JAL (Japan Airlines) Style Design System (DESIGN.md, Japanese UI)

Design philosophy: A black header paired with JAL Red #cc0000 pill CTAs, conveying the trust and dignity befitting an airline brand. The page background uses light gray #f4f5f6 to organize the information-dense reservation UI - Density: A high-density composition of reservation forms, promo cards, and notices. Line-height 1.5 ensures readability while keeping things compact - Keywords: JAL Red, black header, pill CTA, airline brand trust, unified Noto Sans JP - Characteristics: - The header is fully black #000000, making white text and red CTA buttons stand out - The brand color is #cc0000 (JA