You asked
Does it work offline?
The short answer
Yes. It runs entirely on your own computers and makes no network calls, so it works with the internet unplugged.
That includes the AI: the models run on your hardware, so drafting, checking, and searching all keep working with the connection down.
This matters most on the days you least control. An outage, a storm, or a cut line stops cloud software cold; an office running on its own machines finishes the docket.
If your IT wants the strongest posture, the system can run fully air-gapped, with no path to an outside network at all.