wp_default_styles( WP_Styles $styles )

function wp_default_styles( &$styles ) {
	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version

	if ( ! defined( 'SCRIPT_DEBUG' ) ) {
		define( 'SCRIPT_DEBUG', classicpress_is_dev_install() );
	}

	if ( ! $guessurl = site_url() ) {
		$guessurl = wp_guess_url();
	}

	$styles->base_url = $guessurl;
	$styles->content_url = defined('WP_CONTENT_URL')? WP_CONTENT_URL : '';
	$styles->default_version = classicpress_asset_version( 'style' );
	$styles->text_direction = function_exists( 'is_rtl' ) && is_rtl() ? 'rtl' : 'ltr';
	$styles->default_dirs = array('/wp-admin/', '/wp-includes/css/');

	// Open Sans is no longer used by core, but may be relied upon by themes and plugins.
	$open_sans_font_url = '';

	/* translators: If there are characters in your language that are not supported
	 * by Open Sans, translate this to 'off'. Do not translate into your own language.
	 */
	if ( 'off' !== _x( 'on', 'Open Sans font: on or off' ) ) {
		$subsets = 'latin,latin-ext';

		/* translators: To add an additional Open Sans character subset specific to your language,
		 * translate this to 'greek', 'cyrillic' or 'vietnamese'. Do not translate into your own language.
		 */
		$subset = _x( 'no-subset', 'Open Sans font: add new subset (greek, cyrillic, vietnamese)' );

		if ( 'cyrillic' == $subset ) {
			$subsets .= ',cyrillic,cyrillic-ext';
		} elseif ( 'greek' == $subset ) {
			$subsets .= ',greek,greek-ext';
		} elseif ( 'vietnamese' == $subset ) {
			$subsets .= ',vietnamese';
		}

		// Hotlink Open Sans, for now
		$open_sans_font_url = "https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,300,400,600&subset=$subsets";
	}

	// Register a stylesheet for the selected admin color scheme.
	$styles->add( 'colors', true, array( 'wp-admin', 'buttons' ) );

	$suffix = SCRIPT_DEBUG ? '' : '.min';

	// Admin CSS
	$styles->add( 'common',              "/wp-admin/css/common$suffix.css" );
	$styles->add( 'forms',               "/wp-admin/css/forms$suffix.css" );
	$styles->add( 'admin-menu',          "/wp-admin/css/admin-menu$suffix.css" );
	$styles->add( 'dashboard',           "/wp-admin/css/dashboard$suffix.css" );
	$styles->add( 'list-tables',         "/wp-admin/css/list-tables$suffix.css" );
	$styles->add( 'edit',                "/wp-admin/css/edit$suffix.css" );
	$styles->add( 'revisions',           "/wp-admin/css/revisions$suffix.css" );
	$styles->add( 'media',               "/wp-admin/css/media$suffix.css" );
	$styles->add( 'themes',              "/wp-admin/css/themes$suffix.css" );
	$styles->add( 'about',               "/wp-admin/css/about$suffix.css" );
	$styles->add( 'nav-menus',           "/wp-admin/css/nav-menus$suffix.css" );
	$styles->add( 'widgets',             "/wp-admin/css/widgets$suffix.css", array( 'wp-pointer' ) );
	$styles->add( 'site-icon',           "/wp-admin/css/site-icon$suffix.css" );
	$styles->add( 'l10n',                "/wp-admin/css/l10n$suffix.css" );
	$styles->add( 'code-editor',         "/wp-admin/css/code-editor$suffix.css", array( 'wp-codemirror' ) );

	$styles->add( 'wp-admin', false, array( 'dashicons', 'common', 'forms', 'admin-menu', 'dashboard', 'list-tables', 'edit', 'revisions', 'media', 'themes', 'about', 'nav-menus', 'widgets', 'site-icon', 'l10n' ) );

	$styles->add( 'login',               "/wp-admin/css/login$suffix.css", array( 'dashicons', 'buttons', 'forms', 'l10n' ) );
	$styles->add( 'install',             "/wp-admin/css/install$suffix.css", array( 'buttons' ) );
	$styles->add( 'wp-color-picker',     "/wp-admin/css/color-picker$suffix.css" );
	$styles->add( 'customize-controls',  "/wp-admin/css/customize-controls$suffix.css", array( 'wp-admin', 'colors', 'ie', 'imgareaselect' ) );
	$styles->add( 'customize-widgets',   "/wp-admin/css/customize-widgets$suffix.css", array( 'wp-admin', 'colors' ) );
	$styles->add( 'customize-nav-menus', "/wp-admin/css/customize-nav-menus$suffix.css", array( 'wp-admin', 'colors' ) );

