A vibrant, warm 3D animated cartoon for children, with bright colors, smooth natural animation, cute expressive characters, large eyes, joyful magical atmosphere. In a colorful sunny city, Léo, an 8-year-old boy with short slightly tousled brown hair, large brown eyes, and a smiling face, walks down the street with Mimi, a small orange cat with a white belly, large green eyes, and a fluffy tail. Léo wears a blue-and-red superhero suit, a bright yellow cape, and a small golden star on his chest. Suddenly, a tiny glowing golden star gently falls from the sky behind the rooftops. Léo stops and looks upward in amazement while Mimi stares at him with wide eyes and gives a funny "Miaou!" The camera smoothly moves from their delighted faces toward the sparkling magical star glowing in the distance. Keep Léo and Mimi's faces, hair, clothes, colors, proportions, and appearance consistent. Add subtle golden sparkles, soft cheerful adventure music, and playful sound effects. No scary or violent elements, no logos, no watermark. Horizontal 16:9, cinematic camera movement, polished high-quality animation.