/* 2ip components/shared-ui/totop-layout; Speedtest semantic colors and container. */
.totop-mount {display:flex;justify-content:flex-end}
/* Fixed geometry exists before the scroll controller initializes. */
a.totop {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  --twoip-totop-button-size: 55px;
  --twoip-totop-container-gap: 20px;
  width: var(--twoip-totop-button-size);
  height: var(--twoip-totop-button-size);
  box-sizing: border-box;
  border: 0;
  text-decoration: none;
  font-size: 24px;
  line-height: 1;
  position: fixed;
  --twoip-totop-right: 16px;
  --twoip-totop-bottom: 24px;
  right: calc(var(--twoip-totop-right) + env(safe-area-inset-right, 0px));
  --twoip-totop-resting-inset: calc(var(--twoip-totop-bottom) + env(safe-area-inset-bottom, 0px) + var(--twoip-totop-viewport-inset, 0px));
  bottom: max(var(--twoip-totop-content-offset, 0px), calc(var(--twoip-totop-resting-inset) * (1 - var(--twoip-totop-end-progress, 0)) + var(--twoip-totop-content-offset, 0px) * var(--twoip-totop-end-progress, 0)));
  z-index: 1030;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
a.totop.totop-visible { opacity: 1; visibility: visible; pointer-events: auto; }
@media (min-width: 1100px) {
  a.totop { --twoip-totop-bottom: 86px; }
}

body a.totop > .twoip-icon { display: flex; align-items: center; justify-content: center; width: 1em; height: 1em; font-size: inherit; line-height: 1; margin: 0; color: currentColor; }
body a.totop { border: 1px solid var(--twoip-outline-variant); border-radius: var(--twoip-radius-medium); background: var(--twoip-surface); color: var(--twoip-primary); box-shadow: var(--twoip-elevation-1); transition: background-color .15s ease, box-shadow .15s ease; }
body a.totop:focus-visible { background: var(--twoip-primary-container); color: var(--twoip-primary); border-color: var(--twoip-primary); box-shadow: var(--twoip-elevation-1); }
body a.totop:active { background: color-mix(in srgb, var(--twoip-primary-container) 75%, var(--twoip-primary)); color: var(--twoip-primary); box-shadow: var(--twoip-elevation-1); }
@media (hover:hover) and (pointer:fine) {
 body a.totop:hover { background: var(--twoip-primary-container); color: var(--twoip-primary); border-color: var(--twoip-primary); box-shadow: var(--twoip-elevation-1); }
}
body a.totop:focus-visible {outline:2px solid var(--twoip-primary);outline-offset:3px}
@media (prefers-reduced-motion:reduce) {body a.totop {transition:none}}

/* Fixed vertical behavior stays with the existing To Top controller. */
body a.totop {
  /* Percentages use the layout viewport, excluding the scrollbar unlike 100vw. */
  right: max(
    calc(var(--twoip-totop-right) + env(safe-area-inset-right, 0px)),
    calc((100% - min(100%, var(--st-page-width))) / 2 + var(--st-page-inset) - var(--twoip-totop-container-gap) - var(--twoip-totop-button-size))
  );
}