header{
    position: fixed !important;
    width: 100%;
    z-index: 10;
}
footer{
    position: absolute !important; 
    top: 400%;
    width: 100%;
}
 .spread{
    height: 100%;
} 
.scroll{
    position: fixed;
    right: 5px;
    top: 3%;
    width: 6px;
    height: 95%;
    background-color:rgba(0,0,0,.3);
    border-radius: 3px 3px;
    z-index: 10;
}
.thumb{
    position: relative;
    width: 100%;
    height: 20%;
    top: 0%;
    background-color: rgba(255,255,255,.5);
    border-radius: 3px 3px;
    transition: top .5s;
}

.bg1{
    background: url(../images/world/bg1.png) no-repeat;
}
.bg2{
    top: 100%;
    background: url(../images/world/bg2.jpg) no-repeat;
}
.bg3{
    top: 200%;
    background: url(../images/world/bg3.jpg) no-repeat;
}
.bg4{
    top: 300%;
    background: url(../images/world/bg4.jpg) no-repeat;

}
.bg{
    position: absolute;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;    
    transform-origin: center;
}
.bg .content{
    position: absolute;
    width: 100%;
    height: 20%;
    top: 30%; 
    z-index: 9;
}
.content .title{
    position: relative;
    width: 30%;
    height: 100%;
    left: 3%;
    background: url(../images/world/tiwate.png) no-repeat;
    background-size: 67%;
    margin: 0 auto;
}
.title img{
    position: absolute;
    top: 62%;
    left: -16%;
    width: 100%;
}
.content p{
    height: 100%;
    width: 38%;
    font-size: 16px;
    color: #fff;
    text-align: center;
    margin: 0 auto;
    line-height: 2em;
}
.ico {
    position: relative;
    width: 4%;
    height: 40%;
    top: 70%;
    left: -2%;
    margin: 0 auto;
    cursor: pointer;
}
.img1{
    position: absolute;
    width: 100%;
    height: 100%;
    background: url(../images/world/ico1-2.png) no-repeat;
    background-size: 100%;
    
}
.img2{
    position: absolute;
    width: 46%;
    height: 24%;
    top: 52%;
    left: 28%;
    background: url(../images/world/ico1-1.png) no-repeat;
    background-size: 100%;
    animation: i2 2s ease-in-out infinite alternate;
}
@keyframes i2{
  0%{
    transform: translateY(0%);
  }
  100%{
    transform: translateY(61%);
  }
}
 .img3{
    position: absolute;
    width: 100%;
    height: 100%;
    top:0%;
    left: 0%;
    background: url(../images/world/ico1.png) no-repeat;
    background-size: 100%;
    animation: i3 1s ease-in-out infinite;
} 
@keyframes i3{
    0%{
        transform: scale(1);
        opacity: 1;
    }
    100%{
        transform: scale(1.7);
        opacity: .5;
    }
}
.part{
 position: relative;
 width: 100%;
 height: 20%;
 top: 20%;
}
.mengde_title{   
    background: url(../images/world/mengde.png) no-repeat;  
}
.liyue_title{   
    background: url(../images/world/liyue.png) no-repeat;  
}
.daoqi_title{   
    background: url(../images/world/daoqi.png) no-repeat;  
}
.mengde_title,.liyue_title,.daoqi_title{
    position: relative;
    width: 6%;
    height: 65%;
    left: -2%;
    background-size: 100%;
    margin: 0 auto;   
}

.part h1{
    position: absolute;
    width: 100%;
    top: 95%;
    left: 10%;
    font-size: 5vh;
    color: #fff;
    font-weight: 400;
}
.part h1::before{
    position: absolute;
    content: '';
    left: -360%;
    top: 45%;
    width: 335%;
    height: 20%;
    background: url(../images/world/title-decro.png)no-repeat;
    background-size: 100%;
}
.part h1::after{
    position: absolute;
    content: '';
    left: 107%;
    top: 45%;
    width: 335%;
    height: 20%;
    background: url(../images/world/title-decro.png)no-repeat;
    background-size: 100%;
    transform: rotateY(180deg);
}
.part p{
    position: relative;
    width: 47%;
    height: 100%;
    top: 60%;
    left: -2%;
    font-size: 16px;
    text-align: center;
    margin: 0 auto;
    color: #fff;
    line-height: 2em;
}
.part_ico{
    position: relative;
    width: 8%;
    height: 100%;
    top: 80%;
    background: url(../images/world/mengde-ico.png) no-repeat ;
    margin: 0 auto;
    background-size: 45%;
}
.part_img{
    position: absolute;
    width: 44%;
    height: 36%;
    top: 0;
    left: 0;
    background: url(../images/world/part-ico.png) no-repeat;
    background-size: 100%;
    animation: part_img .8s linear infinite;
    cursor: pointer;
}
.part_ico span{
    position: absolute;
    top: 45%;
    font-size: 16px;
    color: #fff;
}
@keyframes part_img{
    0%{
        transform: scale(1);
        opacity: 1;
    }
    100%{
        transform: scale(1.9);
        opacity: .2;
    }
}
/* 点击内容 */
article .mengde,.liyue,.daoqi{
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,.7);
    z-index: 100;
}
article .mengde{
    top: 100%;
}
article .liyue{
    top: 200%;    
}
article .daoqi{
    top: 300%    
}
.mengde .box,.liyue .box,.daoqi .box {
    position: relative;
     overflow: hidden; 
    height: 75%;
    width: 730px;
    top: 10%;
    margin: 0 auto;
}

.box ul li p{
    font-size: 15px;
    color: #fff;
    line-height: 2em;
   padding: 20px 0;
}
.box h2{
    position: relative;
    padding: 10px 0;
    font-size: 28px;
    color: #fff;
    font-weight: 400;
    border-bottom:3px solid rgba(255,255,255,.3) ;
}
.box h2::before{
    position: absolute;
    content: '';
    width: 80px;
    height: 3px;
    top: 62px;
    left: 0;
    background-color: #cca574;
}

.box img{
 width: 640px;   
}
.box ul{
    position: relative;
    transition: top ;
    top: 0%;
}
.box ul li{
    width: 640px;
    margin-bottom: 30px;
}
.top{
    position: relative;
    top: 13%;
    left: 0%;
    width: 730px;
    height: 100px;
    margin:  0 auto;
}
.top h1{
    height: 65px;
    width: 640px;   
    padding-left: 20px;
    font-weight: 400;
    line-height: 65px;
    font-size: 36px;
    color: #fff;
    background: url(../images/world/mengde-top.png) no-repeat rgba(255, 255, 255, .05);
    background-size: 127px;
}
.top button{
    position: absolute;
    top: 0px;
    right: 0px;
    height: 65px;
    width: 65px;
    background: url(../images/world/close.png) no-repeat rgba(255, 255, 255, .05) center;
    background-size: 25px;
}
.mengde .scroll_2,.liyue .scroll_2,.daoqi .scroll_2{
    position: absolute;
    right: 0%;
    top: 0%;
    width: 4px;
    height: 100%;
    background-color: rgba(255,255,255,.3);
    z-index: 100;
    border-radius: 2px;
    cursor: pointer;
}
.thumb_2{
    position: absolute;
    right: 0%;
    top: 0%;
    width: 4px;
    height: 20%;
    background-color: rgba(255,255,255,.7);
    z-index: 100;
    border-radius: 2px;
    transition: top;
}