.field_all{
    width: 100%; height: calc(100vh - 100px); 
    /* background: url(../../img/construction/bg.jpg) center/cover; */
    display: flex; flex-flow: column;
    justify-content: center; align-items: center;
    position: relative;
}
.av_system_bg{background: url(../../img/businessfield/avsystem.jpg) center/cover;}
.network_bg{background: url(../../img/businessfield/network.jpg) center/cover;}
.led_bg{background: url(../../img/businessfield/led.jpg) center/cover;}
.cctv_bg{background: url(../../img/businessfield/cctv.jpg) center/cover;}
.control_bg{background: url(../../img/businessfield/control.jpg) center/cover;}

.network_bg .title_text p,.network_bg .title_text h1{}
/* .control_bg .title_text{background-color: rgba(0, 0, 0, 0.4);} */


.field_all .title_text{padding: 20px 30px; border-radius: 20px;}
.field_all .title_text *{font-weight: 800; text-align: center;}
.field_all .title_text p{ 
    font-size: 0.625rem; letter-spacing:1.2em; font-weight: 200;
    margin-bottom: 10px; margin-left: 10px; color: #fff;
        text-shadow: 1px 1px 3px #000;/* 글자 그림자 */
    /* text-shadow: 가로 세로 번짐 색상 */
}
.field_all .title_text h1{
    font-size: 3.75rem;color: #fff; white-space: nowrap;
    text-shadow: 1px 1px 3px #000;/* 글자 그림자 */
    /* text-shadow: 가로 세로 번짐 색상 */
}
.field_all .field_all_move{
    display: flex; justify-content: center; align-items: center;
    width: 80%; padding: 30px 0 ; background-color: #fff;
    border-radius: 30px 30px 0 0 ;
    position: absolute; bottom: -1px; left: 50%;
    transform: translateX(-50%);
}
.field_all .field_all_move li{position: relative;}
.field_all .field_all_move li>a{margin: 0 30px;font-size: 1.25rem;}
.field_all .field_all_move li>a::after{
    content: ""; position: absolute; width: 1px; height: 100%; background-color: #a7a7a7;
    bottom: 0; left: 0;
}
.field_all .field_all_move li:first-child>a::after{display: none;}
.field_all .field_all_move li>a:hover{font-weight: 600;}

/* =================================== */

.field_all_textbox{
    width: 100%; padding: 100px 0; 
    position: relative; height: 600px;
    background-color: #f2f8ff;
}
.field_all_textbox .container{
    width: 80%; height: 500px; margin: 0 auto; 
    position: absolute; top: 0; left: 50%; transform: translateX(-50%);
    display: flex; justify-content: center; align-items: center;
    border-radius: 0 0 30px 30px; /* padding: 0 70px; */
    background-color: #fff; box-shadow: 0 2px 2px rgba(0, 0, 0, 0.2); /* 그림자 효과*/
}
.field_all_textbox .container .all_title{
    /* display: flex; flex-flow: column nowrap; justify-content: center; align-items: start; */
    width: 40%; height: 100%; position: relative; 
}
.field_all_textbox .container .all_title h2{
    font-size: 3.5rem; font-weight: 600; /* white-space: nowrap; */ width: 100%;
    position: absolute; top: 45%; left: 50%; transform: translate(-50%,-50%);
    line-height: 1.2; text-align: center;
}
.field_all_textbox .container .all_textbox{
    width: 60%; height: 100%; position: relative; 
}
.field_all_textbox .container .all_textbox p:first-child{
    font-size: 2rem; line-height: 1.5; font-weight: 200;
    position: absolute; top: 10%; left: 0%; padding: 10px; 
}
.field_all_textbox .container .all_textbox p:nth-child(2){
    font-size: 1.2rem; line-height: 1.5; padding: 10px; width: 100%;
    position: absolute; top: 45%; left: 0%; transform: translateY(-50%);
}
.field_all_textbox .container .all_textbox .place_img{
    width: 90%; height: 150px;
    background: url(../../img/businessfield/avsystem/place.jpg)no-repeat center center/contain;
    position: absolute; bottom: 10%; left: 0;
}

