body {
    background: #fde7bd;
}

.t-box {
    padding: 0.5rem;
}

.t-box .t-tit {
    margin-bottom: 0.3rem;
}

.t-box .t-txt {
    overflow: hidden;
    min-height: 9.5rem;
    position: relative;
}

.b-box-a,
.b-box-b,
.b-box-c,
.b-box-d {
    background: url(../images/bga.jpg) no-repeat center;
    background-size: cover;
}

.b-box-b {
    background-image: url(../images/bgb.jpg);
}

.b-box-c {
    background-image: url(../images/bgc.jpg);
}

.b-box-d {
    background-image: url(../images/bgd.jpg);
}

.box-b .img,
.box-d .img {
    position: absolute;
    top: 0;
    left: 0;
    width: 42%;
}

.box-c .img {
    position: absolute;
    top: 0;
    right: 0;
    width: 42%;
}

.box-b .t-item,
.box-d .t-item {
    float: right;
}

.box-b .t-item:nth-child(1),
.box-c .t-item:nth-child(2n+1),
.box-d .t-item:nth-child(1) {
    margin-right: 0;
}

.box-c .t-item:nth-child(2n+0) {
    margin-right: 2%;
}

.box-b .t-item:nth-child(2),
.box-c .t-item:nth-child(2),
.box-d .t-item:nth-child(2) {
    clear: both;
}

.box-f {
    margin-bottom: 3.4rem;
}


/* 导航 */

.nav-box {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    padding: 0.2rem;
    background-color: rgba(0, 0, 0, .8);
    overflow: hidden;
}

.nav-box .nav-ul a {
    display: block;
    float: left;
    width: 33%;
    line-height: 1.5rem;
    text-align: center;
    box-sizing: border-box;
    font-size: 0.55rem;
    color: #fff;
}

.nav-box .nav-ul a.on {
    background-color: #aeacce;
    color: #aafeff;
    border-radius: 0.75rem;
}

.nav-box .nav-ul a:last-child {
    margin-right: 0;
}

.scroll {
    position: fixed;
    bottom: 3.5rem;
    right: 0.43rem;
    z-index: 1000;
    display: inline-block;
    width: 1.5rem;
    height: 1.5rem;
    line-height: 1.5rem;
    text-align: center;
    border-radius: 100%;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
}

.nav-box,
.scroll {
    z-index: 10;
}