/* Tomorrow Library — blue identity, October 2026. */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=Inter:wght@400;500;600;700&family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,500;1,8..60,400&display=swap');
:root{--paper:#dce9f8;--white:#eff6ff;--ink:#14365f;--muted:#44668d;--line:#b7cfe9;--accent:#1267bc;--sage:#cbdff7;--gold:#1d6dbb;--serif:'Source Serif 4',Georgia,'Times New Roman',serif;--sans:Inter,system-ui,-apple-system,'Segoe UI',sans-serif;--mono:'IBM Plex Mono','Courier New',monospace}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.65 var(--sans)}a{color:inherit;text-underline-offset:4px}a:hover{color:var(--accent)}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid var(--gold);outline-offset:4px}button{cursor:pointer}svg{display:block}img{max-width:100%}.skip{position:fixed;left:15px;top:-100px;z-index:100;background:var(--white);padding:12px}.skip:focus{top:12px}.network{height:38px;background:#0b2853;color:#c8dcf5;display:flex;justify-content:space-between;align-items:center;padding:0 4vw;font:11px var(--mono);letter-spacing:.03em}.network nav{display:flex;gap:25px}.network a{text-decoration:none}.network a:hover{color:#fff}.network [aria-current]{color:#fff;border-bottom:1px solid #79b9f7}.site-head{padding:24px 4vw;display:flex;align-items:center;gap:20px;border-bottom:1px solid var(--line);background:var(--paper)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none}.brand img{width:34px;height:34px;object-fit:contain}.brand-name{font:26px/1 var(--serif);letter-spacing:-.7px}.brand-name small{display:block;font:10px var(--mono);letter-spacing:1.6px;margin-top:8px;text-transform:uppercase;color:var(--muted)}.head-links{display:flex;gap:25px;align-items:center;margin-left:auto}.head-links a{font-size:13px;text-decoration:none}.search-open{display:flex;align-items:center;gap:25px;border:1px solid #aac6e7;border-radius:3px;background:transparent;color:var(--muted);padding:8px 12px;font-size:12px}.key{border:1px solid var(--line);border-radius:2px;padding:0 5px;font:11px var(--mono)}.menu-button{display:none;border:1px solid var(--line);background:transparent;padding:9px 12px}.layout{max-width:1540px;margin:auto;display:grid;grid-template-columns:238px minmax(0,1fr)}.sidebar{border-right:1px solid var(--line);padding:30px 25px 50px 4vw}.sidebar-inner{position:sticky;top:24px;max-height:calc(100vh - 45px);overflow:auto}.nav-group{font:10px var(--mono);letter-spacing:1.7px;text-transform:uppercase;color:var(--muted);margin:24px 0 9px}.nav-group:first-child{margin-top:0}.sidebar a{display:block;text-decoration:none;font-size:12px;padding:7px 10px;margin-left:-10px;color:var(--muted)}.sidebar a[aria-current]{background:var(--sage);color:var(--ink);border-left:2px solid var(--accent);font-weight:600}.sidebar a:hover{color:var(--accent);background:#c6dcf4}.sidebar .practice{padding-top:20px;margin-top:22px;border-top:1px solid var(--line)}.main{padding:52px clamp(25px,4vw,66px) 65px;min-width:0}.eyebrow{font:10px var(--mono);letter-spacing:1.9px;text-transform:uppercase;color:var(--accent);margin:0 0 20px}.hero{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:35px;padding:7px 0 43px;border-bottom:1px solid var(--line)}h1,h2,h3{font-family:var(--serif);font-weight:400;letter-spacing:-.03em}h1{font-size:clamp(40px,4.8vw,68px);line-height:1.04;margin:0 0 24px;max-width:850px}h1 em{color:var(--accent);font-weight:400}.lead{font-size:16px;line-height:1.8;color:var(--muted);max-width:650px;margin:0 0 25px}.actions{display:flex;flex-wrap:wrap;align-items:center;gap:15px 23px;margin:24px 