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

Design policy: A two-track system built on Tazugane Gothic (Morisawa) for a Latin-like modern Japanese gothic as the foundation, with the in-house designed "JINS Next" applied to English headings. A D2C platform fully tokenized via CSS variables. - Density: Body text 16.5px / line-height 1.66 / letter-spacing 0.01em. Balances readability with the density of the product grid. --text-letter-spacing: 0.01em is fixed as a variable. - Keywords: Tazugane Gothic, JINS Next, brand red #ca2029, complete CSS variables, product e-commerce, neutral multi-step grays - Characteristics: - CSS Custom Properti