.bb-nav>h1{font-size:1em}.bb-nav-placeholder{height:4rem}.bb-nav-placeholder .bb-nav-root.persist-nav{z-index:1}@keyframes show-persistent-header{from{position:fixed;top:-64px}to{position:fixed;top:0}}@keyframes hide-persistent-header{from{position:fixed;top:0}to{position:fixed;top:-64px}}:lang(ja) .bb-nav-root.persist-nav{position:fixed;top:0}:lang(ja) .bb-nav-root.persist-nav .bb-nav{animation:show-persistent-header .3s ease-in}:lang(ja) .bb-nav-root.hide-nav .bb-nav{animation:hide-persistent-header .3s ease-in}