.fab-stack {
  position: fixed;
  bottom: var(--space-3);
  right: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: var(--z-fab);
}
.fab {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-fab);
  transition: transform var(--transition-base);
}
.fab:hover { transform: translateY(-2px); }
.fab--tg { background: #229ED9; }
.fab--call { background: var(--color-action-primary); }
.fab svg { width: 28px; height: 28px; fill: white; }
.fab--call svg { fill: var(--color-text-primary); }
@media (min-width: 768px) { .fab { width: 60px; height: 60px; } }