0}.button{display:inline-flex;align-items:center;justify-content:center;gap:22px;text-decoration:none;background:var(--accent);color:#fff!important;padding:10px 16px;border:1px solid var(--accent);border-radius:2px;font-size:12px}.button:hover{background:#084a91}.button.secondary{background:transparent;color:var(--ink)!important;border-color:#aac6e7}.text-link{font-size:12px;text-decoration:none;border-bottom:1px solid #87add8}.reading-card{background:var(--sage);align-self:stretch;position:relative;padding:25px;overflow:hidden}.reading-card:before{content:'';width:240px;height:240px;border:1px solid #9bbfe9;border-radius:50%;position:absolute;right:-115px;bottom:-110px}.reading-card .shelf-label{font:10px var(--mono);text-transform:uppercase;letter-spacing:1.3px;color:#cee5ff}.reading-card h2{font-size:28px;line-height:1.15;margin:21px 0 14px}.reading-card p{font-size:12px;line-height:1.8;color:#d2e7ff;position:relative}.reading-card a{font:12px var(--sans);position:relative}.section{padding:37px 0;border-bottom:1px solid 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var(--mono);color:var(--muted);margin-top:18px}.feature-strip{display:grid;grid-template-columns:1fr 1fr;background:#cadff7;padding:25px;gap:25px;margin-top:10px}.feature-strip h3{font-size:24px;margin:0 0 10px}.feature-strip p{font-size:12px;color:var(--muted);margin:0 0 15px}.list-row{padding:18px 0;display:grid;grid-template-columns:38px minmax(0,1fr) auto;gap:15px;border-top:1px solid var(--line);align-items:baseline}.row-no{font:11px var(--mono);color:var(--gold)}.list-row h3{font-size:21px;margin:0 0 5px}.list-row p{font-size:12px;margin:0;color:var(--muted);max-width:690px}.list-row a{text-decoration:none}.tag{font:10px var(--mono);letter-spacing:.2px;color:var(--accent);border:1px solid #93b9e3;padding:4px 7px;white-space:nowrap;display:inline-block}.tag.draft{color:#395c96;border-color:#a2b9df}.tag.source{color:var(--muted);border-color:var(--line)}.article-head{border-bottom:1px solid var(--line);padding-bottom:27px;margin-bottom:32px}.article-head 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h2{font-size:25px;margin:8px 0 10px}.catalogue-item p{font-size:13px;max-width:760px;color:var(--muted);margin:0 0 13px}.catalogue-item .item-links{display:flex;gap:22px;flex-wrap:wrap;font-size:12px}.catalogue-item .item-links a{text-decoration:none;border-bottom:1px solid #aac5e5}.catalogue-item[hidden],[hidden]{display:none!important}.data-file{font:11px var(--mono);overflow-wrap:anywhere;max-width:500px}.empty{padding:28px;background:var(--sage);font-size:13px}.result-count{font:11px var(--mono);color:var(--muted)}.footer{border-top:1px solid var(--line);padding:26px 4vw 32px;display:flex;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted)}.footer nav{display:flex;gap:22px;flex-wrap:wrap}.footer a{text-decoration:none}.search-dialog{border:1px solid var(--line);border-radius:4px;background:var(--paper);width:min(720px,calc(100vw - 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var(--mono)}.next-reading{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;border-top:1px solid var(--line);margin-top:42px;padding-top:22px;font-size:13px}.path-step{display:grid;grid-template-columns:34px 1fr;gap:13px;padding:20px 0;border-bottom:1px solid var(--line)}.path-step h3{margin:0 0 8px}.path-step p{margin:0}.path-step .row-no{padding-top:6px}details{border-bottom:1px solid var(--line);padding:15px 0}summary{cursor:pointer;font-size:14px}.checklist label{display:flex;align-items:flex-start;gap:12px;margin:12px 0;font-size:13px}.checklist