/* CSS Variables - Gradient Cyan Tech Style */
    :root {
      --primary: #0284c7;
      --primary-dark: #0369a1;
      --primary-light: #e0f2fe;
      --accent: #06b6d4;
      --accent-glow: rgba(6, 182, 212, 0.15);
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #cbd5e1;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 8px 24px rgba(2, 132, 199, 0.08);
      --shadow-lg: 0 16px 32px rgba(2, 132, 199, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
    }

    * {
      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 Standard */
    .container {
      width: 100%;
      max-width: 1200px;
      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(--primary);
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

    /* 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 #e2e8f0;
      box-shadow: var(--shadow-sm);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

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

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

    .nav-links li {
      display: inline-block;
    }

    .nav-links a {
      display: block;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-decoration: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(2, 132, 199, 0.4);
    }

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

    .btn-outline:hover {
      background: var(--primary-light);
    }

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

    /* Hero Section (FIRST SCREEN - ZERO IMAGES) */
    .hero-section {
      background: linear-gradient(180deg, #f0f9ff 0%, var(--bg-main) 100%);
      padding: 80px 0 60px 0;
      position: relative;
      overflow: hidden;
    }

    .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%);
      pointer-events: none;
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: #e0f2fe;
      color: var(--primary-dark);
      border: 1px solid #bae6fd;
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 38px;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      line-height: 1.25;
    }

    .hero-subtitle {
      font-size: 17px;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.6;
    }

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

    /* Stats Grid inside Hero */
    .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 #e2e8f0;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
    }

    .stat-number {
      font-size: 30px;
      font-weight: 800;
      color: var(--primary);
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* Common Section Formatting */
    .section-padding {
      padding: 80px 0;
    }

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

    .section-subtitle {
      color: var(--primary);
      font-weight: 700;
      font-size: 13px;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 30px;
      margin-bottom: 12px;
    }

    .section-desc {
      color: var(--text-muted);
      font-size: 15px;
    }

    /* Card Grids */
    .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;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .feature-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: bold;
      margin-bottom: 18px;
    }

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

    .feature-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Banner & Image Containers */
    .image-wrapper {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      background: #e2e8f0;
    }

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* Comparison Table Styling */
    .comparison-box {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-md);
    }

    .score-badge-card {
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
      color: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
    }

    .score-title {
      font-size: 18px;
      color: #94a3b8;
    }

    .score-val {
      font-size: 36px;
      font-weight: 900;
      color: #38bdf8;
    }

    .stars-display {
      color: #f59e0b;
      font-size: 20px;
    }

    .table-responsive {
      overflow-x: auto;
    }

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

    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #e2e8f0;
      font-size: 14px;
    }

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

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

    .highlight-cell {
      color: var(--primary);
      font-weight: 700;
    }

    /* Step Process */
    .process-step {
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      font-size: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
      box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
    }

    /* User Reviews */
    .review-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
    }

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

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .user-info h4 {
      font-size: 15px;
      color: var(--text-main);
    }

    .user-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 840px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-sm);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

    .faq-answer {
      padding: 0 24px 18px 24px;
      font-size: 14px;
      color: var(--text-muted);
      display: none;
      line-height: 1.6;
      border-top: 1px dashed #f1f5f9;
      margin-top: 8px;
      padding-top: 14px;
    }

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

    .faq-toggle {
      font-size: 18px;
      color: var(--primary);
      font-weight: bold;
    }

    /* Articles / Model cloud */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .tag-item {
      background: #e0f2fe;
      color: var(--primary-dark);
      padding: 6px 12px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 500;
    }

    /* Form Design */
    .form-container {
      background: var(--bg-card);
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-md);
      max-width: 760px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group.full-width {
      grid-column: span 2;
    }

    .form-group label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s ease;
    }

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

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* Footer Styling (Strict Readable colors) */
    .site-footer {
      background-color: #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-col h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 18px;
    }

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

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

    .footer-links a {
      color: #94a3b8;
      font-size: 13px;
    }

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

    .qr-container {
      background: #ffffff;
      padding: 8px;
      border-radius: var(--radius-sm);
      display: inline-block;
      max-width: 130px;
    }

    .qr-container img {
      width: 100%;
      height: auto;
      display: block;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
      text-align: center;
      font-size: 13px;
    }

    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
    }

    .friendship-links a {
      color: #64748b;
    }

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

    /* Floating Customer Service */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 12px;
      box-shadow: var(--shadow-lg);
      text-align: center;
      max-width: 140px;
    }

    .floating-kefu img {
      width: 100px;
      height: 100px;
      border-radius: var(--radius-sm);
    }

    .floating-kefu span {
      display: block;
      font-size: 12px;
      font-weight: bold;
      color: var(--text-main);
      margin-top: 6px;
    }

    /* Responsive Adjustments */
    @media (max-width: 992px) {
      .hero-stats, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(1, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 28px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid #e2e8f0;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        padding: 12px 16px;
        width: 100%;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .floating-kefu {
        display: none;
      }
    }