body {
      font-family: Arial, sans-serif;
      max-width: 800px;
      margin: 40px auto;
      padding: 0 20px;
      line-height: 1.6;
    }

    h1, h2 {
      color: #333;
    }

    .section {
      margin-top: 30px;
    }

    ul {
      padding-left: 20px;
    }

    .contact span {
      display: inline-block;
      margin-right: 15px;
    }

    .lang-toggle {
      text-align: right;
    }

    .lang-toggle button {
      margin: 10px;
      padding: 5px 10px;
      font-size: 0.9em;
    }

    .cn, .en {
      display: none;
    }

    .show {
      display: block;
    }

    .red{
        color: red;
    }

    .section {
        margin-top: 30px;
        padding: 15px;
        border-left: 4px solid #00bcd4;
        background: #fafafa;
    }

    body.dark {
        background: #121212;
        color: #eee;
    }

    body.dark h1, 
    body.dark h2 {
        color: #fff;
    }

    body.dark .section {
        background: #1e1e1e;
        border-left: 4px solid #4dd0e1;
    }

    body.dark a {
        color: #4dd0e1;
    }