/* Secondary menu below primary nav */
#sideNav .menu-gap {
  margin: 0.75rem 0;
  border: 0;
}
/* Stack secondary under primary; let Bootstrap control mobile collapse */
#sideNav .navbar-collapse {
  flex-direction: column;
}
#sideNav .navbar-collapse > .navbar-nav { width: 100%; }
#sideNav .navbar-secondary {
  border-top: 1px solid rgba(255,255,255,0.25);
  padding-top: 0.5rem;
  flex-direction: column; /* vertical list */
  margin-top: 0.25rem;
}
#sideNav .navbar-secondary .nav-link {
  font-weight: 600;
  opacity: 0.95;
}