*{
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    box-sizing: border-box;
}

html {
    overflow-y: scroll;
    scroll-behavior: smooth;
}

body{
    background: #fff;
    color: #121212;
}

.container{
    padding: 24px 5%;
}

.container.contents{
    margin: 0 12%;
    padding: 96px 0;
}

.container.contents.no-bot-pad{
    padding-bottom: 0;
}

.container.contents.narrow-pad{
    padding: 16px 0;
}

.container.bottom{
    padding: 0 3% 48px;
}

::selection{
    background-color: #121212;
    color: #fff;
}

/* ---------------font----------------- */

a{
    color: #121212;
    text-decoration: none;
    position: relative;
}

.title{
    color: #121212;
    font-size: 48px;
    line-height: 130%;
    padding-bottom: 8px;
    font-weight: bold;
}

.sub-title{
    color: #121212;
    font-size: 36px;
    line-height: 130%;
    padding-bottom: 8px;
    font-weight: bold;
}

.sub-sub-title{
    color: #121212;
    font-size: 24px;
    line-height: 130%;
    font-weight: bold;
}

.sub-sub-title-small{
    color: #121212;
    font-size: 20px;
    line-height: 130%;
    font-weight: bold;
}

.sub-sub-sub-title{
    color: #121212;
    font-size: 16px;
    font-weight: bold;
    line-height: 150%;
}

.text{
    color: #121212;
    font-size: 16px;
    line-height: 150%;
}

.text.link{
    text-decoration: underline;
}

.text.line{
    margin: 0 4px;
}

.notation{
    color: gray;
    font-size: 14px;
    line-height: 150%;
}

.notation.line{
    margin: 0 4px;
}

/* ---------------header----------------- */

#header{
    width: 100%;
    border-bottom: 1.5px solid;
    position: sticky;
    top: 0;
    z-index: 999;
    background-color: #fff;
}

nav{
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

nav ul li{
    display: inline-block;
    list-style: none;
    margin: 0px 16px;
}

nav ul li a{
    position: relative;
}

nav ul li a::after{
    content: '';
    width: 0%;
    height: 1.5px;
    background: #121212;
    position: absolute;
    left: 0;
    bottom: -4px;
    transition: 0.4s;
}

nav ul li a:hover::after{
    width: 100%;
}

/* ---------------go-to-top----------------- */

#go-to-top{
    width: 100%;
    position: sticky;
    bottom: 0;
    z-index: 999;
    display: flex;
    justify-content: flex-end;
}

.button.btn5{
    display: inline-block;
    padding: 14px 16px;
    margin: 0;
    font-size: 12px;
}

/* ---------------intro----------------- */

#intro{
    width: 100%;
    height: 100vh;
    overflow: hidden;
    display: flex;
    /*----Vertical center----*/
    justify-content: center;
    /*----Horizontal center----*/
    padding-top: 24px;
    /* align-items: center;   */

}

.card-lists{
    display: flex;
}

.card-lists > div{
    margin: 0 16px;
}

.container-card{
    aspect-ratio: 3/4;
    width: 400px;
}

.card{
    height: 100%;
    width: 100%;
    position: relative;
    transition: transform 1s;
    transform-style: preserve-3d;
}

.container-card:hover > .card{
    transform: rotateY(180deg);
}

.card-front,.card-back{
    height: 100%;
    width: 100%;
    border-style: solid;
    border-width: 1.5px;
    position: absolute;
    backface-visibility: hidden;
}

.card-front{
    background-image: url("images/zodiac1.png");
    background-size: 80%;
    background-repeat: no-repeat;
    background-position: center;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}

.card-front span{
    text-align: center;
    margin-bottom: 16px;
}

.card-back{
    background-color: #fff;
    /* background-image: linear-gradient(120deg, #fbfcdb 0%, #e9defa 100%); */
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 32px;
}

/* ---------------about----------------- */

#about{
    width: 100%;
    border-top: 1.5px solid;
    padding: 24px 0;
}

#about-details{
    width: 100%;
    padding: 24px 0;
}

.row{
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.about-col-1{
    flex-basis: 40%;
    overflow: hidden;
}

