.masthead__menu {
  display: flex;
  align-items: center;
  gap: .8rem;
}

#site-nav {
  flex: 1;
  min-width: 0;
}

.language-switch {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid #e0e8f2;
  border-radius: 999px;
  background: #f8fafc;
}

.language-switch button {
  padding: .35rem .6rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #64748b;
  font: inherit;
  font-size: .8rem;
  font-weight: 600;
  line-height: 1.35;
  white-space: nowrap;
  cursor: pointer;
}

.language-switch button[aria-pressed="true"] {
  background: #eaf2ff;
  color: #174ea6;
}

.language-switch button:hover {
  color: #174ea6;
}

.language-switch button:focus-visible {
  outline: 2px solid #174ea6;
  outline-offset: 2px;
}

html[lang="zh-CN"] body,
html[lang="zh-CN"] h1,
html[lang="zh-CN"] h2,
html[lang="zh-CN"] h3 {
  font-family: "Trebuchet MS", "PingFang SC", "Microsoft YaHei", Helvetica, sans-serif;
}

@media (max-width: 680px) {
  .masthead__menu {
    align-items: flex-start;
    gap: .35rem;
  }

  .language-switch {
    margin-top: .6rem;
  }

  .language-switch button {
    padding: .35rem .45rem;
  }
}