.index-banner-box{
    width: 100%;
    display: block;
    position: relative;
    overflow: hidden;
    margin-top: 7.5rem;
    background-color: #000;
}
.index-banner-box,
.index-banner-list,
.index-video-box,
.index-video,
.index-video-bg{
    height: calc(100vh - 7.5rem);
}
.index-banner-list-box{
    width: 100%;
    display: block;
    position: relative;
    
}
.index-banner-list{
    width: 100%;
    display: block;
    position: relative;
}
.index-banner-list span{
    height: 100%;
    width: 100%;
    display: block;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    opacity: 0.7;
}
.index-banner{
    width: 100%;
    height: 100%;
    display: block;
    position: relative;
}
.index-video-mask_img{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    opacity: 0.2;
    z-index: 1;
}
.index-banner-slong,
.index-video-slong{
    width: 100%;
    text-align: center;
    font-size: 3.125rem;
    font-family: "Noto Serif TC";
    font-weight: 700;
    letter-spacing: 0.2em;
    color: #FFF;
    display: block;
    position: absolute;
    z-index: 9;
    top: -50%;
    cursor: context-menu;
}
.index-video-mask{
    width: 100%;
    height: 100%;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    background-color: #000;
    opacity: 0.4;
    z-index: 5;
}
.index-video-box{
    width: 100%;
    display: block;
    position: relative;
}
.index-video{
    width: 100%;
    height: 100%;
    position: relative;
    z-index: 5;
    display: block;
}

.index-video-bg{
    width: 100%;
    height: 100%;
    display: block;
    position: absolute;
    z-index: 1;
    top: 0;
    left: 0;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

.index-banner-slong-box{
    width: 100%;
    display: block;
    position: absolute;
    top: 44%;
    left: 0;
    z-index: 5;
    pointer-events: none;
    text-align: center;
}
.index-video-open{
    display: none;
}
.not-banner{
    display: none;
}



@media only screen and (max-width: 1000px){
    .index-banner-box{
        margin-top: 5rem;
    }
    .index-banner-slong,
    .index-video-slong{
        font-size: 1.75rem;
    }
    .index-banner-box, 
    .index-banner-list, 
    .index-video-box, 
    .index-video, 
    .index-video-bg {
        height: calc((1200 / 1920) * 100vw);
    }
}
@media only screen and (max-width: 550px){
    .index-banner-slong-box{
        top: 39%;
    }
    .index-banner-slong,
    .index-video-slong{
        font-size: 1.25rem;
        letter-spacing: 0.06em;
        box-sizing: border-box;
        padding: 0 20px;
    }
}
@media only screen and (max-width: 400px){
    .index-banner-box{
        margin-top: 3.125rem;
    }
}