.about-col-1.about-details{
    padding-top: 8px;
}

.about-col-2{
    flex-basis: 50%;
    margin-right: 5%;
    margin-top: 28px;
}

.about-col-2.about-details{
    margin-top: 0;
    padding-top: 8px;
    border-top: 1.5px solid;
}

.about-experience{
    margin-bottom: 16px;
}

.about-img{
    width: 100%;
    border: 1.5px solid;
    height: 620px;
    object-fit: cover;
    object-position: 50% 35%;
    box-shadow: 0 8px 8px rgba(0,0,0,0.1);
}

.about-img.img2{
    object-position: 50% 60%;
}

.tab-titles{
    display: flex;
    margin-top: 24px;
    margin-bottom: 18px;
}

.tab-links{
    margin-right: 32px;
    cursor: pointer;
    position: relative;
}

.tab-links::after{
    content: '';
    width: 0%;
    height: 1.5px;
    background: #121212;
    position: absolute;
    left: 0;
    bottom: -2px;
    transition: 0.4s;
}

.tab-links.active-link::after{
    width: 100%;
}

.tab-contents ul li{
    list-style: none;
    margin: 16px 0;
}

.tab-contents{
    display: none;
}

.tab-contents.active-tab{
    display: block;
}

.info-links{
    margin-bottom: 24px;
}

.info-links li{
    list-style: none;
}

.info-links li a{
    display: inline-block;
}

.info-links li i{
    margin-right: 16px;
}

.sns-links li{
    list-style: none;
    display: inline-block;
    margin-right: 14px;
}

.sns-links li i{
    font-size: 22px;
}

.lang-choices{
    float: right;
    display: flex;
}

.lang-links{
    margin-right: 8px;
    cursor: pointer;
}

.about-contents{
    display: none;
}

.about-contents.active-tab{
    display: block;
}

.about-contents-2{
    display: none;
}

.about-contents-2.active-tab{
    display: block;
}

.certificate-link{
    float: right;
    display: flex;
}

.skill-logo {
    position: relative;
    display: inline-block;
}
.skill-tag {
    visibility: hidden;
    opacity: 0;
    background: #222;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 4px 10px;
    position: absolute;
    left: 50%;
    bottom: 110%;
    transform: translateX(-50%);
    white-space: nowrap;
    z-index: 10;
    font-size: 13px;
    transition: opacity 0.2s;
    pointer-events: none;
}
.skill-logo:hover .skill-tag {
    visibility: visible;
    opacity: 1;
}

/* ---------------projects----------------- */

#projects{
    width: 100%;
    border-top: 1.5px solid;
}

#blog{
    width: 100%;
    border-top: 1.5px solid;
}

.projects-list{
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(250px,1fr));
    /* grid-template-columns: repeat(3,32%); */
    grid-gap: 28px;
    margin: 32px 0;
}

.projects-list.project-page{
    grid-gap: 16px;
    margin: 20px 0;
}

/* .projects-list img{
    -webkit-filter: grayscale(100%);
    filter: grayscale(100%);
}

.layer img{
    -webkit-filter: grayscale(0%);
    filter: grayscale(0%);
} */

.projects-list a{
    color: #121212;
    text-decoration: none;
}

.project{
    position: relative;
    overflow: hidden;
    aspect-ratio: 1/1;
    width: 100%;
    display: flex;
    justify-content: center;
    border: 1.5px solid;
}

.project img{
    height: 100%;
}

.layer{
    width: 100%;
    height: 0;
    background: rgba(255,255,255,0.7);
    position: absolute;
    left: 0;
    bottom: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 0 16px;
    text-align: center;
    transition: height 0.5s;
}

.project:hover .layer{
    height: 100%;
}

.button{
    display: block;
    margin: 36px auto 8px;
    width: fit-content;
    border: 1.5px solid #121212;
    padding: 16px 36px;
    font-size: 16px;
    font-weight: bold;
    color: #121212;
    text-decoration: none;
    background: #fff;
    transition: all 0.5s;
}

.button:hover{
    background-color: #121212;
    color: #fff;
}

.button.btn2{
    margin-top: 24px;
    display: inline-block;
}

.button.btn3{
    margin-top: 0px;
    cursor: pointer;
    margin-left: auto; 
    margin-right: 0;
}

