Color theme
Palette only — Signal, Day, Phosphor, Ice… Does not change universe shape.
Color variant
Theme-specific looks (line weight, glow, backdrop). Can also touch layout if the look says so.
custom
Accent color
Defaults to the active theme signal.
Hot color
Busy edges and high-intensity beams morph toward this.
Marker shapes
Silhouettes for files, folders, and people.