/* Global Resets & High-Contrast Light Theme Variables */
    :root {
      --primary-color: #2563eb;
      --primary-hover: #1d4ed8;
      --primary-light: #eff6ff;
      --accent-color: #0284c7;
      --vivid-cyan: #06b6d4;
      --vivid-purple: #7c3aed;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-strong: #cbd5e1;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 12px 24px -4px rgba(37, 99, 235, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --container-max: 1200px;
    }

    * {
      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-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

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

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

    .container {
      width: 92%;
      max-width: var(--container-max);
      margin: 0 auto;
    }

    /* Section Styling */
    section {
      padding: 70px 0;
      position: relative;
    }

    section.alt-bg {
      background-color: var(--bg-alt);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      color: var(--primary-color);
      font-weight: 600;
      font-size: 0.85rem;
      border-radius: 20px;
      margin-bottom: 12px;
      border: 1px solid rgba(37, 99, 235, 0.2);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.02em;
      margin-bottom: 14px;
    }

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

    /* Header Nav */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }

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

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 16px;
    }

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

    .brand-name {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .main-nav a {
      color: var(--text-main);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 6px 10px;
      border-radius: var(--radius-sm);
    }

    .main-nav a:hover {
      background-color: var(--primary-light);
      color: var(--primary-color);
    }

    .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: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }

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

    .btn-secondary {
      background-color: #ffffff;
      color: var(--text-main) !important;
      border-color: var(--border-strong);
    }

    .btn-secondary:hover {
      background-color: var(--bg-alt);
      border-color: var(--text-muted);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Hero Section - STRICT NO IMAGES RULE */
    #hero {
      padding: 90px 0 80px 0;
      background: radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.08) 0%, rgba(6, 182, 212, 0.05) 50%, rgba(248, 250, 252, 1) 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: rgba(37, 99, 235, 0.1);
      border: 1px solid rgba(37, 99, 235, 0.25);
      border-radius: 30px;
      color: var(--primary-color);
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 24px;
    }

    h1.hero-h1 {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.03em;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 34px;
      line-height: 1.7;
    }

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

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

    .metric-card {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }

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

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

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

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

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

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 30px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      box-shadow: var(--shadow-lg);
      border-color: rgba(37, 99, 235, 0.3);
      transform: translateY(-4px);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary-color);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.2rem;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

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

    /* Tag Clouds for Supported Models */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-chip {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

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

    /* Media Image Styling */
    .ai-page-image {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* Steps Flow */
    .step-list {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .step-item {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-color);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px auto;
      font-weight: 700;
    }

    /* Comparison Table */
    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 16px;
      background: linear-gradient(135deg, #1e293b, #0f172a);
      color: #ffffff;
      padding: 16px 28px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
    }

    .rating-score {
      font-size: 1.8rem;
      font-weight: 900;
      color: #f59e0b;
    }

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

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

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

    table.comparison-table tr:hover {
      background-color: rgba(37, 99, 235, 0.02);
    }

    .text-highlight {
      color: var(--primary-color);
      font-weight: 700;
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background-color: #ffffff;
      color: var(--text-main);
    }

    .faq-answer {
      padding: 0 24px 20px 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      display: none;
      line-height: 1.6;
      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);
    }

    /* User Testimonials */
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .quote-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      font-style: italic;
    }

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

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-color);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .user-role {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* Contact & Form Section */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-list p {
      margin-bottom: 12px;
      font-size: 1rem;
      color: var(--text-muted);
    }

    .qr-box {
      margin-top: 20px;
      padding: 16px;
      background: var(--bg-alt);
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      border-radius: 8px;
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-strong);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

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

    /* Articles / News List */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .article-item {
      background: var(--bg-card);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    /* Footer Rules - High-Contrast Dark Accent or Light Accent explicitly declared */
    footer.site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      margin-top: auto;
      border-top: 1px solid #1e293b;
    }

    footer.site-footer a {
      color: #cbd5e1;
    }

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

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 18px;
      font-weight: 700;
    }

    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friendship-links a {
      background: #1e293b;
      padding: 6px 12px;
      border-radius: 4px;
      font-size: 0.85rem;
    }

    .copyright-bar {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.88rem;
      color: #64748b;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* Floating Widget & Back to top */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 20px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      border: none;
      font-size: 1.2rem;
    }

    /* Mobile Responsive Rules */
    @media (max-width: 992px) {
      .hero-metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .step-list { grid-template-columns: repeat(2, 1fr); }
      .contact-wrapper { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }

      .main-nav.active {
        display: flex;
      }

      .mobile-toggle { display: block; }
      h1.hero-h1 { font-size: 1.8rem; }
      .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
      .step-list { grid-template-columns: 1fr; }
      .article-links-grid { grid-template-columns: 1fr; }
    }