/* Projectkey: the learning folder. Original theme, November 2026. */
@font-face{font-family:"Projectkey Display";src:url('/assets/projectkey-display.woff2') format('woff2');font-weight:200 1000;font-style:normal;font-display:swap}
:root{--paper:#fffdf5;--ink:#17140f;--violet:#7014f5;--lilac:#e6d6ff;--navy:#7014f5;--muted:#575348;--rule:#d7d0bd;--white:#fffdf5;--folder:#ebc45e;--coral:#f78069;--serif:Arial,Helvetica,sans-serif;--sans:Arial,Helvetica,sans-serif}
html{scroll-padding-top:24px}body{background:var(--violet);color:var(--ink);line-height:1.7}
a{color:#5410c4}a:hover{color:#36106b}a:focus-visible,button:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid currentColor;outline-offset:5px}
h1,h2,h3{color:var(--ink)}h1,h2{font-family:"Projectkey Display",Arial,sans-serif;font-weight:400;letter-spacing:-.045em}
.site-header{max-width:1320px;padding:22px 36px 0;color:var(--white)}
.masthead{gap:24px;padding-bottom:18px}.brand{color:var(--white);font-size:25px;letter-spacing:-.045em}.brand:hover{color:var(--white)}
.brand-mark{background:var(--folder);color:var(--ink);font-family:"Projectkey Display",Arial,sans-serif;font-size:38px;width:46px;height:46px;border:2px solid var(--ink);border-radius:50%;transform:rotate(-8deg);padding-bottom:4px}
.brand small{color:var(--white);font-size:11px;letter-spacing:.01em}.edition{color:var(--white);font-size:12px}.languages{margin-left:auto;font-size:13px;gap:8px}.languages a{color:var(--white);padding:5px 10px;border:1px solid transparent;border-radius:20px}.languages a[aria-current]{border-color:var(--white);color:var(--white);font-weight:400}
.main-nav{border:0;padding:0;gap:8px;flex-wrap:wrap;font-size:13px}.main-nav a{color:var(--white);border:1px solid #ffffff80;border-radius:20px;padding:6px 13px;white-space:normal;line-height:1.4}.main-nav a:hover,.main-nav a[aria-current]{background:var(--white);color:var(--ink);text-decoration:none}
.home .main-nav{display:none}.home main{background:var(--violet)}
.playground-hero{position:relative;max-width:1320px;margin:auto;padding:154px 36px 52px;isolation:isolate}
.poster-type{position:absolute;z-index:-1;top:0;left:30px;right:30px;font-family:"Projectkey Display",Arial,sans-serif;font-size:clamp(70px,12.6vw,176px);line-height:1.08;letter-spacing:-.075em;white-space:nowrap;text-align:center;color:var(--white);overflow:clip}
.folder{position:relative;border:2px solid var(--ink);border-radius:0 16px 20px 20px;background:var(--folder)}
.folder-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));position:relative;margin:-40px -2px 0;gap:0;padding-right:0}
.folder-tabs a{min-width:0;position:relative;display:flex;justify-content:center;align-items:center;gap:8px;text-decoration:none;color:var(--ink);background:var(--folder);border:2px solid var(--ink);border-bottom:0;border-radius:22px 22px 0 0;padding:12px 10px 14px;font-size:14px;font-weight:700;line-height:1.3;text-align:center}
.folder-tabs a:nth-child(2){background:var(--coral)}.folder-tabs a:nth-child(3){background:#c7a4ff}.folder-tabs a:nth-child(4){background:#d5d0ae}.folder-tabs a:hover{text-decoration:underline;text-underline-offset:4px}.folder-tabs a:first-child{z-index:2}.tab-eyes{font-size:22px;letter-spacing:-8px;margin-right:4px;line-height:1}
.folder-sheet{position:relative;padding:38px 52px 34px;border-radius:0 13px 17px 17px;background:var(--folder);min-height:450px}
.folder-title{font-size:clamp(70px,10.7vw,145px);line-height:1.05;letter-spacing:-.075em;margin:0;text-align:center;text-wrap:nowrap}
.folder-inside{display:grid;grid-template-columns:1.15fr 1fr;align-items:center;gap:30px;max-width:970px;margin:20px auto 0}
.folder-copy{max-width:470px}.folder-copy h2{font-size:clamp(26px,2.65vw,38px);line-height:1.12;letter-spacing:-.045em;margin:0 0 14px}
.folder-copy p{font-size:15px;line-height:1.6;max-width:48ch}.folder-copy .hero-actions{margin-top:24px;gap:12px}.folder-copy .hero-note{margin-top:17px;font-size:12px;line-height:1.5;color:var(--ink);max-width:43ch}
.folder-mascot{position:relative;align-self:center;margin:-12px -20px -22px 0;transform:rotate(3deg)}.folder-mascot img{width:100%;height:auto;max-height:280px;object-fit:contain}