.layer-img{
    margin-top: 20px;
}

.layer-img-container{
    width: 32px; 
    height: 32px; 
    display: inline-block;
}

.project-card{
    display: flex; 
    align-items: stretch; 
    margin-bottom: 32px; 
    background: #fff; 
    border: 1.5px solid;
    /* border-radius: 16px;  */
    overflow: hidden; 
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.project-card-img{
    flex: 1;
    min-width: 0;
}

.project-card-img img{
    width: 100%; 
    height: 100%; 
    object-fit: cover; 
    aspect-ratio: 4/3; 
    display: block;
}

.project-card-info{
    padding: 32px 0px 24px 32px; 
    flex: 1; 
    /* display: flex;  */
    flex-direction: column; 
    justify-content: space-between;
}

/* ---------------copyright----------------- */

#copyright{
    background: #121212;
    width: 100%;
    text-align: center;
    padding: 16px 0;
}

/* ---------------content----------------- */

#content{
    width: 100%;
}

.content-head{
    background-image: url("images/project1-cover.jpg");
    aspect-ratio: 2.1/1;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.content-left{
    padding-top: 32px;
    flex-basis: 70%;
}

.content-left p{
    padding-bottom: 16px;
}

.content-left h2{
    padding-top: 32px;
}

.content-left img{
    width: 100%;
    margin-bottom: 8px;
}

.content-right{
    padding-top: 32px;
    flex-basis: 25%;
}

.content-info-list{
    position: sticky;
    top: 96px;
    z-index: 100;
}

.content-info-list ul li{
    list-style: none;
    margin: 0 0 24px;
}

.button.btn4{
    display: inline-block;
    padding: 14px 16px;
    margin: 0;
    font-size: 12px;
}

.gallery{
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 5vw);
    grid-gap: 8px;
    margin-bottom: 8px;
}

.gallery-item img{
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gallery-item.item1{
    grid-column-start: 1;
    grid-column-end: 5;
    grid-row-start: 1;
    grid-row-end: 5;
}

.gallery-item.item2{
    grid-column-start: 5;
    grid-column-end: 9;
    grid-row-start: 1;
    grid-row-end: 5;
}

.gallery-item.item3{
    grid-column-start: 1;
    grid-column-end: 5;
    grid-row-start: 5;
    grid-row-end: 9;
}

.gallery-item.item4{
    grid-column-start: 5;
    grid-column-end: 9;
    grid-row-start: 5;
    grid-row-end: 9;
}

.gallery-item.item5{
    grid-column-start: 1;
    grid-column-end: 4;
    grid-row-start: 1;
    grid-row-end: 3;
}

.gallery-item.item6{
    grid-column-start: 4;
    grid-column-end: 7;
    grid-row-start: 1;
    grid-row-end: 3;
}

.gallery-item.item7{
    grid-column-start: 7;
    grid-column-end: 9;
    grid-row-start: 1;
    grid-row-end: 5;
}

.gallery-item.item8{
    grid-column-start: 1;
    grid-column-end: 4;
    grid-row-start: 3;
    grid-row-end: 5;
}

.gallery-item.item9{
    grid-column-start: 4;
    grid-column-end: 7;
    grid-row-start: 3;
    grid-row-end: 5;
}

.gallery.g2{
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(12, 4vw);
}

.gallery.g3{
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 4vw);
}

.gallery.g4{
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(4, 4vw);
}

.gallery-item.item10{
    grid-column-start: 5;
    grid-column-end: 9;
    grid-row-start: 1;
    grid-row-end: 3;
}

.gallery-item.item11{
    grid-column-start: 5;
    grid-column-end: 9;
    grid-row-start: 3;
    grid-row-end: 5;
}

.gallery-item.item12{
    grid-column-start: 5;
    grid-column-end: 7;
    grid-row-start: 5;
    grid-row-end: 9;
}

.gallery-item.item13{
    grid-column-start: 5;
    grid-column-end: 9;
    grid-row-start: 9;
    grid-row-end: 13;
}

.gallery-item.item14{
    grid-column-start: 7;
    grid-column-end: 9;
    grid-row-start: 5;
    grid-row-end: 9;
}

.gallery-item.item15{
    grid-column-start: 1;
    grid-column-end: 5;
    grid-row-start: 9;
    grid-row-end: 13;
}

