Someone correct me if I'm wrong, but it seems like it should be fine. Copyright applies to specific concrete representations and not things like abstract underlying ideas.
Yes. It applies to what you do / make. You can’t copy (parts of) the written text, but you can act (write your own interpretation) with the ideas in that text.
“Copyright is intended to protect the original expression of an idea in the form of a creative work, but not the idea itself.”