I have a bit of a special request: I use the good old framework blueprintcss for a project and would be happy to have a LESS oder SCSS based superset to make existing blueprintcss responsive. I'd love to have this as an open source project, funded by me, and there's a stub available already:
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However, the main objective would be to receive a CSS or LESS/SASS file that extends an existing blueprint site with media queries for mobile phones, maybe as well for tablet sizes.