/* 基础重置与变量 */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --bg-body: #f6fbf8;
      --bg-white: #ffffff;
      --bg-soft: #e9f3ef;
      --primary: #2e7d5e;
      --primary-light: #4b9b7a;
      --primary-dark: #1d5a42;
      --accent: #a8e6cf;
      --accent-deep: #58b998;
      --text-dark: #1a2e26;
      --text-main: #2d3f37;
      --text-muted: #5e7b6e;
      --border-light: #d0e5da;
      --shadow-sm: 0 4px 12px rgba(46, 125, 94, 0.06);
      --shadow-md: 0 12px 28px rgba(46, 125, 94, 0.1);
      --shadow-hover: 0 18px 36px rgba(46, 125, 94, 0.16);
      --radius-card: 20px;
      --radius-btn: 40px;
      --font-main: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --container-max: 1200px;
      --container-pad: 24px;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: var(--font-main);
      background-color: var(--bg-body);
      background-image: radial-gradient(circle at 10% 20%, rgba(168, 230, 207, 0.25) 0%, transparent 35%),
                        radial-gradient(circle at 90% 70%, rgba(88, 185, 152, 0.12) 0%, transparent 40%);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* 通用容器 */
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding-left: var(--container-pad);
      padding-right: var(--container-pad);
      width: 100%;
    }

    /* 排版 */
    h1, h2, h3, h4 {
      color: var(--text-dark);
      font-weight: 600;
      line-height: 1.3;
    }

    h1 {
      font-size: 2.6rem;
      letter-spacing: -0.02em;
    }

    h2 {
      font-size: 2rem;
      margin-bottom: 12px;
    }

    h3 {
      font-size: 1.35rem;
    }

    p {
      color: var(--text-main);
    }

    a {
      text-decoration: none;
      color: var(--primary);
      transition: color 0.2s ease;
    }

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

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      text-align: center;
      gap: 8px;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 8px 18px rgba(46, 125, 94, 0.28);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-3px);
      box-shadow: 0 14px 24px rgba(46, 125, 94, 0.35);
      color: #fff;
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #fff;
      transform: translateY(-2px);
    }

    .btn-soft {
      background: var(--bg-soft);
      color: var(--primary-dark);
    }

    .btn-soft:hover {
      background: var(--accent);
      transform: translateY(-2px);
    }

    .btn-small {
      padding: 8px 20px;
      font-size: 0.9rem;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 12px rgba(46, 125, 94, 0.04);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 70px;
      gap: 16px;
    }

    .logo-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .ai-page-logo {
      max-height: 42px;
      width: auto;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 按需求设置 gap:0 */
      list-style: none;
      flex-wrap: wrap;
    }

    .nav-links li a {
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 30px;
      display: block;
      transition: background 0.2s, color 0.2s;
    }

    .nav-links li a:hover {
      background: var(--bg-soft);
      color: var(--primary-dark);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .mobile-toggle {
      display: none;
      background: transparent;
      border: 1px solid var(--border-light);
      font-size: 1.6rem;
      padding: 4px 12px;
      border-radius: 12px;
      color: var(--primary);
      cursor: pointer;
    }

    /* 首屏 HERO 无图片 */
    .hero {
      padding: 60px 0 50px;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      max-width: 780px;
      margin: 0 auto;
      text-align: center;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-block;
      background: var(--bg-soft);
      color: var(--primary-dark);
      font-size: 0.85rem;
      font-weight: 600;
      padding: 6px 18px;
      border-radius: 30px;
      letter-spacing: 0.3px;
      margin-bottom: 20px;
    }

    .hero h1 {
      font-size: clamp(2rem, 6vw, 3.2rem);
      margin-bottom: 18px;
      color: var(--text-dark);
    }

    .hero p {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto 28px;
    }

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

    .hero-stats {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px 50px;
      margin-top: 44px;
      padding: 26px 20px;
      background: rgba(255, 255, 255, 0.7);
      backdrop-filter: blur(6px);
      border-radius: 40px;
      border: 1px solid var(--border-light);
    }

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

    .stat-num {
      font-size: 1.9rem;
      font-weight: 700;
      color: var(--primary-dark);
      display: block;
      line-height: 1.2;
    }

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

    /* 通用 section */
    .section {
      padding: 60px 0;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 42px;
    }

    .section-header h2 {
      margin-bottom: 10px;
    }

    .section-header p {
      color: var(--text-muted);
      font-size: 1.05rem;
    }

    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 28px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
    }

    .card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .card-icon {
      font-size: 2rem;
      margin-bottom: 14px;
      display: inline-block;
    }

    .card h3 {
      margin-bottom: 10px;
      font-size: 1.25rem;
    }

    .card p {
      color: var(--text-muted);
      font-size: 0.96rem;
    }

    /* 平台介绍 + 图片 */
    .intro-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      align-items: center;
    }

    .intro-text {
      flex: 1 1 380px;
    }

    .intro-text h2 {
      text-align: left;
      margin-bottom: 18px;
    }

    .intro-text p {
      margin-bottom: 14px;
      color: var(--text-muted);
    }

    .intro-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .tag {
      background: var(--bg-soft);
      color: var(--primary-dark);
      font-size: 0.85rem;
      padding: 5px 16px;
      border-radius: 30px;
      font-weight: 500;
    }

    .intro-media {
      flex: 1 1 340px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
    }

    .intro-media img {
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
      width: 100%;
      max-width: 260px;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
      transition: transform 0.3s ease;
    }

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

    .intro-media .square-img {
      aspect-ratio: 1/1;
      max-width: 200px;
    }

    /* 流程步骤 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      justify-content: center;
    }

