/* === Zero Block submenu base === */
.zb-submenu-panel {
    opacity: 0;
    transform: translateY(8px);
    pointer-events: none;
    transition: opacity .18s ease, transform .18s ease;
    z-index: 999999; /* 确保在最上层 */
}

/* 显示态（JS 会加这个 class） */
.zb-submenu-panel.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* 可选：避免导航栏被其它block遮挡 */
.zb-nav-root {
    position: relative;
    z-index: 999998;
}