function setupSkinUserCss( \OutputPage $out ) {
	parent::setupSkinUserCss( $out );

	//TODO: load modules from parent of layout, too...
	$layoutClass = self::getLayoutClass();
	$layoutTree = \Skinny::getClassAncestors($layoutClass);
	$styles = array('mediawiki.skinning.interface');
	foreach ($layoutTree as $lc) {
		$styles = array_merge($styles, $lc::getHeadModules());
	}

	$out->addModuleStyles( $styles );
}