Apologies if this is already possible but I don’t see how. It would be great if we can define media queries, i.e. CSS conditional on e.g. screen width.
It is possible. (check the top of the manual window and you will see the {breakpoints}.
But tbh it isn’t ideal at the moment. If you edit a breakpoint size, your variables will disappear, which is very confusing.
Please see this page for more info on breakpoints/media queries: https://docs.coreframework.com/navigating-the-ui/breakpoints