Build a Tamagotchi-style virtual pet in the browser (single HTML page, no external assets). An original, impossibly cute round blob creature with big sparkly eyes and rosy cheeks lives inside a pastel egg-shaped toy. It idles, blinks, bounces and wobbles on its own, and reacts to everything: feed it and it munches while hearts pop out, play with it and it does a happy spin, pet it on click and it giggles and blushes, turn the lights off and it curls up asleep with little Zzz. Hunger, happiness and energy meters, tiny sound effects, and it grows into a new form after a few minutes. It should feel adorable the moment it loads.