.catalog-back-to-top {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 30;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid var(--accent);
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 4px 16px #0006;
  cursor: pointer;
}
.catalog-back-to-top[hidden] { display: none; }
.catalog-back-to-top:hover { filter: brightness(1.1); }
.catalog-back-to-top:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; }
.catalog-back-to-top svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }