Windows are UI elements opened when interacting with certain environment items, like accessing the terminal or a piece of tech that is not detailed enough with model & texture alone.
Most windows should be interactable, movable and closable. I suggest the design that retains the dark and semi-transparent work area, but has a distinct header with a recognizable close button and a readable name. This header should be wide enough to click on to drag the whole window through the screen.
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example
The text within should be bright and active elements/buttons highlighted. Said color should be brighter then the work area of the window, yet overall diluted to not distract the player too much and spare their eyes.
The window can also have interactable elements within. They should be bright and readable enough on the window's background and, preferably, should retain some vector style. See an airlock control panel from SS14, for example:
A similar window should appear when trying to hack the airlock. Note the flat colors and vectorized edges of every object.
It’s planned to be made out of several individual interactive parts: light bulbs and wires, with several versions of each (uncut, cut or fixed wire, lit or unlit light bulb).
The face is a orthographic render of the character model.