.nav-icon {
  width: 35px;
  height: 30px;
  position: relative;
  cursor: pointer;

  @include rotate(0deg);
  @include transition-duration(0.5s);
  @include transition-timing-function(ease-in-out);

  span {
    display: block;
    position: absolute;
    height: 6px;
    width: 100%;
    background: $color__link;
    border-radius: 6px;
    opacity: 1;
    left: 0;

    @include rotate(0deg);
    @include transition-duration(0.25s);
    @include transition-timing-function(ease-in-out);

    &:nth-child(1) {
      top: 0px;
    }

    &:nth-child(2),
    &:nth-child(3) {
      top: 12px;
    }

    &:nth-child(4) {
      top: 24px;
    }
  }

  &.open {
    span {
      &:nth-child(1) {
        top: 12px;
        width: 0%;
        left: 50%;
      }

      &:nth-child(2) {
        @include rotate(45deg);
      }

      &:nth-child(3) {
        @include rotate(-45deg);
      }

      &:nth-child(4) {
        top: 12px;
        width: 0%;
        left: 50%;
      }
    }
  }
}