:root {
      --primary: #0d9488;
      --primary-dark: #0f766e;
      --primary-light: #ccfbf1;
      --accent: #0284c7;
      --accent-gradient: linear-gradient(135deg, #0d9488 0%, #0284c7 100%);
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 4px 16px -2px rgba(13, 148, 136, 0.12);
      --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
      --radius: 12px;
      --max-width: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

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

    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: 1.6;
      background-image: 
        radial-gradient(circle at 10% 10%, rgba(13, 148, 136, 0.04) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(2, 132, 199, 0.04) 0%, transparent 40%);
      background-attachment: fixed;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    /* 顶部导航 */
    .site-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);
      transition: all 0.3s ease;
    }

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

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

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

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

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

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
      transition: color 0.2s, background-color 0.2s;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--accent-gradient);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
    }

    .btn-primary:hover {
      box-shadow: 0 6px 18px rgba(13, 148, 136, 0.35);
      transform: translateY(-2px);
    }

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

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

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.88rem;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--text-main);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 70px 0 60px;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, rgba(204, 251, 241, 0.4) 0%, rgba(248, 250, 252, 0) 100%);
    }

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

    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #ffffff;
      border: 1px solid #99f6e4;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary-dark);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.3rem;
      line-height: 1.25;
      font-weight: 800;
      color: #042f2e;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 32px;
      line-height: 1.7;
    }

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

    .hero-btn-glow {
      font-size: 1.05rem;
      padding: 14px 32px;
      border-radius: 10px;
      background: linear-gradient(135deg, #0d9488 0%, #0369a1 100%);
      color: #ffffff;
      box-shadow: 0 8px 24px rgba(13, 148, 136, 0.35);
    }

    .hero-btn-glow:hover {
      box-shadow: 0 10px 28px rgba(13, 148, 136, 0.45);
      transform: translateY(-2px);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #99f6e4;
    }

    .stat-value {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

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

    /* 通用分节样式 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background: #f1f5f9;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      border-color: #5eead4;
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      font-size: 1.4rem;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-footer-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 16px;
      padding-top: 12px;
      border-top: 1px dashed var(--border-color);
    }

    .tag-item {
      font-size: 0.78rem;
      padding: 2px 8px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      color: var(--text-muted);
    }

    /* 场景矩阵卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 20px;
    }

    .scenario-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 20px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

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

    .scenario-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--accent);
      background: #e0f2fe;
      padding: 2px 8px;
      border-radius: 4px;
      margin-bottom: 10px;
      width: fit-content;
    }

    .scenario-name {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .scenario-detail {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 模型矩阵徽章云 */
    .models-chip-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 8px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #1e293b;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }

    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
      transform: scale(1.04);
    }

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

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

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table th.highlight,
    .compare-table td.highlight {
      background: rgba(204, 251, 241, 0.3);
      color: var(--primary-dark);
      font-weight: 600;
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 1.1rem;
      font-weight: 800;
      color: #f59e0b;
    }

    /* 流程步骤 */
    .process-grid {
      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: 24px;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--accent-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
      margin-bottom: 14px;
    }

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

    .process-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 案例展示区 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 30px;
    }

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

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

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      overflow: hidden;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-body {
      padding: 20px;
    }

    .case-category {
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 6px;
    }

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

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

    /* 客户评价网格 */
    .review-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;
    }

    .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: 16px;
      font-style: italic;
    }

    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 12px;
    }

    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .reviewer-name {
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .reviewer-role {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: all 0.2s;
    }

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

    .faq-question {
      width: 100%;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: none;
      border: none;
      text-align: left;
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s;
      color: var(--primary);
    }

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

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

    .faq-answer-inner {
      padding: 0 20px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 表单与需求匹配 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      max-width: 800px;
      margin: 0 auto;
      box-shadow: var(--shadow-md);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group-full {
      grid-column: span 2;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      background: #f8fafc;
      color: var(--text-main);
      transition: border-color 0.2s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
    }

    /* 资讯与文章列表 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 16px;
      display: block;
      transition: all 0.2s;
    }

    .article-item:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 联系与二维码 */
    .contact-card-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 30px;
      align-items: center;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

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

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .contact-info-item strong {
      color: var(--text-main);
      min-width: 90px;
    }

    .qr-box {
      text-align: center;
      padding: 20px;
      background: #f8fafc;
      border-radius: 12px;
      border: 1px solid var(--border-color);
    }

    .qr-box img {
      width: 150px;
      height: 150px;
      margin: 0 auto 12px;
      object-fit: contain;
      border-radius: 8px;
      background: #ffffff;
      padding: 6px;
      border: 1px solid var(--border-color);
    }

    .qr-tip {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px;
      border-top: 1px solid #1e293b;
    }

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

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

    .footer-brand h3 {
      color: #f8fafc;
      font-size: 1.3rem;
      margin-bottom: 12px;
    }

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

    .footer-col h4 {
      color: #f8fafc;
      font-size: 1rem;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.88rem;
    }

    .footer-links a {
      color: #94a3b8;
      transition: color 0.2s;
    }

    .footer-links a:hover {
      color: #38bdf8;
    }

    .friend-links-wrap {
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      margin-bottom: 24px;
      font-size: 0.85rem;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
    }

    .friend-links-wrap span {
      color: #cbd5e1;
      font-weight: 600;
    }

    .friend-links-wrap a {
      color: #94a3b8;
      padding: 2px 8px;
      background: #1e293b;
      border-radius: 4px;
      transition: all 0.2s;
    }

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

    .footer-bottom {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 浮动组件与返回顶部 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      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(--text-main);
      cursor: pointer;
      transition: all 0.25s;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .grid-4, .hero-stats-grid, .process-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .review-grid, .case-gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top-grid {
        grid-template-columns: 1fr 1fr;
      }
      .contact-card-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 1.75rem;
      }
      .section-title {
        font-size: 1.5rem;
      }
      .grid-3, .grid-2, .grid-4, .review-grid, .case-gallery-grid, .process-grid {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        padding: 12px;
      }
      .header-actions {
        display: none;
      }
    }