/* CSS Variables & Global Reset */
    :root {
      --primary: #7c3aed;
      --primary-hover: #6d28d9;
      --primary-dark: #4c1d95;
      --primary-light: #f3e8ff;
      --accent: #c084fc;
      --bg-page: #faf5ff;
      --bg-card: #ffffff;
      --bg-alt: #f3e8ff;
      --text-main: #1f1135;
      --text-muted: #584c6c;
      --border-color: #e9d5ff;
      --shadow-sm: 0 2px 8px rgba(124, 58, 237, 0.08);
      --shadow-md: 0 8px 24px rgba(124, 58, 237, 0.12);
      --shadow-lg: 0 16px 32px rgba(124, 58, 237, 0.16);
      --radius: 12px;
      --transition: all 0.3s 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-page);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
    }

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

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Common Components */
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-title h2 {
      font-size: 2rem;
      color: var(--text-main);
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }

    .section-title h2::after {
      content: '';
      display: block;
      width: 40px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--accent));
      margin: 8px auto 0;
      border-radius: 2px;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: none;
      transition: var(--transition);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(124, 58, 237, 0.45);
      color: #ffffff;
    }

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

    .btn-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .badge {
      display: inline-block;
      padding: 4px 12px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 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);
    }

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

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

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
    }

    /* CSS Requirement explicitly set gap:0 for .nav-links */
    .nav-links {
      display: flex;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 0;
    }

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 500;
      border-radius: 6px;
    }

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

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

    /* Hero Section (Strictly NO Images inside Hero) */
    .hero-section {
      padding: 90px 0 70px;
      background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 50%, #fae8ff 100%);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

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

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-cta {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 20px;
    }

    .tag-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      color: var(--primary-dark);
      box-shadow: 0 2px 4px rgba(0,0,0,0.03);
    }

    /* Data Indicator Cards */
    .stats-section {
      padding: 40px 0;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 24px;
    }

    .stat-card {
      text-align: center;
      padding: 24px;
      background: var(--bg-page);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }

    .stat-number {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }

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

    /* Section Padding Standard */
    .section-padding {
      padding: 70px 0;
    }

    /* Card Grid System */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 28px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      font-weight: bold;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* Comparison Section */
    .comparison-box {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

    .rating-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, var(--primary-dark), var(--primary));
      color: #ffffff;
      padding: 24px;
      border-radius: 10px;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-score {
      font-size: 2.5rem;
      font-weight: 800;
    }

    .rating-stars {
      color: #fbbf24;
      font-size: 1.5rem;
    }

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

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

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

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

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

    .highlight-cell {
      font-weight: bold;
      color: var(--primary);
      background: #fdf4ff;
    }

    /* Step Process Component */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius);
      position: relative;
    }

    .step-number {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary);
      opacity: 0.3;
      position: absolute;
      top: 16px;
      right: 20px;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
    }

    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-question::after {
      content: '−';
    }

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

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 20px 20px;
      border-top: 1px solid var(--border-color);
    }

    /* Media Banner & Gallery Display */
    .media-gallery {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

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

    .media-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }

    .media-card:hover img {
      transform: scale(1.03);
    }

    /* Form Section */
    .contact-form-container {
      max-width: 700px;
      margin: 0 auto;
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 1rem;
      background: var(--bg-page);
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
    }

    /* Article List Section */
    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 800px;
      margin: 0 auto;
    }

    .article-item a {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      color: var(--text-main);
      font-weight: 500;
    }

    .article-item a:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateX(4px);
    }

    /* Footer Section */
    .site-footer {
      background: var(--primary-dark);
      color: #e9d5ff;
      padding: 60px 0 30px;
      border-top: 1px solid var(--primary);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 20px;
      position: relative;
    }

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

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

    .footer-col a {
      color: #d8b4fe;
      font-size: 0.95rem;
    }

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

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

    .friend-links a {
      background: rgba(255, 255, 255, 0.1);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
      color: #e9d5ff;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 0.9rem;
      color: #c084fc;
    }

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

    .floating-kefu img {
      width: 100px;
      height: 100px;
      border-radius: 6px;
      display: block;
      margin: 0 auto 6px;
    }

    .floating-kefu span {
      font-size: 0.75rem;
      color: var(--text-muted);
      display: block;
    }

    /* Responsive Mobile Design */
    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }

      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        padding: 12px 0;
      }

      .nav-links.show {
        display: flex;
      }

      .nav-links li a {
        padding: 12px 24px;
        border-radius: 0;
      }

      .hero-title {
        font-size: 1.85rem;
      }

      .hero-subtitle {
        font-size: 1rem;
      }

      .rating-header {
        flex-direction: column;
        text-align: center;
      }

      .floating-kefu {
        display: none; /* Hide on mobile to prevent clutter */
      }
    }