:root{color-scheme:light;--canvas:#f0f3f8;--surface:#fff;--surface-alt:#e5eaf3;--ink:#17263b;--muted:#526176;--line:#b8c4d4;--action:#2448b5;--action-ink:#fff;--marker:#d5ed5b;--marker-ink:#17263b;--focus:#b13c00;--radius:3px;--space:24px;--reading:68ch;font-family:Arial,Helvetica,sans-serif;font-size:16px;background:var(--canvas);color:var(--ink)}
:root[data-theme=dark]{color-scheme:dark;--canvas:#101722;--surface:#182332;--surface-alt:#233247;--ink:#eff4fc;--muted:#b4c3d9;--line:#536780;--action:#adc4ff;--action-ink:#101722;--marker:#d5ed5b;--focus:#ffbb8d}
*{box-sizing:border-box}body{margin:0}a{color:var(--action);text-underline-offset:4px}button,input,select{font:inherit}button,select{cursor:pointer}img{max-width:100%;height:auto}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2.2rem,4.5vw,4.6rem);line-height:1.08;letter-spacing:-.045em;max-width:20ch;overflow-wrap:anywhere}h2{font-size:clamp(1.6rem,2.5vw,2.6rem);line-height:1.15;letter-spacing:-.03em}h3{font-size:1.2rem;line-height:1.3}p{line-height:1.65}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--focus);outline-offset:5px}a:hover{text-decoration-thickness:2px}.skip{position:absolute;left:12px;top:-80px;background:var(--surface);padding:16px;z-index:20}.skip:focus{top:12px}.shell{max-width:1440px;margin:auto;display:flex;align-items:center;gap:40px;padding:26px 48px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-size:1.25rem;font-weight:800;line-height:1}.brand-sub{display:block;font-size:.6rem;letter-spacing:.22em;margin-top:7px}.shell nav{display:flex;gap:28px;margin-left:auto}.shell nav a{color:var(--ink);text-decoration:none}select,input{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);color:var(--ink);padding:12px;min-height:44px}main{max-width:1440px;margin:auto;padding:0 48px 72px}main>section{margin-top:80px}main>section>p,main>p{max-width:68ch}.eyebrow{font-size:.72rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:20px}.hero{display:grid;grid-template-columns:1fr 1.1fr;gap:70px;align-items:center;padding-top:20px}.hero h1 span{color:var(--action)}.lead{font-size:1.17rem;max-width:58ch;color:var(--muted);line-height:1.65}.button{display:inline-flex;gap:32px;justify-content:space-between;align-items:center;background:var(--action);color:var(--action-ink);border:1px solid var(--action);border-radius:var(--radius);padding:16px 22px;text-decoration:none;font-weight:700;min-height:48px}.button:hover{filter:brightness(.92)}.button:disabled{background:var(--surface-alt);color:var(--muted);border-color:var(--line);cursor:not-allowed}.secondary{background:transparent;color:var(--action)}.text-link{display:block;margin-top:24px;font-size:.9rem}.slide-stage{position:relative;border:1px solid var(--line);background:var(--surface);box-shadow:12px 12px 0 var(--surface-alt)}.stage-bar,.stage-caption{display:flex;justify-content:space-between;padding:14px 18px;font-size:.68rem;font-weight:700;letter-spacing:.06em}.stage-bar{border-bottom:1px solid var(--line);color:var(--muted)}.slide-stage>img{display:block;aspect-ratio:16/10;object-fit:contain;width:100%;background:var(--surface-alt);padding:24px}.stage-caption{border-top:1px solid var(--line);font-size:.8rem}.layout-hints{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);font-size:.65rem;color:var(--muted)}.layout-hints span{padding:14px 8px;text-align:center;border-right:1px solid var(--line)}.editorial{padding:32px 0;border-top:2px solid var(--ink);border-bottom:1px solid var(--line)}.task-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.task-grid>a{padding:20px 0;color:var(--ink);text-decoration:none;border-top:1px solid var(--line)}.task-grid b{display:block;font-size:1.3rem;margin-bottom:14px}.task-grid span{font-size:.85rem;color:var(--muted)}.task-grid a:hover b{color:var(--action)}.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:30px}.section-head h2{margin-bottom:0}.