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When the user taps the 'Open' button, the main interface dims as a 3D mystery box scales up to the center of the screen. The box wiggles energetically while glowing light leaks from its lid, culminating in an explosive burst of light as it pops open. This transitions into a clean modal card displaying the reward. Tapping 'Claim now' dismisses the modal and triggers a fast, sequential counter animation in the top-left corner, incrementing the user's total balance.
