.#{$window} {
  box-shadow: $window-shadow;
  border: $window-border;
  border-radius: $window-border-radius;
  @include display-flex;
  @include flex-direction(column);
  
  .#{$window-content} {
    background: $window-content-background;
    padding: $window-content-padding;
    @include flex(1 1 auto);
  }
  
  .#{$window-header} {
    background: $window-header-background;
    padding: $window-header-padding;
    color: $window-header-color;
    font-size: $window-header-font-size;
    border-bottom: $window-header-border-bottom;
    @include display-flex;
    @include justify-content(space-between);
  }
  
  .#{$window-footer} {
    background: $window-footer-background;
    padding: $window-footer-padding;
    color: $window-footer-color;
    border-top: $window-footer-border-top;
  }
  
  .#{$window-header}, .#{$window-footer} {
    @include display-flex;
    @include justify-content(space-between);
    @include flex(0 0 auto);
    min-height: 0;
  }
}