body,h3,p{
  margin: 0;
  padding: 0;
}
html ,body{height: 100%}
/* 最外层容器样式*/
.photo_wall {
  width: 100%;
  height: 100%;
  background: url(../img/bg.jpg) no-repeat center center;
  background-size: cover;
  position: relative;
  overflow: hidden;
}
/*照片容器样式*/
.photo{
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 1;
  opacity: 0;
  transition: 800ms;
}
/*每一张照片样式*/
.photo .photo_i,.photo .photo_3d,.photo .photo_side {
  width: 336px;
  height: 396px;
  position: absolute;
  left: 0;
  top: 0;
}
.photo .photo_i {
  transition: 800ms;
  perspective: 750px;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%) scale(.5) rotate(0deg);
}
.photo .photo_3d{
  transform-style: preserve-3d;
  transition: 500ms;
  transform-origin: 0 50%;
}
.photo .photo_side {
  background: #fff;
  border-radius: 6px;
  padding: 26px 24px;
  box-sizing: border-box;
  backface-visibility: hidden;
}
/*照片正面样式*/
.photo .photo_front{
  transform: rotate(0deg);
}
.photo .photo_front p{
  width: 286px;
  height: 286px;
  border: 2px solid #d8536d;
  display: flex;
  justify-content: center;
  overflow: hidden;
}
.photo .photo_front p img{
  height: 100%;
}
.photo .photo_front h3{
  width: 166px;
  height: 44px;
  font: 16px/44px Arial;
  color: #fff;
  margin: 0 auto;
  background: #d8356d;
  border-radius: 0 0 5px 5px;
  text-align: center;
}
/*照片反面样式*/
.photo .photo_back{
  transform: rotateY(180deg);
}
.photo .photo_back p{
  color: #d8356d;;
  font: 14px/22px Arial;
}
/*照片正面对应的class*/
.photo .front .photo_3d{
  transform: rotateY(0deg) translateX();
}
/*照片反面对应的class*/
.photo .back .photo_3d{
  transform: translateX(100%) rotateY(-180deg);
}
/* 让照片居中的样式*/
.photo .center{
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%) scale(1) rotate(0deg);
  z-index: 9999;
}

/*导航区域样式*/
.nav{
  width: 100%;
  height: 190px;
  padding-top: 10px;
  position: absolute;
  left: 0;
  top: 0;
  z-index:8888;
  background: -webkit-linear-gradient(top,rgba(0,0,0,
    0.5),transparent);
    text-align: center;
}
@font-face {
  font-family: "maiduo";
  src: url(../font/iconfont.woff) format('woff');
}
.nav .nav_i{
  width: 30px;
  height: 30px;
  display: inline-block;
  background-color: rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  cursor: pointer;
  transform: scale(.5);
  font-family: "maiduo";
  line-height: 30px;
  color: rgba(255, 255, 255, 0);
  text-align: center;
  transition: 500ms;
}

.nav .active{
  color: rgba(255, 255, 255, 1);
  transform: scale(.9) rotateY(0deg);
}
.nav .back{
  transform: scale(.8) rotateY(-180deg);
}
.photo_wall .shade{
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  background: rgba(255, 255, 255, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
}
.photo_wall .hide{
  transition: 800ms;
  transform: scale(0) rotateY(360deg);
  opacity: 0;
}
.photo_wall .shade .start{
  width: 200px;
  height: 50px;
  border: 2px solid #d8356d;
  border-radius: 10px;
  background: rgba(255, 190, 255, 0.3);
  text-align: center;
  font: 22px/50px Arial;
  cursor: pointer;
}