#floating-scroll {
  position: fixed;
  right: 16px;
  bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9999;
  pointer-events: none;
}
.float-btn {
  pointer-events: auto;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  border: none;
  background: rgba(0,0,0,0.6);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 16px rgba(0,0,0,0.25);
  transition: transform .15s ease, opacity .15s ease;
  opacity: 0.95;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.float-btn:active { transform: translateY(1px) scale(.98); }
.float-btn.hidden {
  opacity: 0;
  transform: scale(.9);
  pointer-events: none;
}