:root {
      --primary: #009688;
      --primary-dark: #00796b;
      --primary-light: #e0f2f1;
      --primary-soft: #b2dfdb;
      --accent: #0284c7;
      --accent-gradient: linear-gradient(135deg, #009688 0%, #0284c7 100%);
      --bg-page: #f7fbfa;
      --bg-card: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #d1fae5;
      --shadow-sm: 0 2px 8px rgba(0, 150, 136, 0.06);
      --shadow-md: 0 10px 25px -5px rgba(0, 150, 136, 0.1), 0 8px 10px -6px rgba(0, 150, 136, 0.05);
      --shadow-hover: 0 16px 32px rgba(0, 150, 136, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

    /* 容器布局 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-box .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
      object-fit: contain;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links a {
      display: block;
      padding: 8px 14px;
      color: var(--text-main);
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      transition: color 0.25s ease;
      white-space: nowrap;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: var(--accent-gradient);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(0, 150, 136, 0.25);
    }

    .btn-primary:hover {
      opacity: 0.95;
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(0, 150, 136, 0.35);
    }

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

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

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

    /* 首屏 Hero 区域 (严格禁止任何图片) */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, rgba(2, 132, 199, 0.08), transparent 40%),
                  radial-gradient(circle at 10% 70%, rgba(0, 150, 136, 0.12), transparent 50%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 80px 0 60px;
      position: relative;
    }

    .hero-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      border-radius: 50px;
      background: var(--primary-light);
      color: var(--primary-dark);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
      border: 1px solid var(--border-color);
    }

    .hero-title {
      font-size: 40px;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      font-weight: 800;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 760px;
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-btn-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .hero-btn-large {
      padding: 14px 34px;
      font-size: 16px;
      border-radius: 30px;
    }

    /* 首屏数据指标卡片 (纯 CSS，不使用图片) */
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      width: 100%;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      text-align: left;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

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

    .stat-card .desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.4;
    }

    /* 通用章节样式 */
    section {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px;
    }

    .section-eyebrow {
      color: var(--primary);
      font-size: 14px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 32px;
      color: #0f172a;
      font-weight: 800;
      margin-bottom: 14px;
      line-height: 1.3;
    }

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

    /* 支持模型标签云 */
    .models-cloud-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      margin-top: 20px;
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-pill {
      background: var(--bg-page);
      border: 1px solid #e2e8f0;
      padding: 7px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      border-color: var(--primary);
      color: var(--primary-dark);
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    /* 平台介绍与图文版块 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-content h3 {
      font-size: 26px;
      margin-bottom: 18px;
      color: #0f172a;
      font-weight: 700;
    }

    .intro-content p {
      color: #475569;
      font-size: 15px;
      margin-bottom: 16px;
      line-height: 1.8;
    }

    .intro-highlights {
      list-style: none;
      margin-top: 20px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .intro-highlights li {
      font-size: 14px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .intro-highlights li::before {
      content: "✔";
      color: var(--primary);
      font-weight: bold;
    }

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

    .media-card img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .media-card-caption {
      padding: 14px 18px;
      font-size: 13px;
      color: var(--text-muted);
      border-top: 1px solid #f1f5f9;
      background: #ffffff;
    }

    /* 核心服务场景卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .service-card-header {
      margin-bottom: 14px;
    }

    .service-badge {
      display: inline-block;
      padding: 3px 9px;
      background: var(--primary-light);
      color: var(--primary-dark);
      font-size: 12px;
      font-weight: 700;
      border-radius: 4px;
      margin-bottom: 10px;
    }

    .service-card h3 {
      font-size: 19px;
      color: #0f172a;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .service-card p {
      font-size: 14px;
      color: #475569;
      line-height: 1.6;
    }

    /* 一站式制作与全流程 */
    .process-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary-soft);
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-card h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: #0f172a;
    }

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

    /* 对比评测版块 */
    .review-score-hero {
      background: linear-gradient(135deg, #e0f2f1 0%, #e0f7fa 100%);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 24px;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 6px;
    }

