/**
 * Left Panel Component Styles
 */

/* ===========================
   Icon Rail
   =========================== */

.icon-rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: var(--icon-rail-width);
  background-color: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

.icon-rail__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background-color: transparent;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.icon-rail__btn:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.icon-rail__btn--active {
  background-color: var(--color-accent);
  color: white;
}

.icon-rail__btn--active:hover {
  background-color: var(--color-accent-hover);
}

.icon-rail__btn--favorites[aria-pressed="true"] {
  color: var(--color-star-active);
}

.icon-rail__btn[data-action="toggle-panel"][aria-pressed="false"] {
  background-color: var(--color-bg-hover);
  color: var(--color-accent);
}

.icon-rail__btn svg {
  display: block;
}

/* ===========================
   Left Panel
   =========================== */

.left-panel {
  display: flex;
  flex-direction: column;
  width: var(--left-panel-width);
  background-color: var(--color-bg-primary);
  border-right: 1px solid var(--color-border);
  flex-shrink: 0;
  overflow: hidden;
}

.left-panel[data-open="false"] {
  display: none;
}

/* Header */
.left-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 40px;
  padding: 0 var(--spacing-md);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.left-panel__toggle {
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  cursor: pointer;
  text-decoration: none;
}

.left-panel__toggle:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

.left-panel__close {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  transition: all var(--transition-fast);
}

.left-panel__close:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text-primary);
}

/* Search Row */
.left-panel__search {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.left-panel__help {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.left-panel__help:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.left-panel__search-input {
  flex: 1;
  height: 28px;
  padding: 0 var(--spacing-sm);
  font-size: var(--font-size-sm);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
}

.left-panel__match-count {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Content Area */
.left-panel__content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

/* Loading Skeleton */
.tree-skeleton {
  padding: var(--spacing-sm) var(--spacing-md);
}

.tree-skeleton__node {
  height: 28px;
  margin-bottom: var(--spacing-xs);
  background: linear-gradient(
    90deg,
    var(--color-bg-secondary) 25%,
    var(--color-bg-tertiary) 50%,
    var(--color-bg-secondary) 75%
  );
  background-size: 200% 100%;
  border-radius: var(--radius-sm);
  animation: shimmer 1.5s infinite;
}

.tree-skeleton__node--level-1 {
  margin-left: 24px;
  width: calc(100% - 24px);
}

.tree-skeleton__node--level-2 {
  margin-left: 48px;
  width: calc(100% - 48px);
}

.tree-skeleton__node--short {
  width: 60%;
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* Empty States */
.left-panel__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-secondary);
  min-height: 200px;
}

.left-panel__empty-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.left-panel__empty-title {
  font-size: var(--font-size-md);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

.left-panel__empty-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* ===========================
   Tree View
   =========================== */

.tree-view {
  padding: var(--spacing-sm) 0;
}

.tree-node {
  position: relative;
}

.tree-node__content {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  min-height: 28px;
}

.tree-node__content:hover {
  background-color: var(--color-bg-hover);
}

.tree-node--selected .tree-node__content {
  background-color: var(--color-accent);
  color: white;
}

.tree-node--selected .tree-node__content:hover {
  background-color: var(--color-accent-hover);
}

.tree-node--highlighted .tree-node__content {
  background-color: rgba(255, 193, 7, 0.1);
  animation: highlight-pulse 1s ease-in-out 2;
}

@keyframes highlight-pulse {
  0%, 100% {
    background-color: rgba(255, 193, 7, 0.1);
  }
  50% {
    background-color: rgba(255, 193, 7, 0.3);
  }
}

/* Indentation for nested levels */
.tree-node--level-1 .tree-node__content {
  padding-left: calc(var(--spacing-md) + 20px);
}

.tree-node--level-2 .tree-node__content {
  padding-left: calc(var(--spacing-md) + 40px);
}

.tree-node--level-3 .tree-node__content {
  padding-left: calc(var(--spacing-md) + 60px);
}

/* Arrow icon for folders */
.tree-node__arrow {
  flex-shrink: 0;
  transition: transform var(--transition-fast);
  color: var(--color-text-secondary);
}

.tree-node--expanded .tree-node__arrow {
  transform: rotate(90deg);
}

.tree-node--file .tree-node__arrow {
  visibility: hidden;
}

/* Icons */
.tree-node__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: block;
  object-fit: contain;
}

/* Icon color theming - SVG icons inherit currentColor */
.tree-node__icon {
  color: var(--color-text-secondary);
}

.tree-node--selected .tree-node__icon {
  color: white;
  /* For img elements, apply filter to make them white when selected */
  filter: brightness(0) invert(1);
}

