:root {
            --primary: #FF5E00; /* 明艳撞色：橙色 */
            --secondary: #0F52BA; /* 科技蓝色 */
            --accent: #00F0FF; /* 青亮辅助色 */
            --bg-light: #FAFAFC;
            --bg-white: #FFFFFF;
            --text-dark: #1F2937;
            --text-muted: #4B5563;
            --border-color: #E5E7EB;
            --container-width: 1200px;
        }

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

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

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

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

        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

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

        .section-title h2 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-dark);
            position: relative;
            display: inline-block;
            padding-bottom: 10px;
        }

        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 2px;
        }

        /* 顶部导航 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            z-index: 1000;
            border-bottom: 2px solid var(--primary);
        }

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

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

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

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

        .nav-menu a {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-muted);
            padding: 5px 10px;
            border-radius: 4px;
        }

        .nav-menu a:hover {
            color: var(--primary);
            background: rgba(255, 94, 0, 0.08);
        }

        .nav-btn {
            background: var(--secondary);
            color: #fff !important;
            padding: 8px 16px !important;
            border-radius: 20px;
            font-weight: bold;
        }

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

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
        }

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background: var(--text-dark);
            border-radius: 2px;
        }

        /* Hero 首屏 - 严格限制无图 */
        .hero {
            padding-top: 150px;
            padding-bottom: 90px;
            background: radial-gradient(circle at 80% 20%, rgba(255, 94, 0, 0.08) 0%, rgba(15, 82, 186, 0.05) 50%, rgba(255, 255, 255, 1) 100%);
            text-align: center;
            border-bottom: 3px solid var(--secondary);
        }

        .hero h1 {
            font-size: 2.5rem;
            font-weight: 900;
            line-height: 1.3;
            letter-spacing: -0.5px;
            margin-bottom: 20px;
            color: var(--text-dark);
        }

        .hero h1 span {
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 40px auto;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .btn-main {
            background: linear-gradient(135deg, var(--primary) 0%, #FF8A00 100%);
            color: #fff;
            padding: 16px 36px;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: bold;
            box-shadow: 0 4px 15px rgba(255, 94, 0, 0.4);
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-main:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(255, 94, 0, 0.6);
        }

        .btn-sub {
            background: var(--text-dark);
            color: #fff;
            padding: 16px 36px;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: bold;
            transition: all 0.3s ease;
        }

        .btn-sub:hover {
            background: var(--secondary);
            transform: translateY(-3px);
        }

        /* 关于我们与数据卡片 */
        .about-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.8rem;
            color: var(--text-dark);
            margin-bottom: 20px;
        }

        .about-text p {
            color: var(--text-muted);
            margin-bottom: 15px;
            font-size: 1.05rem;
        }

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

        .stat-card {
            background: var(--bg-white);
            border: 2px solid var(--border-color);
            padding: 25px;
            border-radius: 12px;
            text-align: center;
            transition: all 0.3s ease;
        }

        .stat-card:hover {
            border-color: var(--primary);
            box-shadow: 0 8px 24px rgba(255, 94, 0, 0.1);
            transform: translateY(-5px);
        }

        .stat-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 5px;
        }

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

        /* 软件与平台介绍 */
        .platform-intro {
            background: #fff;
        }

        .intro-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .feature-card {
            padding: 30px;
            background: var(--bg-light);
            border-radius: 16px;
            border-top: 4px solid var(--secondary);
            transition: all 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            border-top-color: var(--primary);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
        }

        .feature-icon {
            font-size: 2rem;
            margin-bottom: 15px;
            display: inline-block;
        }

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

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

        /* 服务体系标签云与大模型 */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin-top: 30px;
        }

        .tag-item {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-dark);
            transition: all 0.3s;
        }

        .tag-item:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: scale(1.05);
        }

        .tag-highlight {
            border-color: var(--secondary);
            background: rgba(15, 82, 186, 0.05);
            color: var(--secondary);
        }

        /* 工作流步骤与标准化流程 */
        .workflow-timeline {
            position: relative;
            max-width: 900px;
            margin: 0 auto;
        }

