1♣ is 12-14/17-19 balanced or 12-21 natural.
2♣ shows diamonds, weak or GF.
3♣ shows a hand afraid of missing game opposite the weak (5-9) diamond hand, should probably deny a 4-card major.
3♠ shows GF with 5+ diamonds, 4+ spades.
4♣ is natural.
What should South's bids mean now?