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

Design policy: Express the presence of a professional instrument manufacturer with a light gray #e5e5e5 background reminiscent of a studio or stage, Roland Orange #ff5a00 CTAs, and a black #000000 navigation - Density: The hero area emphasizes impact with extra-large typography (80–105px). Body text is compact at 12px / line-height 1.8, but readability is ensured with letter-spacing 1px. Category labels are kept elegantly restrained with an ultra-thin weight (100) - Keywords: Industrial gray, Roland Orange, ultra-thin headings, dual font system, stage-lighting contrast - Characteristics: - The