:root{--bg:#f7f7fb;--text:#0f172a}#__next,body,html{height:100%}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial;color:var(--text);background:var(--bg)}.container{max-width:960px;margin:48px auto;padding:0 16px}h1{margin-bottom:24px}.calculator{box-sizing:border-box}