/**
 * VirtualisedList Component Styles
 * 
 * Efficient rendering for large datasets using virtual scrolling.
 * Uses Funky theme system variables (--pro-*) for consistent theming.
 */

/* ========================================
   Container
   ======================================== */

.virtual-list {
  position: relative;
  overflow-y: auto;
  overflow-x: hidden;
  height: 100%;
  width: 100%;
  
  /* Smooth scrolling */
  scroll-behavior: auto;
  -webkit-overflow-scrolling: touch;
  
  /* Performance optimizations */
  will-change: scroll-position;
  contain: strict;
  
  /* Focus styling */
  outline: none;
}

.virtual-list:focus-visible {
  outline: var(--focus-ring-width) var(--focus-ring-style) var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
  box-shadow: var(--focus-ring-shadow);
}

.virtual-list:focus:not(:focus-visible) {
  outline: none;
  box-shadow: none;
}

/* ========================================
   Items Container
   ======================================== */

.virtual-list-items {
  position: relative;
  width: 100%;
}

/* ========================================
   Spacers
   ======================================== */

.virtual-list-spacer {
  width: 100%;
  pointer-events: none;
  flex-shrink: 0;
}

.virtual-list-spacer-top,
.virtual-list-spacer-bottom {
  /* Height set dynamically via JS */
}

/* ========================================
   List Items
   ======================================== */

.virtual-list-item {
  position: relative;
  width: 100%;
  box-sizing: border-box;
  
  /* Prevent layout shift during recycling */
  contain: layout style;
  
  /* Default styling */
  display: flex;
  align-items: center;
  padding: 0 var(--pro-spacing-md, 0.75rem);
  
  /* Theme integration */
  background: var(--pro-bg-primary, #ffffff);
  color: var(--pro-text-primary, #212529);
  border-bottom: 1px solid var(--pro-border-color, rgba(0, 0, 0, 0.1));
  
  /* Transitions */
  transition: background-color 0.15s ease;
}

.virtual-list-item:hover {
  background: var(--pro-bg-hover, rgba(0, 0, 0, 0.04));
}

/* Focused item (keyboard navigation) */
.virtual-list-item.focused {
  background: var(--pro-bg-hover, rgba(0, 0, 0, 0.04));
  outline: 2px solid var(--pro-accent-primary, #ff6600);
  outline-offset: -2px;
}

/* Selected item */
.virtual-list-item.selected {
  background: var(--pro-accent-primary-transparent, rgba(255, 102, 0, 0.1));
}

.virtual-list-item.selected.focused {
  background: var(--pro-accent-primary-transparent, rgba(255, 102, 0, 0.15));
}

/* Active (pressed) state */
.virtual-list-item:active {
  background: var(--pro-bg-active, rgba(0, 0, 0, 0.08));
}

/* ========================================
   Loading State
   ======================================== */

.virtual-list-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--pro-spacing-lg, 1rem);
  color: var(--pro-text-secondary, #6c757d);
}

.virtual-list-loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--pro-border-color, rgba(0, 0, 0, 0.1));
  border-top-color: var(--pro-accent-primary, #ff6600);
  border-radius: 50%;
  animation: virtual-list-spin 0.8s linear infinite;
  margin-right: var(--pro-spacing-sm, 0.5rem);
}

@keyframes virtual-list-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ========================================
   End of List
   ======================================== */

.virtual-list-end {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--pro-spacing-lg, 1rem);
  color: var(--pro-text-tertiary, #adb5bd);
  font-size: var(--pro-font-size-sm, 0.875rem);
}

/* ========================================
   Pull to Refresh
   ======================================== */

.virtual-list-pull-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 0;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.2s ease;
  color: var(--pro-text-secondary, #6c757d);
  font-size: var(--pro-font-size-sm, 0.875rem);
}

.virtual-list-pull-icon {
  font-size: 1.5rem;
  margin-bottom: var(--pro-spacing-xs, 0.25rem);
  transition: transform 0.2s ease;
}

.virtual-list-pull-indicator.ready .virtual-list-pull-icon {
  transform: rotate(180deg);
  color: var(--pro-accent-primary, #ff6600);
}

.virtual-list-pull-indicator.refreshing .virtual-list-pull-icon {
  animation: virtual-list-spin 0.8s linear infinite;
}

.virtual-list-pull-indicator.refreshing {
  opacity: 1 !important;
  height: 60px !important;
}

/* ========================================
   Empty State
   ======================================== */

.virtual-list-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--pro-spacing-2xl, 2rem);
  color: var(--pro-text-secondary, #6c757d);
  text-align: center;
  min-height: 200px;
}

.virtual-list-empty-icon {
  font-size: 3rem;
  margin-bottom: var(--pro-spacing-md, 0.75rem);
  opacity: 0.5;
}

.virtual-list-empty-message {
  font-size: var(--pro-font-size-md, 1rem);
}

/* ========================================
   Dark Theme Adjustments
   ======================================== */

