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

Design policy: White background, thin borders, small corner radii. Since food photography is the star, the UI is composed only of #e5e5e5 1px borders and 4px / 8px corner radii. The only elements with a filled surface are the black primary CTA and the pale purple indicating selection - About TableCheck: Provides restaurant reservations, waitlists, prepayment (TableCheck Pay), and "Fastpass" for skipping the wait. The central flow is search → listing → restaurant → reservation form, with high density of cards and chips - Density: High. Within 1120px there is a 3-column card grid, and within tha