/* Ocultar todos los menus desplegables por defecto */
nav .navbar-nav .dropdown-menu {
  display: none ;
}


/* Reglas que permiten mostrar los menus desplegables en dispositivos moviles */
@media (max-width: 991px) {
  nav .navbar-nav .dropdown:focus-within > .dropdown-menu,
  nav .navbar-nav .dropdown:focus > .dropdown-menu {
    display: block ;
  }

  nav .navbar-nav .dropdown-submenu:focus-within > .dropdown-menu,
  nav .navbar-nav .dropdown-submenu:focus > .dropdown-menu {
    display: block;
    left: 100%;
    top: 0;
  }


  nav .navbar-nav .dropdown-menu {
    position: static;
    float: none;
  }

  nav .navbar-nav .dropdown-submenu {
    position: relative;
  }

  nav .navbar-nav .dropdown-submenu .dropdown-menu {
    left: 100%;
    top: 0;
    position: absolute;
  }
}