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button[aria-pressed=true],.app-badge{background:var(--ink-fg);color:var(--ink)}}.app-count:empty{display:none}.app-count{opacity:.75;font-size:.72rem}.app-rows{margin:0;padding:0;list-style:none}.app-row{border-bottom:1px solid var(--list-line);position:relative}.app-row-main,.app-event{color:var(--fg);border-radius:6px;align-items:flex-start;gap:10px;padding:9px 36px 9px 6px;text-decoration:none;display:flex}.app-row-main:hover{background:color-mix(in srgb, var(--sand) 45%, transparent)}.app-row-main[aria-current=page]{background:var(--sand)}.app-row .app-row-main[aria-current=page] :is(.app-num,.app-row-title,.app-row-when){color:var(--fg)}.app-row-main[aria-current=page]+.app-star{display:none}.app-num{text-align:right;width:24px;font:600 .95rem/1.35 var(--f-serif);color:var(--muted);font-variant-numeric:tabular-nums;flex:none}.app-row-body{gap:1px;min-width:0;display:grid}.app-row-title{font:600 .95rem/1.3 var(--f-serif)}.app-row-when{color:var(--muted);align-items:center;gap:6px;font-size:.78rem;display:flex}.app-badge.app-badge-open{color:var(--fg);box-shadow:inset 0 0 0 1px var(--field);background:0 0}.app-badge{letter-spacing:.04em;text-transform:uppercase;background:var(--ink);color:var(--ink-fg);border-radius:999px;padding:0 6px;font-size:.75rem;font-weight:600}.app-row.past .app-row-title{color:color-mix(in srgb, var(--fg) 75%, var(--list-bg));font-weight:400}.app-row.app-event .app-row-title{font:700 .8rem/1.4 var(--f-sans);letter-spacing:.06em;text-transform:uppercase;color:var(--event)}.app-event .app-num{color:var(--event)}.app-row.app-apart-above{border-bottom-width:2px;margin-bottom:12px}.app-row.app-apart-below{border-top:2px solid var(--list-line);margin-top:12px}.app-hits{flex-wrap:wrap;gap:2px 10px;padding:0 6px 0 40px;display:flex}.app-hits:has(.app-hit:not([hidden])){padding-bottom:8px}.app-hit{color:var(--fg);font-size:.8rem;text-decoration:none}.app-hit,.app-more{box-sizing:border-box;min-height:24px;padding-block:2px}.app-hit:hover{color:var(--accent);text-underline-offset:.15em;text-decoration:underline}.app-list mark{background:color-mix(in srgb, var(--accent) 20%, transparent);color:inherit;border-radius:2px;padding:0 1px}.app-hit b{letter-spacing:.06em;text-transform:uppercase;color:color-mix(in srgb, var(--ns-blue) 80%, var(--fg));font-size:.75rem}.app-hit-ex{-webkit-line-clamp:2;-webkit-box-orient:vertical;flex-basis:100%;display:-webkit-box;overflow:hidden}.app-more{font:500 .78rem var(--f-sans);color:var(--muted);text-align:left;cursor:pointer;background:0 0;border:0;flex-basis:100%;justify-self:start;padding-inline:0}.app-more:hover{color:var(--accent)}.app-empty{color:var(--muted);padding:16px 6px;font-size:.9rem}.sr-only{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;margin:-1px;position:absolute;overflow:hidden}.app-star{width:30px;height:30px;color:var(--muted);cursor:pointer;opacity:.55;background:0 0;border:0;border-radius:8px;place-items:center;display:grid;position:absolute;top:6px;right:2px}.app-star svg{width:17px;height:17px}.app-row:hover .app-star,.app-star:focus-visible{opacity:1}.app-star[aria-pressed=true]{color:#d99a00;opacity:1}.app-star[aria-pressed=true] svg{fill:currentColor}.app .lesson-page{max-width:38rem;margin-inline:auto}.app-lesson-head{margin:36px 0 28px}.app-lesson-head .page-title{margin:6px 0 0;font-size:clamp(1.9rem,3.4vw,2.5rem)}.app-title-row{justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.app-title-row h1{text-wrap:balance}.app-head-actions{flex:none;gap:8px;margin-top:10px;display:flex}.app-r-toggle{border:1px solid var(--field);height:36px;color:var(--fg);font:600 .9rem var(--f-sans);cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:6px;padding:0 14px;display:inline-flex}.app-r-toggle