CSS pre-processor with a possibility to define variables in a @media query

Question

Currently, I am using LESS as my main CSS pre-processor. I have (and I am sure a lot of people have this need) to define variables in a @media query like:

Answer 1

Let me answer more directly the question:

"Is it possible to achieve this in any other CSS pre-processor, or we are doomed to override the .myElement within each media query?"

The answer actually resides in the question. Because LESS (and other similar tools) is a "pre-processor," the @media means nothing to it at compilation time, because it is not looking at the media state of the browser for its preprocessing. The @media state is only relevant after the preprocessing, at which point any @someVariable has already been calculated. This is why what you are trying to do cannot work. Your @myVar can only be output as a single value in a CSS style sheet, and that output occurs before the browser state is ever evaluated by @media.

So it does not have to do with the "global" or "local" scope of a media query, but the fact that LESS compiles the code into CSS utilizing the variables, and it is the CSS (not LESS) that pays attention to the @media query information.

For some further discussion on building media queries with LESS in such a way that they are all together and not scattered throughout the code, see this question.