body {
  background-color: #f3f4f6;
  font-family: Arial, sans-serif;
  color: #111827;
  font-size: 16px;
  margin: 2em auto;
  max-width: 800px;
  padding: 1em;
  line-height: 1.4;
}

a {
  color: #2563eb;
}
a:visited {
  color: #991b1b;
}

p {
  line-height: 1.5em;
  margin-bottom: 1rem;
}

h1 {
  line-height: 1.8em;
}

.icon {
  vertical-align: sub;
  width: 1.2em;
  margin-right: 6px;
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: #111827;
    color: #fefefe;
  }
  a {
    color: #60a5fb;
  }
  a:visited {
    color: #ef4444;
  }
  .icon-github {
    fill: #ffffff;
  }
}