:root {
  /* Light mode colors */
  --bg-light: #f8f8f8;
  --primary-light: #fff;
  --secondary-light: #f0f0f0;
  --hover-light: #e0e0e0;
  --border-light: #000000;
  --text-light: #333;
  --shadow-light: rgba(0, 0, 0, 0.1);

  /* Dark mode colors */
  --bg-dark: #222;
  --primary-dark: #333;
  --secondary-dark: #444;
  --hover-dark: #555;
  --border-dark: #ffffff;
  --text-dark: #f0f0f0;

  /* Accent colors */
  --accent-primary: #4CAF50;
  --accent-hover: #45a049;
  --accent-focus: #4CAF50;
  --focus-shadow: rgba(76, 175, 80, 0.3);

  /* Spacing */
  --spacing-xs: 2px;
  --spacing-sm: 5px;
  --spacing-md: 10px;
  --spacing-lg: 20px;

  /* Sizing */
  --min-touch-target: 44px;
  --icon-size: 24px;


  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;

  /* Border radius */
  --radius-sm: 3px;
  --radius-md: 4px;
  --radius-lg: 5px;
  --radius-round: 50%;
}

/* ========================================
   BASE STYLES & RESETS
   ======================================== */

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background-color: var(--bg-light);
  color: var(--text-light);
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   LAYOUT COMPONENTS
   ======================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

.header {
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.dark-mode-toggle-container {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  align-items: right;
  gap: var(--spacing-sm);
}

.main-content {
  display: flex;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

.canvas-area {
  flex: 0 0 800px;
  width: 80%;
}

.working-area {
  flex: 1;
  display: flex;
  flex-direction: row;
  gap: var(--spacing-lg);
}

.controls-area {
  flex: 1;
  width: 225px;
}

.tools-area {
  flex: 1;
  display: flex;
  flex-direction: row;
  gap: var(--spacing-lg);
}

/* ========================================
   CANVAS
   ======================================== */

canvas {
  display: block;
  margin: 0 auto;
  background-color: var(--primary-light);
}

#canvas-container {
  margin: var(--spacing-lg) 0 var(--spacing-md);
  width: 800px;
  height: 600px;
  position: relative;
  overflow: auto;
}

#canvas-info {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md);
  background: var(--secondary-light);
  border-radius: var(--radius-md);
}

/* ========================================
   BUTTONS & INTERACTIVE ELEMENTS
   ======================================== */

/* Base button styles */
.btn,
.icon-button,
.row-button,
.color-action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--secondary-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 12px;
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
}

.btn:hover,
.icon-button:hover,
.row-button:hover,
.color-action-button:hover {
  background-color: var(--hover-light);
}

.icon-button {
  width: 40px;
  height: 35px;
  font-size: 15px;
}

.row-button {
  width: 35px;
  height: 30px;
  font-size: 15px;
}


.icon-button:hover,
.row-button:hover {
  transform: scale(1.1);
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--accent-focus);
  outline-offset: 2px;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  box-shadow: 0 0 0 3px var(--focus-shadow);
}

/* ========================================
   TOOLBAR & CONTROLS
   ======================================== */

#main-toolbar,
.color-control-area,
.palette-container,
#working-color-container,
.controls-area,
.canvas-area {
  background-color: var(--primary-light);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: var(--spacing-md);
  box-shadow: 0 1px 3px var(--shadow-light);
  margin-bottom: var(--spacing-lg);
}


#main-toolbar {
  display: flex;
  flex-wrap: wrap;
  width: 250px;
  gap: var(--spacing-md);
  align-items: center;
}

.tool-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-right: 15px;
}

.tool-group-label {
  margin-right: 8px;
  font-size: 14px;
  white-space: nowrap;
}

#drag-tip {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 5px 10px;
  border-radius: 4px;
  font-size: 12px;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s;
}

/* ========================================
   TOGGLES
   ======================================== */

.toggle-container {
  display: flex;
  align-items: center;
  margin-left: var(--spacing-sm);
}

