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

Design policy: Compose everything at right angles using only three colors: white, black, and red. The hero is a grid of 10 monochrome photo tiles of "a hand writing" overlaid with red shapes (the dot and bar of an exclamation mark), and the only element with saturation is red. No rounded corners, no shadows, no gradients - About Zebra: A writing instrument manufacturer whose corporate slogan is "Beyond writing, what comes next." The two-layer structure of each product brand having its own color while the corporate color is red is expressed directly as CSS variables - Density: Medium. Content w