input{margin-top:6px;accent-color:var(--accent)}.index-note{font:11px var(--mono);color:var(--muted);margin:26px 0 0}.math{font:19px/1.8 var(--serif);background:var(--sage);padding:15px 20px;overflow-x:auto} @media(min-width:1450px){.sidebar{padding-left:42px}}@media(max-width:1150px){.hero{grid-template-columns:1fr 235px}.head-links{gap:15px}.head-links 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6vw;flex-wrap:wrap}.data-table{font-size:11px}}@media(max-width:600px){h1{font-size:46px}.hero{grid-template-columns:1fr;padding-bottom:28px;gap:20px}.reading-card{padding:20px}.reading-card h2{margin:12px 0;font-size:25px}.reading-card p{max-width:340px}.lead{font-size:14px}.main{padding-top:30px}.shelves{gap:0 20px}.shelf h3{font-size:22px}.section-heading h2{font-size:26px}.section-heading{gap:10px;align-items:center}.feature-strip{grid-template-columns:1fr}.brand-name small{font-size:8px}.brand img{width:28px;height:28px}.brand-name{font-size:21px}.site-head{gap:10px}.head-links{gap:8px}.search-open{font-size:11px;padding:8px}.key{display:none}.menu-button{font-size:11px;padding:8px}.list-row{grid-template-columns:27px 1fr}.list-row>.tag{grid-column:2;justify-self:start}.article-head h1{font-size:38px}.filters input{width:100%}.filters label:first-child{flex:1}.lab-grid{grid-template-columns:1fr}.sidebar-inner{grid-template-columns:1fr 1fr}.network{font-size:10px}.network nav{gap:16px}.footer{font-size:10px}.prose table{min-width:430px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}@media print{.network,.sidebar,.head-links,.toc,.search-dialog,.footer,.next-reading{display:none!important}.layout,.article-grid{display:block}.main{padding:20px}.site-head{padding:10px 20px}body{background:white;color:black}pre{white-space:pre-wrap}a{color:inherit}}

/* Blue reading-room layout. This section is part of assets/site.css. */
html{scroll-padding-top:110px;color-scheme:light}
body{-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;background:#dce9f8}
::selection{background:#a8c9f3;color:#0b2853}
:focus-visible{outline-color:#1569ca}
.network{height:34px;padding-inline:5vw;background:#0b2853;color:#c8dcf5;font-size:10px;letter-spacing:.08em}
.network nav{gap:26px}
.network [aria-current]{border-color:#75baff}
.network a:hover{color:#fff}
.site-head{min-height:91px;position:sticky;top:0;z-index:40;padding:19px 5vw;background:#e7f0fc;border-color:#b9cfe7;gap:26px}
.brand{gap:13px;flex-shrink:0}
.brand img{width:35px;height:38px;object-fit:contain}
.brand-name{font:500 27px/1.05 var(--serif);letter-spacing:-.04em;color:#102f59}
.brand-name small{font-size:9px;letter-spacing:.16em;color:#456181;margin-top:7px}
.head-links{gap:24px}
.head-links a{font-size:13px;min-height:44px;display:inline-flex;align-items:center;color:#24496f}
.head-links a:hover{color:#075bb6}
.search-open{background:#d4e4f8;color:#294d75;border-color:#adc7e6;min-height:43px;border-radius:3px;gap:22px}
.search-open:hover{background:#c8ddf5}
.menu-button{min-height:43px;border-color:#adc7e6;color:#173a65;background:#d4e4f8;border-radius:3px}
.layout{max-width:1600px;grid-template-columns:238px minmax(0,1fr)}
.sidebar{background:#d2e2f5;border-color:#b4cce6;padding:34px 24px 55px 3.5vw}
.sidebar-inner{top:117px;max-height:calc(100vh - 145px)}
.nav-group{font-size:10px;color:#365b85;letter-spacing:.13em}
.sidebar a{font-size:13px;padding:8px 10px;color:#35587d;border-radius:0 3px 3px 0;line-height:1.55}
.sidebar a[aria-current]{background:#b4d0f0;color:#0c376d;border-left-color:#1569ca}
.sidebar a:hover{background:#c3d9f2;color:#0c4e9d}
.sidebar .practice{border-color:#adc7e3}
