/* Teaching Wiki: a steady reading column, lesson navigation, and page outline. */
.wiki-page{background:var(--paper,#f7f7f4);color:var(--ink,#20242b)}
.wk-header{position:sticky;top:0;z-index:30;background:var(--paper,#fafaf8);border-bottom:1px solid var(--line,#dedfdf)}
.wk-header-inner{max-width:1540px;height:80px;margin:auto;padding:0 36px;display:flex;justify-content:space-between;align-items:center;gap:24px}
.wk-header .brand{font-size:16px;gap:12px;line-height:1.2}
.wk-header .brand-mark{display:block;width:63px;height:30px;object-fit:contain;flex:none}
.wk-header .brand small{display:block;color:var(--muted,#70747d);font-size:13px;font-weight:400;margin-top:6px;letter-spacing:.02em}
.wk-header nav{display:flex;align-items:center;gap:32px;font-size:14px}
.wk-header-wiki{color:var(--accent,#c21f3a)}
.wiki-mobile-menu,.wk-nav-close{display:none}
.wk-layout{max-width:1540px;margin:0 auto;padding:48px 36px 80px;display:grid;grid-template-columns:218px minmax(0,760px) 190px;gap:42px;align-items:start;justify-content:space-between}
.wk-sidebar{position:sticky;top:112px;max-height:calc(100dvh - 144px);overflow:auto;padding:0 12px 15px 0;scrollbar-width:thin;scrollbar-color:#d0d1d0 transparent}
.wk-sidebar-top{display:flex;align-items:center;justify-content:space-between;margin:0 0 18px}
.wk-sidebar-top>a{font-size:14px;font-weight:500}
.wk-search-box{margin-bottom:27px}
.wk-search-box .search-label{display:block;margin:0 0 7px;font-size:13px;color:var(--muted,#70747d)}
.wk-search-field{position:relative}
.wk-search-field input{display:block;width:100%;border:1px solid var(--line,#dedfdf);border-radius:0;padding:10px 32px 10px 12px;background:var(--panel,#fff);color:var(--ink,#20242b);font:inherit;font-size:14px;line-height:1.5;min-height:44px}
.wk-search-field input:focus{outline:2px solid var(--accent,#c21f3a);outline-offset:2px}
.wk-search-field kbd{position:absolute;right:9px;top:9px;padding:0 5px;border:1px solid #dfe0df;border-radius:0;font:13px/20px var(--font-mono,Consolas,monospace);color:var(--muted,#62645d);pointer-events:none}
.wk-search-field input:not(:placeholder-shown)+kbd{display:none}
#search-results:not(:empty){margin-top:12px;border-top:1px solid var(--line,#dedfdf);padding-top:10px;max-height:350px;overflow:auto;scrollbar-width:thin}
#search-results .wk-search-count{margin:0 0 8px;color:var(--muted,#70747d);font-size:13px}
#search-results a{display:block;padding:10px 5px;border-bottom:1px solid var(--line,#dedfdf);text-decoration:none;border-radius:0}
#search-results a strong{display:block;font-size:14px;font-weight:500;line-height:1.55}
#search-results a small{display:block;color:var(--muted,#70747d);font-size:13px;line-height:1.7;margin-top:4px}
#search-results>p{font-size:13px;color:var(--muted,#70747d);line-height:1.7}
.wk-nav-group{margin:0 0 24px}
.wk-nav-group h2{display:flex;gap:9px;align-items:center;margin:0 0 7px;font-size:13px;letter-spacing:0;font-weight:500;line-height:1.5;color:#545b64}
.wk-nav-group h2>span{font:13px/1 var(--font-mono,Consolas,monospace);color:#959aa1}
.wk-nav-group a{display:block;position:relative;border-radius:0;padding:8px 12px 8px 25px;font-size:14px;line-height:1.6;color:var(--muted,#62645d);transition:background .15s,color .15s}
.wk-nav-group a:hover{background:#f0f1ed;color:var(--ink,#20242b)}
.wk-nav-group a.current{background:transparent;color:var(--accent,#c21f3a);font-weight:500}
.wk-nav-group a.current::before{content:"";position:absolute;left:0;top:7px;bottom:7px;width:2px;border-radius:0;background:var(--accent,#c21f3a)}
.wk-start-link{display:block;border-top:1px solid var(--line,#dedfdf);padding:15px 3px 3px;font-size:13px;color:var(--accent,#c21f3a)}
.wk-start-link>span{display:block;margin-bottom:4px;color:var(--muted,#70747d);font-size:13px}
.wk-start-link>b{float:right;font-weight:400}
