html {
  height: 100%;
}
body {
  font-family: '微软雅黑', Arial, Helvetica, sans-serif;
  color: #000000;
  -webkit-backface-visibility: hidden;
  background: #ffffff;
  height: 100%;
}
.clear:after {
  content: '';
  display: block;
  height: 0;
  clear: both;
}
.hide {
  display: none;
}
.show {
  display: block;
}
.invisible {
  visibility: hidden;
}
a {
  color: inherit;
  cursor: pointer;
}
.popup {
  height: 100%;
  width: 100%;
  position: fixed;
  top: 0;
  left: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 100;
}
.popup .popup_card {
  position: relative;
  background-color: #fff;
  color: #323232;
  width: 16.325rem;
  height: auto;
  border-radius: 0.25rem;
  margin: 2.5rem auto;
  box-shadow: 0 -4px 10px #775c5a;
  padding: 0.5rem;
}
.popup .popup_card .popup_close {
  height: 1rem;
  width: 1rem;
  cursor: pointer;
  background-color: #000000;
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: url("i/i-close.png") no-repeat center;
  background-size: 100%;
}
@media screen and (max-width: 750px) {
  html {
    font-size: 40px;
  }
}
@media screen and (max-width: 640px) {
  html {
    font-size: 34px;
  }
}
@media screen and (max-width: 414px) {
  html {
    font-size: 22px;
  }
}
@media screen and (max-width: 393px) {
  html {
    font-size: 20.96px;
  }
}
@media screen and (max-width: 384px) {
  html {
    font-size: 20.48px;
  }
}
@media screen and (max-width: 375px) {
  html {
    font-size: 20px;
  }
}
@media screen and (max-width: 360px) {
  html {
    font-size: 19.2px;
  }
}
@media screen and (max-width: 320px) {
  html {
    font-size: 17px;
  }
}