/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  touch-action: none;
}

:root {
  --bg-primary: #1e1e2e;
  --bg-secondary: #2a2a3e;
  --bg-tertiary: #343450;
  --bg-hover: #3e3e58;
  --text-primary: #e0e0f0;
  --text-secondary: #a0a0c0;
  --accent: #6c8bef;
  --accent-hover: #8aa0ff;
  --border: #404060;
  --canvas-bg: #ffffff;
  --panel-width: 220px;
  --toolbar-height: 44px;
  --statusbar-height: 24px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 12px;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
  user-select: none;
}

/* === Toolbar === */
#toolbar {
  height: var(--toolbar-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 8px;
  gap: 4px;
  flex-shrink: 0;
  overflow-x: auto;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 2px;
}

.toolbar-group label {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text-secondary);
  font-size: 11px;
  white-space: nowrap;
}

.toolbar-separator {
  width: 1px;
  height: 28px;
  background: var(--border);
  margin: 0 6px;
  flex-shrink: 0;
}

.tool-btn {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 4px 8px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 11px;
  white-space: nowrap;
  transition: background 0.1s, border-color 0.1s;
}

.tool-btn:hover {
  background: var(--bg-hover);
  border-color: var(--border);
}

.tool-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.tool-icon {
  font-size: 15px;
  line-height: 1;
  width: 18px;
  text-align: center;
}

.tool-label {
  font-size: 11px;
}

.action-btn {
  padding: 4px 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 11px;
  white-space: nowrap;
  transition: background 0.1s;
}

.action-btn:hover {
  background: var(--bg-hover);
}

.action-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#toolbar select,
#toolbar input[type="number"] {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-primary);
  padding: 2px 4px;
  font-size: 11px;
}

#zoom-display {
  font-size: 11px;
  color: var(--text-secondary);
  min-width: 40px;
  text-align: center;
}

#snap-indicator {
  font-size: 8px;
  color: #4ade80;
}

#snap-indicator.off {
  color: #666;
}

/* === Main Content === */
#main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* === Panels === */
.panel {
  width: var(--panel-width);
  background: var(--bg-secondary);
  border-color: var(--border);
  overflow-y: auto;
  flex-shrink: 0;
}

#left-panel {
  border-right: 1px solid var(--border);
}

#right-panel {
  border-left: 1px solid var(--border);
}

.panel-section {
  padding: 8px;
  border-bottom: 1px solid var(--border);
}

.panel-header {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* === Color Controls === */
.color-pair {
  display: flex;
  gap: 12px;
  margin-bottom: 6px;
}

.color-swatch-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.color-swatch-wrap label {
  font-size: 10px;
  color: var(--text-secondary);
}

.color-swatch {
  width: 36px;
  height: 36px;
  border-radius: 4px;
  border: 2px solid var(--border);
  cursor: pointer;
  position: relative;
  transition: border-color 0.15s;
}

.color-swatch:hover {
  border-color: var(--accent);
}

.no-fill {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #f55;
  font-size: 18px;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 3px,
    rgba(255,255,255,0.1) 3px,
    rgba(255,255,255,0.1) 6px
  );
}

.hidden-color-input {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}

.fill-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-secondary);
  cursor: pointer;
}

.fill-toggle input {
  accent-color: var(--accent);
}

/* === Palette === */
.palette-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
}

.palette-color {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 3px;
  border: 1px solid rgba(255,255,255,0.1);
  cursor: pointer;
  transition: transform 0.1s, border-color 0.1s;
}

.palette-color:hover {
  transform: scale(1.2);
  border-color: #fff;
  z-index: 1;
}

.palette-target {
  display: flex;
  gap: 10px;
  margin-top: 6px;
  font-size: 11px;
  color: var(--text-secondary);
}

.palette-target label {
  display: flex;
  align-items: center;
  gap: 3px;
  cursor: pointer;
}

.palette-target input {
  accent-color: var(--accent);
}

/* === Stroke Controls === */
.stroke-controls label,
.text-controls label,
.canvas-settings label {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
  font-size: 11px;
  color: var(--text-secondary);
}

