

        .troubleshoot-box h3 {
            font-size: 1.25rem;
            margin-bottom: 15px;
        }

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

        .troubleshoot-list li {
            position: relative;
            padding-left: 20px;
            margin-bottom: 12px;
            font-size: 0.9rem;
        }

        .troubleshoot-list li::before {
            content: '●';
            position: absolute;
            left: 0;
            color: var(--primary);
        }

        /* 资讯与知识库 */
        .articles-section {
            background: var(--light-bg);
        }

        .articles-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }

        .article-card {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 25px;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

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

        .article-title {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 15px;
            color: var(--dark);
        }

        .article-meta {
            font-size: 0.85rem;
            color: var(--text-muted);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .article-link {
            color: var(--secondary);
            text-decoration: none;
            font-weight: 600;
        }

        .article-link:hover {
            text-decoration: underline;
        }

        /* 联系我们与加盟表单 */
        .contact-section {
            background: #ffffff;
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
        }

        .contact-info-panel {
            background: var(--light-bg);
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .contact-details {
            margin-bottom: 30px;
        }

        .contact-detail-item {
            margin-bottom: 20px;
            display: flex;
            align-items: flex-start;
            gap: 15px;
        }

        .contact-icon {
            font-size: 1.25rem;
            color: var(--primary);
        }

        .qrcode-area {
            display: grid;
            grid-template-columns: 1fr 1.5fr;
            gap: 20px;
            align-items: center;
            background: #ffffff;
            padding: 20px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
        }

        .qrcode-image img {
            width: 100%;
            height: auto;
            border-radius: 8px;
            display: block;
        }

        .qrcode-desc h4 {
            margin-bottom: 5px;
            font-size: 1rem;
        }

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

        .contact-form-panel {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 24px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
        }

        /* 友情链接与页脚 */
        footer {
            background: var(--dark);
            color: #94a3b8;
            padding: 60px 0 30px;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            border-bottom: 1px solid #334155;
            padding-bottom: 40px;
            margin-bottom: 30px;
        }

        .footer-brand h3 {
            color: #ffffff;
            font-size: 1.5rem;
            margin-bottom: 15px;
        }

        .footer-links h4 {
            color: #ffffff;
            margin-bottom: 15px;
        }

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

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

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

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

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

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

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

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

        .ai-page-home-link {
            color: #ffffff;
            text-decoration: none;
            font-weight: bold;
        }

        /* 浮动组件 */
        .float-tools {
            position: fixed;
            bottom: 30px;
            right: 30px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            z-index: 999;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: #ffffff;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid var(--border-color);
            position: relative;
        }

        .float-btn:hover {
            background: var(--gradient);
            color: #ffffff;
        }

        .float-btn svg {
            width: 24px;
            height: 24px;
            fill: currentColor;
        }

        .float-btn .tooltip-qr {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 10px;
            border-radius: 12px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
            display: none;
            width: 150px;
        }

        .float-btn .tooltip-qr img {
            width: 100%;
            height: auto;
            display: block;
        }

        .float-btn:hover .tooltip-qr {
            display: block;
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .hero-wrapper {
                grid-template-columns: 1fr;
            }
            .about-grid, .contact-grid, .pricing-grid, .faq-layout {
                grid-template-columns: 1fr;
            }
            .cases-grid, .testimonials-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: #ffffff;
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                gap: 15px;
            }

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

            .menu-toggle {
                display: block;
            }

            .cases-grid, .testimonials-grid, .stats-grid {
                grid-template-columns: 1fr;
            }

            .hero-content h1 {
                font-size: 2.25rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }

            .float-tools {
                bottom: 20px;
                right: 20px;
            }
        }