.nd-back-to-top {
    position: fixed;
    right: max(18px, env(safe-area-inset-right));
    bottom: max(18px, env(safe-area-inset-bottom));
    z-index: 40;
    display: grid;
    place-items: center;
    width: 48px;
    height: 48px;
    padding: 0;
    border: 1px solid #B87952;
    border-radius: 50%;
    background: #0B2444;
    color: #F7F1E6;
    box-shadow: 0 3px 12px #0B244433;
    cursor: pointer;
}
.nd-back-to-top[hidden] { display: none; }
.nd-back-to-top:hover { background: #163b63; }
.nd-back-to-top:focus-visible { outline: 3px solid #B87952; outline-offset: 3px; }
.nd-back-to-top svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }