:root {
            --primary-color: #2ecc71; /* 薄荷春绿 */
            --primary-hover: #27ae60;
            --primary-light: #e8f8f5;
            --accent-color: #1abc9c;
            --dark-color: #2c3e50;
            --text-color: #34495e;
            --text-muted: #7f8c8d;
            --bg-light: #f9fbf9;
            --bg-white: #ffffff;
            --border-color: #e2e8f0;
            --shadow-sm: 0 2px 8px rgba(46, 204, 113, 0.08);
            --shadow-md: 0 8px 24px rgba(46, 204, 113, 0.12);
            --max-width: 1200px;
        }

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

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

        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }

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

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

        /* 顶部导航 */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-sm);
        }

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

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

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

        .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: var(--dark-color);
            letter-spacing: 0.5px;
        }

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

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

        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--dark-color);
            padding: 5px 10px;
            border-radius: 4px;
            transition: all 0.3s ease;
        }

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

        .btn-register {
            background-color: var(--primary-color);
            color: white;
            padding: 8px 18px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 14px;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-register:hover {
            background-color: var(--primary-hover);
            box-shadow: 0 4px 12px rgba(46, 204, 113, 0.3);
            color: white;
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--dark-color);
            font-size: 24px;
            cursor: pointer;
        }

        /* 模块基础样式 */
        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

        section:nth-child(even) {
            background-color: var(--bg-white);
        }

        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 50px;
        }

        .section-tag {
            display: inline-block;
            background-color: var(--primary-light);
            color: var(--primary-color);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 30px;
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .section-title {
            font-size: 32px;
            color: var(--dark-color);
            margin-bottom: 15px;
            font-weight: 700;
        }

        .section-subtitle {
            color: var(--text-muted);
            font-size: 16px;
        }

        /* 1. 首页 (Hero) - 无图片设计 */
        .hero {
            background: linear-gradient(135deg, #eafaf1 0%, #f4fbf7 50%, #ffffff 100%);
            padding: 100px 0 80px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -10%;
            left: -10%;
            width: 40%;
            height: 60%;
            background: radial-gradient(circle, rgba(46,204,113,0.1) 0%, transparent 70%);
            z-index: 1;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -10%;
            right: -10%;
            width: 50%;
            height: 60%;
            background: radial-gradient(circle, rgba(26,188,156,0.1) 0%, transparent 70%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 850px;
            margin: 0 auto;
        }

        .hero-title {
            font-size: 42px;
            color: var(--dark-color);
            line-height: 1.25;
            margin-bottom: 24px;
            font-weight: 800;
        }

        .hero-title span {
            color: var(--primary-color);
            position: relative;
            display: inline-block;
        }

        .hero-desc {
            font-size: 18px;
            color: var(--text-color);
            margin-bottom: 35px;
            line-height: 1.8;
        }

        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 50px;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: white;
            padding: 14px 32px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: 600;
            box-shadow: 0 4px 15px rgba(46, 204, 113, 0.3);
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(46, 204, 113, 0.4);
            color: white;
        }

        .btn-secondary {
            background-color: white;
            color: var(--dark-color);
            border: 1px solid var(--border-color);
            padding: 14px 32px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .btn-secondary:hover {
            background-color: var(--bg-light);
            border-color: var(--text-muted);
            color: var(--dark-color);
        }

        /* 数据指标卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 20px;
        }

        .stat-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 24px 15px;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

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

        .stat-value {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 6px;
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 2. 关于我们 */
        .about-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 24px;
            color: var(--dark-color);
            margin-bottom: 15px;
        }

        .about-text p {
            color: var(--text-color);
            font-size: 15px;
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .about-features {
            list-style: none;
        }

        .about-features li {
            position: relative;
            padding-left: 25px;
            margin-bottom: 12px;
            font-weight: 500;
        }

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

        .about-brand-card {
            background-color: var(--primary-light);
            border-radius: 16px;
            padding: 40px;
            border: 1px solid rgba(46, 204, 113, 0.2);
            text-align: center;
        }

        .about-brand-card h4 {
            font-size: 20px;
            color: var(--dark-color);
            margin-bottom: 15px;
        }

        /* 3. 全平台AIGC服务体系 */
        .service-tags-wrapper {
            margin-bottom: 40px;
        }

        .tags-title {
            font-size: 18px;
            color: var(--dark-color);
            text-align: center;
            margin-bottom: 20px;
            font-weight: 600;
        }

        .model-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
            max-width: 900px;
            margin: 0 auto;
        }

        .model-tag {
            background: white;
            border: 1px solid var(--border-color);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 13px;
            color: var(--text-color);
            transition: all 0.3s ease;
        }

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

        .platform-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .platform-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

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

        .platform-icon {
            font-size: 36px;
            color: var(--primary-color);
            margin-bottom: 20px;
        }

        .platform-card h4 {
            font-size: 18px;
            color: var(--dark-color);
            margin-bottom: 12px;
        }

        .platform-card p {
            font-size: 14px;
            color: var(--text-muted);
        }

        /* 4. 全自动AIGC制作流程 */
        .process-flow {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .process-step {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px 20px;
            text-align: center;
            position: relative;
        }

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

        .process-step h4 {
            font-size: 16px;
            color: var(--dark-color);
            margin-bottom: 10px;
        }

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

        /* 5. 全行业解决方案 */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .solution-card {
            background: white;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            box-shadow: var(--shadow-sm);
        }

        .solution-img-holder {
            background: var(--primary-light);
            height: 200px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }

        .solution-img-holder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .solution-info {
            padding: 30px;
        }

        .solution-info h4 {
            font-size: 20px;
            color: var(--dark-color);
            margin-bottom: 12px;
        }

        .solution-info p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 15px;
        }

        /* 6. 全国服务网络 */
        .network-section {
            background-color: var(--bg-white);
        }

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

        .network-map-placeholder {
            background: radial-gradient(circle, #eafaf1 0%, #f4fbf7 80%);
            border-radius: 12px;
            padding: 40px;
            border: 1px solid var(--border-color);
            text-align: center;
            font-weight: 500;
        }

        .network-nodes {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .network-node {
            background: var(--bg-light);
            padding: 15px;
            border-radius: 8px;
            border-left: 4px solid var(--primary-color);
            font-size: 14px;
        }

        /* 7. 标准化服务全流程 */
        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
            padding-left: 30px;
            border-left: 2px solid var(--primary-light);
        }

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

        .timeline-item::before {
            content: '';
            position: absolute;
            left: -37px;
            top: 5px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary-color);
            border: 2px solid white;
        }

        .timeline-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 8px;
        }

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

        /* 8. 技术标准 */
        .tech-standards {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .tech-card {
            background: white;
            border: 1px solid var(--border-color);
            padding: 25px;
            border-radius: 12px;
            box-shadow: var(--shadow-sm);
        }

        .tech-card h4 {
            color: var(--dark-color);
            font-size: 16px;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .tech-card h4::before {
            content: "◆";
            color: var(--primary-color);
        }

        .tech-card p {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 9. 客户案例中心 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

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

        .case-image {
            height: 240px;
            overflow: hidden;
            background: #eee;
        }

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

        .case-content {
            padding: 24px;
        }

        .case-tag {
            color: var(--primary-color);
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            margin-bottom: 8px;
            display: inline-block;
        }

        .case-content h4 {
            font-size: 18px;
            color: var(--dark-color);
            margin-bottom: 10px;
        }

        .case-content p {
            font-size: 14px;
            color: var(--text-muted);
        }

        /* 10. 对比评测 */
        .evaluation-box {
            background: white;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            padding: 40px;
            box-shadow: var(--shadow-md);
            margin-bottom: 40px;
        }

        .eval-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 20px;
            margin-bottom: 30px;
            flex-wrap: wrap;
            gap: 15px;
        }

        .eval-title-area h3 {
            font-size: 22px;
            color: var(--dark-color);
        }

