:root{--space-1: 4px;--space-2: 8px;--radius-1: 6px;--font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial}body{font-family:var(--font-sans)}.post-card{border:1px solid #ddd;padding:12px;border-radius:var(--radius-1);max-width:600px}