:root { color-scheme: dark; }
* { box-sizing: border-box; }
body { margin:0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial; background:#0b0b0b; color:#eaeaea; }
header nav { display:flex; gap:12px; padding:12px 16px; border-bottom:1px solid #222; }
a { color:#7dd3fc; text-decoration:none; }
a:hover { text-decoration:underline; }
main { max-width: 840px; margin: 24px auto; padding: 0 16px; }
h1 { margin: 12px 0 8px; }
.btn { display:inline-block; background:#2563eb; color:#fff; padding:10px 14px; border-radius:10px; text-decoration:none; }
.error { color:#f87171; }
.ok { color:#4ade80; }
label { display:block; margin:8px 0; }
input, textarea, select { width:100%; padding:10px; background:#111; color:#eee; border:1px solid #333; border-radius:8px; }
fieldset { border:1px solid #222; border-radius:12px; padding:12px; margin:14px 0; }
.row { display:flex; gap:8px; margin:8px 0; }
.row > * { flex:1; }