2004 Mazda 3 manual wont shift into gear. If I start in neutral. Engine sounds good. But it won't go into any gears. Was driving and the clutch started to feel strange. Lost pressure but now its spongy. Please help on where to start troubleshooting. Thank you.

 

Check fluid level in master cylinder reservoir. Check for leaks from both Master & slave cylinders & hydraulic pipes & hoses.