:root {
            --primary: #E53E3E;
            --primary-hover: #C53030;
            --primary-light: #FFF5F5;
            --dark: #1A202C;
            --gray-text: #4A5568;
            --light-bg: #F7FAFC;
            --border-color: #E2E8F0;
            --white: #FFFFFF;
            --transition: all 0.3s ease;
        }

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

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

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

        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }

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

        /* 头部导航 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: 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: 1px solid var(--border-color);
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }

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

        .brand-name {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
        }

        .nav-menu {
            display: flex;
            gap: 20px;
            align-items: center;
        }

        .nav-link {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--gray-text);
        }

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

        .nav-btn {
            background-color: var(--primary);
            color: var(--white);
            padding: 8px 20px;
            border-radius: 6px;
            font-weight: 600;
            font-size: 0.9rem;
        }

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

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

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--dark);
            transition: var(--transition);
        }

        /* 移动端侧栏 */
        .mobile-nav {
            position: fixed;
            top: 70px;
            left: -100%;
            width: 100%;
            height: calc(100vh - 70px);
            background-color: var(--white);
            z-index: 999;
            transition: var(--transition);
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
            display: flex;
            flex-direction: column;
            padding: 40px 20px;
            gap: 20px;
        }

        .mobile-nav.active {
            left: 0;
        }

        /* 首屏 Hero - 无图片设计，采用艳红渐变与几何纹理 */
        .hero {
            padding-top: 150px;
            padding-bottom: 100px;
            background: linear-gradient(135deg, #7B0000 0%, #D32F2F 50%, #FF5252 100%);
            color: var(--white);
            position: relative;
            overflow: hidden;
            text-align: center;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
                        linear-gradient(rgba(0, 0, 0, 0.2) 1px, transparent 1px),
                        linear-gradient(90deg, rgba(0, 0, 0, 0.2) 1px, transparent 1px);
            background-size: 100% 100%, 40px 40px, 40px 40px;
            opacity: 0.3;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
        }

        h1.hero-title {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 20px;
            text-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }

        .hero-desc {
            font-size: 1.2rem;
            opacity: 0.9;
            margin-bottom: 40px;
            line-height: 1.6;
        }

        .hero-btn-group {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
        }

        .btn-main {
            background-color: var(--white);
            color: var(--primary-hover);
            padding: 12px 30px;
            border-radius: 8px;
            font-weight: 700;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
        }

        .btn-main:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0,0,0,0.25);
        }

        .btn-sub {
            background-color: rgba(255, 255, 255, 0.2);
            color: var(--white);
            border: 1px solid rgba(255, 255, 255, 0.4);
            padding: 12px 30px;
            border-radius: 8px;
            font-weight: 700;
            backdrop-filter: blur(5px);
        }

        .btn-sub:hover {
            background-color: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }

        /* 核心指标卡片 */
        .stats-section {
            background-color: var(--white);
            padding: 60px 0;
            margin-top: -40px;
            position: relative;
            z-index: 10;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
        }

        .stat-card {
            background-color: var(--white);
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            border-top: 4px solid var(--primary);
            text-align: center;
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
        }

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

        .stat-label {
            font-size: 0.95rem;
            color: var(--gray-text);
        }

        /* 通用区块样式 */
        .section {
            padding: 80px 0;
        }

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

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

        .section-header h2 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--dark);
            position: relative;
            display: inline-block;
            padding-bottom: 15px;
        }

        .section-header h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background-color: var(--primary);
            border-radius: 2px;
        }

        .section-header p {
            color: var(--gray-text);
            margin-top: 15px;
            font-size: 1.05rem;
        }

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

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

        .about-text p {
            color: var(--gray-text);
            margin-bottom: 20px;
            font-size: 1rem;
        }

        .about-image img {
            width: 100%;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        /* AIGC 服务与模型聚合 */
        .service-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .service-card {
            background-color: var(--white);
            padding: 30px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .service-card:hover {
            box-shadow: 0 15px 35px rgba(229, 62, 62, 0.1);
            border-color: var(--primary);
            transform: translateY(-5px);
        }

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

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

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

        /* 模型标签云 */
        .tag-cloud-wrapper {
            margin-top: 40px;
            background-color: var(--white);
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.02);
            border: 1px solid var(--border-color);
        }

