/* Read surface v2. One category bar; one continuous document; exact chapter navigation. */
.plane-shell.plane-refresh .plane-page.page:has(.kb-reader){padding:0!important;overflow:hidden!important}
.phase1-root:has(>.kb-reader){min-width:0;max-width:none;width:100%;margin:0}
.phase1-root:has(>.kb-reader)>.p1-progress{display:none}
.plane-shell.plane-refresh .kb-workspace.kb-reader{
 --kr-paper:#fff;--kr-ink:#202632;--kr-muted:#626d7d;--kr-line:#e6e8ed;--kr-soft:#f5f6f7;
 --kr-blue:#006399;--kr-blue-hover:#005580;--kr-selection:#e4f3f5;--kr-note:#f6eddf;--kr-note-ink:#916239;--kr-note-edge:#dfceb8;
 display:flex;flex-direction:column;width:100%;min-height:0;overflow:hidden;background:var(--kr-paper);color:var(--kr-ink);
 font:400 16px/1.85 var(--font-ui,"Microsoft YaHei UI","Microsoft YaHei","PingFang SC",sans-serif);
}
.kb-reader .kr-tabbar{display:flex;align-items:center;flex:none;min-width:0;min-height:56px;padding:8px 24px;border-bottom:1px solid var(--kr-line);background:var(--kr-paper)}
.plane-shell.plane-refresh .kb-reader .kr-tabs:not(:has(.cs-seg-thumb))>[aria-selected=true]{background:var(--ui-tab-paper,#fff)!important;box-shadow:0 1px 3px #1823340d!important}
.kb-reader .kr-tabbar button{position:relative;display:block;flex:none;padding:7px 14px;min-height:36px;border:0;border-radius:6px;background:transparent;color:var(--kr-muted);font-family:inherit;font-size:14px;font-weight:500;line-height:22px;white-space:nowrap;cursor:pointer}
.kb-reader .kr-tabbar button:hover{background:var(--kr-soft);color:var(--kr-ink)}
.kb-reader .kr-tabbar button[aria-selected=true]{background:var(--kr-selection);color:var(--kr-blue)}
.kb-reader .kr-layout{display:grid;grid-template-columns:minmax(0,1fr) 228px;flex:1;min-height:0;overflow:hidden}
.kb-reader .kr-scroll{min-height:0;min-width:0;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:var(--kr-line) transparent;outline:none}
.kb-reader .kr-document{width:100%;max-width:1140px;margin:0;padding:28px 24px 72px;min-width:0;text-align:left}
.kb-reader .kr-section{padding:0;margin:0 0 48px;min-width:0;scroll-margin-top:24px}
.kb-reader .kr-section:last-child{min-height:calc(var(--kr-viewport,70vh) - 48px)}
.plane-shell.plane-refresh .kb-reader .kr-section>h2{display:block;font-size:24px!important;line-height:1.5!important;font-weight:600!important;color:var(--kr-ink)!important;margin:0 0 20px!important;padding:0!important;border:0!important;background:none!important}
.kb-reader .kr-record{margin:28px 0 0;padding:0;border:0;background:none;min-width:0;scroll-margin-top:24px}
.plane-shell.plane-refresh .kb-reader .kr-record>h3{display:block;margin:0 0 12px!important;padding:0!important;font-size:18px!important;line-height:1.65;font-weight:600;color:var(--kr-ink)!important;background:none!important;border:0!important;overflow-wrap:anywhere}
.plane-shell.plane-refresh .kb-reader :is(p,li,.kr-prose){font-size:16px!important;line-height:1.85!important;color:var(--kr-ink);max-width:none;overflow-wrap:anywhere}
.plane-shell.plane-refresh .kb-reader p{margin:0 0 16px!important}
.kb-reader .kr-lead{margin-bottom:24px!important}
.plane-shell.plane-refresh .kb-reader .kr-prose,.plane-shell.plane-refresh .kb-reader .kr-section>p{max-width:960px}
.kb-reader .kr-prose :is(h2,h3,h4){font-size:18px!important;font-weight:600;margin:28px 0 12px!important;line-height:1.6;color:var(--kr-ink)!important}
.kb-reader :is(strong,b){font-weight:600}
.kb-reader .kr-prose :is(ul,ol){padding-left:24px;margin:12px 0 20px}
.kb-reader .kr-prose li{margin:8px 0}
.kb-reader li::marker{color:var(--kr-muted)}
.kb-reader .kr-prose blockquote{margin:20px 0;padding:0 0 0 16px;border:0;border-left:1px solid var(--kr-line);background:none;color:var(--kr-muted);font-size:15px}
.kb-reader .kr-prose pre{padding:16px;background:var(--kr-soft);border-radius:8px;overflow:auto;font-size:13px;line-height:1.8;white-space:pre-wrap}
.kb-reader .kr-prose code{font-size:13px;background:var(--kr-soft);padding:2px 4px;border-radius:3px}
