The OpenTUI has one appearance authority. Home, application chrome, sidebars, tabs, pane headers, status bars, dialogs, and overlays all consume the same semantic token snapshot.

Choose light, dark, or system from the command palette's Settings group. A switch publishes one new appearance generation and repaints every app-owned surface atomically.

Terminal content is different: applications inside tmux own their ANSI colors. tmux-ide preserves those indexed and truecolor cells rather than recoloring them to match the application chrome. That means a dark-only program can remain dark while the surrounding tmux-ide chrome is light; it is the program's chosen palette, not mixed application theming.

Fresh sessions advertise:

TERM=tmux-256color
COLORTERM=truecolor
COLORFGBG=15;0

NO_COLOR is removed for newly launched shells. Programs that were already running retain the environment with which they started.

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