Fibonacci Sequence — Engaging Education Card Template

Extract the core theme and key points from the input 【fibonacci sequence】 and generate an educational infographic in one of two styles: (A) Cute digital cartoon style: horizontal 3:4, pure white or very light background, pastel macaron palette, soft rounded lines; organize info with rounded rectangles, flowcharts, and arrows; add a few personified cute icons; clear rounded sans-serif cartoon typography; highlight keywords with generous whitespace. (B) Chalkboard scientific sketch style: vertical 3:4, dark gray/near-black textured chalkboard background; main elements in white/gray chalk strokes with cross-hatching; small vivid accent colors to highlight key graphics/notes; dense but clearly guided; text in irregular hand-drawn chalk lettering. Default language follows the input language.