/* Nút quay về trang tổng (chèn bởi tools-src/build_hub.py) */
.hub-left{display:flex;align-items:center;gap:10px;min-width:0}
.hub-back{display:inline-flex;align-items:center;gap:4px;flex:none;text-decoration:none;font:inherit;font-weight:800;font-size:.8rem;line-height:1;
  padding:7px 11px;border-radius:999px;color:var(--pri,#6366f1);background:var(--card,#fff);border:2px solid var(--line,rgba(0,0,0,.12));white-space:nowrap;transition:transform .12s}
.hub-back:hover{transform:translateX(-2px)}.hub-back:focus-visible{outline:3px solid var(--pri,#6366f1);outline-offset:2px}
@media (max-width:560px){.hub-left{flex-direction:column;align-items:flex-start;gap:4px}.hub-back{font-size:.72rem;padding:5px 9px}}