svg{width:16px;height:16px}.app-r-toggle:hover{color:var(--fg);border-color:currentColor}.app-r-toggle[aria-expanded=true]{background:var(--ns-code);border-color:var(--ns-code);color:#fff}@media (prefers-color-scheme:dark){.app-r-toggle[aria-expanded=true]{color:#1a0f16}}.app-star-big{opacity:1;border:1px solid var(--field);width:auto;height:36px;font:600 .9rem var(--f-sans);color:var(--fg);border-radius:999px;align-items:center;gap:6px;padding:0 14px;display:inline-flex;position:static}.app-star-big:hover{border-color:currentColor}.app-scrim{display:none}.rp-send{gap:8px;margin-top:6px;display:flex}.rp-send button{font:600 .78rem/1.2 var(--f-sans);cursor:pointer;border:1px solid var(--ns-code);color:var(--ns-code);background:0 0;border-radius:999px;padding:4px 11px}.rp-send button:hover{background:color-mix(in srgb, var(--ns-code) 10%, transparent)}.rp-ex{margin-top:10px}.rp-ex button{font:600 .8rem/1.2 var(--f-sans);cursor:pointer;border:1px solid var(--ns-code);color:var(--ns-code);background:0 0;border-radius:999px;align-items:center;gap:6px;padding:4px 11px 4px 9px;display:inline-flex}.rp-ex button svg{width:15px;height:15px}.rp-ex button:hover{background:color-mix(in srgb, var(--ns-code) 10%, transparent)}.rp{background:var(--panel);border-left:1px solid var(--rule);height:100vh;font:.82rem/1.3 var(--f-sans);--ns-code:#9b2a6e;flex-direction:column;display:flex;position:sticky;top:0}@media (prefers-color-scheme:dark){.rp{--ns-code:#d6a3c4}}.rp button{font:600 .78rem/1.2 var(--f-sans);cursor:pointer;border:1px solid var(--ns-code);color:var(--ns-code);background:0 0;border-radius:4px;padding:4px 9px}.rp button:hover{background:color-mix(in srgb, var(--ns-code) 10%, transparent)}.rp button.ghost{border-color:var(--rule);color:var(--muted)}.rp button.primary{background:var(--ns-code);color:#fff}@media (prefers-color-scheme:dark){.rp button.primary{color:#1a0f16}}.rp-head{border-bottom:1px solid var(--rule);align-items:center;gap:10px;padding:12px 14px;display:flex}.rp-head strong{font-size:.95rem}.rp-status{color:var(--muted);flex:1}.rp[data-state=running] .rp-status:after{content:"";background:var(--ns-code);border-radius:50%;width:6px;height:6px;margin-left:6px;animation:1s infinite r-pulse;display:inline-block}@keyframes r-pulse{50%{opacity:.2}}.rp .rp-close{width:36px;height:36px;color:var(--muted);border:0;border-radius:8px;place-items:center;margin:-6px -8px -6px 0;padding:0;display:grid}.rp button[data-act=line]{border-radius:6px;min-height:44px;padding:0 16px;font-size:.85rem}.rp button[data-act=all]{min-height:32px}@media (pointer:coarse){.rp button,.rp-send button,.rp-ex button,.rp-more>summary{min-height:32px}}.rp-bar{border-bottom:1px solid var(--rule);background:color-mix(in srgb, var(--rule) 30%, transparent);justify-content:space-between;align-items:center;gap:6px;padding:6px 10px 6px 14px;display:flex}.rp-label{font:600 .8125rem/1 var(--f-sans);color:var(--muted)}.rp-actions{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:6px;display:inline-flex}.rp-actions button{white-space:nowrap}.rp button:has(>svg),.rp-send button:has(>svg){justify-content:center;align-items:center;gap:4px;display:inline-flex}.rp button>svg,.rp-send button>svg{fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;width:14px;height:14px}.rp button>svg.play,.rp-send button>svg.play{fill:currentColor;stroke-width:1px;width:11px;height:11px}.rp-close>svg{width:18px!important;height:18px!important}.rp{container-type:inline-size}.rp-more{display:none;position:relative}.rp-more>summary{border:1px solid var(--rule);width:30px;height:26px;color:var(--muted);cursor:pointer;border-radius:4px;place-items:center;list-style:none;display:grid}.rp-more>summary::-webkit-details-marker{display:none}.rp-more>summary svg{stroke-width:3px;width:18px;height:18px}.rp-menu{z-index:3;background:var(--panel);border:1px