* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #111;
    background: #fff;
    padding: 2rem;
  }
  
  a {
    color: #0073e6;
    text-decoration: none;
  }
  
  a:hover {
    text-decoration: underline;
  }
  
  .container {
    max-width: 800px;
    margin: 0 auto;
  }
  
  header {
    margin-bottom: 2rem;
    text-align: center;
  }
  
  h1 {
    font-size: 2rem;
    margin-bottom: 0.25rem;
  }
  
  h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid #ccc;
    padding-bottom: 0.25rem;
  }
  
  h3 {
    font-size: 1.1rem;
    margin-top: 1rem;
    font-weight: 600;
  }
  
  p, ul {
    margin-bottom: 1rem;
  }
  
  ul {
    padding-left: 1.25rem;
  }
  
  ul ul {
    margin-top: 0.5rem;
  }
  
  @media (max-width: 600px) {
    body {
      padding: 1rem;
      font-size: 15px;
    }
  }