/* Discrete, center-bottom back-to-top affordance. Keeps both screen corners free. */
.candeia-back-to-top{
  position:fixed;
  left:50%;
  bottom:max(14px,env(safe-area-inset-bottom));
  z-index:1150;
  width:38px;
  height:34px;
  display:grid;
  place-items:center;
  padding:0;
  border:1px solid color-mix(in srgb,var(--navy) 18%,transparent);
  border-radius:999px;
  background:color-mix(in srgb,var(--white) 88%,transparent);
  color:var(--navy);
  box-shadow:0 8px 22px rgba(4,31,54,.12);
  -webkit-backdrop-filter:blur(10px) saturate(120%);
  backdrop-filter:blur(10px) saturate(120%);
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transform:translate(-50%,10px);
  transition:opacity .18s ease,transform .18s ease,visibility .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease,box-shadow .18s ease;
  cursor:pointer;
}
.candeia-back-to-top svg{width:17px;height:17px;display:block;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;fill:none}
.candeia-back-to-top.is-visible{opacity:.78;visibility:visible;pointer-events:auto;transform:translate(-50%,0)}
.candeia-back-to-top.is-visible:hover{opacity:1;background:var(--navy);color:var(--white);border-color:var(--navy);box-shadow:0 10px 26px rgba(4,31,54,.18)}
.candeia-back-to-top:focus-visible{opacity:1;outline:3px solid color-mix(in srgb,var(--accent) 72%,white);outline-offset:3px}
html[data-theme="dark"] .candeia-back-to-top{background:color-mix(in srgb,var(--navy) 84%,transparent);color:var(--ivory);border-color:rgba(255,255,255,.2);box-shadow:0 8px 24px rgba(0,0,0,.28)}
html[data-theme="dark"] .candeia-back-to-top.is-visible:hover{background:var(--ivory);color:var(--navy);border-color:var(--ivory)}
@media(max-width:600px){
  .candeia-back-to-top{width:42px;height:42px;bottom:max(12px,env(safe-area-inset-bottom))}
  .candeia-back-to-top svg{width:18px;height:18px}
}
@media(prefers-reduced-motion:reduce){
  .candeia-back-to-top{transition:none}
}