:root {
      --primary-cyan: #0284c7;
      --primary-teal: #0d9488;
      --primary-accent: #0ea5e9;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(14, 165, 233, 0.06);
      --shadow-md: 0 8px 24px rgba(2, 132, 199, 0.1);
      --shadow-hover: 0 12px 32px rgba(13, 148, 136, 0.18);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
    }

    * {
      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;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background-color: var(--bg-main);
    }

    a {
      color: var(--primary-cyan);
      text-decoration: none;
      transition: color 0.25s ease;
    }

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

    /* 容器规范 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      box-sizing: border-box;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .ai-page-home-link {
      font-size: 14px;
      font-weight: 600;
      padding: 4px 10px;
      background: #e0f2fe;
      color: #0369a1;
      border-radius: var(--radius-sm);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 严格按照要求设置为 0 */
      list-style: none;
    }

    .nav-links li a {
      display: block;
      padding: 8px 11px;
      font-size: 13px;
      font-weight: 500;
      color: var(--text-muted);
      white-space: nowrap;
      transition: all 0.2s ease;
    }

    .nav-links li a:hover {
      color: var(--primary-cyan);
      background: #f0f9ff;
      border-radius: var(--radius-sm);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-cyan) 0%, var(--primary-teal) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(2, 132, 199, 0.28);
    }

    .btn-primary:hover {
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(13, 148, 136, 0.35);
    }

    .btn-secondary {
      background: #ffffff;
      border-color: var(--primary-cyan);
      color: var(--primary-cyan);
    }

    .btn-secondary:hover {
      background: #f0f9ff;
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 22px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 模块通用样式 */
    .section-padding {
      padding: 70px 0;
      border-bottom: 1px solid #f1f5f9;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 45px auto;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 600;
      color: var(--primary-cyan);
      background: #e0f2fe;
      border-radius: 50px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 首屏 HERO (无图片) */
    .hero-section {
      padding: 80px 0 70px 0;
      background: linear-gradient(180deg, #e0f2fe 0%, #f8fafc 100%);
      position: relative;
      overflow: hidden;
    }

    .hero-container {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #bae6fd;
      border-radius: 50px;
      font-size: 13px;
      color: #0284c7;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: 0 2px 10px rgba(14, 165, 233, 0.08);
    }

    .hero-title {
      font-size: 38px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      background: linear-gradient(135deg, #0f172a 30%, #0369a1 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 17px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 45px;
      flex-wrap: wrap;
    }

    .hero-actions .btn {
      padding: 12px 28px;
      font-size: 15px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

    .stat-num {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary-cyan);
      margin-bottom: 4px;
    }

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

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

    .about-card {
      background: var(--bg-card);
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .about-card h3 {
      font-size: 20px;
      margin-bottom: 14px;
      color: var(--text-main);
    }

    .about-list {
      list-style: none;
      margin-top: 16px;
    }

    .about-list li {
      position: relative;
      padding-left: 24px;
      margin-bottom: 10px;
      font-size: 14px;
      color: var(--text-muted);
    }

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

    /* AIGC服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #7dd3fc;
    }

    .service-icon {
      width: 48px;
      height: 48px;
      background: #e0f2fe;
      color: var(--primary-cyan);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 18px;
      margin-bottom: 10px;
    }

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

    /* 一站式制作矩阵 & 场景全景 */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .matrix-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 18px;
      transition: all 0.25s ease;
    }

    .matrix-item:hover {
      border-color: var(--primary-cyan);
      box-shadow: var(--shadow-sm);
    }

    .matrix-item h4 {
      font-size: 15px;
      color: var(--primary-cyan);
      margin-bottom: 6px;
    }

    .matrix-item p {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 支持AI模型云块 */
    .models-cloud {
      margin-top: 35px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px dashed #93c5fd;
      text-align: center;
    }

    .models-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 14px;
    }

    .tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
    }

    .model-tag {
      font-size: 12px;
      padding: 4px 10px;
      background: #f0f9ff;
      color: #0369a1;
      border: 1px solid #bae6fd;
      border-radius: 4px;
    }

    /* 行业方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .solution-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
    }

    .solution-card h3 {
      font-size: 17px;
      margin-bottom: 12px;
      color: var(--primary-teal);
    }

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

    /* 服务网络 */
    .network-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px;
      border: 1px solid var(--border-color);
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 30px;
      align-items: center;
    }

    .network-center h3 {
      font-size: 20px;
      color: var(--primary-cyan);
      margin-bottom: 10px;
    }

