.back-to-top{appearance:none;position:fixed;right:19px;bottom:34px;z-index:900;width:56px;min-height:58px;display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:7px 4px 6px;border:0;border-radius:5px;background:#fff;color:#334155;cursor:pointer;opacity:0;box-shadow:0 1px 5px #0f172a1f;font:inherit;transition:transform .15s,box-shadow .15s,color .15s,background .15s,opacity .2s}.back-to-top span{font-size:12px;font-weight:500;line-height:1.2;white-space:nowrap}.back-to-top[hidden]{display:none}.back-to-top.is-on{opacity:1}.back-to-top:hover{color:#2563eb;transform:translateY(-2px);box-shadow:0 3px 8px #0f172a24}.back-to-top:focus-visible{outline:2px solid #2563eb;outline-offset:2px}.back-to-top:active{transform:translateY(0)}[data-theme=dark] .back-to-top{background:#151e2e;color:#cbd5e1;box-shadow:0 1px 5px #0006}[data-theme=dark] .back-to-top:hover{color:#7eaaf5;background:#1b2639}@media(max-width:860px){.back-to-top{display:none!important}}@media(prefers-reduced-motion:reduce){.back-to-top{transition:none}}@media print{.back-to-top{display:none!important}}body{background:var(--bg)}