app/node_modules/@angular/material/stepper/_stepper-theme.scss

@use '../core/theming/theming';
@use '../core/theming/inspection';
@use '../core/theming/validation';
@use '../core/typography/typography';
@use '../core/style/sass-utils';
@use '../core/tokens/token-utils';
@use '../core/tokens/m2/mat/stepper' as tokens-mat-stepper;

/// Outputs base theme styles (styles not dependent on the color, typography, or density settings)
/// for mat-stepper.
/// @param {Map} $theme The theme to generate base styles for.
@mixin base($theme) {
  @if inspection.get-theme-version($theme) == 1 {
    @include _theme-from-tokens(inspection.get-theme-tokens($theme, base));
  } @else {
  }
}

/// Outputs color theme styles for mat-stepper.
/// @param {Map} $theme The theme to generate color styles for.
/// @param {ArgList} Additional optional arguments (only supported for M3 themes):
///   $color-variant: The color variant to use for the stepper: primary, secondary,
///   tertiary, or error (If not specified, primary color values will be used).
@mixin color($theme, $options...) {
  @if inspection.get-theme-version($theme) == 1 {
    @include _theme-from-tokens(inspection.get-theme-tokens($theme, color), $options...);
  } @else {
    @include sass-utils.current-selector-or-root() {
      @include token-utils.create-token-values(
        tokens-mat-stepper.$prefix,
        tokens-mat-stepper.get-color-tokens($theme)
      );

      .mat-step-header.mat-accent {
        @include token-utils.create-token-values(
          tokens-mat-stepper.$prefix,
          tokens-mat-stepper.private-get-color-palette-color-tokens($theme, accent)
        );
      }

      .mat-step-header.mat-warn {
        @include token-utils.create-token-values(
          tokens-mat-stepper.$prefix,
          tokens-mat-stepper.private-get-color-palette-color-tokens($theme, warn)
        );
      }
    }
  }
}

/// Outputs typography theme styles for mat-stepper.
/// @param {Map} $theme The theme to generate typography styles for.
@mixin typography($theme) {
  @if inspection.get-theme-version($theme) == 1 {
    @include _theme-from-tokens(inspection.get-theme-tokens($theme, typography));
  } @else {
    @include sass-utils.current-selector-or-root() {
      @include token-utils.create-token-values(
        tokens-mat-stepper.$prefix,
        tokens-mat-stepper.get-typography-tokens($theme)
      );
    }
  }
}

/// Outputs density theme styles for mat-stepper.
/// @param {Map} $theme The theme to generate density styles for.
@mixin density($theme) {
  @if inspection.get-theme-version($theme) == 1 {
    @include _theme-from-tokens(inspection.get-theme-tokens($theme, density));
  } @else {
    @include sass-utils.current-selector-or-root() {
      @include token-utils.create-token-values(
        tokens-mat-stepper.$prefix,
        tokens-mat-stepper.get-density-tokens($theme)
      );
    }
  }
}

/// Defines the tokens that will be available in the `overrides` mixin and for docs extraction.
@function _define-overrides() {
  @return (
    (
      namespace: tokens-mat-stepper.$prefix,
      tokens: tokens-mat-stepper.get-token-slots(),
    ),
  );
}

/// Outputs the CSS variable values for the given tokens.
/// @param {Map} $tokens The token values to emit.
@mixin overrides($tokens: ()) {
  @include token-utils.batch-create-token-values($tokens, _define-overrides()...);
}

/// Outputs all (base, color, typography, and density) theme styles for mat-stepper.
/// @param {Map} $theme The theme to generate color styles for.
/// @param {ArgList} Additional optional arguments (only supported for M3 themes):
///   $color-variant: The color variant to use for the stepper: primary, secondary,
///   tertiary, or error (If not specified, primary color values will be used).
@mixin theme($theme, $options...) {
  @include theming.private-check-duplicate-theme-styles($theme, 'mat-stepper') {
    @if inspection.get-theme-version($theme) == 1 {
      @include _theme-from-tokens(inspection.get-theme-tokens($theme), $options...);
    } @else {
      @include base($theme);
      @if inspection.theme-has($theme, color) {
        @include color($theme);
      }
      @if inspection.theme-has($theme, density) {
        @include density($theme);
      }
      @if inspection.theme-has($theme, typography) {
        @include typography($theme);
      }
    }
  }
}

@mixin _theme-from-tokens($tokens, $options...) {
  @include validation.selector-defined(
    'Calls to Angular Material theme mixins with an M3 theme must be wrapped in a selector'
  );
  @if ($tokens != ()) {
    $mat-stepper-tokens: token-utils.get-tokens-for(
      $tokens,
      tokens-mat-stepper.$prefix,
      $options...
    );
    @include token-utils.create-token-values(tokens-mat-stepper.$prefix, $mat-stepper-tokens);
  }
}