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

:root {
  --bg: #1a1a1e;
  --panel: #232328;
  --panel-border: #333338;
  --text: #e0e0e0;
  --text-dim: #888;
  --accent: #4a9eff;
  --accent-hover: #6bb3ff;
  --handle: #ff6b35;
  --handle-active: #ffaa00;
  --crop-color: #00cc88;
  --danger: #ff4466;
}

html, body { height: 100%; overflow: hidden; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: center;
  background: var(--panel);
  border-bottom: 1px solid var(--panel-border);
  flex-shrink: 0;
  height: 44px;
}

.header-sidebar {
  width: 280px;
  min-width: 280px;
  padding: 0 14px;
  border-right: 1px solid var(--panel-border);
  height: 100%;
  display: flex;
  align-items: center;
}

header h1 { font-size: 14px; font-weight: 600; letter-spacing: 0.5px; }

.header-canvas {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  gap: 8px;
}

.header-left, .header-right { display: flex; gap: 6px; align-items: center; }

.header-sep {
  width: 1px;
  height: 20px;
  background: var(--panel-border);
  margin: 0 2px;
}

header button { padding: 4px 12px; font-size: 12px; }

.main-layout { display: flex; flex: 1; overflow: hidden; }

.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--panel);
  border-right: 1px solid var(--panel-border);
  overflow-y: scroll;
  flex-shrink: 0;
}

.canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #111114;
  cursor: default;
}

.canvas-area.dragging-point { cursor: none; }
.canvas-area.eyedropper { cursor: crosshair; }

#dropZone {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--text-dim);
  z-index: 5;
}

#dropZone.hidden { display: none; }

#dropZone.drag-over {
  background: rgba(74, 158, 255, 0.08);
  border: 2px dashed var(--accent);
}

#dropZone .drop-icon { font-size: 48px; opacity: 0.4; }

#dropZone label {
  padding: 8px 20px;
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
}

#dropZone label:hover { background: var(--accent-hover); }

#mainCanvas { position: absolute; image-rendering: auto; }

.overlay-canvas { position: absolute; pointer-events: none; z-index: 2; }

#interactionLayer { position: absolute; inset: 0; z-index: 3; display: none; }

.magnifier {
  position: fixed;
  width: 140px;
  height: 140px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  box-shadow: 0 4px 20px rgba(0,0,0,0.6);
  overflow: hidden;
  pointer-events: none;
  z-index: 100;
  display: none;
  background: #000;
}

.magnifier canvas { width: 100%; height: 100%; }

.magnifier-crosshair { position: absolute; inset: 0; pointer-events: none; }

.magnifier-crosshair::before,
.magnifier-crosshair::after {
  content: '';
  position: absolute;
  background: rgba(255,255,255,0.4);
}

.magnifier-crosshair::before {
  left: 50%; top: 0; bottom: 0; width: 1px;
  transform: translateX(-0.5px);
}

.magnifier-crosshair::after {
  top: 50%; left: 0; right: 0; height: 1px;
  transform: translateY(-0.5px);
}

/* Sidebar */
.panel-section {
  border-bottom: 1px solid var(--panel-border);
  padding: 12px 14px;
}

.panel-section h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

#presetSelect {
  width: 100%;
  padding: 6px 8px;
  font-size: 12px;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  outline: none;
}

#presetSelect:focus { border-color: var(--accent); }
#presetSelect option { background: var(--panel); }

.slider-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.slider-row:last-child { margin-bottom: 0; }

.slider-row label {
  font-size: 11px;
  min-width: 70px;
  color: var(--text-dim);
}

.slider-row input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255,255,255,0.12);
  border-radius: 2px;
  outline: none;
}

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

.slider-row .val {
  font-size: 11px;
  min-width: 32px;
  text-align: right;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.input-row label {
  font-size: 11px;
  min-width: 50px;
  color: var(--text-dim);
}

.dim-row .input-row label {
  min-width: auto;
}

.input-row input[type="number"], .input-row select {
  flex: 1;
  padding: 4px 8px;
  font-size: 11px;
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  color: var(--text);
  outline: none;
}

.input-row input[type="number"]:focus, .input-row select:focus {
  border-color: var(--accent);
}

.input-row select { cursor: pointer; }
.input-row select option { background: var(--panel); }

.dim-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 8px;
}

.dim-row .input-row {
  flex: 1;
  margin-bottom: 0;
  min-width: 0;
}

.dim-row .input-row input[type="number"] {
  width: 100%;
  min-width: 0;
}

.link-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  cursor: pointer;
  color: var(--accent);
  opacity: 0.6;
  user-select: none;
}

.link-icon.active { opacity: 1; }

button {
  padding: 6px 14px;
  font-size: 12px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
}

button:hover { background: rgba(255,255,255,0.14); }

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

.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.85; }

.btn-row { display: flex; gap: 6px; margin-top: 8px; }
.btn-row button { flex: 1; }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  font-size: 12px;
  cursor: pointer;
}

.checkbox-row input { accent-color: var(--accent); }

.mode-tabs {
  display: flex;
  gap: 2px;
  background: rgba(0,0,0,0.2);
  border-radius: 5px;
  padding: 2px;
  margin-bottom: 10px;
}

.mode-tab {
  flex: 1;
  padding: 5px 8px;
  font-size: 11px;
  text-align: center;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.15s;
}

.mode-tab:hover { color: var(--text); }
.mode-tab.active { background: rgba(255,255,255,0.1); color: var(--text); }

.info-text {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.5;
  margin-top: 6px;
}

.aspect-display {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 4px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* Color swatches */
.color-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
  min-height: 24px;
}

.color-swatch {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  border: 2px solid rgba(255,255,255,0.3);
  cursor: pointer;
  position: relative;
}

.color-swatch:hover { border-color: #fff; }

.color-swatch.remove-mode::after {
  content: '×';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: bold;
  color: #fff;
  background: rgba(0,0,0,0.5);
  border-radius: 2px;
}

.color-swatch.protected { border-color: var(--crop-color); }

.swatch-placeholder {
  font-size: 10px;
  color: var(--text-dim);
  font-style: italic;
  line-height: 24px;
}

/* Color preview tooltip */
.color-preview {
  display: none;
  position: fixed;
  padding: 6px 10px;
  background: rgba(0,0,0,0.85);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  z-index: 100;
  pointer-events: none;
  font-size: 11px;
  gap: 6px;
  align-items: center;
}

.color-preview .preview-swatch {
  width: 20px;
  height: 20px;
  border-radius: 3px;
  border: 1px solid rgba(255,255,255,0.2);
}

/* Shortcuts */
.collapsible {
  cursor: pointer;
  user-select: none;
}

.collapse-arrow {
  font-size: 9px;
  transition: transform 0.15s;
  display: inline-block;
}

.collapsible.open .collapse-arrow {
  transform: rotate(90deg);
}

.shortcuts-table {
  width: 100%;
  font-size: 10px;
  color: var(--text-dim);
  border-collapse: collapse;
}

.shortcuts-table td {
  padding: 3px 0;
  vertical-align: top;
}

.shortcuts-table td:first-child {
  white-space: nowrap;
  padding-right: 10px;
  width: 1%;
}

.shortcuts-table kbd {
  display: inline-block;
  padding: 1px 5px;
  font-size: 10px;
  font-family: inherit;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--panel-border);
  border-radius: 3px;
}

.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }

/* Checkerboard for transparency preview */
.checkerboard {
  background-image:
    linear-gradient(45deg, #333 25%, transparent 25%),
    linear-gradient(-45deg, #333 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #333 75%),
    linear-gradient(-45deg, transparent 75%, #333 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}