.toc-reference{-webkit-transition:opacity .6s;transition:opacity .6s}.h7>.toc-reference,.h8>.toc-reference,h1>.toc-reference,h2>.toc-reference,h3>.toc-reference,h4>.toc-reference,h5>.toc-reference,h6>.toc-reference{opacity:0}:hover>.toc-reference{opacity:1}.toc-reference:hover{text-decoration:none}.toc-reference::after{content:'↑'}.toc-reference[data-icon]::after{content:attr(data-icon)}