/* CSS Variables & Theme setup: Vibrant Emerald Green style */
    :root {
      --primary: #059669;
      --primary-emerald: #10b981;
      --primary-accent: #00c853;
      --primary-light: #ecfdf5;
      --primary-hover: #047857;
      --text-main: #0f172a;
      --text-sub: #334155;
      --text-muted: #64748b;
      --bg-main: #ffffff;
      --bg-alt: #f8fafc;
      --bg-card: #ffffff;
      --border-light: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 12px rgba(16, 185, 129, 0.08);
      --shadow-hover: 0 12px 24px rgba(16, 185, 129, 0.16);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --container-width: 1200px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      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-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background-color: var(--bg-main);
    }

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

    /* Header & Navigation */
    .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-light);
      box-shadow: var(--shadow-sm);
    }

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

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

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

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

    .brand-badge {
      font-size: 0.75rem;
      background: var(--primary-light);
      color: var(--primary);
      padding: 2px 8px;
      border-radius: 12px;
      font-weight: 600;
      border: 1px solid rgba(16, 185, 129, 0.2);
    }

    /* Navigation Rules: nav-links gap explicitly set to 0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 0;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text-sub);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: var(--transition);
      border-radius: var(--radius-sm);
    }

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

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

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: var(--primary-emerald);
      color: #ffffff;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: var(--bg-main);
      color: var(--primary);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      transition: var(--transition);
      border: 1px solid var(--primary-emerald);
    }

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

    /* Mobile Nav Toggle */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Hero Section - STRICTLY NO IMAGES */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 0%, #ecfdf5 0%, #ffffff 70%);
      text-align: center;
      border-bottom: 1px solid var(--border-light);
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid rgba(16, 185, 129, 0.3);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.875rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-sub);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    /* Hero Metrics Grid */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .metric-card:hover {
      border-color: var(--primary-emerald);
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .metric-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 6px;
    }

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

    /* Common Section Header */
    .section-padding {
      padding: 80px 0;
    }

    .section-bg-alt {
      background-color: var(--bg-alt);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-subtitle {
      color: var(--primary);
      font-weight: 700;
      text-transform: uppercase;
      font-size: 0.85rem;
      letter-spacing: 1.5px;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

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

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

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

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

    /* Standard Card Component */
    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      padding: 30px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .card-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      font-weight: bold;
    }

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

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

    /* Model Badges Grid */
    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-light);
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 600;
      color: var(--text-sub);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-tag:hover {
      border-color: var(--primary-emerald);
      color: var(--primary);
      background: var(--primary-light);
      transform: scale(1.05);
    }

    /* Image Display Media Elements */
    .media-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .media-card-img-wrapper {
      width: 100%;
      overflow: hidden;
      aspect-ratio: 16/9;
      background-color: var(--bg-alt);
    }

    .media-card-img-wrapper img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

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

    .media-card-content {
      padding: 24px;
    }

    /* Comparison Table Styling */
    .comparison-wrapper {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .rating-banner {
      background: linear-gradient(135deg, #059669 0%, #10b981 100%);
      color: #ffffff;
      padding: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-score {
      font-size: 2.2rem;
      font-weight: 800;
    }

    .rating-stars {
      color: #fbbf24;
      font-size: 1.5rem;
      margin-left: 8px;
    }

    .comparison-table-container {
      overflow-x: auto;
    }

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

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

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

    .comparison-table tr.highlight {
      background: var(--primary-light);
      font-weight: 600;
    }

    /* Process Step Cards */
    .step-card {
      position: relative;
      background: #ffffff;
      padding: 30px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 2.5rem;
      font-weight: 900;
      color: rgba(16, 185, 129, 0.2);
      position: absolute;
      top: 15px;
      right: 20px;
    }

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

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

    .faq-item:hover {
      border-color: var(--primary-emerald);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: var(--bg-alt);
      color: var(--text-sub);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 0 24px 20px;
      border-top: 1px solid var(--border-light);
    }

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

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

    /* User Review Cards */
    .review-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

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

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

    .review-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .review-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* Form Design */
    .form-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: var(--bg-alt);
      transition: var(--transition);
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--primary-emerald);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }

    /* News Articles Block */
    .news-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .news-item-link {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 20px;
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      text-decoration: none;
      color: var(--text-main);
      font-weight: 600;
      transition: var(--transition);
    }

    .news-item-link:hover {
      border-color: var(--primary-emerald);
      color: var(--primary);
      transform: translateX(4px);
    }

    /* Footer Styling */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.9rem;
    }

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

    .footer-brand h3 {
      color: #ffffff;
      font-size: 1.2rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      line-height: 1.6;
      margin-bottom: 16px;
    }

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

    .footer-links-list {
      list-style: none;
    }

    .footer-links-list li {
      margin-bottom: 10px;
    }

    .footer-links-list a {
      color: #94a3b8;
      text-decoration: none;
      transition: var(--transition);
    }

    .footer-links-list a:hover {
      color: var(--primary-emerald);
    }

    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friendship-links a {
      color: #94a3b8;
      text-decoration: none;
      background: rgba(255,255,255,0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
      transition: var(--transition);
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* Floating Widget */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .widget-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary-emerald);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
      cursor: pointer;
      text-decoration: none;
      position: relative;
      transition: var(--transition);
    }

    .widget-btn:hover {
      transform: scale(1.1);
    }

    .qr-popover {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: 0 8px 24px rgba(0,0,0,0.15);
      width: 160px;
      text-align: center;
      border: 1px solid var(--border-light);
    }

    .widget-btn:hover .qr-popover {
      display: block;
    }

    .qr-popover img {
      width: 100%;
      height: auto;
      border-radius: 4px;
    }

    .qr-popover span {
      display: block;
      font-size: 0.75rem;
      color: var(--text-main);
      margin-top: 6px;
      font-weight: 600;
    }

    /* Responsive Breakpoints */
    @media (max-width: 992px) {
      .cards-grid-4 { grid-template-columns: repeat(2, 1fr); }
      .cards-grid-3 { grid-template-columns: repeat(2, 1fr); }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.active { display: flex; }
      .nav-links li a { width: 100%; padding: 12px 16px; }
      .cards-grid-3, .cards-grid-2, .cards-grid-4 { grid-template-columns: 1fr; }
      .hero-title { font-size: 1.8rem; }
      .footer-grid { grid-template-columns: 1fr; }
      .rating-banner { flex-direction: column; text-align: center; }
    }