@mixin when($state) {
  @at-root {
    #{&}.#{$state-prefix + $state} {
      @content;
    }
  }
}

@mixin button-variant($color, $background-color, $border-color) {
  color: $color;
  background-color: $background-color;
  border-color: $border-color;

  &:hover,
  &:focus {
    background: mix($--color-white, $background-color, $--button-hover-tint-percent);
    border-color: mix($--color-white, $border-color, $--button-hover-tint-percent);
    color: $color;
    box-shadow: 0 6px 6px 0 rgba($background-color,.3);
  }

  &:active {
    background: mix($--color-black, $background-color, $--button-active-shade-percent);
    border-color: mix($--color-black, $border-color, $--button-active-shade-percent);
    color: $color;
    outline: none;
  }

  &.is-active {
    background: mix($--color-black, $background-color, $--button-active-shade-percent);
    border-color: mix($--color-black, $border-color, $--button-active-shade-percent);
    color: $color;
  }

  &.is-disabled {
    &,
    &:hover,
    &:focus,
    &:active {
      box-shadow: none;
      color: $--color-white;
      background-color: mix($background-color, $--color-white);
      border-color: mix($border-color, $--color-white);
    }
  }

  &.is-plain {
    //@include button-plain($background-color);
  }
}