/* ============================
   BACK TO TOP — SUPER PREMIUM ELEGANTE
============================ */

#scroll-top.scroll-top {
    position: fixed;
    right: 15px;
    bottom: 15px;
    width: 52px;
    height: 52px;

    background: linear-gradient(145deg, #4d798b, #3b5f6d);
    border-radius: 14px;

    display: flex;
    justify-content: center;
    align-items: center;

    visibility: hidden;
    opacity: 0;

    /* 3D elegante + alone soft */
    box-shadow:
        0 0 14px rgba(77, 121, 139, 0.35),
        /* alone soft blu */
        0 6px 14px rgba(0, 0, 0, 0.30),
        /* ombra principale */
        inset 0 3px 5px rgba(255, 255, 255, 0.15),
        /* highlight interno */
        inset 0 -3px 7px rgba(0, 0, 0, 0.22);
    /* rilievo interno */

    transition:
        opacity 0.35s ease,
        transform 0.35s ease,
        box-shadow 0.35s ease,
        background 0.35s ease;

    z-index: 999999 !important;
}

/* Icona */
#scroll-top.scroll-top i {
    font-size: 28px;
    color: #ffffff;
    line-height: 1;
    transform: translateY(-1px);
    filter: drop-shadow(0 0 2px rgba(255, 255, 255, 0.6));
    transition: 0.25s ease;
}

/* Hover — sollevamento elegante */
#scroll-top.scroll-top:hover {
    transform: translateY(-5px);

    background: linear-gradient(145deg, #5a8aa0, #3b5f6d);

    box-shadow:
        0 0 18px rgba(77, 121, 139, 0.40),
        /* alone soft più forte */
        0 12px 22px rgba(0, 0, 0, 0.35),
        inset 0 4px 6px rgba(255, 255, 255, 0.18),
        inset 0 -4px 8px rgba(0, 0, 0, 0.28);
}

#scroll-top.scroll-top:hover i {
    color: #e6eef1;
    filter: drop-shadow(0 0 3px rgba(230, 238, 241, 0.8));
}

/* Attivazione */
#scroll-top.scroll-top.active {
    visibility: visible;
    opacity: 1;
}

/* ============================
   CLICK — compressione morbida
============================ */

#scroll-top.scroll-top:active {
    transform: translateY(-1px) scale(0.95);

    box-shadow:
        0 0 10px rgba(77, 121, 139, 0.30),
        0 4px 10px rgba(0, 0, 0, 0.30),
        inset 0 3px 5px rgba(255, 255, 255, 0.12),
        inset 0 -3px 6px rgba(0, 0, 0, 0.20);
}

/* ============================
   MOBILE
============================ */

@media (max-width: 768px) {
    #scroll-top.scroll-top {
        width: 56px;
        height: 56px;
        bottom: 22px;
        right: 22px;
    }

    #scroll-top.scroll-top i {
        font-size: 32px;
    }
}

/* ============================
   FIX NAVBAR MOBILE
============================ */

@media (max-width: 900px) {
    .main-nav {
        pointer-events: none;
    }

    .main-nav.open {
        pointer-events: auto;
    }
}