.playground {
  flex: 1;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle, rgba(128,128,128,0.18) 1px, transparent 1px);
  background-size: 24px 24px;
  cursor: none;
}

.hint {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--text-muted);
  font-size: 14px;
  pointer-events: none;
  user-select: none;
}

.remote-cursor {
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(-2px, -2px);
  transition: left 0.08s linear, top 0.08s linear;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  z-index: 3;
}

.remote-cursor svg {
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.25));
}

.remote-cursor .cursor-label {
  margin-top: 2px;
  margin-left: 14px;
  padding: 2px 8px;
  border-radius: 8px;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

.burst {
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 2;
  font-size: 22px;
  animation: burst-pop 0.7s ease forwards;
}

@keyframes burst-pop {
  0% { transform: translate(-50%, -50%) scale(0.3); opacity: 1; }
  70% { transform: translate(-50%, -50%) scale(1.3); opacity: 1; }
  100% { transform: translate(-50%, -70%) scale(1.5); opacity: 0; }
}