/* ========================================================================
   3D VIEWER STYLESHEET
   Organized styles for the Babylon.js 3D model viewer
   ======================================================================== */

/* ========================================================================
   TABLE OF CONTENTS
   ========================================================================

   1. CSS VARIABLES & DESIGN TOKENS
   2. BASE & RESET STYLES  
   3. LAYOUT & STRUCTURE
   4. UI COMPONENTS
      - Control Panels
      - Buttons & Icons
      - Form Controls
      - Info Displays
   5. SPECIALIZED FEATURES
      - Camera Limits UI
      - Export Dialog
      - Loading States
   6. RESPONSIVE DESIGN
   7. ACCESSIBILITY & PREFERENCES

   ======================================================================== */

/* ========================================================================
   1. CSS VARIABLES & DESIGN TOKENS
   ======================================================================== */
:root {
  /* Color Palette */
  --color-bg-primary: rgba(30, 30, 30, 0.85);
  --color-bg-secondary: rgba(60, 60, 60, 0.8);
  --color-bg-tertiary: rgba(80, 80, 80, 0.8);
  --color-text-primary: #ffffff;
  --color-text-secondary: #cccccc;
  --color-accent: #2196f3;
  --color-accent-hover: #42a5f5;
  --color-accent-light: rgba(33, 150, 243, 0.2);
  --color-border: rgba(100, 100, 100, 0.4);
  --color-backdrop: rgba(0, 0, 0, 0.5);
  --color-success: #4caf50;
  --color-warning: #ff9800;
  --color-error: #f44336;
  
  /* Layout Dimensions */
  --icon-bar-height: 48px;
  --control-panel-width: 320px;
  
  /* Spacing Scale */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  
  /* Typography Scale */
  --font-size-xs: 10px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  
  /* Border Radius Scale */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-circle: 50%;
  
  /* Animation Timing */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;
  
  /* Layer Management */
  --z-index-controls: 1000;
  --z-index-fab: 1100;
  --z-index-toast: 2000;
  --z-index-spinner: 3000;
  
  /* Shadow Variants */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
}

/* ========================================================================
   2. BASE & RESET STYLES
   ======================================================================== */

/* WordPress iframe embedding fix - ensure consistent background */
html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  width: 100%;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  /* Force specific background color to prevent WordPress/iframe inheritance issues */
  background-color: #191919 !important;
  background: #191919 !important;
}

#renderCanvas {
  width: 100%;
  height: 100%;
  /* Ensure canvas has consistent background color */
  background-color: #191919 !important;
  background: #191919 !important;
  touch-action: none;
  outline: none;
}

/* Additional iframe embedding support */
body {
  /* Override any WordPress/parent page styles */
  color: #ffffff !important;
}

/* Ensure consistent styling when embedded */
html[style*="background"], body[style*="background"] {
  background: #191919 !important;
  background-color: #191919 !important;
}

/* ========================================================================
   3. LAYOUT & STRUCTURE
   ======================================================================== */

/* Base Control Panel Positioning - Shared by all control panel states */
.control-panel,
#controlPanel {
  position: fixed !important;
  top: var(--spacing-md) !important;
  right: var(--spacing-md) !important;
  bottom: auto !important;
  left: auto !important;
}

/* Main Control Panel Container */
.control-panel {
  width: auto;
  max-height: 90vh;
  color: var(--color-text-primary);
  z-index: var(--z-index-controls);
  display: flex;
  flex-direction: column;
  font-size: var(--font-size-base);
  transition: width var(--transition-base), height var(--transition-base);
}

/* Panel States */
.control-panel.expanded {
  width: min(90vw, 400px);
  max-height: 90vh;
  background-color: transparent;
  border-radius: var(--border-radius-lg);
  padding: 0;
  margin: 0 !important;
}

.control-panel.expanded .control-panel-content {
  width: 100%;
  margin: var(--spacing-sm) 0 0 0;
  max-height: calc(90vh - var(--icon-bar-height) - var(--spacing-xl));
  overflow-y: auto;
  border-radius: var(--border-radius-md);
  background-color: var(--color-bg-primary);
  box-shadow: var(--shadow-lg);
  margin-left: 0;
  margin-right: 0;
}

/* ========================================================================
   4. UI COMPONENTS
   ======================================================================== */

