/* Nút Zalo nổi, dùng chung mọi trang */
.zalo-fab{position:fixed;right:18px;bottom:18px;z-index:60;display:inline-flex;align-items:center;gap:.5rem;
  padding:.72rem 1.05rem .72rem .85rem;border-radius:999px;background:#0068FF;color:#fff;text-decoration:none;
  font:600 .95rem/1 "Be Vietnam Pro","Segoe UI",system-ui,sans-serif;box-shadow:0 10px 26px -8px rgba(0,60,160,.55);
  transition:transform .25s ease,background .25s ease}
.zalo-fab:hover{transform:translateY(-2px);background:#0054CC}
.zalo-fab:focus-visible{outline:3px solid #2A2118;outline-offset:2px}
.zalo-fab svg{width:22px;height:22px;flex:none}
@media print{.zalo-fab{display:none}}