Strong rule: style --- 3D Pixar ---. Floating 3D glowing numbers forming a math proportion in the air. Bright neon arrows are crossing in a giant 'X' shape between the numbers. Professor Leo is smiling in the background.
Character appearance reference (MUST match exactly):
- Профессор Лев: 3D Pixar style, young energetic male teacher, around 30 years old, wearing round glasses, a cozy green sweater over a white collared shirt, neat brown hair, kind smile, expressive and friendly face, highly detailed, soft lighting.
