Users are reporting they can't play offline either. The people at Steam are merging all the threads about it but there's still no official comment about it or an ETA for it being fixed. I can't launch Steam at all.
https://steamcommunity.com/discussions/forum/1/
UPDATE: Looks like it is back up for everyone.
https://steamcommunity.com/discussions/forum/1/
UPDATE: Looks like it is back up for everyone.
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