:root {
      --primary: #0284c7;
      --primary-dark: #0369a1;
      --accent: #f59e0b;
      --accent-hover: #d97706;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --bg-soft: #f1f5f9;
      --border-color: #e2e8f0;
      --text-main: #0f172a;
      --text-secondary: #475569;
      --text-muted: #64748b;
      --container-width: 1200px;
      --border-radius: 12px;
      --box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
      --box-shadow-hover: 0 20px 30px -10px rgba(2, 132, 199, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.06);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    *, *::before, *::after {
      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, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    ul, ol {
      list-style: none;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .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: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-wrap .ai-page-logo {
      height: 42px;
      width: auto;
    }

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

    .brand-text span {
      color: var(--primary);
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-secondary);
      padding: 10px 14px;
      border-radius: 6px;
      display: inline-block;
    }

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

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

    .btn-header-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #ffffff !important;
      padding: 9px 20px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
    }

    .btn-header-cta:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      padding: 8px;
      cursor: pointer;
      color: var(--text-main);
    }

    .section-spacing {
      padding: 72px 0;
    }

    .section-title-wrap {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 48px;
    }

    .section-subtitle {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background-color: #e0f2fe;
      padding: 5px 14px;
      border-radius: 999px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    .hero-section {
      background: radial-gradient(circle at 10% 20%, #e0f2fe 0%, #f8fafc 90%);
      padding: 96px 0 80px;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 48px;
      align-items: center;
    }

    .hero-h1 {
      font-size: 2.4rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-h1 .highlight {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .hero-p {
      font-size: 1.15rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .btn-main-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: linear-gradient(135deg, #0284c7, #0369a1);
      color: #ffffff;
      font-weight: 700;
      font-size: 1.1rem;
      padding: 14px 34px;
      border-radius: 10px;
      box-shadow: 0 8px 20px -3px rgba(2, 132, 199, 0.4);
    }

    .btn-main-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px -3px rgba(2, 132, 199, 0.5);
    }

    .btn-main-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      color: var(--text-main);
      font-weight: 600;
      font-size: 1.05rem;
      padding: 13px 28px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      box-shadow: var(--box-shadow);
    }

    .btn-main-secondary:hover {
      background: var(--bg-soft);
      border-color: #cbd5e1;
    }

    .hero-visual-card {
      background: #ffffff;
      border: 1px solid #bae6fd;
      border-radius: 16px;
      padding: 28px;
      box-shadow: 0 20px 40px -15px rgba(2, 132, 199, 0.15);
      position: relative;
    }

    .card-head-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #f0fdf4;
      color: #16a34a;
      font-size: 0.8rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      margin-bottom: 16px;
    }

    .hero-stat-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-bottom: 24px;
    }

    .stat-box {
      background: var(--bg-soft);
      padding: 14px;
      border-radius: 10px;
      border-left: 4px solid var(--primary);
    }

    .stat-title {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 4px;
    }

    .stat-value {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .engine-stream {
      font-size: 0.85rem;
      color: var(--text-secondary);
      background: #eff6ff;
      border-radius: 8px;
      padding: 12px;
      line-height: 1.5;
    }

    .metrics-bar {
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 32px 0;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .metric-card h3 {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }

    .metric-card p {
      font-size: 0.95rem;
      color: var(--text-secondary);
      font-weight: 500;
    }

    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius);
      padding: 28px;
      transition: var(--transition);
      box-shadow: var(--box-shadow);
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--box-shadow-hover);
      border-color: #7dd3fc;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #e0f2fe;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 18px;
      font-weight: 800;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.6;
      flex-grow: 1;
    }

    .model-chip-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 36px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 8px 16px;
      border-radius: 24px;
      font-size: 0.85rem;
      font-weight: 600;
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
      transition: var(--transition);
    }

    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f0f9ff;
    }

    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-box {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius);
      padding: 24px;
      text-align: left;
      box-shadow: var(--box-shadow);
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
      margin-bottom: 14px;
    }

    .step-box h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-box p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.5;
    }

