/* ==========================================================================
   Tablet/Mobile Layout - Single-column, touch-optimized for screens < 900px
   ========================================================================== */

/* App Layout Structure */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#app-header {
  background-color: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  position: relative;
  z-index: 30;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

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

/* Mobile Menu Button */
#mobile-menu-btn {
  font-size: var(--font-size-lg);
  color: var(--color-primary);
}

#app-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

/* Mobile Slide-Over Navigation */
#book-manager {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--color-background);
  transform: translateX(-100%);
  transition: transform var(--transition-base);
  z-index: 25;
  padding-top: 70px; /* Account for header height */
}

#book-manager.mobile-open {
  transform: translateX(0);
}

/* Mobile Overlay */
.mobile-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 20;
}

.mobile-overlay.visible {
  opacity: 1;
  visibility: visible;
}

#editor-panel {
  position: relative;
  width: 100%;
  height: 100%;
  background-color: var(--color-background);
  z-index: 10;
  display: flex;
  flex-direction: column;
}

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

/* Remove old states - using new mobile pattern */

/* Mobile Navigation States */
body.mobile-nav-open {
  overflow: hidden;
}

body.mobile-nav-open #book-manager {
  transform: translateX(0);
}

body.mobile-nav-open .mobile-overlay {
  opacity: 1;
  visibility: visible;
}

/* Mobile Tree Adjustments */
.tree-item {
  min-height: 28px;
}

.tree-item-content {
  padding: 2px var(--space-2);
}

/* Disable hover states on mobile to prevent conflicts */
@media (hover: none) {
  .tree-item:hover {
    background-color: transparent;
  }
  
  .tree-item.selected:hover {
    background-color: var(--color-primary-lighter) !important;
    color: var(--color-text-primary) !important;
  }
}

#status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* Navigation Controls */
.mobile-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-back-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: none;
  color: var(--color-primary);
  font-size: var(--font-size-base);
  cursor: pointer;
  border-radius: var(--radius-base);
  min-height: var(--touch-target-min);
}

.nav-back-btn:hover {
  background-color: var(--color-surface);
}

/* Touch-Optimized Tree */
.tree-item {
  padding: var(--space-4) var(--space-4);
  margin: var(--space-1) 0;
  min-height: var(--touch-target-min);
  font-size: var(--font-size-base);
}

.tree-item .icon {
  font-size: var(--font-size-lg);
  width: 2em;
}

/* Tree Indentation for Touch */
.tree-item[data-depth="1"] { padding-left: calc(var(--space-4) + 2rem); }
.tree-item[data-depth="2"] { padding-left: calc(var(--space-4) + 4rem); }
.tree-item[data-depth="3"] { padding-left: calc(var(--space-4) + 6rem); }

/* Touch-Optimized Tools */
.tree-tools {
  display: flex;
  gap: var(--space-2);
}

.tree-item .tree-tools {
  opacity: 1; /* Always visible on touch */
}

/* Drag Handles for Touch */
.drag-handle {
  font-size: var(--font-size-xl);
  padding: var(--space-2);
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  cursor: grab;
  color: var(--color-text-muted);
}

.drag-handle:active {
  cursor: grabbing;
  color: var(--color-text-primary);
}

/* Touch-Optimized Buttons */
.btn {
  min-height: var(--touch-target-min);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-base);
}

.btn-icon {
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  padding: var(--space-3);
  font-size: var(--font-size-xl);
}

/* Panel Headers for Touch */
.panel-header {
  padding: var(--space-4) var(--space-4);
}

.panel-header h2 {
  font-size: var(--font-size-xl);
}

.panel-content {
  padding: var(--space-4);
  height: calc(100vh - 140px); /* Account for header and footer */
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* Form Elements for Touch */
input,
select,
textarea {
  min-height: var(--touch-target-min);
  padding: var(--space-4);
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
}

/* Context Menus for Touch */
.context-menu {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
}

.context-menu-item {
  padding: var(--space-4) var(--space-4);
  min-height: var(--touch-target-min);
  font-size: var(--font-size-base);
}

/* Chart Container for Touch */
.chart-container {
  min-height: 300px;
  border-radius: var(--radius-xl);
}

/* Stats Grid for Touch */
.stats-grid {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-3);
}

.stat-card {
  padding: var(--space-4);
  border-radius: var(--radius-xl);
}

/* Form Grid for Touch */
.form-grid {
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.form-group {
  gap: var(--space-2);
}

/* Long Press Simulation */
.long-press-active {
  background-color: var(--color-primary);
  color: white;
  transform: scale(0.98);
}

/* Swipe Indicators */
.swipe-indicator {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--font-size-2xl);
  color: var(--color-text-muted);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.swipe-indicator.left {
  left: var(--space-4);
}

.swipe-indicator.right {
  right: var(--space-4);
}

.swipe-active .swipe-indicator {
  opacity: 1;
}

/* Bottom Action Bar for Touch */
.bottom-actions {
  position: fixed;
  bottom: var(--space-4);
  left: var(--space-4);
  right: var(--space-4);
  display: flex;
  gap: var(--space-3);
  background-color: var(--color-surface-elevated);
  padding: var(--space-3);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.bottom-actions .btn {
  flex: 1;
}

/* Hide desktop-only features */
.panel-resizer {
  display: none;
}

.hover-only {
  display: none;
}

/* Landscape Orientation Adjustments */
@media (orientation: landscape) and (max-height: 600px) {
  .panel-content {
    height: calc(100vh - 100px);
  }
  
  .chart-container {
    min-height: 250px;
  }
  
  #app-header {
    padding: var(--space-2) var(--space-4);
  }
  
  #app-header h1 {
    font-size: var(--font-size-lg);
  }
}

/* Small Mobile Adjustments */
@media (max-width: 480px) {
  .tree-item {
    padding: var(--space-3) var(--space-3);
  }
  
  .panel-header,
  .panel-content {
    padding: var(--space-3);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .btn {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-sm);
  }
}