.euler-stage {
  position: relative;
  width: min(92vw, 360px);
  height: min(92vw, 360px);
  margin: 10px auto;
  background: var(--surface-2);
  border-radius: 14px;
}
.euler-stage svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.euler-node {
  position: absolute;
  width: 30px;
  height: 30px;
  margin: -15px 0 0 -15px;
  border-radius: 50%;
  border: 3px solid var(--grape);
  background: #fff;
  color: var(--ink);
  font-weight: 700;
  display: grid;
  place-items: center;
  cursor: pointer;
}
.euler-node.start {
  border-color: #ff5c5c;
  background: #ff5c5c;
  color: #fff;
}
.euler-node.cur {
  box-shadow: 0 0 0 4px rgba(255, 217, 61, 0.7);
}
.euler-node.done {
  background: var(--grape);
  color: #fff;
}
.hud b { color: var(--ink); }