.modelbox{
    margin-top: -20rem;
}
 


.main1{ 
    position: relative;    
}
.main1 .videobox{
    position: relative;
    overflow: hidden;
    border-radius: 0.8rem;
}
.main1 .videobox video{
    width: 100%;
    display: block;
}
.main1 .videobox .poster{
    position: absolute;
    top:50%;
    left: 50%;
    transform: translate(-50%,-50%);
}
.main1 .videobox:hover .poster{
    width: 105%; 
}
.main1 .videobox .play{
    position: absolute;
    left: calc(50% - 4.2rem);
    top: calc(50% - 4.2rem);
    width: 8.4rem;
    height: 8.4rem;
    cursor: pointer;
}

.main4 {
    position: relative; 
    padding-top: 4.5rem;
    padding-bottom: 15rem;
} 
.main4 .navbox{
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.2rem;
    font-weight: 500;
    line-height: 3.3rem;
    text-align: center;
    letter-spacing: 0.1em;
    color: #231815;
    margin-bottom: 4.8rem;
}
.main4 .navbox p{
    padding: 0.8rem 2rem;
    border-radius: 2.5rem;
    margin: 0 6rem;
    font-family: 'sans-serif', serif;  
    font-weight: 400; 
    position: relative;
    white-space: nowrap;
    cursor: pointer;
}
.main4 .navbox p:hover{
    color: #AF3230;
}
.main4 .navbox p.on{
    background: #FAF3F3;
    font-family: 'sans-serif-bold', serif; 
    font-weight: bold;
    color: #AF3230;
}
.main4 .navbox p+p::before{
    content: '';
    width: 0px;
    height: 2.5rem;
    opacity: 0.1; 
    border: .1rem solid #231815;
    position: absolute;
    left: -6rem;
    top: calc(50% - 1.25rem);
}
.main4 .conbox .box{
    display: none;
}
.main4 .conbox .box.on{
    display: block;
}
.main4 .conbox .box .imgbox{
    overflow: hidden;
    position: relative;
    border-radius: 0.9rem;
}
.main4 .conbox .box .imgbox:hover .bg{
    transform: scale(1.1);
}
.main4 .conbox .box .imgbox .txtimg{
    position: absolute;
    top: 5rem;
    left: 11.7rem;
    width: 10.35rem;
}
.main4 .conbox .box .txt{
    font-size: 2.0rem;
    font-weight: 250;
    line-height: 3.4rem;
    text-align: center;
    letter-spacing: 0.2em;
    color: rgba(35, 24, 21, 0.8);
    margin: 6rem auto 2.4rem; 
}
.main4 .conbox .box .tips{
    font-size: 1.4rem;
    font-weight: 250;
    line-height: 2.4rem;
    text-align: center; 
    color: rgba(35, 24, 21, 0.8);
}



/* 移动端兼容 */
@media screen and (max-width:750px) { 
    .modelbox{
        margin-top: 0rem;
    }
     
.main1 .videobox .play{ 
    left: calc(50% - 2.2rem);
    top: calc(50% - 2.2rem);
    width:4.4rem;
    height:4.4rem; 
}
.main4 {
    position: relative; 
    padding-top: 0;
    padding-bottom: 0;
}   
.main4 .conbox .box{
    display: block;
    border-radius: 2rem 2rem 0 0; 
    background: linear-gradient(180deg, #FFFFFF 0%, rgba(255, 255, 255, 0) 100%);
    box-shadow: inset 0px 1px 0px 0px #EEEEEE;
    padding-bottom: 2rem;
}
.main4 .conbox .box+.box{
    margin-top: -2rem;
}
.main4 .conbox .box.on{
    background:url(../images/bg4.png) center bottom/cover no-repeat transparent;    
}
.main4 .conbox .box .titbox{
    padding: 1.6rem 0;
    display: flex!important;
    justify-content: space-between;
    align-items: center;
    font-size: 1.4rem;
    line-height: 2.8rem; 
    color: #231815;
}
.main4 .conbox .box .titbox .ico{
    width: 1.4rem;
    display: block;
    transition: all 0.3s ease 0s;
}
.main4 .conbox .box.on .titbox .ico{
    transform: rotate(-180deg);
}
.main4 .conbox .box .overbox{
    display: none;
    padding-bottom: 2rem;
} 
.main4 .conbox .box.on .overbox{
    display: block;
}
.main4 .conbox .box .imgbox{
    overflow: hidden;
    position: relative; 
    border-radius: 0.9rem;
} 
.main4 .conbox .box .imgbox .txtimg{
    display: none;
}
.main4 .conbox .box .txt{
    font-size: 1.2rem;
    line-height: 2rem;
    margin: 1.6rem auto ; 
}
.main4 .conbox .box .tips{
    font-size: 1.2rem;
    line-height: 2rem;
}


}