/*
 * Botón atrás — portal usuario Netzerd
 */
.nz-history-nav {
    position: fixed;
    z-index: 1150;
    left: max(12px, env(safe-area-inset-left, 0px));
    bottom: calc(5.75rem + env(safe-area-inset-bottom, 0px));
    display: flex;
    align-items: center;
    padding: 4px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(0, 58, 140, 0.12);
    box-shadow: 0 4px 20px -4px rgba(0, 58, 140, 0.18), 0 2px 8px rgba(15, 23, 42, 0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.nz-history-nav__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    border-radius: 999px;
    background: transparent;
    color: #003a8c;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease, transform 0.12s ease, opacity 0.15s ease;
}

.nz-history-nav__btn .material-symbols-outlined {
    font-size: 22px;
    line-height: 1;
}

.nz-history-nav__btn:hover:not(:disabled) {
    background: rgba(0, 58, 140, 0.08);
    color: #002660;
}

.nz-history-nav__btn:active:not(:disabled) {
    transform: scale(0.94);
}

.nz-history-nav__btn:disabled,
.nz-history-nav__btn.is-disabled {
    opacity: 0.38;
    cursor: default;
    pointer-events: none;
}

@media (min-width: 768px) {
    .nz-history-nav {
        left: max(20px, env(safe-area-inset-left, 0px));
        bottom: max(24px, env(safe-area-inset-bottom, 0px));
        top: auto;
    }

    .nz-history-nav__btn {
        width: 44px;
        height: 44px;
    }
}

@media (min-width: 1024px) {
    .nz-history-nav {
        top: calc(5.5rem + env(safe-area-inset-top, 0px));
        bottom: auto;
    }
}