body { font-family: system-ui, sans-serif; background:#0b1220; color:#e8eef9; }
.card { max-width:720px; margin:10vh auto; background:#111a2b; padding:24px; border-radius:16px; }
label { display:block; margin:12px 0; }
input { padding:8px; width:100%; }
button { padding:10px 16px; margin-right:8px; }
pre { background:#0a0f1a; padding:12px; border-radius:8px; max-height:40vh; overflow:auto; }