.toggle-label {
  margin-right: 8px;
  font-size: 14px;
}

.toggle {
  width: 40px;
  height: 20px;
  background-color: var(--secondary-light);
  border-radius: 10px;
  position: relative;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.toggle::after {
  content: '';
  width: 18px;
  height: 18px;
  background-color: var(--primary-light);
  border-radius: var(--radius-round);
  position: absolute;
  top: 1px;
  left: 1px;
  transition: all var(--transition-normal);
}

.toggle.active {
  background-color: var(--accent-primary);
}

.toggle.active::after {
  left: 21px;
}

body.dark-mode .toggle {
  background-color: var(--secondary-dark);
}

body.dark-mode .toggle::after {
  background-color: var(--text-dark);
}

body.dark-mode .toggle.active {
  background-color: var(--accent-primary);
}

/* ========================================
   COLOR CONTROLS
   ======================================== */

.color-control-area {
  display: flex;
  flex-direction: row;
  width: 60%;
  gap: var(--spacing-lg);
  align-items: flex-start;
  padding: 15px;
}

.color-swatch {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: transform 0.1s;
}

.color-swatch:hover {
  transform: scale(1.1);
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.2);
}

.color-swatch.selected {
  border: 2px solid var(--text-light);
}

/* Color sections */

#recent-colors-container,
#working-colors-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-width: 350px;
}

/* Working colors specific styles */
.working-color-control {
  display: flex;
  align-items: center;
  gap: 10px;
}

.working-color-control input[type="color"] {
  margin-right: 10px;
}

.working-color-control span {
  font-family: monospace;
}

.working-colors-controls {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.working-colors-empty-message {
  font-size: 12px;
  font-style: italic;
  color: #666;
}

.working-colors-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.working-color-item {
  position: relative;
  display: inline-block;
}

.working-color-item .color-swatch {
  width: 30px;
  height: 30px;
}

.working-color-item .color-actions {
  position: absolute;
  top: -5px;
  right: -5px;
}

.working-color-item .color-action-button {
  width: 16px;
  height: 16px;
  padding: 0;
  background-color: var(--primary-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-round);
  font-size: 10px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.working-color-item .color-action-button:hover {
  background-color: #ff4444;
  color: white;
  border-color: #ff4444;
}

/* ========================================
   PALETTE CONTROLS
   ======================================== */

.palette-container {
  display: flex;
  flex-direction: column;
  width: 300px;
  gap: var(--spacing-lg);
  align-items: flex-start;

}

.palette-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

#palette-select {
  flex: 1;
  min-width: 150px;
  padding: 6px var(--spacing-md);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background-color: var(--bg-light);
  font-size: 16px;
}

.palette-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.palette-swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.palette-swatches .color-swatch {
  width: 30px;
  height: 30px;
}

/* Import button styling */
/* ========================================
   ROW COLOR PICKERS
   ======================================== */

.row-color-picker {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.row-number {
  width: 50px;
  font-size: 12px;
}

.weft-pickers {
  display: flex;
  gap: var(--spacing-sm);
}

/* ========================================
   ICONS
   ======================================== */

.feather {
  width: var(--icon-size);
  height: var(--icon-size);
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

/* ========================================
   HEADINGS & TEXT
   ======================================== */

h3 {
  margin: 0 0 8px;
  font-size: 14px;
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

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

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: #000;
  color: #fff;
  padding: 8px;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 6px;
}

/* ========================================
   DARK MODE
   ======================================== */

body.dark-mode {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

body.dark-mode canvas,
body.dark-mode #main-toolbar,
body.dark-mode .palette-container,
body.dark-mode #working-color-container,
body.dark-mode .color-control-area,
body.dark-mode .controls-area,
body.dark-mode .canvas-area {
  background-color: var(--primary-dark);
  border-color: var(--border-dark);
}

body.dark-mode .btn,
body.dark-mode .icon-button,
body.dark-mode .row-button,
body.dark-mode .color-action-button {
  background-color: var(--secondary-dark);
  border-color: var(--border-dark);
  color: var(--text-dark);
}

body.dark-mode .btn:hover,
body.dark-mode .icon-button:hover,
body.dark-mode .row-button:hover,
body.dark-mode .color-action-button:hover {
  background-color: var(--hover-dark);
}

body.dark-mode #current-row-display,
body.dark-mode #canvas-info,
body.dark-mode .working-color-item {
  background-color: var(--secondary-dark);
}

body.dark-mode .color-swatch {
  border-color: var(--border-dark);
}

body.dark-mode .color-swatch.selected {
  border-color: var(--text-dark);
}

body.dark-mode #palette-select {
  background-color: var(--secondary-dark);
  border-color: var(--border-dark);
  color: var(--text-dark);
}

body.dark-mode .feather {
  stroke: var(--text-dark);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Tablet */
@media screen and (max-width: 1024px) {
  .canvas-area {
    flex: 2;
  }

