html {
  font-size: 18px;
    -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* iOS Safari 专属 */
@supports (-webkit-touch-callout: none) {
  html {
    font-size: 18px;
  }
}

body {
  font-size: 1rem;
  line-height: 1.5;

  /* ⭐英文网站标准字体栈 */
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    "Apple Color Emoji",
    "Segoe UI Emoji",
    "Segoe UI Symbol",
    sans-serif;

  color: #404040;
  padding-top: 0;
}

.container {
  padding-top: 0;
}

.navbar-fixed-top,
.navbar-fixed-bottom {
  position: relative;
}