html, body {
      font-family: 'PingFang TC', 'Microsoft JhengHei', Arial, sans-serif;
      background: #f7fafc;
      margin: 0;
      padding: 0;
      color: #233a52;
      font-size: 17px;
      line-height: 1.7;
    }
    .container {
      max-width: 780px;
      margin: 0 auto;
      background: #fff;
      box-sizing: border-box;
      padding: 30px 20px 60px 20px;
      border-radius: 18px;
      box-shadow: 0 2px 24px rgba(56,156,231,0.07);
      margin-top: 16px;
      margin-bottom: 28px;
    }
    h1, h2, h3 {
      margin-top: 1.5em;
      margin-bottom: 0.5em;
      font-family: inherit;
      font-weight: bold;
    }
    h1 { font-size: 2.1em; color: #2274b4;}
    h2 { font-size: 1.4em; color: #39a1db;}
    h3 { font-size: 1.1em; color: #2274b4;}
    a { color: #2274b4; text-decoration: underline;}
    .intro {
      background: #eaf4fd;
      border-radius: 18px;
      padding: 16px 20px 10px 20px;
      margin: 18px 0 32px 0;
      border-left: 5px solid #2274b4;
    }
    .discount-box {
      background: #e6fbe6;
      border-radius: 15px;
      border-left: 5px solid #39b77b;
      color: #186b37;
      padding: 14px 18px;
      margin-bottom: 26px;
      font-size: 1.08em;
    }
    .volunteer-form {
      background: #f3fafd;
      border-radius: 12px;
      padding: 20px 16px 16px 16px;
      margin-bottom: 20px;
      border-left: 4px solid #39a1db;
    }
    .volunteer-form label {
      display: block;
      margin-top: 10px;
      font-weight: bold;
      color: #174c6b;
    }
    .volunteer-form input,
    .volunteer-form textarea,
    .volunteer-form select {
      width: 100%;
      padding: 9px 7px;
      margin-top: 4px;
      border: 1px solid #b5d3e8;
      border-radius: 8px;
      font-size: 1em;
      box-sizing: border-box;
      background: #fff;
      margin-bottom: 8px;
    }
    .volunteer-form button {
      background: #2274b4;
      color: #fff;
      border: none;
      border-radius: 8px;
      padding: 11px 28px;
      font-size: 1.08em;
      margin-top: 18px;
      cursor: pointer;
      transition: background 0.18s;
    }
    .volunteer-form button:hover {
      background: #39a1db;
    }
    .note {
      font-size: 0.99em;
      color: #2274b4;
      margin-top: 14px;
      margin-bottom: 20px;
    }
    .success-message {
      background: #eafbe7;
      border: 1.5px solid #94d7b6;
      color: #206c3d;
      border-radius: 10px;
      padding: 13px 18px;
      margin-top: 16px;
      font-size: 1.07em;
      display: none;
    }
    .faq-box {
      background: #f6fafd;
      border-radius: 16px;
      padding: 16px 18px;
      margin: 32px 0 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;}
      .intro, .volunteer-form, .faq-box, .keyword-box, .discount-box {padding: 10px;}
      .volunteer-form input, .volunteer-form textarea, .volunteer-form select {font-size: 0.98em;}
      .volunteer-form button {padding: 8px 12px; font-size: 1em;}
      .keyword-tag {padding: 2px 8px; font-size: 0.95em;}
    }