A 29-year-old man presents with facial puffiness, dark urine and ankle swelling. He had an impetigo-like skin infection 18 days ago, and his blood pressure is 162/96 mmHg. Urinalysis shows 3+ blood and 2+ protein, microscopy shows red-cell casts, serum C3 is low and serum C4 is normal. Which diagnosis best explains these findings?
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