:root {
      --primary-color: #059669;
      --primary-light: #10b981;
      --primary-bright: #00d26a;
      --primary-tint: #ecfdf5;
      --primary-pale: #f0fdf4;
      --dark-text: #0f172a;
      --text-sub: #334155;
      --text-muted: #64748b;
      --border-color: #d1fae5;
      --border-light: #e2e8f0;
      --card-bg: #ffffff;
      --page-bg: #f8fafc;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 25px -5px rgba(5, 150, 105, 0.12), 0 8px 10px -6px rgba(5, 150, 105, 0.08);
      --radius: 12px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--page-bg);
      color: var(--dark-text);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at top center, #ecfdf5 0%, #f8fafc 40%, #f1f5f9 100%);
      color: var(--dark-text);
      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 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-area img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

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

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

    .nav-links li a {
      text-decoration: none;
      color: var(--text-sub);
      font-size: 0.92rem;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: 6px;
      transition: var(--transition);
      display: inline-block;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.92rem;
      padding: 9px 20px;
      border-radius: 8px;
      text-decoration: none;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #059669, #047857);
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45);
    }

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

    .btn-outline:hover {
      background: var(--primary-tint);
      color: #047857;
    }

    .btn-lg {
      padding: 13px 28px;
      font-size: 1.05rem;
      border-radius: 10px;
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .nav-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--dark-text);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 64px 0 70px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #e6fffa;
      border: 1px solid #99f6e4;
      color: #0f766e;
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary-bright);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary-bright);
    }

    h1.hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--dark-text);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span.text-highlight {
      color: var(--primary-color);
      position: relative;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.12rem;
      color: var(--text-sub);
      max-width: 780px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: 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;
    }

    .stat-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px 16px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }

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

    .stat-number {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 4px;
      line-height: 1.2;
    }

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

    /* 通用Section */
    section {
      padding: 64px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 44px;
    }

    .section-tag {
      color: var(--primary-color);
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 8px;
      display: inline-block;
    }

    h2.section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--dark-text);
      line-height: 1.3;
      margin-bottom: 12px;
    }

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

    /* 品牌模型支持标带 */
    .model-tape {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 24px 0;
      overflow: hidden;
    }

    .model-tape-title {
      font-size: 0.85rem;
      text-align: center;
      color: var(--text-muted);
      margin-bottom: 16px;
      font-weight: 600;
      letter-spacing: 1px;
    }

    .model-chips {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-chip {
      background: var(--primary-pale);
      border: 1px solid var(--border-color);
      color: #065f46;
      font-size: 0.8rem;
      padding: 5px 12px;
      border-radius: 6px;
      font-weight: 500;
    }

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

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

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

    .card-icon {
      width: 44px;
      height: 44px;
      background: var(--primary-tint);
      color: var(--primary-color);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 16px;
      font-weight: bold;
    }

    .card h3 {
      font-size: 1.2rem;
      color: var(--dark-text);
      margin-bottom: 10px;
      font-weight: 600;
    }

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

    /* 场景分类标签组 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }

    .scene-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 18px;
      border-radius: 10px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .scene-box:hover {
      border-color: var(--primary-color);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }

    .scene-box h4 {
      color: var(--primary-color);
      font-size: 1.05rem;
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .scene-box p {
      font-size: 0.85rem;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 图文混排展区 */
    .media-block {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      margin-bottom: 36px;
    }

    .media-block.reverse {
      grid-template-columns: 1fr 1fr;
    }

    .media-block.reverse .media-content {
      order: 1;
    }

    .media-block.reverse .media-figure {
      order: 2;
    }

    .media-content {
      padding: 40px;
    }

    .media-content h3 {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 14px;
    }

    .media-content p {
      color: var(--text-sub);
      font-size: 0.95rem;
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .media-figure {
      background: #f1f5f9;
      width: 100%;
      height: 100%;
      min-height: 280px;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .media-figure img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.5s ease;
    }

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

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

    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 24px 20px;
      position: relative;
      text-align: center;
    }

    .step-badge {
      width: 38px;
      height: 38px;
      background: var(--primary-light);
      color: #ffffff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 1rem;
    }

    .step-item h3 {
      font-size: 1.1rem;
      margin-bottom: 10px;
    }

    .step-item p {
      font-size: 0.88rem;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 对比表格 */
    .comparison-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
      overflow-x: auto;
      padding: 8px;
    }

    .rating-banner {
      background: linear-gradient(90deg, #ecfdf5, #d1fae5);
      padding: 18px 24px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
      flex-wrap: wrap;
      gap: 12px;
    }

