:root{--sans-font:-apple-system,BlinkMacSystemFont,"Avenir Next",Avenir,"Nimbus Sans L",Roboto,"Noto Sans","Segoe UI",Arial,Helvetica,"Helvetica Neue",sans-serif;--mono-font:Consolas,Menlo,Monaco,"Andale Mono","Ubuntu Mono",monospace;--standard-border-radius:5px;--border-width:1px;--bg:#fff;--accent-bg:#f5f7ff;--text:#212121;--text-light:#585858;--border:#898ea4;--accent:#0d47a1;--accent-hover:#1266e2;--accent-text:var(--bg);--code:#d81b60;--preformatted:#444;--marked:#fd3;--disabled:#efefef}@media (prefers-color-scheme:dark){:root{color-scheme:dark;--bg:#212121;--accent-bg:#2b2b2b;--text:#dcdcdc;--text-light:#ababab;--accent:#ffb300;--accent-hover:#ffe099;--accent-text:var(--bg);--code:#f06292;--preformatted:#ccc;--disabled:#111}img,video{opacity:.8}}*,:before,:after{box-sizing:border-box}textarea,select,input,progress{-webkit-appearance:none;-moz-appearance:none;appearance:none}html{font-family:var(--sans-font);scroll-behavior:smooth}body{color:var(--text);background-color:var(--bg);grid-template-columns:1fr min(45rem,90%) 1fr;margin:0;font-size:1.15rem;line-height:1.5;display:grid}body>*{grid-column:2}body>header{background-color:var(--accent-bg);border-bottom:var(--border-width)solid var(--border);text-align:center;grid-column:1/-1;padding:0 .5rem 2rem}body>header>:only-child{margin-block-start:2rem}body>header h1{max-width:1200px;margin:1rem auto}body>header p{max-width:40rem;margin:1rem auto}main{padding-top:1.5rem}body>footer{color:var(--text-light);text-align:center;border-top:var(--border-width)solid var(--border);margin-top:4rem;padding:2rem 1rem 1.5rem;font-size:.9rem}h1{font-size:3rem}h2{margin-top:3rem;font-size:2.6rem}h3{margin-top:3rem;font-size:2rem}h4{font-size:1.44rem}h5{font-size:1.15rem}h6{font-size:.96rem}p{margin:1.5rem 0}p,h1,h2,h3,h4,h5,h6{overflow-wrap:break-word}h1,h2,h3{line-height:1.1}@media only screen and (width<=720px){h1{font-size:2.5rem}h2{font-size:2.1rem}h3{font-size:1.75rem}h4{font-size:1.25rem}}a,a:visited{color:var(--accent)}a:hover{text-decoration:none}button,.button,a.button,input[type=submit],input[type=reset],input[type=button]{border:var(--border-width)solid var(--accent);background-color:var(--accent);color:var(--accent-text);padding:.5rem .9rem;line-height:normal;text-decoration:none}.button[aria-disabled=true],input:disabled,textarea:disabled,select:disabled,button[disabled]{cursor:not-allowed;background-color:var(--disabled);border-color:var(--disabled);color:var(--text-light)}input[type=range]{padding:0}abbr[title]{cursor:help;text-decoration-line:underline;text-decoration-style:dotted}button:enabled:hover,.button:not([aria-disabled=true]):hover,input[type=submit]:enabled:hover,input[type=reset]:enabled:hover,input[type=button]:enabled:hover{background-color:var(--accent-hover);border-color:var(--accent-hover);cursor:pointer}.button:focus-visible,button:focus-visible:where(:enabled),input:enabled:focus-visible:where([type=submit],[type=reset],[type=button]){outline:2px solid var(--accent);outline-offset:1px}header nav{padding:1rem 0 0;font-size:1rem;line-height:2}header nav ul,header nav ol{flex-flow:wrap;place-content:space-around center;align-items:center;margin:0;padding:0;list-style-type:none;display:flex}header nav ul li,header nav ol li{display:inline-block}header nav a,header nav a:visited{border:var(--border-width)solid