/* ------------------------------------------
  MASK
--------------------------------------------- */

.mask {
  -webkit-transition: opacity 300ms;
  -moz-transition: opacity 300ms;
  transition: opacity 300ms;
  background: rgba(0,0,0, .5);
  visibility: hidden;
  position: fixed;
  opacity: 0;
  z-index: 2;
  bottom: 0;
  right: 0;
  left: 0;
  top: 0;
}

.android .mask {
  -webkit-transition: none;
  transition: none;
}

.js-nav-active .mask {
  visibility: visible;
  opacity: 1;
}

@media screen and (min-width: 40em) {
  .mask {
    display: none !important;
    opacity: 0 !important;
  }
}