:root{--background:#fff;--foreground:#0f172a}*{box-sizing:border-box}body{margin:0;background:var(--background);color:var(--foreground);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.page-shell{max-width:880px;margin:0 auto;padding:2rem 1rem}