*, *:before, *:after {
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
  }
  
  body, div, dl, dt, dd, ul, ol, li, h1, h2, h3,
  h4, h5, h6, form, fieldset, legend,
  input, textarea, p, blockquote, th, td {
    margin: 0;
    padding: 0;
  }
  
  table {
    border-collapse: collapse;
    border-spacing: 0;
  }
  
  fieldset, img {
    border: 0;
  }
  
  li {
    list-style: none;
  }
  
  caption, th {
    text-align: left;
  }
  
  q:before,
  q:after {
    content: "";
  }
  
  input:password {
    ime-mode: disabled;
  }
  
  /* A11Y：移除了 outline 样式，注意设置其他 :focus 样式，方便残障人士识别焦点 */
  *:focus {
    outline: none;
  }

  body {
    -webkit-user-select: none;
    user-select: none;
  }
  
  a,
  img {
    -webkit-touch-callout: none;
  }
  
  body {
    background-color: #f5f5f9;
  }
  
  body, input, textarea, select, button {
    font-size: 16px;
    line-height: 1.5;
    color: #333;
    font-family: "Helvetica Neue", Helvetica, STHeiTi, sans-serif;
  }
  
  input {
    line-height: normal;
  }
  
  a {
    color: #0af;
    text-decoration: none;
  }
  
  .fn-clear:after {
    content: "\0200";
    visibility: hidden;
    display: block;
    font-size: 0;
    clear: both;
    height: 0;
  }
  
  .fn-hide {
    display: none;
  }
  
  .fn-left {
    float: left;
  }
  
  .fn-right {
    float: right;
  }
  
  .am-content {
    margin-left: 16px;
    margin-right: 16px;
  }
  
  .am-fixed {
    position: fixed !important;
    top: 0;
    left: 0;
    right: 0;
    z-index: 99;
    width: 100%;
  }
  
  .am-fixed-bottom {
    top: inherit;
    bottom: 0;
  }
  
  .user-select {
    -webkit-user-select: auto;
    user-select: auto;
  }