.kb-reader a{color:var(--kr-blue);text-underline-offset:3px}
.kb-reader a:hover{color:var(--kr-blue-hover);text-decoration:underline}
.kb-reader sup{vertical-align:super;font-size:11px;line-height:0;white-space:nowrap;margin-left:3px}
.kb-reader .kr-reference{font-size:11px;text-decoration:none;padding:2px}
.kb-reader .kr-table-scroll{margin:20px 0 28px;max-width:100%;overflow-x:auto;border:1px solid var(--kr-line);border-radius:8px}
.kb-reader .kr-table-scroll table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:14px;line-height:1.8}
.plane-shell.plane-refresh .kb-reader .kr-table-scroll :is(th,td){padding:12px 16px!important;border:0;border-right:1px solid var(--kr-line);border-bottom:1px solid var(--kr-line);text-align:left;vertical-align:top;overflow-wrap:anywhere;background:var(--kr-paper)!important;color:var(--kr-ink)!important;font-size:14px!important;font-weight:400}
.plane-shell.plane-refresh .kb-reader .kr-table-scroll thead th{background:var(--kr-soft)!important;color:var(--kr-muted)!important;font-size:13px!important;font-weight:600}
.kb-reader .kr-table-scroll :is(th,td):last-child{border-right:0!important}
.kb-reader .kr-table-scroll tbody tr:last-child>*{border-bottom:0!important}
.kb-reader .kr-table-scroll thead th:first-child{width:27%}
.plane-shell.plane-refresh .kb-reader .kr-table-scroll .kr-prose,.plane-shell.plane-refresh .kb-reader .kr-table-scroll .kr-prose p{display:inline;font-size:15px!important;line-height:1.8!important;margin:0!important}
.kb-reader .kr-table-scroll td .kr-prose{display:inline}
.plane-shell.plane-refresh .kb-reader .kr-note{padding:14px 18px!important;margin:20px 0 24px!important;border:1px solid var(--kr-note-edge);border-radius:8px;background:var(--kr-note);color:var(--kr-note-ink)!important;font-size:14px!important;line-height:1.85!important}
.plane-shell.plane-refresh .kb-reader .kr-note p{color:var(--kr-note-ink)!important;font-size:14px!important;margin:4px 0 0!important}
.kb-reader .kr-note>strong{display:block;font-size:15px;color:inherit}
.plane-shell.plane-refresh .kb-reader .kr-empty-copy{color:var(--kr-muted)!important;font-size:15px!important;line-height:1.85;margin:0 0 20px!important}
.kb-reader .kr-answer{padding-bottom:24px;border-bottom:1px solid var(--kr-line)}
.plane-shell.plane-refresh .kb-reader .kr-answer-source,.plane-shell.plane-refresh .kb-reader .kr-source-meta{font-size:12px!important;line-height:1.8!important;color:var(--kr-muted)!important;margin:12px 0 20px!important}
.kb-reader .kr-source-meta a{overflow-wrap:anywhere}
.kb-reader .kr-source-article+.kr-source-article{padding-top:28px;border-top:1px solid var(--kr-line)}
.kb-reader .kr-source-index{padding:12px 0;border-bottom:1px solid var(--kr-line);scroll-margin-top:24px}
.kb-reader .kr-source-index>span{display:block;font-size:12px;color:var(--kr-muted)}
.kb-reader .kr-term{display:inline-block;margin:0 12px 8px 0;font-weight:600}
.kb-reader .kr-reading-figure,.kb-reader .kb-reading-figure{margin:24px 0;max-width:100%}
.kb-reader .kb-reading-figure img{display:block;max-width:100%;height:auto;border-radius:8px}
.kb-reader .kb-reading-figure figcaption{font-size:12px;line-height:1.8;margin-top:8px;color:var(--kr-muted)}
.kb-reader .kr-toc{min-width:0;min-height:0;overflow:auto;padding:32px 20px 40px 24px;border-left:1px solid var(--kr-line);background:var(--kr-paper);scrollbar-width:thin}
.plane-shell.plane-refresh .kb-reader .kr-toc-title{font-size:12px!important;line-height:20px!important;color:var(--kr-muted)!important;font-weight:500;margin:0 0 16px!important}
.kb-reader .kr-toc nav{display:flex;flex-direction:column;gap:2px}
.kb-reader .kr-toc-link{display:block;border-left:1px solid transparent;padding:5px 0 5px 12px;margin-left:-1px;text-decoration:none;color:var(--kr-muted);font-size:13px;line-height:1.65;overflow-wrap:anywhere}
.kb-reader .kr-toc-link.kr-level-2{padding-left:24px;font-size:12px}
