/* index.htm / landing.html: 言語切替（?lang=en|ja）で .i3-lang-root を表示切替 */
html.i3-lang-ja .i3-lang-root[data-i3-lang="en"] {
  display: none !important;
}
html.i3-lang-en .i3-lang-root[data-i3-lang="ja"] {
  display: none !important;
}