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

Design policy: Based on the FR design system shared with UNIQLO, it expresses "refined, light, grown-up" through lightweight typography that fully adopts font-weight: 300. An EC layout that makes product photography the star - Density: Like UNIQLO, it is primarily product-grid based, but the body text color is #333 (UNIQLO uses #000), giving a softer feel, and the promotional red is also #c93141 (more restrained than UNIQLO's #ee0000), toning down the overall palette - Keywords: Light Weight, Refined, Soft Contrast, Minimal, Grown-up Fashion - Characteristics: - Dominance of weight 300: Both h