.topic-share{display:flex;align-items:center;gap:8px;border-top:1px solid var(--line);padding-top:16px;margin-top:18px}
.topic-share input{flex:1;min-width:0;margin:0;font-size:16px;padding:10px}
.topic-share .btn{flex-shrink:0}
.sub-topic-navigation:has(a:not([hidden])){margin:0 0 18px;text-align:center}
.sub-topic-navigation a[hidden]{display:none}