/* 移动端优化 */
  @media screen and (max-width: 768px) {
    h1 { font-size: 28px !important; }
    h2 { font-size: 22px !important; }
    p, li { font-size: 14px !important; }
    img { width: 100% !important; height: auto !important; }
    a { padding: 12px 25px !important; font-size: 15px !important; }
  }