    .step-item {
      flex: 1 1 160px;
      text-align: center;
      background: var(--bg-white);
      border-radius: 20px;
      padding: 26px 16px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: border-color 0.2s;
    }

    .step-item:hover {
      border-color: var(--accent-deep);
    }

    .step-num {
      width: 44px;
      height: 44px;
      background: var(--bg-soft);
      color: var(--primary-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.2rem;
      margin: 0 auto 14px;
    }

    .step-item h4 {
      font-size: 1.05rem;
      margin-bottom: 6px;
    }

    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比表格 */
    .compare-table-wrap {
      overflow-x: auto;
      background: var(--bg-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 600px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      text-align: left;
      border-bottom: 1px solid var(--border-light);
    }

    .compare-table th {
      background: var(--bg-soft);
      color: var(--primary-dark);
      font-weight: 600;
    }

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

    .compare-table .highlight {
      background: rgba(168, 230, 207, 0.2);
      font-weight: 600;
      color: var(--primary-dark);
    }

    .rating-stars {
      color: #f5b342;
      letter-spacing: 2px;
    }

    /* 客户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: var(--bg-white);
      border-radius: 20px;
      padding: 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.3s ease;
    }

    .review-card:hover {
      box-shadow: var(--shadow-md);
    }

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

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.2rem;
    }

    .review-name {
      font-weight: 600;
      font-size: 1rem;
      color: var(--text-dark);
    }

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

    .review-text {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.6;
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 28px;
    }

    .case-item {
      background: var(--bg-white);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .case-item:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .case-media {
      width: 100%;
      aspect-ratio: 16/10;
      background: var(--bg-soft);
      overflow: hidden;
    }

    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .case-item:hover .case-media img {
      transform: scale(1.04);
    }

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      margin-bottom: 6px;
      font-size: 1.1rem;
    }

    .case-info p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 文章列表 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 0;
      border-bottom: 1px dashed var(--border-light);
      gap: 16px;
      flex-wrap: wrap;
    }

    .article-item:last-child {
      border-bottom: none;
    }

    .article-title {
      font-weight: 500;
      color: var(--text-dark);
    }

    .article-link {
      font-size: 0.9rem;
      color: var(--primary);
      font-weight: 500;
      white-space: nowrap;
    }

    /* FAQ 折叠 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-white);
      border-radius: 16px;
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: box-shadow 0.2s;
    }

    .faq-item.active {
      box-shadow: var(--shadow-md);
    }

    .faq-question {
      padding: 18px 22px;
      font-weight: 600;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
      user-select: none;
      transition: background 0.2s;
    }

    .faq-question:hover {
      background: var(--bg-soft);
    }

    .faq-icon {
      font-size: 1.3rem;
      color: var(--primary);
      transition: transform 0.3s ease;
      flex-shrink: 0;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s ease;
      padding: 0 22px;
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 22px 20px;
    }

    /* 表单 */
    .form-wrap {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      max-width: 780px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group.full {
      grid-column: 1 / -1;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-dark);
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      padding: 12px 16px;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      font-size: 0.95rem;
      font-family: var(--font-main);
      background: var(--bg-body);
      color: var(--text-dark);
      transition: border-color 0.2s, box-shadow 0.2s;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(46, 125, 94, 0.12);
    }

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

    /* 标签云 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .tag-cloud span {
      background: var(--bg-white);
      border: 1px solid var(--border-light);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      color: var(--text-muted);
      transition: all 0.2s;
    }

    .tag-cloud span:hover {
      background: var(--accent);
      color: var(--primary-dark);
      border-color: var(--accent-deep);
    }

    /* 页脚 */
    .site-footer {
      background: #1d3b30;
      color: #d4e8de;
      padding: 48px 0 24px;
      margin-top: 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 36px 30px;
      margin-bottom: 36px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer-col p,
    .footer-col a {
      color: #bdd6ca;
      font-size: 0.9rem;
      line-height: 1.8;
      display: block;
      margin-bottom: 6px;
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      padding-top: 22px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
      font-size: 0.85rem;
      color: #9cb8ab;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-links a {
      color: #bdd6ca;
      font-size: 0.85rem;
    }

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

    /* 浮动客服 */
    .float-service {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 12px;
      align-items: flex-end;
    }

    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      box-shadow: 0 8px 20px rgba(46, 125, 94, 0.35);
      cursor: pointer;
      border: none;
      transition: all 0.25s ease;
    }

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

    .float-qr {
      background: var(--bg-white);
      border-radius: 16px;
      padding: 12px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-light);
      display: none;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .float-qr.show {
      display: flex;
    }

    .float-qr img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border-radius: 8px;
    }

    .float-qr span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 滚动渐入动画 */
    .fade-in {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .fade-in.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 响应式 */
    @media (max-width: 1000px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 860px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        align-items: stretch;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-md);
        gap: 4px;
      }

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

      .nav-links li a {
        padding: 12px 16px;
        border-radius: 12px;
      }

      .mobile-toggle {
        display: block;
      }

      .header-inner {
        position: relative;
      }

      .form-grid {
        grid-template-columns: 1fr;
      }

      .hero-stats {
        gap: 20px 30px;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }
    }

    @media (max-width: 600px) {
      h1 {
        font-size: 1.9rem;
      }

      h2 {
        font-size: 1.6rem;
      }

      .section {
        padding: 44px 0;
      }

      .hero {
        padding: 40px 0 36px;
      }

      .form-wrap {
        padding: 24px 20px;
      }

      .hero-actions .btn {
        width: 100%;
      }

      .btn {
        padding: 12px 24px;
      }

      .compare-table th,
      .compare-table td {
        padding: 12px 14px;
        font-size: 0.9rem;
      }

      .float-service {
        right: 16px;
        bottom: 20px;
      }
    }