        .timeline-item {
            display: flex;
            margin-bottom: 40px;
            position: relative;
        }

        .timeline-number {
            width: 50px;
            height: 50px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2rem;
            flex-shrink: 0;
            box-shadow: 0 4px 10px rgba(255, 94, 0, 0.3);
        }

        .timeline-content {
            margin-left: 25px;
            background: #fff;
            padding: 25px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            width: 100%;
        }

        .timeline-content h3 {
            margin-bottom: 8px;
            color: var(--text-dark);
        }

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

        /* 对比评测表格 */
        .comparison-table-wrapper {
            overflow-x: auto;
            margin-top: 30px;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            background: #fff;
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 700px;
        }

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

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

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

        .comparison-table .highlight-row {
            background-color: rgba(255, 94, 0, 0.03);
        }

        .comparison-table .highlight-cell {
            color: var(--primary);
            font-weight: 700;
        }

        .badge-star {
            background: var(--primary);
            color: #fff;
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: bold;
        }

        /* 案例中心：包含限定图片 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 30px;
            margin-top: 30px;
        }

        .case-card {
            background: #fff;
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 30px rgba(0,0,0,0.08);
            border-color: var(--secondary);
        }

        .case-img-container {
            position: relative;
            width: 100%;
            height: 200px;
            background: #eaeaea;
            overflow: hidden;
        }

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

        .case-info {
            padding: 24px;
        }

        .case-tag {
            display: inline-block;
            background: rgba(15, 82, 186, 0.1);
            color: var(--secondary);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 20px;
            margin-bottom: 12px;
        }

        .case-info h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
            color: var(--text-dark);
        }

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

        /* Token 比价 */
        .token-pricing {
            background: var(--bg-white);
        }

        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }

        .price-card {
            border: 2px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s;
            position: relative;
            background: var(--bg-light);
        }

        .price-card.popular {
            border-color: var(--primary);
            background: #fff;
        }

        .price-card.popular::before {
            content: "全网低价首选";
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--primary);
            color: #fff;
            padding: 4px 15px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: bold;
        }

        .price-model {
            font-size: 1.25rem;
            font-weight: 800;
            margin-bottom: 15px;
        }

        .price-num {
            font-size: 2rem;
            font-weight: 900;
            color: var(--secondary);
            margin-bottom: 10px;
        }

        .price-num span {
            font-size: 0.9rem;
            font-weight: normal;
            color: var(--text-muted);
        }

        .price-features {
            list-style: none;
            margin: 20px 0;
            padding-top: 20px;
            border-top: 1px solid var(--border-color);
        }

        .price-features li {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }

        /* 培训中心 */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .train-card {
            background: #fff;
            border: 1px solid var(--border-color);
            padding: 24px;
            border-radius: 12px;
            border-left: 6px solid var(--primary);
        }

        .train-card h4 {
            font-size: 1.05rem;
            margin-bottom: 10px;
            color: var(--text-dark);
        }

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

        /* 用户评论 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin-top: 30px;
        }

        .review-card {
            background: #fff;
            border: 1px solid var(--border-color);
            padding: 25px;
            border-radius: 16px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
        }

        .review-text {
            font-style: italic;
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 0.95rem;
        }

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

        .author-avatar {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1rem;
        }

        .author-info h4 {
            font-size: 0.95rem;
            margin-bottom: 2px;
        }

        .author-info p {
            font-size: 0.8rem;
            color: var(--primary);
            font-weight: 600;
        }

        /* 知识库/资讯 */
        .articles-box {
            background: var(--bg-light);
            border-radius: 16px;
            padding: 35px;
            border: 1px solid var(--border-color);
        }

        .article-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .article-item {
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            border-left: 4px solid var(--secondary);
            transition: all 0.3s;
        }

        .article-item:hover {
            border-left-color: var(--primary);
            transform: translateX(5px);
        }

        .article-item a {
            font-weight: 600;
            color: var(--text-dark);
            display: block;
            margin-bottom: 8px;
        }

