@font-face{font-family:"Lqn Sans";src:url(/assets/lqn-t/lqn-sans.woff2) format("woff2");font-weight:100 700;font-display:swap}
@font-face{font-family:"Lqn Sans";src:url(/assets/lqn-t/lqn-sans-italic.woff2) format("woff2");font-weight:100 700;font-style:italic;font-display:swap}
@font-face{font-family:"Lqn Mono";src:url(/assets/lqn-t/lqn-mono.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Lqn Mono";src:url(/assets/lqn-t/lqn-mono-600.woff2) format("woff2");font-weight:600;font-display:swap}

:root{
  --bg:#f5f7f9;--paper:#fff;--ink:#111720;--ink2:#2b3440;--muted:#5d6876;--line:#dfe4ea;--soft:#eef2f6;
  --acc:#2d5bd8;--acc-deep:#1c3f9e;--acc-tint:#e9effc;
  --code:#0f1622;--code-ink:#e2e8f0;--code-line:#1f2a3a;
  --sans:"Lqn Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"Lqn Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --w:1240px;--r:8px;--head:64px
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0c1016;--paper:#121821;--ink:#e6ebf1;--ink2:#c5ced8;--muted:#93a0ad;--line:#232c38;--soft:#18202b;
    --acc:#7ea2ff;--acc-deep:#a9c0ff;--acc-tint:#1a2540;--code:#0a0f17;--code-line:#1c2533}
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--head) + 16px)}
body.lqn-t{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.55 var(--sans);overflow-x:hidden}
.lqn-t a{color:inherit;text-decoration:none}
.lqn-t img{max-width:100%;height:auto}
.lqn-wrap{max-width:var(--w);margin:0 auto;padding:0 24px}
.lqn-narrow{max-width:860px}
.lqn-skip{position:absolute;left:-9999px}.lqn-skip:focus{left:12px;top:12px;z-index:30;background:var(--paper);padding:8px 12px}
.lqn-vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.lqn-t :focus-visible{outline:2px solid var(--acc);outline-offset:2px}

/* header */
.lqn-head{position:sticky;top:0;z-index:20;background:var(--paper);border-top:3px solid var(--acc);border-bottom:1px solid var(--line);transition:box-shadow .2s}
.lqn-head.lqn-raised{box-shadow:0 6px 18px -12px rgba(16,24,40,.35)}
.lqn-bar{display:flex;align-items:center;gap:26px;min-height:var(--head);max-width:1440px}
.lqn-logo{display:inline-flex;align-items:center;gap:10px;flex:none;color:var(--ink)}
.lqn-mark{display:inline-grid;color:var(--acc)}
.lqn-word{font:700 18px/1 var(--sans);letter-spacing:-.015em;white-space:nowrap}
.lqn-word span{font-weight:450;color:var(--muted)}
.lqn-nav{display:flex;gap:4px;flex:1;min-width:0}
.lqn-nav a{position:relative;padding:8px 10px;font:500 15px/1 var(--sans);color:var(--ink2);white-space:nowrap}
.lqn-nav a::after{content:"";position:absolute;left:10px;right:10px;bottom:2px;border-top:2px solid var(--acc);transform:scaleX(0);transform-origin:left;transition:transform .2s}
.lqn-nav a:hover{color:var(--ink)}.lqn-nav a:hover::after,.lqn-nav a[aria-current]::after{transform:scaleX(1)}
.lqn-nav a[aria-current]{color:var(--acc-deep)}
.lqn-find{position:relative;display:flex;align-items:center;gap:8px;flex:none;width:280px;height:38px;padding:0 10px 0 12px;border:1px solid var(--line);border-radius:var(--r);background:var(--soft);color:var(--muted)}
.lqn-find:focus-within{border-color:var(--acc);background:var(--paper)}
.lqn-find input{flex:1;min-width:0;border:0;background:none;font:400 14.5px var(--sans);color:var(--ink)}
.lqn-find input:focus{outline:none}
.lqn-find input::-webkit-search-cancel-button{display:none}
.lqn-find kbd{font:500 11px/1 var(--mono);padding:3px 6px;border:1px solid var(--line);border-radius:4px;color:var(--muted);background:var(--paper)}
.lqn-results{position:absolute;top:44px;right:0;width:min(460px,92vw);max-height:70vh;overflow:auto;background:var(--paper);border:1px solid var(--line);border-radius:var(--r);box-shadow:0 18px 40px -18px rgba(16,24,40,.45);padding:6px}
.lqn-results a{display:block;padding:10px 12px;border-radius:6px;color:var(--ink)}
.lqn-results a:hover,.lqn-results a.lqn-on{background:var(--acc-tint)}
.lqn-results b{display:block;font:600 14.5px/1.3 var(--sans)}
.lqn-results span{display:block;margin-top:3px;font:400 13px/1.45 var(--sans);color:var(--muted)}
.lqn-results p{margin:0;padding:12px;font-size:14px;color:var(--muted)}
.lqn-tocbtn{display:none;align-items:center;gap:6px;flex:none;height:36px;padding:0 10px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper);color:var(--ink2);font:500 14px var(--sans);cursor:pointer}

