.back-to-top{background:#ff0087;border:none;border-radius:999px;bottom:calc(clamp(12px, 2vw, 24px) + env(safe-area-inset-bottom, 0));box-shadow:0 6px 20px rgba(0,0,0,.2);color:#fff;cursor:pointer;display:grid;height:44px;justify-content:center;opacity:0;place-items:center;pointer-events:none;position:fixed;right:clamp(12px,2vw,24px);transform:translateY(12px) scale(.95);transition:opacity .25s,transform .25s;width:44px;z-index:1000}.back-to-top.is-visible{opacity:1;pointer-events:auto;transform:translateY(0) scale(1)}.back-to-top:focus-visible{outline:2px solid #fff;outline-offset:2px}@media (prefers-reduced-motion:reduce){.back-to-top{transition:none}}