.button,.pill-link{background:var(--ink);color:var(--white);border:2px solid var(--ink);border-radius:40px;box-shadow:none;font-size:13px;line-height:1.3;padding:12px 22px;font-weight:600;gap:10px}.button:hover,.pill-link:hover{background:var(--white);color:var(--ink)}.button-outline{background:transparent;color:var(--ink);border-color:var(--ink);padding:12px 0;border:0;border-radius:0;text-decoration:underline;text-underline-offset:4px}.button-outline:hover{background:transparent;color:var(--ink)}
.folder-bottom{display:flex;justify-content:space-between;gap:16px;align-items:center;border-top:1px solid #17140f50;padding-top:18px;margin-top:24px;font-size:11px;line-height:1.4}.folder-bottom span:last-child{text-align:right}
.home-content{background:var(--paper);border-radius:28px 28px 0 0;border-top:2px solid var(--ink)}.home-content-inner{max-width:1200px;padding:60px 36px 64px;margin:auto}
.desk-introduction{grid-template-columns:190px 1fr 280px;gap:30px}.books-figure{background:var(--lilac);border:2px solid var(--ink);border-radius:14px;padding:10px 10px 14px;transform:rotate(-3deg)}.books-figure img{filter:none}.books-figure span{color:var(--ink);font-size:11px}.desk-copy h2{font-size:27px}.desk-copy p:not(.section-kicker){color:var(--muted);font-size:14px}.section-kicker{font-size:12px;color:#5410c4;font-weight:600;letter-spacing:0}.historical-facts>p{color:var(--muted);font-size:11px}
.facts-grid{gap:8px}.fact{border:1px solid var(--ink);border-radius:9px;background:var(--folder);padding:15px 12px;min-height:104px}.fact strong,.fact-1 strong,.fact-2 strong,.fact-3 strong{color:var(--ink);font-family:"Projectkey Display",Arial,sans-serif;font-size:28px;font-weight:400}.fact span{color:var(--ink);font-size:11px}.fact svg,.fact-1 svg,.fact-2 svg,.fact-3 svg{color:var(--ink);width:19px;height:19px}.fact-1{background:#e6d6ff}.fact-2{background:#f9c1ad}.fact-3{background:#e5e7c9}
.topic-section,.featured-section,.process-section,.latest-section{margin-top:64px}.section-heading h2{font-size:31px;line-height:1.2}.section-heading.centered{text-align:left}.topic-index{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.topic{flex-direction:row;align-items:center;justify-content:start;text-align:left;gap:12px;padding:16px 12px;border:1px solid var(--ink);border-radius:9px;background:var(--paper);box-shadow:none}.topic span{font-size:13px;line-height:1.4;color:var(--ink);max-width:none}.topic svg,.topic:nth-child(2n) svg,.topic:nth-child(3n) svg{background:var(--folder);color:var(--ink);flex-shrink:0;border:1px solid var(--ink);border-radius:50%;padding:9px;width:40px;height:40px}.topic:nth-child(2n) svg{background:var(--lilac)}.topic:nth-child(3n) svg{background:var(--coral)}.topic:hover{background:#f3eddc}
.resource-cards{gap:20px}.resource-card{border:1px solid var(--ink);border-radius:12px;background:#fff;box-shadow:none}.resource-art{margin:0;border-radius:0;border-bottom:1px solid var(--ink)}.resource-art img{transition:none}.resource-art:hover img{transform:none}.resource-copy{padding:22px}.resource-copy h3{font-size:21px;line-height:1.3;letter-spacing:-.025em}.resource-copy h3 a{color:var(--ink)}.resource-tag{color:#5410c4;font-size:11px}.resource-copy>p:not(.resource-tag){font-size:14px;color:var(--muted)}.resource-open{color:var(--ink);font-size:12px}
.process-section{gap:22px;grid-template-columns:1.05fr 1fr}.practice-card,.timeline-card{border:1px solid var(--ink);border-radius:12px;padding:28px;background:var(--lilac);box-shadow:none}.timeline-card{background:var(--folder)}.practice-card h2,.timeline-card h2{font-size:28px;line-height:1.2}.practice-card p:not(.section-kicker){color:var(--ink);font-size:14px}.timeline-card .section-kicker{color:var(--ink)}.timeline li{border-color:var(--ink)}.timeline li>span{color:var(--ink)}.timeline h3 a{color:var(--ink)}.timeline p{color:var(--muted)}
