#main {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background: url(../images/main-bg.png) no-repeat left 120px;
    background-size: 100% auto;
    padding-top: 120px;
    padding-bottom: 100px;
}

.main {
    position: relative;
    height: 100%;
}

.plat-box {
    position: relative;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    height: 100%;
}

.plat {
    overflow: hidden;
    height: 100%;
    position: relative;
}

.plat-l {
    width: 63%;
    background-color: rgba(0, 0, 0, .7);
    padding: 40px 240px 100px 100px;
    box-sizing: border-box;
    position: absolute;
    left: 0;
    top: 0;
    height: 80%;
    top: 10%;
    overflow: hidden auto;
}

.plat-l::-webkit-scrollbar {
    width: 0!important;
}

.plat-l {
    -ms-overflow-style: none;
}

.plat-r {
    position: absolute;
    right: 0;
    width: 45%;
    box-sizing: border-box;
    margin-left: -9%;
    border: 23px solid #fff;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
}

.plat-l ul li {
    margin-bottom: 60px;
    overflow: hidden;
}

.plat-l ul li:last-child {
    margin-bottom: 0;
}

.plat-l ul li a {
    display: block;
    color: #fff;
}

.plat-l .p-t {
    overflow: hidden;
}

.plat-l .p-t h2 {
    float: left;
    font-size: 24px;
}

.plat-l .p-t .more {
    float: right;
    padding-left: 25px;
    background: url(../images/more.png) no-repeat left center;
    transition: all .3s;
    display: none;
}

.plat-l ul li.on .more {
    transform: translatex(-5px);
    display: block;
}

.plat-l .p-text {
    position: relative;
    top: 0;
    height: 0;
    transition: all .3s;
}

.plat-l .p-text p {
    font-size: 18px;
    line-height: 36px;
    height: 72px;
    overflow: hidden;
}

.plat-l ul li.on .p-text {
    position: relative;
    height: 78px;
    padding: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, .2);
}

@media screen and (max-width:1600px) and (max-height: 900px) {
    .plat-l {
        padding-top: 50px;
        padding-bottom: 50px;
    }
    .plat-r {
        margin-top: 50px;
    }
}

@media screen and (max-height: 7680px) and (max-width:1366px) {
    .plat-l ul li {
        margin-bottom: 30px;
    }
    .plat-r {}
    .plat-l {
        padding-top: 30px;
        padding-bottom: 30px;
    }
}

@media screen and (max-width: 1280px) and (max-height:720px) {
    .plat-l {
        padding-left: 50px;
        padding-right: 120px;
    }
    .plat-r {
        margin-top: 30px;
    }
}

@media screen and (max-width: 1024px) {
    .header,
    #main,
    .footer,
    .plat-box {
        position: static;
    }
    .plat-box {
        left: auto;
        top: auto;
        transform: none;
    }
    #main {
        padding-top: 10px;
        padding-bottom: 10px;
        background-position: top center;
        background-size: cover;
    }
.plat-l{position: static;height:auto;top:auto;width:100%;}
.plat-r{position: static;right:auto;width:auto;top:auto; transform:none;}

}

@media screen and (max-width: 800px) {
    .plat-r {
        float: none;
        width: auto;
        margin-top: 0;
        margin-left: 0;
    }
    .plat-l {
        float: none;
        width: auto;
        padding: 20px;
    }
}

@media screen and (max-width: 600px) {
    .plat-r {
        border: 10px solid #fff;
    }
    .plat-l .p-t h2 {
        font-size: 20px;
    }
    .plat-l .p-text p {
        font-size: 14px;
    }
}