:root {
  color-scheme: light;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --line: #e6e6ea;
  --fill: #f5f5f7;
  --blue: #0071e3;
  --card: #e8e8ed;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: #fff;
  color: var(--ink);
  font: 16px/1.4 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, .btn, input {
  font: inherit;
}

button, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid #d2d2d7;
  border-radius: 999px;
  background: #fff;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

button.primary, .btn.primary {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

button:disabled {
  opacity: 0.45;
  cursor: default;
}

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  padding: 14px 20px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.titles { flex: 1 1 180px; min-width: 0; }

.titles h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.titles p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.tools {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

input[type="search"] {
  min-width: min(280px, 70vw);
  padding: 8px 14px;
  border: 1px solid #d2d2d7;
  border-radius: 999px;
  background: var(--fill);
  color: inherit;
}

main { padding: 12px 20px 96px; }

main.bleed { padding-left: 2px; padding-right: 2px; }

.shelf {
  margin: 22px 0 12px;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 22px 14px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  text-align: left;
  cursor: pointer;
  color: inherit;
  border-radius: 12px;
}

.card .cover {
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 12px;
  background: var(--card);
}

.card img, .tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card strong { font-size: 15px; font-weight: 600; }

.card span, .empty { color: var(--muted); font-size: 13px; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}

.tile {
  position: relative;
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  background: var(--card);
  overflow: hidden;
  cursor: pointer;
}

.tile .mark {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: rgba(0, 0, 0, 0.35);
  color: transparent;
  font-size: 16px;
  line-height: 22px;
  text-align: center;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
}

.tile.selected .mark {
  background: var(--blue);
  color: #fff;
}

.tile .album-label {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px 6px 5px;
  font-size: 11px;
  color: #fff;
  text-align: left;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.6));
}

.empty { padding: 32px 4px; }

#selectbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: rgba(255, 255, 255, 0.96);
  border-top: 1px solid #d2d2d7;
}

#selectbar[hidden], #viewer[hidden], [hidden] { display: none !important; }

#viewer {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  flex-direction: column;
  background: #111;
  color: #fff;
}

.viewer-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
}

.viewer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-left: auto;
  justify-content: flex-end;
}

#viewer button, #viewer .btn {
  background: rgba(255, 255, 255, 0.12);
  border-color: transparent;
  color: #fff;
}

#viewer-count { font-size: 14px; color: #ddd; }

.viewer-frame {
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
}

#viewer-stage {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#viewer-stage img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
}

#viewer-stage.zoomed {
  display: block;
  overflow: auto;
  cursor: grab;
}

#viewer-stage.zoomed img {
  max-width: none;
  max-height: none;
  width: 180%;
}

#viewer-prev, #viewer-next {
  position: absolute;
  top: 50%;
  z-index: 2;
  width: 48px;
  height: 64px;
  transform: translateY(-50%);
  border-radius: 999px;
  font-size: 36px;
  line-height: 1;
  background: rgba(0, 0, 0, 0.35) !important;
}

#viewer-prev { left: 8px; }
#viewer-next { right: 8px; }

#viewer-caption {
  margin: 0;
  min-height: 28px;
  padding: 8px 16px calc(14px + env(safe-area-inset-bottom));
  text-align: center;
  color: #e8e8ed;
}

body.viewer-open { overflow: hidden; }

@media (min-width: 700px) {
  .grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}

@media (max-width: 600px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .top { padding: 12px; }
  main { padding: 8px 12px 96px; }
  .viewer-actions button, .viewer-actions .btn { padding-inline: 10px; }
}