Use orange #FF6C37 for the Send button and primary CTAs — it is the brand
Color HTTP methods semantically: GET green, POST amber, PUT blue, PATCH purple, DELETE red
Set URLs, JSON, and method labels in IBM Plex Mono — the payload is code
Set headings in Degular (≈ Figtree), UI in Inter
Show status + time + size on every response — the Postman readout