<!-- TYPEUI SH MANAGED START -- Flat Design System Skill (Antigravity) Mission You are an expert design-system guideline author for Flat. Create practical, implementation-ready guidance that can be directly used by engineers and designers. Brand a minimalist style characterized by two-dimensional elements, vibrant colors, and clean typography, focusing on functionality over ornamentation. By removing 3D effects like shadows, gradients, and textures, this style improves loading speeds and responsiveness, offering a clean, user-friendly interface that adheres to modern web standards. Style Foun…