/* ============================================================
   LEFT PANEL — SORT & TAG CONTROLS
   ============================================================ */
.library-controls {
  padding: 0.4rem 0.65rem;
  display: flex;
  gap: 0.35rem;
  align-items: center;
  border-bottom: 1px solid var(--surface-border);
}
.library-controls select {
  flex: 1;
  background: var(--bg-surface) !important;
  border: 1px solid var(--surface-border) !important;
  color: var(--text-secondary) !important;
  font-size: 0.72rem !important;
  border-radius: var(--radius-sm) !important;
  padding: 0.25rem 0.4rem !important;
}
.library-controls select:focus {
  border-color: var(--border-accent) !important;
}
.library-controls .btn {
  padding: 0.2rem 0.4rem;
  font-size: 0.72rem;
}

.tag-cloud-wrap {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 0.65rem;
  border-bottom: 1px solid var(--surface-border);
}
.tag-cloud-wrap.open {
  max-height: 200px;
  padding: 0.4rem 0.65rem;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.15rem 0.5rem;
  font-size: 0.68rem;
  font-family: inherit;
  line-height: 1.5;
  border-radius: 100px;
  border: 1px solid var(--surface-border);
  background: var(--bg-surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}
.tag-chip:hover {
  border-color: var(--purple-500);
  color: var(--text-accent);
  background: rgba(145, 71, 255, 0.1);
}
.tag-chip.active {
  background: var(--purple-600);
  border-color: var(--purple-600);
  color: #fff;
}
.tag-chip .tag-count {
  opacity: 0.6;
  font-size: 0.6rem;
}
.tag-chip:focus-visible {
  outline: 2px solid var(--purple-500);
  outline-offset: 2px;
}

/* ============================================================
   DROP ZONE
   ============================================================ */
.drop-zone {
  margin: 0.65rem;
  padding: 1.5rem 1rem;
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-md);
  text-align: center;
  transition: all var(--transition-normal);
  cursor: pointer;
  background: var(--bg-surface);
  position: relative;
  overflow: hidden;
}
.drop-zone::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: var(--radius-md);
  padding: 2px;
  background: linear-gradient(60deg, var(--purple-600), var(--magenta-600), var(--purple-600));
  background-size: 300% 300%;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--transition-normal);
  animation: border-flow 3s ease infinite;
}
.drop-zone:hover, .drop-zone.drag-over {
  border-color: transparent;
  background: var(--bg-elevated);
  box-shadow: inset 0 0 30px var(--purple-glow), 0 0 20px var(--purple-glow);
  transform: translateY(-2px);
}
.drop-zone:hover::before, .drop-zone.drag-over::before { opacity: 1; }
.drop-zone.drag-over .drop-icon {
  color: var(--purple-500);
  transform: scale(1.15);
}
.drop-icon {
  font-size: 2.2rem;
  color: var(--text-muted);
  transition: all var(--transition-normal);
}
.drop-text {
  font-weight: 600;
  margin: 0.35rem 0 0;
  color: var(--text-primary);
}
.drop-subtext {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin: 0.15rem 0 0;
}

/* ============================================================
   CARD LIST — Enhanced with 3D tilt
   ============================================================ */
.card-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.35rem 0.5rem;
}

.card-list-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: 0.15rem;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
}
.card-list-item::before {
  content: '';
  position: absolute;
  inset-inline-start: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--purple-500), var(--magenta-500));
  opacity: 0;
  transition: opacity var(--transition-fast);
  border-start-start-radius: 2px;
  border-end-start-radius: 2px;
}
.card-list-item::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-sm);
  opacity: 0;
  transition: opacity var(--transition-fast);
  background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--purple-glow) 0%, transparent 70%);
  pointer-events: none;
}
.card-list-item:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-default);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3), 0 0 16px var(--purple-glow);
}
.card-list-item:hover::before { opacity: 1; }
.card-list-item:hover::after { opacity: 1; }
.card-list-item.active {
  background: var(--bg-elevated);
  border-color: var(--border-accent);
  box-shadow: 0 0 12px var(--purple-glow);
  animation: pulse-glow 2s ease-in-out infinite;
}
.card-list-item.active::before { opacity: 1; }

.card-list-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--surface-border);
  transition: all var(--transition-fast);
}
.card-list-item:hover .card-list-avatar {
  border-color: var(--purple-500);
  box-shadow: 0 0 10px var(--purple-glow);
  transform: scale(1.08);
}
.card-list-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-fast);
}
.card-list-item:hover .card-list-avatar img { transform: scale(1.1); }
.card-list-avatar i {
  font-size: 1rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}
.card-list-item:hover .card-list-avatar i { color: var(--purple-400); }

.card-list-info {
  flex: 1;
  min-width: 0;
}
.card-list-name {
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}
.card-list-meta {
  font-size: 0.68rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-wrap: nowrap;
  overflow: hidden;
}
.card-list-meta .meta-filesize {
  opacity: 0.5;
  font-family: var(--font-mono);
  font-size: 0.6rem;
}

