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Error state
What the screen shows when something has gone wrong.
An error state appears when an action fails — the network is down, the form has invalid input, the server returned an error. It tells the user what happened and what to do next.
Plain language beats error codes ("We could not save your changes" beats "Error 500"). Always offer a clear next step: retry, contact support, or undo. Never just say "Something went wrong" without help.