At the risk of stating the obvious, if your brake fluid was full and then was on minimum you must have a leak somewhere. When did you last change anything on the brakes? I once got a very slight leak after changing one of the front callipers. It wasn’t leaving a pool of liquid, more a fine mist when in use.
If you’ve lost the contents of the reservoir while parked there’s probably a blown seal somewhere. Maybe in one of the callipers if the brakes otherwise feel normal. Otherwise the master cylinder.
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