.index-about-box{
    width: 100%;
    display: block;
    position: relative;
}
.index-about-all-box{
    width: 1200px;
    max-width: 100%;
    display: block;
    margin: 0 auto;
    font-size: 0;
    position: relative;
    box-sizing: border-box;
    padding: 100px 0;
    z-index: 1;
}
.index-about-bc{
    width: 100%;
    height: 100%;
    display: block;
    position: absolute;
    pointer-events: none;
    top: 0;
    left: 0;
    z-index: 0;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}
.index-about-bc-mask{
    width: 100%;
    height: 100%;
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    background-color: #000;
    opacity: 0.6;
}
.index-about-title-box{
    display: inline-block;
    vertical-align: top;
}
.index-about-title-en{
    font-family: "Roboto";
    font-weight: 700;
    font-size: 52px;
    color: #fff;
    display: block;
    letter-spacing: 6px;
    line-height: 56px;
}
.index-about-title-ch{
    font-size: 16px;
    color: #fff;
    display: block;
    letter-spacing: 2px;
    text-align: right;
    box-sizing: border-box;
    padding-right: 5px;
}
.index-about-text-box{
    width: calc(100% - 201px);
    display: inline-block;
    vertical-align: top;
    box-sizing: border-box;
    padding-left: 10px;
}
.index-about-text-name{
    font-size: 22px;
    color: #fff;
    font-weight: bold;
    letter-spacing: 2px;
}
.index-about-text{
    font-size: 16px;
    color: #fff;
    letter-spacing: 1px;
    font-weight: lighter;
    line-height: 2.4;
}
.index-about-more{
    border: 1px solid #fff;
    display: block;
    width: 160px;
    font-size: 16px;
    line-height: 46px;
    color: #fff;
    letter-spacing: 1px;
    text-align: center;
    margin-top: 20px;
    cursor: pointer;
    transition: all .3s linear;
}



/*-----hover-----*/
.index-about-more:hover{
    border-color: #ff6800;
    background-color: #ff6800;
    color: #fff;
}


@media only screen and (max-width: 1200px){
    .index-about-all-box{
        width: 1000px;
    }
}
@media only screen and (max-width: 1000px){
    .index-about-all-box{
        width: 750px;
    }
    .index-about-title-en{
        font-size: 44px;
    }
}
@media only screen and (max-width: 750px){
    .index-about-all-box{
        width: 95%;
        padding: 50px 0;
    }
    .index-about-title-box{
        display: block;
    }
    .index-about-title-en{
        font-size: 36px;
        line-height: initial;
    }
    .index-about-title-ch{
        text-align: left;
        padding-right: 0;
        font-size: 14px;
    }
    .index-about-text-box{
        width: 100%;
        padding-left: 0;
        margin-top: 10px;
    }
    .index-about-text-name{
        font-size: 18px;
    }
    .index-about-text{
        font-size: 14px;
        line-height: 2;
    }
}
@media only screen and (max-width: 550px){
    .index-about-all-box{
        padding: 30px 0;
    }
    .index-about-title-en{
        font-size: 26px;
    }
    .index-about-text-name{
        font-size: 16px;
    }
    .index-about-text{
        font-size: 12px;
    }
    .index-about-text-box{
        margin-top: 5px;
    }
    .index-about-more{
        width: 120px;
        font-size: 14px;
        line-height: 36px;
    }
}
@media only screen and (max-width: 400px){
    .index-about-all-box{
        padding: 10px 0;
    }
    .index-about-title-en{
        font-size: 20px;
        letter-spacing: 4px;
    }
    .index-about-title-ch{
        font-size: 12px;
    }
    .index-about-text-name{
        font-size: 14px;
    }
}



/*animation*/

@-webkit-keyframes fade-mask {
  from {
    opacity: 0;
   
  }

  to {
    opacity: 0.6;

  }
}
@media only screen and (min-width: 1001px){
    .index-about-bc,
    .index-about-bc-mask,
    .index-about-title-en,
    .index-about-title-ch,
    .index-about-text-name,
    .index-about-text,
    .index-about-more{
        opacity: 0;
    }
    .index-about-box.anima .index-about-bc{
        animation: fade 1s ease 0s 1 both;
    }
    .index-about-box.anima .index-about-bc-mask{
        animation: fade-mask 1s ease 0.3s 1 both;
    }
    .index-about-box.anima .index-about-title-en{
        animation: fadeInLeft 1s ease .6s 1 both;
    }
    .index-about-box.anima .index-about-title-ch{
        animation: fadeInLeft 1s ease 0.6s 1 both;
    }
    .index-about-box.anima .index-about-text-name{
        animation: fadeInRight 1s ease 0.7s 1 both;
    }
    .index-about-box.anima .index-about-text{
        animation: fadeInRight 1s ease 0.7s 1 both;
    }
    .index-about-box.anima .index-about-more{
        animation: fadeInUp 1s ease 0.7s 1 both;
    }
}