.stair-grid-panel {
  position: fixed;
  z-index: 20;
  width: 340px;
  max-width: calc(100vw - 24px);
  max-height: calc(100vh - 24px);
  overflow: auto;
  padding: 15px;
  border: 1px solid #50667d;
  border-radius: 10px;
  background: #12202e;
  box-shadow: 0 8px 28px #0008;
  color: #dce9f6;
  font-size: 12px;
}
.stair-grid-panel header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.stair-grid-panel fieldset {
  border: 1px solid #354b60;
  border-radius: 6px;
  padding: 10px;
  margin: 10px 0;
}
.stair-grid-panel legend { color: #b4d0ec; padding: 0 6px; }
.stair-grid-toggle { display: flex; align-items: center; gap: 8px; margin-bottom: 13px; }
.stair-grid-range { display: grid; gap: 4px; margin-top: 10px; }
.stair-grid-range > span { display: flex; justify-content: space-between; gap: 10px; }
.stair-grid-range output { color: #a9caf5; font-variant-numeric: tabular-nums; }
.stair-grid-range input { width: 100%; padding: 0; margin: 0; height: 17px; }
.stair-grid-panel p { color: #9fb2c7; font-size: 11px; margin: 12px 0 0; }
.stair-grid-panel input[type=range] { accent-color: #97bfff; }
.stair-grid-panel fieldset:last-of-type input[type=range] { accent-color: #ebbb79; }