:root{--bg:#0b0b10;--fg:#e8e8ee;--accent:#8b5cf6}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,"Helvetica Neue",Arial}
main{max-width:820px;margin:8vh auto;padding:24px}
.card{background:#141420;border:1px solid #23233a;border-radius:16px;padding:28px;box-shadow:0 8px 30px rgba(0,0,0,.35)}
h1{margin:0 0 6px;font-weight:700;font-size:28px}
p{opacity:.9;margin:0 0 14px}
code{background:#1c1c2a;padding:.2em .4em;border-radius:6px}
a.btn{display:inline-block;margin-top:10px;padding:10px 16px;border-radius:10px;text-decoration:none;background:var(--accent);color:white}
small{opacity:.7}