:root {
  --bg: #1a1a1a;
  --fg: #e0e0e0;
  --accent: #86c06c;
  --panel: #2a2a2a;
  --border: #444;

  /* Collision class swatches. Walkable is the default and isn't painted on
     the canvas, so its swatch is a neutral gray to read as "no overlay". */
  --collision-walkable:   rgba(200, 200, 200, 0.25);
  --collision-unwalkable: rgba(255,  30,  30, 0.70);
  --collision-ladder:     rgba( 60, 140, 255, 0.65);
  --collision-cloud:      rgba(255, 215,  60, 0.55);
  --portal-fill:          rgba(220,  60, 220, 0.80);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  background: var(--bg);
  color: var(--fg);
  font-size: 14px;
}

header {
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

header h1 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
}

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

.controls select {
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 4px 8px;
  font-family: inherit;
  font-size: 13px;
}

.layer-toggles {
  border: 1px solid var(--border);
  padding: 2px 8px;
  display: flex;
  gap: 8px;
}

.layer-toggles legend {
  font-size: 11px;
  color: #999;
  padding: 0 4px;
}

.layer-toggles label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
}

.legend {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: #aaa;
}

.swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 1px solid var(--border);
  vertical-align: middle;
  margin-right: 2px;
}

.swatch.walkable   { background: var(--collision-walkable); }
.swatch.unwalkable { background: var(--collision-unwalkable); }
.swatch.ladder     { background: var(--collision-ladder); }
.swatch.cloud      { background: var(--collision-cloud); }
.swatch.portal     { background: var(--portal-fill); }

main {
  padding: 20px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

#map-canvas {
  /* The on-disk PNG is 256x256 (32×32 tiles). Scale up 2x for
     comfortable inspection without losing pixel alignment. */
  width: 512px;
  height: 512px;
  image-rendering: pixelated;
  background: #000;
  border: 1px solid var(--border);
  cursor: crosshair;
}

#tile-info {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 12px 16px;
  min-width: 240px;
  font-size: 12px;
  line-height: 1.6;
}

#tile-info dl {
  margin: 0;
}

#tile-info dt {
  color: #999;
  font-size: 11px;
  margin-top: 6px;
}

#tile-info dt:first-child {
  margin-top: 0;
}

#tile-info dd {
  margin: 0 0 0 8px;
}