/* === CONTROL PANELS === */

/* Icon Bar */
.icon-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-xs);
  background-color: var(--color-bg-primary);
  padding: var(--spacing-xs) var(--spacing-sm) !important;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  height: var(--icon-bar-height);
  box-sizing: border-box;
  transition: none !important;
  position: relative;
  z-index: 1;
  margin-bottom: 0;
}

/* Content Panel */
.control-panel-content {
  margin-top: var(--spacing-sm);
  background-color: var(--color-bg-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  max-height: 70vh;
  overflow-y: auto;
  min-width: var(--control-panel-width);
  box-sizing: border-box;
}

.control-panel-content[style*="display: block"] {
  opacity: 1;
  transform: scale(1);
}

.content-section {
  display: none;
  overflow-y: auto;
}

.content-section h4 {
  margin-top: 0;
  margin-bottom: var(--spacing-lg);
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-sm);
  font-weight: 500;
  font-size: var(--font-size-lg);
}

/* Close Button */
.close-panel-button {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: var(--color-bg-tertiary);
  border: none;
  color: var(--color-text-primary);
  width: 32px;
  height: 32px;
  border-radius: var(--border-radius-circle);
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 18px;
  font-weight: bold;
  transition: background-color var(--transition-fast);
  z-index: 10;
}

.close-panel-button:hover {
  background-color: var(--color-error);
}

/* === BUTTONS & ICONS === */

/* Shared Button Base */
.icon-button,
.action-button {
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background-color var(--transition-fast);
}

/* Icon Buttons */
.icon-button {
  background: none;
  color: var(--color-text-primary);
  padding: var(--spacing-sm);
  margin: 0 var(--spacing-xs);
  border-radius: var(--border-radius-circle);
  width: 44px;
  height: 44px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  position: relative;
}

.icon-button svg {
  width: 24px;
  height: 24px;
  display: block;
}

.icon-button:hover {
  background-color: var(--color-bg-secondary);
}

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

.icon-button.touch-active {
  background-color: var(--color-accent-light);
}

/* Action Buttons */
.action-button {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-accent);
  color: white;
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  font-weight: 500;
}

.action-button:hover {
  background-color: var(--color-accent-hover);
}

.action-button:disabled {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  cursor: not-allowed;
}

/* Action Button Icon + Text Layout */
.action-button svg {
  margin-right: var(--spacing-sm);
  flex-shrink: 0;
}

.action-button .button-text {
  flex: 1;
}

/* === FORM CONTROLS === */

/* Control Groups */
.control-group {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.control-group:last-child {
  margin-bottom: 0;
}

.control-group label {
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  cursor: pointer;
}

/* Toggle Switches */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 20px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-bg-tertiary);
  transition: var(--transition-fast);
  border-radius: 20px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 2px;
  bottom: 2px;
  background-color: white;
  transition: var(--transition-fast);
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--color-accent);
}

input:checked + .slider:before {
  transform: translateX(24px);
}

/* Range Sliders - Base Styles */
.slider-range {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--color-bg-tertiary);
  outline: none;
  opacity: 0.8;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.slider-range.enhanced {
  height: 8px;
  border-radius: 4px;
  background: linear-gradient(to right, var(--color-bg-secondary) 0%, var(--color-accent-light) 100%);
  opacity: 0.9;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.slider-range:hover,
.slider-range.enhanced:hover {
  opacity: 1;
  background: linear-gradient(to right, var(--color-bg-tertiary) 0%, var(--color-accent) 100%);
}

/* Slider Thumb - Shared Styles */
.slider-range::-webkit-slider-thumb,
.slider-range::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  transition: all var(--transition-fast);
}

.slider-range::-webkit-slider-thumb {
  appearance: none;
}

.slider-range::-moz-range-thumb {
  border: none;
}

.slider-range::-webkit-slider-thumb:hover,
.slider-range::-moz-range-thumb:hover {
  background: var(--color-accent-hover);
  transform: scale(1.1);
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.3);
}

.slider-range::-webkit-slider-thumb:active,
.slider-range::-moz-range-thumb:active {
  transform: scale(1.2);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

/* Select Dropdowns */
.settings-select {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  color: var(--color-text-primary);
  padding: var(--spacing-sm);
  font-size: var(--font-size-base);
  cursor: pointer;
  min-width: 120px;
}

