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When the user taps the 'Free trial' toggle switch, the switch slides to the active state with a green track color. Simultaneously, the primary CTA button at the bottom transitions its label. The 'Upgrade' text slides upward and fades out, while the 'Start 3-day free trial' text slides up from the bottom into place. Toggling it off reverses this motion, sliding the text downward to reveal the original 'Upgrade' label, creating a clear spatial relationship between the states.
