body{font-family:system-ui,-apple-system,Segoe UI,Roboto,'Helvetica Neue',Arial; margin:0;color:#111}
.center{max-width:720px;margin:8vh auto;padding:2rem;text-align:center}
h1{font-size:2.2rem;margin-bottom:.5rem}
p{line-height:1.5;color:#222}
.muted{color:#666;font-size:.95rem}
code{background:#f3f4f6;padding:.15rem .4rem;border-radius:4px}