var(--border);border-radius:var(--standard-border-radius);color:var(--text);margin:0 .5rem 1rem;padding:.1rem 1rem;text-decoration:none;display:inline-block}header nav a:hover,header nav a.current,header nav a[aria-current=page],header nav a[aria-current=true]{border-color:var(--accent);color:var(--accent);cursor:pointer}@media only screen and (width<=720px){header nav a{border:none;padding:0;line-height:1;text-decoration:underline}}aside,details,pre,progress{background-color:var(--accent-bg);border:var(--border-width)solid var(--border);border-radius:var(--standard-border-radius);margin-bottom:1rem}aside{float:right;width:30%;margin-inline-start:15px;padding:0 15px;font-size:1rem}[dir=rtl] aside{float:left}@media only screen and (width<=720px){aside{float:none;width:100%;margin-inline-start:0}}article,fieldset,dialog{border:var(--border-width)solid var(--border);border-radius:var(--standard-border-radius);margin-bottom:1rem;padding:1rem}article h2:first-child,section h2:first-child,article h3:first-child,section h3:first-child{margin-top:1rem}section{border-top:var(--border-width)solid var(--border);border-bottom:var(--border-width)solid var(--border);margin:3rem 0;padding:2rem 1rem}section+section,section:first-child{border-top:0;padding-top:0}section+section{margin-top:0}section:last-child{border-bottom:0;padding-bottom:0}details{padding:.7rem 1rem}summary{cursor:pointer;word-break:break-all;margin:-.7rem -1rem;padding:.7rem 1rem;font-weight:700}details[open]>summary+*{margin-top:0}details[open]>summary{margin-bottom:.5rem}details[open]>:last-child{margin-bottom:0}table{border-collapse:collapse;margin:1.5rem 0}figure>table{width:max-content;margin:0}td,th{border:var(--border-width)solid var(--border);text-align:start;padding:.5rem}th{background-color:var(--accent-bg);font-weight:700}tr:nth-child(2n){background-color:var(--accent-bg)}table caption{margin-bottom:.5rem;font-weight:700}textarea,select,input,button,.button{font-size:inherit;border-radius:var(--standard-border-radius);box-shadow:none;max-width:100%;margin-bottom:.5rem;padding:.5em;font-family:inherit;display:inline-block}textarea,select,input{color:var(--text);background-color:var(--bg);border:var(--border-width)solid var(--border)}label{display:block}textarea:not([cols]){width:100%}select:not([multiple]){background-image:linear-gradient(45deg,transparent 49%,var(--text)51%),linear-gradient(135deg,var(--text)51%,transparent 49%);background-position:calc(100% - 15px),calc(100% - 10px);background-repeat:no-repeat;background-size:5px 5px,5px 5px;padding-inline-end:25px}[dir=rtl] select:not([multiple]){background-position:10px,15px}input[type=checkbox],input[type=radio]{vertical-align:middle;width:min-content;position:relative}input[type=checkbox]+label,input[type=radio]+label{display:inline-block}input[type=radio]{border-radius:100%}input[type=checkbox]:checked,input[type=radio]:checked{background-color:var(--accent)}input[type=checkbox]:checked:after{content:" ";border-right:solid var(--bg).08em;border-bottom:solid var(--bg).08em;background-color:#0000;border-radius:0;width:.2em;height:.4em;font-size:1.8em;position:absolute;top:.04em;left:.18em;transform:rotate(45deg)}input[type=radio]:checked:after{content:" ";background-color:var(--bg);border-radius:100%;width:.3em;height:.3em;font-size:1.8em;position:absolute;top:.125em;left:.125em}@media only screen and (width<=720px){textarea,select,input{width:100%}}input[type=color]{height:2.5rem;padding:.2rem}input[type=file]{border:0}hr{height:var(--border-width);background:var(--border);border:none;margin:1rem auto}mark{border-radius:var(--standard-border-radius);background-color:var(--marked);color:#000;padding:2px 5px}mark a{color:#0d47a1}img,video{border-radius:var(--standard-border-radius);max-width:100%;height:auto}figure{margin:0;display:block;overflow-x:auto}figure>img,figure>picture>img{margin-inline:auto;display:block}figcaption{text-align:center;color:var(--text-light);margin-block:1rem;font-size:.9rem;position:sticky;left:0}blockquote{border-inline-start:.35rem solid var(--accent);color:var(--text-light);margin-block:2rem;margin-inline:2rem 0;padding:.4rem .8rem;font-style:italic}cite{color:var(--text-light);font-size:.9rem;font-style:normal}dt{color:var(--text-light)}code,pre,pre span,kbd,samp{font-family:var(--mono-font);color:var(--code)}kbd{color:var(--preformatted);border:var(--border-width)solid var(--preformatted);border-bottom:3px solid var(--preformatted);border-radius:var(--standard-border-radius);padding:.1rem .4rem}pre{max-width:100%;color:var(--preformatted);padding:1rem 1.4rem;overflow:auto}pre code{color:var(--preformatted);background:0 0;margin:0;padding:0}progress{width:100%}progress:indeterminate{background-color:var(--accent-bg)}progress::-webkit-progress-bar{border-radius:var(--standard-border-radius);background-color:var(--accent-bg)}progress::-webkit-progress-value{border-radius:var(--standard-border-radius);background-color:var(--accent)}progress::-moz-progress-bar{border-radius:var(--standard-border-radius);background-color:var(--accent);transition-property:width;transition-duration:.3s}progress:indeterminate::-moz-progress-bar{background-color:var(--accent-bg)}dialog{background-color:var(--bg);max-width:40rem;margin:auto}dialog::backdrop{background-color:var(--bg);opacity:.8}@media only screen and (width<=720px){dialog{max-width:calc(100vw - 2rem)}}sup,sub{vertical-align:baseline;position:relative}sup{top:-.4em}sub{top:.3em}.notice{background:var(--accent-bg);border:var(--border-width)solid var(--border);border-radius:var(--standard-border-radius);margin:2rem 0;padding:1.5rem}@media print{@page{margin:1cm}body{display:block}body>header{background-color:unset}body>header nav,body>footer{display:none}article{border:none;padding:0}a[href^=http]:after{content:" <" attr(href)">"}abbr[title]:after{content:" (" attr(title)")"}a{text-decoration:none}p{widows:3;orphans:3}hr{border-top:var(--border-width)solid var(--border)}mark{border:var(--border-width)solid var(--border)}pre,table,figure,img,svg{break-inside:avoid}pre code{white-space:pre-wrap}}:root{color-scheme: light;--bg:#F6F6F3;--accent-bg:#F6F6F3;--text:#17171A;--text-light:#5E5B55;--border:#5E5B55;--accent:#17171A;--accent-hover:#17171A;--accent-text:#17171A;--clip:#F2B705;--edge:#A77C00;--ink:#17171A;--muted:#5E5B55;--ground:#F6F6F3;--u:8px;--s1:1rem;--s2:1.2rem;--s3:1.44rem;--s4:2.0736rem;--sans-font:"Figtree",system-ui,sans-serif;--standard-border-radius:4px;}@media (min-width: 760px){:root{--s2:1.25rem;--s3:1.5625rem;--s4:2.4414rem;}}::selection{background:var(--clip);color:var(--ink);}html{scrollbar-color:var(--muted) var(--ground);caret-color:var(--ink);scroll-behavior:smooth;}@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto;}}body{display:grid;grid-template-columns:1fr