:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "Noto Sans", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
body { font-family: var(--font-sans); }

/* optional stability tweaks */
.navbar-brand img { max-height: 48px; height: auto; }
img { max-width: 100%; height: auto; }

.page-subtitle-minor {
  font-size: 1.4rem;          /* smaller than subtitle */
  font-weight: 400;
  line-height: 1.4;
  margin-top: 0.05rem;      /* snug under subtitle */
  text-align: center;
  color: #FFFFFF;              /* lighter so it doesn't compete */
}

/* If your header has extra spacing you want to tighten: */
/* .intro-header .page-subtitle + .page-subtitle-minor { margin-top: 0.25rem; } */