Innocent means that neighbor kept the fire, so the line they left is true. Guilty means they let it die, so the line is false. The room has one pattern that satisfies every line together.
A line stays sealed until you have marked every neighbor it names. Lines about a whole bench name nobody, so they are open at the start. Marking a person unseals the lines that were waiting.
Yes. The UTC date chooses one hearth for everyone, from 00:00 UTC. Practice draws a spare hearth and does not replace today. The archive lists dates that have already opened.
It names one seat the open lines already force, and whether that seat is innocent or guilty. It does not fill the mark, and it does not show the rest of the room. Hints you take are counted on the result card.
Marks stay in this browser, one entry per date. There is no account and no game server. The site is static files, with no third-party scripts, fonts, or trackers.