.nav-container {
  position: fixed;
  bottom: 24px;
  left: 0;
  right: 0;
  z-index: 90;
  display: flex;
  justify-content: center;
  transition: transform 0.4s ease, opacity 0.4s ease;
}
.nav-container.hidden {
  transform: translateY(80px);
  opacity: 0;
  pointer-events: none;
}

.navbar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  border-radius: 24px;
  background-color: var(--item-bg);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  opacity: 0.9;
  transition: background-color 0.4s ease, border-color 0.4s ease;
}

.nav-btn {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  border: none;
  background: transparent;
  color: var(--fg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.nav-btn:hover {
  transform: scale(1.1);
}
.nav-btn:active {
  transform: scale(0.9);
}
.nav-btn.active {
  background: var(--accent);
  color: #FFFFFF;
}

.nav-divider {
  width: 2px;
  height: 24px;
  background: var(--ink);
  margin: 0 4px;
  opacity: 0.3;
}