.mm-navigation-busy {
    position: fixed;
    inset: 0;
    z-index: 12050;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: .7rem;
    background: rgba(4, 13, 23, .28);
    backdrop-filter: blur(2px);
    pointer-events: all;
}

.mm-navigation-busy[hidden] {
    display: none !important;
}

/* Durante la navigazione parziale il nuovo main viene montato, stilizzato e
   inizializzato dietro al loader. visibility:hidden conserva il layout senza
   mostrare agli utenti i passaggi intermedi o gli spostamenti degli elementi. */
html.mm-page-transitioning main[role="main"] {
    visibility: hidden;
}

.mm-navigation-busy__visual {
    position: relative;
    display: grid;
    width: 4.35rem;
    height: 4.35rem;
    place-items: center;
    border-radius: 50%;
    background: rgba(6, 20, 34, .92);
    box-shadow:
        0 14px 34px rgba(0, 0, 0, .32),
        inset 0 0 0 1px rgba(88, 166, 255, .08),
        0 0 1.5rem rgba(88, 166, 255, .1);
}

.mm-navigation-busy__ring {
    position: absolute;
    inset: .18rem;
    border: 1.5px solid rgba(88, 166, 255, .12);
    border-top-color: rgba(88, 166, 255, .96);
    border-right-color: rgba(88, 166, 255, .48);
    border-radius: 50%;
    box-shadow: 0 0 .9rem rgba(88, 166, 255, .14);
    animation: mm-navigation-busy-ring 1.05s linear infinite;
}

.mm-navigation-busy__wave {
    position: relative;
    z-index: 1;
    display: inline-flex;
    width: 2.1rem;
    height: 1rem;
    align-items: center;
    justify-content: center;
    gap: 2px;
    color: var(--mm-accent-2, #58a6ff);
}

.mm-navigation-busy__wave > span {
    display: block;
    width: 2px;
    height: .78rem;
    border-radius: 999px;
    background: currentColor;
    transform-origin: center;
    animation: mm-navigation-busy-wave .72s ease-in-out infinite alternate;
}

.mm-navigation-busy__wave > span:nth-child(2) { animation-delay: -.48s; }
.mm-navigation-busy__wave > span:nth-child(3) { animation-delay: -.22s; }
.mm-navigation-busy__wave > span:nth-child(4) { animation-delay: -.58s; }
.mm-navigation-busy__wave > span:nth-child(5) { animation-delay: -.31s; }
.mm-navigation-busy__wave > span:nth-child(6) { animation-delay: -.65s; }
.mm-navigation-busy__wave > span:nth-child(7) { animation-delay: -.14s; }

.mm-navigation-busy__label {
    padding: .34rem .66rem;
    border: 1px solid rgba(88, 166, 255, .1);
    border-radius: 999px;
    background: rgba(6, 20, 34, .88);
    color: #aebdcb;
    box-shadow: 0 8px 18px rgba(0, 0, 0, .18);
    font-size: .7rem;
    font-weight: 620;
    letter-spacing: .035em;
}

body.mm-navigation-busy-active {
    cursor: wait;
}

@keyframes mm-navigation-busy-ring {
    to { transform: rotate(360deg); }
}

@keyframes mm-navigation-busy-wave {
    0% {
        opacity: .42;
        transform: scaleY(.22);
    }

    45% {
        opacity: .9;
        transform: scaleY(.72);
    }

    100% {
        opacity: 1;
        transform: scaleY(1.18);
    }
}

@media (prefers-reduced-motion: reduce) {
    .mm-navigation-busy__ring,
    .mm-navigation-busy__wave > span {
        animation: none;
    }

    .mm-navigation-busy__wave > span:nth-child(odd) {
        transform: scaleY(.55);
    }
}