/* ============================이미지 박스 */

.field_all_imgbox{width: 100%; padding: 50px 0 200px 0; background-color: #f2f8ff;}
.field_all_imgbox .container{
    /* max-width: 1400px; min-width: 320px; */
    width: 80%; 
    margin: 0 auto; background-color: #f2f8ff;
}
.field_all_imgbox .container .imgbox{
    width: 100%; display: flex; justify-content: space-between;
    /* height: calc(100vh / 3); */
    height: 500px;
}
.field_all_imgbox .container div.imgbox:nth-child(2){margin: 50px 0;}
.field_all_imgbox .container .imgbox .img{width: 50%; background-color: #a7a7a7;} /* 이미지 */
/* ========================================================= */
.avsystem_img .container div.imgbox:first-child .img{background: url(../../img/businessfield/avsystem/av1.jpg) center/cover;}
.avsystem_img .container div.imgbox:nth-child(2) .img{background: url(../../img/businessfield/avsystem/av2.jpg) center/cover;}
.avsystem_img .container div.imgbox:last-child .img{background: url(../../img/businessfield/avsystem/av3.jpg) center/cover;}
.network_img .container div.imgbox:first-child .img{background: url(../../img/businessfield/network/network1.jpg) center/cover;}
.network_img .container div.imgbox:nth-child(2) .img{background: url(../../img/businessfield/network/network2.jpg) center/cover;}
.network_img .container div.imgbox:last-child .img{background: url(../../img/businessfield/network/network3.jpg) center/cover;}
.ied_img .container div.imgbox:first-child .img{background: url(../../img/businessfield/led/led3.jpg) center/cover;}
.ied_img .container div.imgbox:nth-child(2) .img{background: url(../../img/businessfield/led/led2.jpg) center/cover;}
.ied_img .container div.imgbox:last-child .img{background: url(../../img/businessfield/led/led1.jpg) center/cover;}
.cctv_img .container div.imgbox:first-child .img{background: url(../../img/businessfield/cctv/cctv1.jpg) center/cover;}
.cctv_img .container div.imgbox:nth-child(2) .img{background: url(../../img/businessfield/cctv/cctv2.jpg) center/cover;}
.cctv_img .container div.imgbox:last-child .img{background: url(../../img/businessfield/cctv/cctv3.jpg) center/cover;}
.control_img .container div.imgbox:first-child .img{background: url(../../img/businessfield/control/control1.jpg) center/cover;}
.control_img .container div.imgbox:nth-child(2) .img{background: url(../../img/businessfield/control/control2.jpg) center/cover;}
.control_img .container div.imgbox:last-child .img{background: url(../../img/businessfield/control/control3.jpg) center/cover;}
/* ========================================================= */
.field_all_imgbox .container .imgbox .img img{width: 100%;}
.field_all_imgbox .container .imgbox .text{
    width: 50%; display: flex; flex-flow: column nowrap; justify-content: center; align-items: center; 
    background-color: #fff;
}
.field_all_imgbox .container .imgbox .text h3{
    font-size: 1.8rem; font-weight: 600; margin-bottom: 30px;
}
.field_all_imgbox .container .imgbox .text p{
    font-size: 1.2rem; text-align: center;
    width: 90%; margin: 0 auto; line-height: 1.5;
}

/* ============================바로가기 */

.field_all_go{
    width: 100%; height: 300px;
    background: url(../../img/businessfield/field_all_go.jpg) center/cover;
}
.field_all_go a{
    display: block; width: 100%; height: 100%;
    position: relative; transition: all 0.5s;
    background-color: rgba(0, 0, 0, 0);
}
/* .field_all_go a:hover{background-color: rgba(0, 0, 0, 0.4);} */
.field_all_go a>span{display: block;position: absolute;}
.field_all_go a>span:first-child{
    font-size: 3rem; z-index: 10; font-weight: 200; color: #fff;
    bottom: 50%; transform: translateX(-50%); right: 350px;
    transition: all 0.5s;
}
.field_all_go a>span:last-child{
    height: 100%; top: 0; right: 260px; z-index: 9;
}
.field_all_go a>span>img{height: 100%;}

/* =================================== */


#topbtn{
    position: fixed; right: 260px; bottom: 550px;
    border-radius: 10px; width: 100px; line-height: 100px;
    padding: 30px;
    border: 1px solid #bbb; text-align: center;
    background: #fff; z-index: 1000;
    opacity: 0; visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease,border 0.4s;
    display: flex; justify-content: center; align-items: center;
}
#topbtn:hover {border: 1px solid #fff;}
#topbtn>img{width: 100%; height: 100%;}
/* 나타날 때의 클래스 */
#topbtn.show {opacity: 1; visibility: visible;}