/* layout */
main#lqn-main{min-height:60vh}
.lqn-book{display:grid;grid-template-columns:272px minmax(0,1fr) 220px;gap:44px;max-width:1440px;margin:0 auto;padding:0 24px}

/* book contents */
.lqn-toc{position:sticky;top:var(--head);height:calc(100vh - var(--head));border-right:1px solid var(--line);margin-left:-24px}
.lqn-toc-in{height:100%;overflow:auto;padding:24px 18px 48px 24px;scrollbar-width:thin}
.lqn-toc section+section{margin-top:18px}
.lqn-toc h2{margin:0 0 6px;font:600 12.5px/1.3 var(--sans);color:var(--muted)}
.lqn-toc ol{list-style:none;margin:0;padding:0}
.lqn-toc a{display:flex;gap:8px;padding:5px 8px;margin:0 -8px;border-radius:6px;font:450 14.5px/1.35 var(--sans);color:var(--ink2);transition:background .15s,color .15s}
.lqn-toc a span{flex:none;min-width:1.6em;font:400 12px/1.6 var(--mono);color:var(--muted)}
.lqn-toc a:hover{background:var(--soft);color:var(--ink)}
.lqn-toc a[aria-current]{background:var(--acc-tint);color:var(--acc-deep);font-weight:600}
.lqn-toc a[aria-current] span{color:var(--acc-deep)}

/* the chapter */
.lqn-chapter{min-width:0;padding:34px 0 72px}
.lqn-crumbs{display:flex;gap:8px;font:400 13px/1 var(--mono);color:var(--muted)}
.lqn-crumbs a:hover{color:var(--acc-deep)}
.lqn-chapter h1{margin:14px 0 14px;font:700 clamp(30px,4vw,42px)/1.12 var(--sans);letter-spacing:-.022em}
.lqn-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px;font:400 13px/1.2 var(--mono);color:var(--muted)}
.lqn-badge{padding:4px 8px;border-radius:5px;background:var(--soft);color:var(--ink2);font:500 12px/1.2 var(--sans)}
.lqn-badge-new{background:var(--acc-tint);color:var(--acc-deep)}
.lqn-stamp{margin:18px 0 0;padding:12px 14px;border-left:3px solid var(--acc);background:var(--paper);border-radius:0 var(--r) var(--r) 0;font:400 14px/1.5 var(--sans);color:var(--ink2)}
.lqn-page h1{margin-top:0}
.lqn-page{padding-top:40px}

