Controller status
Expect keyboard and mouse to be the primary supported setup. A controller may work for gameplay, but prompts, menus or specific actions may still require keyboard and mouse.
Steam Deck and Linux
The official FAQ does not support Linux or Steam Deck. Proton behavior can change and is not presented here as an official solution.
Accessibility settings
Steam lists adjustable text, camera comfort, color alternatives, contrast, volume and subtitle-related accessibility categories. Check the live client for the exact options available.