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

Design policy: Based on white and warm beige, with a calm muted green #669988 placed as the brand color, and fully pill-shaped CTAs (radius 24px) expressing a soft, approachable lifestyle tone - Density: Throughout, line-height is a very generous approximately 1.8. From headings to body text and captions, a consistently wide line spacing creates an airy rhythm - Keywords: natural, warm, geometric sans-serif, pill buttons, lifestyle/sustainable - Characteristics: - futura-pt (Adobe Fonts' geometric sans-serif) is used across the board for Latin text. English labels such as "GREEN ITEM", "SERVIC