.navigation-bar {
  position: absolute;
  top: 220px; /* Below ViewHelper (80 + 128 + padding) */
  right: 20px;
  width: 34px; /* Match button width */
  display: flex;
  flex-direction: column;
  background: transparent; /* Removed container background */
  padding: 0;
  z-index: 9;
}

.nav-button {
  width: 34px;
  height: 34px;
  background-color: rgba(20, 20, 20, 0.6); /* Dark background for each button */
  border: 1px solid rgba(255, 255, 255, 0.1); /* Subtle border */
  cursor: pointer;
  color: #ccc;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px; /* Increased spacing */
  user-select: none;
  touch-action: none;
  border-radius: 50%;
  box-shadow: 0 2px 5px rgba(0,0,0,0.3);
  transition: background-color 0.2s, transform 0.1s;
}

.nav-button:hover {
  background-color: rgba(40, 40, 40, 0.8);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
}

.nav-button:active {
  transform: scale(0.95);
  background-color: rgba(20, 20, 20, 0.9);
}

.nav-button:last-child {
  margin-bottom: 0;
}

.nav-button img {
  width: 20px; /* Slightly smaller icon inside */
  height: 20px;
  opacity: 0.9;
}