.kb-reader .kr-toc-link:hover{color:var(--kr-ink);text-decoration:none}
.kb-reader .kr-toc-link[aria-current=location]{color:var(--kr-blue);border-left-color:var(--kr-blue);font-weight:500}
.kb-reader :is(a,button,[tabindex]):focus-visible{outline:2px solid var(--kr-blue);outline-offset:3px}
html.dark .plane-shell.plane-refresh .kb-workspace.kb-reader{--kr-paper:#20252c;--kr-ink:#e4e6e6;--kr-muted:#aeb7c3;--kr-line:#343b45;--kr-soft:#292f38;--kr-blue:#8bc5e7;--kr-blue-hover:#a3d5f1;--kr-selection:#263f49;--kr-note:#342c24;--kr-note-edge:#65513d;--kr-note-ink:#e4c6a6}
@media(max-width:1100px){.kb-reader .kr-layout{grid-template-columns:minmax(0,1fr) 196px}.kb-reader .kr-toc{padding:28px 14px 32px 18px}}
@media(max-width:800px){
 .kb-reader .kr-tabbar{padding:8px 16px;gap:2px;min-height:52px}
 .kb-reader .kr-tabbar button{padding:6px 12px;font-size:13px}
 .kb-reader .kr-layout{display:flex;flex-direction:column}
 .kb-reader .kr-toc{order:-1;flex:none;max-height:112px;padding:10px 16px;border-left:0;border-bottom:1px solid var(--kr-line)}
 .plane-shell.plane-refresh .kb-reader .kr-toc-title{display:none}
 .kb-reader .kr-toc nav{flex-direction:row;flex-wrap:wrap;gap:4px 12px}
 .kb-reader .kr-toc-link{padding:3px 0;font-size:12px;border:0}
 .kb-reader .kr-toc-link.kr-level-2{display:none}
 .kb-reader .kr-scroll{flex:1}
 .kb-reader .kr-document{padding:24px 16px 56px}
 .plane-shell.plane-refresh .kb-reader .kr-section>h2{font-size:22px!important}
 .kb-reader .kr-table-scroll table{min-width:420px}
 .kb-reader .kr-table-scroll{scrollbar-width:thin}
 .kb-reader .kr-section{margin-bottom:36px}
}
@media(prefers-reduced-motion:reduce){.kb-reader *{scroll-behavior:auto!important}}

/* Restore the original grouped material directory while retaining chapter anchors. */
.kb-reader .kr-directory{padding:28px 16px 32px;background:#fafbfd;border-left:1px solid var(--kr-line)}
.plane-shell.plane-refresh .kb-reader .kr-directory .kr-toc-title{color:var(--kr-ink)!important;font-size:13px!important;font-weight:500;margin:0 8px 20px!important}
.kb-reader .kr-nav-group{margin:0 0 14px}
.kb-reader .kr-nav-group>summary{display:flex;align-items:center;gap:10px;list-style:none;padding:8px;min-height:42px;cursor:pointer;color:var(--kr-ink);font-size:13px}
.kb-reader .kr-nav-group>summary::-webkit-details-marker{display:none}
.kb-reader .kr-nav-icon{display:grid;place-items:center;flex:none;width:22px;height:22px}
.kb-reader .kr-nav-icon svg{width:20px;height:20px}
.kb-reader .kr-nav-chevron{margin-left:auto;display:flex}
.kb-reader .kr-nav-chevron svg{width:14px;height:14px}
.kb-reader .kr-nav-group[open] .kr-nav-chevron{transform:rotate(90deg)}
.kb-reader .kr-nav-group nav{border-left:1px solid var(--kr-line);margin:8px 0 0 9px;padding-left:7px;gap:2px}
.kb-reader .kr-directory .kr-toc-link{display:flex;align-items:center;min-height:36px;border:0;border-radius:5px;padding:8px 10px;margin:0;font-size:12px;color:var(--kr-muted);line-height:1.6}
.kb-reader .kr-directory .kr-toc-link.kr-level-2{padding:5px 10px 5px 20px;min-height:30px}
.kb-reader .kr-directory .kr-toc-link[aria-current=location]{color:var(--kr-blue);background:var(--kr-selection)}
.kb-reader .kr-directory .kr-toc-link:hover{background:var(--kr-soft)}
.kb-reader .kr-nav-note{margin:24px 8px 0;padding-top:18px;border-top:1px solid var(--kr-line);font-size:12px;line-height:1.9;color:var(--kr-muted)}
html.dark .kb-reader .kr-directory{background:var(--kr-paper)}
@media(max-width:800px){
 .kb-reader .kr-directory{padding:8px 16px;max-height:140px}
 .kb-reader .kr-nav-group{margin:0}
 .kb-reader .kr-nav-group:not([open]){display:none}
 .kb-reader .kr-nav-group>summary,.kb-reader .kr-nav-note{display:none}
 .kb-reader .kr-nav-group nav{margin:0;padding:0;border:0;flex-direction:row;flex-wrap:wrap}
 .kb-reader .kr-directory .kr-toc-link{padding:5px 8px;min-height:32px}
 .kb-reader .kr-directory .kr-toc-link.kr-level-2{display:none}
}