:root{--max-width:720px;--font-body:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden}body{font-family:var(--font-body);line-height:1.6;color:#111;background:#fff}main{max-width:var(--max-width);margin:0 auto;padding:24px 16px}