9h (nine hours) Style Design System (DESIGN.md, Japanese UI)

Design policy: Compose with achromatic colors only; use color only for "caution." Surfaces are only black (#000000), white (#ffffff), and 10 shades of gray. The only colors with saturation are --key (red #e93a28) and --yellow (#fdd22b), and both appear only in section labels and attention-grabbing elements. All the color on screen comes from the photos of guest rooms and amenities - About 9h: Since it's a capsule hotel, the brand's core isn't "staying" but the decomposition of time into "1h + 7h + 1h." The site reflects this exactly: the hero is a photo on a black background, and below it info