.settings-select:focus {
  outline: none;
  border-color: var(--color-accent);
}

/* === INFO DISPLAYS === */

/* Content Groups - Shared Styles */
.settings-category,
.info-group {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius-md);
}

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

.settings-separator {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--spacing-lg) 0;
}


.info-list {
  margin: 0;
  padding-left: var(--spacing-lg);
  list-style-type: square;
}

.info-list li {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.info-action {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* Developer Info */
.dev-section {
  margin-bottom: var(--spacing-lg);
}

.dev-title,
.info-title {
  font-weight: 500;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.scene-info {
  background-color: var(--color-bg-secondary);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
}

.info-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.info-row:last-child {
  margin-bottom: 0;
}

.info-label {
  color: var(--color-text-secondary);
}

.info-value {
  color: var(--color-text-primary);
  font-family: monospace;
}

/* Model Loader - Shared Input Styles */
.model-loader {
  margin-bottom: var(--spacing-md);
}

.file-loader {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.file-label,
.url-input {
  width: 100%;
  padding: var(--spacing-md);
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius-md);
  transition: background-color var(--transition-fast);
  box-sizing: border-box;
}

.file-label {
  display: block;
  text-align: center;
  cursor: pointer;
  margin-bottom: var(--spacing-sm);
}

.file-label:hover,
.url-input:focus {
  background-color: var(--color-bg-tertiary);
}

input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.url-input {
  border: none;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-base);
  outline: none;
}

/* ========================================================================
   5. SPECIALIZED FEATURES
   ======================================================================== */

/* === CAMERA LIMITS UI === */

.limit-details {
  margin-left: var(--spacing-lg);
  padding: var(--spacing-sm) 0;
  border-left: 2px solid var(--color-accent-light);
  padding-left: var(--spacing-md);
  margin-top: var(--spacing-sm);
  background-color: rgba(33, 150, 243, 0.05);
  border-radius: var(--border-radius-sm);
  animation: slideIn 0.3s ease-out;
  transform-origin: top;
}

.range-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  flex-wrap: wrap;
}

.range-container.enhanced {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--spacing-sm);
  align-items: center;
  flex-wrap: nowrap;
}

.range-container:last-child {
  margin-bottom: 0;
}

/* Range Input Field */
.range-input {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  color: var(--color-text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.85rem;
  width: 75px;
  text-align: center;
  transition: all var(--transition-fast);
  font-family: monospace;
}

.range-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-light);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
}

.range-input:hover:not(:focus) {
  border-color: var(--color-accent-light);
  background: var(--color-bg-tertiary);
}

/* Fix for number input steppers */
.range-input::-webkit-outer-spin-button,
.range-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.range-input[type=number] {
  -moz-appearance: textfield;
}

/* Range Unit Display */
.range-unit {
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  min-width: 20px;
  text-align: left;
}

/* Enhanced slider styling */
.range-container.enhanced .slider-range {
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Color Picker Styles */
.color-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.color-container:last-child {
  margin-bottom: 0;
}

.color-picker {
  width: 50px;
  height: 30px;
  border: 2px solid var(--color-border);
  border-radius: 6px;
  background: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.color-picker:hover {
  border-color: var(--color-accent);
}

.color-picker::-webkit-color-swatch-wrapper {
  padding: 0;
  border-radius: 4px;
  overflow: hidden;
}

.color-picker::-webkit-color-swatch {
  border: none;
  border-radius: 4px;
}

.color-picker::-moz-color-swatch {
  border: none;
  border-radius: 4px;
}

.color-value {
  min-width: 70px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-family: monospace;
  padding: 4px 8px;
  background: var(--color-bg-tertiary);
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

.range-label {
  min-width: 70px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
}

.range-display {
  min-width: 40px;
  text-align: center;
  font-family: monospace;
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  font-weight: bold;
  background-color: var(--color-bg-tertiary);
  padding: 2px 6px;
  border-radius: var(--border-radius-sm);
}

.range-separator {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0 var(--spacing-xs);
}

.limit-details .slider-range {
  flex: 1;
  min-width: 100px;
  background: linear-gradient(to right, var(--color-bg-tertiary), var(--color-accent-light));
  transition: opacity var(--transition-fast), background var(--transition-fast);
}

