*{
margin:0;
padding:0;
box-sizing:border-box;
}

body{
font-family:'Noto Sans KR',sans-serif;
background:#0b0b0b;
color:#fff;
}

/* header */

header{
position:sticky;
top:0;
background:#0b0b0b;
z-index:10;
border-bottom:1px solid rgba(255,255,255,0.08);
padding:18px 30px;
display:flex;
justify-content:space-between;
align-items:center;
}

.logo{
font-size:22px;
letter-spacing:6px;
font-weight:700;
}

.sub{
font-size:12px;
letter-spacing:3px;
opacity:0.6;
}

/* container */

.container{
max-width:1600px;
margin:auto;
padding:40px 30px;
}

/* gallery */

.gallery{
columns:5 240px;
column-gap:18px;
}

.item{
position:relative;
margin-bottom:18px;
overflow:hidden;
border-radius:10px;
cursor:pointer;
transform:translateY(40px);
opacity:0;
transition:all 0.6s;
}

.item.show{
transform:translateY(0);
opacity:1;
}

.item img{
width:100%;
display:block;
transition:transform .7s, filter .7s;
}

/* hover */

.item:hover img{
transform:scale(1.12);
}

.overlay{
position:absolute;
bottom:0;
left:0;
width:100%;
padding:14px;
background:linear-gradient(transparent,rgba(0,0,0,0.85));
opacity:0;
transition:0.4s;
font-size:13px;
letter-spacing:2px;
}

.item:hover .overlay{
opacity:1;
}

.item:hover{
box-shadow:0 15px 40px rgba(0,0,0,0.7);
}

/* idle highlight effect */

.highlight img{
animation:glowEffect 2.2s ease;
}

@keyframes glowEffect{

0%{
transform:scale(1);
filter:brightness(1);
}

50%{
transform:scale(1.06);
filter:brightness(1.35);
}

100%{
transform:scale(1);
filter:brightness(1);
}

}

/* lightbox */

#lightbox{
position:fixed;
top:0;
left:0;
width:100%;
height:100%;
background:rgba(0,0,0,0.95);
display:flex;
justify-content:center;
align-items:center;
opacity:0;
pointer-events:none;
transition:0.4s;
z-index:100;
}

#lightbox.active{
opacity:1;
pointer-events:auto;
}

#lightbox img{
max-width:90%;
max-height:90%;
transform:scale(0.85);
transition:0.4s;
}

#lightbox.active img{
transform:scale(1);
}

.close{
position:absolute;
top:25px;
right:40px;
font-size:40px;
cursor:pointer;
}

/* footer */

footer{
text-align:center;
padding:40px;
opacity:0.5;
font-size:12px;
letter-spacing:2px;
}

/* mobile */

@media(max-width:900px){

.gallery{
columns:2 180px;
}

header{
flex-direction:column;
gap:4px;
}

}