.stroke-controls input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
}

.stroke-controls select,
.text-controls select,
.text-controls input[type="number"] {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-primary);
  padding: 2px 4px;
  font-size: 11px;
}

.canvas-settings input[type="color"] {
  width: 32px;
  height: 24px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-tertiary);
  cursor: pointer;
  padding: 1px;
}

.text-controls label {
  white-space: nowrap;
}

/* === Canvas === */
#canvas-container {
  flex: 1;
  overflow: hidden;
  position: relative;
  background: #2a2a3e;
  cursor: crosshair;
}

#canvas {
  width: 100%;
  height: 100%;
  display: block;
}

#canvas-container.panning {
  cursor: grab;
}

#canvas-container.panning:active {
  cursor: grabbing;
}

/* === Layers === */
#layers-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.layer-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  cursor: pointer;
  transition: background 0.1s;
  font-size: 11px;
}

.layer-item:hover {
  background: var(--bg-hover);
}

.layer-item.active {
  background: var(--accent);
  color: #fff;
}

.layer-item .layer-visibility {
  cursor: pointer;
  font-size: 13px;
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}

.layer-item .layer-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.layer-item .layer-name input {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--accent);
  border-radius: 2px;
  color: var(--text-primary);
  font-size: 11px;
  padding: 1px 4px;
}

.layer-item .layer-opacity-ctrl {
  width: 36px;
  font-size: 10px;
  text-align: right;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.layer-actions {
  display: flex;
  gap: 2px;
}

/* === Arrange Buttons === */
.arrange-buttons {
  display: flex;
  gap: 4px;
}

.small-btn {
  padding: 3px 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 11px;
  line-height: 1;
  transition: background 0.1s;
}

.small-btn:hover {
  background: var(--bg-hover);
}

/* === Status Bar === */
#status-bar {
  height: var(--statusbar-height);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 20px;
  font-size: 11px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

/* === Modals === */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  min-width: 360px;
  max-width: 500px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.modal-header {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.modal-content p {
  margin-bottom: 8px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.modal-content h4 {
  margin: 12px 0 8px;
  color: var(--text-primary);
  font-size: 13px;
}

.modal-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 16px;
}

.modal-btn {
  padding: 6px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 12px;
  transition: background 0.1s;
}

.modal-btn:hover {
  background: var(--bg-hover);
}

.modal-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.modal-btn.primary:hover {
  background: var(--accent-hover);
}

#text-input {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  padding: 8px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
}

#text-input:focus {
  outline: none;
  border-color: var(--accent);
}

.shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 11px;
}

.shortcuts-table td {
  padding: 3px 8px;
  border-bottom: 1px solid var(--border);
}

.shortcuts-table td:first-child {
  font-weight: 600;
  color: var(--accent);
  width: 120px;
  font-family: monospace;
}

/* === Selection Handles === */
.selection-box {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1;
  stroke-dasharray: 4,4;
  pointer-events: none;
}

.selection-handle {
  fill: #fff;
  stroke: var(--accent);
  stroke-width: 1.5;
  cursor: pointer;
}

.marquee-rect {
  fill: rgba(108, 139, 239, 0.1);
  stroke: var(--accent);
  stroke-width: 1;
  stroke-dasharray: 4,4;
  pointer-events: none;
}

/* === Element hover/selected highlight === */
.element-highlight {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1;
  stroke-dasharray: 3,3;
  pointer-events: none;
  opacity: 0.5;
}

/* === Drawing preview === */
.drawing-preview {
  pointer-events: none;
  opacity: 0.6;
}

/* === Light Theme Override === */
body:not(.dark) {
  --bg-primary: #f5f5f5;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e8e8e8;
  --bg-hover: #ddd;
  --text-primary: #333;
  --text-secondary: #666;
  --accent: #4a70d6;
  --accent-hover: #3a5cb8;
  --border: #ccc;
}

/* === Scrollbar === */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* === Responsive === */
@media (max-width: 1000px) {
  .tool-label { display: none; }
  :root { --panel-width: 180px; }
}

@media (max-width: 800px) {
  :root { --panel-width: 160px; }
}