If it’s so easy why not just give the correct enqueue for my_media.css?
@import url is not the same as enqueeing, and doesn’t work for my_media.css, correct.
I studied long and hard and shared a working fuctions.php in this thread to enqueue style.css.
Both the template and stylesheet directory referrals lead to php errors and a blank site.
I wish I had the answer, I bet am far from being the only one fighting this. Thanks anyway.