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

body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
}

/* Drop zone container */
#drop-zone {
  width: 100vw;
  height: 100vh;
  display: flex;
  position: relative;
}

/* Button container (top-left) */
.button-container {
  position: absolute;
  top: 10px;
  left: 10px;
  display: flex;
  gap: 0.5rem;
  z-index: 100;
}

/* Canvas area (left side) */
.canvas-area {
  flex: 1;
  background-color: #000;
  position: relative;
  overflow: hidden;
}

.canvas-area canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

/* Drawer area (right side) */
.drawer-area {
  width: 300px;
  background-color: #f8f9fa;
  border-left: 1px solid #dee2e6;
  display: flex;
  flex-direction: column;
  overflow: visible;
  position: relative;
  transition: none;
}

/* Drawer collapsed state */
.drawer-area.collapsed {
  width: 0 !important;
  border-left: none;
  min-width: 0;
}

/* Drawer resizing state */
.drawer-area.resizing {
  user-select: none;
  pointer-events: none;
  transition: none;
}

/* Resize handle */
.resize-handle {
  position: absolute;
  left: -3px;
  top: 0;
  bottom: 0;
  width: 6px;
  cursor: ew-resize;
  background: transparent;
  z-index: 998;
  transition: background-color 0.2s;
  pointer-events: auto;
}

.resize-handle:hover {
  background-color: #0d6efd;
}

.resize-handle:active {
  background-color: #0d6efd;
}

/* Drawer toggle button (inside drawer, positioned at left edge) */
.drawer-toggle-btn {
  position: absolute;
  top: 50%;
  left: -30px;
  transform: translateY(-50%);
  width: 30px;
  height: 100px;
  border: 4px solid #6c757d;
  border-right: none;
  border-radius: 4px 0 0 4px;
  background-color: transparent;
  color: #6c757d;
  cursor: pointer;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition:
    border-color 0.2s,
    color 0.2s;
  pointer-events: auto;
}

.drawer-toggle-btn:hover {
  border-color: #495057;
  color: #495057;
}

.drawer-toggle-btn:active {
  border-color: #343a40;
  color: #343a40;
}

.drawer-toggle-btn svg {
  transform: scaleX(-1);
  transition: transform 0.3s ease;
}

/* When drawer is collapsed, flip icon back */
.drawer-area.collapsed .drawer-toggle-btn svg {
  transform: scaleX(1);
}

/* File selection area */
.file-selection {
  padding: 1rem;
  border-bottom: 1px solid #dee2e6;
}

.file-selection .btn {
  width: 100%;
}

/* Layer controls */
.layer-controls {
  display: flex;
  gap: 0.25rem;
  padding: 0.5rem;
  border-bottom: 1px solid #dee2e6;
}

.layer-controls .btn {
  flex: 1;
}

/* Alpha control */
.alpha-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem;
  border-bottom: 1px solid #dee2e6;
}

.alpha-control label {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
}

.alpha-control input[type="range"] {
  flex: 1;
}

.alpha-control span {
  min-width: 3rem;
  text-align: right;
  font-size: 0.875rem;
}

/* Layer list area */
.layer-list-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0.5rem;
}

.layer-list {
  list-style: none;
  padding: 5px;
}

/* Layer item */
.layer-item {
  display: flex;
  align-items: center;
  padding: 0.5rem;
  margin-bottom: 0.25rem;
  background-color: #fff;
  border-radius: 4px;
  border: 1px solid #dee2e6;
  transition: background-color 0.2s;
}

.layer-item:hover {
  background-color: #f1f3f5;
}

/* Color picker */
.layer-color-picker {
  width: 15px;
  height: 15px;
  border-radius: 2px;
  border: 1px solid #adb5bd;
  cursor: pointer;
  flex-shrink: 0;
  margin-right: 0.5rem;
}

/* Checkbox */
.layer-checkbox {
  flex-shrink: 0;
  margin-right: 0.5rem;
  cursor: pointer;
}

/* Layer label */
.layer-label {
  flex: 1;
  font-size: 0.875rem;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Layer delete button */
.layer-delete-btn {
  margin-left: auto;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: #dc3545;
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: bold;
  line-height: 1;
  padding: 0;
  flex-shrink: 0;
  transition: background-color 0.2s;
}

.layer-delete-btn:hover {
  background-color: #c82333;
}

.layer-delete-btn:active {
  background-color: #bd2130;
}

/* Scrollbar styling */
.layer-list-container::-webkit-scrollbar {
  width: 8px;
}

.layer-list-container::-webkit-scrollbar-track {
  background: #f1f3f5;
  border-radius: 4px;
}

.layer-list-container::-webkit-scrollbar-thumb {
  background: #adb5bd;
  border-radius: 4px;
}

.layer-list-container::-webkit-scrollbar-thumb:hover {
  background: #868e96;
}