:root{--bg:#f8fafc;--fg:#0f172a;--accent:#0066cc}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,'Helvetica Neue',Arial;line-height:1.5;color:var(--fg);background:var(--bg);display:flex;min-height:100vh;align-items:center;justify-content:center;margin:0}
main{max-width:720px;padding:2rem;background:#fff;border-radius:10px;box-shadow:0 6px 20px rgba(16,24,40,.08)}
h1{color:var(--accent);margin-top:0}
footer{position:fixed;left:1rem;bottom:1rem;color:#6b7280;font-size:.85rem}