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

Design approach: A clean corporate site based on white. The brand color deep crimson #b70031 is used consistently for the logo, CTAs, and links, expressing the dignity and trustworthiness of a long-established stationery manufacturer. English section headings ("NEWS", "BRAND") are placed large with weight 300 + wide letter-spacing, creating an editorial impression - Density: Body text line-height is a somewhat generous 1.68. letter-spacing: 1px is specified across the entire body to ensure Japanese readability. Section headings are spaced even wider at letter-spacing: 4px - Keywords: Deep crim