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

Design Systems

Design policy: Clean, minimal, practical UI based on a white background - Density: The product listing grid has high information density, but ample whitespace is maintained - Keywords: Simple, trustworthy, whitespace, Mercari Red, functional

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

You are an expert web designer. Build a stunning, production-ready page with
a bold hero section, smooth CSS transitions and a carefully tuned dark palette.
Use a neutral background, generous rounded corners and one electric accent color.
Structure the layout with a sticky header, feature grid, social proof and a final
call to action. Keep typography tight, spacing consistent and motion subtle.

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