:root {
            --primary: #FF5E00;
            --primary-hover: #E04F00;
            --primary-light: #FFF0E6;
            --secondary: #2A2B3D;
            --dark: #1E1E24;
            --text-main: #333333;
            --text-muted: #666666;
            --bg-light: #FAF9F6;
            --bg-white: #FFFFFF;
            --border-color: #EAEAEA;
            --transition: all 0.3s ease;
            --shadow: 0 10px 30px rgba(0,0,0,0.05);
            --shadow-hover: 0 15px 35px rgba(255, 94, 0, 0.15);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            width: 100%;
        }

        /* 顶部导航 */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.02);
        }

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

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

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

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

        .nav-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-main);
            padding: 5px 10px;
            border-radius: 4px;
        }

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

        .nav-btn {
            background-color: var(--primary);
            color: #fff !important;
            padding: 8px 18px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
        }

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

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

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

        /* Hero 首屏 - 亮橙科技感，禁止出现任何图片 */
        .hero-section {
            background: radial-gradient(circle at 80% 20%, #FFF5EE 0%, #FFFFFF 60%);
            padding: 100px 0 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -10%;
            left: -10%;
            width: 40%;
            height: 40%;
            background: radial-gradient(circle, rgba(255,94,0,0.05) 0%, transparent 70%);
            z-index: 1;
        }

        .hero-badge {
            display: inline-block;
            background-color: var(--primary-light);
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 30px;
            margin-bottom: 24px;
            border: 1px solid rgba(255, 94, 0, 0.2);
            animation: pulse 2s infinite;
        }

        .hero-h1 {
            font-size: 44px;
            font-weight: 800;
            color: var(--dark);
            line-height: 1.3;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .hero-h1 span {
            color: var(--primary);
            background: linear-gradient(135deg, #FF8C00, #FF3D00);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 35px auto;
        }

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

        .btn-main {
            background: linear-gradient(135deg, var(--primary), #FF3D00);
            color: #fff;
            padding: 14px 32px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 16px;
            box-shadow: 0 4px 15px rgba(255, 94, 0, 0.3);
            border: none;
            cursor: pointer;
        }

        .btn-main:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 94, 0, 0.4);
        }

        .btn-sub {
            background-color: var(--bg-white);
            color: var(--dark);
            border: 1px solid var(--border-color);
            padding: 14px 32px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 16px;
        }

        .btn-sub:hover {
            background-color: var(--primary-light);
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
        }

        /* 数据指标卡片 */
        .stats-section {
            padding: 50px 0;
            background-color: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
        }

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

        .stat-card {
            text-align: center;
            padding: 20px;
            border-right: 1px solid var(--border-color);
        }

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

        .stat-number {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 5px;
        }

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

        /* 通用区块设置 */
        .section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

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

        .section-tag {
            font-size: 12px;
            font-weight: 700;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 10px;
            display: block;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--dark);
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 10px auto 0 auto;
        }

        /* 关于我们 & 平台介绍 */
        .about-section {
            background-color: var(--bg-light);
        }

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

        .about-content h3 {
            font-size: 24px;
            color: var(--dark);
            margin-bottom: 20px;
            font-weight: 700;
        }

        .about-content p {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 15px;
        }

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

        .about-feat-item {
            background-color: var(--bg-white);
            padding: 15px;
            border-radius: 8px;
            border-left: 4px solid var(--primary);
            box-shadow: var(--shadow);
        }

        .about-feat-item h4 {
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 5px;
            color: var(--dark);
        }

        .about-feat-item p {
            font-size: 13px;
            margin: 0;
        }

        /* AIGC 服务能力卡片 */
        .services-section {
            background-color: var(--bg-white);
        }

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

        .service-card {
            background-color: var(--bg-light);
            border-radius: 12px;
            padding: 30px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

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

        .service-icon {
            font-size: 32px;
            color: var(--primary);
            margin-bottom: 20px;
        }

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

        .service-text {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .service-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 5px;
        }

        /* 一站式制作 - 平台集成标签墙 */
        .integration-section {
            background-color: var(--bg-light);
            text-align: center;
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            max-width: 1000px;
            margin: 0 auto;
        }

        .tag-item {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 14px;
            font-weight: 500;
            color: var(--dark);
            transition: var(--transition);
        }

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

        /* 行业解决方案 */
        .solutions-section {
            background-color: var(--bg-white);
        }

        .solution-card {
            background-color: var(--bg-light);
            border-radius: 12px;
            padding: 30px;
            border: 1px solid var(--border-color);
        }

        .solution-list {
            list-style: none;
            margin-top: 15px;
        }

        .solution-list li {
            font-size: 14px;
            color: var(--text-muted);
            padding-left: 20px;
            position: relative;
            margin-bottom: 8px;
        }

