How to deal with continous staircase with seating, landing, and slope

Grasshopper
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stairv1.gh (31.4 KB)

v1v2
v1v21243×804 169 KB

133934h5af1l2pvpglxv2x
133934h5af1l2pvpglxv2x1579×857 175 KB

I find a picture which show staircase follows the form of two curves, I did a straight one, I just want to know how to deal with the curve one, I have tried the morph logic, but it’s not the quality which the picture shows. If someone could show some logic? Thanks.

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Thanks, Michael, maybe I could make it out combining the definition with tweencurve.