.index-banner-box{
    width: 100%;
    display: block;
    position: relative;
    overflow: hidden;
    margin-top: 80px;
    margin-bottom: 70px;
}
.index-banner-box,
.index-banner-list,
.index-video-box,
.index-video,
.index-video-bg{
     height:calc(100vh - 150px);
}
.index-banner-list-box{
    width: 100%;
    display: block;
    position: relative;
    
}
.index-banner-list{
    width: 100%;
    display: block;
     position: relative;
}
.main-bg{
    height: 100%;
    width: 100%;
    display: block;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    transition: all .5s ease;
}
.index-banner{
    width: 100%;
    height: 100%;
    display: block;
    position: relative;
}

.index-banner-slong{
    width: 100%;
    font-size: 50px;
    color: #333;
    cursor: context-menu;
    letter-spacing: 3px;
    font-family: "微軟正黑體";
    font-weight: bold;
}

.index-video-mask{
    width: 100%;
    height: 100%;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    background-color: #fff;
    z-index: 5;
    opacity: 0;
}
.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%;
    height: 100%;
    max-width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
    text-align: left;
    display: -webkit-flex;
    display:         flex;
    -webkit-align-items: center;
          align-items: center;
    padding: 0 50px;
    box-sizing: border-box;
}
.index-video-open{
    display: none;
}
.index-banner-img-mask{
    display: block;
    width: 300px;
    left: 0;
    height: 100%;
    position: absolute;
    z-index: 8;
    font-size: 0;
    top: 0;
    background-color: #FFF;
}

.index-banner-img-mask-bg{
    width: 200px;
    height: 200px;
    display: block;
    position: absolute;
    top: -100px;
    right: -100px;
    background-color: #FFF;
    transform: rotate(45deg);
}


/*--------------------------------*/
.banner-box{
    margin-top: 80px;
    width: 100%;
    height: 300px;
    position: relative;
}
.banner-img-box{
    width: 100%;
    height: 100%;
    display: block;
    background-color: #000;
    position: relative;
}
.banner-slong-box{
    position: absolute;
    top: calc(50% - 24px);
    width: 100%;
    left: 0;
}
.banner-slong{
    font-size: 30px;
    font-weight: bold;
    width: 1200px;
    max-width: 100%;
    display: block;
    margin: 0 auto;
    color: #FFF;
    letter-spacing: 4px;
}
.main-bg-mask{
    width: 100%;
    height: 100%;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    background-color: #000;
}

@media only screen and (max-width: 1680px){
    .index-banner-img-mask{
        width: 25%;
    }
    .index-banner-slong{
        font-size: 36px;
    }
}
@media only screen and (max-width: 1200px){
    .banner-slong{
        width: 95%;
    }
}
@media only screen and (max-width: 1000px){
    .index-banner-img-mask {
        width: 10%;
    }
    .banner-box{
        height: 230px;
    }
    .banner-slong{
        font-size: 20px;
    }
    .index-banner-box{
        margin-top: 70px;
    }
    .index-banner-box, .index-banner-list, .index-video-box, .index-video, .index-video-bg {
        height: calc(100vh - 140px);
    }
    .banner-box{
        margin-top: 70px;
    }
}
@media only screen and (max-width: 550px){
    .index-banner-img-mask {
        display: none;
    }
    .index-banner-box, .index-banner-list, .index-video-box, .index-video, .index-video-bg {
        height: 360px;
    }
    .index-banner-slong{
        font-size: 20px;
        letter-spacing: 1px;
    }
    .index-banner-slong-box{
        padding: 0 20px;
    }
    .index-banner-box{
        margin-bottom: 20px;
    }
}