body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 2rem auto;
    max-width: 900px;
    padding: 0 1rem;
  }
  h1, h2, h3 {
    color: #2c3e50;
  }
  pre {
    background: #f4f4f4;
    padding: 1rem;
    overflow-x: auto;
    border-left: 4px solid #3498db;
  }
  code {
    background: #eee;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
  }
  ul {
    margin-left: 1.5rem;
  }
  .tip {
    background: #e8f5e9;
    border-left: 4px solid #4caf50;
    padding: 1rem;
    margin: 1rem 0;
  }
  .warning {
    background: #fff3e0;
    border-left: 4px solid #ff9800;
    padding: 1rem;
    margin: 1rem 0;
  }