Pattern or strategy for showing hierarchical response content?

I'm expanding my app's capabilities from this:

...to displaying all the rules that were applied, results for each rule, rule description, and link to more info.

I'd really appreciate pointers to apps which solve this kind of detail/detail display well. Here is how a couple of other apps solve this problem. I feel like there can be better ways to do it:

Edit: here's an interesting solution on duolingo.com: