:root{--page:#f6f6f6;--ink:#1a1a1a}*{box-sizing:border-box}body{background:var(--page);color:var(--ink);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.shell{max-width:720px;margin:0 auto;padding:48px 16px}
