:root {
      --primary: #1d4ed8;
      --primary-dark: #1e3a8a;
      --primary-light: #eff6ff;
      --accent: #0284c7;
      --accent-bright: #06b6d4;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(29, 78, 216, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 20px 30px -10px rgba(30, 58, 138, 0.15);
      --radius: 12px;
      --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;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

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

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

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
    }

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

    .header-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: 8px;
      cursor: pointer;
      border: none;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(29, 78, 216, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(29, 78, 216, 0.4);
    }

    .btn-secondary {
      background-color: var(--primary-light);
      color: var(--primary) !important;
      border: 1px solid rgba(29, 78, 216, 0.2);
    }

    .btn-secondary:hover {
      background-color: #dbeafe;
    }

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

    /* Hero Section (No Images Allowed) */
    .hero-section {
      background: linear-gradient(180deg, #ffffff 0%, #eff6ff 100%);
      padding: 80px 0 60px 0;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-bg-decor {
      position: absolute;
      top: -100px;
      right: -100px;
      width: 450px;
      height: 450px;
      background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, rgba(29, 78, 216, 0) 70%);
      border-radius: 50%;
      pointer-events: none;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: var(--primary-light);
      border: 1px solid rgba(29, 78, 216, 0.2);
      border-radius: 50px;
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.6rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--primary-dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .hero-models-tag {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
      max-width: 850px;
      margin: 0 auto;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.78rem;
      color: var(--text-muted);
      font-weight: 500;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    }

    /* General Section Layout */
    .section-padding {
      padding: 70px 0;
    }

    .section-bg-white {
      background-color: #ffffff;
    }

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

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

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* Grid & Cards */
    .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-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(29, 78, 216, 0.3);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      background-color: var(--primary-light);
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: bold;
      margin-bottom: 20px;
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-tag {
      display: inline-block;
      margin-top: 14px;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 3px 8px;
      background-color: var(--bg-main);
      color: var(--accent);
      border-radius: 4px;
      width: fit-content;
    }

    /* About Section */
    .about-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .about-image img {
      width: 100%;
      height: auto;
      border-radius: 10px;
      object-fit: cover;
    }

    .about-text h3 {
      font-size: 1.6rem;
      color: var(--primary-dark);
      margin-bottom: 16px;
    }

    .about-text p {
      font-size: 0.98rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      line-height: 1.7;
    }

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

    .metric-card {
      background-color: var(--primary-light);
      border: 1px solid rgba(29, 78, 216, 0.15);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
    }

    .metric-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Timeline & Workflow */
    .timeline {
      position: relative;
      max-width: 900px;
      margin: 0 auto;
    }

    .timeline-item {
      display: flex;
      gap: 24px;
      margin-bottom: 30px;
    }

    .timeline-step {
      width: 44px;
      height: 44px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      flex-shrink: 0;
    }

    .timeline-content {
      background: #fff;
      border: 1px solid var(--border-color);
      padding: 20px 24px;
      border-radius: var(--radius);
      flex-grow: 1;
    }

    /* Table Styles (Comparison & Token Price) */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

    th, td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    th {
      background-color: var(--primary-light);
      color: var(--primary-dark);
      font-weight: 700;
    }

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

    .rating-badge {
      background-color: #fef3c7;
      color: #b45309;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 0.85rem;
    }

    /* Image Gallery & Cases */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .case-card {
      background: #fff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
    }

    .case-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }

    .case-info {
      padding: 20px;
    }

    /* Testimonials / User Reviews */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

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

    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .review-author h4 {
      font-size: 0.98rem;
      font-weight: 700;
    }

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

    .review-stars {
      color: #f59e0b;
      margin-bottom: 10px;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-main);
    }

    .faq-question:hover {
      background-color: var(--primary-light);
    }

    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 0.92rem;
      color: var(--text-muted);
      display: none;
      line-height: 1.7;
    }

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

    .faq-item.active .faq-toggle {
      transform: rotate(180deg);
    }

    .faq-toggle {
      transition: transform 0.2s;
      font-weight: normal;
    }

    /* Articles Section */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      margin-top: 20px;
    }

    .article-links-box ul {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 12px;
    }

    .article-links-box li a {
      display: block;
      padding: 10px 14px;
      background: var(--bg-main);
      border-radius: 6px;
      font-size: 0.88rem;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }

    .article-links-box li a:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

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

    .contact-info h3 {
      font-size: 1.5rem;
      color: var(--primary-dark);
      margin-bottom: 20px;
    }

    .info-item {
      margin-bottom: 16px;
      font-size: 0.95rem;
    }

    .info-item strong {
      color: var(--text-main);
      display: inline-block;
      width: 100px;
    }

    .qr-box {
      margin-top: 24px;
      display: inline-block;
      text-align: center;
      padding: 16px;
      background: var(--bg-main);
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      border-radius: 6px;
    }

    .contact-form .form-group {
      margin-bottom: 16px;
    }

    .contact-form label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .contact-form input,
    .contact-form select,
    .contact-form textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.92rem;
      background-color: var(--bg-main);
      transition: var(--transition);
    }

    .contact-form input:focus,
    .contact-form select:focus,
    .contact-form textarea:focus {
      outline: none;
      border-color: var(--primary);
      background-color: #fff;
      box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.1);
    }

    /* Footer */
    .site-footer {
      background-color: var(--primary-dark);
      color: #94a3b8;
      padding: 50px 0 20px 0;
      font-size: 0.88rem;
      border-top: 1px solid rgba(255,255,255,0.1);
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.2rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      color: #94a3b8;
      line-height: 1.6;
      max-width: 400px;
    }

    .footer-links h5 {
      color: #ffffff;
      font-size: 0.95rem;
      margin-bottom: 14px;
    }

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

    .footer-links li {
      margin-bottom: 8px;
    }

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

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

    .friendship-links {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      margin-top: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friendship-links span {
      color: #ffffff;
      font-weight: 600;
    }

    .friendship-links a {
      color: #94a3b8;
    }

    .friendship-links a:hover {
      color: #ffffff;
    }

    .copyright-bar {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 20px;
      text-align: center;
      color: #64748b;
      font-size: 0.82rem;
    }

    /* Floating Widget */
    .floating-widget {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      cursor: pointer;
      border: none;
      font-size: 1.2rem;
      transition: var(--transition);
    }

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

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-title { font-size: 2.2rem; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .about-box, .contact-wrapper { grid-template-columns: 1fr; }
      .footer-inner { grid-template-columns: 1fr; gap: 24px; }
    }

    @media (max-width: 768px) {
      .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-title { font-size: 1.8rem; }
      .hero-btns { flex-direction: column; }
      .metrics-grid { grid-template-columns: 1fr; }
    }