:root {
      --primary: #1A365D;
      --accent: #E53E3E;
      --secondary: #DD6B20;
      --highlight: #3182CE;
      --bg-page: #F7FAFC;
      --bg-card: #FFFFFF;
      --text-main: #2D3748;
      --text-muted: #718096;
      --border-color: #E2E8F0;
      --container-width: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    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;
    }
    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }
    header.site-header {
      position: sticky;
      top: 0;
      background: #FFFFFF;
      border-bottom: 2px solid var(--accent);
      z-index: 1000;
      box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 40px;
      width: auto;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text-main);
      text-decoration: none;
      font-weight: 600;
      font-size: 15px;
      transition: color 0.2s, background-color 0.2s;
      border-radius: 4px;
    }
    .nav-links a:hover {
      color: var(--accent);
      background-color: #FFF5F5;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-block;
      padding: 10px 20px;
      font-size: 15px;
      font-weight: 700;
      text-align: center;
      text-decoration: none;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.2s ease-in-out;
      border: 2px solid transparent;
    }
    .btn-primary {
      background-color: var(--accent);
      color: #FFFFFF;
    }
    .btn-primary:hover {
      background-color: #C53030;
      box-shadow: 0 4px 12px rgba(229, 62, 62, 0.3);
    }
    .btn-contrast {
      background-color: var(--secondary);
      color: #FFFFFF;
    }
    .btn-contrast:hover {
      background-color: #C05621;
    }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #FFFFFF;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }
    .hero-section {
      background: linear-gradient(135deg, #1A365D 0%, #2B6CB0 100%);
      color: #FFFFFF;
      padding: 70px 0 60px;
      position: relative;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-block;
      background: var(--secondary);
      color: #FFFFFF;
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 1px;
      margin-bottom: 20px;
      text-transform: uppercase;
    }
    .hero-title {
      font-size: 40px;
      line-height: 1.3;
      margin-bottom: 20px;
      font-weight: 900;
      color: #FFFFFF;
    }
    .hero-desc {
      font-size: 18px;
      line-height: 1.6;
      margin-bottom: 35px;
      color: #E2E8F0;
    }
    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
    }
    .stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -35px;
      position: relative;
      z-index: 10;
    }
    .stat-card {
      background: var(--bg-card);
      border-top: 4px solid var(--accent);
      border-radius: 8px;
      padding: 24px;
      box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
      text-align: center;
    }
    .stat-val {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary);
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 4px;
      font-weight: 600;
    }
    .section-spacing {
      padding: 80px 0;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }
    .section-tag {
      color: var(--accent);
      font-weight: 800;
      font-size: 14px;
      letter-spacing: 1px;
      text-transform: uppercase;
      display: block;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 32px;
      color: var(--primary);
      font-weight: 800;
      margin-bottom: 12px;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
    }
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .service-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 28px;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 20px -5px rgba(0, 0, 0, 0.08);
      border-color: var(--secondary);
    }
    .service-title {
      font-size: 20px;
      color: var(--primary);
      margin-bottom: 12px;
      font-weight: 700;
    }
    .service-text {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.6;
    }
    .models-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }
    .model-badge {
      background: #EDF2F7;
      border: 1px solid #CBD5E0;
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
    }
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .flow-step-card {
      background: #FFFFFF;
      padding: 24px;
      border-radius: 8px;
      border-left: 4px solid var(--highlight);
      box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    }
    .flow-step-num {
      font-size: 24px;
      font-weight: 900;
      color: var(--highlight);
      margin-bottom: 8px;
    }
    .flow-step-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .compare-container {
      background: #FFFFFF;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
      overflow-x: auto;
    }
    .score-banner {
      background: linear-gradient(90deg, #DD6B20, #E53E3E);
      color: #FFFFFF;
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .score-banner-title {
      font-size: 20px;
      font-weight: 800;
    }
    .score-banner-value {
      font-size: 24px;
      font-weight: 900;
      background: rgba(255, 255, 255, 0.2);
      padding: 4px 16px;
      border-radius: 20px;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }
    .compare-table th {
      background-color: #F7FAFC;
      color: var(--primary);
      font-weight: 700;
    }
    .highlight-col {
      background-color: #FFF5F5;
      font-weight: 700;
      color: var(--accent);
    }
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 16px;
      color: var(--primary);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
    }
    .faq-question:hover {
      background: #F7FAFC;
    }
    .faq-answer {
      padding: 0 24px 18px;
      font-size: 14px;
      color: var(--text-main);
      display: none;
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .form-box {
      background: #FFFFFF;
      border-top: 4px solid var(--secondary);
      border-radius: 8px;
      padding: 40px;
      box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
      max-width: 800px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      margin-bottom: 8px;
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 14px;
      background: #F7FAFC;
      color: var(--text-main);
    }
    .form-control:focus {
      outline: none;
      border-color: var(--accent);
      background: #FFFFFF;
    }
    .media-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 40px;
    }
    .media-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
    }
    .media-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      display: block;
    }
    .media-card-content {
      padding: 16px;
    }
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 20px;
    }
    .article-link-item {
      display: inline-block;
      padding: 8px 16px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      text-decoration: none;
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
    }
    .article-link-item:hover {
      border-color: var(--accent);
      color: var(--accent);
    }
    .site-footer {
      background: #1A202C;
      color: #E2E8F0;
      padding: 60px 0 30px;
      margin-top: 60px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 16px;
      margin-bottom: 20px;
      font-weight: 700;
    }
    .footer-col p {
      font-size: 13px;
      line-height: 1.8;
      color: #CBD5E0;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul a {
      color: #CBD5E0;
      text-decoration: none;
      font-size: 13px;
      transition: color 0.2s;
    }
    .footer-col ul a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid #2D3748;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #A0AEC0;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-bottom: 16px;
    }
    .friend-links a {
      color: #CBD5E0;
      text-decoration: none;
      font-size: 12px;
    }
    .friend-links a:hover {
      color: #FFFFFF;
    }
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      background: #FFFFFF;
      border: 2px solid var(--accent);
      border-radius: 8px;
      padding: 12px;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
      text-align: center;
      z-index: 9999;
      width: 130px;
    }
    .float-service img {
      width: 100px;
      height: 100px;
      display: block;
      margin: 0 auto 6px;
    }
    .float-service-text {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
    }
    @media (max-width: 992px) {
      .card-grid, .card-grid-4, .stats-row, .flow-steps, .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .media-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        text-align: center;
        padding: 12px 0;
      }
      .card-grid, .card-grid-4, .stats-row, .flow-steps, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-desc {
        font-size: 15px;
      }
      .float-service {
        display: none;
      }
    }