    .network-nodes {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
    }

    .node-pill {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      padding: 10px;
      border-radius: var(--radius-sm);
      text-align: center;
      font-size: 13px;
      font-weight: 500;
    }

    /* 标准流程 */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-num {
      font-size: 28px;
      font-weight: 900;
      color: #cbd5e1;
      margin-bottom: 10px;
    }

    .step-card h3 {
      font-size: 16px;
      margin-bottom: 8px;
    }

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

    /* 案例中心 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

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

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

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .case-info {
      padding: 16px;
    }

    .case-info h4 {
      font-size: 15px;
      margin-bottom: 6px;
    }

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

    /* 对比评测 (严格要求的字段) */
    .rating-banner {
      background: linear-gradient(135deg, #0f172a 0%, #0369a1 100%);
      color: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
    }

    .rating-score {
      font-size: 36px;
      font-weight: 900;
      color: #38bdf8;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 20px;
      margin-top: 4px;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
    }

    .compare-table th, .compare-table td {
      padding: 16px;
      text-align: left;
      font-size: 14px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
    }

    .compare-table td.highlight {
      background: #f0f9ff;
      font-weight: 600;
      color: var(--primary-cyan);
    }

    /* 需求匹配与算力指导 */
    .matching-box {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }

    .matching-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .match-card {
      border: 1px solid var(--border-color);
      padding: 20px;
      border-radius: var(--radius-md);
      background: #f8fafc;
    }

    .match-card h4 {
      font-size: 16px;
      color: var(--primary-cyan);
      margin-bottom: 8px;
    }

    /* Token比价 */
    .token-table {
      width: 100%;
      border-collapse: collapse;
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
    }

    .token-table th, .token-table td {
      padding: 14px 18px;
      font-size: 13px;
      border-bottom: 1px solid var(--border-color);
    }

    .token-table th {
      background: #f1f5f9;
    }

    /* 帮助中心 & AI百科 */
    .help-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .help-card {
      background: #ffffff;
      padding: 22px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      max-width: 840px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 18px 22px;
      background: none;
      border: none;
      text-align: left;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--primary-cyan);
    }

    .faq-item.active .faq-question::after {
      content: "−";
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      font-size: 14px;
      color: var(--text-muted);
      padding: 0 22px;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 22px 20px 22px;
      border-top: 1px solid var(--border-color);
    }

    /* 客户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .user-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e0f2fe;
      color: var(--primary-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .user-info h5 {
      font-size: 14px;
    }

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

    .review-content {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 加盟代理 */
    .agency-box {
      background: linear-gradient(135deg, #e0f2fe 0%, #f0fdf4 100%);
      border: 1px solid #bae6fd;
      border-radius: var(--radius-lg);
      padding: 40px;
      text-align: center;
    }

    .agency-title {
      font-size: 24px;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .agency-desc {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    /* 行业资讯 / 文章列表 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .article-card h4 {
      font-size: 15px;
      margin-bottom: 8px;
    }

    .article-card a {
      font-size: 13px;
    }

    /* 联系我们 & 表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .contact-info-card {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }

    .qr-container {
      margin-top: 20px;
      text-align: center;
      background: #f8fafc;
      padding: 20px;
      border-radius: var(--radius-md);
    }

    .qr-container img {
      max-width: 160px;
      height: auto;
      border-radius: var(--radius-sm);
    }

    .contact-form-card {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
    }

    .form-control:focus {
      border-color: var(--primary-cyan);
    }

    textarea.form-control {
      height: 100px;
      resize: vertical;
    }

    /* 底部 FOOTER */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 25px 0;
      font-size: 13px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 2fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      margin-bottom: 16px;
    }

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

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

    .footer-links a {
      color: #94a3b8;
    }

    .footer-links a:hover {
      color: #38bdf8;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links a {
      color: #cbd5e1;
      background: #1e293b;
      padding: 4px 8px;
      border-radius: 4px;
      font-size: 12px;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      color: #64748b;
    }

    /* 浮动组件 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 20px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      background: var(--primary-cyan);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      cursor: pointer;
      font-size: 18px;
      border: none;
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .matrix-grid, .solution-grid, .services-grid, .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .reviews-grid, .cases-grid, .help-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 15px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .hero-title {
        font-size: 26px;
      }
      .hero-stats, .about-grid, .services-grid, .matrix-grid, .solution-grid, .process-steps, .cases-grid, .reviews-grid, .contact-wrapper, .matching-grid, .help-grid, .articles-grid {
        grid-template-columns: 1fr;
      }
      .network-box {
        grid-template-columns: 1fr;
      }
      .network-nodes {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
        gap: 15px;
      }
    }