:root{--bg:#0f1220;--fg:#e8ecf5;--card:#ffffff12;--stroke:#ffffff26}
*{box-sizing:border-box} html,body{height:100%}
body{margin:0;display:grid;place-items:center;background:linear-gradient(180deg,#0f1220,#151c34);color:var(--fg);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Arial}
.box{width:min(720px,92vw);padding:24px;border-radius:16px;border:1px solid var(--stroke);background:linear-gradient(180deg,var(--card),transparent 120%);text-align:center}
h1{margin:0 0 8px}
code{background:#00000030;padding:2px 6px;border-radius:6px}
a{color:#9ecbff;text-decoration:none} a:hover{text-decoration:underline}