:root {
  color-scheme: light dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "PingFang SC", sans-serif;
}

header {
  position: sticky;
  top: 0;
  background: canvas;
  padding: 0.5rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  z-index: 10;
  border-bottom: 1px solid #8884;
}

#tabs {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.tab {
  padding: 0.4rem 0.8rem;
  border: 1px solid #8884;
  border-radius: 999px;
  background: none;
  cursor: pointer;
  font-size: 0.9rem;
}

.tab.active {
  background: #4a90d9;
  color: white;
  border-color: #4a90d9;
}

#search-input {
  flex: 1 1 200px;
  padding: 0.4rem 0.6rem;
  border-radius: 8px;
  border: 1px solid #8884;
  font-size: 0.9rem;
}

#grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
  padding: 1rem;
}

#grid.empty::before {
  content: attr(data-empty-message);
  grid-column: 1 / -1;
  text-align: center;
  opacity: 0.6;
  padding: 2rem 0;
}

.card {
  cursor: pointer;
  border-radius: 8px;
  overflow: hidden;
  background: #8881;
  display: flex;
  flex-direction: column;
}

.card-thumb {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  background: #8882;
}

.card-thumb.placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.card-title {
  padding: 0.4rem;
  font-size: 0.85rem;
  text-align: center;
  word-break: break-word;
}

#viewer {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  touch-action: pan-y pinch-zoom;
}

#viewer[hidden] {
  display: none;
}

#viewer-stage {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#viewer-stage img,
#viewer-stage iframe {
  max-width: 100%;
  max-height: 100%;
  width: 100%;
  height: 100%;
  object-fit: contain;
  border: none;
}

#viewer-close,
#viewer-prev,
#viewer-next {
  position: absolute;
  background: rgba(255, 255, 255, 0.15);
  color: white;
  border: none;
  font-size: 1.8rem;
  cursor: pointer;
  padding: 0.5rem 1rem;
  border-radius: 8px;
}

#viewer-close {
  top: 1rem;
  right: 1rem;
}

#viewer-prev {
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
}

#viewer-next {
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
}

#viewer-counter {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  color: white;
  background: rgba(255, 255, 255, 0.15);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.85rem;
}

#viewer-counter:empty,
#viewer-prev:disabled,
#viewer-next:disabled {
  display: none;
}