@media (max-width : 768px) {
    /* header navigation */
    header{
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        z-index: 1000;
    }
    .header{
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 65px;
        padding:10px;
        z-index:999;
        -webkit-transition: all 0.3s;
        -moz-transition: all 0.3s;
        transition: all 0.3s;
    }
    .header > .row{
            margin-left: 0px;
    }
    .header.shrink{
        height: 65px !important;
        padding-top: 10px;
        padding-bottom: 10px;
    }
    .header .logo_img{
        width: 80px;
    }
    .header .btn_nav{
        height: 30px;
    }
    
    .header.shrink{
        background: #555;
    }
    .header.shrink .logo_img{
        width: 60px;
    }
    
    .header.shrink .btn_nav{
        height: 20px;
    }
    /* 배너 다음 섹션이 적절히 위치하도록 */
    #main_banner + section {
        margin-top: 0;
    }

    nav .content{
        gap : 20px;
        padding-top: 10vh;
        padding-left: 15vw;
        padding-right: 15vw;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: flex-start;
        flex-wrap: nowrap;
    }
    nav .menu ul li a{
        font-size: 42px;   
    }
    nav .direct_contact ul li {
        margin-bottom: 15px;
    }
    nav .direct_contact ul li a{
        font-size: 18px;
    }
    nav .sns{
        margin-top: 20px;
    }

   /* main_banner 기본 스타일 수정 - 전체 화면 크기 */
   #tab_cap > .h2_medium, #tab_print > .h2_medium{
    font-size: 15px;
    line-height: 20px;

   }
    #main_banner{
        text-align: center;
        width: 100vw;
        height: 100vh;
        min-height: 100vh;
        position: relative;
        overflow: hidden;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        margin: 0;
        padding: 0;
    }

    /* 배경 이미지를 위한 가상 요소들 */
    #main_banner::before,
    #main_banner::after {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-size: cover;
        background-position: center center;
        background-repeat: no-repeat;
        transition: opacity 2s ease-in-out;
        z-index: -1;
    }

    /* 첫 번째 배경 이미지 */
    #main_banner::before {
        background-image: url('../img/main_top_banner1.png');
        opacity: 1;
    }

    /* 두 번째 배경 이미지 */
    #main_banner::after {
        background-image: url('../img/main_top_banner2.png');
        opacity: 0;
    }

    .main_img{
        width: 100%;
    }
    .main_img img{
        max-width: 90%;
    }
    /* 페이드 전환 클래스 */
    #main_banner.fade-second::before {
        opacity: 0;
    }

    #main_banner.fade-second::after {
        opacity: 1;
    }

    /* 텍스트 내용이 배경 위에 오도록 z-index 설정 */
    #main_banner > * {
        position: relative;
        z-index: 1;
    }
    #about{
        float: left;
        width: 100%;
        padding-top: 30px;
        padding-bottom: 30px;
    }
    .main_con_left{
        float: left;
        width: 40%;
    }
    .main_con_left img{
        width: 80%;
    }
    .main_con_right{
        float: left;
        width: 40%;
        margin-left: 5%;
        margin-right: 5%;
    }
    .txt_center{
        text-align: center;
    }
    .dot_area{
        padding: 60px 0 0;
    }
    .dot{
        width: 6px;
        height: 6px;
    }
    .fsize_B{
        font-size: 30px;
        line-height: 35px;
    }
    .pb-5{
        padding-bottom: 1rem!important;
    }
    .service_tab ul{
        justify-content: flex-start;
    }
    .service_tab ul li {
        height: 60px;
        width: 50%;
        padding-top: 15px;
        padding-bottom: 15px;
        text-align: center;
    }
    .service_content_area {
        padding: 30px 10px;
    }
    .service_content p{
        font-size: 16px;
        line-height: 25px;
    }
    .cta_area{
        
