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

Design policy: A product comparison media that balances trustworthiness and immediacy toward purchase, using a clean, white-based information design combined with green #0eb03a EC purchase buttons and warm gold #fbe8b4 "Thorough Comparison" badges - Density: Article pages use a body text of 14px / lh 1.62, a somewhat tight information density. Headings are set with palt for tight typesetting. The ranking list is a data-driven composition where product cards and three EC buttons (Amazon / Rakuten / Yahoo) are densely arranged - Keywords: system fonts, information density, EC green, gold badge,