node_modules/@angular/material/core/_core.scss

@import '../../cdk/overlay/overlay';
@import '../../cdk/a11y/a11y';
@import '../../cdk/text-field/text-field';

// Core styles that can be used to apply material design treatments to any element.
@import './style/private';
@import './ripple/ripple';
@import './focus-indicators/focus-indicators';
@import './option/option-theme';
@import './option/optgroup-theme';
@import './selection/pseudo-checkbox/pseudo-checkbox-theme';
@import './typography/all-typography';

// Mixin that renders all of the core styles that are not theme-dependent.
@mixin mat-core($typography-config: null) {
  @include angular-material-typography($typography-config);
  @include mat-ripple();
  @include cdk-a11y();
  @include cdk-overlay();
  @include cdk-text-field();

  @include mat-private-strong-focus-indicators-positioning();
  @include _mat-mdc-core();
}

@mixin mat-core-color($config-or-theme) {
  $config: mat-get-color-config($config-or-theme);
  // Wrapper element that provides the theme background when the user's content isn't
  // inside of a `mat-sidenav-container`. Note that we need to exclude the ampersand
  // selector in case the mixin is included at the top level.
  .mat-app-background#{if(&, ', &.mat-app-background', '')} {
    $background: map-get($config, background);
    $foreground: map-get($config, foreground);

    background-color: mat-color($background, background);
    color: mat-color($foreground, text);
  }

  // Provides external CSS classes for each elevation value. Each CSS class is formatted as
  // `mat-elevation-z$zValue` where `$zValue` corresponds to the z-space to which the element is
  // elevated.
  @for $zValue from 0 through 24 {
    .#{$mat-elevation-prefix}#{$zValue} {
      @include mat-private-theme-elevation($zValue, $config);
    }
  }

  // Marker that is used to determine whether the user has added a theme to their page.
  @at-root {
    .mat-theme-loaded-marker {
      display: none;
    }
  }
}

// Mixin that renders all of the core styles that depend on the theme.
@mixin mat-core-theme($theme-or-color-config) {
  $theme: mat-private-legacy-get-theme($theme-or-color-config);
  // Wrap the sub-theme includes in the duplicate theme styles mixin. This ensures that
  // there won't be multiple warnings. e.g. if `mat-core-theme` reports a warning, then
  // the imported themes (such as `mat-ripple-theme`) should not report again.
  @include mat-private-check-duplicate-theme-styles($theme, 'mat-core') {
    @include mat-ripple-theme($theme);
    @include mat-option-theme($theme);
    @include mat-optgroup-theme($theme);
    @include mat-pseudo-checkbox-theme($theme);

    $color: mat-get-color-config($theme);
    @if $color != null {
      @include mat-core-color($color);
    }
  }
}

// Mixin that renders all of the core MDC styles. Private mixin included with `mat-core`.
@mixin _mat-mdc-core() {
  @include _mat-mdc-strong-focus-indicators-positioning();
}

// Mixin that ensures focus indicator host elements are positioned so that the focus indicator
// pseudo element within is positioned relative to the host. Private mixin included within
// `_mat-mdc-core`.
@mixin _mat-mdc-strong-focus-indicators-positioning() {
  .mat-mdc-focus-indicator {
    position: relative;
  }
}