/* === App Layout === */
#app {
  position: relative;
  z-index: 1;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === Main Container === */
#main-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-sm);
  z-index: 1;
}

/* Keep map full width while sidebar is hidden */
#main-container.fullwidth #track-sidebar {
  visibility: hidden;
}

#main-container.fullwidth #placeholder,
#main-container.fullwidth #dual-view,
#main-container.fullwidth #single-view {
  width: 100%;
}

/* === Placeholder (Landing Page) === */
#placeholder {
  width: 100%;
  height: 100%;
}

/* === About Panel === */
#about-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 99;
}

#about-overlay.open {
  opacity: 1;
  visibility: visible;
}

#about-panel {
  position: fixed;
  top: 0;
  right: -450px;
  width: 420px;
  height: 100%;
  background: var(--bg-primary);
  border-left: 1px solid var(--border-subtle);
  transition: right var(--transition-slow);
  z-index: 100;
  overflow-y: auto;
}

#about-panel.open {
  right: 0;
}

.close-btn {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-normal);
  z-index: 10;
}

.close-btn:hover {
  background: var(--accent-danger);
  border-color: var(--accent-danger);
  color: white;
}

.about-content {
  padding: var(--space-2xl);
}

.about-header {
  text-align: center;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border-subtle);
}

.about-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
  border-radius: 20px;
  font-size: 2rem;
  color: white;
  animation: spin-slow 20s linear infinite;
}

.about-header h2 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.about-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.about-section {
  margin-bottom: var(--space-xl);
}

.about-section h3 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--accent-primary);
  margin-bottom: var(--space-md);
}

.about-section p {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.shortcuts-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.shortcut {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border-radius: 8px;
}

.shortcut kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 60px;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-primary);
}

.shortcut span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.about-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}

.version {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* === Status Toast === */
.status-toast {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--surface-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  z-index: 50;
}

.status-toast i {
  color: var(--accent-primary);
}

/* === Responsive === */
@media (max-width: 1200px) {
  .placeholder-grid {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(400px, 50vh) auto;
    overflow-y: auto;
  }

  .col-left {
    min-height: 400px;
    max-height: 50vh;
  }

  .col-right {
    max-height: none;
    overflow: visible;
  }

  .example-grid {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, minmax(120px, 1fr));
  }

  .nav-btn {
    min-width: 120px;
    padding: var(--space-xs) var(--space-sm);
  }
  
  .nav-btn-text {
    display: none;
  }
  
  .nav-btn-value {
    max-width: 80px;
  }
}

@media (max-width: 1100px) {
  #controls {
    flex-wrap: wrap;
  }

  .navbar-left {
    width: 100%;
    justify-content: center;
  }

  .navbar-right {
    width: 100%;
    justify-content: center;
  }
  
  .nav-dropdown {
    right: auto;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
  }
  
  .nav-dropdown.open {
    transform: translateX(-50%) translateY(0);
  }
}

@media (max-width: 900px) {
  #navbar {
    padding: var(--space-sm);
  }

  .site-title {
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
  }

  .title-text, .title-accent {
    font-size: 0.7rem;
  }

  .nav-buttons {
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-btn {
    min-width: 100px;
    font-size: 0.75rem;
  }
  
  .nav-btn > i:first-child {
    font-size: 0.85rem;
  }

  .player-panel {
    flex-wrap: wrap;
    gap: var(--space-sm);
    justify-content: center;
  }

  #dual-view {
    flex-direction: column;
  }

  .image-frame {
    max-width: 100%;
  }

  .example-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .nav-btn {
    min-width: 80px;
    padding: var(--space-xs);
  }
  
  .nav-btn-value {
    max-width: 50px;
    font-size: 0.7rem;
  }
  
  .nav-dropdown {
    min-width: 250px;
    max-width: calc(100vw - 20px);
  }
}

/* === 3D Viewer Overlay === */
#viewer-3d-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-deep);
  z-index: 200;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

#viewer-3d-overlay.open {
  opacity: 1;
  visibility: visible;
}

.viewer-3d-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-lg);
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.viewer-3d-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.viewer-3d-title i {
  font-size: 1.1rem;
}

.viewer-3d-controls {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.viewer-3d-frame {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.viewer-3d-frame span {
  color: var(--accent-primary);
  font-weight: 600;
}

.close-3d-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.close-3d-btn:hover {
  background: var(--accent-danger);
  border-color: var(--accent-danger);
  color: white;
}

#viewer-3d-iframe {
  flex: 1;
  width: 100%;
  height: 100%;
  background: var(--bg-deep);
}

  .main-img {
    object-fit: contain !important;
    width: 100%;
    height:100%;
  }

/* === Material Design 3D Viewer Loading Spinner === */
.viewer-3d-loader {
  position: absolute;
  inset: 0;
  top: 50px; /* Account for header */
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-deep);
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.viewer-3d-loader.visible {
  opacity: 1;
  visibility: visible;
}

.loader-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.material-spinner {
  width: 64px;
  height: 64px;
  animation: rotate 2s linear infinite;
}

.material-spinner svg {
  width: 100%;
  height: 100%;
}

.material-spinner circle {
  stroke: var(--accent-primary);
  stroke-linecap: round;
  animation: dash 1.5s ease-in-out infinite;
  transform-origin: center;
}

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

@keyframes dash {
  0% {
    stroke-dasharray: 1, 150;
    stroke-dashoffset: 0;
  }
  50% {
    stroke-dasharray: 90, 150;
    stroke-dashoffset: -35;
  }
  100% {
    stroke-dasharray: 90, 150;
    stroke-dashoffset: -124;
  }
}

.loader-text {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  animation: pulse-text 1.5s ease-in-out infinite;
}

@keyframes pulse-text {
  0%, 100% {
    opacity: 0.6;
  }
  50% {
    opacity: 1;
  }
}

/* === Hidden States === */
#player-controls[style*="none"],
#progress-wrapper[style*="none"],
#dual-view[style*="none"],
#single-view[style*="none"],
#placeholder[style*="none"] {
  display: none !important;
}