.guide-cards{gap:18px}.guide-cards article{background:var(--paper);border:0;border-top:2px solid var(--ink);border-radius:0;box-shadow:none;padding:22px 0}.guide-icon{background:var(--folder);color:var(--ink);border:1px solid var(--ink);border-radius:50%;width:44px;height:44px}.guide-cards h3 a{color:var(--ink)}.guide-cards article>div>p:not(.resource-tag){color:var(--muted);font-size:14px}.edition-date{font-size:12px;color:var(--muted)}.text-link{color:var(--ink)}
.site-footer{background:var(--violet);color:var(--white);border-top:2px solid var(--ink)}.contact-panel{max-width:1200px;padding:48px 36px 36px;gap:64px}.contact-panel h2{font-size:34px;color:var(--white);line-height:1.15}.contact-panel p:not(.section-kicker){color:var(--white);font-size:14px}.site-footer .section-kicker{color:var(--white)}.contact-button{background:var(--folder);color:var(--ink)}.contact-note{background:transparent;border:1px solid #ffffff80;border-radius:12px;padding:24px}.contact-note h3,.contact-note>svg{color:var(--white)}.contact-note a{color:var(--white)}.footer-bottom{max-width:1128px;border-top:1px solid #ffffff80;padding:22px 0}.footer-bottom p,.footer-bottom nav a{color:var(--white)}
.record main,.guide main,.about main{background:var(--paper);border-top:2px solid var(--ink);border-radius:24px 24px 0 0;margin-top:28px}.article-head{max-width:1128px;padding:32px 0 40px}.article-head h1{font-size:clamp(32px,4.4vw,58px);line-height:1.12;max-width:20ch}.article-head .intro{color:var(--muted);font-size:18px;max-width:65ch}.breadcrumb{color:var(--muted)}.reading-layout{max-width:1128px;grid-template-columns:230px minmax(0,760px);gap:56px}.reading-rail{background:var(--folder);border:1px solid var(--ink);border-radius:8px}.reading-rail nav{border-color:var(--ink)}.reading-rail a{color:var(--ink)}.rail-note{color:var(--ink);border-color:#17140f50}.rail-note span{color:var(--muted)}.article-content h2{font-size:30px;line-height:1.2}.article-content h3{color:var(--ink)}.article-content p,.checks li{color:var(--ink)}.article-diagram img{border-radius:12px;border:1px solid var(--ink)}.worksheet{background:#f8f1dc;border:1px solid var(--ink);border-radius:10px;box-shadow:none}.worksheet textarea{background:#fff;border-color:#6a6250;color:var(--ink)}.print-button{background:var(--ink);color:var(--white);border-radius:30px;border:2px solid var(--ink);box-shadow:none}.source-list>li{border-color:var(--rule);border-radius:8px}.file-reference{background:var(--lilac);border:1px solid var(--rule);border-radius:8px}.related{border-color:var(--ink)}
.not-found,.not-found h1,.not-found h2,.not-found p,.not-found a{color:var(--white)}
@media(min-width:1500px){.site-header{max-width:1320px}.home-content-inner,.contact-panel{max-width:1200px}.article-head,.reading-layout,.footer-bottom{max-width:1128px}}
@media(max-width:1200px){.desk-introduction{grid-template-columns:160px 1fr;gap:25px}.historical-facts{grid-column:1/-1}.facts-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.home-content-inner{margin:0}.article-head,.reading-layout{margin-left:36px;margin-right:36px}.contact-panel{margin:0}.footer-bottom{margin:0 36px}.edition{display:none}.folder-sheet{padding:32px 38px}.folder-inside{gap:20px}.folder-mascot{margin-right:-16px}.playground-hero{padding-top:140px}.poster-type{font-size:12.5vw}}
@media(max-width:800px){.site-header{padding:18px 20px 0}.masthead{gap:10px;padding-bottom:16px}.brand{font-size:21px;gap:9px}.brand-mark{width:40px;height:40px;font-size:31px}.brand small{font-size:10px}.languages{gap:2px;font-size:11px}.languages a{padding:5px 7px}.main-nav{gap:6px;font-size:11px}.main-nav a{padding:6px 9px}.playground-hero{padding:92px 20px 32px}.poster-type{left:10px;right:10px;top:2px;font-size:12.2vw;letter-spacing:-.075em}.folder-tabs{margin-top:-34px}.folder-tabs a{padding:10px 5px 12px;font-size:10px;border-radius:15px 15px 0 0;gap:3px;min-height:46px}.tab-eyes{display:none}.folder-sheet{padding:25px 22px 24px;min-height:0}.folder-title{font-size:clamp(46px,11vw,87px);letter-spacing:-.075em}.folder-inside{grid-template-columns:1fr;gap:20px;margin-top:24px}.folder-copy{max-width:100%}.folder-copy h2{font-size:29px;max-width:16ch}.folder-copy p{font-size:14px;line-height:1.6}.folder-copy .hero-actions{margin-top:20px;gap:10px}.folder-copy .hero-note{font-size:11px;margin-top:15px;max-width:100%}.folder-mascot{margin:0;max-width:320px;justify-self:center;transform:rotate(2deg)}.folder-mascot img{max-height:215px}.folder-bottom{margin-top:18px;padding-top:14px;font-size:10px;align-items:start}.folder-bottom span:last-child{max-width:16ch}.button,.pill-link{padding:11px 16px;font-size:12px}.button-outline{padding:10px 0;font-size:12px}.home-content{border-radius:22px 22px 0 0}.home-content-inner{padding:34px 20px 42px}.desk-introduction{grid-template-columns:1fr;gap:24px}.books-figure{max-width:220px;padding:10px}.historical-facts{grid-column:auto}.facts-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.fact{min-height:98px}.desk-copy h2{font-size:28px}.desk-copy p:not(.section-kicker){font-size:14px}.section-kicker{font-size:11px}.section-heading h2{font-size:27px;line-height:1.2}.section-heading{gap:12px}.topic-section,.featured-section,.process-section,.latest-section{margin-top:42px}.topic-index{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.topic{padding:12px 8px;gap:8px;border-radius:8px}.topic span{font-size:11px}.topic svg,.topic:nth-child(2n) svg,.topic:nth-child(3n) svg{width:32px;height:32px;padding:7px}.resource-cards{grid-template-columns:1fr;gap:18px}.resource-copy{padding:20px}.resource-copy h3{font-size:22px}.resource-copy>p:not(.resource-tag){font-size:14px}.process-section{grid-template-columns:1fr;gap:18px}.practice-card,.timeline-card{padding:24px}.practice-card h2,.timeline-card h2{font-size:26px}.guide-cards{grid-template-columns:1fr;gap:0}.guide-cards article{padding:23px 0;display:flex;gap:14px}.guide-icon{width:42px;height:42px}.guide-cards h3{font-size:19px}.guide-cards article>div>p:not(.resource-tag){font-size:14px}.edition-date{font-size:10px;max-width:9ch}.contact-panel{padding:36px 20px 28px;gap:26px;grid-template-columns:1fr;margin:0}.contact-panel h2{font-size:29px}.contact-panel p:not(.section-kicker){font-size:14px}.contact-note{padding:21px}.footer-bottom{margin:0 20px;padding:24px 0}.footer-bottom nav{flex-wrap:wrap;gap:16px}.record main,.guide main,.about main{margin-top:22px}.article-head{margin:0 20px;padding:25px 0 30px}.article-head h1{font-size:clamp(31px,8.2vw,45px)}.article-head .intro{font-size:17px;line-height:1.65}.reading-layout{margin:0 20px;gap:28px;padding:24px 0 38px}.reading-rail{padding:18px}.article-content h2{font-size:27px}.article-content p,.checks li{font-size:16px;line-height:1.8}.worksheet{padding:18px}.article-diagram img{border-radius:8px}.not-found{padding:20px}}
@media(max-width:380px){.site-header{padding-left:15px;padding-right:15px}.playground-hero{padding-left:15px;padding-right:15px}.folder-sheet{padding-left:17px;padding-right:17px}.folder-title{font-size:11vw}.folder-tabs a{font-size:9px}.folder-copy h2{font-size:27px}.folder-copy .hero-actions{gap:6px}.folder-copy .button{padding:10px 13px}.folder-copy .button-outline{padding-left:0;padding-right:0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{body{background:#fff;color:#000}.record main,.guide main,.about main{border:0;background:#fff;margin:0}.article-head,.reading-layout{margin:0;padding:0}.article-head h1{font-size:26pt}.article-content h2{font-size:20pt}.playground-hero{padding:0}.poster-type,.folder-tabs,.folder-mascot,.folder-bottom,.hero-actions{display:none}.folder,.folder-sheet{border:0;background:#fff;padding:0}.folder-title{text-align:left;font-size:30pt}.folder-inside{display:block}.worksheet{background:#fff}.print-value{color:#000;background:#fff}}

/* Typography revision: softer Nunito Sans throughout; the folder layout is unchanged. */
:root{--sans:"Projectkey Display",Arial,Helvetica,sans-serif;--serif:"Projectkey Display",Arial,Helvetica,sans-serif}
body{font-weight:450}h1,h2{font-weight:800;letter-spacing:-.035em}h3{font-weight:750}
.poster-type{font-weight:850;letter-spacing:-.065em}.folder-title{font-weight:900;letter-spacing:-.06em}.folder-copy h2{font-weight:800;letter-spacing:-.035em}
.fact strong,.fact-1 strong,.fact-2 strong,.fact-3 strong{font-weight:800}.brand-mark{font-weight:900}.section-heading h2{font-weight:800}