Language and theme
English and Traditional Chinese on every public page. Light and dark follow your choice or the system.
Pastors already switch language and brightness on church tools. Kairos keeps both in the header: a locale switch and a theme toggle, including on login.
Language
English is the default. Traditional Chinese is the other locale. The first visit can follow the browser; after you choose, that choice is stored. Workspace copy follows the same switch.
Theme
Light is a white workshop. Dark is equal rank, not a washed-out invert. The first visit can follow prefers-color-scheme; after you choose, the stored theme wins.