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

Design policy: A bold, open corporate site built around a multi-color brand identity. A "speak through whitespace" design with extremely large typography and generous whitespace. A different brand color is assigned to each section, creating visual rhythm - Density: Extremely relaxed. A magazine-like layout with large headings, wide whitespace, and a small amount of text - Keywords: Multi-color, bold typography, whitespace, magazine-like, entertainment - Characteristics: A two-tier structure combining Latin-script headings (Roc Grotesk) and Japanese subheadings (DNP Shuei Gothic Gin). Brand col