:root {
      --primary: #0d9488;
      --primary-hover: #0f766e;
      --primary-light: #f0fdfa;
      --primary-border: #99f6e4;
      --secondary: #0284c7;
      --dark: #0f172a;
      --text: #334155;
      --text-muted: #64748b;
      --bg: #f8fafc;
      --card-bg: #ffffff;
      --border: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 4px 12px rgba(13, 148, 136, 0.08);
      --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
      --radius: 12px;
      --transition: all 0.25s ease-in-out;
    }

    * {
      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, "Noto Sans", sans-serif;
      background: linear-gradient(180deg, #f0fdfa 0%, #f8fafc 400px, #ffffff 100%);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

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

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

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

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

    nav.main-nav {
      display: flex;
      align-items: center;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: var(--transition);
      border-radius: 6px;
    }

    .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;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 8px;
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      font-size: 0.95rem;
      border: 1px solid transparent;
      line-height: 1.2;
    }

    .btn-primary {
      background: linear-gradient(135deg, #0d9488 0%, #0284c7 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(13, 148, 136, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #0f766e 0%, #0369a1 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(13, 148, 136, 0.35);
    }

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

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

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

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

    /* 区域统一通用样式 */
    section {
      padding: 70px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }

    .badge-sub {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      color: var(--primary);
      border: 1px solid var(--primary-border);
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--dark);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 英雄首屏（严禁包含任何图片） */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at top center, rgba(13, 148, 136, 0.12) 0%, rgba(240, 253, 250, 0.6) 50%, rgba(255, 255, 255, 0) 100%);
      text-align: center;
      border-bottom: 1px solid var(--border);
    }

    .hero-inner {
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid var(--primary-border);
      border-radius: 30px;
      font-size: 0.9rem;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-badge-pill .pulse-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 0 0 rgba(13, 148, 136, 0.7);
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(13, 148, 136, 0.7); }
      70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(13, 148, 136, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(13, 148, 136, 0); }
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      color: var(--dark);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.6;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .hero-btn-main {
      padding: 14px 34px;
      font-size: 1.05rem;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 35px;
    }

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border);
      padding: 20px 16px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .metric-num {
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

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

    /* 平台核心模型跑马与标签 */
    .models-bar {
      padding: 24px 0;
      background: #ffffff;
      border-bottom: 1px solid var(--border);
    }

    .models-bar-inner {
      display: flex;
      flex-direction: column;
      gap: 12px;
      align-items: center;
    }

    .models-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
    }

    .model-chip {
      background: var(--bg);
      border: 1px solid var(--border);
      padding: 5px 12px;
      border-radius: 6px;
      font-size: 0.85rem;
      color: var(--text);
      font-weight: 500;
      transition: var(--transition);
    }

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

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

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

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary-border);
    }

    .card-icon-title {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .card-icon {
      width: 42px;
      height: 42px;
      border-radius: 8px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1.1rem;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark);
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .card-tag {
      font-size: 0.78rem;
      background: var(--bg);
      padding: 3px 8px;
      border-radius: 4px;
      color: var(--text-muted);
    }

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

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

    .step-number {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 8px;
    }

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

    /* 对比评测板块 */
    .rating-banner {
      background: linear-gradient(135deg, #0f766e 0%, #0369a1 100%);
      color: #ffffff;
      padding: 32px;
      border-radius: var(--radius);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
    }

    .rating-left h3 {
      font-size: 1.6rem;
      margin-bottom: 6px;
    }

    .rating-left p {
      opacity: 0.9;
      font-size: 0.95rem;
    }

    .rating-score-box {
      text-align: right;
    }

    .score-stars {
      color: #facc15;
      font-size: 1.4rem;
      margin-bottom: 4px;
    }

    .score-num {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1;
    }

    .score-num span {
      font-size: 1.2rem;
      font-weight: 400;
      opacity: 0.85;
    }

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

    table.compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
      min-width: 700px;
    }

