/* A contents index and real heading levels for the preserved long-form text. */
.page-reading-index{margin-block:26px 32px;border-block:1px solid var(--surface-edge,var(--line))}
.page-reading-index>summary{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:58px;padding-block:14px;font-size:17px;font-weight:750;line-height:1.5;cursor:pointer;list-style:none}
.page-reading-index>summary::-webkit-details-marker{display:none}
.page-reading-index>summary>span{font-size:24px;font-weight:500;color:var(--red-dark)}
.page-reading-index[open]>summary>span{transform:rotate(45deg)}
.page-reading-index nav{padding:0 0 18px}
.page-reading-index ul{list-style:none;margin:0;padding:0}
.page-reading-index li{margin:0}
.page-reading-index ul ul{margin-left:9px;padding-left:18px;border-left:1px solid var(--surface-edge,var(--line))}
.page-reading-index a{display:inline-flex;align-items:center;min-height:44px;padding-block:7px;font-size:16px;font-weight:600;line-height:1.5;text-decoration:underline;text-underline-offset:4px}
.readable-page .page-reading-heading{max-width:100%;scroll-margin-top:12px;line-height:1.4;text-wrap:pretty}
.readable-page h2.page-reading-heading{font-size:27px;margin-block:38px 18px}
.readable-page h3.page-reading-heading{font-size:22px;margin-block:28px 14px}
.page-reading-index:focus-visible,.page-reading-index>summary:focus-visible,.page-reading-heading:focus-visible{outline:2px solid var(--red);outline-offset:6px}
.page-reading-return{border-top:1px solid var(--line);padding-top:20px;margin-top:32px}
@media(max-width:600px){.readable-page h2.page-reading-heading{font-size:24px;margin-top:30px}.readable-page h3.page-reading-heading{font-size:21px}.page-reading-index{margin-block:22px 28px}}
@media print{.page-reading-index,.page-reading-return{display:none}}