min(70rem,calc(100% - 32px)) 1fr;font-family:var(--sans-font);font-size:var(--s1);line-height:1.6;background:var(--ground);color:var(--ink);overflow-x:clip;}body > *{grid-column:2;}img,video{opacity:1;}h1,h2,h3{font-family:"Archivo","Figtree",sans-serif;font-weight:800;letter-spacing:-0.02em;text-wrap:balance;}p,li{text-wrap:pretty;}a,a:visited{color:var(--ink);text-decoration:underline;text-decoration-color:var(--clip);text-decoration-thickness:3px;text-underline-offset:4px;}:focus-visible{outline:3px solid var(--ink);outline-offset:3px;}.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;}body > header.hero{grid-column:1 / -1;text-align:left;background:var(--ground);border-bottom:1px solid var(--muted);padding:calc(var(--u) * 2) 0 calc(var(--u) * 7);display:grid;grid-template-columns:1fr min(70rem,calc(100% - 32px)) 1fr;}.hero-in{grid-column:2;display:grid;gap:calc(var(--u) * 3);align-items:start;}@media (min-width: 900px){.hero-in{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:calc(var(--u) * 6);align-items:center;padding-top:calc(var(--u) * 2);}}.brand{display:flex;align-items:center;gap:calc(var(--u) * 1.5);margin:0 0 calc(var(--u) * 2);}.brand img{width:72px;height:72px;border-radius:0;}@media (min-width: 900px){.brand img{width:112px;height:112px;}}.brand span{font-family:"Archivo",sans-serif;font-weight:800;font-size:var(--s2);}body > header.hero h1{font-size:var(--s4);line-height:1.08;margin:0 0 calc(var(--u) * 2);max-width:16ch;}body > header.hero p.lede{font-size:var(--s2);line-height:1.5;margin:0 0 calc(var(--u) * 3);color:var(--muted);max-width:34ch;}a.get-btn,a.get-btn:visited{display:inline-flex;align-items:center;justify-content:center;min-width:240px;min-height:56px;padding:0 calc(var(--u) * 3);background:var(--clip);color:var(--ink);text-decoration:none;font-family:"Archivo",sans-serif;font-weight:800;font-size:var(--s2);border-radius:6px;border:1px solid var(--ink);border-bottom:6px solid var(--edge);transition:transform 90ms ease-out,border-bottom-width 90ms ease-out;-webkit-tap-highlight-color:transparent;}a.get-btn:active{transform:translateY(4px);border-bottom-width:2px;}.under{margin:calc(var(--u) * 1.5) 0 0;font-size:var(--s1);color:var(--muted);}.stage{display:grid;gap:calc(var(--u) * 2);justify-items:start;}.switch{position:relative;display:inline-grid;grid-template-columns:1fr 1fr;min-height:48px;padding:4px;background:var(--ground);color:var(--ink);border:1px solid var(--ink);border-radius:6px;cursor:pointer;font-family:var(--sans-font);font-weight:600;font-size:var(--s1);-webkit-tap-highlight-color:transparent;}.switch:enabled:hover{background:var(--ground);border-color:var(--ink);}.switch .opt{position:relative;z-index:1;padding:0 calc(var(--u) * 2);display:flex;align-items:center;justify-content:center;min-height:40px;}.switch .knob{position:absolute;top:4px;bottom:4px;left:4px;width:calc(50% - 4px);background:var(--clip);border-radius:3px;transform:translateX(100%);transition:transform 220ms cubic-bezier(.16,1,.3,1);}[data-side="without"] .switch .knob{transform:translateX(0);}.switch.nudge .knob{animation:nudge 520ms cubic-bezier(.16,1,.3,1) 1;}@keyframes nudge{0%{transform:translateX(100%);}40%{transform:translateX(calc(100% - 6px));}100%{transform:translateX(100%);}}.card{perspective:900px;width:100%;max-width:400px;}.face{view-transition-name:card;transform-origin:50% 