/* =========================================================================
   Scroll-to-top button
   ========================================================================= */
.scroll-top {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  width: 52px;
  height: 52px;
  background: var(--gold);
  color: var(--navy);
  border-radius: 999px;
  border: 0;
  display: grid;
  place-items: center;
  cursor: pointer;
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease, background .2s ease;
  box-shadow: 0 10px 26px rgba(10,37,64,0.35), 0 0 0 6px rgba(253,185,19,0.15);
}
.scroll-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.scroll-top:hover {
  background: #ffc733;
  transform: translateX(-50%) translateY(-3px);
}
.scroll-top svg {
  width: 22px;
  height: 22px;
  stroke-width: 3;
}
@media (max-width: 640px) {
  .scroll-top { bottom: 18px; width: 46px; height: 46px; }
}