Passive skill tree color line meaning

I can't seem to find an answer to what the color lines mean



Bright line: Is your normal line skill point

Red Line: Weapon set 1

Green Line: Weapon set 2

Purple Line: I can't find an answer for this line.

Same question.

And i can allocate them only on controller for some reason..

I also see a light blue line on some builds.

No answer?

I actually have experience with the purple line you are talking about. Oddly enough, the game does allow you to allocate passive points that you don't have, it seems like it's up to 5-7 of them. From my general guess, it's allowing you to preset the next skill points when you lvl up, allocating them in the order that you placed them with each lvl without having to lvl up and then allocate them. This is reflected by a purple line