Include Multiple CSS in Redux Framework

[admin]

I'm creating a new wordpress theme in which i used redux framework for creating the theme's options page.I passed my style.css path in function compiler_action()

function compiler_action($options, $css, $changed_values) {
            global $wp_filesystem;

            $filename = get_template_directory().'/style.css';


            if( empty( $wp_filesystem ) ) {
                require_once( ABSPATH .'/wp-admin/includes/file.php' );
                WP_Filesystem();
            }

            if( $wp_filesystem ) {
                $wp_filesystem->put_contents(
                    $filename,
                    $css,
                    FS_CHMOD_FILE // predefined mode settings for WP files
                );
            }
        }

it worked but in my wordpress theme there is number of css include in my theme directory css folder how i include that folder also so that all css update dynamially.Please help me if you have any idea about this.

Thanks