/* Floating call button, bottom right. Quiet at rest; on hover or keyboard
   focus two soft rings spread out from it. */
.call-fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 20;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--c-accent);
  color: #FFFFFF;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
  transition: transform .2s ease, background-color .2s ease;
}
.call-fab:hover,
.call-fab:focus-visible { color: #FFFFFF; background: #2B88FF; transform: scale(1.06); }
.call-fab:focus-visible { outline: 2px solid #FFFFFF; outline-offset: 3px; }

.call-fab::before,
.call-fab::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid var(--c-accent);
  opacity: 0;
  pointer-events: none;
}
.call-fab:hover::before,
.call-fab:focus-visible::before { animation: call-ripple 1.6s ease-out infinite; }
.call-fab:hover::after,
.call-fab:focus-visible::after { animation: call-ripple 1.6s ease-out .8s infinite; }

@keyframes call-ripple {
  from { transform: scale(1); opacity: 0.6; }
  to { transform: scale(1.9); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .call-fab:hover::before, .call-fab:hover::after,
  .call-fab:focus-visible::before, .call-fab:focus-visible::after { animation: none; }
}

@media (max-width: 900px) {
  .call-fab { right: 16px; bottom: 16px; width: 48px; height: 48px; }
}