  .controls-area {
    flex: 1;
    width: 250px;
  }
}

/* Mobile */
@media screen and (max-width: 768px) {
  .container {
    padding: var(--spacing-md);
    max-width: 100%;
  }

  .header h1 {
    font-size: 1.5rem;
    margin: 0.5rem 0;
  }

  #main-toolbar {
    justify-content: center;
  }

  .icon-button {
    min-width: 48px;
    min-height: 48px;
  }

  .row-button {
    min-width: 48px;
    min-height: 48px;
  }

  .main-content {
    flex-direction: column;
  }

  .canvas-area {
    order: 2;
    flex: 1 1 auto;
    margin-bottom: var(--spacing-lg);
  }

  .controls-area {
    order: 1;
    width: 100%;
  }

  #canvas-container {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .color-control-area {
    flex-direction: column;
  }

  .palette-controls {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  #palette-select,
  input[type="number"] {
    min-height: var(--min-touch-target);
    font-size: 16px;
    /* Prevents zoom on iOS */
    padding: 12px;
  }

  .color-swatch {
    min-width: 48px;
    min-height: 48px;
  }
}

/* Small mobile */
@media screen and (max-width: 480px) {
  .container {
    padding: 8px;
  }

  .header h1 {
    font-size: 1.25rem;
  }

  .icon-button,
  .row-button {
    min-width: var(--min-touch-target);
    min-height: var(--min-touch-target);
  }
}

/* Landscape mobile */
@media screen and (max-width: 768px) and (orientation: landscape) {
  .container {
    padding: 8px;
  }

  .main-content {
    flex-direction: row;
  }

  .controls-area {
    max-height: calc(100vh - 120px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .header h1 {
    font-size: 1.25rem;
    margin: 0.25rem 0;
  }
}

/* Touch devices */
@media (hover: none) and (pointer: coarse) {

  .icon-button:hover,
  .row-button:hover,
  .color-swatch:hover {
    transform: none;
  }


  .icon-button:active,
  .row-button:active,
  .color-swatch:active {
    transform: scale(0.95);
    opacity: 0.8;
  }

  button,
  input,
  select,
  .color-swatch {
    min-height: 48px;
    min-width: 48px;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {

  .icon-button,
  button,
  .color-swatch {
    border: 2px solid;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .icon-button:hover,
  .row-button:hover {
    transform: none;
  }
}

/* iOS Safari fixes */
@supports (-webkit-touch-callout: none) {
  .container {
    min-height: -webkit-fill-available;
  }
}

/* PWA standalone mode */
@media (display-mode: standalone) {
  .container {
    padding-top: env(safe-area-inset-top, 20px);
    padding-bottom: env(safe-area-inset-bottom, 20px);
    padding-left: env(safe-area-inset-left, 20px);
    padding-right: env(safe-area-inset-right, 20px);
  }
}

/* Print styles */
@media print {
  .container {
    max-width: none;
    padding: 0;
  }

  #main-toolbar,
  .controls-area {
    display: none;
  }

  .canvas-area {
    width: 100%;
  }

  #canvas-container {
    break-inside: avoid;
  }
}

/* ========================================
   ADDITIONAL STYLES
   ======================================== */

.error-notification {
  position: fixed;
  top: 20px;
  right: 20px;
  background: #f44336;
  color: white;
  padding: 12px 24px;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  font-family: Arial, sans-serif;
  font-size: 14px;
}

/* ========================================
   HELP MODAL STYLES
   ======================================== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: 1000px;
  max-height: 90vh;
  background-color: var(--primary-light);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
}

.modal:not(.active) .modal-content {
  transform: translate(-50%, -50%) scale(0.95);
}