        .tag-cloud-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 20px;
            text-align: center;
            color: var(--primary);
        }

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

        .tag-item {
            background-color: var(--primary-light);
            color: var(--primary);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            border: 1px solid rgba(229, 62, 62, 0.2);
            transition: var(--transition);
        }

        .tag-item:hover {
            background-color: var(--primary);
            color: var(--white);
        }

        /* 制作场景与解决方案 */
        .scene-tabs {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }

        .tab-btn {
            background-color: var(--white);
            border: 1px solid var(--border-color);
            padding: 10px 24px;
            border-radius: 25px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }

        .tab-btn.active, .tab-btn:hover {
            background-color: var(--primary);
            color: var(--white);
            border-color: var(--primary);
        }

        .tab-content {
            display: none;
            background-color: var(--white);
            padding: 30px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
        }

        .tab-content.active {
            display: block;
        }

        .scene-detail-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 30px;
            align-items: center;
        }

        /* 流程步骤与时间线 */
        .process-flow {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            position: relative;
        }

        .process-step {
            background-color: var(--white);
            padding: 30px 20px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
        }

        .step-num {
            width: 40px;
            height: 40px;
            background-color: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px auto;
            font-weight: 800;
        }

        .process-step h4 {
            margin-bottom: 10px;
            font-size: 1.1rem;
        }

        .process-step p {
            font-size: 0.9rem;
            color: var(--gray-text);
        }

        /* 对比评测表格 */
        .table-responsive {
            overflow-x: auto;
            margin-top: 30px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            background-color: var(--white);
        }

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

        .comparison-table th, .comparison-table td {
            padding: 15px 20px;
            border-bottom: 1px solid var(--border-color);
        }

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

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

        .highlight-cell {
            background-color: rgba(229, 62, 62, 0.05);
            font-weight: 700;
            color: var(--primary);
        }

        .score-badge {
            display: inline-block;
            background-color: var(--primary);
            color: var(--white);
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 0.85rem;
            font-weight: 700;
        }

        /* 案例展示 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

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

        .case-image {
            height: 200px;
            overflow: hidden;
            background-color: #eee;
            position: relative;
        }

        .case-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .case-card:hover .case-image img {
            transform: scale(1.05);
        }

        .case-info {
            padding: 20px;
        }

        .case-info h4 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }

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

        /* 培训计划 */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .training-card {
            background-color: var(--white);
            padding: 30px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            position: relative;
        }

        .training-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background-color: var(--primary);
            color: var(--white);
            font-size: 0.75rem;
            padding: 3px 8px;
            border-radius: 3px;
        }

        /* 价格与 Token 参考 */
        .price-section {
            background-color: var(--light-bg);
        }

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

        .price-card {
            background-color: var(--white);
            padding: 40px 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            text-align: center;
            transition: var(--transition);
        }

        .price-card.featured {
            border: 2px solid var(--primary);
            transform: scale(1.03);
            box-shadow: 0 15px 35px rgba(229, 62, 62, 0.1);
        }

        .price-card h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
        }

        .price-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 20px;
        }

        .price-num span {
            font-size: 1rem;
            color: var(--gray-text);
            font-weight: normal;
        }

        .price-features {
            list-style: none;
            margin-bottom: 30px;
            text-align: left;
        }

        .price-features li {
            padding: 10px 0;
            border-bottom: 1px solid var(--light-bg);
            font-size: 0.95rem;
            color: var(--gray-text);
        }

        /* 评论模块 */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }

        .testimonial-card {
            background-color: var(--white);
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.02);
            border: 1px solid var(--border-color);
        }

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

        .user-avatar {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
        }

        .user-meta h4 {
            font-size: 1rem;
        }

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

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

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

        .faq-item {
            margin-bottom: 15px;
            background-color: var(--white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
        }

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

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

        .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;
            transition: max-height 0.3s ease-out;
            background-color: var(--light-bg);
        }

        .faq-answer p {
            padding: 20px;
            font-size: 0.95rem;
            color: var(--gray-text);
            border-top: 1px solid var(--border-color);
            line-height: 1.6;
        }

        /* AI术语与自助排查 */
        .info-tab-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }

        .info-box {
            background-color: var(--white);
            padding: 30px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
        }

