node_modules/@angular/material/checkbox/_checkbox-theme.scss

@import '../core/theming/theming';
@import '../core/typography/typography-utils';


@mixin mat-checkbox-color($config-or-theme) {
  $config: mat-get-color-config($config-or-theme);
  $is-dark-theme: map-get($config, is-dark);
  $primary: map-get($config, primary);
  $accent: map-get($config, accent);
  $warn: map-get($config, warn);
  $background: map-get($config, background);
  $foreground: map-get($config, foreground);


  // The color of the checkbox's checkmark / mixedmark.
  $checkbox-mark-color: mat-color($background, background);

  // NOTE(traviskaufman): While the spec calls for translucent blacks/whites for disabled colors,
  // this does not work well with elements layered on top of one another. To get around this we
  // blend the colors together based on the base color and the theme background.
  $white-30pct-opacity-on-dark: #686868;
  $black-26pct-opacity-on-light: #b0b0b0;
  $disabled-color: if($is-dark-theme, $white-30pct-opacity-on-dark, $black-26pct-opacity-on-light);

  .mat-checkbox-frame {
    border-color: mat-color($foreground, secondary-text);
  }

  .mat-checkbox-checkmark {
    fill: $checkbox-mark-color;
  }

  .mat-checkbox-checkmark-path {
    // !important is needed here because a stroke must be set as an
    // attribute on the SVG in order for line animation to work properly.
    stroke: $checkbox-mark-color !important;
  }

  .mat-checkbox-mixedmark {
    background-color: $checkbox-mark-color;
  }

  .mat-checkbox-indeterminate, .mat-checkbox-checked {
    &.mat-primary .mat-checkbox-background {
      background-color: mat-color($primary);
    }

    &.mat-accent .mat-checkbox-background {
      background-color: mat-color($accent);
    }

    &.mat-warn .mat-checkbox-background {
      background-color: mat-color($warn);
    }
  }

  .mat-checkbox-disabled {
    &.mat-checkbox-checked,
    &.mat-checkbox-indeterminate {
      .mat-checkbox-background {
        background-color: $disabled-color;
      }
    }

    &:not(.mat-checkbox-checked) {
      .mat-checkbox-frame {
        border-color: $disabled-color;
      }
    }

    .mat-checkbox-label {
      color: mat-color($foreground, secondary-text);
    }
  }

  // Switch this to a solid color since we're using `opacity`
  // to control how opaque the ripple should be.
  .mat-checkbox .mat-ripple-element {
    background-color: map-get(map-get($config, foreground), base);
  }

  .mat-checkbox-checked:not(.mat-checkbox-disabled),
  .mat-checkbox:active:not(.mat-checkbox-disabled) {
    &.mat-primary .mat-ripple-element {
      background: mat-color($primary);
    }

    &.mat-accent .mat-ripple-element {
      background: mat-color($accent);
    }

    &.mat-warn .mat-ripple-element {
      background: mat-color($warn);
    }
  }
}

@mixin mat-checkbox-typography($config-or-theme) {
  $config: mat-get-typography-config($config-or-theme);
  .mat-checkbox {
    font-family: mat-font-family($config);
  }

  // TODO(kara): Remove this style when fixing vertical baseline
  .mat-checkbox-layout .mat-checkbox-label {
    line-height: mat-line-height($config, body-2);
  }
}

@mixin _mat-checkbox-density($config-or-theme) {}

@mixin mat-checkbox-theme($theme-or-color-config) {
  $theme: mat-private-legacy-get-theme($theme-or-color-config);
  @include mat-private-check-duplicate-theme-styles($theme, 'mat-checkbox') {
    $color: mat-get-color-config($theme);
    $density: mat-get-density-config($theme);
    $typography: mat-get-typography-config($theme);

    @if $color != null {
      @include mat-checkbox-color($color);
    }
    @if $density != null {
      @include _mat-checkbox-density($density);
    }
    @if $typography != null {
      @include mat-checkbox-typography($typography);
    }
  }
}