:root {
  --bg-primary: #f5f5f5;
  --bg-secondary: #fff;
  --bg-tertiary: #e9ecef;
  --text-primary: #333;
  --text-secondary: #666;
  --border-color: #ddd;
  --border-color-dark: #ccc;
  --canvas-shadow: rgba(0,0,0,0.1);
  --status-bg: #333;
  --status-text: #fff;
  --status-kbd: #555;
  --display-mode-bg: #d4edda;
  --display-mode-text: #155724;
  --grid-line: #ddd;
}

body.dark-mode {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #3d3d3d;
  --text-primary: #e0e0e0;
  --text-secondary: #aaa;
  --border-color: #444;
  --border-color-dark: #555;
  --canvas-shadow: rgba(0,0,0,0.4);
  --status-bg: #111;
  --status-text: #e0e0e0;
  --status-kbd: #444;
  --display-mode-bg: #1e4620;
  --display-mode-text: #90ee90;
  --grid-line: #444;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  height: 100dvh; /* Dynamic viewport height - accounts for mobile browser chrome */
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.toolbar button {
  padding: 8px 16px;
  border: 1px solid var(--border-color-dark);
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s;
}

.toolbar button:hover {
  background: var(--bg-tertiary);
}

.toolbar button.active {
  background: #007bff;
  color: #fff;
  border-color: #007bff;
}

.toolbar .separator {
  width: 1px;
  height: 24px;
  background: var(--border-color);
  margin: 0 4px;
}

.toolbar .spacer {
  flex: 1;
}

.toolbar .mode-indicator {
  font-weight: bold;
  padding: 8px 12px;
  border-radius: 4px;
  background: var(--bg-tertiary);
}

.toolbar .mode-indicator.display-mode {
  background: var(--display-mode-bg);
  color: var(--display-mode-text);
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.zoom-controls button {
  padding: 8px 12px;
  min-width: 36px;
}

.zoom-controls .zoom-label {
  min-width: 50px;
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
}

.canvas-container {
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 20px;
  overflow: auto;
}

#canvas {
  background: var(--bg-secondary);
  box-shadow: 0 2px 10px var(--canvas-shadow);
  cursor: crosshair;
}

.palette-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  flex-shrink: 0;
}

.color-swatch {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border-color-dark);
  border-radius: 4px;
  cursor: pointer;
  transition: transform 0.1s;
}

.color-swatch:hover {
  transform: scale(1.1);
}

.color-swatch.selected {
  border-color: #007bff;
  box-shadow: 0 0 0 2px rgba(0,123,255,0.5);
}

.add-color-btn {
  width: 32px;
  height: 32px;
  border: 2px dashed var(--border-color-dark);
  border-radius: 4px;
  background: var(--bg-secondary);
  cursor: pointer;
  font-size: 20px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.add-color-btn:hover {
  border-color: #007bff;
  color: #007bff;
}

.palette-bar .selected-info {
  margin-left: 16px;
  color: var(--text-secondary);
}

.status-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  background: var(--status-bg);
  color: var(--status-text);
  font-size: 13px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.status-bar kbd {
  background: var(--status-kbd);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: monospace;
}

/* Modal styles */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 24px;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  min-width: 300px;
}

.modal h2 {
  margin-bottom: 16px;
}

.modal .form-group {
  margin-bottom: 16px;
}

.modal label {
  display: block;
  margin-bottom: 4px;
  font-weight: 500;
}

.modal input[type="number"] {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--border-color-dark);
  border-radius: 4px;
  font-size: 14px;
  background: var(--bg-primary);
  color: var(--text-primary);
}

.modal .button-row {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 20px;
}

.modal button {
  padding: 8px 16px;
  border: 1px solid var(--border-color-dark);
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal button.primary {
  background: #007bff;
  color: #fff;
  border-color: #007bff;
}

.modal button.primary:hover {
  background: #0056b3;
}

/* Hidden file inputs */
#file-input,
#part-file-input {
  display: none;
}

/* Hidden color picker */
#color-picker {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

/* Parts modal */
.modal.wide {
  min-width: 400px;
  max-width: 500px;
}

.modal input[type="text"] {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--border-color-dark);
  border-radius: 4px;
  font-size: 14px;
  background: var(--bg-primary);
  color: var(--text-primary);
}

.parts-list {
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  margin-bottom: 16px;
}

.parts-list-empty {
  padding: 16px;
  text-align: center;
  color: var(--text-secondary);
  font-style: italic;
}

.part-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
}

.part-item:last-child {
  border-bottom: none;
}

.part-item .part-name {
  flex: 1;
  font-weight: 500;
}

.part-item .part-info {
  color: var(--text-secondary);
  font-size: 13px;
}

.part-item button {
  padding: 4px 8px;
  font-size: 12px;
}

.part-add-form {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

.part-add-form .form-group {
  margin-bottom: 0;
  flex: 1;
}

.part-indicator {
  font-weight: bold;
  padding: 4px 8px;
  border-radius: 4px;
  background: #17a2b8;
  color: #fff;
  font-size: 13px;
  margin-right: 8px;
}

/* Mobile navigation controls */
.mobile-nav {
  display: none;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  justify-content: center;
  flex-shrink: 0;
}

.mobile-nav-btn {
  padding: 12px 16px;
  min-width: 70px;
  min-height: 44px;
  border: 1px solid var(--border-color-dark);
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  touch-action: manipulation;
}

