:root {
  --bg: #fafaf7;
  --fg: #222;
  --muted: #666;
  --accent: #335;
  --card-bg: #fff;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
  --shadow-hover: 0 4px 12px rgba(0,0,0,.15);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
               Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.4;
}

header {
  padding: 1.5rem 1rem 0.5rem;
  max-width: 1400px;
  margin: 0 auto;
}

h1 {
  margin: 0.25rem 0 1rem;
  font-size: 1.75rem;
}

main {
  padding: 0 1rem 3rem;
  max-width: 1400px;
  margin: 0 auto;
}

.back {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
}

.back:hover { text-decoration: underline; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border-radius: 6px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.card img, .card .no-cover {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  background: #ddd;
}

.card .caption {
  padding: .6rem .75rem .75rem;
  font-weight: 500;
}

.tile {
  display: block;
  background: var(--card-bg);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease;
}

.tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.tile img {
  width: 100%;
  height: auto;
  display: block;
}

.photo-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem 1rem;
  margin-bottom: 1rem;
}

.nav-pager {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.nav-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
  padding: .35rem .7rem;
  border-radius: 4px;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease;
  white-space: nowrap;
}

.nav-link:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
  text-decoration: none;
}

.nav-link.disabled {
  color: var(--muted);
  opacity: 0.4;
  box-shadow: none;
  cursor: default;
}

.nav-link.disabled:hover {
  transform: none;
  box-shadow: none;
}

.nav-counter {
  color: var(--muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  min-width: 5em;
  text-align: center;
}

.viewer {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.viewer img {
  max-width: 100%;
  max-height: calc(100vh - 180px);
  width: auto;
  height: auto;
  display: block;
  background: #222;
  border-radius: 4px;
  box-shadow: var(--shadow);
}

.viewer-meta {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.viewer-meta a { color: var(--accent); }

@media (max-width: 500px) {
  .grid, .photo-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: .5rem;
  }
  h1 { font-size: 1.4rem; }
  .photo-nav { flex-direction: column; align-items: stretch; }
  .nav-pager { justify-content: space-between; }
}