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

:root {
  --bg: #f3f3f3;
  --bg-panel: #ffffff;
  --text: #000000;
  --border: #cccccc;
  --canvas-bg: #fafafa;
}

body.dark {
  --bg: #1e1e1e;
  --bg-panel: #2c2c2c;
  --text: #e0e0e0;
  --border: #444444;
  --canvas-bg: #111111;
}

/* Layout general */
.layout {
  display: grid;
  grid-template-columns: 230px 1fr 260px;
  grid-template-rows: 50px 1fr;
  grid-template-areas:
    "topbar topbar topbar"
    "sidebar main right";
  height: 100vh;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
}

/* Topbar */
.topbar {
  grid-area: topbar;
  background: #2c3e50;
  color: white;
  display: flex;
  align-items: center;
  padding: 0 15px;
  gap: 15px;
}

#toggleSidebar,
#toggleTheme {
  background: transparent;
  border: none;
  color: white;
  font-size: 18px;
  cursor: pointer;
}

/* Sidebar */
.sidebar {
  grid-area: sidebar;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 10px;
  transition: transform 0.3s ease;
}

.sidebar h3 {
  margin: 8px 0;
}

.sidebar.hidden {
  transform: translateX(-100%);
}

.tool {
  padding: 6px 8px;
  background: #fff;
  border: 1px solid var(--border);
  margin-bottom: 6px;
  cursor: grab;
  text-align: left;
  border-radius: 4px;
  font-size: 13px;
}

.tool:active {
  cursor: grabbing;
}

/* Panel configuración de grid */
.grid-config {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  padding: 8px;
  margin-top: 8px;
  margin-bottom: 12px;
  border-radius: 6px;
}

.grid-config label {
  display: block;
  font-size: 12px;
  margin-bottom: 6px;
}

.grid-config input[type="number"],
.grid-config input[type="color"] {
  width: 100%;
  margin-top: 3px;
}

.grid-config button {
  width: 100%;
  margin-top: 6px;
  padding: 6px;
  font-size: 12px;
}

/* Main / Canvas */
.main-area {
  grid-area: main;
  background: #e5e5e5;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.canvas-wrapper {
  width: 100%;
  height: 100%;
  position: relative;
}

#canvas {
  width: 100%;
  height: 100%;
  background: var(--canvas-bg);
  border: 1px solid var(--border);
  transform-origin: 0 0;
}

/* Overlays */
#selectionOverlay,
#guidesOverlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.selection-rect {
  position: absolute;
  border: 1px dashed #3498db;
  background: rgba(52, 152, 219, 0.15);
}

.guide-line {
  position: absolute;
  background: rgba(231, 76, 60, 0.7);
}

/* Panel derecho */
.right-panel {
  grid-area: right;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  padding: 10px;
  transition: transform 0.3s ease;
}

.right-panel.hidden {
  transform: translateX(100%);
}

.panel-section {
  margin-bottom: 12px;
}

.panel-section h3 {
  margin: 4px 0;
}

.panel-section label {
  display: block;
  font-size: 12px;
  margin: 4px 0;
}

/* Lista de capas */
#layerList {
  list-style: none;
  padding: 0;
  margin: 0;
}

#layerList li {
  padding: 4px 6px;
  margin-bottom: 2px;
  background: #fff;
  border: 1px solid var(--border);
  font-size: 12px;
  cursor: pointer;
}

#layerList li.selected {
  background: #3498db;
  color: #fff;
}

/* Mini-mapa */
#minimapContainer {
  width: 100%;
  height: 150px;
  border: 1px solid var(--border);
  background: #111;
  overflow: hidden;
}

#minimap {
  width: 100%;
  height: 100%;
}

/* Handles */
.handle {
  fill: #fff;
  stroke: #3498db;
  stroke-width: 1;
  pointer-events: all;
  cursor: nwse-resize;
}

.handle-rotate {
  cursor: grab;
}

/* Botones generales */
button {
  width: 100%;
  margin-bottom: 6px;
  padding: 6px;
  font-size: 12px;
  cursor: pointer;
}

/* Responsive: tablets */
@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 200px 1fr;
    grid-template-rows: 50px 1fr 200px;
    grid-template-areas:
      "topbar topbar"
      "sidebar main"
      "right right";
  }

  .right-panel {
    border-left: none;
    border-top: 1px solid var(--border);
  }
}

/* Responsive: móviles */
@media (max-width: 768px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: 50px 1fr;
    grid-template-areas:
      "topbar"
      "main";
  }

  .sidebar {
    position: absolute;
    left: 0;
    top: 50px;
    width: 230px;
    height: calc(100% - 50px);
    z-index: 10;
    transform: translateX(-100%);
  }

  .right-panel {
    position: absolute;
    right: 0;
    top: 50px;
    width: 260px;
    height: calc(100% - 50px);
    z-index: 10;
    transform: translateX(100%);
  }
}