.dropdown {
    z-index: 9999;  /* Ensure dropdown appears above other elements */
  }
  body {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
  }
  .radio-custom:checked + span {
    font-weight: 600;
    color: #2563eb;
  }
  .book-content {
    font-family: 'Georgia', serif;
    line-height: 1.8;
  }
  .book-content * {
    color: #374151 !important;
  }
  .book-content h1, .book-content h2, .book-content h3 {
    font-family: 'Georgia', serif;
    border-bottom: 1px solid rgba(55, 65, 81, 0.2);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
  }
  .book-content p {
    margin-bottom: 1.5rem;
    text-align: justify;
  }
  .book-content ul, .book-content ol {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
  }
  .book-content a {
    color: #2563eb !important;
    text-decoration: underline;
  }
  .book-content blockquote {
    border-left: 4px solid #2563eb;
    padding-left: 1rem;
    margin-left: 0;
    font-style: italic;
  }

  .custom-scrollbar {
    scrollbar-width: thin;
    scrollbar-color: rgba(99, 102, 241, 0.5) transparent;
  }
  .custom-scrollbar::-webkit-scrollbar {
    width: 4px;
  }
  .custom-scrollbar::-webkit-scrollbar-track {
    background: transparent;
  }
  .custom-scrollbar::-webkit-scrollbar-thumb {
    background-color: rgba(99, 102, 241, 0.5);
    border-radius: 20px;
  }
  .question-indicator.active {
    background-color: #4f46e5; /* Indigo color for active state */
    color: white;
    border-color: #4f46e5;
  }
  .dark .question-indicator.active {
    background-color: #818cf8; /* Lighter indigo for dark mode */
    border-color: #818cf8;
  }