YAECA Style Design System (DESIGN.md, Japanese UI)

Design policy: Absolute monochrome — pure white background with pure black text only. An information design that eliminates all decoration, carrying the stillness of a gallery information board - Density: Extremely low. A center-aligned, whitespace-driven layout where most of the screen is white space. Only the business-hours grid and minimal navigation - Keywords: Absolute monochrome, zero decoration, gallery-like stillness, Helvetica + Yu Gothic, hairline rules, global palt application - Characteristics: - Two-typeface system: Latin text (navigation, logo, business info) uses Helvetica Neue,