.site-app{--sidebar-width:252px;min-height:100vh;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Helvetica Neue,Arial,sans-serif}.site-app[data-sidebar-collapsed=true]{--sidebar-width:74px}.site-drawer-backdrop,.site-sidebar button,.site-topbar button{font:inherit;cursor:pointer}.site-app a,.site-app button{-webkit-tap-highlight-color:transparent}.site-app :is(a,button):focus-visible{outline:2px solid var(--focus);outline-offset:3px}.site-skip-link{position:fixed;left:16px;top:12px;z-index:100;transform:translateY(-160%);border-radius:var(--radius-control);padding:9px 15px;background:var(--title);color:var(--bg);font-size:13px}.site-skip-link:focus{transform:none}.site-sidebar{position:fixed;inset:0 auto 0 0;z-index:40;width:var(--sidebar-width);padding:24px 12px 17px;background:var(--sidebar);box-shadow:1px 0 0 var(--line);display:flex;flex-direction:column;min-height:0;transition:none}.site-sidebar-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;flex:none;padding:2px 12px 28px;min-width:0}.site-brand{display:inline-flex;align-items:center;gap:11px;min-width:0;width:max-content;color:var(--title)}.site-brand-mark{width:28px;height:28px;border:2px solid;border-radius:50%;display:grid;place-items:center;transform:rotate(-22deg);flex:none}.site-brand-mark>span{width:12px;height:12px;border:2px solid;border-right:2px solid transparent;border-radius:50%}.site-brand-name{font-size:21px;font-weight:600;letter-spacing:-.6px;white-space:nowrap}.site-sidebar-scroll{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;scrollbar-width:thin;scrollbar-color:var(--line) transparent;overscroll-behavior:contain}.site-primary-nav{display:grid;gap:6px}.site-nav-link{display:flex;align-items:center;gap:11px;min-height:44px;padding:9px 12px;border-radius:var(--radius-control);font-size:14px;line-height:1.6;color:var(--muted);white-space:nowrap}.site-nav-link svg{flex:none}.site-course-groups{margin-top:27px;min-width:0}.site-course-label{margin:0 12px 9px;font-size:11px;line-height:1.8;color:var(--quiet)}.site-course-group+.site-course-group{margin-top:9px}.site-course-heading{display:flex;align-items:center;gap:4px;min-width:0;padding-left:12px}.site-course-heading>a{min-width:0;flex:1;display:flex;align-items:center;gap:8px;min-height:38px;color:var(--muted);font-size:13px;line-height:1.6}.site-course-heading>a>span{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.site-course-heading>a>small{flex:none;font-size:10px;color:var(--quiet);white-space:nowrap;margin-left:auto}.site-course-heading>a:hover,.site-course-heading[data-active=true]>a{color:var(--title)}.site-course-heading>button[aria-expanded=false] svg{transform:rotate(-90deg)}.site-chapter-list{display:grid;gap:3px;padding-top:5px}.site-chapter-list[hidden]{display:none}.site-chapter-link{display:flex;align-items:flex-start;gap:8px;padding:8px 11px;min-width:0;border-radius:var(--radius-control);color:var(--muted);font-size:12px;line-height:1.65}.site-chapter-link>span:last-child{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.site-chapter-number{width:18px;flex:none;font-size:10px;color:var(--quiet);line-height:20px;font-variant-numeric:tabular-nums}.site-chapter-link[aria-current=page] .site-chapter-number{color:var(--muted)}.site-sidebar-note{display:flex;align-items:center;gap:7px;flex:none;font-size:11px;color:var(--quiet);line-height:1.8;padding:20px 12px 0;margin:0;white-space:nowrap}.site-sidebar-dot{width:4px;height:4px;border-radius:50%;background:var(--muted);flex:none}.site-workspace{margin-left:var(--sidebar-width);min-width:0;min-height:100vh;background:var(--bg);transition:none}.site-topbar{position:sticky;top:0;z-index:25;height:64px;gap:18px;padding:0 36px;background:var(--bg)}.site-topbar,.site-topbar-context{min-width:0;display:flex;align-items:center}.site-topbar-context{gap:10px;flex:1;color:var(--muted);font-size:12px;line-height:1.6;white-space:nowrap;overflow:hidden}.site-topbar-context>a,.site-topbar-context>span{min-width:0;overflow:hidden;text-overflow:ellipsis}.site-topbar-context>a:hover{color:var(--title)}.site-topbar-context>.site-crumb-slash{flex:none;color:var(--quiet)}.site-crumb-current{color:var(--quiet)}.site-appearance>button{transition:background .18s ease,color .18s ease,box-shadow .18s ease}.site-topbar-actions{display:flex;align-items:center;gap:14px;flex:none}.site-reading-directory{display:none;padding:0 12px}.site-reading-directory+.site-course-groups{margin-top:25px}.site-appearance{display:inline-flex;align-items:center;gap:2px;padding:4px;background:var(--surface);border-radius:var(--radius-control);box-shadow:var(--shadow-sm);flex:none}.site-appearance>button{border:0;background:none;border-radius:var(--radius-small);padding:6px 11px;color:var(--muted);font-size:11px;line-height:1.5;white-space:nowrap}.site-appearance>button:hover{color:var(--title);background:var(--surface-hover)}html[data-theme=dark] .site-appearance>[data-theme-mode=dark],html[data-theme=light] .site-appearance>[data-theme-mode=light]{background:var(--selected);color:var(--title);font-weight:600;box-shadow:var(--shadow-sm)}.site-content{min-width:0;outline:none}.site-shell-footer{max-width:1080px;padding:27px 42px 29px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--quiet);font-size:11px;line-height:1.8;background:var(--bg)}.site-shell-footer>a:hover{color:var(--text)}.site-drawer-backdrop,.site-menu-button,.site-sidebar .site-drawer-close{display:none}.site-app[data-sidebar-collapsed=true] .site-sidebar{padding-inline:10px}.site-app[data-sidebar-collapsed=true] .site-sidebar-heading{padding:2px 0 22px;justify-content:center;flex-direction:column;gap:18px}.site-app[data-sidebar-collapsed=true] .site-brand-name,.site-app[data-sidebar-collapsed=true] .site-course-groups,.site-app[data-sidebar-collapsed=true] .site-nav-link>span,.site-app[data-sidebar-collapsed=true] .site-sidebar-note>span:last-child{display:none}.site-app[data-sidebar-collapsed=true] .site-nav-link{justify-content:center;padding:11px 0;min-height:43px}.site-app[data-sidebar-collapsed=true] .site-primary-nav{gap:7px}.site-app[data-sidebar-collapsed=true] .site-sidebar-note{justify-content:center;padding-inline:0}.site-app[data-sidebar-collapsed=true] .site-reading-directory{display:none}@media(max-width:1050px){.site-topbar{padding-inline:27px;gap:12px}.site-topbar-actions{gap:7px}.site-shell-footer{padding-inline:30px}}@media(max-width:800px){.site-app,.site-app[data-sidebar-collapsed=true]{--sidebar-width:0px}.site-sidebar{width:min(292px,calc(100vw - 46px));padding:22px 13px 18px;z-index:70;transform:translateX(-100%);visibility:hidden;pointer-events:none;transition:transform .18s ease,visibility .18s ease}.site-app[data-drawer-open=true] .site-sidebar{transform:translateX(0);visibility:visible;pointer-events:auto}.site-sidebar-heading{padding:2px 11px 25px}.site-sidebar .site-sidebar-toggle{display:none}.site-reading-directory{display:block;margin-top:24px}.site-sidebar .site-drawer-close{display:inline-grid}.site-drawer-backdrop{display:block;position:fixed;inset:0;z-index:60;background:rgb(0 0 0/.55);border:0;width:100%;height:100%;padding:0;cursor:default!important}.site-topbar{height:59px;padding:0 17px;gap:12px}.site-menu-button{display:flex;align-items:center;gap:6px;padding:7px 3px;border:0;border-radius:var(--radius-small);background:none;color:var(--muted)!important;font-size:11px!important;line-height:1.5;flex:none}.site-menu-button:hover{background:var(--surface-hover)}.site-topbar-context{font-size:11px;gap:6px}.site-crumb-current,.site-topbar-context>.site-crumb-slash{display:none}.site-appearance{padding:3px;gap:1px;border-radius:var(--radius-control)}.site-appearance>button{font-size:11px;padding:6px 9px}.site-shell-footer{padding:24px 23px 28px;font-size:10px;gap:8px;flex-wrap:wrap}}@media(prefers-reduced-motion:reduce){.site-sidebar,.site-workspace{transition:none}}@media (forced-colors:active){.site-appearance>button[aria-pressed=true],.site-chapter-link[aria-current=page],.site-nav-link[aria-current=page]{outline:1px solid Highlight;outline-offset:-2px}}