body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  color: #333;
}
h1, h2, h3 {
  color: #2c3e50;
}
h1 {
  border-bottom: 2px solid #3498db;
  padding-bottom: 10px;
}
h2 {
  margin-top: 2em;
}
h3 {
  color: #34495e;
}
code {
  background: #f4f4f4;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
}
pre {
  background: #f4f4f4;
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
}
pre code {
  padding: 0;
  background: none;
}
a {
  color: #3498db;
}
hr {
  border: none;
  border-top: 1px solid #eee;
  margin: 2em 0;
}
ul, ol {
  padding-left: 1.5em;
}
li {
  margin: 0.5em 0;
}
strong {
  color: #2c3e50;
}
@media (prefers-color-scheme: dark) {
  body {
    background: #1a1a2e;
    color: #eee;
  }
  h1, h2, h3, strong {
    color: #eee;
  }
  h1 {
    border-bottom-color: #3498db;
  }
  code, pre {
    background: #16213e;
  }
  hr {
    border-top-color: #333;
  }
}