JRA Japan Racing Association Style Design System (DESIGN.md, Japanese UI)

Design policy: No ornamentation; build hierarchy using only grid, typography, whitespace, and a single rule line. Treat horse racing—a "sport of numbers and data"—with Swiss-style discipline - Density: High-information-density list type. The essence of a horse racing information site is listability; do not redesign in the direction of increasing whitespace, but solve for readability while preserving density - Keywords: Swiss, Grid-Driven, Rule-Only, Data-First, Restrained