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Have you looked at the Hugo themes and the tags on the right side?

Here are themes tagged Portfolio: https://themes.gohugo.io/tags/portfolio/

I actually find many themes that are non-blog based in there.

A theme isn't exactly what's asked... Themes are just... A lot of work put into making an unwieldy system meant for blogging look like something else.

From what I have seen, Hugo themes are a combination of visual makeover plus some even requiring a certain structure of site content. Here's an example theme DocDock[1] that is not just a blog made to look like something else.

Again, YMMW.

[1]: https://themes.gohugo.io/theme/docdock/content-organisation/

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