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--hover-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.modal-header h2 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-light);
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--text-light);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: var(--min-touch-target);
  min-height: var(--min-touch-target);
}

.modal-close:hover {
  background-color: var(--hover-light);
}

.modal-close:focus {
  outline: 2px solid var(--accent-focus);
  outline-offset: 2px;
}

.modal-close .feather {
  width: var(--icon-size);
  height: var(--icon-size);
}

.modal-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Help Navigation */
.help-nav {
  flex-shrink: 0;
  width: 200px;
  background-color: var(--secondary-light);
  border-right: 1px solid var(--hover-light);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.help-tab {
  background: none;
  border: none;
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  cursor: pointer;
  color: var(--text-light);
  border-bottom: 1px solid var(--hover-light);
  transition: background-color var(--transition-fast);
  font-size: 0.9rem;
  min-height: var(--min-touch-target);
}

.help-tab:hover {
  background-color: var(--hover-light);
}

.help-tab.active {
  background-color: var(--accent-primary);
  color: white;
  font-weight: 500;
}

.help-tab:focus {
  outline: 2px solid var(--accent-focus);
  outline-offset: -2px;
}

/* Help Content */
.help-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
}

.help-panel {
  display: none;
}

.help-panel.active {
  display: block;
}

.help-panel h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-lg);
  color: var(--text-light);
  font-size: 1.4rem;
  font-weight: 600;
}

.help-panel h4 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--text-light);
  font-size: 1.1rem;
  font-weight: 500;
}

.help-panel p {
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
  color: var(--text-light);
}

.help-panel ul,
.help-panel ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.help-panel li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
  color: var(--text-light);
}

.help-panel li strong {
  color: var(--accent-primary);
  font-weight: 600;
}

.help-tip {
  background-color: var(--secondary-light);
  border-left: 4px solid var(--accent-primary);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.help-tip strong {
  color: var(--accent-primary);
  display: block;
  margin-bottom: var(--spacing-sm);
}

.help-tip ul {
  margin-bottom: 0;
  margin-top: var(--spacing-sm);
}

/* Dark Mode Styles for Modal */
[data-theme="dark"] .modal-content {
  background-color: var(--primary-dark);
}

[data-theme="dark"] .modal-header {
  border-bottom-color: var(--hover-dark);
}

[data-theme="dark"] .modal-header h2 {
  color: var(--text-dark);
}

[data-theme="dark"] .modal-close {
  color: var(--text-dark);
}

[data-theme="dark"] .modal-close:hover {
  background-color: var(--hover-dark);
}

[data-theme="dark"] .help-nav {
  background-color: var(--secondary-dark);
  border-right-color: var(--hover-dark);
}

[data-theme="dark"] .help-tab {
  color: var(--text-dark);
  border-bottom-color: var(--hover-dark);
}

[data-theme="dark"] .help-tab:hover {
  background-color: var(--hover-dark);
}

[data-theme="dark"] .help-panel h3,
[data-theme="dark"] .help-panel h4,
[data-theme="dark"] .help-panel p,
[data-theme="dark"] .help-panel li {
  color: var(--text-dark);
}

[data-theme="dark"] .help-tip {
  background-color: var(--secondary-dark);
}

/* Responsive Design for Modal */
@media (max-width: 768px) {
  .modal-content {
    width: 95%;
    max-height: 95vh;
  }

  .modal-body {
    flex-direction: column;
  }

  .help-nav {
    width: 100%;
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    flex-shrink: 0;
    max-height: 60px;
  }

  .help-tab {
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 120px;
    border-bottom: none;
    border-right: 1px solid var(--hover-light);
  }

  [data-theme="dark"] .help-tab {
    border-right-color: var(--hover-dark);
  }

  .help-content {
    padding: var(--spacing-md);
  }

  .modal-header {
    padding: var(--spacing-md);
  }

  .modal-header h2 {
    font-size: 1.3rem;
  }
}

@media (max-width: 480px) {
  .modal-content {
    width: 98%;
    max-height: 98vh;
  }

  .help-tab {
    font-size: 0.8rem;
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .help-content {
    padding: var(--spacing-sm);
  }
}