        .eval-score-area {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .eval-stars {
            color: #f1c40f;
            font-size: 20px;
        }

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

        .eval-table-wrapper {
            overflow-x: auto;
        }

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

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

        .eval-table th {
            background-color: var(--bg-light);
            color: var(--dark-color);
            font-weight: 600;
        }

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

        /* 11. 智能需求匹配与联系我们表单 */
        .form-section {
            background-color: var(--bg-light);
        }

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

        .form-info h3 {
            font-size: 26px;
            color: var(--dark-color);
            margin-bottom: 20px;
        }

        .form-info p {
            font-size: 15px;
            color: var(--text-color);
            margin-bottom: 30px;
        }

        .contact-methods {
            list-style: none;
        }

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

        .contact-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary-color);
            display: flex;
            align-items: center;
            justify-content: justify-center;
            font-weight: 700;
            justify-content: center;
        }

        .contact-detail h5 {
            font-size: 14px;
            color: var(--dark-color);
        }

        .contact-detail p {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        .contact-form {
            background: white;
            padding: 40px;
            border-radius: 16px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }

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

        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: var(--dark-color);
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 14px;
            background-color: var(--bg-light);
            transition: all 0.3s ease;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            background-color: white;
            box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.15);
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .btn-submit {
            width: 100%;
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 14px;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

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

        /* 12. Token比价参考 */
        .token-table-wrapper {
            background: white;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

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

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

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

        .badge-low {
            background: #eafaf1;
            color: var(--primary-color);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: bold;
        }

        /* 13. 职业技术培训 & 14. 人工智能培训 */
        .training-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .training-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

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

        .training-tag {
            background: var(--primary-light);
            color: var(--primary-color);
            font-size: 11px;
            font-weight: bold;
            padding: 3px 8px;
            border-radius: 4px;
            display: inline-block;
            margin-bottom: 15px;
        }

        .training-card h4 {
            font-size: 18px;
            color: var(--dark-color);
            margin-bottom: 10px;
        }

        .training-card p {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 15px;
        }

        .training-meta {
            font-size: 12px;
            font-weight: bold;
            color: var(--dark-color);
            border-top: 1px solid var(--border-color);
            padding-top: 15px;
        }

        /* 软件介绍 / 平台优势 */
        .software-section {
            background: var(--primary-light) !important;
        }

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

        .software-card {
            background: white;
            border-radius: 8px;
            padding: 25px;
            border: 1px solid rgba(46, 204, 113, 0.1);
        }

        .software-card h4 {
            color: var(--dark-color);
            margin-bottom: 10px;
        }

        .software-card p {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 15. 帮助中心 & 17. 常见问题自助排查 */
        .help-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

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

        .help-card h4 {
            color: var(--dark-color);
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .help-card ul {
            list-style: none;
        }

        .help-card li {
            margin-bottom: 10px;
            font-size: 13px;
        }

        .help-card li a {
            color: var(--text-color);
        }

        .help-card li a:hover {
            color: var(--primary-color);
        }

        /* 16. 常见用户问题 FAQ */
        .faq-wrapper {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 15px;
            overflow: hidden;
            transition: border-color 0.3s;
        }

        .faq-item:hover {
            border-color: var(--primary-color);
        }

        .faq-question {
            padding: 20px;
            font-weight: 600;
            color: var(--dark-color);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }

        .faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.3s cubic-bezier(0, 1, 0, 1);
            color: var(--text-color);
            font-size: 14px;
            line-height: 1.7;
        }

        .faq-item.active .faq-answer {
            padding: 0 20px 20px;
            max-height: 500px;
            transition: all 0.3s cubic-bezier(1, 0, 1, 0);
        }

        .faq-icon {
            transition: transform 0.3s;
        }

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

        /* 18. 网站术语百科 */
        .terms-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .term-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px;
        }

        .term-title {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 6px;
            font-size: 15px;
        }

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

        /* 6条 客户评论卡片 */
        .reviews-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
            margin-bottom: 40px;
        }

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

        .review-stars {
            color: #f1c40f;
            margin-bottom: 12px;
        }

