/* Vietnamese-safe local typography; no external font request. */
html body,
html body button,
html body input,
html body select,
html body textarea {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif !important;
}
html body h1,
html body h2,
html body h3,
html body h4,
html body h5,
html body h6,
html body .heading-font,
html body .nav > li > a {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif !important;
}