The cylinders can be not leaking, but not pressurizing enough to move fluid.
To test if the clutch arm is broken, push the pedal up and down, and have someone watch in the engine compartment, if the clutch MC pushrod moves in and out with the pedal. If not, the weld right there at the bellcrank is usually where it breaks as the weld weakens.
You have to do the above test to see if it's broken; I can't see it from here.
To fix, I would remove the whole pedal box, which is not a small job. Some I think have figured out how to slip a new shaft in there without pulling the whole box out. It's probably written up here on the BB somewhere, as it's a common failure. New shaft is about $70. You still need to check the above symptom. If the shaft isn't broken, replacing it won't solve your problem.
It is a LHD Spider, correct?