rhazdon/hugo-theme-hello-friend-ng ? reverse-engineered prompt

Build me a clean Hugo blog theme that feels simple, modern, and easy to start using right away.

I want a homepage and post layout that works well for writing articles, with a nice reading experience, good typography, code highlighting, and a mobile friendly design. It should support light and dark mode based on the user’s system preference, but also let them switch if they want. Please include a header with a logo and menu, social links, sharing buttons, and a language switcher that can be turned on or off. I’d also like support for things like featured images, audio in posts, and comments through common services.

Make it feel polished out of the box, with sensible defaults and example content so I can plug it into a Hugo site and start publishing quickly. If anything about Hugo setup or current best practices matters, look it up online and follow that.