        .info-box h3 {
            font-size: 1.3rem;
            color: var(--primary);
            margin-bottom: 20px;
            border-left: 4px solid var(--primary);
            padding-left: 15px;
        }

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

        .info-list li {
            padding: 12px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .info-list li:last-child {
            border-bottom: none;
        }

        .info-list strong {
            display: block;
            font-size: 0.95rem;
            margin-bottom: 4px;
        }

        .info-list p {
            font-size: 0.85rem;
            color: var(--gray-text);
        }

        /* 资讯与文章列表 */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .article-card {
            background-color: var(--white);
            padding: 25px;
            border-radius: 10px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .article-card:hover {
            border-color: var(--primary);
            transform: translateY(-3px);
        }

        .article-tag {
            background-color: var(--primary-light);
            color: var(--primary);
            font-size: 0.75rem;
            padding: 3px 8px;
            border-radius: 3px;
            display: inline-block;
            margin-bottom: 15px;
        }

        .article-card h4 {
            font-size: 1.1rem;
            margin-bottom: 10px;
        }

        .article-card p {
            color: var(--gray-text);
            font-size: 0.9rem;
            margin-bottom: 15px;
        }

        .article-link {
            color: var(--primary);
            font-weight: 700;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        /* 需求匹配与联系我们表单 */
        .contact-section {
            background-color: var(--light-bg);
        }

        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 40px;
        }

        .form-wrapper {
            background-color: var(--white);
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 0.95rem;
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            background-color: var(--light-bg);
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            background-color: var(--white);
            outline: none;
        }

        .form-btn {
            background-color: var(--primary);
            color: var(--white);
            border: none;
            width: 100%;
            padding: 14px;
            border-radius: 6px;
            font-size: 1.05rem;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
        }

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

        .contact-info-wrapper {
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .info-card {
            background-color: var(--white);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            margin-bottom: 20px;
        }

        .info-card h3 {
            font-size: 1.25rem;
            margin-bottom: 15px;
            color: var(--primary);
        }

        .info-item {
            display: flex;
            gap: 15px;
            margin-bottom: 15px;
            font-size: 0.95rem;
        }

        .qrcode-area {
            display: flex;
            gap: 20px;
            align-items: center;
            margin-top: 20px;
        }

        .qrcode-box {
            text-align: center;
        }

        .qrcode-box img {
            width: 120px;
            height: 120px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 5px;
            background-color: var(--white);
        }

        .qrcode-box p {
            font-size: 0.8rem;
            color: var(--gray-text);
            margin-top: 8px;
        }

        /* 浮动客服栏 */
        .sticky-kefu {
            position: fixed;
            right: 20px;
            bottom: 40px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .kefu-trigger {
            width: 50px;
            height: 50px;
            background-color: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
            cursor: pointer;
            transition: var(--transition);
        }

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

        .back-top {
            display: none;
        }

        /* 页脚 */
        footer {
            background-color: var(--dark);
            color: var(--white);
            padding: 60px 0 30px 0;
            font-size: 0.9rem;
        }

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

        .footer-logo-desc h3 {
            font-size: 1.4rem;
            color: var(--white);
            margin-bottom: 15px;
        }

        .footer-logo-desc p {
            opacity: 0.7;
            line-height: 1.6;
        }

        .footer-links h4 {
            font-size: 1.05rem;
            margin-bottom: 20px;
            position: relative;
        }

        .footer-links h4::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 30px;
            height: 2px;
            background-color: var(--primary);
        }

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

        .footer-links li {
            margin-bottom: 12px;
        }

        .footer-links a {
            opacity: 0.7;
        }

        .footer-links a:hover {
            opacity: 1;
            color: var(--primary);
            padding-left: 5px;
        }

        .friend-links {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            margin-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }

        .friend-links a {
            opacity: 0.6;
            font-size: 0.85rem;
        }

        .friend-links a:hover {
            opacity: 1;
            color: var(--primary);
        }

        .copyright-area {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 15px;
        }

        .copyright-area p {
            opacity: 0.5;
            font-size: 0.85rem;
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .about-grid, .contact-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            .menu-toggle {
                display: flex;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            h1.hero-title {
                font-size: 2rem;
            }
            .hero-desc {
                font-size: 1.05rem;
            }
            .info-tab-grid {
                grid-template-columns: 1fr;
            }
        }