/* CSS Standard & Light Bright Enterprise Theme Setup */
    :root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --accent: #059669;
      --accent-hover: #047857;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-subtle: #eff6ff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.03);
      --radius: 12px;
      --max-width: 1200px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s ease;
    }
    a:hover {
      color: var(--primary-hover);
    }

    /* Container Standard */
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    /* Mandatory Rule: .nav-links gap must be 0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0; 
    }
    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 6px;
      transition: all 0.2s ease;
    }
    .nav-links li a:hover {
      background-color: var(--bg-subtle);
      color: var(--primary);
    }

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

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.2s ease;
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff !important;
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #ffffff !important;
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
    }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary) !important;
      background-color: transparent;
    }
    .btn-outline:hover {
      background-color: var(--bg-subtle);
    }

    /* Sections Shared Styling */
    section {
      padding: 80px 0;
    }
    .section-title-wrap {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      background-color: var(--bg-subtle);
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* SECTION 1: Hero Section (NO IMAGES ALLOWED IN HERO) */
    .hero-section {
      background: linear-gradient(135deg, #ffffff 0%, #eff6ff 100%);
      padding: 90px 0 70px 0;
      border-bottom: 1px solid var(--border);
      text-align: center;
    }
    .hero-content {
      max-width: 860px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: 30px;
      font-size: 14px;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-h1 {
      font-size: 40px;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.6;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-btn-official {
      font-size: 16px;
      padding: 14px 32px;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-md);
    }
    .metric-item {
      text-align: center;
    }
    .metric-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
    .metric-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Grid Layouts */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    /* Card Component */
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #bfdbfe;
    }
    .card-icon {
      width: 48px;
      height: 48px;
      background-color: var(--bg-subtle);
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 18px;
    }
    .card-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 2: About Us & Platform Intro */
    .about-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 20px;
    }
    .tag-pill {
      background: var(--bg-main);
      border: 1px solid var(--border);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Table Component (Comparison & Token Pricing) */
    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 15px;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
    }
    .custom-table th {
      background-color: #f1f5f9;
      font-weight: 700;
      color: var(--text-main);
    }
    .custom-table tr:last-child td {
      border-bottom: none;
    }
    .custom-table tr:hover td {
      background-color: var(--bg-subtle);
    }

    /* Rating Highlight Box */
    .rating-banner {
      background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
      color: #ffffff;
      padding: 32px;
      border-radius: var(--radius);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
    }
    .rating-score {
      font-size: 48px;
      font-weight: 900;
      color: #fbbf24;
      line-height: 1;
    }
    .rating-stars {
      color: #fbbf24;
      font-size: 24px;
      margin-top: 6px;
    }

    /* Process Timeline */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin-bottom: 14px;
    }

    /* Image Media Assets */
    .ai-page-image {
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* Media Grid for Showcase */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 30px;
    }

    /* FAQ Accordion */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px;
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      transition: background-color 0.2s;
    }
    .faq-question:hover {
      background-color: var(--bg-subtle);
    }
    .faq-answer {
      padding: 0 20px 20px 20px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.6;
      display: none;
      border-top: 1px dashed var(--border);
      margin-top: 10px;
      padding-top: 16px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-toggle-icon {
      font-size: 18px;
      font-weight: 400;
      color: var(--primary);
    }

    /* User Reviews */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border);
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      background: var(--bg-subtle);
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .author-info h4 {
      font-size: 15px;
      font-weight: 700;
    }
    .author-info p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Form Section */
    .contact-form-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
      background: #ffffff;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    /* Articles / News List */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .article-item-card {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px;
    }

    /* Footer Safety & Consistency Rules */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      font-size: 14px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h3, .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 16px;
      font-weight: 700;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 12px;
    }
    .friendship-links a {
      color: #94a3b8;
      font-size: 13px;
    }
    .friendship-links a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      text-align: center;
      padding-top: 30px;
      border-top: 1px solid #1e293b;
      color: #64748b;
      font-size: 13px;
    }

    /* Floating Widget */
    .floating-kefu {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 99;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 12px;
      box-shadow: var(--shadow-lg);
      text-align: center;
      max-width: 140px;
    }
    .floating-kefu img {
      width: 100px;
      height: 100px;
      object-fit: cover;
      border-radius: 6px;
      margin-bottom: 6px;
    }
    .floating-kefu p {
      font-size: 12px;
      font-weight: 700;
      color: var(--text-main);
    }

    /* Responsive Adaptation */
    @media (max-width: 1024px) {
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .process-steps { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .header-inner { flex-direction: column; height: auto; padding: 15px 0; gap: 12px; }
      .nav-links { flex-wrap: wrap; justify-content: center; }
      .hero-h1 { font-size: 28px; }
      .hero-subtitle { font-size: 15px; }
      .grid-3, .grid-4, .reviews-grid, .articles-grid, .media-showcase-grid { grid-template-columns: 1fr; }
      .hero-metrics { grid-template-columns: 1fr; }
      .process-steps { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .rating-banner { flex-direction: column; text-align: center; gap: 16px; }
      .floating-kefu { display: none; }
    }