.sdh-difficult-head{padding:16px 6px;background:#fff;border-bottom:1px solid var(--sdh-line)}
.sdh-difficult-head h1{margin:11px 0 6px;font-size:25px;line-height:1.2}
.sdh-difficult-head p{margin:0;color:var(--sdh-muted);font-size:13.5px;line-height:1.5}