/* quick ======= */
.nav-bar {
  position: fixed;
  top: 12%;
  right: 0;
  width: 90px;
  min-width: 57px;
  max-width: 100px;
  -webkit-transition: all 0.6s;
  transition: all 0.6s;
  z-index: 99;
}
.nav-bar img {
  width: 100%;
}

#top_bn {
  position: relative;
  height: 10vw;
  max-height: 80px;
  background-color: #47645a;
  text-align: center;
}
#top_bn > img {
  display: block;
  width: auto;
  height: 100%;
  margin: 0 auto;
}
#top_bn #top_bn_cls {
  position: absolute;
  top: 50%;
  right: 8%;
  width: 3%;
  padding: 8px;
  min-width: 30px;
  max-width: 45px;
  -webkit-transform: translate(0, -50%);
          transform: translate(0, -50%);
  cursor: pointer;
}
#top_bn #top_bn_cls img {
  width: 100%;
  height: auto;
}

@media all and (max-width: 1023px) {
  #top_bn #top_bn_cls {
    right: 5%;
    width: 20px;
    padding: 5px;
    min-width: 0px;
  }
}
.wechat_pop {
  position: fixed;
  left: 50%;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  z-index: 999;
  background: #222;
  opacity: 0;
  visibility: hidden;
  -webkit-transition: opacity 0.8s ease, -webkit-transform 0.8s ease;
  transition: opacity 0.8s ease, -webkit-transform 0.8s ease;
  transition: opacity 0.8s ease, transform 0.8s ease;
  transition: opacity 0.8s ease, transform 0.8s ease, -webkit-transform 0.8s ease;
}
.wechat_pop img {
  width: 100%;
}
.wechat_pop.active {
  opacity: 1;
  visibility: visible;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  pointer-events: auto;
}

#mask {
  position: fixed;
  display: none;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 998;
}

.close_btn {
  position: absolute;
  top: -12%;
  right: 43%;
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 50px;
}

@media screen and (max-width: 720px) {
  .close_btn {
    font-size: 6.5vw;
    right: 41%;
  }
}