.limit-details .slider-range:hover {
  background: linear-gradient(to right, var(--color-bg-secondary), var(--color-accent));
}

.settings-category .action-button {
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.settings-category .action-button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.settings-category .action-button:active {
  transform: translateY(0);
}

#resetLimitsButton {
  background-color: var(--color-bg-tertiary) !important;
  color: var(--color-text-secondary);
}

#resetLimitsButton:hover {
  background-color: var(--color-warning) !important;
  color: white;
}

.control-group input[type="checkbox"]:checked + .slider {
  box-shadow: 0 0 10px rgba(33, 150, 243, 0.3);
}

.settings-category .control-group:has(.limit-details) {
  margin-bottom: var(--spacing-lg);
}

.settings-category:has(#cameraLimitsToggle) {
  transition: all var(--transition-base);
  border: 1px solid transparent;
  border-radius: var(--border-radius-md);
}

.range-info {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background-color: rgba(33, 150, 243, 0.1);
  border-radius: var(--border-radius-sm);
  border-left: 3px solid var(--color-accent);
}

.range-info small {
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  line-height: 1.4;
  display: block;
  margin-bottom: 2px;
}

.range-info small:last-child {
  margin-bottom: 0;
}

#verticalUpRange,
#verticalDownRange {
  background: linear-gradient(to right, 
    rgba(255, 87, 34, 0.3),
    rgba(76, 175, 80, 0.3),
    rgba(255, 87, 34, 0.3)
  );
}

#horizontalAngleRange {
  background: linear-gradient(to right,
    rgba(255, 193, 7, 0.3),
    rgba(76, 175, 80, 0.3)
  );
}

#horizontalOffsetRange {
  background: linear-gradient(to right,
    rgba(33, 150, 243, 0.2),
    rgba(33, 150, 243, 0.4),
    rgba(33, 150, 243, 0.2)
  );
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: scaleY(0);
  }
  to {
    opacity: 1;
    transform: scaleY(1);
  }
}

/* === EXPORT DIALOG === */

.export-dialog {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-backdrop);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: calc(var(--z-index-controls) + 100);
  animation: fadeIn 0.3s ease;
}

.export-dialog-content {
  background: var(--color-bg-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  max-width: 450px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.export-dialog-content h3 {
  margin: 0 0 var(--spacing-lg) 0;
  color: var(--color-accent);
  font-size: var(--font-size-xl);
  font-weight: 500;
}

.export-dialog-content p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.export-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-xl) 0;
}

.export-option {
  background: var(--color-bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--border-radius-md);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  color: var(--color-text-primary);
  text-align: center;
}

.export-option:hover {
  border-color: var(--color-accent);
  background: var(--color-bg-tertiary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.export-option:active {
  transform: translateY(0);
}

.export-option-icon {
  font-size: 32px;
  margin-bottom: var(--spacing-sm);
  filter: grayscale(0.2);
}

.export-option-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-base);
}

.export-option-desc {
  font-size: var(--font-size-sm);
  opacity: 0.7;
  line-height: 1.4;
}

.export-cancel {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-tertiary);
  border: none;
  border-radius: var(--border-radius-md);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: background var(--transition-fast);
  font-size: var(--font-size-base);
  font-weight: 500;
}

.export-cancel:hover {
  background: var(--color-bg-secondary);
}

.export-progress {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: calc(var(--z-index-controls) + 200);
  min-width: 300px;
  text-align: center;
}

.export-progress-bar {
  width: 100%;
  height: 4px;
  background: var(--color-bg-tertiary);
  border-radius: 2px;
  margin: var(--spacing-lg) 0;
  overflow: hidden;
}

.export-progress-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: 2px;
  transition: width 0.3s ease;
  width: 0%;
}

.export-progress-text {
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-sm);
}

.export-progress-subtext {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* === LOADING STATES === */

.loading-spinner {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: none;
  flex-direction: column;
  align-items: center;
  z-index: var(--z-index-spinner);
  background-color: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  pointer-events: none; /* Allow interaction with elements below */
}

.spinner-animation {
  border: 3px solid var(--color-bg-tertiary);
  border-top: 3px solid var(--color-accent);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-md);
}

.spinner-text {
  color: var(--color-text-secondary);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Toast Messages */
.toast-message {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-index-toast);
  font-size: var(--font-size-base);
  max-width: 90vw;
  text-align: center;
  opacity: 0;
  transition: all var(--transition-base);
}