/* prose */
.lqn-prose{max-width:76ch;margin-top:26px;font-size:17px;line-height:1.72;color:var(--ink2);overflow-wrap:break-word}
.lqn-prose a{overflow-wrap:anywhere}
.lqn-prose > :first-child{margin-top:0}
.lqn-prose p,.lqn-prose ul,.lqn-prose ol,.lqn-prose blockquote,.lqn-prose pre,.lqn-scroll{margin:0 0 1.1em}
.lqn-prose h2,.lqn-prose h3,.lqn-prose h4{position:relative;color:var(--ink);letter-spacing:-.012em;scroll-margin-top:calc(var(--head) + 16px)}
.lqn-prose h2{margin:2.1em 0 .6em;font:650 25px/1.25 var(--sans);padding-top:.2em}
.lqn-prose h3{margin:1.7em 0 .5em;font:650 19.5px/1.3 var(--sans)}
.lqn-prose h4{margin:1.5em 0 .4em;font:650 17px/1.3 var(--sans)}
.lqn-anchor{margin-left:.35em;color:var(--muted);opacity:0;font-weight:400;transition:opacity .15s}
.lqn-prose :is(h2,h3,h4):hover .lqn-anchor{opacity:1}
.lqn-prose a{color:var(--acc-deep);text-decoration:underline;text-decoration-color:color-mix(in srgb,var(--acc) 40%,transparent);text-underline-offset:3px;text-decoration-thickness:1px;transition:text-decoration-color .15s}
.lqn-prose a:hover{text-decoration-color:var(--acc)}
.lqn-prose a.lqn-anchor{text-decoration:none}
.lqn-prose li{margin:.3em 0}
.lqn-prose li::marker{color:var(--muted)}
.lqn-prose strong{color:var(--ink);font-weight:620}
.lqn-prose blockquote{padding:2px 0 2px 16px;border-left:3px solid var(--line);color:var(--muted)}
.lqn-prose hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.lqn-prose :not(pre) > code{padding:.12em .38em;border-radius:5px;background:var(--soft);border:1px solid var(--line);font:400 .86em/1.4 var(--mono);color:var(--ink);overflow-wrap:anywhere}
.lqn-prose pre{position:relative;padding:16px 18px;border-radius:var(--r);background:var(--code);color:var(--code-ink);overflow:auto;font:400 14px/1.6 var(--mono);border:1px solid var(--code-line)}
.lqn-prose pre code{font:inherit;background:none;padding:0;white-space:pre}
.lqn-copy{position:absolute;top:8px;right:8px;padding:5px 9px;border:1px solid #2c3a4f;border-radius:5px;background:#162132;color:#c3cedb;font:500 12px/1 var(--sans);cursor:pointer;opacity:0;transition:opacity .15s,background .15s}
.lqn-prose pre:hover .lqn-copy,.lqn-copy:focus-visible{opacity:1}
.lqn-copy:hover{background:#1f2e46}
@media (hover:none){.lqn-copy{opacity:1}}
.lqn-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--paper)}
.lqn-prose table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.5}
.lqn-prose th,.lqn-prose td{padding:9px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.lqn-prose th{font-weight:620;color:var(--ink);background:var(--soft)}
.lqn-prose tr:last-child td{border-bottom:0}
.lqn-prose img{border-radius:var(--r);border:1px solid var(--line)}

/* syntax colours (highlight.js 10 classes) */
.hljs-comment,.hljs-quote{color:#7c8a9c;font-style:italic}
.hljs-keyword,.hljs-selector-tag,.hljs-built_in,.hljs-type{color:#82aaff}
.hljs-string,.hljs-regexp,.hljs-symbol,.hljs-bullet{color:#a5d6a0}
.hljs-number,.hljs-literal,.hljs-meta{color:#f5b37a}
.hljs-attr,.hljs-attribute,.hljs-variable,.hljs-template-variable,.hljs-name,.hljs-tag{color:#7fd3e8}
.hljs-title,.hljs-section,.hljs-function{color:#e6c07b}
.hljs-deletion{color:#f28b82}.hljs-addition{color:#a5d6a0}
.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:600}

/* previous / next */
.lqn-steps{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:76ch;margin-top:48px;padding-top:24px;border-top:1px solid var(--line)}
.lqn-step{display:flex;flex-direction:column;gap:4px;padding:14px 16px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper);transition:border-color .15s,transform .15s}
.lqn-step span{font:400 12.5px/1 var(--mono);color:var(--muted)}
.lqn-step b{font:600 15.5px/1.3 var(--sans);color:var(--ink)}
.lqn-step-next{text-align:right}
.lqn-step:hover{border-color:var(--acc);transform:translateY(-2px)}

/* on this page */
.lqn-otp{position:relative}
.lqn-otp-in{position:sticky;top:calc(var(--head) + 30px);max-height:calc(100vh - var(--head) - 60px);overflow:auto;padding-top:34px}
.lqn-otp h2{margin:0 0 8px;font:600 12.5px/1.3 var(--sans);color:var(--muted)}
.lqn-otp ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.lqn-otp a{display:block;padding:5px 0 5px 12px;margin-left:-1px;border-left:2px solid transparent;font:400 13.5px/1.35 var(--sans);color:var(--muted);transition:color .15s,border-color .15s}
.lqn-otp a:hover{color:var(--ink)}
.lqn-otp a.lqn-on{color:var(--acc-deep);border-left-color:var(--acc)}

