Mitsui Fudosan Style Design System (DESIGN.md, Japanese UI)

Design policy: A dignified, large-typography-driven design that conveys the prestige of a premium real estate developer. Uses two distinct font systems: a serif-style display font (Optima) and a sans-serif body font (New Cezanne) - Density: Spacious, large-scale visuals. 90px giant headings and full-bleed imagery express a sense of spatial expansiveness - Keywords: Authoritative, sophisticated, premium, dual typography systems, sharp - Characteristics: Buttons and cards all have no rounded corners (radius 0px). The contrast between the serif-style display (Optima) × sans-serif body (New Cezann