CMS-bound Accordion w/ auto-close

Greetings everyone,

I’ve frustrated myself trying to do something that I know should be possible, and now I’m stubbornly on a mission to solve it.

I can do an accordion from CMS no problem. What I can’t figure out is how to get open accordion elements to close when a second element is chosen. I can easily get it so that each one opens and stays open unless clicked to close, but how can I get them to close each other as they open.

I’ve seen various ideas, but now I’m full circle and I haven’t been able to make them work.