/* CSS Reset & General Rules */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    :root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #06b6d4;
      --neon-purple: #8b5cf6;
      --neon-pink: #ec4899;
      --neon-blue: #3b82f6;
      --border-color: #e2e8f0;
      --glow-shadow: 0 10px 25px -5px rgba(139, 92, 246, 0.15), 0 8px 10px -6px rgba(6, 182, 212, 0.15);
      --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --max-width: 1200px;
    }

    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;
      background-color: var(--bg-main);
    }

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

    /* Typography */
    h1, h2, h3, h4 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
    }

    a {
      color: var(--neon-purple);
      text-decoration: none;
      transition: all 0.25s ease;
    }

    a:hover {
      color: var(--neon-cyan);
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 9999px;
      cursor: pointer;
      border: 2px solid transparent;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-align: center;
      white-space: nowrap;
    }

    .btn-neon {
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(6, 182, 212, 0.35);
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(139, 92, 246, 0.45);
      opacity: 0.95;
    }

    .btn-outline {
      background: #ffffff;
      border-color: var(--neon-purple);
      color: var(--neon-purple) !important;
    }

    .btn-outline:hover {
      background: rgba(139, 92, 246, 0.05);
      transform: translateY(-2px);
      border-color: var(--neon-cyan);
      color: var(--neon-cyan) !important;
    }

    /* Badges */
    .neon-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 20px;
      background: linear-gradient(90deg, rgba(6, 182, 212, 0.1), rgba(139, 92, 246, 0.1));
      color: var(--neon-purple);
      border: 1px solid rgba(139, 92, 246, 0.2);
      margin-bottom: 12px;
    }

    /* Section Styling */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px auto;
    }

    .section-title {
      font-size: 32px;
      margin-bottom: 12px;
      background: linear-gradient(135deg, #0f172a 0%, #3b82f6 50%, #8b5cf6 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* Header & Nav */
    .header {
      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: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

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

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-links li a {
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      display: block;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--neon-purple);
      background: rgba(139, 92, 246, 0.06);
    }

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

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

    /* Hero Section (NO IMAGES PER RULE) */
    .hero-section {
      padding: 100px 0 80px 0;
      background: radial-gradient(circle at 50% 20%, rgba(6, 182, 212, 0.08), rgba(139, 92, 246, 0.05) 50%, transparent 80%);
      text-align: center;
      overflow: hidden;
    }

    .hero-content {
      max-width: 880px;
      margin: 0 auto;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      line-height: 1.25;
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 40%, #7c3aed 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .stat-card {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--neon-cyan);
    }

    .stat-num {
      font-size: 30px;
      font-weight: 800;
      color: var(--neon-purple);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-light);
    }

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

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

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

    .card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--glow-shadow);
      border-color: rgba(139, 92, 246, 0.3);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(139, 92, 246, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: var(--neon-purple);
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 18px;
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* Tags Cloud / Supported Models */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      padding: 8px 16px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
      transition: all 0.25s ease;
    }

    .model-tag:hover {
      border-color: var(--neon-purple);
      color: var(--neon-purple);
      transform: scale(1.05);
    }

    /* Comparison Section */
    .rating-badge-box {
      background: linear-gradient(135deg, #0f172a, #1e1b4b);
      color: #ffffff;
      padding: 30px;
      border-radius: var(--radius-md);
      text-align: center;
      margin-bottom: 30px;
      box-shadow: 0 10px 30px rgba(15, 23, 42, 0.2);
    }

    .rating-score {
      font-size: 48px;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1;
      margin: 10px 0;
    }

    .stars {
      color: #f59e0b;
      font-size: 24px;
      margin-bottom: 8px;
    }

    .comparison-table-wrapper {
      overflow-x: auto;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      background: var(--bg-card);
      box-shadow: var(--card-shadow);
    }

    .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-color);
      font-size: 14px;
    }

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

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

    .highlight-col {
      background: rgba(139, 92, 246, 0.04);
      font-weight: 600;
      color: var(--neon-purple);
    }

    /* Steps / Process */
    .step-card {
      position: relative;
      background: var(--bg-card);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--neon-purple);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 16px;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 840px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.25s ease;
    }

    .faq-item.active {
      border-color: var(--neon-purple);
    }

    .faq-header {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 18px;
      color: var(--neon-purple);
    }

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

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

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

    /* Reviews Section */
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
    }

    .author-info h4 {
      font-size: 14px;
    }

    .author-info p {
      font-size: 12px;
      color: var(--text-light);
    }

    /* Form Styling */
    .form-box {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-color);
      box-shadow: var(--glow-shadow);
      max-width: 680px;
      margin: 0 auto;
    }

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

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 14px;
      outline: none;
      transition: border-color 0.25s ease;
      background: var(--bg-main);
      color: var(--text-main);
    }

    .form-control:focus {
      border-color: var(--neon-purple);
      box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* Articles & Links */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

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

    .article-item a {
      font-weight: 600;
      color: var(--text-main);
      display: block;
      margin-bottom: 8px;
    }

    .article-item a:hover {
      color: var(--neon-purple);
    }

    /* Footer */
    .footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      font-size: 14px;
    }

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

    .footer-brand h3 {
      color: #ffffff;
      font-size: 20px;
      margin-bottom: 12px;
    }

    .footer-links h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 16px;
    }

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

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

    .footer-links ul li a {
      color: #94a3b8;
    }

    .footer-links ul li a:hover {
      color: #38bdf8;
    }

    .footer-friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-friend-links a {
      color: #94a3b8;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 12px;
    }

    .footer-friend-links a:hover {
      color: #38bdf8;
      background: rgba(255, 255, 255, 0.1);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
    }

    /* Float Widget */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #ffffff;
      border-radius: 16px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.15);
      padding: 16px;
      text-align: center;
      border: 1px solid var(--border-color);
      width: 140px;
    }

    .float-kefu img {
      width: 100px;
      height: 100px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 8px;
    }

    .float-kefu p {
      font-size: 12px;
      font-weight: 600;
      color: var(--text-main);
    }

    /* Media Queries */
    @media (max-width: 1024px) {
      .grid-4, .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: stretch;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-subtitle {
        font-size: 15px;
      }
      .grid-3, .grid-2, .grid-4, .hero-stats, .articles-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .float-kefu {
        display: none;
      }
    }