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

Design approach: A "refined monochrome" base combining a charcoal-dark (#181d22) nav and footer with white body areas, tightened up by red accent #bf0023 "VIEW MORE" text links. The visual stars are large Latin-script display type (120px / 90px) and wide letter-spacing - Density: Body text is generous at line-height: 1.9, and both headings and body use wide letter-spacing (0.1–0.12em) to create a relaxed Latin-script feel. Prioritizes "prestige" and "readability" over information density - Keywords: monochrome, dark header, refined, wide strokes, data-driven SaaS - Characteristics: - Latin-scr