[data-theme="dark"] .virtual-list-item {
  background: var(--pro-bg-primary, #1a1a2e);
  border-bottom-color: var(--pro-border-color, rgba(255, 255, 255, 0.1));
}

[data-theme="dark"] .virtual-list-item:hover {
  background: var(--pro-bg-hover, rgba(255, 255, 255, 0.04));
}

[data-theme="dark"] .virtual-list-item.focused {
  background: var(--pro-bg-hover, rgba(255, 255, 255, 0.04));
}

[data-theme="dark"] .virtual-list-item.selected {
  background: var(--pro-accent-primary-transparent, rgba(255, 102, 0, 0.15));
}

[data-theme="dark"] .virtual-list-item.selected.focused {
  background: var(--pro-accent-primary-transparent, rgba(255, 102, 0, 0.2));
}

[data-theme="dark"] .virtual-list-item:active {
  background: var(--pro-bg-active, rgba(255, 255, 255, 0.08));
}

/* ========================================
   Reduced Motion
   ======================================== */

@media (prefers-reduced-motion: reduce) {
  .virtual-list-item {
    transition: none;
  }
  
  .virtual-list-loading-spinner {
    animation: none;
  }
}

/* ========================================
   Density Modes
   ======================================== */

/* Compact density */
[data-density="compact"] .virtual-list-item {
  padding: 0 var(--pro-spacing-sm, 0.5rem);
}

/* Comfortable density (default) */
[data-density="comfortable"] .virtual-list-item {
  padding: 0 var(--pro-spacing-md, 0.75rem);
}

/* Spacious density */
[data-density="spacious"] .virtual-list-item {
  padding: 0 var(--pro-spacing-lg, 1rem);
}

/* ========================================
   Scrollbar Styling
   ======================================== */

.virtual-list::-webkit-scrollbar {
  width: 8px;
}

.virtual-list::-webkit-scrollbar-track {
  background: var(--pro-bg-secondary, #f8f9fa);
}

.virtual-list::-webkit-scrollbar-thumb {
  background: var(--pro-border-color, rgba(0, 0, 0, 0.2));
  border-radius: 4px;
}

.virtual-list::-webkit-scrollbar-thumb:hover {
  background: var(--pro-text-tertiary, #adb5bd);
}

[data-theme="dark"] .virtual-list::-webkit-scrollbar-track {
  background: var(--pro-bg-secondary, #16161e);
}

[data-theme="dark"] .virtual-list::-webkit-scrollbar-thumb {
  background: var(--pro-border-color, rgba(255, 255, 255, 0.2));
}

[data-theme="dark"] .virtual-list::-webkit-scrollbar-thumb:hover {
  background: var(--pro-text-tertiary, #6c757d);
}

/* ========================================
   Screen Reader Only (Live Region)
   ======================================== */

.virtual-list-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================
   Search Highlight
   ======================================== */

.virtual-list-highlight {
  background: var(--pro-highlight-bg, #fff3cd);
  color: var(--pro-highlight-text, inherit);
  padding: 0 2px;
  border-radius: 2px;
}

[data-theme="dark"] .virtual-list-highlight {
  background: var(--pro-highlight-bg, rgba(255, 193, 7, 0.3));
}

/* Current match styling */
.virtual-list-item.focused .virtual-list-highlight {
  background: var(--pro-accent-primary, #ff6600);
  color: white;
}

/* ========================================
   High Contrast Mode
   ======================================== */

@media (prefers-contrast: more) {
  .virtual-list:focus-visible {
    outline: var(--focus-ring-width) var(--focus-ring-style) var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
    box-shadow: var(--focus-ring-shadow);
  }

  .virtual-list-item {
    border-bottom: 2px solid currentColor;
  }

  .virtual-list-item.focused {
    outline: var(--focus-ring-width) var(--focus-ring-style) var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset-inset);
    box-shadow: var(--focus-ring-shadow-inset);
    background: transparent;
  }

  .virtual-list-item.selected {
    background: Mark;
    color: MarkText;
  }

  .virtual-list-highlight {
    background: Highlight;
    color: HighlightText;
  }
}

/* Forced colors (Windows High Contrast) */
@media (forced-colors: active) {
  .virtual-list:focus-visible {
    outline: var(--focus-ring-width) var(--focus-ring-style) var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset);
  }

  .virtual-list-item.focused {
    outline: var(--focus-ring-width) var(--focus-ring-style) var(--focus-ring-color);
    outline-offset: var(--focus-ring-offset-inset);
  }

  .virtual-list-item.selected {
    background: Highlight;
    color: HighlightText;
    forced-color-adjust: none;
  }
  
  .virtual-list-loading-spinner {
    border-color: CanvasText;
    border-top-color: Highlight;
  }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
  .virtual-list {
    overflow: visible;
    height: auto !important;
  }

