protected function _convert( $css ) {
		$css = $this->_clean( $css );
		$css = explode( '}', $css );
		$css = array_filter( $css, 'strlen' );

		foreach ( $css as $key => $val ) {
			$css[ $key ] = explode( '{', $val );
		}

		foreach ( $css as $key => $css_block ) {
			$css[ $key ] = $this->_create_css_block( $css_block );
		}

		return $css;
	}