nav.nfs-float {
    --nfs-button-size: var(--nfs-size);
    --nfs-floor: min(var(--nfs-bottom), 28vh);
    position: fixed;
    z-index: 9999;
    bottom: calc(var(--nfs-floor) + env(safe-area-inset-bottom, 0px));
    display: flex;
    flex-direction: column;
    gap: var(--nfs-gap);
    box-sizing: border-box;
    margin: 0;
    padding: 5px;
    width: max-content;
    max-height: calc(100vh - var(--nfs-floor) - env(safe-area-inset-bottom, 0px) - 8px);
    max-height: calc(100dvh - var(--nfs-floor) - env(safe-area-inset-bottom, 0px) - 8px);
    overflow: auto;
    overscroll-behavior: contain;
    scrollbar-width: none;
    background: none;
    border: 0;
}
nav.nfs-float::-webkit-scrollbar { display: none; }
nav.nfs-float.nfs-left { left: calc(var(--nfs-edge) + env(safe-area-inset-left, 0px)); right: auto; }
nav.nfs-float.nfs-right { right: calc(var(--nfs-edge) + env(safe-area-inset-right, 0px)); left: auto; }
nav.nfs-float a.nfs-button {
    display: grid;
    place-items: center;
    flex: none;
    width: var(--nfs-button-size);
    height: var(--nfs-button-size);
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 50%;
    box-sizing: border-box;
    background: var(--nfs-bg);
    color: var(--nfs-ink);
    text-decoration: none;
    box-shadow: 0 2px 5px #0003;
}
nav.nfs-float.nfs-rounded a.nfs-button { border-radius: 28%; }
nav.nfs-float a.nfs-button svg { display: block; width: var(--nfs-icon); height: var(--nfs-icon); fill: currentColor; pointer-events: none; }
nav.nfs-float a.nfs-button:focus-visible { outline: 2px solid #152238; outline-offset: 2px; box-shadow: 0 0 0 2px #fff; }
@media (hover: hover) {
    nav.nfs-float a.nfs-button:hover { filter: brightness(1.13); }
}
@media (max-width: 767px) {
    nav.nfs-float { --nfs-button-size: var(--nfs-mobile); }
    nav.nfs-float.nfs-device-desktop { display: none; }
}
@media (min-width: 768px) {
    nav.nfs-float.nfs-device-mobile { display: none; }
}