body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
    background: #f9fafb;
    color: #333;
  }

  h1 {
    text-align: center;
  }

  h1,
  h2 {
    color: #0078d4;
  }

  nav {
    margin-bottom: 20px;
  }

  nav a {
    margin-right: 15px;
    text-decoration: none;
    color: #0078d4;
  }

  nav a:hover {
    text-decoration: underline;
  }

  nav a.active {
    font-weight: 700;
    color: #004a9f;
    text-decoration: underline;
  }

  .logo {
    height: 30px;
    display: inline-block;
    vertical-align: middle;
  }

  p, ul {
    line-height: 1.8;
    margin: 1em 0;
  }

  ul {
    margin-left: 20px;
  }

  code {
    background: #eee;
    padding: 2px 4px;
    border-radius: 4px;
  }

  .section {
    margin-bottom: 40px;
  }

  .footer {
    margin-top: 40px;
    font-size: 14px;
    color: #888;
  }