steam and missing adsl connection...help

[pupaxx]

Hi all, I ask for your help:
until yesterday I did not find interest in discussions about 'steam' or not 'steam'. It never was an issue to be permanently logged to a net service cause I have (..had) a Adsl flat account.
I say until yesterday cause a major damage occurred to the telephone wiring system of the whole building where I live. So for the next 20 days I'll be off line from CloD servers. I thougt it wasn't no more than a boring situation until I realized that I can't even play Clod in single player mode cause 'steam' rejects my attempt to log in 'off line' mode.
How to solve this situation? How to play in single player mode bypassing steam?
Cheers