/* 全站系统字体 — 不依赖 Google Fonts / 外部 CDN */
body,
h1, h2, h3, h4, h5, h6,
.btn,
.navbar,
.nav-link,
.lead-in-title,
p, li, a, span, button, input, textarea, select {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif !important;
}