/* home */
.lqn-hero{background:var(--paper);border-bottom:1px solid var(--line)}
.lqn-hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:56px;align-items:center;padding-top:64px;padding-bottom:64px}
.lqn-kicker{margin:0 0 14px;font:400 13px/1 var(--mono);color:var(--acc-deep)}
.lqn-hero h1{margin:0;font:700 clamp(34px,5vw,56px)/1.05 var(--sans);letter-spacing:-.03em;max-width:17ch}
.lqn-hero-sub{margin:18px 0 0;max-width:52ch;font-size:18px;line-height:1.6;color:var(--ink2)}
.lqn-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.lqn-btn{display:inline-flex;align-items:center;height:44px;padding:0 18px;border-radius:var(--r);background:var(--acc);color:#fff !important;font:600 15px/1 var(--sans);transition:background .15s,transform .15s}
.lqn-btn:hover{background:var(--acc-deep);transform:translateY(-1px)}
@media (prefers-color-scheme:dark){.lqn-btn{color:#0b1220 !important}.lqn-btn:hover{background:#c3d3ff}}
.lqn-btn-ghost{background:none;color:var(--ink) !important;border:1px solid var(--line)}
.lqn-btn-ghost:hover{background:var(--soft);border-color:var(--muted)}
.lqn-term{border-radius:12px;background:var(--code);border:1px solid var(--code-line);box-shadow:0 30px 60px -36px rgba(15,22,34,.7);overflow:hidden}
.lqn-term-bar{display:flex;align-items:center;gap:7px;padding:11px 14px;border-bottom:1px solid var(--code-line)}
.lqn-term-bar i{width:10px;height:10px;border-radius:50%;background:#2b3748}
.lqn-term-bar span{margin-left:8px;font:400 12px/1 var(--mono);color:#7c8a9c}
.lqn-term pre{margin:0;padding:18px 20px 22px;font:400 13.5px/1.75 var(--mono);color:var(--code-ink);overflow:auto}
.lqn-p{color:#82aaff}.lqn-o{color:#8a98ab}
.lqn-cur{display:inline-block;width:8px;height:1.1em;vertical-align:-.2em;background:#82aaff;animation:lqn-blink 1.1s steps(1) infinite}
@keyframes lqn-blink{50%{opacity:0}}
.lqn-sec{padding:56px 0 8px}
.lqn-sec-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:8px 24px;margin-bottom:22px}
.lqn-sec-head h2{margin:0;font:700 28px/1.2 var(--sans);letter-spacing:-.02em}
.lqn-sec-head p{margin:0;color:var(--muted);font-size:15.5px}
.lqn-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.lqn-card{display:flex;flex-direction:column;gap:8px;padding:18px 18px 16px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper);transition:border-color .18s,transform .18s,box-shadow .18s}
.lqn-card:hover{border-color:var(--acc);transform:translateY(-3px);box-shadow:0 14px 28px -22px rgba(16,24,40,.5)}
.lqn-card-k{font:400 12px/1.2 var(--mono);color:var(--muted)}
.lqn-card b{font:650 18px/1.25 var(--sans);letter-spacing:-.01em}
.lqn-card:hover b{color:var(--acc-deep)}
.lqn-card-d{flex:1;font-size:14.5px;line-height:1.5;color:var(--ink2);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.lqn-card-f{font:400 12px/1.2 var(--mono);color:var(--acc-deep)}
.lqn-parts{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.lqn-part{padding:18px 18px 12px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper)}
.lqn-part header{display:flex;align-items:baseline;gap:10px;margin-bottom:8px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.lqn-part header span{font:600 13px/1 var(--mono);color:var(--acc)}
.lqn-part h3{margin:0;font:650 17px/1.3 var(--sans)}
.lqn-part ol{list-style:none;margin:0;padding:0}
.lqn-part li{display:flex;align-items:baseline;justify-content:space-between;gap:10px}
.lqn-part li a{display:flex;gap:8px;padding:5px 0;font-size:15px;color:var(--ink2)}
.lqn-part li a span{min-width:1.6em;font:400 12px/1.9 var(--mono);color:var(--muted)}
.lqn-part li a:hover{color:var(--acc-deep)}
.lqn-part li em{font:400 11.5px/1 var(--mono);font-style:normal;color:var(--acc-deep)}
.lqn-about{padding-bottom:64px}
.lqn-about .lqn-prose{max-width:78ch;margin-top:0;padding:28px 30px;border:1px solid var(--line);border-radius:var(--r);background:var(--paper)}
.lqn-about .lqn-prose h2:first-child{margin-top:0}
.lqn-404{padding:72px 24px}
.lqn-404 h1{font:700 40px/1.1 var(--sans);letter-spacing:-.02em;margin:0 0 12px}

