/*
╔═══════════════════════════════════════════════════════════╗
║                        NEURAL STYLE MEMORY BOOK                      ║
║                    Main Styles & Component Library                   ║
╠═══════════════════════════════════════════════════════════╣
║ File: css/styles.css                                                 ║
║ Purpose: Core styling with advanced CSS techniques and components    ║
║ Version: 1.2.0                                                       ║
║ Author: Neural Style Memory Book Team                                ║
║ Created: 2024                                                        ║
║                                                                      ║
║ Features:                                                            ║
║ • Glass morphism effects throughout UI                               ║
║ • Neural network loading animations                                  ║
║ • 3D book styling with Three.js integration                          ║
║ • Advanced export and share modal systems                            ║
║ • Interactive style controls with real-time preview                  ║
║ • Smooth micro-interactions and hover effects                        ║
║ • Performance-optimized animations with GPU acceleration             ║
║ • Complete accessibility with ARIA support                           ║
║ • Memory hotspot styling for face detection                          ║
║                                                                      ║
║ Architecture:                                                        ║
║ • Mobile-first responsive design                                     ║
║ • Component-based organization                                       ║
║ • CSS Grid and Flexbox layouts                                       ║
║ • Custom properties from variables.css                               ║
║ • Modern CSS features (backdrop-filter, clamp, etc.)                 ║
║                                                                      ║
║ Dependencies: variables.css (must be loaded first)                   ║
║ Browser Support: Modern browsers with CSS Grid and Custom Properties ║
╚═══════════════════════════════════════════════════════════╝
*/

/* Neural Style Memory Book - Main Styles */
/* Advanced CSS techniques for immersive AI experience */

/* === BASE RESET & TYPOGRAPHY === */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* === UTILITY CLASSES === */

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.glass-effect {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--glass-border);
}

.neural-gradient {
  background: var(--gradient-neural-primary);
  background-size: 200% 200%;
  animation: gradientShift 4s ease-in-out infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* === LOADING SCREEN === */

.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: linear-gradient(135deg, #0f0f23 0%, #1e1b4b 50%, #312e81 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.loading-container {
  text-align: center;
  max-width: 400px;
  padding: var(--space-8);
}

.neural-loader {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto var(--space-8);
}

.neural-nodes {
  position: relative;
  width: 100%;
  height: 100%;
}

.node {
  position: absolute;
  width: var(--node-size);
  height: var(--node-size);
  background: var(--color-neural-primary);
  border-radius: 50%;
  animation: nodeGlow 2s ease-in-out infinite;
}

.node:nth-child(1) {
  top: 20%;
  left: 20%;
  animation-delay: 0s;
}

.node:nth-child(2) {
  top: 20%;
  right: 20%;
  animation-delay: 0.5s;
}

.node:nth-child(3) {
  bottom: 20%;
  left: 20%;
  animation-delay: 1s;
}

.node:nth-child(4) {
  bottom: 20%;
  right: 20%;
  animation-delay: 1.5s;
}

@keyframes nodeGlow {
  0%, 100% {
    box-shadow: 0 0 10px var(--color-neural-primary);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 20px var(--color-neural-primary);
    transform: scale(1.2);
  }
}

.neural-connections {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  border: 2px solid var(--color-neural-secondary);
  border-radius: 50%;
  animation: connectionPulse 3s ease-in-out infinite;
}

@keyframes connectionPulse {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.5);
    opacity: 0.5;
  }
}

.loading-title {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-2);
  background: var(--gradient-neural-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.loading-subtitle {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--color-surface-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-neural-primary);
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
  animation: progressGlow 2s ease-in-out infinite;
}

@keyframes progressGlow {
  0%, 100% {
    box-shadow: 0 0 10px var(--color-neural-primary);
  }
  50% {
    box-shadow: 0 0 20px var(--color-neural-primary);
  }
}

/* === APP LAYOUT === */

.app {
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 100vh;
  opacity: 0;
  transition: opacity 0.5s ease-in;
}

