Create a vertical 9:16 poster for a Pakistani teen tech event called 'BUILD NIGHT'. Bold sans-serif type reading 'BUILD NIGHT' at the top, subtitle 'Karachi · Friday 8pm'. Style: risograph print, mint + midnight palette, subtle grain, high contrast. The typography must be crisp and legible — no gibberish letters.
Run in ChatGPT. Ask it to redo the text if any letter looks off. That's the loop.