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

Design policy: A clean, corporate design typical of a Japanese telecommunications carrier, using a white background with vivid blue #357eec as the accent color. Prioritizes trust and stability over flashiness - Density: Body line-height 1.5, body base 14px, with a generous amount of information. Large section headings stand boldly at 40px, giving the dense feel of a compactly packed corporate site - Keywords: Corporate blue, trust, system fonts, pill CTA, the solidity of a telecommunications carrier - Characteristics: - Unified with a system font stack. A Windows-first design that places Meiry