.app.loaded {
  opacity: 1;
}

/* === HEADER === */

.app-header {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border-bottom: 1px solid var(--color-border-primary);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.header-content {
  max-width: var(--container-7xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.app-title {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--gradient-neural-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-icon {
  font-size: var(--font-size-2xl);
  animation: iconFloat 3s ease-in-out infinite;
}

@keyframes iconFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}

.header-nav {
  display: flex;
  gap: var(--space-3);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: transparent;
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
  position: relative;
  overflow: hidden;
}

.nav-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--gradient-neural-primary);
  transition: left var(--duration-normal) var(--ease-neural);
  z-index: -1;
}

.nav-btn:hover::before {
  left: 0;
}

.nav-btn:hover {
  color: var(--color-text-primary);
  border-color: transparent;
  box-shadow: var(--shadow-glow-sm);
}

.nav-btn:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.btn-icon {
  font-size: var(--font-size-lg);
}

/* === UPLOAD SECTION === */

.upload-section {
  padding: var(--space-fluid-lg);
  max-width: var(--container-4xl);
  margin: 0 auto;
  width: 100%;
}

.upload-container {
  text-align: center;
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-8);
  background: var(--gradient-neural-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.upload-zone {
  position: relative;
  border: 2px dashed var(--color-border-primary);
  border-radius: var(--radius-2xl);
  padding: var(--space-16);
  margin-bottom: var(--space-8);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  transition: all var(--duration-normal) var(--ease-neural);
  cursor: pointer;
  overflow: hidden;
}

.upload-zone::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-neural-primary);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-neural);
  z-index: -1;
}

.upload-zone:hover::before {
  opacity: 0.1;
}

.upload-zone.dragover {
  border-color: var(--color-neural-primary);
  box-shadow: var(--shadow-glow-md);
}

.upload-zone.dragover::before {
  opacity: 0.2;
}

.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.upload-content {
  pointer-events: none;
}

.upload-icon {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-4);
  animation: iconBounce 2s ease-in-out infinite;
}

@keyframes iconBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.upload-text {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-2);
}

.upload-subtext {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.upload-preview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.preview-item {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-secondary);
  aspect-ratio: 4/3;
}

.preview-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-normal) var(--ease-neural);
}

.preview-item:hover .preview-image {
  transform: scale(1.05);
}

.preview-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-neural);
}

.preview-item:hover .preview-overlay {
  opacity: 1;
}

.preview-remove {
  background: var(--color-error);
  border: none;
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-neural);
}

.preview-remove:hover {
  transform: scale(1.1);
}

/* === STYLE PANEL === */

.style-panel {
  position: fixed;
  left: var(--space-6);
  top: 50%;
  transform: translateY(-50%);
  width: 280px;
  max-height: 80vh;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  z-index: var(--z-fixed);
  overflow-y: auto;
  transition: transform var(--duration-normal) var(--ease-neural);
}

.style-panel.hidden {
  transform: translateY(-50%) translateX(-100%);
}

.panel-title {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-6);
  text-align: center;
}

.style-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--style-grid-gap);
  margin-bottom: var(--space-8);
}

.style-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  background: transparent;
  border: 2px solid var(--color-border-secondary);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
  position: relative;
  overflow: hidden;
}

.style-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-neural-primary);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-neural);
  z-index: -1;
}

.style-btn:hover::before {
  opacity: 0.1;
}

.style-btn.active {
  border-color: var(--color-neural-primary);
  box-shadow: var(--shadow-glow-sm);
}

.style-btn.active::before {
  opacity: 0.2;
}

.style-preview {
  width: var(--style-preview-size);
  height: var(--style-preview-size);
  border-radius: var(--radius-md);
  background-size: cover;
  background-position: center;
  transition: transform var(--duration-normal) var(--ease-neural);
}

.style-btn:hover .style-preview {
  transform: scale(1.1);
}

.style-preview.original {
  background: linear-gradient(45deg, #f0f0f0, #e0e0e0);
}

.style-preview.vangogh {
  background: linear-gradient(45deg, var(--vangogh-primary), var(--vangogh-secondary));
}

.style-preview.picasso {
  background: linear-gradient(45deg, var(--picasso-primary), var(--picasso-secondary));
}

.style-preview.monet {
  background: linear-gradient(45deg, var(--monet-primary), var(--monet-secondary));
}

