/* ==========================================================================
   Desktop Layout - Two-column layout for screens >= 900px
   ========================================================================== */

/* App Layout Structure */
body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}

#app-header {
  background-color: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-left {
  display: flex;
  align-items: center;
}

#app-header h1 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin: 0;
  color: var(--color-primary);
}

/* Hide mobile elements on desktop */
.mobile-overlay {
  display: none;
}

#app-container {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: var(--space-6);
  padding: var(--space-6);
  min-height: 0; /* Allow panels to shrink */
}

#book-manager {
  min-width: 280px;
  max-width: 400px;
  position: static;
  transform: none;
  padding-top: 0;
  height: auto;
  width: auto;
  background-color: transparent;
  z-index: auto;
}

/* Reset any mobile navigation states on desktop */
body.mobile-nav-open #book-manager {
  transform: none;
  position: static;
}

body.mobile-nav-open .mobile-overlay {
  display: none;
}

#editor-panel {
  min-width: 0; /* Allow content to shrink */
  display: flex;
  flex-direction: column;
}

#editor-content {
  flex: 1;
  min-height: 0;
  height:100%;
  overflow: auto;
}

#status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-6);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* Panel Sizing for Desktop */
.panel-content {
  max-height: calc(100vh - 200px);
}

/* Tree Indentation for Desktop */
.tree-item[data-depth="1"] { padding-left: calc(var(--space-3) + 1.5rem); }
.tree-item[data-depth="2"] { padding-left: calc(var(--space-3) + 3rem); }
.tree-item[data-depth="3"] { padding-left: calc(var(--space-3) + 4.5rem); }

/* Hover States for Desktop */
.tree-item .tree-tools {
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.tree-item:hover .tree-tools {
  opacity: 1;
}

/* Drag and Drop for Desktop */
.drag-handle {
  cursor: grab;
  color: var(--color-text-muted);
  padding: var(--space-1);
}

.drag-handle:hover {
  color: var(--color-text-secondary);
}

.drag-handle:active {
  cursor: grabbing;
}

.sortable-ghost {
  opacity: 0.4;
}

.sortable-chosen {
  background-color: var(--color-primary);
  color: white;
}

.drop-zone-active {
  background-color: rgba(37, 99, 235, 0.1);
  border: 2px dashed var(--color-primary);
}

.drop-zone-invalid {
  background-color: rgba(220, 38, 38, 0.1);
  border: 2px dashed var(--color-error);
}

/* Resizable Panels */
.panel-resizer {
  width: 4px;
  background-color: var(--color-border);
  cursor: col-resize;
  transition: background-color var(--transition-fast);
}

.panel-resizer:hover {
  background-color: var(--color-primary);
}

/* Context Menus */
.context-menu {
  position: absolute;
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  min-width: 150px;
  z-index: 1000;
}

.context-menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-base);
  cursor: pointer;
  font-size: var(--font-size-sm);
  transition: background-color var(--transition-fast);
}

.context-menu-item:hover {
  background-color: var(--color-surface);
}

.context-menu-separator {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-2) 0;
}

/* Editor Specific Layouts */
.chart-editor {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: var(--space-6);
  height: 100%;
}

.chart-container {
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.data-editor {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

/* Stats Display */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.stat-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  text-align: center;
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

/* Form Layouts */
.form-grid {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-3);
  align-items: center;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

/* Responsive Adjustments for Large Screens */
@media (min-width: 1200px) {
  #app-container {
    grid-template-columns: 380px 1fr;
    gap: var(--space-8);
    padding: var(--space-8);
  }
  
  .panel-content {
    padding: var(--space-8);
  }
}

@media (min-width: 1600px) {
  #app-container {
    grid-template-columns: 420px 1fr;
    max-width: 1800px;
    margin: 0 auto;
  }
}