:root {
      --primary: #10b981;
      --primary-dark: #047857;
      --primary-light: #ecfdf5;
      --accent: #14b8a6;
      --mint-bg: #f4fbf7;
      --surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #d1fae5;
      --card-shadow: 0 10px 30px -5px rgba(16, 185, 129, 0.08);
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--mint-bg);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      width: 100%;
      overflow-x: hidden;
      background-color: var(--mint-bg);
    }

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

    /* 顶部导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

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

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 严格满足 CSS .nav-links gap 属性设置为 0 要求 */
      list-style: none;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text-main);
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      transition: color 0.2s;
    }

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

    .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: 15px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary-dark);
    }

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

    /* 移动端菜单开关 */
    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 5px;
    }

    .menu-toggle span {
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      transition: 0.3s;
    }

    /* 首屏 HERO 区域 - 严格不出现任何图片 */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 0%, #d1fae5 0%, var(--mint-bg) 70%);
      position: relative;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 30px;
      font-size: 14px;
      color: var(--primary-dark);
      margin-bottom: 24px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: #064e3b;
      line-height: 1.3;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      max-width: 800px;
      margin: 0 auto 36px;
      font-size: 1.125rem;
      color: var(--text-muted);
      line-height: 1.8;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      margin-top: 40px;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      text-align: center;
    }

    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 常见 Block 标题 */
    .section-padding {
      padding: 80px 0;
    }

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

    .section-tag {
      color: var(--primary-dark);
      font-size: 0.9rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      color: #064e3b;
      font-weight: 700;
    }

    .section-subtitle {
      color: var(--text-muted);
      max-width: 680px;
      margin: 10px auto 0;
      font-size: 1rem;
    }

    /* 卡片通用 Grid */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .card {
      background: var(--surface);
      padding: 30px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: 0 15px 35px -5px rgba(16, 185, 129, 0.15);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
      color: var(--primary-dark);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: #064e3b;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 支持模型标签云 */
    .tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .tag-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.9rem;
      color: var(--text-main);
      font-weight: 500;
      box-shadow: 0 2px 5px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }

    .tag-item:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 案例图片展示区 */
    .media-gallery {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
      margin-top: 40px;
    }

    .media-card {
      background: #ffffff;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .media-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
    }

    .media-body {
      padding: 20px;
    }

    /* 对比表格 */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      margin-top: 30px;
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

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

    .custom-table tr:hover {
      background: #f8fafc;
    }

    .rating-badge {
      background: #fef3c7;
      color: #d97706;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 700;
      display: inline-block;
    }

    /* 折叠面板 (FAQ) */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .faq-header {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: #064e3b;
      user-select: none;
    }

    .faq-header::after {
      content: '+';
      font-size: 1.4rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-header::after {
      content: '−';
    }

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fafdfc;
      color: var(--text-muted);
      font-size: 0.95rem;
    }

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

    /* 评论卡片 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .testimonial-card {
      background: #ffffff;
      padding: 28px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-top: 20px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    /* 表单 */
    .form-container {
      max-width: 700px;
      margin: 0 auto;
      background: #ffffff;
      padding: 40px;
      border-radius: 20px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

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

    .form-label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 15px;
      transition: border-color 0.2s;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }

    /* 底部区域 */
    .footer {
      background: #064e3b;
      color: #ecfdf5;
      padding: 60px 0 30px;
      margin-top: 60px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 20px;
    }

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

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

    .footer-col a {
      color: #a7f3d0;
      text-decoration: none;
      transition: color 0.2s;
    }

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

    .qr-img img {
      width: 120px;
      height: 120px;
      border-radius: 8px;
      background: #ffffff;
      padding: 4px;
    }

    .footer-bottom {
      border-top: 1px solid #047857;
      padding-top: 24px;
      text-align: center;
      font-size: 0.9rem;
      color: #a7f3d0;
    }

    /* 浮动客服 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
      border-radius: 12px;
      padding: 12px;
      text-align: center;
      width: 130px;
    }

    .floating-kefu img {
      width: 100px;
      height: 100px;
      display: block;
      margin: 0 auto 6px;
    }

    .floating-kefu p {
      font-size: 12px;
      color: var(--primary-dark);
      font-weight: bold;
    }

    /* 响应式调整 */
    @media (max-width: 900px) {
      .menu-toggle {
        display: flex;
      }

      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px 0;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        border-bottom: 1px solid var(--border-color);
      }

      .nav-links.active {
        display: flex;
      }

      .hero-title {
        font-size: 1.8rem;
      }

      .floating-kefu {
        display: none; /* 移动端隐藏或微调 */
      }
    }