	$styles->add( 'ie', "/wp-admin/css/ie$suffix.css" );
	$styles->add_data( 'ie', 'conditional', 'lte IE 7' );

	// Common dependencies
	$styles->add( 'buttons',   "/wp-includes/css/buttons$suffix.css" );
	$styles->add( 'dashicons', "/wp-includes/css/dashicons$suffix.css" );

	// Includes CSS
	$styles->add( 'admin-bar',            "/wp-includes/css/admin-bar$suffix.css", array( 'dashicons' ) );
	$styles->add( 'wp-auth-check',        "/wp-includes/css/wp-auth-check$suffix.css", array( 'dashicons' ) );
	$styles->add( 'editor-buttons',       "/wp-includes/css/editor$suffix.css", array( 'dashicons' ) );
	$styles->add( 'media-views',          "/wp-includes/css/media-views$suffix.css", array( 'buttons', 'dashicons', 'wp-mediaelement' ) );
	$styles->add( 'wp-pointer',           "/wp-includes/css/wp-pointer$suffix.css", array( 'dashicons' ) );
	$styles->add( 'customize-preview',    "/wp-includes/css/customize-preview$suffix.css", array( 'dashicons' ) );
	$styles->add( 'wp-embed-template-ie', "/wp-includes/css/wp-embed-template-ie$suffix.css" );
	$styles->add_data( 'wp-embed-template-ie', 'conditional', 'lte IE 8' );

	// External libraries and friends
	$styles->add( 'imgareaselect',       '/wp-includes/js/imgareaselect/imgareaselect.css', array(), '0.9.8' );
	$styles->add( 'wp-jquery-ui-dialog', "/wp-includes/css/jquery-ui-dialog$suffix.css", array( 'dashicons' ) );
	$styles->add( 'mediaelement',        "/wp-includes/js/mediaelement/mediaelementplayer-legacy.min.css", array(), '4.2.6-78496d1' );
	$styles->add( 'wp-mediaelement',     "/wp-includes/js/mediaelement/wp-mediaelement$suffix.css", array( 'mediaelement' ) );
	$styles->add( 'thickbox',            '/wp-includes/js/thickbox/thickbox.css', array( 'dashicons' ) );
	$styles->add( 'wp-codemirror',       '/wp-includes/js/codemirror/codemirror.min.css', array(), '5.29.1-alpha-ee20357' );

	// Deprecated CSS
	$styles->add( 'deprecated-media', "/wp-admin/css/deprecated-media$suffix.css" );
	$styles->add( 'farbtastic',       "/wp-admin/css/farbtastic$suffix.css", array(), '1.3u1' );
	$styles->add( 'jcrop',            "/wp-includes/js/jcrop/jquery.Jcrop.min.css", array(), '0.9.12' );
	$styles->add( 'colors-fresh', false, array( 'wp-admin', 'buttons' ) ); // Old handle.
	$styles->add( 'open-sans', $open_sans_font_url ); // No longer used in core as of 4.6

	// RTL CSS
	$rtl_styles = array(
		// wp-admin
		'common', 'forms', 'admin-menu', 'dashboard', 'list-tables', 'edit', 'revisions', 'media', 'themes', 'about', 'nav-menus',
		'widgets', 'site-icon', 'l10n', 'install', 'wp-color-picker', 'customize-controls', 'customize-widgets', 'customize-nav-menus', 'customize-preview',
		'ie', 'login',
		// wp-includes
		'buttons', 'admin-bar', 'wp-auth-check', 'editor-buttons', 'media-views', 'wp-pointer',
		'wp-jquery-ui-dialog',
		// deprecated
		'deprecated-media', 'farbtastic',
	);

	foreach ( $rtl_styles as $rtl_style ) {
		$styles->add_data( $rtl_style, 'rtl', 'replace' );
		if ( $suffix ) {
			$styles->add_data( $rtl_style, 'suffix', $suffix );
		}
	}
}