# Principles

> For the complete documentation index, see [llms.txt](https://plugins.jetbrains.com/docs/intellij/llms.txt).

* [Data Formats](data-formats.html)

* [Icons](icons-style.html)

* [Layout](layout.html) * [Groups of Controls](groups-of-controls.html)

* [Mnemonics](mnemonics.html)

* [Platform Theme Colors](platform-theme-colors.html)

* [Typography](typography.html)

* [Validation Errors](validation-errors.html)

* [Window Sizes](window-sizes.html)