:root {
      --primary: #0ca694;
      --primary-dark: #087f71;
      --primary-light: #e6f7f5;
      --secondary: #0284c7;
      --accent-cyan: #20c997;
      --bg-page: #f8fafb;
      --bg-surface: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(12, 166, 148, 0.05);
      --shadow-md: 0 8px 24px rgba(12, 166, 148, 0.08);
      --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.08);
      --radius: 12px;
      --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", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

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

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #0f172a;
      letter-spacing: -0.2px;
    }

    .brand-badge {
      display: inline-block;
      font-size: 0.7rem;
      background: var(--primary-light);
      color: var(--primary-dark);
      padding: 2px 8px;
      border-radius: 20px;
      font-weight: 600;
    }

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

    .nav-link {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.95rem;
      font-weight: 500;
      color: #334155;
      text-decoration: none;
      border-radius: 6px;
      transition: var(--transition);
      white-space: nowrap;
    }

    .nav-link:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: 8px;
      text-decoration: none;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn:active {
      transform: scale(0.98);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(12, 166, 148, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #10b981 0%, var(--primary-dark) 100%);
      box-shadow: 0 6px 16px rgba(12, 166, 148, 0.35);
      transform: translateY(-1px);
    }

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

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

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* 模块基础样式 */
    section {
      padding: 70px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 46px;
    }

    .section-eyebrow {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 30px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    /* 首屏 Hero - 无图片 pure CSS */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% -20%, #d8f5f0 0%, #edf8f6 40%, #f8fafb 100%);
      border-bottom: 1px solid #e7f1ef;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-h1 {
      font-size: 2.6rem;
      font-weight: 800;
      color: #042f2e;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: #334155;
      margin-bottom: 30px;
      line-height: 1.7;
    }

    .hero-btn-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 44px;
    }

    .hero-btn-primary {
      font-size: 1.15rem;
      padding: 14px 34px;
      box-shadow: 0 8px 24px rgba(12, 166, 148, 0.3);
    }

    .model-pills {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid rgba(12, 166, 148, 0.2);
      border-radius: 14px;
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }

    .model-pills-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 12px;
      font-weight: 600;
    }

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

    .tag-chip {
      background: #f1f8f7;
      color: #0f766e;
      font-size: 0.82rem;
      font-weight: 500;
      padding: 5px 11px;
      border-radius: 6px;
      border: 1px solid #ccebe6;
      transition: var(--transition);
    }

    .tag-chip:hover {
      background: #0ca694;
      color: #ffffff;
      border-color: #0ca694;
    }

    /* 指标栏 */
    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -30px;
      position: relative;
      z-index: 10;
    }

    .metric-card {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-md);
      border: 1px solid #eef2f6;
      transition: var(--transition);
    }

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

    .metric-val {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }

    .metric-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: #1e293b;
      margin-bottom: 4px;
    }

    .metric-sub {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 平台介绍 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

    .about-text h3 {
      font-size: 1.7rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: #0f172a;
    }

    .about-text p {
      font-size: 1rem;
      color: #475569;
      margin-bottom: 18px;
    }

    .about-features {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-top: 24px;
    }

    .about-features li {
      font-size: 0.9rem;
      font-weight: 600;
      color: #1e293b;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .about-features li::before {
      content: "✓";
      color: var(--primary);
      background: var(--primary-light);
      width: 20px;
      height: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      font-size: 0.75rem;
    }

    .about-panel {
      background: linear-gradient(135deg, #ffffff 0%, #f0fdfa 100%);
      border: 1px solid #ccfbf1;
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .panel-item {
      padding: 14px 0;
      border-bottom: 1px solid #e6f4f2;
    }

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

    .panel-item-title {
      font-weight: 700;
      color: #134e4a;
      margin-bottom: 4px;
    }

    .panel-item-desc {
      font-size: 0.88rem;
      color: #475569;
    }

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

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .service-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 3px 8px;
      border-radius: 4px;
      margin-bottom: 12px;
      width: fit-content;
    }

    .service-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }

    .service-desc {
      font-size: 0.9rem;
      color: #475569;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .service-action {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .service-action:hover {
      color: var(--primary-dark);
      text-decoration: underline;
    }

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

    .process-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px 20px;
      text-align: center;
      position: relative;
    }

    .process-num {
      width: 44px;
      height: 44px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.2rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      box-shadow: 0 4px 10px rgba(12, 166, 148, 0.25);
    }

    .process-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .process-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 案例中心展示（含图片） */
    .case-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

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

    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .case-img-box {
      width: 100%;
      background: #e2e8f0;
      overflow: hidden;
    }

    .case-img-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img-box img {
      transform: scale(1.02);
    }

    .case-body {
      padding: 20px;
    }

    .case-cat {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      margin-bottom: 6px;
    }

