10YC Style Design System (DESIGN.md, Japanese UI)

Design philosophy: A D2C fashion brand with the mission "Enriching both those who wear and those who make." The brand name "10YC" is short for "10 Years Clothing" (clothes you can wear for 10 years). To embody transparency, quality, and sustainability, the design is thoroughly stripped of decoration and rendered in monochrome. Large product photography and ultra-bold hero titles focus attention on the clothing itself, while the UI recedes into the background as much as possible. - Density: A relaxed EC showcase style. Text overlaid on a large hero photo, with category navigation and a product