:root {
      --primary: #0052d9;
      --primary-hover: #003cab;
      --accent: #00b42a;
      --text-main: #1d2129;
      --text-sub: #4e5969;
      --text-muted: #86909c;
      --bg-page: #f7f8fa;
      --bg-card: #ffffff;
      --bg-alt: #eef2f8;
      --border-color: #e5e6eb;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --max-width: 1200px;
      --transition: all 0.25s ease-in-out;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-hover);
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      color: var(--text-sub);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background-color: var(--bg-alt);
    }
    .nav-btn-group {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-left: 16px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff !important;
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.25);
    }
    .btn-secondary {
      background-color: #ffffff;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-secondary:hover {
      background-color: var(--bg-alt);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }
    .hero-section {
      background: linear-gradient(135deg, #ffffff 0%, #eef5ff 50%, #f0f7f4 100%);
      padding: 70px 0 60px;
      border-bottom: 1px solid var(--border-color);
      text-align: center;
    }
    .hero-inner {
      max-width: 860px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background-color: #e8f3ff;
      color: var(--primary);
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 20px;
      border: 1px solid #cbe0ff;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .btn-large {
      padding: 14px 34px;
      font-size: 1.05rem;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }
    .stat-card {
      background: #ffffff;
      padding: 20px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-sub);
    }
    section {
      padding: 70px 0;
    }
    .section-alt {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }
    .section-tag {
      color: var(--primary);
      font-weight: 700;
      font-size: 0.88rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-sub);
      line-height: 1.6;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
      border-color: #cbe0ff;
    }
    .card-icon {
      width: 48px;
      height: 48px;
      background-color: var(--bg-alt);
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
    }
    .card-title {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }
    .model-tags-container {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }
    .tag-item {
      background: var(--bg-alt);
      color: var(--text-main);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
      border: 1px solid #dfe5ef;
      transition: var(--transition);
    }
    .tag-item:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }
    .timeline-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
    }
    .step-title {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 0.9rem;
      color: var(--text-sub);
    }
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }
    .media-card-content {
      padding: 20px;
    }
    .table-container {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .custom-table th {
      background-color: var(--bg-alt);
      font-weight: 600;
      color: var(--text-main);
    }
    .custom-table tr:last-child td {
      border-bottom: none;
    }
    .rating-badge {
      background: #fff7e8;
      color: #ff7d00;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      border: 1px solid #ffe4ba;
    }
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .review-avatar {
      width: 44px;
      height: 44px;
      background: var(--bg-alt);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .review-meta h4 {
      font-size: 1rem;
      color: var(--text-main);
    }
    .review-meta span {
      font-size: 0.82rem;
      color: var(--text-muted);
    }
    .review-text {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
    }
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-sub);
      font-size: 0.95rem;
      line-height: 1.6;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-icon {
      transition: var(--transition);
      font-weight: 400;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
    }
    .contact-card, .form-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
      margin-bottom: 20px;
    }
    .contact-icon {
      width: 36px;
      height: 36px;
      background: var(--bg-alt);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      flex-shrink: 0;
    }
    .contact-details h4 {
      font-size: 0.95rem;
      color: var(--text-main);
      margin-bottom: 2px;
    }
    .contact-details p {
      font-size: 0.9rem;
      color: var(--text-sub);
    }
    .qrcode-box {
      margin-top: 24px;
      padding: 16px;
      background: var(--bg-page);
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      gap: 16px;
    }
    .qrcode-box img {
      width: 90px;
      height: 90px;
      object-fit: cover;
      border-radius: 4px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 500;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      background-color: #ffffff;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 82, 217, 0.1);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .article-box {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }
    .article-links {
      list-style: none;
      margin-top: 14px;
    }
    .article-links li {
      margin-bottom: 10px;
      font-size: 0.92rem;
    }
    .site-footer {
      background-color: #1d2129;
      color: #c9cdd4;
      padding: 50px 0 24px;
      border-top: 1px solid #333842;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-col p {
      font-size: 0.88rem;
      line-height: 1.6;
      color: #86909c;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 8px;
    }
    .footer-links li a {
      color: #c9cdd4;
      font-size: 0.88rem;
    }
    .footer-links li a:hover {
      color: #ffffff;
    }
    .friend-links-area {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links-area a {
      color: #86909c;
      font-size: 0.85rem;
    }
    .friend-links-area a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid #2d323c;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #86909c;
    }
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      border-radius: 50%;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      cursor: pointer;
      transition: var(--transition);
      font-size: 1.1rem;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
    }
    @media (max-width: 992px) {
      .stats-grid, .grid-4, .timeline-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .banner-gallery, .review-grid {
        grid-template-columns: 1fr;
      }
      .contact-layout, .articles-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .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;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        width: 100%;
        padding: 12px 0;
      }
      .nav-btn-group {
        display: none;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .stats-grid, .grid-4, .timeline-steps {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }