html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
  font-family: sans-serif;
  background-color: #fff;
  color: #000;
}

header {
  background-color: #333;
  color: white;
  padding: 1em;
}

main {
  flex: 1;
  padding: 2em;
  background-color: #f9f9f9;
}

/* 🌙 Dark mode styles */
@media (prefers-color-scheme: dark) {
  html,
  body {
    background-color: #121212;
    color: #e0e0e0;
  }

  a {
    color: lightgreen;
  }

  header {
    background-color: #1f1f1f;
    color: #e0e0e0;
  }

  main {
    background-color: #1a1a1a;
  }

  footer {
    background-color: #1f1f1f;
    color: #aaa;
  }
}