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

Design approach: Dark & immersive. A "theatrical" layout in which a black background makes colorful product photography stand out. The contrast between a playful handwritten-style display font and an inorganic dark UI is what creates the LUSH feel. - Density: Full-bleed, large visual sections. Product images are the star; text is kept to a minimum. - Keywords: theatrical, playful, immersive, dark, colorful - Characteristics: A unique design token system in which product names (Rose Jam, Sleepy, Twilight, etc.) are used directly as CSS variable names. Pure #000000 is used for the page backgroun