My clutch randomly went soft.... NO idea whats wrong. More info below.

What is your question?

I was just driving back home from the mall, when suddenly my clutch went soft. It usually has free play where i can rest my foot on without engaging the clutch. But it randomly went completely soft, even if i rested my foot on it like usual, it just sunk almost to the bottom. For the first time, i had to completely depress the clutch all the way to the end to change gears. As well, i struggled to put it into 1st and 2nd, i managed it, only after pushing the gear stick hard.... I didnt notice any leaks or anything, but I immediatly took it to the service garage about 3 km's away, so I didnt do much driving after it happened. No news from the garage yet, but what are the possible symptoms and the possible cost of the situation. Thanks.