.list {
  padding: 0;
}

.list h2,
.list h3 {
  font-weight: bold;
}

.list li {
  width: calc(25% - 0.75em);
  float: left;
  margin-right: 1em;
  margin-bottom: 1em;
  position: relative;
}

.list li .cont {
  display: block;
  height: 100%;
  width: 100%;
  text-align: center;
  position: relative;
  z-index: 2;
  left: 0;
  top: 0;
}

.list li .cont div {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  display: none;
  z-index: 2;
}

.list li .cont div.box-ratio {
  display: block;
  position: relative;
  top: 0%;
  transform: translateY(0%);
  width: 100%;
  transition: opacity 0.3s;
  opacity: 1;
}

.list li .cont:hover div.box-ratio {
  opacity: 0.2;
}

.list li .cont h3 {
  /* font-size: 12px; */
}

.list li:hover .cont div {
  display: block;
}

.list li:nth-child(4n) {
  margin-right: 0em;
}

.list {
  overflow: hidden;
}
.content {
  margin-bottom: 3em;
}

.st {
  height: 70px;
  text-align: right;
  padding-bottom: 12px;
  /* margin-bottom: 12px; */
  margin-top: -32px;
}

.st .btn {
  /* font-weight: 100; */
}

.fx.st {
  top: 116px;
  position: fixed;
  width: 100%;
  left: 0;
  z-index: 99;
  background: #fff;
}

.dropdown-menu > li > a {
  text-align: left;
}

.option {
  display: inline-block;
  vertical-align: middle;
  margin-right: 5px;
}

.st .btn {
  background: none;
  border: 0;
  color: #a3a3a3;
}

.st .btn:hover,
.st .btn:focus {
  color: #dd7c1c;
}

.st .dropdown-menu {
  border: 0;
  border-radius: 0;
  background: #fff;
  max-height: 320px;
  overflow: auto;
  overflow-x: hidden;
}

.st .dropdown-menu > li > a {
  padding: 10px 20px;
  color: #a3a3a3;
}

.st .dropdown-menu > li > a:focus,
.st .dropdown-menu > li > a:hover,
.st .dropdown-menu > li.on > a {
  background: #dd7c1c;
  color: #fff;
}

.footer.w a,
.footer.w {
  position: fixed;
  background: #fff;
}

/* 新增修改 2021-1-6 */
.fx.st .btn-group {
  font-size: 16px;
  width: 5em;
  text-align: center;
  padding: 0.5em 0;
  /* margin-right: 5em; */
  /* background: #dd7c1c; */
}
.fx.st .btn-group .option {
  margin-right: 0;
}
.fx.st .btn-group + .btn-group {
  margin-left: -0.157em;
}
.fx.st .btn-group:nth-child(2) {
  margin-right: 20em;
}
.fx.st .btn-group .btn .caret {
  position: absolute;
  top: 50%;
  margin-top: -4px;
  right: 4px;
}
.fx.st .btn-group .btn {
  /* padding: 5px 0.7em !important; */
  padding: 0;
  width: 100%;
  display: block;
  float: left;
}
@media only screen and (max-width: 1366px) {
  .fx.st .btn-group:nth-child(2) {
    /* margin-right: 24.5em; */
  }
}
@media only screen and (max-width: 1280px) {
  .fx.st .btn-group {
    font-size: 15px;
  }
  .fx.st .btn-group:nth-child(2) {
    /* margin-right: 24em; */
  }
}
/* 新增修改 2021-1-6 end */
@media only screen and (max-width: 1024px) {
  .fx.st .btn-group:nth-child(2) {
    margin-right: 0;
  }
  .list li {
    height: auto !important;
  }
  .list li .cont {
    position: relative;
    opacity: 1;
  }
  .list li .cont div {
    display: block;
    position: relative;
    transform: translateY(0);
    padding: 1em 0;
  }
  .list li,
  .list li:nth-child(4n) {
    width: calc(50% - 0.5em);
    float: left;
    margin-right: 1em;
    margin-bottom: 1em;
    position: relative;
  }
  .list li:nth-child(2n) {
    margin-right: 0em;
  }
  .st {
    margin-top: -12px;
  }
  .fx.st {
    top: 56px;
  }
}

@media only screen and (max-width: 768px) {
  .list li,
  .list li:nth-child(2n) {
    width: 100%;
    float: left;
    margin-right: 1em;
    margin-bottom: 1em;
    position: relative;
  }
  .list li:nth-child(1n) {
    margin-right: 0em;
  }
}