html {
    height: 100vh;
    position: relative;
    background-color: #f4f4f4;
    scroll-behavior: smooth;
    /* overflow: hidden; */
}

/* 쏘아 올라가는 공 컨테이너 */
/* balls container */
/* 화면 위치만 고정해두고, 나머지 작업은 전부 js */
/* viewpoint가 px이 아닌 %로 구성되어있기 때문에 반응형으로 작동합니다. */
#balls-container {
    display: flex;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    position: fixed;
    pointer-events: none;
}

.column {
    flex: 1;
    position: relative;
}

.ball {
    height: 150px;
    width: 30px;
    position: absolute;
    bottom: 0;
    border-radius: 15px;
    pointer-events: all;
    filter: blur(5px);
}ㄹㄹ


/* 제17회 공주대 디컨 온라인 졸업전시 웹사이트로 이동을 도와주는 버튼입니다 */
/* 현재는 졸업전시 웹사이트 개발 전이라 모달창이 띄워지도록 작업했습니다 */

/* 버튼 */
.enterbtn {
    display: inline-flex;
    /* justify-content: center; */
    align-items: center;
    
    font-size: 16px;
    font-weight: 600;
    line-height: normal;
    text-transform: capitalize;
}

.enter-icon {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.callbtn {
    display: inline-flex;
    /* justify-content: center; */
    align-items: center;

    font-size: 12px;
    font-weight: 600;
    line-height: normal;
    text-transform: capitalize;
}

.call-icon {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}



/* 인터렉션 기능이 들어간 버튼입니다 */
.button {
    display: inline-flex; 
    border-radius: 999px;
    color: var(--black, #000);
    border: none;
    background: var(--white);
    fill: var(--black);
}

.button:hover {
    color: var(--white, #FFF);
    fill: var(--white, #FFF);
    background-color: var(--black);
    cursor: pointer;
}

.button:active {
    color: var(--white);
    fill: var(--white);
    background-color: var(--black);
    cursor: pointer;
}


/* 데코레이션용 화살표 (detail 중간) */
/* Arrow for Decoration (middle of the details) */
.arrow-to-right {
    width: 34px;
    height: 34px;
    flex-shrink: 0;
    fill: var(--white, #FFF);
    align-items: center;
}

.arrow-to-left {
    width: 34px;
    height: 34px;
    transform: rotate(90deg);
    flex-shrink: 0;
    fill: var(--white, #FFF);
    align-items: center;
}

span {
    font-weight: 600;
}

/* 모바일, 태블릿에서만 달라지는 줄바꿈 break-m, -t 클래스 명을 설정했습니다 */
/* 필요한 경우에만 inline으로 추가해주세요 */
br.break-m {
    display: none;
}

br.break-t {
    display: none;
}

/* 초대장은 intro, detail, footer로 구성되어있습니다. */
/* intro */
#intro {
    display: flex;
    height: 100vh;
    flex-direction: column;
    align-items: center;
    align-self: stretch;
    justify-content: center;

}

#intro-textbox {
    display: flex;
    flex-direction: column;
}

.intro-title {
    text-align: center;
    font-style: normal;
    font-weight: 800;
    line-height: 130%;
    letter-spacing: -0.36px;
}

.intro-content {
    text-align: center;
    font-style: normal;
    font-weight: 300;
    line-height: 160%;
    letter-spacing: -0.36px;
    text-transform: uppercase;
}


/* 버튼을 누르면 뜨는 안내용 모달 혹은 팝업창 입니다 */
.overlay {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    transition: opacity 500ms;
    visibility: hidden;
    opacity: 0;
    z-index: 900;
}

.overlay:target {
    visibility: visible;
    opacity: 1;
}

.popup {
    /* display: grid; */
    position: fixed;
    border-radius: 10px;
    width: max-content;
    /* grid-template-columns: minmax(120px, max-content) 1fr; */
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, .9);
    /* "delay" the visibility transition */
    -webkit-transition: opacity .5s, visibility 0s linear .5s;
    transition: opacity .5s, visibility 0s linear .5s;
    z-index: 1;

    font-size: 16px;
    font-style: normal;
}

.popup:target {
    visibility: visible;
    opacity: 1;
    /* cancel visibility transition delay */
    -webkit-transition-delay: 0s;
    transition-delay: 0s;
}

.popup .close {
    position: absolute;
    right: 5px;
    top: 5px;
    padding: 5px;
    color: var(--black, #000);
    transition: color .3s;
    font-size: 2em;
    line-height: .6em;
    text-decoration-line: none;
}

.popup .close:hover {
    color: var(--green);
}


/* detail*/
#detail {
    display: flex;
    flex-direction: column;
    align-items: center;
    align-self: stretch;
}

.detail-left {
    display: flex;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.detail-right {
    display: flex;
    width: 100%;
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
}

.detail-title {
    display: inline-flex;
    
    text-align: center;
    font-style: normal;
    font-weight: 700;
    line-height: 130%;
    text-transform: uppercase;
}

.detail-content {
    font-style: normal;
    font-weight: 300;
    line-height: 170%;
    letter-spacing: -0.2px;
    text-transform: uppercase;
}

#map {
    width: 100vw;
    height: 300px;  
}

.htc-textbox {
    background-color: var(--white);
    box-shadow: 14px 14px 30px 0px rgba(0, 0, 0, 0.08);
    border-radius: 30px;
    text-wrap: nowrap;

    font-style: normal;
    font-weight: 300;
    line-height: 160%;
    letter-spacing: -0.32px;
}

