:root {
      --primary: #059669;
      --primary-light: #10b981;
      --primary-dark: #047857;
      --accent: #10e085;
      --bg-base: #f7faf8;
      --bg-surface: #ffffff;
      --text-main: #1f2937;
      --text-muted: #4b5563;
      --border-color: #d1fae5;
      --border-subtle: #e5e7eb;
      --shadow-sm: 0 2px 8px rgba(5, 150, 105, 0.06);
      --shadow-md: 0 8px 24px rgba(5, 150, 105, 0.1);
      --shadow-lg: 0 16px 36px rgba(5, 150, 105, 0.14);
      --radius: 12px;
      --max-width: 1240px;
      --transition: all 0.28s ease;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    /* 顶部导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
    }

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

    .logo-wrapper {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 6px;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: #ecfdf5;
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(5, 150, 105, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-light), var(--primary));
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(5, 150, 105, 0.4);
      color: #ffffff;
    }

    .btn-secondary {
      background: #ecfdf5;
      color: var(--primary-dark);
      border-color: var(--border-color);
    }

    .btn-secondary:hover {
      background: #d1fae5;
      color: var(--primary-dark);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 70px 0 60px;
      background: radial-gradient(circle at 50% 20%, #e6fcf0 0%, var(--bg-base) 70%);
      text-align: center;
      position: relative;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ecfdf5;
      color: var(--primary-dark);
      padding: 6px 16px;
      border-radius: 99px;
      font-size: 0.88rem;
      font-weight: 600;
      border: 1px solid #a7f3d0;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.25;
      color: #064e3b;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-stat-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      padding: 20px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }

    .stat-value {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Section 通用 */
    .section {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-subtle);
    }

    .section-light {
      background-color: #ffffff;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 平台矩阵标签云 */
    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      background: #ecfdf5;
      color: var(--primary-dark);
      padding: 8px 16px;
      border-radius: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      border: 1px solid #a7f3d0;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 网格系统 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

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

    /* 通用卡片 */
    .card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: #d1fae5;
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.2rem;
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #111827;
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex-grow: 1;
      line-height: 1.6;
    }

    /* 图文展示模块 */
    .media-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .media-thumb {
      width: 100%;
      background: #e5e7eb;
      overflow: hidden;
    }

    .media-thumb img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }

    .media-thumb img:hover {
      transform: scale(1.02);
    }

    .media-body {
      padding: 22px;
    }

    /* 步骤流程 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

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

    .step-badge {
      display: inline-block;
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      text-align: center;
      line-height: 32px;
      font-weight: 700;
      margin-bottom: 14px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    /* 对比表格 */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .custom-table th,
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-subtle);
      font-size: 0.95rem;
    }

    .custom-table th {
      background: #f0fdf4;
      color: #065f46;
      font-weight: 700;
    }

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

    .rating-badge {
      background: #fef3c7;
      color: #92400e;
      padding: 4px 10px;
      border-radius: 6px;
      font-weight: 700;
      display: inline-block;
    }

    .check-icon {
      color: var(--primary);
      font-weight: 700;
    }

    /* 用户评论 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px dashed var(--border-subtle);
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #d1fae5;
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .author-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: #111827;
    }

    .author-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: #111827;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
    }

    .faq-question:hover {
      color: var(--primary);
      background: #f0fdf4;
    }

    .faq-toggle {
      font-size: 1.2rem;
      color: var(--primary);
      font-weight: 700;
      transition: transform 0.2s ease;
    }

    .faq-answer {
      padding: 0 24px 18px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      display: none;
      border-top: 1px solid #f0fdf4;
      background: #fafdfb;
    }

    .faq-item.active .faq-answer {
      display: block;
      padding-top: 14px;
    }

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

    /* 文章列表 */
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 24px;
    }

    .article-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 10px 18px;
      border-radius: 8px;
      font-size: 0.9rem;
      color: var(--text-main);
      font-weight: 500;
    }

    .article-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f0fdf4;
    }

    /* 表单组件 */
    .form-wrapper {
      max-width: 680px;
      margin: 0 auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      color: #374151;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #d1d5db;
      border-radius: 8px;
      font-size: 0.95rem;
      color: #1f2937;
      background: #ffffff;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 微信客服与联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }

    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 1rem;
      color: var(--text-main);
    }

    .contact-icon {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: #ecfdf5;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .qr-box {
      text-align: center;
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      max-width: 260px;
      margin: 0 auto;
    }

    .qr-box img {
      width: 180px;
      height: 180px;
      object-fit: contain;
      display: block;
      margin: 0 auto 12px;
      border-radius: 8px;
    }

    .qr-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    /* 友情链接 */
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 16px;
    }

    .friend-links a {
      font-size: 0.88rem;
      color: var(--text-muted);
      background: #f3f4f6;
      padding: 6px 14px;
      border-radius: 6px;
    }

    .friend-links a:hover {
      color: var(--primary);
      background: #ecfdf5;
    }

    /* 页脚 */
    .footer {
      background: #064e3b;
      color: #ecfdf5;
      padding: 48px 0 24px;
      font-size: 0.92rem;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      padding-bottom: 36px;
      border-bottom: 1px solid #065f46;
    }

    .footer-brand h4 {
      font-size: 1.3rem;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .footer-brand p {
      color: #a7f3d0;
      max-width: 400px;
      line-height: 1.6;
    }

    .footer-col h5 {
      font-size: 1rem;
      color: #ffffff;
      margin-bottom: 14px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-col a {
      color: #d1fae5;
    }

    .footer-col a:hover {
      color: #ffffff;
      text-decoration: underline;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      color: #a7f3d0;
      font-size: 0.85rem;
    }

    /* 浮动客服入口 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .dock-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      box-shadow: 0 4px 14px rgba(0,0,0,0.15);
      cursor: pointer;
      transition: var(--transition);
      border: none;
    }

    .dock-btn:hover {
      background: var(--primary-dark);
      transform: scale(1.08);
    }

    /* 响应式 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-stats-grid,
      .steps-grid,
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 16px;
      }
      .menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .hero-stats-grid,
      .steps-grid,
      .grid-2,
      .grid-3,
      .grid-4 {
        grid-template-columns: 1fr;
      }
      .form-wrapper {
        padding: 24px 16px;
      }
    }