.boostful-back-to-top {
  position: fixed;
  right: clamp(1rem, 2vw, 2rem);
  bottom: clamp(1rem, 2vw, 2rem);
  z-index: 100;
  display: grid;
  width: 54px;
  height: 54px;
  place-items: center;
  border: 1px solid rgba(20, 20, 20, 0.18);
  border-radius: 50%;
  background: rgba(247, 247, 247, 0.92);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.22);
  color: #ff3c00;
  cursor: pointer;
  opacity: 1;
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.boostful-back-to-top:hover {
  background: #fff;
  box-shadow: 0 7px 22px rgba(0, 0, 0, 0.3);
  transform: translateY(-3px);
}

.boostful-back-to-top:active {
  transform: translateY(0) scale(0.96);
}

.boostful-back-to-top:focus-visible {
  outline: 2px solid #ff3c00;
  outline-offset: 4px;
}

.boostful-back-to-top svg {
  width: 25px;
  height: 25px;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2.8;
  fill: none;
}

@media (max-width: 640px) {
  .boostful-back-to-top {
    width: 48px;
    height: 48px;
  }
}