/* ===== ADD OBJECT BUTTON (FAB) ===== */
#addObjectButton {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #00b4db;
  color: #000;
  font-size: 36px;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  z-index: 10000;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  border: none;
}

#addObjectButton:hover {
  background: #00e0ff;
  transform: scale(1.08);
  box-shadow: 0 10px 32px rgba(0, 180, 219, 0.35);
}

#addObjectButton:active {
  transform: scale(0.96);
}