:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-surface: #0f3460;
  --bg-hover: #1a4a7a;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0b0;
  --accent: #e94560;
  --accent-hover: #ff6b81;
  --border: #2a2a4a;
  --highlight-row: rgba(233, 69, 96, 0.15);
  --radius: 6px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto auto 1fr;
}

/* Header */
.header {
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.header h1 {
  font-size: 24px;
  color: var(--accent);
  letter-spacing: 1px;
}

.header p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Controls */
.controls {
  padding: 12px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.controls-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.divider {
  width: 1px;
  height: 28px;
  background: var(--border);
}

.upload-btn {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}

.upload-btn:hover,
.upload-btn:focus-visible {
  background: var(--accent-hover);
  outline: none;
}

.preset-label {
  font-size: 13px;
  color: var(--text-secondary);
}

.preset-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.preset-btn {
  padding: 6px 12px;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}

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

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

.custom-size {
  display: flex;
  align-items: center;
  gap: 6px;
}

.custom-size input {
  width: 60px;
  padding: 6px 8px;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  text-align: center;
}

.custom-size input:focus {
  outline: none;
  border-color: var(--accent);
}

.custom-size span {
  color: var(--text-secondary);
  font-size: 13px;
}

.apply-btn {
  padding: 6px 14px;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}

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

.download-btn {
  padding: 8px 16px;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
}

.download-btn:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--accent);
}

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

/* Workspace */
.workspace {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 1fr auto;
  gap: 1px;
  background: var(--border);
  overflow: hidden;
}

.canvas-panel {
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow: auto;
  min-height: 300px;
}

.canvas-panel.code-view {
  align-items: flex-start;
  justify-content: flex-start;
}

.drop-zone {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s;
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(233, 69, 96, 0.05);
}

.drop-zone.has-image {
  border-color: transparent;
}

.drop-hint {
  text-align: center;
  color: var(--text-secondary);
  pointer-events: none;
}

.drop-hint p:first-child {
  font-size: 16px;
  margin-bottom: 8px;
}

.drop-hint p:last-child {
  font-size: 13px;
}

.drop-zone.has-image .drop-hint {
  display: none;
}

#displayCanvas {
  display: none;
  cursor: crosshair;
}

.drop-zone.has-image #displayCanvas {
  display: block;
}

/* Stats Panel */
.stats-panel {
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 35vh;
}

.stats-panel h2 {
  padding: 16px 20px 12px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
}

.table-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 0;
}

.empty-hint {
  text-align: center;
  color: var(--text-secondary);
  padding: 40px 20px;
  font-size: 14px;
}

#colorTable {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

#colorTable thead {
  position: sticky;
  top: 0;
  z-index: 1;
}

#colorTable th {
  background: var(--bg-secondary);
  padding: 10px 12px;
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}

#colorTable td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

#colorTable tbody tr {
  transition: background 0.15s;
  cursor: pointer;
}

#colorTable tbody tr:hover {
  background: var(--bg-hover);
}

#colorTable tbody tr.highlight {
  background: var(--highlight-row);
}

@keyframes flash {
  0%, 100% { background: var(--highlight-row); }
  50% { background: rgba(233, 69, 96, 0.3); }
}

#colorTable tbody tr.flash {
  animation: flash 0.6s ease 2;
}

.color-swatch {
  display: inline-block;
  width: 20px;
  height: 20px;
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  vertical-align: middle;
}

.percent-bar {
  display: inline-block;
  height: 4px;
  background: var(--accent);
  border-radius: 2px;
  margin-left: 6px;
  vertical-align: middle;
  max-width: 60px;
}

/* Merge Group */
.merge-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.merge-group input[type="range"] {
  width: 100px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.merge-group input[type="range"]:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.merge-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-secondary);
  cursor: pointer;
}

.merge-group input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-secondary);
  cursor: pointer;
}

.merge-value {
  font-size: 13px;
  color: var(--text-primary);
  min-width: 24px;
  text-align: center;
}

.merge-color-count {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* View Group */
.view-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Sample Method */
.sample-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Crop Editor */
.crop-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.crop-btn,
.reset-crop-btn {
  padding: 6px 14px;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}

.crop-btn:hover:not(:disabled),
.reset-crop-btn:hover:not(:disabled) {
  background: var(--bg-hover);
  border-color: var(--accent);
}

.crop-btn:disabled,
.reset-crop-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

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

#editorCanvas {
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: crosshair;
}

.drop-zone.editor-mode #editorCanvas {
  display: block;
}

.drop-zone.editor-mode #displayCanvas {
  display: none !important;
}

.drop-zone.editor-mode .drop-hint {
  display: none;
}

/* Responsive */
@media (max-width: 768px) {
  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
  }

  .controls-row {
    justify-content: center;
  }

  .divider {
    display: none;
  }

  .header {
    flex-direction: column;
    gap: 4px;
    text-align: center;
  }
}

/* Canvas Panel Scrollbar */
.canvas-panel::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

.canvas-panel::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

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

/* Scrollbar */
.table-wrapper::-webkit-scrollbar {
  width: 6px;
}

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

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

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

/* Paint Mode / Palette Picker */
.palette-picker {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 12px 16px;
}

.palette-selected-info {
  padding: 8px 12px;
  margin-bottom: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.palette-group-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 8px 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(28px, 1fr));
  gap: 3px;
  margin-bottom: 6px;
}

.palette-swatch {
  width: 28px;
  height: 28px;
  border-radius: 3px;
  border: 1px solid rgba(255,255,255,0.1);
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 600;
  color: #fff;
  text-shadow: 0 0 2px rgba(0,0,0,0.6);
  user-select: none;
  overflow: hidden;
}

.palette-swatch:hover {
  transform: scale(1.25);
  box-shadow: 0 0 0 2px var(--accent);
  z-index: 1;
  position: relative;
}

.palette-swatch.active {
  transform: scale(1.2);
  box-shadow: 0 0 0 2px var(--accent);
  z-index: 1;
  position: relative;
}

.drop-zone.paint-mode #displayCanvas {
  cursor: cell;
}

.drop-zone.eyedropper-mode #displayCanvas {
  cursor: crosshair;
}

.palette-picker::-webkit-scrollbar {
  width: 6px;
}

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

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

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