.guarantee{
    background: url("../images/advantage-bg.png") no-repeat;
    background-size: cover;
    width: 100%;
    height: 550px;
    overflow: hidden;
    position: relative;
}
.item-title{
    text-align: center;
    margin: 20px 0;
}
.item-title.w{
    color: #ffffff;
}
.item-title p{
    margin-top: 10px;
}
.guarantee-content{
    width: 1150px;
    margin: 50px auto;
}
.guarantee-main li{
    margin-right: 100px;
    display: block;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: #66b699;
    float: left;
    position: relative;
    margin-top: 50px;
    transition-duration: 1s;
}
.guarantee-main li:nth-of-type(3){
    margin-right: 0;
    transition-duration: 1s;
}
.guarantee-main li img{
    display: block;
    width: 40%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    transition-duration: 1s;
}
.guarantee-main li p{
    opacity: 0;
    width: 49%;
    overflow: hidden;
    color: #fff;
    /* margin-top: 55%; */
    margin: 0 auto;
    margin-top: 50%;
    font-size: 14px;
    text-align: justify;
    transition-duration: 1s;
}
.guarantee-main li.on{
    width: 350px;
    height: 350px;
    margin-top: 0;
    background: #f99021;
    transition-duration: 1s;
}
.guarantee-main li.on img{
    display: block;
    width: 30%;
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    transition-duration: 1s;
}
.guarantee-main li.on p{
    opacity: 1;
    transition-duration: 1s;
}
.advantage{
    background: url("../images/guarantee-bg.png") no-repeat;
    background-size: cover;
    width: 100%;
    height: 720px;
    overflow: hidden;
}
.advantage-contents{
    width: 1200px;
    margin: 0 auto;
}
.advantage-item{
    width: 400px;
    float: left;
    height: 305px;
}
.advantage-item:nth-of-type(3n){
    margin-right: 0;
}
.advantage-item>div{
    width: 215px;
    height: 215px;
    background: rgba(255,255,255,.5);
    border-radius: 50%;
    overflow: hidden;
    margin: 20px auto;
}
.advantage-item>div>div{
    width: 180px;
    height: 180px;
    background: #fff;
    border-radius: 50%;
    margin-top: 17.5px;
    margin-left: 17.5px;
    position: relative;
}
.advantage-item>div>div img{
    display: block;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    top: 20%;
}
.advantage-item>div>div h2{
    text-align: center;
    display: block;
    width: 100%;
    position: absolute;
    bottom: 20px;
}
.advantage-item p{
    text-align: center;
    color: #fff;
    font-size: 18px;
}
.promise{
    background: url("../images/promise.png") no-repeat;
    background-size: cover;
    width: 100%;
    height: 550px;
    overflow: hidden;
    position: relative;
}
.promise-content{
    width: 1200px;
    margin: 0 auto;
    position: relative;

}
.promise-content img{
    width: 480px;
}
.promise-content p{
    position: absolute;
    display: block;
    font-size: 15px;
}
.promise-content p:nth-of-type(1){
    left: 470px;
    top: 45px;
}
.promise-content p:nth-of-type(2){
    left: 510px;
    top: 137px;
}
.promise-content p:nth-of-type(3){
    top: 239px;
    left: 500px;
}
.promise-content p:nth-of-type(4){
    left: 457px;
    top: 323px;
}
.promise-content p:nth-of-type(5){
    left: 383px;
    top: 378px;
}
.advantages{
    width: 1200px;
    margin:0 auto;
    overflow: hidden;
}
.advantage-nav{
    overflow: hidden;
    margin: 40px auto;
}
.advantage-nav li{
    width: 200px;
    margin: 0 50px;
    box-sizing: border-box;
    border: 1px solid #989898;
    text-align: center;
    height: 40px;
    font-size: 20px;
    line-height: 40px;
    float: left;
    border-radius: 3px;
}
.advantage-nav li.on{
    color: #fff;
    background: #c40000;
    border-color: #c40000;
}
.advantage-content-body{
    position: relative;
    height: 700px;
}
.advantage-content{
    opacity: 0;
    z-index: -1;
    transition-duration: 1s;
    position: absolute;
    top: 0;
}
.advantage-content.on{
    opacity: 1;
    transition-duration: 1s;
    z-index: 1;
}
.no1{
    width: 1200px;
    margin: 0 auto;
}
.no1-item{
    float: left;
    width: 390px;
    margin-right: 15px;
    position: relative;
}
.no1-item:nth-of-type(3n){
    margin-right: 0;
}
.no1-item img{
    width: 100%;
    height: 250px;
}
.no1-item h2{
    font-size: 26px;
    margin: 30px 0;
    text-align: center;
}
.no1-item p{
    display: block;
    position: absolute;
    opacity: 0;
    background: rgba(0,0,0,0.7);
    font-size: 26px;
    text-align: center;
    box-sizing: border-box;
    padding-top: 90px;
    transition-duration: 1s;
    top: 0;
    left: 0;
    width: 100%;
    height: 250px;
    color: #fff;
}
.no1-item:hover p{
    opacity: 1;
    transition-duration: 1s;
}
.no2{
    width: 1200px;
    margin: 0 auto;
    margin-top: 40px;
}
.no2-item{
    width: 230px;
    float: left;
    margin-right: 12.5px;
    position: relative;
}
.no2-item:nth-of-type(5){
    margin-right: 0;
}

.no2-item .no2-mask{
    width: 300px;
    height: 650px;
    position: absolute;
    top:-40px;
    left: -35px;
    background: rgba(0,0,0,.7);
    color: #FFFFFF;
    opacity: 0;
    transition-duration: 1s;
    z-index: 1;
}
.no2-item.on .no2-mask{
    opacity: 1;
    transition-duration: 1s;
}
.no2-item .no2-mask h2{
    display: block;
    font-size: 30px;
    writing-mode:vertical-rl;
    float: right;
    height: 80%;
    margin-top: 10%;
    margin-right: 20px;
    margin-left: 20px;
}
.no2-item .no2-mask p{
    display: block;
    font-size: 20px;
    writing-mode: vertical-rl;
    height: 90%;
    margin-top: 10%;
    float: right;
    text-align: justify;
    line-height: 30px;
}
.no4{
    width: 1050px;
    margin: 0 auto;
}
.no4-top{
    width: 650px;
    margin: 0 auto;
}
.no4-top li{
    display: block;
    float: left;
    width: 250px;
    height: 300px;
    background: #f0f0f0;
    border-radius: 5px;
}
.no4-top li img{
    display: block;
    margin: 50px auto;
}
.no4-top li h2{
    font-size: 24px;
    text-align: center;
}
.no4-top li:hover{
    background: #c40000;
    color: #fff;
}
.no4-top li:nth-of-type(2){
    float: right;
}
.no4-bottom{
    width: 1050px;
    margin: 0 auto;
    margin-top: 50px;
}
.no4-bottom li{
    display: block;
    float: left;
    width: 250px;
    height: 300px;
    background: #f0f0f0;
    border-radius: 5px;
    margin-right: 150px;
}
.no4-bottom li img{
    display: block;
    margin: 50px auto;
}
.no4-bottom li h2{
    font-size: 24px;
    text-align: center;
}
.no4-bottom li:hover{
    background: #c40000;
    color: #fff;
}
.no4-bottom li:nth-of-type(3) {
    margin-right: 0;
}