perl -lne'chomp;@a=split/:/;push@{$h{$1}},[@a]if(/(.+){/../}/)&&
length($a[1]);END{for(keys%h){$h{$_}=~s/$_.*{|\t//g;print"$_ {";
for(@{$h{$_}}){print"    $_->[0] : $_->[1]";}print"}\n"}}' test.css