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Most likely cause is the master cylinder, especially if there is no sign of a leak. This is a common problem unfortunately. If the slave fails it usually leaks fluid into the clutch housing. Prising out the rubber bung at the bottom of the clutch housing will soon show any fluid.
Next time the pedal goes soft clamp the flexible section of the pipe, if no difference it is the master , if the pedal is hard then it's the slave.
Although the clutch shares the same reservoir as the brakes there is a seperate compartment joined to the main reservoir only at the top, so the brakes will not be affected due to loss of fluid from the clutch.
 

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The slave cylinder is sinlge acting, there is only oil pressure on one side (ie. no return?). If it were to fail, surely oil would leak, which could probably be observed by looking into the open area of the bell housing (where the bleed nipple is). Does this make sense?[/b]
That's what I said above. Pull the rubber bung out of the botton of the bell housung and see if any fluid comes out. The likelihood is that your problem is with the master cylinder.
 
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