1993 Other Mitsubishi Models Clutch

I have a 3000GT N/A with 69,000 miles everything was fine. Untill I pushed in my clutch at a stoplight, the clutch pedal stayed pushed all the way in. Now I can't drive it, the pedal moves from the out position to the floor with no resistance (and doesn't pop back out). The car will start but will not shift (it grinds). Clutch fluid is now full but was empty after the problem (was it empty before or did it leak out, I do not know). Any info would be appreciated thanks guys.