body.dark-mode {
  background-color: #121212;
  color: #f0f0f0;
  font-family: sans-serif;
  margin: 0;
  padding: 0;
}
header, footer {
  background-color: #1e1e1e;
  padding: 1rem;
  text-align: center;
}
a { color: #4fc3f7; }
.qr-section, .watchdog-alerts {
  padding: 1rem 2rem;
}
.qr-grid {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}
.qr-item {
  border: 1px solid #333;
  padding: 1rem;
  background-color: #1e1e1e;
}