.style-preview.kandinsky {
  background: linear-gradient(45deg, var(--kandinsky-primary), var(--kandinsky-secondary));
}

.style-preview.hokusai {
  background: linear-gradient(45deg, var(--hokusai-primary), var(--hokusai-secondary));
}

.style-name {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

.style-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

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

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

.range-input {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--color-surface-secondary);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
}

.range-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--gradient-neural-primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration-normal) var(--ease-neural);
}

.range-input::-webkit-slider-thumb:hover {
  box-shadow: var(--shadow-glow-sm);
}

.range-input::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--gradient-neural-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration-normal) var(--ease-neural);
}

.range-input::-moz-range-thumb:hover {
  box-shadow: var(--shadow-glow-sm);
}

.control-value {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: right;
}

/* === BOOK CONTAINER === */

.book-container {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 200px);
  padding: var(--space-fluid-md);
}

.three-canvas {
  width: var(--book-width);
  height: var(--book-height);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  background: var(--color-surface-primary);
  cursor: grab;
}

.three-canvas:active {
  cursor: grabbing;
}

.book-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  margin-top: var(--space-8);
  padding: var(--space-4) var(--space-6);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-2xl);
}

.control-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  font-size: var(--font-size-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
  position: relative;
  overflow: hidden;
}

.control-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-neural-primary);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-neural);
  z-index: -1;
}

.control-btn:not(:disabled):hover::before {
  opacity: 1;
}

.control-btn:not(:disabled):hover {
  border-color: transparent;
  box-shadow: var(--shadow-glow-sm);
}

.control-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.page-indicator {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* === HOTSPOTS OVERLAY === */

.hotspots-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: var(--z-popover);
}

.hotspot {
  position: absolute;
  width: var(--hotspot-size);
  height: var(--hotspot-size);
  background: var(--color-neural-accent);
  border: 2px solid white;
  border-radius: 50%;
  cursor: pointer;
  pointer-events: auto;
  animation: hotspotPulse var(--hotspot-pulse-duration) ease-in-out infinite;
  transition: transform var(--duration-normal) var(--ease-neural);
}

.hotspot:hover {
  transform: scale(1.2);
}

@keyframes hotspotPulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.7);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(245, 158, 11, 0);
  }
}

/* === MEMORY MODAL === */

.memory-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-neural);
}

.memory-modal[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-bg-modal);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  width: 500px;
  background: var(--color-surface-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--duration-normal) var(--ease-elastic);
}

.memory-modal[aria-hidden="false"] .modal-content {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border-primary);
  background: var(--glass-bg);
}

.modal-title {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.modal-close:hover {
  background: var(--color-surface-secondary);
  color: var(--color-text-primary);
}

.modal-body {
  padding: var(--space-6);
  max-height: 60vh;
  overflow-y: auto;
}

/* === PROCESSING OVERLAY === */

.processing-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-neural);
}

.processing-overlay[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.processing-content {
  text-align: center;
  max-width: 400px;
  padding: var(--space-8);
}

.processing-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid var(--color-surface-secondary);
  border-top: 4px solid var(--color-neural-primary);
  border-radius: 50%;
  margin: 0 auto var(--space-6);
  animation: spin 1s linear infinite;
}

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

.processing-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

/* === SETTINGS PANEL === */

.settings-panel {
  position: fixed;
  right: var(--space-6);
  top: 50%;
  transform: translateY(-50%) translateX(100%);
  width: 320px;
  max-height: 80vh;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  z-index: var(--z-fixed);
  overflow-y: auto;
  transition: transform var(--duration-normal) var(--ease-neural);
}

.settings-panel.open {
  transform: translateY(-50%) translateX(0);
}

.settings-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.setting-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
}

.setting-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

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

.toggle-input {
  width: 48px;
  height: 24px;
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-full);
  position: relative;
  cursor: pointer;
  appearance: none;
  transition: all var(--duration-normal) var(--ease-neural);
}

.toggle-input::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--color-text-primary);
  border-radius: 50%;
  transition: all var(--duration-normal) var(--ease-neural);
}