solid var(--rule);border-radius:6px;gap:4px;padding:6px;display:grid;position:absolute;top:calc(100% + 4px);right:0;box-shadow:0 6px 18px #00000026}.rp-menu button{text-align:left}@container (width<=460px){.rp-wide{display:none}.rp-more{display:block}.rp-more>summary{width:40px;height:32px}}.rp-script{border-bottom:1px solid var(--rule);flex-direction:column;flex:0 0 38%;min-height:0;display:flex}.rp-code{--r-lh:calc(.84rem * 1.55);flex:1;min-height:0;display:flex}.rp .rp-gutter{text-align:right;user-select:none;min-width:2.4em;font:.84rem/1.55 var(--f-mono);color:var(--muted);border:0;border-right:1px solid var(--rule);background:0 0;border-radius:0;margin:0;padding:10px 8px 10px 12px;overflow:hidden}.rp-editor{resize:none;min-width:0;font:.84rem/1.55 var(--f-mono);color:var(--ns-code);tab-size:2;background:0 0;border:0;outline:0;flex:1;margin:0;padding:10px 12px}.rp-editor:focus-visible,.rp-input:focus-visible{box-shadow:inset 0 0 0 2px var(--accent)}.rp-keys{border-top:1px solid var(--rule);color:var(--muted);margin:0;padding:4px 14px 5px;font-size:.75rem}.rp-editor::placeholder{color:var(--muted);font-family:var(--f-sans);white-space:normal}.rp-editor:focus{background:linear-gradient(color-mix(in srgb, var(--ns-code) 8%, transparent), color-mix(in srgb, var(--ns-code) 8%, transparent)) no-repeat 0 calc(10px + var(--r-line,0) * var(--r-lh)) / 100% var(--r-lh);background-attachment:local}.rp-env{border-bottom:1px solid var(--rule);flex:none}.rp-env>summary{cursor:pointer;background:color-mix(in srgb, var(--rule) 30%, transparent);align-items:center;gap:8px;padding:7px 14px;list-style:none;display:flex}.rp-env>summary::-webkit-details-marker{display:none}.rp-env>summary:before,.rp-env-item>summary:before{content:"";border-right:1.5px solid var(--muted);border-bottom:1.5px solid var(--muted);width:5px;height:5px;transform:rotate(-45deg)}.rp-env[open]>summary:before,.rp-env-item[open]>summary:before{transform:rotate(45deg)}.rp-env-count{color:var(--muted);font-size:.75rem}.rp-env-list{border-top:1px solid var(--rule);max-height:32vh;padding:4px 0 8px;overflow-y:auto}.rp-env-empty{color:var(--muted);margin:6px 14px}.rp-env-group{font:600 .75rem/1 var(--f-sans);color:var(--muted);margin:6px 14px 2px}.rp-env-item>summary{cursor:pointer;font:.8rem/1.45 var(--f-mono);grid-template-columns:minmax(4.5em,auto) 1fr;gap:12px;padding:3px 14px 3px 26px;list-style:none;display:grid;position:relative}.rp-env-item>summary::-webkit-details-marker{display:none}.rp-env-item>summary:before{position:absolute;top:9px;left:13px}.rp-env-item>summary:hover{background:color-mix(in srgb, var(--ns-code) 6%, transparent)}.rp-env-name{color:var(--ns-code);justify-self:start;margin-left:-3px;padding:0 3px;font-weight:500}.rp-env-short{color:var(--fg);text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.rp-env-item.changed .rp-env-name{background:color-mix(in srgb, var(--accent) 18%, transparent);border-radius:3px}.rp .rp-env-long{font:.76rem/1.45 var(--f-mono);color:var(--muted);background:var(--bg);border:1px solid var(--rule);white-space:pre;border-radius:4px;max-height:14rem;margin:2px 14px 6px 26px;padding:6px 10px;overflow-x:auto}.rp-console{flex-direction:column;flex:auto;min-height:0;display:flex}.rp-out{flex:1;padding:6px 14px;overflow-y:auto}.rp-out pre.r-console{background:0 0;border:0;margin:0;padding:2px 0}.rp-note{font:.8rem/1.4 var(--f-sans);color:var(--muted);margin:6px 0}.rp-fail{color:var(--fg)}.rp-fail button{margin-left:4px}.rp-status button{margin-left:6px;padding:1px 8px}.rp-prompt{border-top:1px solid var(--rule);font-family:var(--f-mono);color:var(--muted);align-items:center;gap:6px;padding:6px 14px;display:flex}.rp-input{min-width:0;font:.84rem/1.4 var(--f-mono);color:var(--ns-code);background:0 0;border:0;outline:0;flex:1;padding:4px}.rp-plots{border-top:1px