:root {
  color-scheme: light dark;
  font-family: system-ui, sans-serif;
}

body {
  max-width: 40rem;
  margin: 3rem auto;
  padding: 0 1rem;
  line-height: 1.5;
}

form {
  display: flex;
  gap: 0.5rem;
  margin: 1.5rem 0;
}

input[type='text'] {
  flex: 1;
  padding: 0.5rem;
  font-size: 1rem;
}

button {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
}

#result {
  margin-top: 1rem;
}

.success {
  color: #1a7f37;
}

.error {
  color: #cf222e;
}

.qrcode {
  display: block;
  margin-top: 1rem;
  width: 160px;
  height: 160px;
}