.sub-main{
    width: 100%;
    min-height: 500px;
    background-color: #ccc;
    position: relative;
    background-image: url(../img/sub/subbg.png);
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}
.sub-main::before{
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    background-color: #000;
    opacity: 0.3;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

/* sub-title */
.sub-title{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: 2;
    width: 100%;
}
.sub-title h6{
    font-size: 20px;
    font-weight: 300;
    text-align: center;
    color: #ccc;
    display: block;
    width: 100%;
}
.sub-title p{
    font-size: 60px;
    text-align: center;
    font-weight: 900;
    color: #fff;
    display: block;
    width: 100%;
}

/* nav */
nav{
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: #eee;
    z-index: 50;
}
.sub-nav-wrap{
    max-width: 1440px;
    margin: auto;
}
.sub-nav-wrap>ul{
    display: flex;
}
.sub-nav-wrap>ul>li{
    position: relative;
    border-left: 1px solid #ddd;
    box-sizing: border-box;
}
.sub-nav-wrap>ul>li>a{
    display: block;
    padding: 10px 50px;
    box-sizing: border-box;
}
.sub-nav-wrap>ul>li:last-child{
    border-right: 1px solid #ddd;
}
.home-btn{
    display: block;
    padding: 10px !important;
}
.sub-nav-sub{
    position: absolute;
    background-color: #658f99d9;
}
.sub-nav-sub{
    width: 100%;
    display: none;
}
.sub-nav-sub li a{
    display: block;
    width: 100%;
    text-align: center;
    padding: 15px 0;
    box-sizing: border-box;
    font-size: 14px;
    color: #fff;
}


/* sub-section */
.sub-title-text{
    padding: 50px 0;
    box-sizing: border-box;
}


@media screen and (max-width:1440px) {
    .sub-title p{
        font-size: 55px;
    }
}
@media screen and (max-width:1280px) {
    .sub-title p{
        font-size: 45px;
    }
    .sub-title h6{
        font-size: 18px;
    }
}
@media screen and (max-width:1024px) {
    .sub-title p{
        font-size: 40px;
    }
    .sub-title h6{
        font-size: 16px;
    }
    .sub-main{
        min-height: 400px;
    }
}
@media screen and (max-width:860px) {
    .sub-main{
        min-height: 350px;
    }
    .sub-nav-wrap>ul>li>a{
        padding: 10px 25px;
    }
    .dl-box{
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
}
@media screen and (max-width:550px) {
    .sub-title p{
        font-size: 35px;
    }
    .flex-col{
        flex-direction: column;
        align-items: flex-start !important;
        justify-content: flex-start;
    }
}