Hi Joe, I think you want the $media parameter in the wp_enqueue_style function. Like this:
wp_register_style( 'style',
get_stylesheet_uri(),
array(),
'',
'screen, handheld' );
wp_register_style( 'enhanced',
get_stylesheet_uri() . '/styles/enhanced.css',
array(),
'',
'screen and (min-width: 40.5em' );
Here’s the documentation: https://codex.www.ads-software.com/Function_Reference/wp_enqueue_style
Good luck.