.main{padding:49px clamp(26px,4vw,65px) 75px;background:#e3eefb}
.eyebrow{font-size:10px;color:#185b9f;letter-spacing:.16em}
h1,h2,h3{color:#102f59}
h1{font-size:clamp(40px,4.8vw,65px);font-weight:400;letter-spacing:-.045em}
h1 em{color:#166bc1}
.lead{color:#3e6084;font-size:16px}
.section-intro{color:#3e6084}
.button{background:#105eb8;border-color:#105eb8;border-radius:3px;min-height:44px;font-weight:500;font-size:13px;padding:11px 18px}
.button:hover{background:#08468c;border-color:#08468c}
.button.secondary{color:#16447b!important;border-color:#8fb3dc;background:transparent}
.text-link{color:#174f8b;border-color:#6c9fd1;font-size:13px;padding-block:5px}
.meta{font-size:10px;line-height:1.6;color:#35557a}
.reading-card{background:#1958a0;color:#fff;border-radius:3px;padding:31px;isolation:isolate;min-width:0}
.reading-card:before{inset:0;border:0;border-radius:0;width:auto;height:auto;background:url("knowledge-field.svg") center bottom/cover no-repeat;opacity:.65;z-index:-1}
.reading-card .shelf-label{color:#c1ddff;line-height:1.6}
.reading-card h2{font-size:33px;font-weight:400;color:#fff;line-height:1.15;margin:25px 0 20px}
.reading-card p{font-size:13px;color:#d9eaff;max-width:300px}
.reading-card a{color:#fff;font-size:13px;line-height:1.7}
.section,.shelf,.list-row,.catalogue-item,.article-head,.next-reading,.path-step{border-color:#b7cfe9}
.section-heading{margin-bottom:29px}
.section-heading h2{font-size:34px}
.section-heading a{color:#21598e;font-size:11px;letter-spacing:.02em}
.shelves{gap:0 38px}
.shelf{padding:25px 0 29px}
.shelf .number,.row-no{color:#1268bd}
.shelf .arrow{color:#1268bd;top:23px}
.shelf h3{font-size:27px;margin:16px 0 13px}
.shelf p,.list-row p,.catalogue-item p{font-size:13px;color:#43668b}
.shelf:hover h3{color:#0860b8}
.feature-strip{background:#c9ddf5;border:1px solid #aecae9;border-radius:3px;padding:30px;gap:40px}
.feature-strip h3{font-size:28px}
.feature-strip p{color:#3c5f84;font-size:13px}
.list-row{padding-block:23px}
.list-row h3{font-size:25px}
.tag{border-radius:2px;background:#d5e7fb;color:#175ba5;border-color:#8eb3df}
.tag.source{background:#e7f0fb;color:#476889;border-color:#b3cde7}
.tag.draft{background:#e2eafa;color:#3e5590;border-color:#a4b5d9}
.article-head h1{max-width:900px}
.article-grid{grid-template-columns:minmax(0,780px) 155px;gap:40px}
.article-head{padding-bottom:30px;margin-bottom:37px}
.prose{font-size:15px;color:#183c64;line-height:1.85}
.prose h2{font-size:30px;margin-top:42px;color:#102f59}
.prose h3{color:#153f70}
.prose a{color:#105aa5;text-decoration-color:#75a6d8}
.prose code{background:#cbdff7;color:#103f77}
pre{background:#0d2c56;color:#e0efff;border:1px solid #244c7e}
.callout,.lab,.empty{background:#c8ddf6;border-color:#2777cc;color:#183f70}
.math{background:#c9def7;color:#173d6a}
.toc{border-color:#abc7e7}
.toc span,.toc a{color:#496c94}
.prose th,.data-table th{color:#436387}
.prose td,.prose th,.data-table td,.data-table th{border-color:#b6cee8}
input,select{background:#eff6ff;color:#143862;border-color:#9cbde2;min-height:43px}
.filters label{font-size:12px;color:#3e628b}
.result-count,.index-note{color:#35557a}
.search-dialog{background:#e5effc;color:#13365f;border-color:#91b5df}
.search-dialog::backdrop{background:#0b2853bb}
.search-result:hover,.search-result:focus{background:#c7dcf5}
.search-result strong{color:#164779}
.search-result small{color:#426488}
.footer{background:#0b2853;color:#c7dcf4;border-color:#173f70;padding:32px 5vw;font-size:11px}
.footer a:hover{color:#fff}
/* The front door has the breathing room of the company site.