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

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

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

    .td-highlight {
      background-color: var(--primary-light);
      font-weight: 600;
      color: var(--primary-hover);
    }

    .status-badge {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 0.8rem;
    }

    .status-badge.win {
      background: #ccfbf1;
      color: #0f766e;
    }

    .status-badge.normal {
      background: #f1f5f9;
      color: #64748b;
    }

    /* 案例展示 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 24px;
    }

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

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

    .case-media-box {
      width: 100%;
      height: 250px;
      overflow: hidden;
      background: #e2e8f0;
    }

    .case-media-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }

    .case-card:hover .case-media-box img {
      transform: scale(1.03);
    }

    .case-body {
      padding: 20px;
    }

    .case-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 6px;
    }

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

    .case-dual-row {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    /* 需求匹配与智能表单 */
    .form-wrapper-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .form-info-left h3 {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 12px;
    }

    .form-feature-list {
      list-style: none;
      margin: 24px 0;
    }

    .form-feature-list li {
      margin-bottom: 12px;
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text);
    }

    .form-feature-list li::before {
      content: "✓";
      color: var(--primary);
      font-weight: bold;
    }

    .contact-mini-card {
      background: var(--bg);
      padding: 16px;
      border-radius: 8px;
      font-size: 0.9rem;
      border-left: 4px solid var(--primary);
    }

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

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

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark);
    }

    .form-control {
      padding: 12px 14px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
      background: #ffffff;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
    }

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

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

    .comment-stars {
      color: #facc15;
      font-size: 0.95rem;
      margin-bottom: 12px;
    }

    .comment-text {
      font-size: 0.95rem;
      color: var(--text);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: normal;
    }

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

    .user-avatar-tag {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0d9488, #0284c7);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 0.9rem;
    }

    .user-info-text .name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--dark);
    }

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

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

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

    .faq-question {
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--dark);
      background: #ffffff;
      user-select: none;
    }

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

    .faq-arrow {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--primary);
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px dashed var(--border);
      padding-top: 14px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 资讯与百科 */
    .news-article-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .news-article-box h4 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 16px;
    }

    .news-dynamic-area {
      background: var(--bg);
      padding: 16px;
      border-radius: 6px;
      border: 1px dashed var(--border);
      margin-bottom: 16px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .articles-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .article-link-item {
      background: #ffffff;
      border: 1px solid var(--border);
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 0.9rem;
      color: var(--primary-hover);
      text-decoration: none;
      transition: var(--transition);
    }

    .article-link-item:hover {
      border-color: var(--primary);
      background: var(--primary-light);
    }

    /* 联系我们与加盟代理 */
    .partner-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }

    .contact-card, .partner-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .contact-card h4, .partner-card h4 {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 16px;
    }

    .qr-contact-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px solid var(--border);
    }

    .qr-contact-wrap img {
      width: 110px;
      height: 110px;
      border-radius: 6px;
      border: 1px solid var(--border);
      display: block;
    }

    .contact-info-list p {
      font-size: 0.95rem;
      margin-bottom: 8px;
      color: var(--text);
    }

    /* 友情链接与页脚 */
    footer.site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 20px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-col h5 {
      color: #f8fafc;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

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

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-wrap a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.88rem;
      transition: var(--transition);
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
    }

    .friend-links-wrap a:hover {
      color: #38bdf8;
      background: #334155;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    .ai-page-home-link {
      color: #38bdf8;
      text-decoration: none;
    }

    /* 浮动组件与返回顶部 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 25px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      color: var(--primary);
      text-decoration: none;
      font-weight: bold;
      transition: var(--transition);
    }

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

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .cards-grid,
      .testimonials-grid,
      .steps-flow {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-wrapper-box,
      .partner-grid,
      .footer-top-grid,
      .case-dual-row {
        grid-template-columns: 1fr;
      }
      .case-gallery-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .header-actions {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--border);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .cards-grid,
      .testimonials-grid,
      .steps-flow,
      .hero-metrics {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .rating-score-box {
        text-align: center;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
      }
    }