.mvp-back-to-top {
  position: fixed;
  z-index: 99990;
  right: 24px;
  bottom: 92px;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  padding: 0;
  color: #fff;
  background: linear-gradient(145deg, #0877ff, #075bd8);
  border: 1px solid rgba(255, 255, 255, .72);
  border-radius: 50%;
  box-shadow: 0 10px 28px rgba(5, 58, 151, .28);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  cursor: pointer;
  transition: opacity .25s ease, visibility .25s ease, transform .25s ease, box-shadow .25s ease;
}

.mvp-back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mvp-back-to-top:hover,
.mvp-back-to-top:focus-visible {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(5, 58, 151, .38);
  outline: none;
}

.mvp-back-to-top svg {
  width: 21px;
  height: 21px;
}

@media (max-width: 640px) {
  .mvp-back-to-top {
    right: 15px;
    bottom: 86px;
    width: 44px;
    height: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mvp-back-to-top { transition: none; }
}