Good posts above. It’s also possible for a clutch MC to leak internally, so there’d be not visible leak. That would result in the same symptom, and is a pretty common thing and just have happened to occur at the same time, unrelated to the brakes. And this is usually fairly inexpensive to fix.
Coincidentally, the clutch on my early 90’s Corolla just started doing the same thing. I haven’t done any work on the brakes, or done anything with the clutch hydraulic system in several years. The current clutch MC is over 10 years old, so my plan is to just replace it. I tried to buy a replacement part the other day, but the parts place I go to is configured so everyone, no matter what they want, has to stand in the same line. I was behind a bunch of customers wanting to ask dozens of questions about air fresheners and windshield wipers, didn’t have the patience to stay and make my clutch MC purchase. I’ll have to go to another parts store where they have separate counters, one for repair parts where the most knowledgeable staff are, and another counter for stuff like air fresheners, where they have their trainees working.