@media screen and (max-width:1349px){ /* 태블릿 */
    /* ============================= 첫 화면 시작 */
    .field_all{height: calc(100vh - 80px); padding: 0 80px;}
    .field_all .field_all_text{padding: 30px; margin-top: 40px;}
    .field_all .field_all_move li>a{margin: 0 30px;font-size: 1rem;}
    /* ============================= 첫 화면 끝 */
    .field_all_textbox{height: 580px; padding: 80px 0; }
    .field_all_textbox .container{
        height: 500px; padding:0 80px; 
        flex-flow: column nowrap;
    }
    .field_all_textbox .container .all_title{width: 100%;height: 250px;}
    .field_all_textbox .container .all_title h2{font-size: 3rem;}
    .field_all_textbox .container .all_textbox{width: 100%;}
    .field_all_textbox .container .all_textbox p:first-child{
        font-size: 1.5rem; top: 10%;
    }
    .field_all_textbox .container .all_textbox p:nth-child(2){font-size: 1rem; top: 50%;}
    .field_all_textbox .container .all_textbox .place_img{width: 100%; height: 40%; bottom: 0;}
    /* ============================이미지 박스 */
    .field_all_imgbox{padding: 80px 0 150px 0;}
    .field_all_imgbox .container .imgbox{height: 350px;}
    .field_all_imgbox .container div.imgbox:nth-child(2){margin: 30px 0;}
    .field_all_imgbox .container .imgbox .text h3{font-size: 1.5rem;}
    .field_all_imgbox .container .imgbox .text p{font-size: 1rem;}
    /* ============================바로가기 */
    .field_all_go{height: 200px;}
    .field_all_go a>span:first-child{right: 140px; font-size: 2rem;}
    .field_all_go a>span:last-child{right: 100px}
    #topbtn{
    right: 20px; bottom: 400px; width: 100px; height: 50px;
    padding: 7px 30px; border-radius: 15px;
    }
}

@media screen and (max-width:699px){ /* 모바일 */
    /* ============================= 첫 화면 시작 */
    .field_all{
        height: calc(100vh - 60px);padding: 0 10px;
        justify-content: center; align-items: center;
    }
    .field_all .title_text p{margin-left: 15px;}
    .field_all .title_text h1{font-size: 2.5rem;}
    .field_all .field_all_text{padding: 15px; margin-top: 30px;}
    .field_all .field_all_text p{font-size: 0.625rem;}
    .field_all .field_all_move{padding: 20px 0 ;}
    .field_all .field_all_move li>a{margin: 0 10px; font-size: 0.875rem;}
    /* ============================= 첫 화면 끝 */
    .field_all_textbox{height: 420px; padding: 50px 0;}
    .field_all_textbox .container{height: 350px; padding:0 10px; }
    .field_all_textbox .container .all_title{width: 100%; height: 100px;}
    .field_all_textbox .container .all_title h2{
        width: 100%; font-size: 2.5rem; text-align: center;
    }
    .field_all_textbox .container .all_textbox{height: 250px;}
    .field_all_textbox .container .all_textbox p:first-child{
        width: 100%; font-size: 1rem; top: 5%; padding: 0 10px; padding: 0;
    }
    .field_all_textbox .container .all_textbox p:nth-child(2){
        font-size: 0.825rem; top: 0%; padding: 0 0;line-height: 1.3; top: 47%; 
    }
    .field_all_textbox .container .all_textbox .place_img{width: 100%; bottom: 5%;}
    .field_all_textbox .container .all_textbox .place_img img{display: none;}
    /* ============================이미지 박스 */
    .field_all_imgbox{padding: 30px 0 50px 0;}
    .field_all_imgbox .container{width: 100%; padding: 0 20px;}
    .field_all_imgbox .container .imgbox{flex-flow: column nowrap; }
    .field_all_imgbox .container .imgbox .img{width: 100%; height: 300px;}
    .field_all_imgbox .container div.imgbox:nth-child(2){
        margin: 20px 0; flex-direction: column-reverse;/* 부모 아래의 모든 자식 요소의 전체 순서를 뒤집음 */
    }
    .field_all_imgbox .container .imgbox .text{width: 100%; height: 300px;}
    .field_all_imgbox .container .imgbox .text h3{font-size: 1.2rem;margin-bottom: 10px;}
    .field_all_imgbox .container .imgbox .text p{font-size: 0.825rem;}
    /* ============================바로가기 */
    .field_all_go{height: 100px;}
    .field_all_go a>span:first-child{right: 25px; font-size: 1.2rem;}
    .field_all_go a>span:last-child{right: 10px}
    #topbtn{
    right: 20px; bottom: 225px;
    border-radius: 10px; width: 80px; height: 40px;
    padding: 5px 25px;
    }
}