/* ─── Stack Groups ─── */
.stack__groups {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.stack__group {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.stack__group-title {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

.stack__items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ─── Single Stack Item ─── */
.stack__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  cursor: default;
}

.stack__item span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-align: center;
  white-space: nowrap;
}

.stack__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stack__item:hover .stack__icon {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-md);
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .stack__groups {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .stack__icon {
    width: 46px;
    height: 46px;
  }
}