.wk-main{min-width:0;width:100%;outline:none}
.wk-breadcrumbs{display:flex;align-items:center;flex-wrap:wrap;gap:9px;margin:1px 0 20px;font-size:13px;color:var(--muted,#70747d);line-height:1.6}
.wk-breadcrumbs>a:hover{color:var(--accent,#c21f3a)}
.wk-breadcrumbs>[aria-hidden]{color:#b5b8bb}
.wk-article-meta{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:0 0 16px;color:var(--muted,#70747d);font-size:13px;line-height:1.7}
.wk-article-meta>span{display:flex;align-items:center;gap:8px}
.wk-article-meta i{font-style:normal;color:#a9adb2}
.wk-article-meta>a{white-space:nowrap}
.wk-article-meta>a:hover{color:var(--accent,#c21f3a)}
.wiki-article{font-size:16px;line-height:1.95;overflow-wrap:anywhere;min-width:0}
.wiki-article :is(h1,h2,h3,h4){color:var(--ink,#20242b);scroll-margin-top:103px;letter-spacing:-.025em;font-family:var(--font-display,var(--font-text));font-weight:500}
.wiki-article h1{font-size:38px;line-height:1.4;margin:0 0 32px}
.wiki-article h2{font-size:26px;line-height:1.5;margin:48px 0 24px;padding-top:32px;border-top:1px solid var(--line,#dedfdf)}
.wiki-article h3{font-size:20px;line-height:1.6;margin:32px 0 16px}
.wiki-article h4{font-size:17px;line-height:1.6;margin:24px 0 12px}
.wiki-article p,.wiki-article ul,.wiki-article ol{margin:15px 0}
.wiki-article li{margin:6px 0}
.wiki-article ul,.wiki-article ol{padding-left:1.5em}
.wiki-article li::marker{color:#9299a0}
.wiki-article strong{font-weight:500}
.wiki-article a{color:var(--accent,#c21f3a);text-decoration:underline;text-decoration-color:#dbaeb7;text-underline-offset:4px}
.wiki-article a:hover{text-decoration-color:var(--accent,#c21f3a)}
.wiki-article code{background:#ebece9;border-radius:0;padding:2px 5px;font: .88em/1.6 var(--font-mono,SFMono-Regular,Consolas,monospace);color:#4c3942}
.wiki-article pre{background:#222427;color:#e8eaed;border:1px solid #323841;border-radius:0;padding:20px;overflow:auto;font:13px/1.8 var(--font-mono,SFMono-Regular,Consolas,monospace);margin:21px 0;scrollbar-width:thin}
.wiki-article pre code{background:none;border:0;padding:0;color:inherit;font:inherit;white-space:pre;overflow-wrap:normal}
.wiki-article blockquote{border-left:2px solid var(--accent,#c21f3a);background:#f1f1ed;border-radius:0;margin:23px 0;padding:8px 18px;color:#5d4d52;font-size:15px;line-height:1.9}
.wiki-article blockquote>p{margin:7px 0}
.wiki-article table{display:block;max-width:100%;overflow:auto;border-collapse:collapse;margin:24px 0;font-size:14px;line-height:1.75;scrollbar-width:thin}
.wiki-article th,.wiki-article td{border:0;border-bottom:1px solid var(--line,#dedfdf);padding:11px 13px;min-width:70px}
.wiki-article th{background:#eeefeb;border-top:1px solid var(--line,#dedfdf);text-align:left;font-weight:500}
.wiki-article td{background:transparent}
.wiki-article img{display:block;max-width:100%;max-height:660px;height:auto;object-fit:contain;margin:22px auto;background:#fff}
.wiki-article .figure-zoom{width:100%;margin:22px 0;background:#fff}
.wiki-article .figure-zoom img{margin:0 auto}
.wiki-article .figure-zoom-label{font-size:13px}
.wiki-article hr{border:0;border-top:1px solid var(--line,#dedfdf);margin:32px 0}
.wiki-article .toc{border-block:1px solid var(--line,#dedfdf);border-radius:0;background:transparent;padding:12px 18px;font-size:13px}
.wiki-article .toc ul{margin:6px 0}
.wiki-article video.lesson-video{display:block;width:100%;height:auto;aspect-ratio:16/9;border:1px solid var(--line,#dedfdf);border-radius:0;background:#171a20;margin:24px 0}
.wiki-article .prototype-grid{margin:24px 0}
.wk-pagination{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:48px 0 0;padding-top:27px;border-top:1px solid var(--line,#dedfdf)}
.wk-pagination>a{display:flex;flex-direction:column;min-width:0;background:transparent;border-bottom:1px solid var(--line,#dedfdf);padding:17px 0;text-decoration:none;transition:border-color .15s}
