.site-back-to-top {
  position: fixed;
  right: clamp(16px, 2.8vw, 36px);
  bottom: clamp(22px, 4vw, 40px);
  z-index: 60;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: clamp(2.9rem, 3.6vw, 3.2rem);
  height: clamp(2.9rem, 3.6vw, 3.2rem);
  border: 1px solid var(--color-primary-deep);
  border-radius: 999px;
  color: #ffffff;
  background: var(--color-primary);
  box-shadow:
    0 10px 24px rgba(0, 63, 115, 0.18),
    0 0 0 8px rgba(0, 104, 183, 0.12);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(18px) scale(0.94);
  transition:
    opacity 0.26s ease,
    transform 0.26s ease,
    box-shadow 0.26s ease,
    background-color 0.26s ease,
    border-color 0.26s ease;
}

.site-back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.site-back-to-top:hover,
.site-back-to-top:focus-visible {
  border-color: var(--color-primary-dark);
  background: var(--color-primary-deep);
  box-shadow:
    0 14px 28px rgba(0, 63, 115, 0.24),
    0 0 0 10px rgba(0, 104, 183, 0.16);
  transform: translateY(-2px);
}

.site-back-to-top:focus-visible {
  outline: 3px solid rgba(0, 104, 183, 0.22);
  outline-offset: 3px;
}

.site-back-to-top__icon {
  position: relative;
  z-index: 1;
  display: inline-block;
  width: 1.15rem;
  height: 1.15rem;
  background: center / contain no-repeat url("../images/icons/back-to-top.svg");
  transform: translateY(2px);
}

@media (max-width: 767.98px) {
  .site-back-to-top {
    width: 3rem;
    height: 3rem;
  }
}