.toast-message.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Debug Info */
.device-debug-info {
  position: fixed;
  top: 80px;
  left: 16px;
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-family: monospace;
  font-size: var(--font-size-sm);
  z-index: var(--z-index-controls);
  min-width: 200px;
  border: 1px solid var(--color-border);
}

.debug-line {
  margin-bottom: var(--spacing-xs);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.debug-line:last-child {
  margin-bottom: 0;
}

.debug-line strong {
  color: var(--color-accent);
  margin-right: var(--spacing-md);
}

/* ========================================================================
   6. RESPONSIVE DESIGN
   ======================================================================== */

/* Mobile devices with touch input */
@media (max-width: 768px) and (pointer: coarse) and (hover: none) {
  :root {
    --control-panel-width: 320px;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --spacing-xs: 6px;
    --spacing-sm: 10px;
    --spacing-md: 16px;
    --spacing-lg: 20px;
    --spacing-xl: 28px;
    --icon-bar-height: 56px;
  }
  
  .control-panel-content {
    max-height: 65vh;
    padding: var(--spacing-lg);
  }
  
  .icon-button {
    width: 52px;
    height: 52px;
    min-width: 52px;
    min-height: 52px;
    font-size: var(--font-size-lg);
  }
  
  .close-panel-button {
    width: 36px;
    height: 36px;
    font-size: 20px;
    right: 12px;
    top: 12px;
  }
  
  .control-group {
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-md);
  }
  
  .control-group label {
    font-size: var(--font-size-base);
    font-weight: 500;
  }
  
  .switch {
    width: 60px;
    height: 34px;
  }
  
  .switch input {
    width: 60px;
    height: 34px;
  }
  
  .slider {
    height: 34px;
    border-radius: 34px;
  }
  
  .slider:before {
    height: 28px;
    width: 28px;
    left: 3px;
    bottom: 3px;
    border-radius: 50%;
  }
  
  input:checked + .slider:before {
    transform: translateX(26px);
  }
  
  .slider-range {
    height: 8px;
    min-height: 44px;
    padding: 18px 0;
  }
  
  .range-value {
    font-size: var(--font-size-base);
    font-weight: 600;
    min-width: 50px;
    padding: var(--spacing-sm);
  }
  
  .action-button {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    min-height: 44px;
  }
  
  .settings-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
  }
  
  .settings-select {
    font-size: var(--font-size-base);
    padding: var(--spacing-md);
    min-height: 48px;
  }

  .range-container {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-xs);
  }
  
  .range-label {
    min-width: auto;
    margin-bottom: var(--spacing-xs);
  }
  
  .limit-details .slider-range {
    min-width: auto;
    width: 100%;
  }
  
  .range-display {
    align-self: center;
    margin-top: var(--spacing-xs);
  }
  
  .limit-details {
    margin-left: var(--spacing-sm);
    padding-left: var(--spacing-sm);
  }
}

/* General small screens */
@media (max-width: 768px) {
  :root {
    --control-panel-width: 280px;
  }
  
  .control-panel {
    width: auto;
  }
  
  .control-panel-content {
    max-height: 60vh;
    padding: var(--spacing-md);
  }
  
  .icon-button {
    width: 48px;
    height: 48px;
  }
  
  .icon-button svg {
    width: 26px;
    height: 26px;
  }
  
  .control-group {
    margin-bottom: var(--spacing-lg);
  }
  
  .action-button {
    padding: var(--spacing-md);
    font-size: var(--font-size-lg);
  }

  .export-dialog-content {
    max-width: 95%;
    padding: var(--spacing-lg);
  }
  
  .export-options {
    grid-template-columns: 1fr;
  }
  
  .export-option {
    padding: var(--spacing-md);
  }
}

/* Touch devices */
@media (pointer: coarse) {
  .icon-button {
    width: 48px !important;
    height: 48px !important;
  }
  
  .icon-button svg {
    width: 26px !important;
    height: 26px !important;
  }
}

/* Very small screens */
@media (max-width: 480px) {
  .icon-bar {
    padding: var(--spacing-xs);
  }
  
  .icon-button {
    margin: 0 var(--spacing-xs);
    width: 48px;
    height: 48px;
  }
  
