:root{--mb-color:#0c2b5a}
.mbai-launch{position:fixed;right:18px;bottom:18px;background:var(--mb-color);color:#fff;border-radius:28px;width:56px;height:56px;border:none;cursor:pointer;z-index:999999}
.mbai-widget{position:fixed;right:18px;bottom:84px;width:100%;max-width:480px;background:#fff;border-radius:12px;display:none}
.mbai-widget.open{display:block}