/* Shared, quiet navigation for long storefront and admin pages. */
button.back-to-top {
    position: fixed;
    right: max(16px, env(safe-area-inset-right));
    bottom: calc(20px + env(safe-area-inset-bottom));
    z-index: 25;
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    min-width: 0;
    padding: 0;
    border: 1px solid #d6deea;
    border-radius: 50%;
    background: #fff;
    color: #36547d;
    box-shadow: 0 3px 12px rgb(20 40 70 / 10%);
    cursor: pointer;
}
button.back-to-top[hidden] { display: none; }
button.back-to-top:hover { background: #edf2f9; border-color: #9aacc6; }
button.back-to-top:focus-visible { outline: 3px solid #4269b1; outline-offset: 3px; }
button.back-to-top svg { width: 20px; height: 20px; pointer-events: none; }
@media print { button.back-to-top { display: none; } }