html,
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 100%;
  width: 100%;
}


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

/* ===== Level/Layer Panel ===== */
#level-panel {
  position: fixed;
  top: 12px;
  right: 12px;
  background: rgba(17, 17, 22, 0.9);
  color: #e5e7eb;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  font-size: 12px;
  line-height: 1.4;
  padding: 10px 12px;
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
  z-index: 10;
  min-width: 220px;
}

#level-panel .lp-title {
  font-weight: 600;
  margin-bottom: 6px;
  opacity: .9;
}

#level-panel .lp-row {
  margin: 6px 0;
}

#level-panel .lp-row.small button {
  font-size: 11px;
  padding: 6px 8px;
  border: 1px solid #3a3f52;
  background: #1f2433;
  color: #e5e7eb;
  border-radius: 8px;
  cursor: pointer;
}

#level-panel input[type="range"] {
  width: 140px;
  vertical-align: middle;
}

#level-panel .lp-layers .lp-layer {
  margin: 4px 0;
  padding: 3px 4px;
  border-radius: 6px;
}

#level-panel .lp-layers .lp-layer:hover {
  background: rgba(255, 255, 255, 0.06);
}

#level-panel .lp-layers .lp-layer.active {
  outline: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.08);
}

#level-panel #lp-status {
  opacity: .9;
}

#level-panel #lp-active-name {
  font-weight: 600;
}

/* Layer box grid */
#level-panel .lp-layer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

#level-panel .lp-box {
  position: relative;
  padding: 8px 36px 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  background: rgba(255, 255, 255, 0.05);
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow .15s;
}

#level-panel .lp-box:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.35);
}

#level-panel .lp-box.active {
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.45) inset;
  border-color: rgba(255, 255, 255, 0.6);
}

#level-panel .lp-box.hidden {
  opacity: .5;
}

#level-panel .lp-box .lp-name {
  font-weight: 600;
}

#level-panel .lp-box .lp-vis {
  position: absolute;
  right: 6px;
  top: 6px;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  font-size: 16px;
  line-height: 24px;
  text-align: center;
  cursor: pointer;
}

#level-panel .lp-box .lp-vis:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
}


#level-panel .warn {
  background: rgba(255, 193, 7, 0.12);
  border: 1px solid rgba(255, 193, 7, 0.5);
  border-radius: 6px;
  padding: 6px 8px;
  margin-bottom: 6px;
  font-size: 12px;
}

#level-panel .lp-pill {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
  border: 1px solid rgba(255, 255, 255, .6);
}