/* Shared floating back-to-top control. */
.back-to-top { position:fixed; right:24px; bottom:24px; z-index:30; display:inline-flex; align-items:center; gap:8px; min-height:46px; padding:0 14px; border:1px solid #102e3d; background:#102e3d; color:#fbfcfa; box-shadow:4px 4px 0 rgba(11,113,109,.24); font:700 12px/1 Arial,Helvetica,sans-serif; cursor:pointer; opacity:0; pointer-events:none; transform:translateY(12px); transition:opacity .18s ease,transform .18s ease,background-color .18s ease; }
.back-to-top.is-visible { opacity:1; pointer-events:auto; transform:translateY(0); }
.back-to-top:hover { background:#0b716d; }
.back-to-top:focus-visible { outline:3px solid #db7247; outline-offset:3px; }
.back-to-top .lucide { display:block; width:18px; height:18px; flex:0 0 18px; }
@media(max-width:760px) { .back-to-top { right:16px; bottom:16px; width:48px; min-height:48px; justify-content:center; padding:0; } .back-to-top span { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; } }
@media(prefers-reduced-motion:reduce) { .back-to-top { transition:none; } }