    .score-left p {
      font-size: 14px;
      color: #334155;
    }

    .score-right {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .star-rating {
      color: #f59e0b;
      font-size: 24px;
      letter-spacing: 2px;
    }

    .score-badge {
      background: #ffffff;
      padding: 10px 22px;
      border-radius: 40px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      border: 1px solid var(--border-color);
    }

    .score-badge .score-val {
      font-size: 30px;
      font-weight: 900;
      color: var(--primary-dark);
      line-height: 1;
    }

    .score-badge .score-max {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 600;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 14px;
    }

    .comparison-table th {
      background: #f8fafc;
      color: #0f172a;
      font-weight: 700;
    }

    .comparison-table th.highlight-col,
    .comparison-table td.highlight-col {
      background: #f0fdf4;
      color: var(--primary-dark);
      font-weight: 600;
    }

    /* 案例中心 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .case-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .case-body {
      padding: 20px;
    }

    .case-body h3 {
      font-size: 17px;
      margin-bottom: 8px;
      color: #0f172a;
      font-weight: 700;
    }

    .case-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 18px;
      font-style: normal;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

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

    .reviewer-info h4 {
      font-size: 14px;
      color: #0f172a;
      font-weight: 700;
    }

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

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color 0.25s ease;
    }

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

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: none;
      border: none;
      text-align: left;
      font-size: 16px;
      font-weight: 600;
      color: #0f172a;
      cursor: pointer;
    }

    .faq-icon {
      font-size: 20px;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #fafcfb;
      padding: 0 24px;
      font-size: 14px;
      color: #475569;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
    }

    /* 需求表单与加盟 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
    }

    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 34px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: #334155;
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      background: #ffffff;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 150, 136, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

    .contact-info-box {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-lg);
      padding: 34px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-channels {
      list-style: none;
      margin-top: 14px;
    }

    .contact-channels li {
      margin-bottom: 14px;
      font-size: 14px;
      color: #334155;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qr-container {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-top: 20px;
      padding: 16px;
      background: var(--bg-page);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .qr-container img {
      width: 96px;
      height: 96px;
      object-fit: contain;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
      background: #ffffff;
    }

    .qr-text h4 {
      font-size: 15px;
      color: #0f172a;
      font-weight: 700;
      margin-bottom: 4px;
    }

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

    /* 资讯与友情链接 */
    .article-links-container, .friendly-links-container {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 22px;
      margin-top: 14px;
    }

    .article-links, .friendly-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      list-style: none;
    }

    .article-links a, .friendly-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 13px;
      transition: color 0.2s ease;
      background: #f8fafc;
      padding: 6px 12px;
      border-radius: 4px;
      border: 1px solid #f1f5f9;
    }

    .article-links a:hover, .friendly-links a:hover {
      color: var(--primary);
      border-color: var(--primary-soft);
      background: var(--primary-light);
    }

    /* 页脚 */
    footer.site-footer {
      background: #111827;
      color: #94a3b8;
      padding: 50px 0 30px;
      margin-top: 70px;
      font-size: 14px;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      color: #ffffff;
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 14px;
    }

    .footer-brand p {
      line-height: 1.7;
      font-size: 13px;
      color: #cbd5e1;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 16px;
    }

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

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul a {
      color: #94a3b8;
      text-decoration: none;
      transition: color 0.2s ease;
      font-size: 13px;
    }

    .footer-col ul a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
    }

    .footer-bottom a {
      color: #94a3b8;
      text-decoration: none;
    }

    .footer-bottom a:hover {
      color: #ffffff;
    }

    /* 浮动客服入口 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-dark);
      text-decoration: none;
      font-size: 18px;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 32px;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid, .cases-grid, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .intro-grid, .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-menu-open .nav-links {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 0;
        box-shadow: var(--shadow-md);
      }
      .mobile-menu-open .nav-links a {
        padding: 12px 24px;
        width: 100%;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 26px;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .services-grid, .cases-grid, .testimonials-grid, .process-steps-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .review-score-hero {
        flex-direction: column;
        align-items: flex-start;
      }
    }