50%;border:1px solid var(--ink);border-radius:4px;background:var(--ground);padding:calc(var(--u) * 1) calc(var(--u) * 1) calc(var(--u) * 2);}.face svg{display:block;width:100%;height:auto;}.face p{margin:calc(var(--u) * 1) calc(var(--u) * 1) 0;font-size:var(--s1);color:var(--muted);}.card.turn-out .face{transform:rotateY(90deg);transition:transform 170ms ease-in;}.card.turn-in .face{animation:turnin 190ms cubic-bezier(.16,1,.3,1);}@keyframes turnin{from{transform:rotateY(-90deg);}to{transform:rotateY(0);}}::view-transition-old(card){animation:vtout 170ms ease-in both;}::view-transition-new(card){animation:vtin 190ms cubic-bezier(.16,1,.3,1) 170ms both;}@keyframes vtout{to{transform:rotateY(90deg);}}@keyframes vtin{from{transform:rotateY(-90deg);}to{transform:rotateY(0);}}@media (prefers-reduced-motion: reduce){.switch .knob{transition:none;}.switch.nudge .knob{animation:none;}.card.turn-out .face,.card.turn-in .face{transition:none;animation:none;transform:none;}::view-transition-old(card),::view-transition-new(card){animation:none;}}nav.toc{position:sticky;top:0;z-index:5;margin:calc(var(--u) * -3) 0 0;background:var(--ground);border:1px solid var(--muted);border-radius:4px;padding:0 calc(var(--u) * 1);display:flex;gap:calc(var(--u) * 2);overflow-x:auto;white-space:nowrap;scrollbar-width:none;}nav.toc a,nav.toc a:visited{display:inline-flex;align-items:center;min-height:48px;padding:0 calc(var(--u) * 1);text-decoration:none;font-weight:600;border-bottom:4px solid transparent;}nav.toc a[aria-current="true"]{border-bottom-color:var(--clip);}main{padding-top:0;}main > section{border:0;border-top:1px solid var(--muted);margin:0;padding:calc(var(--u) * 6) 0;display:grid;gap:calc(var(--u) * 2);scroll-margin-top:64px;}main > section:first-of-type{border-top:0;padding-top:calc(var(--u) * 7);}@media (min-width: 900px){main > section{grid-template-columns:16rem minmax(0,1fr);gap:calc(var(--u) * 6);}}.hang{display:grid;gap:calc(var(--u) * 1);align-content:start;}.num{font-family:"Archivo",sans-serif;font-weight:800;font-size:var(--s4);line-height:1;}.hang h2{margin:0;font-size:var(--s3);line-height:1.15;}.body > p{margin:0 0 calc(var(--u) * 2);max-width:62ch;}.q{border-top:1px solid var(--muted);padding:calc(var(--u) * 2) 0;}.q:first-of-type{border-top:0;padding-top:0;}.q > p.belief{margin:0 0 calc(var(--u) * 1.5);font-weight:600;}.q input{position:absolute;opacity:0;width:1px;height:1px;}.q label{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:96px;padding:0 calc(var(--u) * 2);margin:0 calc(var(--u) * 1) 0 0;border:1px solid var(--ink);border-radius:4px;cursor:pointer;font-weight:600;-webkit-tap-highlight-color:transparent;}.q input:focus-visible + label{outline:3px solid var(--ink);outline-offset:3px;}.q input:checked + label{background:var(--ink);color:var(--ground);}.q .fact{display:none;margin:calc(var(--u) * 1.5) 0 0;max-width:62ch;}.q input:checked ~ .fact{display:block;}.q .fact .ok,.q .fact .no{display:none;font-weight:600;}.q input.right:checked ~ .fact .ok{display:inline;}.q input.wrong:checked ~ .fact .no{display:inline;}figure.duo{margin:calc(var(--u) * 3) 0 0;max-width:460px;overflow:hidden;}figure.duo .tone{background:var(--clip);border-radius:4px;overflow:hidden;line-height:0;}figure.duo img{width:100%;height:auto;border-radius:0;filter:grayscale(1) contrast(1.15);mix-blend-mode:multiply;}figure.duo