:root {
      --primary-gradient: linear-gradient(135deg, #ff4d4d 0%, #f9cb28 25%, #22c55e 50%, #06b6d4 75%, #6366f1 100%);
      --rainbow-accent-1: #ef4444;
      --rainbow-accent-2: #f59e0b;
      --rainbow-accent-3: #10b981;
      --rainbow-accent-4: #06b6d4;
      --rainbow-accent-5: #6366f1;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
      --shadow-lg: 0 20px 35px -10px rgba(99, 102, 241, 0.12);
      --max-width: 1240px;
    }

    * {
      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;
    }

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

    /* Navigation */
    .header-site {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: var(--shadow-sm);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 20px;
      font-weight: 800;
      background: linear-gradient(90deg, #ef4444, #06b6d4, #6366f1);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text-muted);
      font-size: 14px;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      white-space: nowrap;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--rainbow-accent-5);
      background-color: rgba(99, 102, 241, 0.08);
    }

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

    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, #ef4444 0%, #3b82f6 50%, #8b5cf6 100%);
      border-radius: 30px;
      text-decoration: none;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .btn-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
    }

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

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

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

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 700;
      border-radius: 20px;
      background: linear-gradient(90deg, rgba(239,68,68,0.1), rgba(6,182,212,0.1), rgba(99,102,241,0.1));
      color: var(--rainbow-accent-5);
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto;
    }

    /* Hero Section (Strictly NO Images) */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.08) 0%, rgba(6, 182, 212, 0.05) 40%, rgba(248, 250, 252, 0) 70%);
      text-align: center;
    }

    .hero-h1 {
      font-size: 38px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #0f172a;
      letter-spacing: -1px;
    }

    .hero-h1-gradient {
      background: linear-gradient(90deg, #ef4444 0%, #f59e0b 25%, #10b981 50%, #06b6d4 75%, #6366f1 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 30px;
      font-weight: 400;
    }

    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-bottom: 36px;
    }

    .hero-badge-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

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

    .btn-hero-main {
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(90deg, #ef4444 0%, #06b6d4 50%, #6366f1 100%);
      border-radius: 40px;
      text-decoration: none;
      box-shadow: 0 8px 24px rgba(6, 182, 212, 0.35);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .btn-hero-main:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 30px rgba(6, 182, 212, 0.5);
    }

    .btn-hero-sub {
      padding: 14px 30px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: 40px;
      text-decoration: none;
      transition: all 0.2s ease;
    }

    .btn-hero-sub:hover {
      border-color: var(--rainbow-accent-5);
      color: var(--rainbow-accent-5);
      background: rgba(99, 102, 241, 0.04);
    }

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

    .metric-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px 20px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--primary-gradient);
    }

    .metric-num {
      font-size: 32px;
      font-weight: 900;
      color: var(--rainbow-accent-5);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Cards & Layout Grid */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(99, 102, 241, 0.3);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
      color: #ffffff;
    }

    .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;
    }

    /* Model Tags Cloud */
    .tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .tag-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .tag-item:hover {
      background: linear-gradient(90deg, rgba(239,68,68,0.1), rgba(6,182,212,0.1));
      border-color: var(--rainbow-accent-4);
      transform: translateY(-2px);
    }

    /* Comparison Section */
    .rating-banner {
      background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 32px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 24px;
      letter-spacing: 2px;
    }

    .rating-score {
      font-size: 42px;
      font-weight: 900;
      color: #22c55e;
      line-height: 1;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    table.custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    table.custom-table th,
    table.custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

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

    table.custom-table tr:last-child td {
      border-bottom: none;
    }

    .table-highlight {
      background: rgba(99, 102, 241, 0.04);
      font-weight: 600;
      color: var(--rainbow-accent-5);
    }

    /* Pricing & Token Compare */
    .price-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 28px;
      border: 2px solid var(--border-color);
      position: relative;
    }

    .price-card.featured {
      border-color: var(--rainbow-accent-4);
      box-shadow: var(--shadow-lg);
    }

    .price-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: linear-gradient(90deg, #ef4444, #f59e0b);
      color: #ffffff;
      font-size: 12px;
      font-weight: 700;
      padding: 3px 12px;
      border-radius: 12px;
    }

    /* Process steps */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
    }

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

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
    }

    /* Case Studies & Images */
    .case-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .img-wrapper {
      width: 100%;
      aspect-ratio: 16/9;
      background: #e2e8f0;
      overflow: hidden;
    }

    .ai-page-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

    .case-card:hover .ai-page-image {
      transform: scale(1.05);
    }

    .case-body {
      padding: 20px;
    }

    /* Reviews Section */
    .review-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    .avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ef4444, #6366f1);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
    }

    /* Articles Section */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

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

    .article-link {
      color: var(--rainbow-accent-5);
      text-decoration: none;
      font-weight: 600;
      display: inline-block;
      margin-top: 10px;
    }

    .article-link:hover {
      text-decoration: underline;
    }

    /* FAQ Accordion */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-answer {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      display: none;
      line-height: 1.7;
    }

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

    .faq-icon {
      transition: transform 0.3s;
      font-size: 18px;
    }

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

    /* Form Section */
    .form-wrapper {
      max-width: 680px;
      margin: 0 auto;
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--rainbow-accent-5);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

    .btn-submit {
      width: 100%;
      padding: 14px;
      background: linear-gradient(90deg, #ef4444, #06b6d4, #6366f1);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 16px;
      font-weight: 700;
      cursor: pointer;
      transition: opacity 0.2s;
    }

    .btn-submit:hover {
      opacity: 0.92;
    }

    /* Contact Details Grid */
    .contact-info-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      margin-bottom: 40px;
    }

    .contact-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
    }

    .qr-container {
      width: 120px;
      height: 120px;
      margin: 12px auto 0;
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-color);
    }

    .qr-container img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* Footer */
    .footer-site {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-inner {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }

    .footer-links-title {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 14px;
      transition: color 0.2s;
    }

    .friend-links a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }

    /* Floating Utilities */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 20px;
      z-index: 999;
      background: #ffffff;
      border-radius: 30px;
      padding: 10px 18px;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 600;
      font-size: 14px;
    }

    .float-kefu:hover {
      box-shadow: 0 14px 30px rgba(0, 0, 0, 0.2);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        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;
      }

      .mobile-menu-btn {
        display: block;
      }

      .hero-h1 {
        font-size: 28px;
      }
    }