.toggle-input:checked {
  background: var(--color-neural-primary);
  border-color: var(--color-neural-primary);
}

.toggle-input:checked::before {
  transform: translateX(24px);
}

.select-input {
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
}

/* === EXPORT MODAL === */

.export-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-neural);
}

.export-modal[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.export-modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  width: 800px;
  background: var(--color-surface-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--duration-normal) var(--ease-elastic);
}

.export-modal[aria-hidden="false"] .export-modal-content {
  transform: scale(1);
}

.export-modal-body {
  padding: var(--space-6);
  max-height: 70vh;
  overflow-y: auto;
}

.export-section {
  margin-bottom: var(--space-8);
}

.export-section-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border-secondary);
}

.export-type-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-3);
}

.export-type-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface-secondary);
  border: 2px solid var(--color-border-secondary);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.export-type-btn.active {
  border-color: var(--color-neural-primary);
  background: rgba(99, 102, 241, 0.1);
  box-shadow: var(--shadow-glow-sm);
}

.export-type-icon {
  font-size: var(--font-size-2xl);
}

.export-type-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-align: center;
}

.format-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-3);
}

.format-option {
  display: block;
  padding: var(--space-3);
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-secondary);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.format-option:has(input:checked) {
  border-color: var(--color-neural-primary);
  background: rgba(99, 102, 241, 0.1);
}

.format-option input {
  display: none;
}

.format-label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.format-label strong {
  color: var(--color-text-primary);
}

.format-label small {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

.quality-preset-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.quality-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-3);
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.quality-btn.active {
  border-color: var(--color-neural-primary);
  background: rgba(99, 102, 241, 0.1);
}

.quality-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.quality-specs {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.quality-slider-group {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.quality-slider-label {
  flex-shrink: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.quality-slider {
  flex: 1;
}

.style-export-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
}

.checkbox-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.checkbox-option input {
  width: 18px;
  height: 18px;
  accent-color: var(--color-neural-primary);
}

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

.filename-input {
  width: 100%;
  padding: var(--space-3);
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-3);
}

.naming-templates {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.template-btn {
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-interactive);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.template-btn:hover {
  background: var(--color-neural-primary);
  color: var(--color-text-primary);
}

.export-preview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface-secondary);
  border-radius: var(--radius-lg);
}

.preview-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.preview-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

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

.export-modal-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-6);
  border-top: 1px solid var(--color-border-primary);
  background: var(--glass-bg);
}

.export-actions-left,
.export-actions-right {
  display: flex;
  gap: var(--space-3);
}

.export-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.export-btn.primary {
  background: var(--gradient-neural-primary);
  border: none;
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

.export-btn.primary:hover {
  box-shadow: var(--shadow-glow-sm);
  transform: translateY(-2px);
}

.export-btn.secondary {
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-primary);
  color: var(--color-text-secondary);
}

.export-btn.secondary:hover {
  background: var(--color-surface-interactive);
  color: var(--color-text-primary);
}

/* === SHARE MODAL === */

.share-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-neural);
}

.share-modal[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.share-modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  width: 600px;
  background: var(--color-surface-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--duration-normal) var(--ease-elastic);
}

.share-modal[aria-hidden="false"] .share-modal-content {
  transform: scale(1);
}

.share-modal-body {
  padding: var(--space-6);
}

.share-preview-container {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-6);
}

.share-preview-canvas {
  max-width: 300px;
  max-height: 200px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.share-options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.share-option-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-secondary);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.share-option-btn:hover {
  background: var(--color-surface-interactive);
  border-color: var(--color-neural-primary);
  box-shadow: var(--shadow-glow-sm);
}

.share-option-icon {
  font-size: var(--font-size-xl);
}

.share-option-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.share-link-section {
  border-top: 1px solid var(--color-border-secondary);
  padding-top: var(--space-4);
}

.share-link-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.share-link-container {
  display: flex;
  gap: var(--space-2);
}

.share-link-input {
  flex: 1;
  padding: var(--space-3);
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.copy-link-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-3);
  background: var(--color-neural-primary);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.copy-link-btn:hover {
  background: var(--color-neural-secondary);
  box-shadow: var(--shadow-glow-sm);
}

