> ## Documentation Index
> Fetch the complete documentation index at: https://touchdeck.codesft.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Themes & layout

> Colors, scaling, and window behavior

Touchdeck includes preset themes defined in `touchdeck/themes.py`:

* Midnight (default)
* Glacier
* Sunset
* Dawn
* Aurora
* Berry
* Neon

Each theme sets gradients, text/subtle colors, panel/background shades, slider and progress hues. The Settings page lets you switch themes at runtime; changes are applied instantly via Qt style sheets.

## UI scale and opacity

* `ui_scale_percent` scales all Qt widgets (sets `QT_SCALE_FACTOR`); range 25–200.
* `ui_opacity_percent` dims the window for kiosk-style setups; range 50–100.
* Demo mode keeps the window resizable; normal mode opens full screen.

## Displays

On first launch, a dialog lets you choose which display to target and whether to enter demo mode. Choices persist in settings.

## Fonts and rounding

* Rounded corners are controlled by `touchdeck/constants.py` (`CORNER_RADIUS = 24`).
* The UI uses a modern sans stack (`Inter` → `SF Pro` → `Segoe UI` → `Noto Sans` → fallback sans).