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

Design policy: A practical and approachable design built around LOFT Yellow #fdd000 as the symbol color, with a white background + system fonts (Yu Gothic / Hiragino Kaku Gothic / Meiryo) - Density: Body text at line-height 1.4, relatively compact. An EC-oriented layout with high information density, such as news lists and product grids - Keywords: LOFT Yellow, system fonts, practical, approachability, the liveliness of a variety store - Characteristics: - LOFT Yellow #fdd000 is used for the header background and brand icon, serving as the eye-catcher for the entire page - No web fonts used. A