.htc-content {
    padding-top: 4px;
    padding-left: 16px;
}




/* Mobile - xs */
@media (min-width:320px) {
    /* font-size: 16px; */

    /* 버튼 */
    .enterbtn {
        padding: 14px 28px 14px 34px;
        gap: 10px;
    
        font-size: 16px;
    }
    
    .enter-icon {
        width: 16px;
        height: 16px;   
    }
    
    
    .callbtn {
        padding: 10px 20px;
        gap: 10px;
    
        font-size: 12px;
    }
    
    .call-icon {
        width: 12px;
        height: 12px;
    }

    /* 브레이크 포인트 */
    br.break-m {
        display: inline;
    }
    
    br.break-t {
        display: inline;
    }

    /* 온라인초대장 디자인 */
    #intro {
        gap: 50px;

    }
    
    #intro-textbox {
        gap: 40px;
    }
    
    .intro-title {
        font-size: 36px;
    }
    
    .intro-content {
        font-size: 18px;
    }

    .popup {
        padding: 30px;
        font-size: 16px;
    }


    /* detail은 시간 및 장소 등의 정보를 보여줍니다. */
    #detail {
        padding-bottom: 40px;
        gap: 68px;
    }

    .detail-left {
        padding-left: 40px;
        gap: 40px;
    }

    .detail-right {
        padding-right: 40px;
        gap: 40px;
    }

    .detail-title {
        gap: 10px;
        font-size: 18px;
    }

    .detail-content {
        font-size: 20px;
    }

    .arrow-to-right {
        width: 34px;
        height: 34px;
    }

    .arrow-to-left {
        width: 34px;
        height: 34px;
    }

    #map {
        height: 300px;  
    }

    .htc-textbox {
        /* position:absolute; */
        /* width: 100vw; */
        padding: 28px 24px;
        margin: 30px 20px;

        font-size: 16px;
    }

    .gap {
        padding-bottom: 30px;
    }

    .htc-content {
        padding-top: 4px;
        padding-left: 16px;
    }
    
}

/* Tablet Portrait - s */
@media (min-width:768px) {
    /* font-size: 18px; */

    /* 버튼 */
    .enterbtn {
        padding: 20px 48px 20px 54px;
        gap: 16px;
    
        font-size: 24px;
    }
    
    .enter-icon {
        width: 24px;
        height: 24px;   
    }
    
    .callbtn {
        padding: 14px 24px;
        gap: 16px;
    
        font-size: 16px;
    }
    
    .call-icon {
        width: 16px;
        height: 16px;
    }

    /* 브레이크 포인트 */
    br.break-m {
        display: none;
    }
    
    br.break-t {
        display: inline;
    }

    /* 온라인초대장 디자인 */
    #intro {
        gap: 100px;

    }
    
    #intro-textbox {
        gap: 60px;
    }
    
    .intro-title {
        font-size: 48px;
    }
    
    .intro-content {
        font-size: 20px;
    }

    .popup {
        padding: 30px 50px 30px 30px;
        font-size: 18px;
    }


    /* detail은 시간 및 장소 등의 정보를 보여줍니다. */
    #detail {
        padding-bottom: 60px;
        gap: 134px;
    }

    .detail-left {
        padding-left: 110px;
        gap: 60px;
    }

    .detail-right {
        padding-right: 110px;
        gap: 60px;
    }

    .detail-title {
        gap: 14px;
        font-size: 24px;
    }

    .detail-content {
        font-size: 30px;
    }

    .arrow-to-right {
        width: 60px;
        height: 60px;
    }

    .arrow-to-left {
        width: 60px;
        height: 60px;
    }

    #map {
        height: 500px;  
    }

    .htc-textbox {
        /* position:absolute; */
        /* width: 100vw; */
        padding: 32px 28px;
        margin: 30px 25px;

        font-size: 18px;
    }

    .gap {
        padding-bottom: 34px;
    }

    .htc-content {
        padding-top: 4px;
        padding-left: 20px;
    }
}

/* Tablet Landscape - ml */
@media (min-width:1024px) {
    /* font-size: 20px; */
    
    /* 버튼 */
    .enterbtn {
        padding: 26px 68px 26px 74px;
        gap: 20px;
    
        font-size: 32px;
    }
    
    .enter-icon {
        width: 32px;
        height: 32px;   
    }
    
    .callbtn {
        padding: 18px 36px;
        gap: 20px;
    
        font-size: 20px;
    }
    
    .call-icon {
        width: 20px;
        height: 20px;
    }

    /* 온라인초대장 디자인 */
    #intro {
        gap: 100px;

    }
    
    #intro-textbox {
        gap: 70px;
    }
    
    .intro-title {
        font-size: 64px;
    }
    
    .intro-content {
        font-size: 24px;
    }

    .popup {
        padding: 36px 60px 36px 36px;
        font-size: 20px;
    }


    /* detail은 시간 및 장소 등의 정보를 보여줍니다. */
    #detail {
        padding-bottom: 80px;
        gap: 134px;
    }

    .detail-left {
        padding: 0;
        width: 1000px;
        gap: 90px;
    }
    
    .detail-right {
        padding: 0;
        width: 1000px;
        gap: 90px;
    }

    .detail-title {
        gap: 18px;
        font-size: 32px;
    }

    .detail-content {
        font-size: 40px;
    }

    .arrow-to-right {
        width: 70px;
        height: 70px;
    }

    .arrow-to-left {
        width: 70px;
        height: 70px;
    }

    #map {
        height: 700px;  
    }

    #htc-wrap {
        position: relative;
    }

    .htc-textbox {
        position:absolute;
        top: 50%;
        left: 52%;
        transform: translateY(-50%);
        padding: 36px 32px;

        font-size: 20px;
    }

    .gap {
        padding-bottom: 34px;
    }

    .htc-content {
        padding-top: 4px;
        padding-left: 24px;
    }


}