/* Light mode (default) */
body {
  background-color: #ffffff;
  color: #111111;
  transition: background-color 0.3s, color 0.3s;
}

/* Dark mode */
body.dark {
  background-color: #1a1a1a;
  color: #f0f0f0;
}

body.dark button {
  background-color: #333333;
  color: #f0f0f0;
  border: 1px solid #555555;
}