solid var(--rule);flex-direction:column;flex:0 0 40%;min-height:0;display:none}.rp.has-plot .rp-plots{display:flex}.rp-plotnum{color:var(--muted);font-size:.75rem}.rp-plot{flex:1;place-items:center;min-height:0;padding:8px;display:grid}.rp-plot canvas.r-plot{width:auto;max-width:100%;max-height:100%;margin:0}@media (width>=1100px){.app.has-pane.r-open{grid-template-columns:var(--rail-w) minmax(0, 1fr) var(--pane-w)}.app:not(.r-open) .rp{display:none}}@media (width<=1099px){.app:not(.r-open) .rp,.app .rp:not(.inline){display:none}.app .rp.inline .rp-script{flex:none}.app .rp.inline .rp-code{height:calc(var(--r-lh) * 6 + 14px);flex:none}.app .rp.inline{scroll-margin:56px 0 calc(var(--bar-h,0px) + 12px);border:0;border-top:1px solid color-mix(in srgb, var(--ns-blue) 35%, transparent);background:0 0;border-radius:0;height:min(70vh,560px);margin:12px 0 18px;position:relative;overflow:hidden}}@media (width<=760px){.app{--rail-w:0px;--bar-h:64px;grid-template-columns:minmax(0,1fr)}.app-rail{height:calc(var(--bar-h) + env(safe-area-inset-bottom));padding:4px 4px calc(4px + env(safe-area-inset-bottom));flex-direction:row;justify-content:space-around;position:fixed;inset:auto 0 0}.app-logo{display:none}.app-rail a:not(.app-logo){flex:1;width:auto;padding:6px 0}.app-rail a[aria-current=page]:before,.app-rail a[data-here]:before{display:none}.app-rail .app-rail-end{margin-top:0}.app-list{width:100vw;left:0;bottom:calc(var(--bar-h) + env(safe-area-inset-bottom))}.app-main{padding-bottom:calc(var(--bar-h) + 12px + env(safe-area-inset-bottom))}}.app-main{container-type:inline-size}.lesson-frame{grid-template-columns:minmax(0,38rem) minmax(0,1fr);justify-content:center;align-items:start;gap:56px;max-width:calc(60rem + 56px);margin-inline:auto;display:grid}.lesson-frame>.lesson-page{margin-inline:0}.lesson-scroll{height:100vh;padding:28px 0;position:sticky;top:0}.ls-track{cursor:pointer;touch-action:none;user-select:none;height:100%;position:relative}.ls-line{background:var(--rule);width:1px;position:absolute;top:0;bottom:0;left:6px}.ls-thumb{background:color-mix(in srgb, var(--accent) 42%, transparent);width:9px;box-shadow:inset 0 0 0 1px color-mix(in srgb, var(--accent) 85%, transparent);border-radius:5px;position:absolute;left:2px}.lesson-scroll.dragging .ls-thumb,.ls-track:hover .ls-thumb{background:color-mix(in srgb, var(--accent) 60%, transparent)}.ls-mark{left:18px;right:0;top:var(--ly);font:400 .78rem/1.3 var(--f-sans);color:var(--muted);white-space:nowrap;text-overflow:ellipsis;text-decoration:none;position:absolute;overflow:hidden}.ls-mark:before{content:"";background:var(--rule);width:9px;height:1px;position:absolute;top:.62em;left:-12px}.ls-mark.ls-sec{font:600 .8125rem/1.3 var(--f-sans);color:var(--fg)}.ls-sec:before{background:var(--ns-blue,var(--accent));width:11px;height:2px;left:-14px}.ls-def{font-style:italic}.ls-mark .katex,.ls-sheet-list .katex{font-size:1.08em}.ls-mark .katex.ls-display,.ls-sheet-list .katex.ls-display{font-size:.92em}.ls-mark .katex-html,.ls-sheet-list .katex-html{white-space:nowrap}.ls-mark.ls-part{font-weight:600}.ls-mark.ls-ex{color:color-mix(in srgb, var(--fg) 82%, var(--bg));white-space:normal;-webkit-line-clamp:var(--lines,1);-webkit-box-orient:vertical;font-size:.8125rem;display:-webkit-box}.ls-mark.ls-ex:focus-visible{-webkit-line-clamp:8;z-index:2;background:var(--bg);box-shadow:0 0 0 4px var(--bg)}.ls-mark:hover{color:var(--accent)}.ls-mark.in-view{color:var(--fg)}.ls-mark.ls-sec.current{color:var(--ns-blue,var(--accent))}@container (width<=600px){.app-title-row{flex-direction:column;gap:0}.app-head-actions{margin-top:2px}}@container (width<=1019px){.lesson-frame{grid-template-columns:minmax(0,38rem)}.lesson-scroll{display:none}}:root.map-sheet .lesson-frame{grid-template-columns:minmax(0,38rem)}:root.map-sheet .lesson-scroll{display:none}@container (width>=1020px){:root:not(.map-sheet) .app .lesson-map-open,:root:not(.map-sheet) .lesson .section-nav a.section-contents,:root:not(.map-sheet) .app .lesson-current{display:none}}@container (width<=1019px){.lesson [id]{scroll-margin-top:56px}}:root.map-sheet .lesson [id]{scroll-margin-top:56px}.lesson .box[id]{scroll-margin-top:24px}.lesson .box [id]{scroll-margin-top:38px}@container (width<=1019px){.lesson .box[id]{scroll-margin-top:64px}.lesson .box [id]{scroll-margin-top:78px}}:root.map-sheet .lesson .box[id]{scroll-margin-top:64px}:root.map-sheet .lesson .box [id]{scroll-margin-top:78px}.lesson-map-open{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);font:600 .9rem/1.3 var(--f-sans);color:var(--fg);justify-content:space-between;align-items:center;margin:0 0 24px;padding:10px 0;text-decoration:none;display:flex}.lesson-map-open svg{fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;width:18px;height:18px;color:var(--muted)}.lesson-current{z-index:5;background:color-mix(in srgb, var(--bg) 94%, transparent);backdrop-filter:blur(6px);border-bottom:1px solid var(--rule);font:600 .85rem/1.3 var(--f-serif);color:var(--ns-blue,var(--accent));white-space:nowrap;text-overflow:ellipsis;margin:0 -16px;padding:8px 16px;text-decoration:none;display:block;position:sticky;top:0;overflow:hidden}.lesson-current[hidden]{display:none}.lesson-current{align-items:center;gap:10px;display:flex}.lesson-current .lc-count{font:600 .72rem/1 var(--f-sans);letter-spacing:.04em;color:var(--muted);flex:none}.lesson-current .lc-name{text-overflow:ellipsis;flex:1;min-width:0;overflow:hidden}.lesson-current svg{fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;flex:none;width:18px;height:18px}.ls-sheet-scrim{z-index:39;background:#0000004d;position:fixed;inset:0}.ls-sheet{left:var(--rail-w);z-index:40;background:var(--panel);border-radius:14px 14px 0 0;flex-direction:column;max-height:75vh;display:flex;position:fixed;bottom:0;right:0;box-shadow:0 -8px 30px #0003}.ls-sheet[hidden],.ls-sheet-scrim[hidden]{display:none}.ls-sheet-head{border-bottom:1px solid var(--rule);font:600 .9rem var(--f-sans);justify-content:space-between;align-items:center;padding:12px 12px 10px 18px;display:flex}.ls-sheet-close{width:36px;height:36px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:8px;place-items:center;display:grid}.ls-sheet-close svg{fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round;width:20px;height:20px}.ls-sheet-list{margin:0;padding:6px 0 14px;list-style:none;overflow-y:auto}.ls-sheet-list a{color:color-mix(in srgb, var(--fg) 85%, var(--bg));font:.9rem/1.35 var(--f-sans);padding:9px 18px 9px 30px;text-decoration:none;display:block}.ls-sheet-list .ls-sec a{font:600 1rem/1.3 var(--f-sans);color:var(--fg);padding-top:14px;padding-left:18px}.ls-sheet-list .ls-sec[data-current] a{color:var(--ns-blue,var(--accent))}.ls-sheet-list .ls-def a{color:var(--muted);font-style:italic}.ls-sheet-list li.in-view a{color:var(--fg);font-weight:600}.ls-sheet-list .ls-part a{color:var(--muted);padding-left:18px;font-weight:600}.ls-sheet-list a:focus{outline:2px solid var(--accent);outline-offset:-2px;border-radius:4px}@media (width>=761px){.ls-sheet{--main-w:calc(100vw - var(--rail-w));width:min(42rem, var(--main-w));right:auto;left:calc(var(--rail-w) + (var(--main-w) - min(42rem, var(--main-w))) / 2)}}@media (width>=1100px){.app.has-pane.r-open .ls-sheet{--main-w:calc(100vw - var(--rail-w) - var(--pane-w))}}@media (width<=760px){.ls-sheet{left:0;right:0;bottom:calc(var(--bar-h) + env(safe-area-inset-bottom))}}.lesson .fade-r{mask-image:linear-gradient(90deg,#000 calc(100% - 32px),#0000)}.lesson .fade-l{mask-image:linear-gradient(270deg,#000 calc(100% - 32px),#0000)}.lesson .fade-l.fade-r{mask-image:linear-gradient(90deg,#0000,#000 32px calc(100% - 32px),#0000)}