.gallery-item.item16{
    grid-column-start: 5;
    grid-column-end: 9;
    grid-row-start: 9;
    grid-row-end: 13;
}

@media screen and (max-width: 600px) {
    .gallery-column {
      flex: 100%;
      max-width: 100%;
    }
}

.next-page{
    width: 100%;
    display: flex;
    justify-content: space-between;
    margin-top: 32px;
}

.former-page span{
    margin-left: 16px;
}

.later-page span{
    margin-right: 16px;
}

.row.image-container img{
    width: 22.5%;
    height: auto;
    margin-bottom: 16px;
}

.row.image-container.fan-handle{
    margin: 0 96px;
}

.row.image-container.fan-handle img{
    width: 7%;
}

.row.image-container.project10 img{
    width: 49%;
}

.contents-row{
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 16px;
}

.contents-col-left-left-align{
    flex-basis: 25%;
}

.contents-col-left-left-align img{
    max-width: 100%;
}

.contents-col-right-left-align{
    flex-basis: 50%;
    margin-right: 20%;
}

.contents-col-left-right-align{
    flex-basis: 50%;
    margin-left: 20%;
}

.contents-col-right-right-align{
    flex-basis: 25%;
}

.contents-col-right-right-align img{
    max-width: 100%;
}

/* ---------------video----------------- */
.ytb-video-container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
    margin-bottom: 16px;
}

.ytb-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* ---------------responsive design----------------- */
@media only screen and (max-width: 600px){
    #intro{
        padding-top: 0px;
        height: auto;
    }

    .container{
        padding: 14px 3%;
    }
    
    .container.contents{
        margin: 0 6%;
        padding: 36px 0;
    }

    .container-card{
        width: 320px;
    }
    
    .card-lists{
        display: block;
    }
    
    .card-lists > div{
        padding: 16px 0;
    }

    nav ul li{
        margin: 0px 8px;
    }

    .title{
        font-size: 30px;
    }
    
    .sub-title{
        font-size: 22px;
    }
    
    .sub-sub-title{
        font-size: 18px;
    }
    
    .sub-sub-title-small{
        font-size: 16px;
    }
    
    .sub-sub-sub-title{
        font-size: 14px;
    }
    
    .text{
        font-size: 14px;
    }

    .text.small{
        font-size: 12px;
    }
    
    .notation{
        font-size: 12px;
    }

    #about-details{
        padding: 4px 0 36px;
    }

    .about-col-1, .about-col-2{
        flex-basis: 100%;
    }

    .about-col-2{
        margin-right: 0;
    }

    .about-col-1.about-details{
        padding-top: 0;
    }

    .about-img{
        height: 400px;
    }
    
    #go-to-top{
        display: none;
    }

    .tab-titles{
        margin-bottom: 0;
    }

    .tab-links{
        margin-right: 16px;
    }

    .sub-sub-title.tab-link{
        font-size: 16px;
    }

    .fa-solid.fa-file{
        margin-right: 12px;
    }

    .content-left, .content-right{
        flex-basis: 100%;
    }
    
    .content-left p{
        padding-bottom: 8px;
    }
    
    .content-left h2{
        padding-top: 16px;
    }

    .row.image-container.fan-handle{
        margin: 0 16px;
    }

    .row.image-container.fan-handle img{
        width: 10%;
    }

    .contents-col-right-left-align{
        margin-right: 0;
    }

    .contents-col-left-left-align{
        flex-basis: 45%;
    }

    .contents-col-left-right-align{
        margin-left: 0;
    }

    .contents-col-right-right-align{
        flex-basis: 45%;
    }

    .content-head{
        aspect-ratio: 1/1;
    }

    .former-page span{
        margin-left: 2px;
    }
    
    .later-page span{
        margin-right: 2px;
    }

    .button.btn5{
        padding: 6px 8px;
    }

    .button.btn4{
        padding: 10px 12px;
    }
    
    .button.btn6{
        padding: 12px 20px;
    }

    .gallery{
        grid-template-rows: repeat(8, 9vw);
        grid-gap: 4px;
        margin-bottom: 4px;
    }

    .gallery.g2{
        grid-template-rows: repeat(12, 6vw);
    }
}