html, body {
      font-family: 'PingFang TC', 'Microsoft JhengHei', Arial, sans-serif;
      background: #fff;
      margin: 0; padding: 0;
      color: #233a52;
      font-size: 17px;
      line-height: 1.7;
    }
    .container {
      max-width: 750px;
      margin: 0 auto;
      background: #fff;
      box-sizing: border-box;
      padding: 22px 10px 50px 10px;
    }
    h1, h2, h3 {
      margin-top: 1.5em;
      margin-bottom: 0.5em;
      font-family: inherit;
    }
    h1 { font-size: 2.1em; color: #2274b4; font-weight: bold;}
    h2 { font-size: 1.4em; color: #39a1db;}
    h3 { font-size: 1.1em; color: #2274b4;}
    a { color: #2274b4; text-decoration: underline;}
    .highlight {
      background: #eaf4fd;
      border-radius: 18px;
      padding: 14px 16px 8px 16px;
      margin: 20px 0;
      border-left: 5px solid #2274b4;
    }
    .callout {
      border-radius: 16px;
      padding: 13px 18px;
      border: 1.5px solid #39a1db;
      margin: 24px 0;
      background: #f1f8fc;
    }
    .faq-box {
      background: #f6fafd;
      border-radius: 16px;
      padding: 14px 18px;
      margin: 24px 0;
      border-left: 4px solid #39a1db;
    }
    .keyword-box {
      border: 2.5px dotted #80c4ef;
      background: #f7fbff;
      border-radius: 18px;
      padding: 13px 18px;
      margin: 36px 0 0 0;
      color: #2870a8;
      font-size: 1.07em;
      letter-spacing: 1px;
    }
    .keyword-tag {
      display: inline-block;
      background: #eaf4fd;
      color: #2274b4;
      border-radius: 12px;
      padding: 2px 13px;
      font-size: 0.99em;
      margin: 2px 8px 2px 0;
      border: 1px solid #80c4ef;
    }
    @media (max-width:600px) {
      .container {padding: 10px 2vw;}
      h1 { font-size: 1.3em;}
      h2 { font-size: 1.08em;}
      .callout, .faq-box, .keyword-box, .highlight {padding: 10px;}
      .keyword-tag {padding: 2px 8px; font-size: 0.95em;}
    }