Sebastian, thanks, you gave the right answere for the wrong question 🙂
Not to be present = not being even loaded, that is why I wrote about separate file.
Like choosing page_id will bring another file like /wp-content/micro-themes/active-styles_pade_id.css or some similar behaviour
Ah I see, sorry I misunderstood. That isn’t possible right now, but it’s a high priority for the future. You will be able to assign MT folders to certain pages, or types of page (e.g. post category). But right now, all CSS is written to a single stylesheet:
You would need to split this apart manually right now. But that would be a bit fiddly of course.