.mobile-nav-btn:active {
  background: var(--bg-tertiary);
}

/* Hide part buttons when no parts exist */
.mobile-nav.no-parts #btn-prev-part,
.mobile-nav.no-parts #btn-next-part {
  display: none;
}

/* Mobile styles */
@media (max-width: 600px) {
  /* Toolbar adjustments */
  .toolbar {
    padding: 8px 12px;
    gap: 6px;
  }

  .toolbar button {
    padding: 8px 10px;
    font-size: 13px;
    min-height: 44px;
  }

  .toolbar .separator {
    display: none;
  }

  .toolbar .spacer {
    flex-basis: 100%;
    height: 0;
  }

  .toolbar .mode-indicator {
    padding: 6px 10px;
    font-size: 13px;
  }

  /* Zoom controls */
  .zoom-controls button {
    padding: 8px 10px;
    min-width: 44px;
    min-height: 44px;
  }

  .zoom-controls .zoom-label {
    min-width: 40px;
    font-size: 12px;
  }

  /* Canvas container */
  .canvas-container {
    padding: 12px;
  }

  /* Palette bar */
  .palette-bar {
    padding: 10px 12px;
    gap: 6px;
  }

  .color-swatch {
    width: 36px;
    height: 36px;
  }

  .add-color-btn {
    width: 36px;
    height: 36px;
  }

  .palette-bar .selected-info {
    display: none;
  }

  /* Status bar - hide keyboard hints on mobile */
  .status-bar {
    padding: 8px 12px;
    gap: 8px;
  }

  .status-bar .keyboard-hint {
    display: none;
  }

  /* Modal adjustments */
  .modal {
    margin: 16px;
    min-width: auto;
    width: calc(100vw - 32px);
    max-width: 400px;
    max-height: calc(100dvh - 32px);
    overflow-y: auto;
  }

  .modal.wide {
    min-width: auto;
    max-width: calc(100vw - 32px);
  }

  .modal button {
    min-height: 44px;
  }

  /* Import modal uses full screen - override margin */
  #modal-import .modal {
    margin: 0;
  }

  .part-add-form {
    flex-wrap: wrap;
  }

  .part-add-form .form-group {
    flex-basis: 100%;
  }

  .part-add-form button {
    flex: 1;
  }

  /* Import modal mobile - full screen for maximum usability */
  .import-modal {
    width: 100vw;
    max-width: 100vw;
    height: 100dvh;
    max-height: 100dvh;
    margin: 0;
    border-radius: 0;
    padding: 16px;
    display: flex;
    flex-direction: column;
  }

  .import-previews {
    flex-direction: column;
    flex: 1;
    min-height: 0;
    gap: 12px;
  }

  .import-preview-panel {
    flex: 1;
    min-height: 0;
  }

  .import-preview-panel canvas {
    max-height: 35vh;
  }

  .import-controls {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
    flex-shrink: 0;
  }

  .import-controls .form-group {
    min-width: 0;
    flex: 1 1 45%;
  }

  .import-controls .import-lock-group {
    flex: 1 1 100%;
  }

  .import-modal .button-row {
    flex-shrink: 0;
  }

  /* Show mobile nav in display mode */
  .mobile-nav.visible {
    display: flex;
  }

  /* Hide palette bar in display mode on mobile */
  body.display-mode .palette-bar {
    display: none;
  }
}

/* Import photo modal */
.import-modal {
  width: 92vw;
  max-width: 1100px;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
}

.import-modal h2 {
  flex-shrink: 0;
}

.import-previews {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  flex: 1;
  min-height: 0;
}

.import-preview-panel {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.import-preview-panel label {
  display: block;
  margin-bottom: 4px;
  font-weight: 500;
  font-size: 13px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.import-preview-panel canvas {
  max-width: 100%;
  max-height: 60vh;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: var(--bg-primary);
  cursor: crosshair;
}

.import-controls {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
  flex-shrink: 0;
}

.import-controls .form-group {
  margin-bottom: 8px;
  flex: 1;
  min-width: 100px;
}

.import-modal .button-row {
  flex-shrink: 0;
}

.import-lock-group {
  display: flex;
  align-items: center;
  min-width: 140px !important;
}

.import-lock-group label {
  display: flex !important;
  align-items: center;
  gap: 6px;
  font-weight: normal !important;
  white-space: nowrap;
  cursor: pointer;
}

.import-lock-group input[type="checkbox"] {
  width: auto;
  margin: 0;
}

#import-file-input {
  display: none;
}

/* PDF page navigation */
.import-page-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 12px;
}

.import-page-nav button {
  padding: 8px 16px;
  border: 1px solid var(--border-color-dark);
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  min-height: 44px;
}

.import-page-nav button:hover {
  background: var(--bg-tertiary);
}

.import-page-nav button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#page-indicator {
  font-size: 14px;
  color: var(--text-secondary);
  min-width: 100px;
  text-align: center;
}

/* Touch-friendly canvas */
@media (pointer: coarse) {
  #canvas {
    cursor: pointer;
  }
}

/* Prevent browser touch handling on canvas */
#canvas {
  touch-action: none;
}

/* Status bar link */
.status-link {
  margin-left: auto;
  color: var(--status-text);
  opacity: 0.6;
  text-decoration: none;
  font-size: 12px;
}

.status-link:hover {
  opacity: 1;
}