Reorganised & commented SASS variables
Added light-shade colour variable
Switched current archive year link bg to $inactive
Added rgba color tints
Styled archive year links block
Set rgb fallback background to transparent

(for browsers without rgba support)
Resized h3 from 12px to 14px
Tweaked tickets notice to match upsized h3
Added small bottom-margin for archive years header
Bumped up bottom margins on archive modules
Regenerated style.css