Duolingo 2 Day Streak Animation

The animation begins with a desaturated gray flame and the number '1'. The flame scales up and bursts into vibrant orange and yellow colors, accompanied by a small explosion of square particle sparks. Simultaneously, the number '1' scales down and is replaced by a bouncing orange '2'. Following this initial burst, additional UI elements slide up from the bottom in a staggered sequence: first the 'day streak' label, then a weekly progress tracker that populates with checkmarks, followed by a warning message, and finally a prominent blue action button.