@mixin button-variant($background, $border, $hover-background: darken($background, 7.5%), $hover-border: darken($border, 10%), $active-background: darken($background, 10%), $active-border: darken($border, 12.5%)) {
  color: color-yiq($background);
  background-color: $background;
  border-color: $border;

  &:hover {
    color: color-yiq($hover-background);
    background-color: $hover-background;
    border-color: $hover-border;
  }

  &:focus,
  &.focus {
    box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
  }

  // Disabled comes first so active can properly restyle
  &.disabled,
  &:disabled {
    color: color-yiq($background);
    background-color: $background;
    border-color: $border;
  }

  &:not(:disabled):not(.disabled):active,
  &:not(:disabled):not(.disabled).active,
  .show > &.dropdown-toggle {
    color: color-yiq($active-background);
    background-color: $active-background;
    border-color: $active-border;

    &:focus {
      box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
    }
  }
}

@mixin button-outline-variant($color, $color-hover: color-yiq($color), $active-background: $color, $active-border: $color) {
  color: $color;
  border-color: $color;

  &:hover {
    color: $color-hover;
    background-color: $active-background;
    border-color: $active-border;
  }

  &:focus,
  &.focus {
    box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
  }

  &.disabled,
  &:disabled {
    color: $color;
    background-color: transparent;
  }

  &:not(:disabled):not(.disabled):active,
  &:not(:disabled):not(.disabled).active,
  .show > &.dropdown-toggle {
    color: color-yiq($active-background);
    background-color: $active-background;
    border-color: $active-border;

    &:focus {
      box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
    }
  }
}

@each $color, $value in $theme-colors {
  .btn-#{$color} {
    @include button-variant($value, $value);
  }
}

@each $color, $value in $theme-colors {
  .btn-outline-#{$color} {
    @include button-outline-variant($value);
  }
}

.btn-link {
  color: $link-color;

  &:hover {
    color: $link-hover-color;
  }
}