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When the user taps the card, it executes a realistic 3D horizontal flip. As the card rotates 180 degrees, the front content (mood label and large abstract shape) seamlessly crossfades into the back content (detailed description, smaller shape, and check-in history). The rotation has a subtle springy overshoot at the end of the transition, giving the card a physical, tactile quality. Tapping again flips it back to the front state with the same fluid motion.
