Styles color code?

Hello,i created this topic since I couldnt find the meaning of the color from the selected style. So far i thought if it was blue it was activated (the caracter used it for attacking), red if it was selected but it couldnt be used for a reason like incorrect weapon or equipment restriction, and that it changed to red normal (instead of the style name) if the weapon wasnt valid.

But for what i have seen, if i dont have a weapon equipped it stays blue (any kind of style like unarmed or weapon), if i choose a weapon style and i equip the respective weapon (any from the help section of the style) it changes to red, so far the change from the style name to “normal” red indicates that the style isnt used, is my only correct assumption.