.wk-pagination>a:hover{border-color:#bd6a7a}
.wk-pagination>a[rel=next]:first-child{grid-column:2}
.wk-page-direction{display:flex;align-items:center;justify-content:space-between;gap:10px;color:var(--muted,#70747d);font-size:13px;margin-bottom:9px}
.wk-page-direction i{font-style:normal;color:var(--accent,#c21f3a);font-size:15px;line-height:1}
.wk-pagination strong{font-size:17px;line-height:1.6;font-weight:500}
.wk-pagination small{color:var(--muted,#70747d);font-size:14px;line-height:1.7;margin-top:6px}
.wk-article-footer{display:flex;justify-content:space-between;gap:20px;padding-top:23px;margin-top:20px;color:var(--muted,#62645d);font-size:13px;line-height:1.6}
.wk-article-footer>a:hover{color:var(--accent,#c21f3a)}
.wk-toc{position:sticky;top:112px;min-width:0;max-height:calc(100dvh - 140px);overflow:auto;padding:0 1px 15px 0;scrollbar-width:thin}
.wk-toc>p{margin:0 0 14px;font-size:13px;color:#515963;font-weight:500}
.wk-toc ol,.wk-page-contents ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line,#dedfdf)}
.wk-toc li,.wk-page-contents li{margin:0}
.wk-toc a[data-wiki-toc-link],.wk-page-contents a[data-wiki-toc-link]{display:block;position:relative;padding:6px 4px 6px 13px;font-size:13px;line-height:1.7;color:var(--muted,#62645d);text-decoration:none}
.wk-toc .wk-toc-level-3>a,.wk-page-contents .wk-toc-level-3>a{padding-left:24px;font-size:13px}
.wk-toc a[data-wiki-toc-link]:hover,.wk-page-contents a[data-wiki-toc-link]:hover{color:var(--ink,#20242b)}
.wk-toc a[aria-current=location],.wk-page-contents a[aria-current=location]{color:var(--accent,#c21f3a);font-weight:500}
.wk-toc a[aria-current=location]::before,.wk-page-contents a[aria-current=location]::before{content:"";position:absolute;left:-1px;top:6px;bottom:6px;width:2px;background:var(--accent,#c21f3a)}
.wk-toc-top{display:block;margin-top:20px;padding:14px 0 0;border-top:1px solid var(--line,#dedfdf);font-size:13px;color:var(--muted,#70747d)}
.wk-toc-empty{font-size:13px;color:var(--muted,#70747d)}
.wk-page-contents{display:none}
.wk-nav-backdrop[hidden]{display:none}
.wk-nav-backdrop{position:fixed;inset:0;z-index:70;border:0;border-radius:0;background:rgba(20,24,30,.46);padding:0;cursor:default}
.wk-noscript-nav{display:flex;gap:22px;padding:14px 25px;justify-content:center;font-size:13px;border-bottom:1px solid var(--line,#dedfdf)}
.wk-main:target{scroll-margin-top:100px}
@media(max-width:1320px){.wk-layout{padding-inline:28px;grid-template-columns:200px minmax(0,1fr) 168px;gap:28px}.wk-header-inner{padding-inline:28px}.wiki-article{font-size:16px}}
@media(max-width:1180px){.wk-layout{grid-template-columns:210px minmax(0,760px);justify-content:center;gap:34px}.wk-toc{display:none}.wk-page-contents{display:block;border-block:1px solid var(--line,#dedfdf);border-radius:0;margin:0 0 22px;background:transparent}.wk-page-contents>summary{padding:11px 15px;cursor:pointer;font-size:13px;color:#545d67}.wk-page-contents>summary>span{float:right;color:var(--muted,#62645d);font-size:13px;line-height:22px}.wk-page-contents>nav{padding:4px 15px 13px}.wk-page-contents[open]>summary{border-bottom:1px solid var(--line,#dedfdf)}.wk-page-contents ol{margin-top:9px}.wk-page-contents a[data-wiki-toc-link]{font-size:13px;padding-block:6px}.wk-page-contents .wk-toc-level-3>a{font-size:13px}}