figcaption{font-size:var(--s1);color:var(--muted);margin-top:calc(var(--u) * 1);}ul.known{list-style:none;margin:0;padding:0;}ul.known li{display:grid;grid-template-columns:24px minmax(0,1fr);gap:calc(var(--u) * 1.5);padding:calc(var(--u) * 1.5) 0;border-top:1px solid var(--muted);max-width:62ch;}ul.known li:first-child{border-top:0;}ul.known svg{width:24px;height:24px;margin-top:2px;fill:none;stroke:var(--ink);stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}.chips{display:flex;flex-wrap:wrap;gap:calc(var(--u) * 1);margin:0 0 calc(var(--u) * 3);padding:0;list-style:none;}.chips li{padding:calc(var(--u) * 1) calc(var(--u) * 1.5);border-radius:4px;border:1px solid var(--ink);font-weight:600;}.chips.good li{background:var(--clip);}.chips-h{margin:0 0 calc(var(--u) * 1);font-family:"Archivo",sans-serif;font-weight:800;font-size:var(--s2);}.signs{display:grid;gap:calc(var(--u) * 3);grid-template-columns:1fr;margin:0 0 calc(var(--u) * 4);}@media (min-width: 600px){.signs{grid-template-columns:repeat(3,minmax(0,1fr));}}.sign{display:grid;grid-template-columns:64px minmax(0,1fr);gap:calc(var(--u) * 2);align-items:start;}@media (min-width: 600px){.sign{grid-template-columns:1fr;}}.sign svg{width:64px;height:64px;}.sign p{margin:0;}.sign strong{display:block;font-family:"Archivo",sans-serif;font-weight:800;font-size:var(--s2);}.last{border-top:1px solid var(--muted);padding-top:calc(var(--u) * 3);}.last p{margin:0 0 calc(var(--u) * 2);max-width:52ch;}body > footer{text-align:left;border-top:1px solid var(--muted);margin-top:calc(var(--u) * 6);padding:calc(var(--u) * 4) 0 calc(var(--u) * 4 + env(safe-area-inset-bottom));color:var(--muted);font-size:var(--s1);}.crumb{margin:0 0 calc(var(--u) * 2);color:var(--ink);font-weight:600;}.crumb span{color:var(--muted);font-weight:400;padding:0 calc(var(--u) * 0.5);}.flinks{display:flex;flex-wrap:wrap;gap:calc(var(--u) * 1) calc(var(--u) * 3);margin:0;padding:0;list-style:none;}.flinks a{display:inline-flex;min-height:44px;align-items:center;}body,html{max-width:100%;overflow-x:clip}@font-face{font-family: 'Archivo';font-style: normal;font-weight: 800;font-stretch: 100%;font-display: swap;src: url(../fonts/archivo-3ae203af.woff2) format('woff2');unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF;}@font-face{font-family: 'Archivo';font-style: normal;font-weight: 800;font-stretch: 100%;font-display: swap;src: url(../fonts/archivo-44c28fd9.woff2) format('woff2');unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}@font-face{font-family: 'Figtree';font-style: normal;font-weight: 400;font-display: swap;src: url(../fonts/figtree-ded1b392.woff2) format('woff2');unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF;}@font-face{font-family: 'Figtree';font-style: normal;font-weight: 400;font-display: swap;src: url(../fonts/figtree-fb0ed17c.woff2) format('woff2');unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}@font-face{font-family: 'Figtree';font-style: normal;font-weight: 600;font-display: swap;src: url(../fonts/figtree-ded1b392.woff2) format('woff2');unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF;}@font-face{font-family: 'Figtree';font-style: normal;font-weight: 600;font-display: swap;src: url(../fonts/figtree-fb0ed17c.woff2) format('woff2');unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}