/* Full-text search result: which field matched, and the surrounding text. */
.card-list-match {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin-top: 0.15rem;
  font-size: 0.66rem;
  color: var(--text-muted);
  min-width: 0;
}
.card-list-match .card-match-field {
  flex: 0 0 auto;
  padding: 0 0.3rem;
  border-radius: 0.4rem;
  background: color-mix(in srgb, var(--purple-500) 22%, transparent);
  color: var(--text);
  font-size: 0.58rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.card-list-match .card-match-snippet {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.card-list-match mark {
  background: color-mix(in srgb, var(--purple-500) 45%, transparent);
  color: inherit;
  padding: 0 0.1rem;
  border-radius: 0.15rem;
}

/* Notice shown when a query has more matches than the list renders. */
.search-notice {
  padding: 0.3rem 0.5rem;
  margin-bottom: 0.35rem;
  font-size: 0.66rem;
  color: var(--text-muted);
  border: 1px dashed color-mix(in srgb, var(--purple-500) 40%, transparent);
  border-radius: 0.4rem;
  text-align: center;
}

.card-list-badge {
  font-size: 0.65rem;
  padding: 0.15em 0.45em;
  border-radius: 100px;
  white-space: nowrap;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  color: var(--text-muted);
  flex: 1;
}
.empty-state i { font-size: 2.5rem; margin-bottom: 0.5rem; }
.empty-state p { margin: 0; font-weight: 500; }
.empty-state small { font-size: 0.75rem; }

/* Batch / drag / tooltip */
.card-list-item.batch-selected { outline: 2px solid var(--purple-500); outline-offset: -2px; }
.card-batch-check { position: absolute; top: 8px; inset-inline-end: 8px; z-index: 5; width: 16px; height: 16px; accent-color: var(--purple-500); cursor: pointer; opacity: 0; transition: opacity var(--transition-fast); }
.card-list-item:hover .card-batch-check { opacity: 1; }
.card-batch-check:checked { opacity: 1; }
.card-drag-handle { cursor: grab; color: var(--text-muted); font-size: 0.8rem; padding: 2px 4px; opacity: 0; transition: opacity var(--transition-fast); }
.card-list-item:hover .card-drag-handle { opacity: 1; }
/* The handle starts invisible and only appears on hover, so a keyboard user
   tabbing onto it must be able to see it. */
.card-drag-handle:focus-visible { opacity: 1; outline: 2px solid var(--purple-500); outline-offset: 1px; border-radius: 3px; }
.card-list-item.drag-over { border-top: 2px solid var(--purple-500); transition: border-top 150ms ease, transform 150ms ease; }
.card-preview-tooltip {
  display: none; position: absolute; inset-inline-start: 105%; top: 0; width: 260px;
  background: var(--bg-secondary); border: 1px solid var(--surface-border);
  border-radius: 8px; padding: 12px; z-index: 100; box-shadow: 0 8px 24px rgba(0,0,0,.5);
  pointer-events: none; max-height: 300px; overflow-y: auto;
}
.card-list-item:hover .card-preview-tooltip { display: block; }
.card-preview-tooltip .preview-avatar { width: 48px; height: 48px; border-radius: 8px; object-fit: cover; }
.card-preview-tooltip .preview-desc { font-size: 0.75rem; color: var(--text-secondary); margin-top: 6px; display: -webkit-box; -webkit-line-clamp: 5; -webkit-box-orient: vertical; overflow: hidden; }

/* Mini-preview eye button (sits above the batch checkbox) */
.card-preview-btn {
  position: absolute; top: 34px; inset-inline-end: 8px; z-index: 5;
  width: 22px; height: 22px; padding: 0;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--surface-border); border-radius: 6px;
  background: var(--bg-surface); color: var(--text-muted);
  font-size: 0.72rem; cursor: pointer; line-height: 1;
  opacity: 0; transition: opacity var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}
.card-list-item:hover .card-preview-btn { opacity: 1; }
.card-preview-btn:hover { color: var(--text-accent); border-color: var(--purple-500); }
.card-preview-btn:focus-visible { opacity: 1; outline: 2px solid var(--purple-500); outline-offset: 1px; }

/* ============================================================
   NO CARD SELECTED
   ============================================================ */
.no-card-selected {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  padding: 2rem;
}
.no-card-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  border: 2px dashed var(--border-default);
}
.no-card-icon i {
  font-size: 2.2rem;
  color: var(--text-muted);
}
.no-card-selected h3 {
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}
.no-card-selected p {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* ── Large-library UX: glued first-letter group headers + #tag chip strip ── */
.card-group-header {
  position: sticky;
  top: 0;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  width: 100%;
  padding: 0.25rem 0.6rem;
  background-color: color-mix(in srgb, var(--bg-primary) 88%, transparent);
  border: none;
  cursor: pointer;
  backdrop-filter: blur(4px);
  border-block-end: 1px solid var(--border-subtle);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-accent);
}
.card-group-letter { font-weight: 800; }
.card-group-count { margin-left: auto; font-size: 0.62rem; opacity: 0.7; }
.card-group-body.collapsed { display: none; }
@media (prefers-reduced-motion: reduce) { .card-group-header { backdrop-filter: none; } }

.tag-chip-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  padding: 0.35rem 0.75rem;
}
.tag-chip-strip-chip {
  border: 1px solid var(--border-default);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: 12px;
  padding: 0.05rem 0.5rem;
  font-size: 0.7rem;
  cursor: pointer;
}
.tag-chip-strip-chip.active {
  border-color: var(--border-accent);
  background: var(--purple-glow);
  color: var(--text-primary);
}
.tag-chip-strip-clear {
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 0.1rem;
}