:root {
  --bg: #0b0b0f;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  overflow: hidden;
  overscroll-behavior: none;
}
#c {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
}
#c.dragging { cursor: grabbing; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
#dbg {
  position: fixed;
  left: 8px;
  bottom: 8px;
  font: 11px/1.3 ui-monospace, Menlo, monospace;
  color: #8a8a99;
  pointer-events: none;
}