reference breakpoints in css

I am trying to do some conditional hide/show logic based on breakpoints, I saw this file: https://github.com/radix-ui/themes/blob/main/packages/radix-ui-themes/src/styles/breakpoints.css

is there any chance we can reference this variables in the codebase of a project using the theme library? should I just redefine some variables based on the values of those variables?