扁平化风格演示文稿生成

Simple and clean flat design. Place figures and icons drawn with uniform black outline lines, using pastel accent colors partially. Unify the line thickness as much as possible to create a modern impression. Emphasize rounded shapes and a soft impression. Diagram-centric composition (e.g., Venn diagrams, bar graphs, speech bubbles) with a friendly tone suitable for materials viewed by students and young people, or for social media. Maximize white space, focusing on visibility and balanced design.