Strong rule: style --- 3D Pixar ---. 3D Pixar style. The professor is playfully covering part of the equation on the board with his hand. The visible text on the board says in Russian: 'НЕПОЛНЫЕ УРАВНЕНИЯ: b = 0 или c = 0'. Soft, inviting lighting.
Character appearance reference (MUST match exactly):
- Профессор Архимед: A friendly, energetic math professor in 3D Pixar style. He has messy white hair, round glasses, a neat beard, wearing a tweed jacket with elbow patches and a bright bow tie. Expressive face, warm smile, animated gestures.
