.brainsync-home-categories {
  max-width: 1260px;
  margin: 1.5rem auto;
  padding: 0 15px;
}

.brainsync-home-categories__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.brainsync-home-categories__item {
  display: flex;
  flex-direction: column;
  border-radius: 8px;
  overflow: hidden;
  background-color: #fff;
  border: 1px solid #e0e0e0;
  text-decoration: none;
  transition: box-shadow 0.3s, border-color 0.3s, transform 0.3s, filter 0.4s;
  filter: grayscale(100%);
}

.brainsync-home-categories__item:hover {
  border-color: #2fb5d2;
  box-shadow: 0 4px 16px rgba(47, 181, 210, 0.2);
  text-decoration: none;
  transform: translateY(-2px);
  filter: grayscale(0%);
}

.brainsync-home-categories__item--no-img {
  background-color: #e8ecf0;
}

.brainsync-home-categories__img {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100px;
  padding: 10px;
}

.brainsync-home-categories__img img {
  max-width: 90%;
  max-height: 120px;
  object-fit: contain;
}

.brainsync-home-categories__name {
  display: block;
  width: 100%;
  padding: 8px 10px;
  background: #f5f7fa;
  color: #232323;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  line-height: 1.3;
  border-top: 1px solid #eee;
}

.brainsync-home-categories__item:hover .brainsync-home-categories__name {
  background: #eaf6fa;
  color: #1a8caa;
}

@media (max-width: 991px) {
  .brainsync-home-categories__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Mobile: color on scroll-to-center (via IntersectionObserver) */
@media (max-width: 991px) {
  .brainsync-home-categories__item.brainsync-in-view {
    filter: grayscale(0%);
    border-color: #2fb5d2;
    box-shadow: 0 4px 16px rgba(47, 181, 210, 0.2);
  }
  .brainsync-home-categories__item.brainsync-in-view .brainsync-home-categories__name {
    background: #eaf6fa;
    color: #1a8caa;
  }
}

@media (max-width: 575px) {
  .brainsync-home-categories__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  .brainsync-home-categories__img {
    min-height: 70px;
  }
  .brainsync-home-categories__img img {
    max-height: 80px;
  }
  .brainsync-home-categories__name {
    font-size: 0.78rem;
    padding: 6px 8px;
  }
}