Keep the shell monochrome — white (light) / #141414 (dark) — with #0099FF as the only accent
Use blue for selection outlines, links and primary buttons; tint with alpha (#0099FF1A) for fills
Keep the Designer canvas chrome dark even in light mode — it's a product cockpit
Use Inter everywhere; JetBrains Mono only for layer names, dimensions and CSS values
Show real product vocabulary — Canvas, Layers, Breakpoints, CMS, Publish