/**
 * Main Stylesheet for Texture reCreator - Split Screen Layout
 * Modern, professional design with sidebar and large preview area
 */

:root {
  /* Colors - Light Theme */
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-sidebar: #2c3e50;
  --bg-glass: rgba(255, 255, 255, 0.95);
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --text-sidebar: #ecf0f1;
  --text-sidebar-muted: #bdc3c7;
  --accent-primary: #3498db;
  --accent-hover: #2980b9;
  --accent-secondary: #e74c3c;
  --border-color: rgba(0, 0, 0, 0.1);
  --border-sidebar: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  background: var(--bg-primary);
}

.app-layout { display: flex; height: 100vh; width: 100vw; }

.sidebar {
  width: 320px;
  min-width: 320px;
  background: var(--bg-sidebar);
  color: var(--text-sidebar);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  z-index: 100;
  overflow: hidden;
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-lg);
}

.sidebar-content::-webkit-scrollbar { width: 8px; }
.sidebar-content::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.05); }
.sidebar-content::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.2); border-radius: 4px; }
.sidebar-content::-webkit-scrollbar-thumb:hover { background: rgba(255, 255, 255, 0.3); }

.sidebar-header {
  margin-bottom: var(--spacing-xl);
  text-align: center;
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-sidebar);
}

.sidebar-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-sidebar);
}

.sidebar-header .subtitle {
  font-size: 0.85rem;
  color: var(--text-sidebar-muted);
}

.control-group {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-sidebar);
}

.control-group:last-of-type { border-bottom: none; }

.group-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-sidebar);
  margin-bottom: var(--spacing-md);
}

.group-title svg { flex-shrink: 0; color: var(--accent-primary); }

.btn-primary {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active { transform: translateY(0); }

.hint {
  margin-top: var(--spacing-sm);
  font-size: 0.8rem;
  color: var(--text-sidebar-muted);
  text-align: center;
}

.control-item { margin-bottom: var(--spacing-md); }

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  font-size: 0.85rem;
  color: var(--text-sidebar-muted);
}

.control-value {
  font-weight: 700;
  color: var(--accent-primary);
  font-size: 0.9rem;
}

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.1);
  outline: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  transition: all 0.2s ease;
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 0 6px rgba(52, 152, 219, 0.2);
}

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.link-control { margin-top: var(--spacing-md); }
.link-control input[type='checkbox'] { display: none; }

.link-button {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-sidebar);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.85rem;
}

.link-button:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-primary);
}

.link-control input:checked + .link-button {
  background: rgba(52, 152, 219, 0.2);
  border-color: var(--accent-primary);
}

.link-icon { width: 24px; height: 24px; }

.pattern-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-sm);
}

.pattern-option input[type='radio'] { display: none; }

.pattern-option label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid var(--border-sidebar);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
}

.pattern-option label:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-primary);
}

.pattern-option input:checked + label {
  background: rgba(52, 152, 219, 0.2);
  border-color: var(--accent-primary);
}

.pattern-option label img {
  width: 100%;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.pattern-option label span {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-sidebar-muted);
}

.pattern-option input:checked + label span { color: var(--accent-primary); }

.mode-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.mode-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid var(--border-sidebar);
  border-radius: var(--radius-md);
  color: var(--text-sidebar-muted);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.9rem;
  font-weight: 500;
}

.mode-option:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-primary);
  color: var(--text-sidebar);
}

.mode-option.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

.mode-option svg { flex-shrink: 0; }

.btn-download {
  display: block;
  text-align: center;
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid var(--border-sidebar);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-sidebar);
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-download:hover {
  background: rgba(231, 76, 60, 0.2);
  border-color: var(--accent-secondary);
}

.btn-download img {
  width: 100%;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-sm);
}

.btn-download span {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
}

.sidebar-footer {
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  border-top: 1px solid var(--border-sidebar);
  text-align: center;
}

.sidebar-footer p {
  font-size: 0.75rem;
  color: var(--text-sidebar-muted);
}

.sidebar-footer a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.sidebar-footer a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.preview-area {
  flex: 1;
  position: relative;
  background: var(--bg-primary);
  overflow: hidden;
}

.preview-wrapper {
  width: 100%;
  height: 100%;
  position: relative;
}

.threejs-preview {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #e8ecef 0%, #f5f7fa 100%);
}

.threejs-preview canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.preview-info-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  padding: var(--spacing-lg);
  pointer-events: none;
}

.preview-info-overlay p {
  margin: 0;
  color: white;
  font-size: 0.9rem;
  font-weight: 500;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.loading-indicator {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 9999;
  display: none;
}

.loading-indicator.active { display: block; }

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.error-message {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  background: var(--accent-secondary);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 10000;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { transform: translateX(400px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@media (max-width: 1024px) {
  .sidebar { width: 280px; min-width: 280px; }
}

@media (max-width: 768px) {
  .app-layout { flex-direction: column; }
  .sidebar { width: 100%; min-width: 100%; max-height: 40vh; }
  .sidebar-content { padding: var(--spacing-md); }
  .preview-area { 
    height: 60vh; 
    min-height: 200px;
    /* Ensure background image is visible on mobile */
    background-size: auto !important;
  }
  
  /* Improve touch targets on mobile */
  .btn-primary {
    min-height: 48px;
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .mode-option {
    min-height: 44px;
  }
}

@media (max-width: 480px) {
  .sidebar-header h1 { font-size: 1.25rem; }
  .pattern-options { grid-template-columns: 1fr; }
}

/* Touch active state for mobile */
.touch-active {
  opacity: 0.95;
}

/* Drag over visual feedback */
.drag-over {
  outline: 3px dashed var(--accent-primary);
  outline-offset: -3px;
}