Failed to validate certain font family in CSS file

Hi,

We ran into an issue with following css stylesheet:

body {font-family: 宋体-GB18030; font-size:14px}
li {margin-bottom:14px}
code {font-size:14px}
input {font-size:12px; margin-top:10px; font-weight:bold}

where the validator would indicate there is a lexical error in the "body"
line as it couldn't interpret the 2-byte Chinese font characters, even
though it does exist in the local Windows system.  We also tried to add
"@charset GB18030" at the top, and that didn't help either.  Is this a bug
with the validator, or is there other specification that we're missing?
Thanks very much.

Regards,
Michael

-- 
Michael Xia
mxia@aptana.com

Twitter: http://twitter.com/aptana
Facebook: http://aptana.com/facebook