    .rating-left {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .rating-score {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary-color);
      line-height: 1;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.2rem;
      font-weight: 600;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

    .compare-table th, .compare-table td {
      padding: 14px 18px;
      border-bottom: 1px solid #f1f5f9;
    }

    .compare-table th {
      background: #f8fafc;
      color: var(--dark-text);
      font-weight: 600;
    }

    .compare-table tr:hover td {
      background: #fafafa;
    }

    .highlight-col {
      background: rgba(236, 253, 245, 0.4);
      font-weight: 600;
      color: #065f46;
    }

    /* 用户评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 18px;
      font-style: italic;
    }

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

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

    .review-name {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--dark-text);
    }

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

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: 10px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: var(--primary-light);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 22px;
      cursor: pointer;
      font-weight: 600;
      font-size: 1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      color: var(--dark-text);
    }

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

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

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

    .faq-answer {
      padding: 0 22px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-sub);
      font-size: 0.92rem;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      padding: 0 22px 18px;
      max-height: 250px;
    }

    /* 需求匹配与表单 */
    .form-section-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      padding: 40px;
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .form-info h3 {
      font-size: 1.7rem;
      margin-bottom: 14px;
      color: var(--dark-text);
    }

    .form-info p {
      color: var(--text-sub);
      font-size: 0.95rem;
      line-height: 1.6;
      margin-bottom: 24px;
    }

    .form-contact-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .form-contact-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.92rem;
      color: var(--text-sub);
    }

    .consult-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--dark-text);
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-light);
      border-radius: 8px;
      font-size: 0.92rem;
      outline: none;
      transition: var(--transition);
      background-color: #fafbfc;
    }

    .form-control:focus {
      border-color: var(--primary-light);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 85px;
    }

    /* 资讯与友情链接 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-card h4 {
      font-size: 1.05rem;
      margin-bottom: 8px;
      line-height: 1.4;
    }

    .article-card h4 a {
      color: var(--dark-text);
      text-decoration: none;
      transition: var(--transition);
    }

    .article-card h4 a:hover {
      color: var(--primary-color);
    }

    .article-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
      margin-bottom: 14px;
    }

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

    .article-link:hover {
      text-decoration: underline;
    }

    /* 页脚 */
    footer.site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 56px 0 28px;
      border-top: 3px solid var(--primary-color);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer-col p {
      font-size: 0.88rem;
      line-height: 1.6;
      margin-bottom: 12px;
      color: #94a3b8;
    }

    .footer-col a {
      color: #94a3b8;
      text-decoration: none;
      transition: var(--transition);
      display: inline-block;
      margin-bottom: 8px;
      font-size: 0.88rem;
    }

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

    .footer-links-list {
      list-style: none;
    }

    .footer-qr-block {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }

    .footer-qr-block img {
      width: 105px;
      height: 105px;
      border-radius: 8px;
      background: #ffffff;
      padding: 4px;
    }

    .friendly-links-wrap {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      margin-bottom: 24px;
    }

    .friendly-links-title {
      font-size: 0.88rem;
      color: #cbd5e1;
      margin-bottom: 10px;
      font-weight: 600;
    }

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

    .friendly-links-items a {
      color: #94a3b8;
      font-size: 0.82rem;
      text-decoration: none;
      transition: var(--transition);
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.82rem;
      color: #64748b;
    }

    .footer-bottom a {
      color: #64748b;
      text-decoration: none;
    }

    .footer-bottom a:hover {
      color: #94a3b8;
    }

    /* 悬浮客服与返回顶部 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary-color);
      font-size: 1.1rem;
      transition: var(--transition);
      position: relative;
    }

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

    .float-qr-popover {
      position: absolute;
      right: 54px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 12px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-light);
      display: none;
      flex-direction: column;
      align-items: center;
      width: 140px;
      text-align: center;
    }

    .float-qr-popover img {
      width: 110px;
      height: 110px;
      border-radius: 6px;
      margin-bottom: 6px;
    }

    .float-qr-popover span {
      font-size: 0.78rem;
      color: var(--dark-text);
      font-weight: 600;
    }

    .float-kefu-trigger:hover .float-qr-popover {
      display: flex;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .feature-grid, .reviews-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scene-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .steps-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      h1.hero-title {
        font-size: 1.85rem;
      }
      .feature-grid, .scene-grid, .reviews-grid, .articles-grid, .steps-container {
        grid-template-columns: 1fr;
      }
      .media-block, .media-block.reverse {
        grid-template-columns: 1fr;
      }
      .media-block.reverse .media-content {
        order: 2;
      }
      .media-block.reverse .media-figure {
        order: 1;
      }
      .form-section-wrapper {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }