:root{--bg:#f7f7f9;--accent:#0366d6;--text:#111}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
.center{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
h1{color:var(--accent);font-size:2.5rem;margin:0}
p{opacity:0.85}