/* CSS Root Vars & General Reset */
    :root {
      --primary-blue: #2563eb;
      --primary-hover: #1d4ed8;
      --accent-cyan: #06b6d4;
      --accent-purple: #7c3aed;
      --bg-light: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-lg: 0 10px 25px rgba(37,99,235,0.1);
      --radius-md: 12px;
      --radius-lg: 20px;
    }

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

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

    body {
      overflow-x: hidden;
    }

    a {
      color: var(--primary-blue);
      text-decoration: none;
      transition: all 0.25s ease;
    }

    a:hover {
      color: var(--primary-hover);
    }

    /* Container Layout Alignment */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Header & Navigation */
    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);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    /* Standard rule requirement: .nav-links gap must be 0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary-blue);
      background-color: rgba(37, 99, 235, 0.05);
      border-radius: 6px;
    }

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

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-blue), var(--accent-purple));
      color: #ffffff !important;
      padding: 10px 22px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 14px;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    }

    .btn-outline {
      border: 1.5px solid var(--primary-blue);
      color: var(--primary-blue) !important;
      padding: 9px 20px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 14px;
      background: transparent;
      transition: all 0.2s ease;
    }

    .btn-outline:hover {
      background: rgba(37, 99, 235, 0.08);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Hero Section (No images allowed) */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 20%, rgba(6, 182, 212, 0.12) 0%, rgba(37, 99, 235, 0.05) 50%, rgba(255, 255, 255, 0) 100%);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: rgba(37, 99, 235, 0.1);
      color: var(--primary-blue);
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 24px;
      border: 1px solid rgba(37, 99, 235, 0.2);
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
      margin-bottom: 20px;
      line-height: 1.25;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-cta-group .btn-official {
      background: linear-gradient(135deg, #059669, #10b981);
      color: #fff !important;
      padding: 14px 32px;
      border-radius: 50px;
      font-size: 16px;
      font-weight: 700;
      box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
    }

    .hero-cta-group .btn-official:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 24px rgba(16, 185, 129, 0.4);
    }

    /* Section Styles */
    section {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-tag {
      color: var(--accent-cyan);
      font-weight: 700;
      text-transform: uppercase;
      font-size: 13px;
      letter-spacing: 1.5px;
      display: block;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      color: var(--text-main);
      font-weight: 700;
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 1rem;
      margin-top: 10px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    /* Data Cards Metric Bar */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }

    .metric-card {
      background: var(--bg-card);
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      text-align: center;
      transition: transform 0.2s ease;
    }

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

    .metric-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary-blue);
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    /* General Card Grids */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.3s ease;
      position: relative;
    }

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

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(37, 99, 235, 0.1);
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* Models Cloud Tag */
    .models-tag-cloud {
      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: 30px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      background: var(--primary-blue);
      color: #fff;
      border-color: var(--primary-blue);
    }

    /* Process Steps */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .step-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius-md);
      position: relative;
    }

    .step-num {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(37, 99, 235, 0.2);
      position: absolute;
      top: 16px;
      right: 20px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* Comparison Table */
    .comparison-table-wrapper {
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    table.comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

    table.comp-table th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--text-main);
    }

    table.comp-table tr.highlight-row {
      background: rgba(37, 99, 235, 0.04);
      font-weight: 600;
    }

    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fef3c7;
      color: #92400e;
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 14px;
    }

    /* Reviews Grid */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-blue), var(--accent-cyan));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .review-user h4 {
      font-size: 1rem;
      font-weight: 700;
    }

    .review-user span {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .review-body {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background: #f8fafc;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
      display: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(180deg);
    }

    .faq-toggle-icon {
      transition: transform 0.2s ease;
    }

    /* Images Showcase */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .showcase-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .showcase-item img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .showcase-info {
      padding: 16px;
    }

    .showcase-info h4 {
      font-size: 1rem;
      margin-bottom: 6px;
    }

    .showcase-info p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* Form Container */
    .form-container {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full-width {
      grid-column: span 2;
    }

    .form-group label {
      font-weight: 600;
      font-size: 0.9rem;
      color: var(--text-main);
    }

    .form-group input, .form-group select, .form-group textarea {
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
      border-color: var(--primary-blue);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    .contact-info-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      margin-top: 40px;
      text-align: center;
    }

    .contact-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .qr-img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      border-radius: 8px;
      margin: 12px auto 0;
      display: block;
      border: 1px solid var(--border-color);
    }

    /* Latest News / Articles Links */
    .articles-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 16px;
      margin-top: 20px;
    }

    .article-item {
      background: var(--bg-card);
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .article-item a {
      font-weight: 600;
      color: var(--text-main);
    }

    .article-item a:hover {
      color: var(--primary-blue);
    }

    /* Footer */
    footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px;
      font-size: 0.9rem;
    }

    .footer-inner {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 16px;
    }

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

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

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

    .footer-bottom {
      border-top: 1px solid #334155;
      padding-top: 24px;
      text-align: center;
      display: flex;
      flex-direction: column;
      gap: 12px;
      align-items: center;
    }

    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
    }

    .friendship-links a {
      color: #64748b;
    }

    .friendship-links a:hover {
      color: var(--accent-cyan);
    }

    /* Floating Widget */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--primary-blue);
      color: #fff;
      padding: 12px 18px;
      border-radius: 30px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
    }

    .float-kefu:hover {
      background: var(--primary-hover);
    }

    /* Responsive Design Adjustments */
    @media (max-width: 992px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px 0;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
    }