I will preface this with I only use it’s web interface so I’m unsure of an app and you can judge from the image on their site if it is modern enough for you. I’d describe it as simple overall but it does have dark themes.

I’ve overall had a good experience with freshrss and their docker container https://hub.docker.com/r/freshrss/freshrss.

https://freshrss.org/

It’s nice to be contemplated for once.