Offset surface edges


I want to offset a surface edge inside a surface. I have two problems doing that. First, in the corners, it gives me weird edges and second the inner curve offset outward instead of being inside the surface.
I appreciate if you can guide me on how to solve it.

Best, (163.2 KB)

Offset surface (160.4 KB)

hope it helps~

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Thanks a lot, I didn’t expect to have this long process