240sx S13 Clutch Problem Help!

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Hey br/o/s.

This is probably a dumb-as-fuck question, but I'm still learning cars, let alone my car, so bare with me.

A couple weeks ago, I was driving in some good ol' Los Angeles stop and go traffic to meet up with a friend. A 20 minute drive basically ended up being a 50 minute drive. Anyways, while I was driving, my clutch would occasionally drop to the floor and not come back up, and I would have to smash the clutch in as hard as I could and pull with all my might to get the car into gear just so it could gtfo. Eventually, and thankfully, as I got onto the freeway exit, my car would NOT go into gear, clutch all the way down and the more I tried to pull it, my car would slowly die until it would stall out.

I got it towed home and haven't touched it since as I've been busy with work, and been having to take the train everywhere I go, but I miss driving it and want to fix it myself. What's wrong with it? The car turns on and sounds fine and everything, but the clutch just falls to the ground and I can seem to be able to put it into gear now, but I can't actually get the car moving. Here's a video I took of the problem: https://www.youtube.com/watch?v=O0Ch7oqlNtg

Now, this is more than likely why, but I neglected to fill the master clutch cylinder reservoir with anything since I bought it, as it always just slipped my mind. Could it just be that it needs more fluid in it? Or, I was just thinking I need to replace the entire clutch master cylinder as some others have told me. It's a 1990 Nissan 240sx S13, by the way. Pic related is her.