Changing fonts

I'm now working on a site thpc.cloudaccess.net/index.php/en/ using the Architecture template.

I am trying to replace the template’s font with some more classic ones as requested by the client. They would like me to change current font styles to Calibri, Gills Sans or Myriad Pro, all three very easy to find. I’ve been trying to locate the place where this change can be made, but unsuccessfully so far. I was wondering if you could advise.If it's to do with CSS could you please detail the CSS changes I would need to make.

Cheers

Mark

All font definitions are in files in templates css/ folder. You can just go by simple logic , just open then all and do simple replacement of existing font definitions. Most of them you will find under template_css.css,layout.css, template_css.php and files in /styles/styleX.php