body {
  font-family: Arial, sans-serif;
  padding: 20px;
  background: #f6f6f6;
  color: #333;
}

input, select, button {
  margin: 5px;
  padding: 8px;
  font-size: 1em;
}

button {
  background: #007bff;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}

.hidden {
  display: none;
}

.error {
  color: red;
  margin-top: 5px;
}

.device-log {
  background: #111;
  color: #0f0;
  font-family: monospace;
  padding: 10px;
  height: 150px;
  overflow-y: auto;
  margin-top: 5px;
  border-radius: 4px;
  white-space: pre-wrap;
}