Why are media queries not responding to screen sizes?

Question

Sass

Good afternoon.
I write styles in Sass, respectively, I connect media queries with a separate document _media.sass to my main style document main.sass, write @ import "media", insert it at the end of the style document, as expected and ..
when writing styles for a specific screen, for example , I prescribe media (max-width: 480px)
styles are applied to absolutely all window sizes. Maybe I'm connecting wrong somehow? The question is very important to me.

Answer 1

It's worth looking at the compiled code.

Answer 2

@media only screen and (max-width: 480px) { }