/* footer */
.lqn-foot{margin-top:24px;background:#0f1620;color:#c7d0da}
.lqn-foot-grid{display:grid;grid-template-columns:1.4fr 1.3fr 1fr;gap:40px;padding-top:44px;padding-bottom:30px}
.lqn-logo-inv{color:#fff}.lqn-logo-inv .lqn-word span{color:#93a0ad}.lqn-logo-inv .lqn-mark{color:#7ea2ff}
.lqn-foot-brand p{margin:14px 0 0;max-width:42ch;font-size:14.5px;line-height:1.6;color:#9eabb8}
.lqn-foot h2{margin:0 0 12px;font:600 13px/1.2 var(--sans);color:#fff}
.lqn-foot-grid > div > a{display:block;padding:4px 0;font-size:14.5px;color:#b9c4cf}
.lqn-foot-links{display:grid;grid-template-columns:1fr 1fr;gap:0 18px}
.lqn-foot-links a{padding:4px 0;font-size:14.5px;color:#b9c4cf}
.lqn-foot a:hover{color:#fff}
.lqn-foot-base{padding-top:18px;padding-bottom:26px;border-top:1px solid #222d3a}
.lqn-foot-base p{margin:0;max-width:110ch;font-size:12.5px;line-height:1.6;color:#7f8c99}

/* motion */
@media (prefers-reduced-motion:no-preference){
  .lqn-chapter h1,.lqn-hero h1,.lqn-hero-sub,.lqn-cta,.lqn-term{animation:lqn-up .5s ease-out both}
  .lqn-hero-sub{animation-delay:.06s}.lqn-cta{animation-delay:.12s}.lqn-term{animation-delay:.16s}
  .lqn-rise{opacity:0;transform:translateY(14px);transition:opacity .45s ease-out,transform .45s ease-out}
  .lqn-rise.lqn-in{opacity:1;transform:none}
}
@keyframes lqn-up{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){*{animation:none !important;transition:none !important}}

/* narrower screens */
@media (max-width:1240px){.lqn-book{grid-template-columns:260px minmax(0,1fr)}.lqn-otp{display:none}}
@media (max-width:1060px){.lqn-nav{display:none}.lqn-find{margin-left:auto}}
@media (max-width:920px){
  .lqn-book{display:block}
  .lqn-tocbtn{display:inline-flex}
  .lqn-toc{position:fixed;z-index:25;top:0;left:0;bottom:0;width:min(330px,88vw);height:auto;margin:0;background:var(--paper);box-shadow:0 0 50px rgba(0,0,0,.25);transform:translateX(-105%);transition:transform .25s ease-out;visibility:hidden}
  .lqn-toc.lqn-open{transform:none;visibility:visible}
  .lqn-scrim{position:fixed;inset:0;z-index:24;background:rgba(10,14,20,.45)}
  .lqn-hero-grid{grid-template-columns:1fr;gap:36px;padding-top:44px;padding-bottom:44px}
  .lqn-cards{grid-template-columns:1fr 1fr}
  .lqn-foot-grid{grid-template-columns:1fr 1fr}
  .lqn-foot-brand{grid-column:1/-1}
}
@media (max-width:640px){
  .lqn-wrap,.lqn-book{padding:0 16px}
  .lqn-bar{gap:12px}
  .lqn-word span{display:none}
  .lqn-find{width:auto;flex:1;min-width:0}
  .lqn-find kbd{display:none}
  .lqn-tocbtn span{display:none}
  .lqn-results{right:-16px;width:calc(100vw - 16px)}
  .lqn-chapter{padding-top:24px}
  .lqn-prose{font-size:16.5px}
  .lqn-prose pre{margin-left:-16px;margin-right:-16px;border-radius:0;border-left:0;border-right:0;font-size:13px}
  .lqn-steps{grid-template-columns:1fr}
  .lqn-step-next{text-align:left}
  .lqn-cards{grid-template-columns:1fr}
  .lqn-parts{grid-template-columns:1fr}
  .lqn-about .lqn-prose{padding:20px 18px}
  .lqn-foot-grid{grid-template-columns:1fr}
}