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

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

        .author-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary-color);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
        }

        .author-info h5 {
            font-size: 14px;
            color: var(--dark-color);
        }

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

        /* 19. 行业资讯 / 知识库 */
        .articles-wrapper {
            max-width: 800px;
            margin: 0 auto;
        }

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

        .article-item {
            padding: 20px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: white;
            margin-bottom: 10px;
            border-radius: 8px;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s;
        }

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

        .article-info h4 {
            font-size: 16px;
            color: var(--dark-color);
            margin-bottom: 6px;
        }

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

        .btn-read {
            font-size: 14px;
            color: var(--primary-color);
            font-weight: 600;
        }

        /* 20. 联系我们底页 */
        footer {
            background-color: var(--dark-color);
            color: #ecf0f1;
            padding: 60px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding-bottom: 40px;
        }

        .footer-brand h4 {
            font-size: 20px;
            margin-bottom: 15px;
            color: white;
        }

        .footer-brand p {
            font-size: 14px;
            color: #bdc3c7;
            margin-bottom: 10px;
        }

        .footer-links h5 {
            font-size: 16px;
            color: white;
            margin-bottom: 15px;
        }

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

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

        .footer-links a {
            color: #bdc3c7;
            font-size: 14px;
        }

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

        .footer-qr {
            display: flex;
            flex-direction: column;
            align-items: flex-start;
        }

        .qr-wrapper {
            background: white;
            padding: 10px;
            border-radius: 8px;
            margin-bottom: 10px;
            width: 130px;
            height: 130px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .qr-wrapper img {
            width: 100%;
            height: auto;
        }

        .footer-qr p {
            font-size: 13px;
            color: #bdc3c7;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: #7f8c8d;
            flex-wrap: wrap;
            gap: 15px;
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 15px;
            border-top: 1px solid rgba(255,255,255,0.05);
            padding-top: 15px;
            width: 100%;
        }

        .friend-links a {
            color: #7f8c8d;
            font-size: 12px;
        }

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

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

        .kefu-btn {
            width: 50px;
            height: 50px;
            background: white;
            border-radius: 50%;
            box-shadow: var(--shadow-md);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            border: 1px solid var(--border-color);
            position: relative;
            transition: all 0.3s;
        }

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

        .kefu-btn svg {
            width: 24px;
            height: 24px;
            fill: var(--primary-color);
        }

        .kefu-qr-popup {
            position: absolute;
            right: 60px;
            bottom: 0;
            background: white;
            border: 1px solid var(--border-color);
            padding: 15px;
            border-radius: 8px;
            box-shadow: var(--shadow-md);
            display: none;
            text-align: center;
            width: 160px;
        }

        .kefu-qr-popup img {
            width: 120px;
            height: 120px;
            margin-bottom: 8px;
        }

        .kefu-qr-popup p {
            font-size: 12px;
            color: var(--dark-color);
            margin: 0;
        }

        .kefu-btn:hover .kefu-qr-popup {
            display: block;
        }

        .back-to-top {
            display: none;
        }

        /* 响应式适配 */
        @media (max-width: 1024px) {
            .stats-grid, .platform-grid, .tech-standards, .training-grid, .help-grid, .reviews-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .software-grid, .terms-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }
            .nav-menu {
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 20px;
                box-shadow: var(--shadow-md);
                display: none;
                border-bottom: 1px solid var(--border-color);
            }
            .nav-menu.active {
                display: flex;
            }
            .hero-title {
                font-size: 32px;
            }
            .about-grid, .solutions-grid, .network-grid, .case-grid, .form-grid, .footer-grid {
                grid-template-columns: 1fr;
            }
            .process-flow {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 480px) {
            .process-flow, .stats-grid, .platform-grid, .tech-standards, .training-grid, .help-grid, .reviews-grid, .software-grid, .terms-grid {
                grid-template-columns: 1fr;
            }
            .hero-buttons {
                flex-direction: column;
            }
            .btn-primary, .btn-secondary {
                width: 100%;
            }
        }