Oisix ra daichi Style Design System (DESIGN.md, Japanese UI)

Design policy: A corporate site themed around food and agriculture, combining a sense of trust with warmth. Mincho headings lend editorial dignity, while the olive green brand color expresses the reassurance of nature and food - Density: Generous whitespace. Large hero sections, editorial-style layout - Keywords: nature, trust, dignity, editorial, olive green - Characteristics: Three different font families are used separately by role. Headings use Ryumin Mincho, body text uses Hiragino Kaku Gothic, and English display text uses Century Schoolbook. Buttons use a sharp style with no rounded cor