A prototype of the colour setup on the admin Site > Theme page. Theme page is a mock of that page: press Quick setup… to open the colour dialog, change things, then Apply to fill the six colour fields. Presets lists 58 ready-made light and dark sets. Every tile is drawn with the rules of the real Preview.
Set the visitor site's default mode and colors for light and dark appearances.
Earlier versions: palette and slider page · research version with the three methods. Design issue and data: cheesecave-admin#23.