:root {
      --primary: #0052d9;
      --primary-hover: #003cab;
      --primary-light: #ecf2fe;
      --accent: #ff6b00;
      --accent-soft: #fff3e8;
      --text-main: #111827;
      --text-muted: #4b5563;
      --text-sub: #6b7280;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 82, 217, 0.08);
      --shadow-lg: 0 16px 36px rgba(0, 82, 217, 0.12);
      --radius: 12px;
      --transition: all 0.25s ease;
    }
    * {
      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, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 12px;
      transition: var(--transition);
      border-radius: 6px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background-color: var(--primary-light);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      background-color: var(--primary);
      color: #fff !important;
      padding: 9px 20px !important;
      border-radius: 8px !important;
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
    }
    .btn-nav-primary:hover {
      background-color: var(--primary-hover) !important;
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.25);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      padding: 6px 10px;
      font-size: 1.25rem;
      cursor: pointer;
      color: var(--text-main);
    }
    section {
      padding: 80px 0;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px auto;
    }
    .badge {
      display: inline-block;
      padding: 4px 14px;
      background-color: var(--primary-light);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 50px;
      margin-bottom: 12px;
    }
    .badge-accent {
      background-color: var(--accent-soft);
      color: var(--accent);
    }
    .section-header h2 {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .section-header p {
      font-size: 1.05rem;
      color: var(--text-muted);
    }
    .hero-section {
      padding: 100px 0 80px 0;
      background: radial-gradient(circle at 10% 20%, #edf4ff 0%, #ffffff 70%),
                  radial-gradient(circle at 90% 80%, #fff7ed 0%, #ffffff 70%);
      position: relative;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-title {
      font-size: 2.6rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-main {
      background-color: var(--accent);
      color: #ffffff;
      padding: 14px 34px;
      font-size: 1.1rem;
      font-weight: 700;
      border-radius: 8px;
      text-decoration: none;
      transition: var(--transition);
      box-shadow: 0 6px 18px rgba(255, 107, 0, 0.3);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-main:hover {
      background-color: #e05e00;
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(255, 107, 0, 0.4);
    }
    .btn-outline {
      background-color: #ffffff;
      color: var(--primary);
      border: 2px solid var(--primary);
      padding: 12px 30px;
      font-size: 1.1rem;
      font-weight: 700;
      border-radius: 8px;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
      transform: translateY(-2px);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }
    .stat-box {
      text-align: center;
      padding: 12px;
    }
    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      display: block;
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-sub);
      font-weight: 500;
    }
    .platform-intro-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .intro-card {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .intro-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .intro-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
    }
    .intro-card h3 {
      font-size: 1.25rem;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .intro-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .model-tags-container {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      margin-top: 36px;
    }
    .model-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 16px;
    }
    .model-tag {
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
      transition: var(--transition);
    }
    .model-tag:hover {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #b5d3fb;
    }
    .service-card h4 {
      font-size: 1.15rem;
      color: var(--text-main);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .workflow-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .step-index {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px auto;
    }
    .step-card h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .review-score-hero {
      background: linear-gradient(135deg, #0052d9, #003cab);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
    }
    .review-score-left h3 {
      font-size: 1.6rem;
      margin-bottom: 8px;
    }
    .review-score-right {
      text-align: right;
    }
    .score-digits {
      font-size: 3rem;
      font-weight: 900;
      color: #ffd04b;
      line-height: 1;
    }
    .score-max {
      font-size: 1.2rem;
      color: #ffffff;
      opacity: 0.8;
    }
    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    table.custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    table.custom-table th,
    table.custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    table.custom-table th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--text-main);
    }
    table.custom-table tr:hover {
      background: #f8fafc;
    }
    .text-success {
      color: #00a870;
      font-weight: 700;
    }
    .text-primary-strong {
      color: var(--primary);
      font-weight: 700;
    }
    .network-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .network-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }
    .network-card h4 {
      font-size: 1.1rem;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .network-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .cases-gallery {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-item {
      background: #ffffff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .case-item img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      display: block;
    }
    .case-info {
      padding: 20px;
    }
    .case-info h3 {
      font-size: 1.15rem;
      margin-bottom: 6px;
    }
    .case-info p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .testi-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .testi-name {
      font-weight: 700;
      color: var(--text-main);
      font-size: 1rem;
    }
    .testi-role {
      font-size: 0.8rem;
      color: var(--text-sub);
    }
    .testi-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 20px;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 1.1rem;
      color: var(--primary);
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    .faq-answer {
      display: none;
      padding: 0 20px 20px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px dashed var(--border-color);
      margin-top: -4px;
      padding-top: 14px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .article-box {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .article-box h3 {
      font-size: 1.15rem;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .article-list a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      transition: var(--transition);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .article-list a:hover {
      color: var(--primary);
      transform: translateX(4px);
    }
    .contact-form-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      padding: 40px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .contact-info-col h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }
    .contact-info-col p {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .contact-meta-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 0.95rem;
    }
    .contact-meta-item strong {
      color: var(--text-main);
      width: 90px;
    }
    .qr-box {
      margin-top: 24px;
      padding: 16px;
      background: var(--bg-page);
      border-radius: var(--radius);
      display: inline-block;
      text-align: center;
      border: 1px solid var(--border-color);
    }
    .qr-box img {
      width: 140px;
      height: 140px;
      display: block;
      margin-bottom: 8px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-weight: 600;
      margin-bottom: 6px;
      font-size: 0.95rem;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
      background-color: #f8fafc;
    }
    .form-control:focus {
      background-color: #fff;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 82, 217, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .btn-submit {
      width: 100%;
      background: var(--primary);
      color: #fff;
      border: none;
      padding: 14px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-submit:hover {
      background: var(--primary-hover);
      box-shadow: 0 6px 18px rgba(0, 82, 217, 0.25);
    }
    footer.site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 24px 0;
      color: var(--text-muted);
    }
    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: var(--text-main);
      font-size: 1.05rem;
      margin-bottom: 16px;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-col ul a {
      color: var(--text-sub);
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }
    .footer-col ul a:hover {
      color: var(--primary);
    }
    .friendly-links {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      margin-bottom: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      font-size: 0.85rem;
    }
    .friendly-links strong {
      color: var(--text-main);
    }
    .friendly-links a {
      color: var(--text-sub);
      text-decoration: none;
    }
    .friendly-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-sub);
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
      text-decoration: none;
      font-size: 1.2rem;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid var(--border-color);
    }
    .floating-btn:hover {
      background: var(--primary);
      color: #fff;
      transform: translateY(-2px);
    }
    .floating-qr-popover {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 150px;
      text-align: center;
    }
    .floating-qr-popover img {
      width: 100%;
      height: auto;
      display: block;
    }
    .floating-widget .qr-trigger:hover + .floating-qr-popover,
    .floating-qr-popover:hover {
      display: block;
    }
    @media (max-width: 992px) {
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .platform-intro-grid,
      .services-grid,
      .workflow-steps-grid,
      .network-grid,
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-form-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }
    @media (max-width: 640px) {
      .hero-title {
        font-size: 2rem;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .platform-intro-grid,
      .services-grid,
      .workflow-steps-grid,
      .network-grid,
      .cases-gallery,
      .testimonials-grid,
      .articles-grid,
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .review-score-hero {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .review-score-right {
        text-align: center;
      }
    }