This interaction showcases a premium pricing and subscription screen for the Whistle app, transitioning between 'Pro' and 'Ultra' tiers. Tapping the segmented control tabs triggers a fluid, full-screen theme transition where the primary accent colors, background gradients, button states, and feature checkmarks morph seamlessly between a warm orange (Pro) and a cool purple (Ultra). The screen also features a top carousel displaying app mockups that users can swipe through, complete with synchronized text crossfades and sliding page indicators. A sticky bottom CTA button remains anchored, adapting its color scheme to match the active tier.

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