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

Design policy: A white base with teal green #0bb7ae pill CTAs and warm illustrations, expressing the reassurance and friendliness of "anyone can open a shop easily" - Density: Hero and section headings are large (48–56px) and airy. Body line-height is a standard 1.3, and proportional tightening via palt gives the whole thing a crisp feel - Keywords: teal green, friendly, pill CTA, Gilroy × TazuganeGothicStdN, palt applied globally - Characteristics: - Gilroy (geometric sans-serif) for Latin display type, TazuganeGothicStdN (Tazugane Gothic) for Japanese. Gilroy's roundness and TazuganeGothicSt