/* ==========================================================================
   Utilities
   ========================================================================== */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 40;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--brand-500), var(--brand-800));
  color: #fff;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.back-to-top.show {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.back-to-top:hover {
  filter: brightness(1.1);
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}