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I was in the same situation as you. I found it difficult to design my own that works good on desktop and mobile.

So I purchased multiple themes and settled on Landkit[0], which is built on top of bootstrap.

I also purchased Landkit, but eventually found it very heavy. I then essentially remade it on top of Fresh [1]. Code is here if anyone needs it [2].

Landkit looks clean. I'm not using bootstrap but will keep the landkit example in my backpocket.