.tutl nav{max-height:calc(100vh - 110px);overflow-y:auto;overscroll-behavior:contain}
.tutl nav a{position:relative;transition:background .15s,color .15s}
.tutl nav a.on{background:var(--hot-soft);color:var(--fg)}
.tutl nav a.on::before{content:"";position:absolute;left:0;top:8px;bottom:8px;width:3px;border-radius:3px;background:var(--hot)}
@media (max-width:900px){.tutl nav{max-height:none;overflow:visible}}