body {
  font-family: system-ui, sans-serif;
  background: #0f172a;
  color: #e5e7eb;
  padding: 20px;
}
button {
  padding: 12px 18px;
  font-size: 16px;
  margin-right: 10px;
  background: #2563eb;
  color: white;
  border: none;
  border-radius: 6px;
}
.hidden { display: none; }
#status { margin-top: 15px; font-weight: bold; }
#deviceInfo {
  margin-top: 20px;
  background: #020617;
  padding: 15px;
  border-radius: 8px;
}