/* CSS Standard & Vibrant Color Contrast Theme */
    :root {
      --primary-color: #2563eb;
      --primary-dark: #1d4ed8;
      --accent-vibrant: #ff5722;
      --accent-green: #10b981;
      --accent-cyan: #06b6d4;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-dark-accent: #0f172a;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
      --shadow-md: 0 10px 25px -5px rgba(37,99,235,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
      --shadow-lg: 0 20px 30px -10px rgba(15,23,42,0.15);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --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, "Noto Sans", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
    }

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

    /* Section Global Style */
    section {
      padding: 70px 0;
      position: relative;
    }
    
    .section-title-wrap {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(37, 99, 235, 0.1);
      color: var(--primary-color);
      font-size: 0.875rem;
      font-weight: 700;
      border-radius: 50px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.2rem;
      color: var(--text-main);
      font-weight: 800;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      margin-top: 10px;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
    }

    /* Vibrant Badges & Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 700;
      border-radius: var(--radius-md);
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
      color: var(--text-light);
      box-shadow: 0 4px 15px rgba(37, 99, 235, 0.35);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(37, 99, 235, 0.45);
    }

    .btn-vibrant {
      background: linear-gradient(135deg, #ff5722, #ff7043);
      color: var(--text-light);
      box-shadow: 0 4px 15px rgba(255, 87, 34, 0.35);
    }
    .btn-vibrant:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(255, 87, 34, 0.5);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary-color);
      border: 2px solid var(--primary-color);
    }
    .btn-outline:hover {
      background: var(--primary-color);
      color: var(--text-light);
    }

    /* Header Navigation */
    .site-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);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo-container {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 900;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 20px;
      list-style: none;
    }

    .nav-link {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
      transition: color 0.2s ease;
    }

    .nav-link:hover {
      color: var(--primary-color);
    }

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

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

    /* HERO SECTION (No Images Allowed) */
    .hero-section {
      background: linear-gradient(135deg, #eff6ff 0%, #ffffff 50%, #f0f9ff 100%);
      padding: 90px 0 80px 0;
      overflow: hidden;
      position: relative;
    }

    .hero-section::before {
      content: '';
      position: absolute;
      top: -100px;
      right: -100px;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, rgba(255,255,255,0) 70%);
      border-radius: 50%;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: linear-gradient(90deg, #2563eb, #06b6d4);
      color: white;
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 700;
      margin-bottom: 25px;
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.25);
    }

    .hero-title {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 35px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-cta-group {
      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: 40px;
    }

    .hero-stat-card {
      background: var(--bg-card);
      padding: 22px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.3s ease;
    }
    .hero-stat-card:hover {
      transform: translateY(-5px);
      border-color: var(--primary-color);
    }

    .stat-number {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary-color);
      line-height: 1.1;
    }

    .stat-label {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-top: 6px;
      font-weight: 600;
    }

    /* Cards & Grid Base */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 25px;
    }

    .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: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
    }

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

    .card-icon {
      width: 54px;
      height: 54px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(6, 182, 212, 0.15));
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: bold;
      margin-bottom: 20px;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

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

    /* Models Cloud Tag */
    .model-tags-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 25px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }

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

    /* Comparison Table Section */
    .comparison-box {
      background: white;
      border-radius: var(--radius-lg);
      border: 2px solid var(--primary-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .rating-banner {
      background: linear-gradient(135deg, var(--bg-dark-accent), #1e293b);
      color: white;
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .score-num {
      font-size: 3rem;
      font-weight: 900;
      color: #f59e0b;
      line-height: 1;
    }

    .stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

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

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

    .comp-table th {
      background: #f1f5f9;
      font-weight: 800;
      color: var(--text-main);
    }

    .comp-table tr:hover {
      background: #f8fafc;
    }

    .check-icon {
      color: var(--accent-green);
      font-weight: bold;
    }
    .cross-icon {
      color: #ef4444;
      font-weight: bold;
    }

    /* Standard Flow Step */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: white;
      padding: 25px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-num {
      font-size: 2.5rem;
      font-weight: 900;
      color: rgba(37, 99, 235, 0.15);
      position: absolute;
      top: 15px;
      right: 20px;
    }

    /* User Reviews */
    .review-card {
      background: white;
      padding: 25px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 15px;
    }

    .avatar-placeholder {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-cyan));
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }

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

    .faq-question {
      padding: 20px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: white;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background: #f8fafc;
    }

    .faq-answer {
      padding: 0 20px;
      max-height: 0;
      overflow: hidden;
      transition: all 0.3s ease;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      padding: 0 20px 20px 20px;
      max-height: 300px;
    }

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

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

    /* Form Section */
    .form-wrapper {
      background: white;
      padding: 40px;
      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;
      margin-bottom: 8px;
      font-weight: 700;
      font-size: 0.95rem;
    }

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

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary-color);
    }

    /* Media Grid Images */
    .ai-page-image {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }
    .ai-page-image:hover {
      transform: scale(1.02);
    }

    .qr-box {
      text-align: center;
      padding: 20px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      border: 1px dashed #cbd5e1;
    }

    .qr-box img {
      max-width: 160px;
      height: auto;
      border-radius: var(--radius-sm);
      margin-bottom: 10px;
    }

    /* Footer */
    .site-footer {
      background: var(--bg-dark-accent);
      color: #94a3b8;
      padding: 60px 0 30px 0;
      font-size: 0.9rem;
    }

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

    .footer-title {
      color: white;
      font-weight: 700;
      font-size: 1.1rem;
      margin-bottom: 20px;
    }

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

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .footer-links a:hover {
      color: white;
    }

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

    .friendship-links a {
      color: #cbd5e1;
      text-decoration: none;
      background: rgba(255,255,255,0.05);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
    }

    .friendship-links a:hover {
      background: var(--primary-color);
      color: white;
    }

    .copyright-bar {
      border-top: 1px solid #1e293b;
      padding-top: 25px;
      text-align: center;
      color: #64748b;
    }

    /* Floating Customer Service */
    .floating-cs {
      position: fixed;
      right: 25px;
      bottom: 25px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .cs-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--primary-color);
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      text-decoration: none;
      font-weight: bold;
      font-size: 1.2rem;
      transition: transform 0.2s ease;
    }

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

    /* Articles Section */
    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 15px;
    }

    .article-item {
      background: white;
      padding: 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }

    .article-link {
      color: var(--text-main);
      font-weight: 600;
      text-decoration: none;
    }

    .article-link:hover {
      color: var(--primary-color);
    }

    /* Responsive Design */
    @media (max-width: 992px) {
      .grid-3, .grid-4, .step-grid, .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 2.3rem;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .grid-2, .grid-3, .grid-4, .step-grid, .hero-stats-grid, .article-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
      }
    }