:root {
      --primary-color: #059669;
      --primary-light: #10b981;
      --primary-dark: #047857;
      --primary-bg: #f0fdf4;
      --accent-glow: rgba(16, 185, 129, 0.15);
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-white: #ffffff;
      --bg-light: #f8fafc;
      --border-color: #e2e8f0;
      --border-emerald: #a7f3d0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(5, 150, 105, 0.08);
      --shadow-lg: 0 16px 32px rgba(5, 150, 105, 0.12);
      --radius: 12px;
      --transition: all 0.3s 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, sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      width: 100%;
      margin: 0 auto;
      padding: 0 20px;
      box-sizing: border-box;
    }

    /* Header */
    .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);
      transition: var(--transition);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      text-decoration: none;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 500;
      padding: 8px 14px;
      font-size: 0.95rem;
      border-radius: 6px;
      transition: var(--transition);
    }
    .nav-links li a:hover {
      color: var(--primary-color);
      background: var(--primary-bg);
    }
    .ai-page-home-link {
      color: var(--primary-dark) !important;
      font-weight: 700 !important;
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.95rem;
      text-decoration: none;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(16, 185, 129, 0.4);
    }
    .btn-outline {
      background: #ffffff;
      color: var(--primary-dark);
      border-color: var(--primary-light);
    }
    .btn-outline:hover {
      background: var(--primary-bg);
    }

    .menu-toggle {
      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%, var(--primary-bg) 0%, var(--bg-white) 70%);
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background: var(--primary-bg);
      border: 1px solid var(--border-emerald);
      border-radius: 50px;
      color: var(--primary-dark);
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      max-width: 800px;
      margin: 0 auto 36px;
      font-size: 1.15rem;
      color: var(--text-muted);
    }
    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 960px;
      margin: 0 auto;
    }
    .metric-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .metric-card:hover {
      border-color: var(--primary-light);
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-val {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-color);
    }
    .metric-lbl {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Section Global */
    .section-padding {
      padding: 80px 0;
    }
    .bg-light-section {
      background-color: var(--bg-light);
    }
    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }
    .section-tag {
      color: var(--primary-color);
      font-weight: 700;
      text-transform: uppercase;
      font-size: 0.85rem;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 1.05rem;
    }

    /* Grid Layouts */
    .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

    /* Cards */
    .card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 28px;
      transition: var(--transition);
    }
    .card:hover {
      border-color: var(--border-emerald);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    /* Feature Card */
    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-bg);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .feature-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .feature-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    /* Models Cloud */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }
    .tag-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      transition: var(--transition);
    }
    .tag-item:hover {
      background: var(--primary-bg);
      border-color: var(--primary-light);
      color: var(--primary-dark);
    }

    /* Process steps */
    .step-card {
      position: relative;
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }
    .step-num {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--border-emerald);
      line-height: 1;
      margin-bottom: 12px;
    }

    /* Comparison Table */
    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }
    .comp-table th, .comp-table td {
      padding: 16px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .comp-table th {
      background: var(--bg-light);
      font-weight: 700;
      color: var(--text-main);
    }
    .comp-table tr.highlight-row {
      background: var(--primary-bg);
    }
    .comp-table td.highlight-cell {
      font-weight: 700;
      color: var(--primary-dark);
    }
    .rating-badge {
      display: inline-block;
      background: #fef08a;
      color: #854d0e;
      padding: 4px 10px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.85rem;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-header {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-header:hover {
      background: var(--primary-bg);
    }
    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #ffffff;
      color: var(--text-muted);
      font-size: 0.95rem;
      padding: 0 24px;
    }
    .faq-item.active .faq-body {
      max-height: 200px;
      padding: 0 24px 18px;
    }
    .faq-icon {
      font-weight: 400;
      font-size: 1.2rem;
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* Media & Promo Section */
    .media-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }
    .media-card {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #ffffff;
    }
    .ai-page-image {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }
    .media-content {
      padding: 16px;
    }

    /* Testimonials */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      color: var(--text-muted);
      font-size: 0.95rem;
      font-style: italic;
      margin-bottom: 20px;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-bg);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .user-info h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .user-info p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* Form */
    .form-wrap {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 700px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      margin-bottom: 6px;
      font-weight: 600;
      font-size: 0.9rem;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary-light);
      box-shadow: 0 0 0 3px var(--accent-glow);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* Footer & System Footer */
    .footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand {
      color: #ffffff;
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 16px;
      display: block;
    }
    .footer-desc {
      font-size: 0.9rem;
      line-height: 1.6;
    }
    .footer-title {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .qr-box img {
      width: 110px;
      height: 110px;
      border-radius: 6px;
      border: 2px solid #334155;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }
    .friend-links a {
      color: #64748b;
      text-decoration: none;
    }
    .friend-links a:hover {
      color: #94a3b8;
    }

    /* Floating Widget */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      box-shadow: 0 4px 14px rgba(0,0,0,0.15);
      cursor: pointer;
      font-size: 1.2rem;
      border: none;
      transition: var(--transition);
    }
    .float-btn:hover {
      transform: scale(1.1);
      background: var(--primary-dark);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .hero-metrics, .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links {
        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);
      }
      .nav-links.active { display: flex; }
      .menu-toggle { display: block; }
      .hero-title { font-size: 1.8rem; }
      .grid-2, .grid-3, .grid-4, .hero-metrics { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-btns { flex-direction: column; }
    }