It's down for me, too. Actually, not completely down, I get this error code as a result of all their XHR calls:
> {code: 353, message: "This request requires a matching csrf cookie and header."}
> {code: 353, message: "This request requires a matching csrf cookie and header."}
I can still view pages when logged out, but trying to log in on an incognito window also fails (I didn't look at the console tho)