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

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

        /* FAQ折叠面板 */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border-color);
            margin-bottom: 12px;
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .faq-question {
            padding: 20px 24px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            color: var(--text-dark);
        }

        .faq-question::after {
            content: "+";
            font-size: 1.5rem;
            color: var(--primary);
            transition: transform 0.3s ease;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 0.95rem;
            transition: all 0.3s ease;
            border-top: 0px solid transparent;
        }

        .faq-item.active {
            border-color: var(--primary);
            box-shadow: 0 4px 15px rgba(255, 94, 0, 0.05);
        }

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

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding-top: 15px;
            padding-bottom: 20px;
            border-top: 1px solid var(--border-color);
        }

        /* 表单区域 */
        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: flex-start;
        }

        .form-wrapper {
            background: #fff;
            padding: 40px;
            border-radius: 20px;
            border: 1px solid var(--border-color);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
        }

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

        .contact-form label {
            display: block;
            font-weight: 700;
            margin-bottom: 8px;
            font-size: 0.9rem;
            color: var(--text-dark);
        }

        .contact-form input,
        .contact-form select,
        .contact-form textarea {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.3s;
        }

        .contact-form input:focus,
        .contact-form select:focus,
        .contact-form textarea:focus {
            border-color: var(--primary);
        }

        .contact-info-panel {
            background: linear-gradient(135deg, var(--secondary) 0%, #082E6E 100%);
            color: #fff;
            padding: 40px;
            border-radius: 20px;
        }

        .contact-info-panel h3 {
            font-size: 1.6rem;
            margin-bottom: 20px;
            color: var(--accent);
        }

        .contact-list {
            list-style: none;
            margin-bottom: 30px;
        }

        .contact-list li {
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1rem;
        }

        .qr-codes {
            display: flex;
            gap: 25px;
            margin-top: 30px;
        }

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

        .qr-item img {
            width: 120px;
            height: 120px;
            border-radius: 8px;
            border: 4px solid rgba(255,255,255,0.2);
            background: #fff;
        }

        .qr-item p {
            margin-top: 8px;
            font-size: 0.85rem;
            font-weight: bold;
        }

        /* 友情链接与页脚 */
        footer {
            background: #111827;
            color: #F9FAFB;
            padding: 50px 0 20px 0;
            font-size: 0.9rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr;
            gap: 40px;
            padding-bottom: 30px;
            border-bottom: 1px solid #374151;
        }

        .friend-links {
            margin-top: 15px;
        }

        .friend-links a {
            display: inline-block;
            margin-right: 15px;
            margin-bottom: 10px;
            color: #9CA3AF;
            text-decoration: underline;
        }

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

        .footer-copyright {
            text-align: center;
            padding-top: 20px;
            color: #9CA3AF;
            font-size: 0.8rem;
        }

        /* 浮动客服 */
        .floating-kefu {
            position: fixed;
            right: 25px;
            bottom: 25px;
            z-index: 999;
            background: var(--primary);
            color: #fff;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 20px rgba(255, 94, 0, 0.4);
            cursor: pointer;
            font-weight: bold;
            font-size: 0.8rem;
            text-align: center;
            line-height: 1.2;
            transition: all 0.3s;
        }

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

        .kefu-popup {
            position: fixed;
            right: 95px;
            bottom: 25px;
            background: #fff;
            border: 2px solid var(--primary);
            border-radius: 12px;
            padding: 15px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            z-index: 1000;
            display: none;
            text-align: center;
        }

        .kefu-popup img {
            width: 140px;
            height: 140px;
        }

        .kefu-popup p {
            color: var(--text-dark);
            font-size: 0.85rem;
            font-weight: bold;
            margin-top: 5px;
        }

        /* 移动端响应式 */
        @media (max-width: 991px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: #fff;
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
                padding: 20px;
                border-bottom: 2px solid var(--secondary);
            }

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

            .menu-toggle {
                display: flex;
            }

            .about-grid, .form-grid {
                grid-template-columns: 1fr;
            }

            .article-list {
                grid-template-columns: 1fr;
            }
        }