:root {
      --primary: #4338ca;
      --primary-light: #6366f1;
      --accent-pink: #ec4899;
      --accent-cyan: #06b6d4;
      --accent-amber: #f59e0b;
      --accent-emerald: #10b981;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-sub: #64748b;
      --border-color: #e2e8f0;
      --border-focus: #818cf8;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 12px 24px -4px rgba(67, 56, 202, 0.08), 0 4px 8px -2px rgba(0, 0, 0, 0.04);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --transition: all 0.25s ease-in-out;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-page);
      font-size: 16px;
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: linear-gradient(180deg, #f1f5f9 0%, #f8fafc 400px, #ffffff 100%);
      color: var(--text-main);
      min-height: 100vh;
    }

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .header-wrapper {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #1e1b4b, #4338ca 60%, #ec4899);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-links li a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: #eff6ff;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 9999px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, #4338ca, #6366f1 50%, #ec4899);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
      color: #ffffff;
    }

    .btn-secondary {
      background: #f1f5f9;
      color: var(--text-main);
      border-color: var(--border-color);
    }

    .btn-secondary:hover {
      background: #e2e8f0;
      color: var(--primary);
    }

    .btn-accent {
      background: linear-gradient(135deg, #ec4899, #f43f5e);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(236, 72, 153, 0.45);
      color: #ffffff;
    }

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

    .hero-section {
      padding: 80px 0 60px;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.12) 0%, rgba(236, 72, 153, 0.06) 45%, rgba(248, 250, 252, 0) 70%);
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #e0e7ff;
      color: #3730a3;
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
      border: 1px solid #c7d2fe;
    }

    .hero-title {
      font-size: clamp(2rem, 4.5vw, 3.25rem);
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 22px;
      color: #0f172a;
      letter-spacing: -0.8px;
    }

    .hero-title .highlight-text {
      background: linear-gradient(135deg, #4338ca, #6366f1 40%, #ec4899);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.75;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }

    .stat-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .stat-val {
      font-size: 2.2rem;
      font-weight: 800;
      color: #1e1b4b;
      margin-bottom: 4px;
      line-height: 1.2;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-sub);
      font-weight: 500;
    }

    .section-wrap {
      padding: 70px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.7);
    }

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

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: #eef2ff;
      padding: 4px 14px;
      border-radius: 9999px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 14px;
      line-height: 1.3;
    }

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

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #e0e7ff, #fce7f3);
      color: var(--primary);
      flex-shrink: 0;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #1e293b;
    }

    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #334155;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .rating-banner {
      background: linear-gradient(135deg, #312e81, #4338ca 60%, #831843);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      margin-bottom: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .score-number {
      font-size: 3.8rem;
      font-weight: 900;
      line-height: 1;
      color: #fde047;
    }

    .score-stars {
      font-size: 1.5rem;
      color: #facc15;
    }

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

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

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

    .custom-table th {
      background: #f8fafc;
      color: #1e293b;
      font-weight: 700;
    }

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

    .custom-table .highlight-col {
      background: #eef2ff;
      font-weight: 600;
      color: #3730a3;
    }

    .steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
      position: relative;
    }

    .step-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      position: relative;
      transition: var(--transition);
    }

    .step-box:hover {
      border-color: var(--primary-light);
      box-shadow: var(--shadow-md);
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      font-size: 1rem;
    }

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

    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .gallery-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .gallery-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .gallery-media {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .gallery-media img {
      width: 100%;
      height: auto;
      max-height: 240px;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

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

    .gallery-content {
      padding: 20px;
      flex-grow: 1;
    }

    .gallery-content h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: #1e293b;
    }

    .gallery-content p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-item:hover {
      border-color: #cbd5e1;
    }

    .faq-question {
      width: 100%;
      padding: 20px 24px;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 700;
      color: #1e293b;
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.4rem;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-question::after {
      content: "−";
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafafa;
    }

    .faq-answer p {
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }

    .review-text {
      font-size: 0.98rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #6366f1, #ec4899);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .reviewer-details h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: #0f172a;
    }

    .reviewer-details span {
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 44px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-col h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: #0f172a;
    }

    .contact-info-col p {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 28px;
      line-height: 1.7;
    }

    .contact-details-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 28px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: #334155;
    }

    .contact-item strong {
      color: #0f172a;
    }

    .qr-wrapper {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 16px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      width: fit-content;
    }

    .qr-wrapper img {
      width: 88px;
      height: 88px;
      border-radius: var(--radius-sm);
      object-fit: cover;
    }

    .qr-text {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .qr-text strong {
      display: block;
      color: #0f172a;
      margin-bottom: 4px;
    }

    .form-col form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

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

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: #334155;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--border-focus);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

    .articles-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
    }

    .article-links-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 16px;
      list-style: none;
      margin-top: 18px;
    }

    .article-links-list li a {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 12px 16px;
      background: #f8fafc;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .article-links-list li a:hover {
      background: #eef2ff;
      color: var(--primary);
      border-color: #c7d2fe;
    }

    .footer-wrapper {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

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

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

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-top: 12px;
      color: #94a3b8;
    }

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 0.85rem;
    }

    .friend-links-box span {
      color: #cbd5e1;
      font-weight: 600;
    }

    .friend-links-box a {
      color: #94a3b8;
    }

    .friend-links-box a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    .float-service-btn {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 990;
      background: linear-gradient(135deg, #4338ca, #ec4899);
      color: #ffffff;
      padding: 12px 20px;
      border-radius: 9999px;
      box-shadow: 0 8px 24px rgba(67, 56, 202, 0.35);
      font-weight: 700;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
      transition: var(--transition);
    }

    .float-service-btn:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 12px 28px rgba(67, 56, 202, 0.45);
      color: #ffffff;
    }

    @media (max-width: 992px) {
      .form-layout {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
      }
    }