.back-to-top{z-index:60;border:1.5px solid var(--color-border-strong);background:var(--color-surface);width:2.75rem;height:2.75rem;color:var(--color-text-strong);cursor:pointer;opacity:0;visibility:hidden;border-radius:999px;justify-content:center;align-items:center;font-family:inherit;font-size:1.15rem;line-height:1;transition:opacity .2s,transform .2s,visibility .2s,background .2s;display:inline-flex;position:fixed;bottom:clamp(.75rem,3vw,1.5rem);right:clamp(.75rem,3vw,1.5rem);transform:translateY(.5rem);box-shadow:0 6px 18px -8px #1f472580}.back-to-top--visible{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:hover{background:var(--color-accent-soft)}.back-to-top:focus-visible{outline:2px solid var(--color-accent-2);outline-offset:2px}@media (prefers-reduced-motion:reduce){.back-to-top{transition:none}}