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

Design approach: A soft, modern corporate design incorporating neumorphism. Soft shadows and rounded cards create a warm corporate image - Density: Generous whitespace. The hero area is a full-width visual, and content uses a large card layout - Keywords: Neumorphic, soft, corporate, clean, trustworthy - Characteristics: Uses a light gray of #f3f5f7 rather than pure white as the background, and gives cards and buttons a three-dimensional feel with neumorphic (convex/concave) shadows