:root {
  --bg: #f7f7f3;
  --ink: #18304f;
  --muted: #5f7390;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100svh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 50% 18%, #ffffff 0, transparent 42%),
    var(--bg);
  font-family: Inter, system-ui, sans-serif;
  color: var(--ink);
  padding: clamp(12px, 3vw, 24px);
}
.wrap {
  width: min(920px, 100%);
  display: grid;
  justify-items: center;
  gap: 12px;
}
#stage {
  width: min(calc(100vw - 48px), calc(100svh - 48px), 420px);
  aspect-ratio: 1;
  cursor: grab;
  touch-action: none;
  border-radius: 50%;
  opacity: 0;
  transition: opacity 180ms ease;
}
#stage.is-loaded {
  opacity: 1;
}
#stage canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}
#stage:active { cursor: grabbing; }