/* Reset button style */
.btn-toggle {
    background: none;
    border: none;
    padding: 0.5rem 0;
    font-weight: 500;
    font-size: 1rem;
    color: #222;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .btn-toggle:hover {
    color: #000;
  }
  
  .collapse-icon {
    font-size: 1.6rem;   /* increase arrow size */
    transition: transform 0.2s ease;
  }  
  
  .btn-toggle[aria-expanded="true"] .collapse-icon {
    transform: rotate(90deg);
  }
  
  /* Nested levels indent */
  .btn-toggle-nav {
    padding-left: 1rem;
  }
  
  .nav-link {
    color: #444;
    font-size: 0.95rem;
  }
  
  .nav-link:hover {
    color: #000;
  }
  .sidebar-nav > ul > li > .btn-toggle {
    text-transform: uppercase;  /* makes first-level all caps */
    font-weight: 600;           /* make them bolder */
  }
  /* Add bottom border to first-level items */
.sidebar-nav > ul > li {
    border-bottom: 1px solid #ddd;  /* subtle line between departments */
    margin-bottom: 0.25rem;         /* optional spacing */
    padding-bottom: 0.25rem;        /* optional spacing */
  }
  
  /* Remove border for last item (optional) */
  .sidebar-nav > ul > li:last-child {
    border-bottom: none;
  }