:root {
  --bg: #fafafa;
  --fg: #0b0b0c;
  --muted: #6b6b70;
  --line: #e4e4e7;
  --cell: #ececec;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0b0c;
    --fg: #f2f2f3;
    --muted: #9a9aa0;
    --line: #1f1f22;
    --cell: #161618;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.top {
  text-align: center;
  padding: 2.4rem 1rem 1.4rem;
}
.top h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: .02em;
}
.count {
  margin: .3rem 0 0;
  color: var(--muted);
  font-size: .82rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 3px 3px;
}
@media (min-width: 640px)  { .grid { grid-template-columns: repeat(4, 1fr); gap: 6px; padding: 0 6px 6px; } }
@media (min-width: 960px)  { .grid { grid-template-columns: repeat(5, 1fr); } }

.cell {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background-color: var(--cell);
  background-size: cover;
  background-position: center;
  border: 0;
  padding: 0;
  cursor: pointer;
  outline-offset: 2px;
}
.cell img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity .5s ease;
}
.cell img.loaded { opacity: 1; }
.cell::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0);
  transition: background .15s ease;
}
@media (hover: hover) {
  .cell:hover::after { background: rgba(0,0,0,.06); }
}

.empty { text-align: center; color: var(--muted); padding: 3rem 1rem; }

.foot {
  text-align: center;
  padding: 2rem 1rem 3rem;
  border-top: 1px solid var(--line);
  margin-top: 2rem;
}
.foot a { color: var(--muted); text-decoration: none; font-size: .82rem; }

/* lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(0,0,0,.92);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
  overscroll-behavior: contain;
}
.lb-fig {
  margin: 0;
  max-width: 100vw;
  max-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .7rem;
  padding: 3.2rem 1rem 1.4rem;
}
.lb-fig img {
  max-width: 100%;
  max-height: calc(100vh - 6rem);
  object-fit: contain;
  border-radius: 2px;
  background: #111;
}
.lb-fig figcaption {
  color: #e9e9ec;
  font-size: .9rem;
  text-align: center;
  max-width: 46rem;
  min-height: 1.2em;
}
.lb-btn {
  position: absolute;
  background: none;
  border: 0;
  color: #fff;
  cursor: pointer;
  opacity: .8;
  transition: opacity .15s ease;
  line-height: 1;
  -webkit-tap-highlight-color: transparent;
}
.lb-btn:hover { opacity: 1; }
.lb-close { top: .6rem; right: .9rem; font-size: 2.2rem; }
.lb-prev, .lb-next { top: 50%; transform: translateY(-50%); font-size: 3rem; padding: 1rem; }
.lb-prev { left: .2rem; }
.lb-next { right: .2rem; }
@media (max-width: 640px) {
  .lb-prev, .lb-next { font-size: 2.2rem; opacity: .55; }
}

body.no-scroll { overflow: hidden; }