First IMO stairs should be the same color as the hardwood at the bottom fthe staircase not that dark color . I have no clue what you are doing upstairs but I guess I need more info right now is there hardwood under the carpet upstairs or what?

Upstairs plywood in a loft area-
Another living room so to speak- so to keep the continuity of the runner on the steps with the new stain im placing hardwood and the same stair runner in the hallway up to bedroom doors and as
An area rug in the loft. The ask is what color/ideas on transitioning the woods or should i just go with the onyx?
Its a project right? Redoing all
Stairs, replacing all carpets- So eventually we will get to the main floor hardwood but another day- for now i will work off this photo and gathering opinions on the wood match.

So I understand the floors on the main floor will be done then to match the stairs ????