    .table-container {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius);
      overflow-x: auto;
      box-shadow: var(--box-shadow);
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .eval-table th {
      background: var(--bg-soft);
      font-weight: 700;
      color: var(--text-main);
    }

    .eval-table tr:hover td {
      background: #f8fafc;
    }

    .eval-highlight {
      background: #f0f9ff;
      font-weight: 700;
      color: var(--primary-dark);
    }

    .score-badge {
      display: inline-block;
      background: #fef3c7;
      color: #b45309;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 0.9rem;
    }

    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 32px;
    }

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

    .gallery-img-box {
      width: 100%;
      background: #e2e8f0;
    }

    .gallery-body {
      padding: 20px;
    }

    .gallery-body h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .gallery-body p {
      font-size: 0.9rem;
      color: var(--text-secondary);
    }

    .banner-wall-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .banner-wall-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
    }

    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .testi-text {
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.6;
      margin-bottom: 20px;
      position: relative;
    }

    .testi-text::before {
      content: "“";
      font-size: 2.2rem;
      line-height: 1;
      color: #93c5fd;
      display: block;
      margin-bottom: -10px;
    }

    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e0f2fe;
      color: var(--primary);
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }

    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
    }

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

    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: var(--box-shadow);
      transition: var(--transition);
    }

    .faq-header {
      padding: 18px 22px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      user-select: none;
    }

    .faq-header:hover {
      background-color: #f8fafc;
      color: var(--primary);
    }

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

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 22px;
      color: var(--text-secondary);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    .faq-item.active .faq-body {
      max-height: 300px;
      padding-bottom: 20px;
      transition: max-height 0.3s ease-in-out;
    }

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

    .contact-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius);
      padding: 40px;
      box-shadow: var(--box-shadow);
    }

    .contact-form-side h3, .contact-info-side h3 {
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
      background: #f8fafc;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .btn-submit {
      width: 100%;
      background: var(--primary);
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      padding: 13px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-submit:hover {
      background: var(--primary-dark);
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin: 24px 0;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-secondary);
    }

    .contact-info-item strong {
      color: var(--text-main);
      width: 110px;
    }

    .qr-box {
      border: 1px dashed var(--border-color);
      border-radius: 8px;
      padding: 16px;
      display: inline-block;
      text-align: center;
      background: var(--bg-soft);
      max-width: 180px;
    }

    .qr-box img {
      border-radius: 6px;
      margin: 0 auto 8px;
      max-width: 130px;
    }

    .articles-section {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-pill {
      background: var(--bg-soft);
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
    }

    .article-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #ffffff;
    }

    .dynamic-articles-box {
      background: var(--bg-soft);
      border-radius: 8px;
      padding: 18px;
      margin-bottom: 20px;
      font-size: 0.95rem;
    }

    .friendly-links-section {
      padding: 36px 0;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

    .friend-links-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 14px;
      color: var(--text-main);
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-list a {
      font-size: 0.9rem;
      color: var(--text-secondary);
      background: var(--bg-soft);
      padding: 6px 12px;
      border-radius: 6px;
      border: 1px solid var(--border-color);
    }

    .friend-links-list a:hover {
      color: var(--primary);
      border-color: var(--primary);
      background: #ffffff;
    }

    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .footer-col ul {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-col a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      cursor: pointer;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.05);
    }

    @media (max-width: 992px) {
      .hero-grid, .contact-grid {
        grid-template-columns: 1fr;
      }
      .card-grid-3, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-4, .banner-wall-grid, .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .header-actions .btn-header-cta {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        display: none;
        padding: 20px 0;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-menu.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
      }
      .nav-links a {
        width: 100%;
        text-align: center;
        padding: 12px;
      }
      .hero-h1 {
        font-size: 1.85rem;
      }
      .section-title {
        font-size: 1.65rem;
      }
      .metrics-grid, .card-grid-3, .card-grid-4, .testimonial-grid, .gallery-grid, .banner-wall-grid, .process-timeline {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      .hero-stat-list {
        grid-template-columns: 1fr;
      }
    }