.nav-item {
  border-left: 3px solid transparent;
}

.nav-item.active {
  border-left-color: #3b82f6;
}

.nav-item:not(.active) {
  border-left-color: #d1d5db;
}

/* انیمیشن محو شدن و کوچک شدن */
@keyframes fadeOutScale {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(0.95);
  }
}

@keyframes fadeInScale {
  0% {
    opacity: 0;
    transform: scale(0.95);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-out {
  animation: fadeOutScale 0.3s ease-in-out forwards;
}

.animate-in {
  animation: fadeInScale 0.3s ease-in-out forwards;
}
/*  */
nav ul li button {
  color: #333;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
  transition: color 0.3s ease, border-bottom 0.3s ease;
}

nav ul li button.active-category {
  color: #1f4689;
  border-bottom: 2px solid #1f4689;
}

/*  */