  .icon-button svg {
    width: 26px;
    height: 26px;
  }
  
  .settings-select {
    min-width: 100px;
  }
  
  .control-panel.expanded .control-panel-content {
    padding-top: calc(var(--spacing-lg) + 10px);
    display: block;

  }
  
  .control-panel.expanded {
    width: 100%;
    height: 100%;
    top: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    left: 0 !important;
    margin: 0;
    border-radius: 0;
    padding: var(--spacing-md);
  }

  #controlPanel.expanded,
  .control-panel.expanded {
    top: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    left: 0 !important;
  }

  .settings-category .action-button {
    padding: var(--spacing-sm);
    font-size: var(--font-size-base);
  }
  
  .range-container {
    gap: var(--spacing-sm);
  }

  .range-info {
    padding: var(--spacing-xs);
    margin-top: var(--spacing-xs);
  }
  
  .range-info small {
    font-size: 10px;
  }
}

/* ========================================================================
   7. ACCESSIBILITY & PREFERENCES
   ======================================================================== */

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --color-bg-primary: rgba(0, 0, 0, 0.9);
    --color-bg-secondary: rgba(40, 40, 40, 0.95);
    --color-bg-tertiary: rgba(70, 70, 70, 0.95);
    --color-border: rgba(150, 150, 150, 0.6);
    --color-accent: #64b5f6;
    --color-accent-hover: #90caf9;
  }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .toast-message {
    transition: none;
  }
}

/* ========================================================================
   8. SHARED LINKS UI - SIMPLIFIED MODE
   ======================================================================== */

/* Hamburger menu for shared links */
.icon-bar.shared-mode.hamburger-style {
  background: var(--color-bg-primary);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border);
  position: relative;
  max-width: 64px; /* Just enough for hamburger button */
}

/* Hamburger button */
.hamburger-button {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-md);
  transition: background-color var(--transition-fast);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hamburger-button:hover {
  background: var(--color-bg-secondary);
}

.hamburger-button.active {
  background: var(--color-accent-light);
}

/* Hamburger icon animation */
.hamburger-icon {
  width: 24px;
  height: 18px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hamburger-icon span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: all 0.3s ease;
}

.hamburger-button.active .hamburger-icon span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-button.active .hamburger-icon span:nth-child(2) {
  opacity: 0;
}

.hamburger-button.active .hamburger-icon span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Hamburger menu dropdown */
.hamburger-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--spacing-sm);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  min-width: 180px;
  z-index: 1001;
  opacity: 1;
  transform: translateY(0);
  transition: all 0.3s ease;
}

.hamburger-menu.hidden {
  opacity: 0;
  transform: translateY(-10px);
  pointer-events: none;
}

/* Menu items */
.menu-item {
  display: flex;
  align-items: center;
  width: 100%;
  padding: var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  border-radius: 0;
  font-size: 0.9rem;
  gap: var(--spacing-sm);
}

.menu-item:hover {
  background: var(--color-bg-secondary);
}

.menu-item:first-child {
  border-top-left-radius: var(--border-radius-md);
  border-top-right-radius: var(--border-radius-md);
}

.menu-item:last-child {
  border-bottom-left-radius: var(--border-radius-md);
  border-bottom-right-radius: var(--border-radius-md);
}

.menu-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.menu-item span {
  font-weight: 500;
}

/* Quality menu item styling */
.quality-menu-item #qualityDisplay {
  font-weight: 600;
  color: var(--color-accent);
  margin-left: var(--spacing-xs);
}

/* Removed unused quality content styling - using direct toggle now */

/* Simplified control panel for shared mode */
.control-panel:has(.icon-bar.shared-mode.hamburger-style) {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  bottom: auto;
  left: auto;
  transform: none;
  z-index: 999;
}

/* No content panels needed for shared mode - using direct controls */

/* Removed unused quality select styling - using toggle button instead */

/* Removed shared mode badge to clean up the interface */

/* Responsive adjustments for shared mode */
@media (max-width: 768px) {
  .icon-bar.shared-mode.hamburger-style {
    max-width: 60px;
    padding: var(--spacing-xs);
  }
  
  .hamburger-button {
    width: 44px;
    height: 44px;
  }
  
  .control-panel:has(.icon-bar.shared-mode.hamburger-style) {
    top: var(--spacing-md);
    right: var(--spacing-md);
  }
}