li {
  list-style: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
}
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.content-center {
  width: 1180px;
  margin: 0 auto;
}
@media screen and (max-width: 1055px) {
  .content-center {
    width: 98%;
    margin: 0 1%;
  }
}
.electronic-title {
  background: #f7f8f9;
  padding: 45px 0;
  width: 100%;
  line-height: 45px;
}
.electronic-title h1 {
  color: #44a8f2;
  font-weight: 300;
  font-size: 35px;
  line-height: 40px;
  font-weight: lighter;
}
.electronic-title a {
  color: #000;
}
.manual-content {
  padding-top: 30px;
  padding-bottom: 10px;
}
.manual-content>ul{
	margin: 0 -1%;
}
.manual-content>ul:after{
	content: '';
	display: block;
	clear: both;
}
.manual-content h2 {
  font-size: 20px;
  line-height: 50px;
  font-weight: lighter;
}
.manual-content li {
  position: relative;
  text-align: center;
  width: 16.5%;
  padding: 0 1%;
  float: left;
  margin-top: 10px;
  margin-bottom: 20px;
  box-sizing: border-box;
}
.manual-content li div{
    border: 1px #f2f2f2 solid;
    background: #f7f8f9;
    padding-top: 60px;
    box-sizing: border-box;
}
@media screen and (max-width: 1055px) {
  .manual-content li {
    width: 50%;
  }
}
.manual-content li img {
  width: 60%;
  padding: 20px 0;
  animation: img-translateY-back 1s;
  -webkit-animation: img-translateY-back 1s;
  animation-fill-mode: forwards;
  -webkit-animation-fill-mode: forwards;
}
.manual-content li .pdf-icon {
  display: block;
  background: url("../images/shuomignshu-down.png") no-repeat center, #afafaf;
  width: 100%;
  height: 28px;
  opacity: 0.8;
  width: 50%;
  float: right;
  transition: all 600ms;
}
.manual-content li .world-icon {
  display: block;
  background: url("../images/shuomignshu-world.png") no-repeat center, #afafaf;
  background-size: 16px 16px ;
  width: 50%;
  height: 28px;
  opacity: 0.8;
  transition: all 600ms;
  border-right: 1px #f2f2f2 solid;
}
.manual-content li .pdf-icon:hover,
.manual-content li .world-icon:hover {
  background-color: rgba(0, 0, 0, 0.7);
  transition: all 600ms;
}
.manual-content li h2 {
  position: absolute;
  top: 20px;
  line-height: 30px;
  text-align: center;
  width: 100%;
}
.manual-content li a {
  text-decoration: none;
  color: #666;
}
.manual-content li:hover img,
.manual-content li:active img {
  animation: img-translateY 1s;
  -webkit-animation: img-translateY 1s;
  animation-fill-mode: forwards;
  -webkit-animation-fill-mode: forwards;
}
@keyframes img-translateY {
  0% {
    transform: translateY(0);
  }
  to {
    transform: translateY(-10px);
  }
}
@-webkit-keyframes img-translateY {
  0% {
    transform: translateY(0);
  }
  to {
    transform: translateY(-10px);
  }
}
@keyframes img-translateY-back {
  0% {
    transform: translateY(-10px);
  }
  to {
    transform: translateY(0);
  }
}
@-webkit-keyframes img-translateY-back {
  0% {
    transform: translateY(-10px);
  }
  to {
    transform: translateY(0);
  }
}
@keyframes airwheel-translate {
  0% {
    opacity: 0;
    transform: translate(-100px, 0);
  }
  to {
    opacity: 1;
    transform: translate(0, 0);
  }
}