/* === ADVANCED STYLE CONTROLS === */

.advanced-style-controls {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-secondary);
}

.control-section-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
}

.style-parameters {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

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

.parameter-label {
  flex-shrink: 0;
  width: 120px;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.style-parameter-input {
  flex: 1;
}

.parameter-value {
  flex-shrink: 0;
  width: 40px;
  text-align: right;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.blending-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.secondary-style-select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.blend-weight-control {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.blend-weight-control label {
  flex-shrink: 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.preset-buttons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
}

.preset-btn {
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-secondary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.preset-btn:hover {
  background: var(--color-neural-primary);
  color: var(--color-text-primary);
}

.style-preview-canvas {
  width: 100%;
  max-width: 200px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin: var(--space-4) auto;
  display: block;
}

/* === BATCH PROCESSING === */

.batch-processing-section {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-secondary);
}

.batch-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.batch-btn {
  padding: var(--space-3) var(--space-4);
  background: var(--gradient-neural-secondary);
  border: none;
  border-radius: var(--radius-lg);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.batch-btn:hover {
  box-shadow: var(--shadow-glow-sm);
  transform: translateY(-2px);
}

.batch-progress {
  padding: var(--space-4);
  background: var(--color-surface-secondary);
  border-radius: var(--radius-lg);
}

.batch-progress .progress-bar {
  margin-bottom: var(--space-2);
}

#batch-progress-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-align: center;
}

/* === STYLE HISTORY === */

.style-history-section {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-secondary);
}

.style-history-list {
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: var(--space-4);
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
}

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

.history-time {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.history-apply-btn {
  padding: var(--space-1) var(--space-2);
  background: var(--color-neural-primary);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-neural);
}

.history-apply-btn:hover {
  background: var(--color-neural-secondary);
}

.clear-history-btn {
  width: 100%;
  padding: var(--space-2);
  background: var(--color-error);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.clear-history-btn:hover {
  background: color-mix(in srgb, var(--color-error) 80%, black);
}

/* === NOTIFICATIONS === */

.update-notification,
.share-notification {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  background: var(--color-surface-primary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-toast);
  animation: slideIn 0.3s ease-out;
}

.share-notification.error {
  border-color: var(--color-error);
  background: rgba(239, 68, 68, 0.1);
}

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

.notification-content button {
  padding: var(--space-2) var(--space-3);
  background: var(--color-neural-primary);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* === RESPONSIVE UPDATES === */

@media (max-width: 768px) {
  .export-modal-content {
    width: 95vw;
    max-height: 95vh;
  }
  
  .export-type-grid {
    grid-template-columns: 1fr;
  }
  
  .format-grid {
    grid-template-columns: 1fr;
  }
  
  .quality-preset-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .export-actions-left,
  .export-actions-right {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .export-modal-footer {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .parameter-control {
    flex-direction: column;
    align-items: stretch;
  }
  
  .parameter-label {
    width: auto;
  }
  
  .blend-weight-control {
    flex-direction: column;
    align-items: stretch;
  }
}

.error-boundary {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 400px;
  padding: var(--space-8);
  background: var(--color-surface-primary);
  border: 2px solid var(--color-error);
  border-radius: var(--radius-2xl);
  text-align: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-neural);
}

.error-boundary[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.error-title {
  color: var(--color-error);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-4);
}

.error-message {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.error-retry {
  background: var(--color-error);
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-6);
  color: white;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-neural);
}

.error-retry:hover {
  background: color-mix(in srgb, var(--color-error) 80%, black);
  transform: translateY(-2px);
}

/* === PERFORMANCE MONITOR === */

.performance-monitor {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-family: var(--font-secondary);
  font-size: var(--font-size-xs);
  background: rgba(0, 0, 0, 0.8);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  z-index: var(--z-tooltip);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-neural);
}

.performance-monitor[aria-hidden="false"] {
  opacity: 1;
}

.perf-item {
  color: var(--color-text-muted);
}

/* === FOCUS MANAGEMENT === */

*:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

/* === ANIMATIONS === */

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

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideDown {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes scaleIn {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* === REDUCED MOTION === */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}