    .case-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .case-desc {
      font-size: 0.9rem;
      color: #475569;
    }

    /* 对比评测表格 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #094038 0%, #0d5f53 100%);
      color: #ffffff;
      padding: 28px;
      border-radius: var(--radius);
      margin-bottom: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .eval-scores {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .score-badge {
      font-size: 2.8rem;
      font-weight: 900;
      color: #34d399;
      line-height: 1;
    }

    .score-label {
      font-size: 0.9rem;
      color: #cbd5e1;
    }

    .star-rating {
      color: #fbbf24;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .eval-table-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

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

    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #edf2f7;
    }

    .eval-table th {
      background: #f8fafc;
      font-size: 0.95rem;
      font-weight: 700;
      color: #334155;
    }

    .eval-table td {
      font-size: 0.9rem;
      color: #475569;
    }

    .eval-table tr:hover td {
      background-color: #f0fdfa;
    }

    .td-highlight {
      color: var(--primary-dark) !important;
      font-weight: 600;
      background: #f7fcfa;
    }

    /* 客户评价板块 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-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;
      transition: var(--transition);
    }

    .review-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }

    .review-stars {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 0.9rem;
    }

    .review-text {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 18px;
    }

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

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

    .user-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: #0f172a;
    }

    .user-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item:hover {
      border-color: #cbd5e1;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 22px;
      background: none;
      border: none;
      font-size: 1.02rem;
      font-weight: 700;
      color: #0f172a;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background-color: #fbfdfc;
    }

    .faq-answer-inner {
      padding: 0 22px 18px;
      font-size: 0.92rem;
      color: #475569;
      line-height: 1.7;
    }

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

    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* 需求匹配与联系我们表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: #0f172a;
    }

    .contact-list {
      list-style: none;
      margin-top: 20px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .contact-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: #334155;
    }

    .contact-badge {
      width: 28px;
      height: 28px;
      background: var(--primary-light);
      color: var(--primary-dark);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.8rem;
      font-weight: 700;
      flex-shrink: 0;
    }

    .qr-card {
      margin-top: 24px;
      display: flex;
      align-items: center;
      gap: 16px;
      background: #f8fafc;
      padding: 16px;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
      width: fit-content;
    }

    .qr-card img {
      width: 86px;
      height: 86px;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: #1e293b;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      font-size: 0.92rem;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      outline: none;
      transition: var(--transition);
      background: #ffffff;
      color: #1e293b;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(12, 166, 148, 0.15);
    }

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

    /* 资讯与百科 */
    .news-section-inner {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
    }

    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-tag-link {
      display: inline-block;
      font-size: 0.88rem;
      color: #0f766e;
      background: #f0fdfa;
      border: 1px solid #ccfbf1;
      padding: 6px 14px;
      border-radius: 6px;
      text-decoration: none;
      transition: var(--transition);
    }

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

    /* 宣传展示条（含素材图） */
    .banner-showcase {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .banner-box {
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #e2e8f0;
    }

    .banner-box img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 浮动客服入口 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.18);
      cursor: pointer;
      text-decoration: none;
      transition: var(--transition);
      border: none;
      font-size: 0.85rem;
      font-weight: 700;
    }

    .float-btn:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }

    .back-top-btn {
      background: #ffffff;
      color: #334155;
      border: 1px solid #cbd5e1;
    }

    .back-top-btn:hover {
      background: #f8fafc;
      color: var(--primary);
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 24px;
      margin-top: auto;
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.25rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .footer-col h5 {
      color: #f1f5f9;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 14px;
    }

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

    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.88rem;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: #34d399;
    }

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding: 20px 0;
      margin-bottom: 20px;
    }

    .friend-links-title {
      font-size: 0.85rem;
      font-weight: 600;
      color: #64748b;
      margin-bottom: 10px;
    }

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

    .friend-links-list a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.85rem;
      transition: var(--transition);
    }

    .friend-links-list a:hover {
      color: var(--accent-cyan);
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-bar {
        grid-template-columns: repeat(2, 1fr);
        margin-top: 20px;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }

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

      .nav-link {
        width: 100%;
        padding: 10px 0;
      }

      .mobile-menu-toggle {
        display: block;
      }

      .hero-h1 {
        font-size: 1.85rem;
      }

      .hero-subtitle {
        font-size: 1rem;
      }

      .about-grid, .contact-wrapper, .case-grid {
        grid-template-columns: 1fr;
      }

      .services-grid, .reviews-grid, .banner-showcase {
        grid-template-columns: 1fr;
      }

      .process-timeline {
        grid-template-columns: 1fr;
      }

      .metrics-bar {
        grid-template-columns: 1fr;
      }

      .footer-top {
        grid-template-columns: 1fr;
      }
    }