   Reading pages retain the topic sidebar and compact reference layout. */
.home-layout{display:block;max-width:none}
.home-layout>.sidebar{display:none}
.home-layout>.main{padding:0;background:#dce9f8}
.home-layout .hero{max-width:none;position:relative;isolation:isolate;padding:76px max(5vw,calc((100vw - 1320px)/2)) 72px;margin:0;grid-template-columns:minmax(0,1fr) 335px;gap:7vw;background:linear-gradient(112deg,#dce9f8 0%,#d3e4f9 53%,#bdd8f7 100%);border-color:#a9c8eb}
.home-layout .hero:before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(ellipse at 66% 40%,#a9cef655,transparent 65%)}
.home-layout .hero h1{font-size:clamp(50px,5.6vw,79px);max-width:800px;line-height:1.05;margin-bottom:27px;letter-spacing:-.045em}
.home-layout .hero h1 em{font-style:normal}
.home-layout .hero .lead{max-width:640px;font-size:17px;line-height:1.8}
.home-layout .hero .eyebrow{margin-bottom:28px}
.home-layout .hero .actions{margin-top:31px;gap:25px}
.home-layout .hero .meta{margin-top:29px;gap:12px 24px}
.home-layout .reading-card{align-self:stretch;min-height:346px}
.home-layout .main>.section{padding:53px max(5vw,calc((100vw - 1320px)/2));margin:0}
.home-layout .main>.section:nth-of-type(3){background:#cdddF3}
.home-layout .main>.section:last-child{padding-bottom:72px}
@media(min-width:1550px){.sidebar{padding-left:40px}}
@media(max-width:1200px){.site-head{padding-inline:4vw;gap:18px}.head-links{gap:17px}.brand-name{font-size:25px}.head-links a.optional{display:none}.article-grid{grid-template-columns:1fr}.toc{display:none}.home-layout .hero{gap:4vw;grid-template-columns:minmax(0,1fr) 300px}.home-layout .hero h1{font-size:65px}}
@media(max-width:1000px){.layout{grid-template-columns:212px minmax(0,1fr)}.sidebar{padding-left:25px}.main{padding:39px 30px}.home-layout .hero h1{font-size:58px}.home-layout .hero{padding-top:60px;padding-bottom:60px}.home-layout .reading-card h2{font-size:29px}.brand-name small{font-size:8px}}
@media(max-width:850px){.site-head{min-height:83px;padding:17px 6vw;flex-wrap:wrap}.brand-name{font-size:24px}.head-links{gap:12px}.head-links>a{display:none}.layout{display:block}.sidebar{display:none;padding:24px 6vw;background:#cfdff3}.sidebar.is-open{display:block}.sidebar-inner{position:static;max-height:none}.sidebar a{font-size:13px}.main{padding:34px 6vw 55px}.menu-button{display:inline-block}.network{padding-inline:6vw}.network-label{display:none}.network{justify-content:center}.home-layout>.sidebar.is-open{display:block}.home-layout .hero{grid-template-columns:1fr 270px;gap:28px;padding:47px 6vw}.home-layout .hero h1{font-size:49px}.home-layout .hero .lead{font-size:15px}.home-layout .reading-card{padding:24px}.home-layout .reading-card h2{font-size:28px}.home-layout .main>.section{padding:42px 6vw}.shelves{gap:0 28px}.footer{padding-inline:6vw}}
@media(max-width:650px){.home-layout .hero{grid-template-columns:1fr;gap:33px;padding-top:42px}.home-layout .hero h1{font-size:clamp(43px,9.7vw,61px)}.home-layout .hero .lead{font-size:15px}.home-layout .reading-card{min-height:0;padding:26px}.home-layout .reading-card h2{font-size:29px;margin:17px 0 12px}.home-layout .reading-card p{max-width:440px}.home-layout .hero .meta{margin-top:23px;gap:9px 20px}.home-layout .main>.section{padding-block:37px}.section-heading h2{font-size:29px}.section-heading a{font-size:10px}.shelf h3{font-size:25px}.feature-strip{padding:24px;gap:25px}.brand img{width:29px;height:33px}.head-links{margin-left:auto}.search-open{font-size:11px;gap:12px;padding:8px 10px}.brand-name{font-size:23px}.site-head{gap:14px;min-height:101px}.head-links a{display:none}.list-row h3{font-size:23px}.article-head h1{font-size:39px}.article-head .lead{font-size:15px}.prose{font-size:15px}.prose h2{font-size:27px}.footer{gap:20px}.meta{font-size:10px}.network nav{gap:24px}}
@media print{body,.main,.home-layout>.main{background:#fff!important;color:#111!important}.site-head{position:static}.home-layout .hero{padding:20px;background:#fff}.home-layout .reading-card{background:#edf4fc;color:#13365f}.home-layout .reading-card h2,.home-layout .reading-card p,.home-layout .reading-card a{color:#13365f}}