Grid Style Sheets – Replace CSS with a Constraint-Solver
From their demo: structure.gss     @h |-(#message)~-~(#follow)~-~(#following)-(#followers)-|
     in(#profile-card)
     gap($sgap)
        !strong {
          &[top] == &:next[top];
        }
      }

If you inject stuff like this into a project, make sure you're doing it solo. 'cause if you're on my team, i'll slap you.WTF is this voodoo? Less and Sass aren't complex enough? CSS isn't hard enough to work with as it is?