.index-introduces-box{
    width: 100%;
    display: block;
    position: relative;
    overflow: hidden;
    background-color: #fff;
    box-sizing: border-box;
    padding: 10.9375rem 0;
}
.index-introduces-all-box{
    width: calc(100% - ((280 / 1920) * 100vw));
    display: block;
    margin-left: auto;
    font-size: 0;
}
.index-introduces-text-box{
    font-family: "Noto Serif TC";
    font-weight: 300;
    font-size: 1rem;
    letter-spacing: 0.1em;
    line-height: 2.25rem;
    color: #666;
    margin-top: 5rem;
}
.index-introduces-text-box span{
    font-weight: 300;
    display: block;
    margin-bottom: 3.75rem;
}
.index-introduces-text-box p{
    color: #000;
}
.index-introduces-left-box{
    width: calc(100% - ((800 / 1920) * 100vw));
    display: inline-block;
    vertical-align: middle;
    box-sizing: border-box;
    padding-right: 5rem;
}
.index-introduces-right-box{
    width: calc((800 / 1920) * 100vw);
    height: calc((600 / 800) * ((800 / 1920) * 100vw));
    display: inline-block;
    vertical-align: middle;
}




@media only screen and (max-width: 1000px){
    .index-introduces-box{
        padding: 5rem 0;
    }
    .index-introduces-all-box{
        width: calc(100% - ((20 / 280) * 100vw));
    }
}
@media only screen and (max-width: 768px){
    .index-introduces-box{
        padding: 3.75rem 0;
    }
    .index-introduces-all-box{
        width: 550px;
        max-width: 100%;
        margin: 0 auto;
    }
    .index-introduces-left-box{
        width: 100%;
        padding-right: 0;
    }
    .index-introduces-right-box{
        width: 100%;
        height: calc((600 / 800) * 550px);
        margin-top: 1.875rem;
    }
    .index-introduces-text-box{
        margin-top: 1.5rem;
        line-height: 1.4;
    }
    .index-introduces-text-box span{
        margin-bottom: 1.25rem;
    }
}
@media only screen and (max-width: 550px){
    .index-introduces-box{
        padding: 1.625rem 0;
    }
    .index-introduces-all-box{
        width: calc(100% - 40px);
    }
    .index-introduces-text-box{
        margin-top: 1.25rem;
        line-height: 1.2;
    }
    .index-introduces-right-box{
        height: calc((600 / 800) * (100vw - 40px));
        margin-top: 1.25rem;
    }
}



@media only screen and (min-width: 769px){
    .index-introduces-right-box,
    .index-introduces-text-box span,
    .index-introduces-text-box p{
        opacity: 0;
    }
    .index-introduces-right-box.anima{
        animation: fadeInRight 1.4s ease 0s 1 both;
    }
    .index-introduces-text-box.anima span,
    .index-introduces-text-box.anima p{
        animation: fadeInDown 1.4s ease 0s 1 both;
    }
}