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During the onboarding flow, the interface transitions from a card selection screen to a clean focus state. The Duolingo owl mascot (Duo) smoothly morphs from a neutral standing pose into an enthusiastic 'ready' pose holding a book and pencil. Simultaneously, a speech bubble containing motivational text scales up with a playful spring overshoot above Duo, and the bottom 'Continue' button transitions from a disabled gray to an active green state, signaling readiness to start the lesson.