    }
    .cta_area button{
        width: 150px;
        height: 45px;
        margin-right: 8px;
        margin-bottom: 10px;
        padding-left: 15px;
    }
    .cta_area button:after{
        top: 15px;
    }
    .site_img{
        width: 90%;
        margin-top: 30px;
    }
    .experience_nav{
        width: 100%;
        height: 100%;
    }
    .swiper-button-prev{
        top: 0;
        display: none;
    }
    .swiper-button-next{
        top: 0;
        display: none;
    }
    .experience{
        width: 100%;
        padding-bottom: 0;
        margin:0px !important;
    }
    #bt_swiper_pref, #bt_swiper_next{
        display: none;
    }
    .swiper-wrapper .swiper-slide{
        border-radius: 10px;
        overflow: hidden;
    }
    .swiper-wrapper img{
        width: 90%!important;
    }
    .swiper-container {
        width: 90%;
        height: 250px;
        margin-left: 5%;
        margin-right: 5%;
    }
    .news_tab {
        padding: 20px 0;
    }
    .news_tab ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 13px 5px;
    }
    .content_table ul li .container {
        align-items: center;
    }
    .news_content .news_cate{
        font-weight: 400;
        font-size: 14px;
        line-height: 20px;
        width: 35%;
    }
    .news_content .news_head{
        font-weight: 700;
        font-size: 18px;
        line-height: 30px;
        width: -webkit-fill-available;
    }
    #news{
        padding-bottom: 0;
    }
    #noti_main{
        display: none;
    }
    #noti_mobile{
        display: block;
        float: left;
        width: 100%;
        margin-bottom: 30px;
    }
    #fb_main{
        float: left;
        width: 100%;
        text-align: center;
    }



    /* footer */
    footer{
        padding: 30px 10px 30px;
        font-size: 0.8em;
        float: left;
        width: 100%;
    }
    .footer_logo img{
        width: 60px;
        margin-top: 5px;
        margin-bottom: 10px;
    }
    .footer_block p{
        font-size: 16px;
        line-height: 22px;
    }
    .footer_block ul li a{
        font-size: 12px;
    }
    .info{
        display: block;
        width:100%;
    }
    .info a{
        font-size: 12px;
        display: block;
    }
    .cta_contact button{
        padding: 8px 20px;
        font-size: 14px;
        margin-right: 10px;
    }
    .cta_contact, .cta_contact > a{
        color: #fff;
    }


    /* 인재영입 */
    #recruit, #culture, #cta_recruite, #more_info{
        padding: 60px 10px;
    }
    #recruit{
        padding-top: 40px;
    }
    .recruit_content{
        margin-top: 10px;
    }
    .cta_recruit{
        margin-top: 20px;
        height: fit-content;
        text-align: left;
    }

    /* 트리플앤 */
    #introduce{
        padding-top:130px;
    }
    .intro_title{
        font-size: 26px;
        line-height: 1.5em;
    }
    .diagram_circle_area{
        flex-wrap: wrap;
    }
    .diagram_circle{
        width: 80%;
        border-radius: 40%;
        border: 1px solid #0075BE;
        position: relative;
        text-align: center;
        margin-top: 30px;
    }

    /* 서비스(솔루션) */
    .solution_card{
        width: 100%;
        padding-top: 50px;
        padding-bottom: 40px;
    }
    .solution_site_img{
        height: 280px !important;
        overflow-y: hidden;
        margin-bottom: 20px;
    }

    #sub_con_area{
        margin-top: 85px;
        float: left;
        width: 100%;
        background: #fff;
        padding-top: 10px;
        padding-bottom: 10px;
    }

}

@media (min-width: 992px and max-width : 1200px){
    .service_tab{
        max-width: 1140px;
    }
    .solution_card{
        width: 100%;
     
    }
    #sub_con_area{
        margin-top: 120px;
        float: left;
        width: 100%;
        background: #fff;
        padding-top: 10px;
        padding-bottom: 10px;
    }
    .fsize_B{
        font-size: 45px;
        line-height: 50px;
    }
    #noti_main{
        display: none;
    }
    #noti_mobile{
        float: left;
        width: 100%;
        margin-bottom: 30px;
        display: block;
    }
    #fb_main{
        float: left;
        width: 100%;
        text-align: center;
    }
}

@media (min-width: 769px and max-width : 992px){
    .service_tab{
        max-width: 960px;
    }
    #sub_con_area{
        margin-top: 75px;
        float: left;
        width: 100%;
        background: #fff;
        padding-top: 10px;
        padding-bottom: 10px;
    }
    .fsize_B{
        font-size: 40px;
        line-height: 45px;
    }
    #noti_main{
        display: none;
    }
    #noti_mobile{
        float: left;
        width: 100%;
        margin-bottom: 30px;
        display: block;
    }
    #fb_main{
        float: left;
        width: 100%;
        text-align: center;
    }
}