.tree-node__icon--file {
  opacity: 0.8;
}

/* Label */
.tree-node__label {
  flex: 1;
  font-size: var(--font-size-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Children container */
.tree-node__children {
  display: block;
}

.tree-node__children--collapsed {
  display: none;
}

.tree-node--folder:not(.tree-node--expanded) > .tree-node__children {
  display: none;
}

/* Badge (child count) */
.tree-node__badge {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-lg);
  padding: 2px 6px;
  flex-shrink: 0;
}

.tree-node--selected .tree-node__badge {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
}

/* Star button */
.tree-node__star {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-sm);
  color: var(--color-text-tertiary);
  flex-shrink: 0;
  opacity: 0;
  transition: all var(--transition-fast);
}

.tree-node__content:hover .tree-node__star {
  opacity: 1;
}

.tree-node__star--active {
  opacity: 1 !important;
  color: var(--color-star-active);
}

.tree-node__star:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-star-hover);
}

.tree-node--selected .tree-node__star {
  color: rgba(255, 255, 255, 0.7);
}

.tree-node--selected .tree-node__star--active {
  color: var(--color-star-active);
}

/* ===========================
   Thumbnail View
   =========================== */

.thumbnail-view {
  padding: var(--spacing-md);
}

.thumbnail-folder {
  margin-bottom: var(--spacing-lg);
}

.thumbnail-folder__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  cursor: pointer;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: var(--spacing-md);
}

.thumbnail-folder__header:hover {
  color: var(--color-accent);
}

.thumbnail-folder__arrow {
  transition: transform var(--transition-fast);
  color: var(--color-text-secondary);
}

.thumbnail-folder--expanded .thumbnail-folder__arrow {
  transform: rotate(90deg);
}

.thumbnail-folder__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
}
.thumbnail-folder {
  margin-bottom: var(--spacing-lg);
}

.thumbnail-folder__header {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  padding: 0 var(--spacing-sm);
}
.thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--spacing-md);
}

.thumbnail-card {
  position: relative;
  cursor: pointer;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-bg-secondary);
  transition: all var(--transition-fast);
}

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

.thumbnail-card--selected {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.thumbnail-card__image {
  width: 100%;
  aspect-ratio: 11 / 8.5;  /* Standard plan/blueprint aspect ratio */
  object-fit: cover;
  background-color: var(--color-bg-tertiary);
  display: block;
}

.thumbnail-card__image--loading {
  background: linear-gradient(
    90deg,
    var(--color-bg-secondary) 25%,
    var(--color-bg-tertiary) 50%,
    var(--color-bg-secondary) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

.thumbnail-card__placeholder {
  width: 100%;
  aspect-ratio: 11 / 8.5;
  background-color: var(--color-bg-tertiary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.thumbnail-card__placeholder-icon {
  font-size: 48px;
  opacity: 0.3;
}

.thumbnail-card__placeholder-text {
  font-size: var(--font-size-sm);
  text-align: center;
  opacity: 0.7;
}

.thumbnail-card__label {
  padding: var(--spacing-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.thumbnail-card__star {
  position: absolute;
  top: var(--spacing-xs);
  right: var(--spacing-xs);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.5);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  opacity: 0;
}

.thumbnail-card:hover .thumbnail-card__star {
  opacity: 1;
}

.thumbnail-card__star--active {
  color: var(--color-accent);
  opacity: 1 !important;
}

.thumbnail-card__star:hover {
  background-color: rgba(0, 0, 0, 0.7);
  color: var(--color-accent-hover);

  aspect-ratio: 1;
  object-fit: cover;
  background-color: var(--color-bg-tertiary);
  display: block;
}

.thumbnail-card__label {
  padding: var(--spacing-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: center;
}

.thumbnail-card__star {
  position: absolute;
  top: var(--spacing-xs);
  right: var(--spacing-xs);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.6);
  border-radius: var(--radius-sm);
  color: var(--color-text-tertiary);
  opacity: 0;
  transition: all var(--transition-fast);
}

.thumbnail-card:hover .thumbnail-card__star {
  opacity: 1;
}

.thumbnail-card__star--active {
  opacity: 1 !important;
  color: var(--color-star-active);
}

.thumbnail-card__star:hover {
  background-color: rgba(0, 0, 0, 0.8);
  color: var(--color-star-hover);
}

/* ===========================
   Resize Handle
   =========================== */

.resize-handle {
  width: var(--resize-handle-width);
  background-color: transparent;
  cursor: col-resize;
  position: relative;
  flex-shrink: 0;
}

.resize-handle:hover,
.resize-handle.dragging {
  background-color: var(--color-accent);
}

.resize-handle::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: -4px;
  right: -4px;
}