/* Back-to-top floating button. Sitewide, bottom-right, all viewports. */
#back-to-top{position:fixed;right:20px;bottom:20px;z-index:70;width:44px;height:44px;border-radius:999px;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:center;border:0;cursor:pointer;box-shadow:0 10px 24px -6px rgba(23,33,46,0.35);opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .2s,transform .2s,visibility .2s,background .15s}
#back-to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
#back-to-top:hover{background:var(--accent)}
#back-to-top svg{width:20px;height:20px}