code: def p_media_query_value(self, p):
          
          if utility.is_variable(p[1]):
              var = self.scope.variables(''.join(p[1]))
              if var:
                  value = var.value[0]
                  if hasattr(value, 'parse'):
                      p[1] = value.parse(self.scope)
                  else:
                      p[1] = value
          if isinstance(p[1], Expression):
              p[0] = p[1].parse(self.scope)
          else:
              p[0] = p[1]
docs: media_query_value           : number
                                          | variable
                                          | word
                                          | color
                                          | expression