Ok I changed the compile rule in Rules.rb and it seems to work.
On rake check though now I get this error:
Sass::CompileError: C:/Ruby32-x64/lib/ruby/gems/3.2.0/gems/nanoc-dart-sass-1.0.3/lib/nanoc/dart_sass/filter.rb:74:in `find_item_for_url': Could not find an item matching pattern `C:/assets/stylesheets/components/font_general` (RuntimeError)
The actual path of _font_general.scss is C:/Users/x86/Documenti/SSSNanoc/ssstatic/content/assets/stylesheets/components/font_general so it seems there is something wrong in how filter.rb builds the url.
Any suggestion on how to fix this?
Thanks.