  .virtual-list-spacer-top,
  .virtual-list-spacer-bottom {
    display: none;
  }

  .virtual-list-item {
    break-inside: avoid;
    page-break-inside: avoid;
  }

  .virtual-list-loading,
  .virtual-list-end,
  .virtual-list-pull-indicator {
    display: none !important;
  }
}

/* ========================================
   Playground Demo Styles
   ======================================== */

.vlist-demo__container {
  height: 400px;
  border: 1px solid var(--pro-border-color, rgba(255, 255, 255, 0.1));
  border-radius: var(--pro-border-radius, 6px);
  background: var(--pro-bg-secondary, rgba(255, 255, 255, 0.03));
  overflow: hidden;
}

.vlist-demo__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.vlist-demo__stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.vlist-demo__stat-label {
  font-size: var(--pro-font-size-xs, 0.75rem);
  font-weight: var(--pro-font-weight-medium, 500);
  color: var(--pro-text-muted, #adb5bd);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.vlist-demo__stat-value {
  font-size: var(--pro-font-size-lg, 1.125rem);
  font-weight: var(--pro-font-weight-semibold, 600);
  color: var(--pro-text-primary, #f8f9fa);
  font-family: var(--pro-font-mono, 'Monaco', 'Menlo', monospace);
}

.vlist-demo__button-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--pro-spacing-sm, 0.75rem);
  align-items: flex-start;
}

.vlist-demo__button-grid .btn {
  flex-shrink: 0;
}

.vlist-demo__log {
  font-family: var(--pro-font-mono, 'Monaco', 'Menlo', 'Consolas', monospace);
  font-size: var(--pro-font-size-sm, 0.8125rem);
  line-height: 1.6;
  padding: var(--pro-spacing-md, 1rem);
  margin: 0;
  background: var(--pro-bg-tertiary, var(--pro-bg-secondary));
  color: var(--pro-text-muted, var(--pro-text-secondary));
  border-radius: var(--pro-radius-md, 6px);
  border: 1px solid var(--pro-border-color);
  min-height: 80px;
  max-height: 200px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Demo list item styling */
.vlist-demo__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  height: 100%;
  gap: 1rem;
  border-bottom: 1px solid var(--pro-border-color-light, rgba(255, 255, 255, 0.05));
}

.vlist-demo__item-main {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.vlist-demo__item-index {
  font-size: var(--pro-font-size-xs, 0.75rem);
  font-weight: var(--pro-font-weight-medium, 500);
  color: var(--pro-text-muted, #6c757d);
  font-family: var(--pro-font-mono, monospace);
  min-width: 60px;
}

.vlist-demo__item-name {
  font-weight: var(--pro-font-weight-medium, 500);
  color: var(--pro-text-primary, #f8f9fa);
  white-space: nowrap;
}

.vlist-demo__item-desc {
  font-size: var(--pro-font-size-sm, 0.875rem);
  color: var(--pro-text-muted, #adb5bd);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.vlist-demo__item-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.vlist-demo__item-priority {
  font-size: var(--pro-font-size-sm, 0.875rem);
  color: var(--pro-text-muted, #6c757d);
}

/* Light theme */
[data-theme="light"] .vlist-demo__container {
  background: var(--pro-bg-secondary, #f8f9fa);
  border-color: var(--pro-border-color, #dee2e6);
}

[data-theme="light"] .vlist-demo__stat-value {
  color: var(--pro-text-primary, #212529);
}

[data-theme="light"] .vlist-demo__log {
  background: var(--pro-bg-tertiary, #e9ecef);
  border-color: var(--pro-border-color, #dee2e6);
}

[data-theme="light"] .vlist-demo__item {
  border-bottom-color: var(--pro-border-color-light, rgba(0, 0, 0, 0.05));
}

[data-theme="light"] .vlist-demo__item-name {
  color: var(--pro-text-primary, #212529);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .vlist-demo__container {
    height: 300px;
  }

  .vlist-demo__stats {
    gap: 1rem;
  }

  .vlist-demo__stat-value {
    font-size: var(--pro-font-size-base, 1rem);
  }

  .vlist-demo__button-grid {
    gap: var(--pro-spacing-xs, 0.5rem);
  }

  .vlist-demo__button-grid .btn {
    flex: 1 1 calc(50% - var(--pro-spacing-xs, 0.5rem));
    min-width: 130px;
  }

  .vlist-demo__item-desc {
    display: none;
  }
}

@media (max-width: 480px) {
  .vlist-demo__button-grid .btn {
    flex: 1 1 100%;
  }

  .vlist-demo__item-index {
    min-width: 45px;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .vlist-demo__log {
    border-width: 2px;
  }

  .vlist-demo__container {
    border-width: 2px;
  }
}

[data-theme="high-contrast"] .vlist-demo__log {
  border: 2px solid #ffffff;
  background: #000000;
  color: #ffffff;
}

[data-theme="high-contrast"] .vlist-demo__container {
  border: 2px solid #ffffff;
}