html, body {
      font-family: 'PingFang TC', 'Microsoft JhengHei', Arial, sans-serif;
      background: #fafdff;
      margin: 0; padding: 0;
      color: #274552;
      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;
      box-shadow: 0 3px 32px -13px #6ed1b933;
      border-radius: 14px;
    }
    h1, h2, h3, h4, h5 {
      margin-top: 1.5em;
      margin-bottom: 0.5em;
      font-family: inherit;
    }
    h1 { font-size: 2.2em; color: #179e96; font-weight: bold;}
    h2 { font-size: 1.5em; color: #5ad3c0;}
    h3, h4 { font-size: 1.2em;}
    a { color: #179e96; text-decoration: underline;}
    img {
      max-width: 100%;
      height: auto;
      border-radius: 16px;
      display: block;
      margin: 18px auto;
      box-shadow: 0 2px 14px -7px #c3e5eb55;
    }
    .toc {
      background: #e9f8fa;
      border-radius: 22px;
      padding: 18px 18px 8px 18px;
      margin: 18px 0;
    }
    .toc li { margin-bottom: 7px; }
    .highlight {
      background: #d3f0f4;
      border-radius: 18px;
      padding: 15px 16px 8px 16px;
      margin: 20px 0;
      border-left: 5px solid #38b4a7;
    }
    .dotted-box {
      border: 2.5px dotted #6ed1b9;
      border-radius: 20px;
      padding: 12px 16px;
      margin: 20px 0;
      background: #f3fcfc;
    }
    .faq-box {
      background: #f1fafc;
      border-radius: 16px;
      padding: 14px 18px;
      margin: 24px 0;
      border-left: 4px solid #38b4a7;
    }
    .callout {
      border-radius: 16px;
      padding: 11px 15px;
      border: 1.5px solid #38b4a7;
      margin: 24px 0;
      background: #e8f8f4;
    }
    .main-phone {
      font-size: 1.35em;
      color: #0d6c62;
      font-weight: bold;
      letter-spacing: 1px;
      display: block;
      margin: 10px 0 6px 0;
    }
    .keyword-box {
      border: 2.5px dotted #6ed1b9;
      background: #f3fcfc;
      border-radius: 18px;
      padding: 13px 18px;
      margin: 36px 0 0 0;
      color: #29767b;
      font-size: 1.07em;
      letter-spacing: 1px;
    }
    .keyword-box b {
      color: #179e96;
      font-weight: bold;
      font-size: 1.1em;
      margin-right: 8px;
    }
    .keyword-tag {
      display: inline-block;
      background: #d3f0f4;
      color: #179e96;
      border-radius: 12px;
      padding: 2px 13px;
      font-size: 0.99em;
      margin: 2px 8px 2px 0;
      border: 1px solid #6ed1b9;
    }
    .small-muted {
      color: #89aab6;
      font-size: 0.97em;
    }
    @media (max-width:600px) {
      .container {padding: 10px 2vw;}
      h1 { font-size: 1.3em;}
      h2 { font-size: 1.08em;}
      .toc {padding: 12px;}
      .dotted-box, .highlight, .faq-box, .callout, .keyword-box {padding: 10px;}
      .keyword-tag {padding: 2px 8px; font-size: 0.95em;}
    }