.avfb-floating {
  position: fixed;
  left: var(--avfb-left, 20px);
  bottom: var(--avfb-bottom, 20px);
  z-index: 99999;
}

.avfb-floating-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--avfb-size, 150px);
  height: var(--avfb-size, 150px);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.86);
  border: none;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  transform: translate3d(0, 0, 0);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.avfb-floating-btn[aria-disabled="true"] {
  cursor: default;
}

.avfb-floating-btn img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: drop-shadow(0px 1px 4px rgba(0, 0, 0, 0.16));
}

.avfb-floating-btn:hover {
  transform: translate3d(0, -6px, 0) scale(1.07);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
  background: rgba(0, 0, 0, 0.96);
  animation: avfb-float-pulse 1.1s ease-in-out infinite;
}

.avfb-floating-btn:focus-visible {
  outline: 3px solid rgba(255, 255, 255, 0.45);
  outline-offset: 3px;
}

@keyframes avfb-float-pulse {
  0% {
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45), 0 0 0 0 rgba(255, 255, 255, 0.2);
  }
  70% {
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45), 0 0 0 16px rgba(255, 255, 255, 0);
  }
  100% {
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45), 0 0 0 0 rgba(255, 255, 255, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .avfb-floating-btn {
    transition: none;
  }
  .avfb-floating-btn:hover {
    animation: none;
    transform: none;
  }
}