@media(max-width:1020px){.wk-header-inner{height:68px;padding-inline:24px}.wk-layout{display:block;max-width:820px;padding:32px 32px 64px}.wk-main{margin:auto}.wiki-mobile-menu{display:inline-block;border:1px solid var(--line,#dedfdf);border-radius:0;padding:7px 11px;background:var(--panel,#fff);color:var(--accent,#c21f3a);font:inherit;font-size:13px}.wk-header nav{gap:22px}.wk-sidebar{position:fixed;z-index:80;left:0;top:0;bottom:0;width:min(340px,88vw);max-height:none;padding:23px 22px;background:var(--paper,#f7f7f4);transform:translateX(-102%);visibility:hidden;transition:transform .2s ease,visibility .2s;overflow:auto;overscroll-behavior:contain;border-right:1px solid var(--line,#dedfdf)}.wiki-nav-open .wk-sidebar{transform:translateX(0);visibility:visible}.wk-sidebar-top{margin-bottom:22px}.wk-sidebar-top>a{font-size:15px}.wk-nav-close{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line,#dedfdf);border-radius:0;background:var(--panel,#fff);padding:6px 10px;color:var(--muted,#70747d);font:inherit;font-size:13px}.wk-nav-close span{font-size:17px;line-height:1}.wk-search-field input{font-size:16px;min-height:43px}.wk-search-field kbd{top:12px}.wk-search-box{margin-bottom:25px}.wk-nav-group h2{font-size:13px}.wk-nav-group a{font-size:13px;padding-block:8px}.wk-nav-group a.current::before{top:13px}.wk-start-link{font-size:13px}.wiki-article :is(h1,h2,h3,h4){scroll-margin-top:90px}.wk-main:target{scroll-margin-top:90px}.wk-article-meta{margin-bottom:15px}.wiki-article{font-size:16px}.wiki-article h1{font-size:30px}}
@media(max-width:600px){.wk-header-inner{height:72px;padding-inline:24px;gap:12px}.wk-header .brand{font-size:14px;gap:10px}.wk-header .brand-mark{width:49px;height:25px}.wk-header .brand small{font-size:12px;letter-spacing:0}.wk-header nav{gap:12px;font-size:13px}.wk-header-wiki,.wk-header nav>a:first-child{display:none}.wiki-mobile-menu{min-height:44px;padding:8px 12px;font-size:13px}.wk-layout{padding:24px 24px 48px}.wk-breadcrumbs{font-size:13px;margin-bottom:18px;gap:7px}.wk-article-meta{font-size:13px;gap:8px;align-items:flex-start}.wk-article-meta>span{gap:6px;flex-wrap:wrap}.wk-article-meta>a{font-size:13px}.wk-page-contents{margin-bottom:21px}.wk-page-contents>summary{font-size:13px;padding:10px 12px}.wk-page-contents>summary>span{font-size:13px;line-height:20px}.wiki-article{font-size:16px;line-height:1.95}.wiki-article h1{font-size:30px;margin-bottom:24px;letter-spacing:-.035em}.wiki-article h2{font-size:23px;margin:40px 0 20px;padding-top:24px}.wiki-article h3{font-size:19px;margin-top:28px}.wiki-article p,.wiki-article ul,.wiki-article ol{margin:14px 0}.wiki-article pre{font-size:13px;padding:15px;margin:18px 0}.wiki-article blockquote{padding:8px 16px;font-size:15px}.wiki-article table{font-size:14px}.wiki-article th,.wiki-article td{padding:8px 10px}.wk-pagination{gap:11px;padding-top:22px;margin-top:35px}.wk-pagination>a{padding:13px 12px}.wk-pagination strong{font-size:16px}.wk-pagination small{font-size:13px}.wk-page-direction{font-size:13px;margin-bottom:7px}.wk-article-footer{font-size:13px;gap:12px}.wk-search-field input{font-size:16px}}
@media(prefers-reduced-motion:reduce){.wk-sidebar,.wk-nav-group a,.wk-pagination>a{transition:none}}

/* Reading rails stay quiet; the current lesson carries the brand accent. */
.wk-article-footer { flex-wrap: wrap; }
.wk-article-footer .wk-filing { flex-basis: 100%; color: var(--muted); font-size: 12px; }
.wk-nav-group h2 { padding-top: 12px; border-top: 1px solid var(--line, #d7d9d6); }
.wk-nav-group h2 > span { color: #767d83; }
.wk-search-field input { background: var(--panel, #fff); }
.wk-breadcrumbs { padding-bottom: 15px; border-bottom: 1px solid var(--line, #d7d9d6); }
.wiki-article h1 { letter-spacing: -.035em; }
.wk-pagination > a:hover { color: var(--accent, #c21f3a); }
.wk-page-contents > summary { list-style-position: outside; }
.wiki-article .hall-teaching .ht-figure { border-radius: 0; }
.wiki-article .hall-teaching .ht-controls button { border-radius: 0; }
@media (min-width: 1021px) {
  .wk-sidebar { border-right: 1px solid var(--line, #d7d9d6); padding-right: 20px; }
}

@media (max-width: 359px) {
  .wk-header-inner { padding-inline: 20px; }
  .wk-layout { padding-inline: 20px; }
  .wk-header .brand small { font-size: 11px; }
  .wiki-mobile-menu { padding-inline: 10px; }
}