/* CSS Variables & Global Resets */
    :root {
      --primary: #3b82f6;
      --primary-dark: #1d4ed8;
      --accent-magenta: #d946ef;
      --accent-cyan: #06b6d4;
      --accent-yellow: #f59e0b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(59, 130, 246, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.15);
      --radius: 12px;
      --max-width: 1200px;
    }

    * {
      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-page);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.2s ease;
    }

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

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

    /* Common Components */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: 50px;
      border: 2px solid transparent;
      cursor: pointer;
      transition: all 0.3s ease;
      text-align: center;
    }

    .btn-vivid {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-magenta) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(217, 70, 239, 0.35);
    }

    .btn-vivid:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(217, 70, 239, 0.5);
    }

    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: #ffffff;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #ffffff !important;
      transform: translateY(-2px);
    }

    .section-title {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }

    .section-title h2::after {
      content: '';
      display: block;
      width: 60%;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
      margin: 8px auto 0;
      border-radius: 2px;
    }

    .section-title p {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 650px;
      margin: 0 auto;
    }

    .badge-vivid {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 20px;
      background: rgba(59, 130, 246, 0.1);
      color: var(--primary-dark);
      border: 1px solid rgba(59, 130, 246, 0.3);
      margin-bottom: 12px;
      text-transform: uppercase;
    }

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

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }

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

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

    .nav-links li a {
      padding: 10px 14px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      display: block;
      white-space: nowrap;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(59, 130, 246, 0.05);
      border-radius: 6px;
    }

    .nav-btn {
      margin-left: 10px;
    }

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

    /* Section Wrapper Setup */
    .page-section {
      padding: 70px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }

    .page-section:nth-child(even) {
      background: #ffffff;
    }

    /* 1. Hero Section (Strictly NO Images) */
    .hero-section {
      padding: 90px 0 80px;
      background: linear-gradient(135deg, #eff6ff 0%, #f5f3ff 50%, #eef2ff 100%);
      position: relative;
      overflow: hidden;
      border-bottom: 2px solid rgba(59, 130, 246, 0.15);
    }

    .hero-section::before {
      content: '';
      position: absolute;
      top: -100px;
      right: -100px;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(217, 70, 239, 0.15) 0%, rgba(255,255,255,0) 70%);
      border-radius: 50%;
      pointer-events: none;
    }

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

    .hero-content h1 {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #d946ef 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-content p {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 35px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .stat-card {
      background: #ffffff;
      padding: 22px 15px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      border-top: 4px solid var(--primary);
      transition: transform 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-50px);
    }

    .stat-card:nth-child(2) { border-top-color: var(--accent-magenta); }
    .stat-card:nth-child(3) { border-top-color: var(--accent-cyan); }
    .stat-card:nth-child(4) { border-top-color: var(--accent-yellow); }

    .stat-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-top: 4px;
    }

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

    /* Cards Style - Vivid Contrast */
    .card-box {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

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

    .card-icon {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(217, 70, 239, 0.1));
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: bold;
      margin-bottom: 20px;
    }

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

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Model Badges Tag Cloud */
    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .model-tag {
      background: #f1f5f9;
      color: #334155;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      border: 1px solid #cbd5e1;
      transition: all 0.2s;
    }

    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* Process Workflow Component */
    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      padding: 25px 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-number {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, var(--primary), var(--accent-magenta));
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin: 0 auto 15px;
    }

    /* Table Design for Comparison & Token Pricing */
    .custom-table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    table.custom-table th, table.custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    table.custom-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

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

    table.custom-table tr:hover td {
      background: rgba(59, 130, 246, 0.02);
    }

    .highlight-cell {
      background: rgba(59, 130, 246, 0.08) !important;
      font-weight: 700;
      color: var(--primary-dark);
    }

    /* Review Cards */
    .review-card {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 25px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 15px;
      margin-bottom: 15px;
    }

    .review-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .review-user h4 {
      font-size: 1rem;
      font-weight: 700;
    }

    .review-user p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .stars {
      color: #f59e0b;
      font-size: 0.9rem;
      margin-bottom: 10px;
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 850px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      margin-bottom: 14px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 25px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-answer {
      padding: 0 25px 20px;
      color: var(--text-muted);
      font-size: 0.96rem;
      display: none;
      line-height: 1.7;
    }

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

    .faq-icon {
      font-weight: 400;
      font-size: 1.2rem;
      transition: transform 0.3s;
    }

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

    /* Articles Section */
    .article-list-box {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 25px;
      border: 1px solid var(--border-color);
    }

    .article-links-container {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 15px;
    }

    .article-link-tag {
      display: inline-block;
      padding: 8px 16px;
      background: #f1f5f9;
      border-radius: 8px;
      font-size: 0.9rem;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }

    .article-link-tag:hover {
      background: var(--primary);
      color: #fff !important;
    }

    /* Contact Form Layout */
    .form-container {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 35px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      font-size: 0.95rem;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      font-size: 0.95rem;
      outline: none;
      transition: border 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
    }

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

    .contact-info-card {
      background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 35px;
      height: 100%;
    }

    .contact-info-card h3 {
      font-size: 1.5rem;
      margin-bottom: 20px;
      color: #ffffff;
    }

    .contact-info-item {
      margin-bottom: 18px;
      font-size: 0.95rem;
      color: #cbd5e1;
    }

    .qr-box {
      margin-top: 25px;
      text-align: center;
      background: rgba(255, 255, 255, 0.05);
      padding: 20px;
      border-radius: 12px;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .qr-box img {
      max-width: 150px;
      border-radius: 8px;
      margin-bottom: 10px;
    }

    /* Footer Design */
    .footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 0.9rem;
      border-top: 1px solid #1e293b;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 20px;
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links-box a {
      color: #cbd5e1;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 25px;
      text-align: center;
      color: #64748b;
      font-size: 0.85rem;
    }

    /* Floating Contact Widget */
    .float-widget {
      position: fixed;
      right: 25px;
      bottom: 25px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
      cursor: pointer;
      font-weight: bold;
      font-size: 0.8rem;
      text-align: center;
      transition: transform 0.2s;
    }

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

    /* Responsive Adaptation */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .step-list { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active { display: flex; }
      .mobile-menu-toggle { display: block; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 2.1rem; }
      .hero-stats-grid { grid-template-columns: 1fr; }
      .step-list { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr; }
    }