:root {
  --fb-gap: 14px;
  --fb-right: 20px;
  --fb-bottom: 24px;
  --fb-green: #25D366;
}

.fb-stack {
  position: fixed;
  right: var(--fb-right);
  bottom: var(--fb-bottom);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--fb-gap);
}

.fb-label {
  background: #ffffff;
  color: #333333;
  font-size: 13px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 20px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  white-space: nowrap;
  font-family: inherit;
}

.fb-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  cursor: pointer;
  border: none;
  transition: transform 0.2s ease, opacity 0.2s ease, visibility 0.2s ease;
  text-decoration: none;
}

.fb-btn:hover {
  transform: scale(1.08);
}

.fb-whatsapp {
  background: var(--fb-green);
}

.fb-whatsapp svg {
  width: 28px;
  height: 28px;
  fill: #ffffff;
}

.fb-call {
  background: #128c7e;
}

.fb-call svg {
  width: 26px;
  height: 26px;
  fill: #ffffff;
}

.fb-back-to-top {
  background: #ffffff;
  color: #333333;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(10px);
}

.fb-back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
}

.fb-back-to-top svg {
  width: 22px;
  height: 22px;
  fill: #333333;
}

@media (max-width: 480px) {
  :root {
    --fb-right: 14px;
    --fb-bottom: 16px;
    --fb-gap: 10px;
  }

  .fb-btn {
    width: 46px;
    height: 46px;
  }

  .fb-label {
    font-size: 12px;
    padding: 5px 10px;
  }
}