:root{
  --bg:#3f474f;          /* Pixieset demo vibe */
  --bg2:#3a424a;
  --text:#e9edf2;
  --muted: rgba(233,237,242,.75);
  --muted2: rgba(233,237,242,.55);
  --max: 1400px;

  --gap: 18px;
  --tileRadius: 2px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background: var(--bg);
  color: var(--text);
}

/* Top bar */
header{
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(63,71,79,.86);
  backdrop-filter: blur(10px);
}
.nav{
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 20px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.brand{
  font-size: 14px;
  letter-spacing: .02em;
  color: var(--text);
}
.links{
  display:flex;
  gap: 22px;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.links a{
  color: var(--muted);
  text-decoration:none;
}
.links a:hover{ color: var(--text); }

/* Layout */
main{
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 20px 52px;
}

/* Gallery grid */
.grid{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}
@media (max-width: 1100px){ .grid{ grid-template-columns: repeat(3, 1fr);} }
@media (max-width: 820px){ .grid{ grid-template-columns: repeat(2, 1fr);} }
@media (max-width: 520px){ .grid{ grid-template-columns: 1fr;} }

/* Tile */
.tile{
  margin:0;
}
.tile img{
  width:100%;
  height: 520px;            /* portrait feel */
  object-fit: cover;
  display:block;
  border-radius: var(--tileRadius);
  background: rgba(255,255,255,.08);
  cursor: zoom-in;
  transform: translateZ(0);
  transition: filter .18s ease, transform .18s ease;
}
.tile img{
  transition: transform .22s ease, filter .22s ease;
}

.tile img:hover{
  transform: translateY(-2px);
  filter: contrast(1.02) saturate(1.03);
}

/* Prompt under each image (subtle) */
.caption{
  display:none;
  color: var(--muted2);
  font-size: 12px;
  line-height: 1.45;
  white-space: pre-wrap;
}

/* Footer */
footer{
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 20px 22px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  color: var(--muted2);
  font-size: 12px;
}
.social{
  display:flex;
  gap: 12px;
  align-items:center;
}
.social a{
  color: var(--muted2);
  text-decoration:none;
  font-size: 12px;
}
.social a:hover{ color: var(--text); }

/* Lightbox */
.lightbox{
  position: fixed;
  inset: 0;
  display:none;
  place-items:center;
  background: rgba(35,40,46,.72);
  backdrop-filter: blur(6px);
  z-index: 999;
  padding: 18px;
}
.lightbox.open{ display:grid; }

.lightbox-inner{
  width: min(1220px, 100%);
}
.lightbox-img{
  width:100%;
  max-height: 78vh;
  object-fit: contain;
  display:block;
  border-radius: 2px;
}
.lightbox-bar{
  margin-top: 12px;
  display:flex;
  gap: 12px;
  align-items:flex-start;
  justify-content:space-between;
}
.lightbox-prompt{
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
  white-space: pre-wrap;
  flex: 1;
}
.actions{
  display:flex;
  gap: 10px;
}
.btn{
  background: transparent;
  border: 1px solid rgba(233,237,242,.35);
  color: rgba(233,237,242,.9);
  border-radius: 999px;
  padding: 9px 12px;
  font-size: 12px;
  cursor:pointer;
}
.btn:hover{
  border-color: rgba(233,237,242,.55);
}
.lb-arrow{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 54px;
  height: 54px;
  border-radius: 999px;
  border: 1px solid rgba(233,237,242,.35);
  background: rgba(63,71,79,.35);
  color: rgba(233,237,242,.95);
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  z-index: 1000;
  user-select: none;
}

.lb-arrow:hover{
  border-color: rgba(233,237,242,.55);
  background: rgba(63,71,79,.55);
}

.lb-prev{ left: 22px; }
.lb-next{ right: 22px; }

@media (max-width: 700px){
  .lb-arrow{
    width: 46px;
    height: 46px;
    font-size: 24px;
  }
  .lb-prev{ left: 12px; }
  .lb-next{ right: 12px; }
}