Is there a way to do an if in SCSS for the width of the screen?

Question

Sass

I have a certain value calculated in SCSS - depending on the width of a certain block. But the width of the block changes depending on the width of the screen (media queries).
Is it possible to write something similar in SCSS?

if ширина экрана > 768, то
    var_1 = 500.
if ширина экрана < 769, то
    var_1 = 300.
Конец if. 

var_2 = var_1 - ... (какой-то другой код)

Answer 1

media only screen and (max-width: 600px) {
$width: 5em;
}
media only screen and (max-width: 700px) {
$width: 50em;
}