An editor for working with Claude Code. One slate shell, one amber accent, IBM Plex Mono for everything that is code or label. Every layer below uses the same four surfaces, the same 24px row height and the same selection marker: 2px amber on the left, fill one step deeper.
Amber is a reservation: active toggle, selection marker, cursor, the blinking period and the counts in the status bar. Never an amber surface as decoration.
Six colours, all muted. No green for good and no red for bad — the diff reads on shape and on the 2px rule, not on alarm.
No movement, no shadow, no scale. Colour only, 160ms. The only animation in the whole editor is the blinking cursor and the period in the mark.