.back-to-top {
    position: fixed;
    right: max(1.25rem, env(safe-area-inset-right));
    bottom: calc(1.25rem + env(safe-area-inset-bottom));
    z-index: 15;
    display: grid;
    place-items: center;
    box-sizing: border-box;
    width: 48px;
    height: 48px;
    padding: 0;
    border: 1px solid #fff;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 16px rgb(23 59 52 / 22%);
    cursor: pointer;
    transition: background-color .15s ease, box-shadow .15s ease;
}
.back-to-top[hidden] { display: none; }
.back-to-top:hover { background: #123e2d; box-shadow: 0 6px 20px rgb(23 59 52 / 30%); }
.back-to-top:focus-visible { outline: 3px solid #123e2d; outline-offset: 4px; }
@media (max-width: 850px) {
    .back-to-top-above-navigation { bottom: calc(64px + 1.25rem + env(safe-area-inset-bottom)); }
}
@media (prefers-reduced-motion: reduce) {
    .back-to-top { transition: none; }
}
@media print {
    .back-to-top { display: none !important; }
}