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

        /* 全国服务网络 */
        .network-section {
            background-color: var(--bg-light);
        }

        .network-grid {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 40px;
            align-items: center;
        }

        .network-info {
            padding-right: 20px;
        }

        .network-list {
            margin-top: 20px;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .network-item {
            display: flex;
            align-items: center;
            gap: 15px;
            background-color: var(--bg-white);
            padding: 15px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
        }

        .network-city {
            font-weight: 700;
            color: var(--primary);
            min-width: 60px;
        }

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

        /* 标准化流程 */
        .process-section {
            background-color: var(--bg-white);
        }

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

        .step-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            text-align: center;
            position: relative;
            z-index: 2;
            transition: var(--transition);
        }

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

        .step-num {
            width: 40px;
            height: 40px;
            background-color: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px auto;
            font-weight: 700;
        }

        .step-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--dark);
        }

        .step-desc {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 客户案例中心 - 非首屏可使用图片 */
        .cases-section {
            background-color: var(--bg-light);
        }

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

        .case-card {
            background-color: var(--bg-white);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }

        .case-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16/10;
            background-color: #eee;
        }

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

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

        .case-info {
            padding: 20px;
        }

        .case-tag {
            font-size: 11px;
            background-color: var(--primary-light);
            color: var(--primary);
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 10px;
        }

        .case-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 8px;
        }

        .case-desc {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 对比评测 - 突出平台优势 */
        .evaluation-section {
            background-color: var(--bg-white);
        }

        .evaluation-layout {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 40px;
            align-items: center;
        }

        .score-box {
            background-color: var(--primary-light);
            border: 1px solid rgba(255, 94, 0, 0.2);
            border-radius: 16px;
            padding: 40px;
            text-align: center;
        }

        .stars {
            font-size: 28px;
            color: var(--primary);
            margin-bottom: 15px;
        }

        .score-num {
            font-size: 64px;
            font-weight: 900;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 10px;
        }

        .score-total {
            font-size: 16px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .score-label {
            font-size: 18px;
            font-weight: 700;
            color: var(--dark);
        }

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

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 14px;
        }

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

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

        .compare-table tr:hover td {
            background-color: var(--primary-light);
        }

        /* Token 比价 */
        .token-section {
            background-color: var(--bg-light);
        }

        .token-calc-box {
            background-color: var(--bg-white);
            border-radius: 12px;
            padding: 30px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
            max-width: 800px;
            margin: 0 auto;
        }

        .calc-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        .calc-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .calc-group label {
            font-size: 14px;
            font-weight: 600;
            color: var(--dark);
        }

        .calc-group select, .calc-group input {
            padding: 10px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            outline: none;
            transition: var(--transition);
        }

        .calc-group select:focus, .calc-group input:focus {
            border-color: var(--primary);
        }

        .calc-result {
            background-color: var(--primary-light);
            padding: 20px;
            border-radius: 8px;
            text-align: center;
            border: 1px dashed var(--primary);
        }

        .calc-price {
            font-size: 28px;
            font-weight: 800;
            color: var(--primary);
        }

        /* 人工智能与职业技术培训 */
        .training-section {
            background-color: var(--bg-white);
        }

        .training-card {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            transition: var(--transition);
        }

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

        .training-badge {
            background-color: var(--primary);
            color: #fff;
            font-size: 12px;
            padding: 4px 10px;
            border-radius: 4px;
            display: inline-block;
            margin-bottom: 15px;
        }

        .training-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--dark);
        }

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

        /* 智能需求匹配 (表单) */
        .form-section {
            background-color: var(--bg-light);
        }

        .form-wrapper {
            background-color: var(--bg-white);
            border-radius: 16px;
            padding: 40px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow);
            max-width: 700px;
            margin: 0 auto;
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .form-group.full-width {
            grid-column: span 2;
        }

        .form-group label {
            font-size: 14px;
            font-weight: 600;
            color: var(--dark);
        }

        .form-control {
            padding: 12px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            outline: none;
            transition: var(--transition);
            font-size: 14px;
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(255, 94, 0, 0.1);
        }

        .form-submit-btn {
            background-color: var(--primary);
            color: #fff;
            border: none;
            padding: 14px;
            border-radius: 6px;
            font-weight: 700;
            font-size: 16px;
            cursor: pointer;
            width: 100%;
            transition: var(--transition);
        }

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

        /* FAQ折叠面板 */
        .faq-section {
            background-color: var(--bg-white);
        }

        .faq-wrapper {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 15px 0;
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 700;
            font-size: 16px;
            color: var(--dark);
            padding: 10px 0;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
            font-size: 14px;
            color: var(--text-muted);
            padding-top: 0;
        }

        .faq-item.active .faq-answer {
            max-height: 500px;
            padding-top: 10px;
            transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
        }

        .faq-icon::before {
            content: "+";
            font-size: 20px;
            color: var(--primary);
            font-weight: bold;
        }

        .faq-item.active .faq-icon::before {
            content: "-";
        }

        /* AI 术语百科 */
        .encyclopedia-section {
            background-color: var(--bg-light);
        }

        /* 资讯 & 最新文章 */
        .news-section {
            background-color: var(--bg-white);
        }

        .news-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 15px;
            max-width: 800px;
            margin: 0 auto;
        }

        .news-item {
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 20px;
            border-radius: 8px;
            transition: var(--transition);
        }

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

        .news-link {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 700;
            color: var(--dark);
        }

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

        .news-date {
            font-size: 12px;
            color: var(--text-muted);
            font-weight: normal;
        }

        /* 客户评论卡片 */
        .reviews-section {
            background-color: var(--bg-light);
        }

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

        .review-text {
            font-size: 14px;
            color: var(--text-muted);
            font-style: italic;
            margin-bottom: 20px;
            position: relative;
        }

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

        .review-avatar {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            background-color: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-weight: 700;
        }

        .review-info h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--dark);
        }

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

        /* 加盟代理 */
        .agent-section {
            background: linear-gradient(135deg, var(--secondary) 0%, #171822 100%);
            color: #fff;
            text-align: center;
            padding: 80px 0;
        }

        .agent-section .section-title {
            color: #fff;
        }

        .agent-section .section-desc {
            color: #ccc;
        }

        .agent-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-top: 50px;
            margin-bottom: 40px;
        }

        .agent-card {
            background-color: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            padding: 30px;
            transition: var(--transition);
        }

        .agent-card:hover {
            transform: translateY(-5px);
            background-color: rgba(255, 255, 255, 0.08);
            border-color: var(--primary);
        }

        .agent-icon {
            font-size: 32px;
            color: var(--primary);
            margin-bottom: 15px;
        }

        /* 页脚 */
        footer {
            background-color: var(--secondary);
            color: #B5B5C3;
            padding: 60px 0 30px 0;
            font-size: 14px;
            border-top: 1px solid rgba(255,255,255,0.05);
        }

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

        .footer-logo {
            margin-bottom: 20px;
        }

        .footer-title {
            color: #fff;
            font-weight: 700;
            font-size: 16px;
            margin-bottom: 20px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

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

        .footer-qrcode {
            display: flex;
            gap: 20px;
            align-items: center;
        }

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

        .qrcode-item img {
            width: 90px;
            height: 90px;
            border-radius: 4px;
            margin-bottom: 8px;
        }

        .qrcode-item span {
            font-size: 12px;
            display: block;
        }

        .friend-links {
            border-top: 1px solid rgba(255,255,255,0.05);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            font-size: 12px;
        }

        .friend-links a {
            color: #B5B5C3;
        }

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

        .copyright-bar {
            border-top: 1px solid rgba(255,255,255,0.05);
            padding-top: 20px;
            margin-top: 20px;
            text-align: center;
            font-size: 12px;
        }

        /* 浮动客服 */
        .floating-contact {
            position: fixed;
            right: 20px;
            bottom: 80px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            background-color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 10px rgba(0,0,0,0.15);
            color: #fff;
            font-size: 20px;
            cursor: pointer;
            position: relative;
            transition: var(--transition);
        }

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

        .float-btn .tooltip-qr {
            position: absolute;
            right: 60px;
            bottom: 0;
            background-color: #fff;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 5px 25px rgba(0,0,0,0.15);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            width: 150px;
            text-align: center;
            color: #333;
        }

        .float-btn .tooltip-qr img {
            width: 120px;
            height: 120px;
            margin: 0 auto 5px auto;
        }

        .float-btn .tooltip-qr span {
            font-size: 12px;
            font-weight: bold;
        }

        .float-btn:hover .tooltip-qr {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top {
            display: none;
            background-color: var(--secondary);
        }

        /* 动画效果 */
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        /* 响应式媒体查询 */
        @media (max-width: 992px) {
            .grid-3col {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-card {
                border-right: none;
                border-bottom: 1px solid var(--border-color);
            }
            .about-grid {
                grid-template-columns: 1fr;
            }
            .network-grid {
                grid-template-columns: 1fr;
            }
            .evaluation-layout {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .hero-h1 {
                font-size: 32px;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: #fff;
                border-bottom: 1px solid var(--border-color);
                padding: 20px;
                gap: 15px;
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }
            .nav-menu.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .grid-3col {
                grid-template-columns: 1fr;
            }
            .steps-container {
                grid-template-columns: 1fr;
            }
            .case-grid {
                grid-template-columns: 1fr;
            }
            .calc-grid {
                grid-template-columns: 1fr;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group.full-width {
                grid-column: span 1;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .agent-grid {
                grid-template-columns: 1fr;
            }
        }