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

body {
  font-family: Arial, sans-serif;
  background: #1a1a2e;
  color: #e0e0e0;
  overflow: hidden;
  height: 100vh;
}

#app {
  display: flex;
  height: 100vh;
}

/* --- Toolbar / Palette --- */
#toolbar {
  width: 220px;
  min-width: 220px;
  background: #16213e;
  border-right: 2px solid #0f3460;
  padding: 10px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

#toolbar h2 {
  font-size: 14px;
  color: #e94560;
  margin: 10px 0 6px 0;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.setting {
  margin-bottom: 8px;
}

.setting label {
  display: block;
  font-size: 12px;
  margin-bottom: 3px;
  color: #aaa;
}

.setting input[type="number"] {
  width: 100%;
  padding: 4px 6px;
  background: #0f3460;
  border: 1px solid #1a1a5e;
  color: #e0e0e0;
  border-radius: 3px;
  font-size: 13px;
}

.setting input[type="checkbox"] {
  margin-right: 5px;
}

.setting button {
  width: 100%;
  padding: 6px;
  margin-bottom: 4px;
  background: #0f3460;
  border: 1px solid #1a1a5e;
  color: #e0e0e0;
  border-radius: 3px;
  cursor: pointer;
  font-size: 12px;
}

.setting button:hover {
  background: #e94560;
}

/* --- Palette symbols --- */
#palette {
  flex: 1;
  overflow-y: auto;
}

.palette-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 4px;
  margin-bottom: 4px;
  background: #0f3460;
  border: 1px solid #1a1a5e;
  border-radius: 4px;
  cursor: grab;
  user-select: none;
  transition: background 0.15s;
}

.palette-item:hover {
  background: #1a1a5e;
  border-color: #e94560;
}

.palette-item:active {
  cursor: grabbing;
}

.palette-item img {
  width: 40px;
  height: 30px;
  object-fit: contain;
  background: #222;
  border-radius: 3px;
  padding: 2px;
}

.palette-item span {
  font-size: 11px;
  color: #ccc;
}

/* --- Canvas area --- */
#canvas-wrapper {
  flex: 1;
  overflow: hidden;
  background: #111;
  position: relative;
}

#canvas {
  width: 1920px;
  height: 1080px;
  position: absolute;
  background: #1e1e1e;
  border: 1px solid #333;
  transform-origin: 0 0;
}

#pdf-background {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  width: 1920px;
  height: 1080px;
  pointer-events: none;
  z-index: 0;
}

#pdf-background canvas {
  position: absolute;
  transform-origin: 0 0;
  opacity: 0.35;
}

#pdf-background.editing canvas {
  opacity: 0.6;
  cursor: move;
}

/* Edit background active indicator */
.edit-bg-active {
  background: #e94560 !important;
  color: #fff !important;
}

#grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 1920px;
  height: 1080px;
  pointer-events: none;
  z-index: 1;
}

#drop-zone {
  position: absolute;
  top: 0;
  left: 0;
  width: 1920px;
  height: 1080px;
  z-index: 2;
}

/* --- Placed symbols on canvas --- */
.placed-symbol {
  position: absolute;
  cursor: move;
  user-select: none;
  border: 1px solid transparent;
  transition: border-color 0.1s;
  resize: none;
}

.placed-symbol:hover {
  border-color: #e94560;
}

.placed-symbol.selected {
  border-color: #00ff88;
  box-shadow: 0 0 6px rgba(0, 255, 136, 0.4);
}

.placed-symbol.dragging {
  opacity: 0.7;
  z-index: 1000;
}

.placed-symbol.collision {
  border-color: #ff0000;
  box-shadow: 0 0 8px rgba(255, 0, 0, 0.6);
}

.placed-symbol img {
  width: 100%;
  height: 100%;
  pointer-events: none;
  display: block;
}

/* --- Drag ghost --- */
.drag-ghost {
  position: fixed;
  pointer-events: none;
  opacity: 0.6;
  z-index: 9999;
}

/* --- Context menu --- */
.context-menu {
  position: fixed;
  background: #16213e;
  border: 1px solid #0f3460;
  border-radius: 4px;
  padding: 4px 0;
  z-index: 10000;
  min-width: 140px;
}

.context-menu-item {
  padding: 6px 14px;
  font-size: 12px;
  color: #e0e0e0;
  cursor: pointer;
}

.context-menu-item:hover {
  background: #e94560;
}

/* --- Resize handle (conveyor width) --- */
.resize-handle {
  position: absolute;
  top: 50%;
  right: -5px;
  width: 10px;
  height: 10px;
  transform: translateY(-50%);
  background: #00ff88;
  border: 1px solid #009955;
  border-radius: 2px;
  cursor: ew-resize;
  z-index: 10;
}