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:42px 24px}.template-card{min-width:0}.preview{display:block;position:relative;aspect-ratio:4/3;background:var(--surface-alt);border:1px solid var(--line);padding:12px}.preview img{width:100%;height:100%;object-fit:contain;display:block}.slide-index{position:absolute;left:12px;top:12px;background:var(--surface);color:var(--muted);font-size:.58rem;padding:4px 6px;z-index:1;font-variant-numeric:tabular-nums}.card-meta{display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:.64rem;margin:14px 0 8px}.template-card h3{margin-bottom:8px}.template-card h3 a{color:var(--ink);text-decoration:none}.template-card p{font-size:.86rem;line-height:1.6;color:var(--muted);margin:0}.reading-band{display:grid;grid-template-columns:1fr 1fr;gap:70px;background:var(--surface);padding:40px;border-top:4px solid var(--marker)}.guide-row{display:block;padding:22px 0;border-top:1px solid var(--line);text-decoration:none;color:var(--ink)}.guide-row span{font-size:.7rem;color:var(--muted)}.guide-row h3{margin:10px 0 0}.intro,.page-intro{padding:64px 0 30px;max-width:1000px}.intro h1,.page-intro h1{font-size:clamp(2rem,4vw,3.6rem);max-width:26ch}.filters{display:flex;gap:20px;align-items:end;padding:24px;background:var(--surface);border:1px solid var(--line)}.filters label{display:grid;gap:8px;font-size:.8rem;flex:1}.filters .button{min-height:46px;padding:12px 24px}#result-count{font-size:.8rem;color:var(--muted);margin:24px 0}.notice,.exercise{background:var(--surface-alt);padding:28px;border-left:4px solid var(--action)}[hidden]{display:none!important}.article-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:64px;align-items:start}.toc{display:grid;gap:18px;position:sticky;top:24px;border-top:3px solid var(--marker);padding-top:22px;font-size:.85rem}.toc a{color:var(--muted)}.prose{max-width:var(--reading);font-size:1.1rem;line-height:1.75}.prose h2{font-size:1.7rem;margin-top:2em;scroll-margin-top:30px}.prose h2:first-child{margin-top:0}.prose li{margin-bottom:12px}.prose figure{margin:32px 0}.prose figcaption{font-size:.8rem;color:var(--muted)}.table-wrap{overflow-x:auto;max-width:100%}table{border-collapse:collapse;width:100%;font-size:.9rem}td,th{border:1px solid var(--line);padding:12px;text-align:left}th{background:var(--surface-alt)}caption{text-align:left;padding:12px 0;color:var(--muted)}.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:48px}.detail-layout>section{min-width:0}.detail-layout h2{font-size:1.7rem;margin-top:36px}.detail-layout p,.detail-layout li{max-width:68ch;line-height:1.7}.large-preview{display:block;width:100%;max-height:620px;object-fit:contain;background:var(--surface);border:1px solid var(--line);padding:24px}.detail-layout aside{background:var(--surface);border-top:4px solid var(--marker);padding:24px;height:fit-content}.detail-layout aside h2{margin-top:0;font-size:1.2rem}.original-file-summary{background:var(--surface-alt);padding:16px}.gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.gallery figure{margin:0}.gallery img{width:100%;display:block;border:1px solid var(--line)}.gallery figcaption{font-size:.75rem;color:var(--muted);padding-top:10px}footer{border-top:1px solid var(--line);padding:40px 48px;max-width:1440px;margin:auto}.footer-title{font-size:1.6rem;font-weight:700;margin-bottom:26px;max-width:30ch}footer nav{display:flex;gap:24px;flex-wrap:wrap;font-size:.85rem}footer p{font-size:.75rem;color:var(--muted);margin:24px 0 0}.kit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.swatch{padding:24px;background:var(--surface);border:1px solid var(--line)}.kit-table{margin:30px 0}.kit-table td{vertical-align:top}code{font-size:.85em}.source-note,.muted{color:var(--muted);font-size:.85rem}.back{display:inline-block;margin-bottom:24px}
@media(max-width:1000px){.shell{gap:20px;padding:22px 28px;flex-wrap:wrap}.shell nav{margin-left:auto}.hero{gap:32px}.cards{grid-template-columns:repeat(3,minmax(0,1fr))}.reading-band{gap:32px;padding:28px}.detail-layout{grid-template-columns:minmax(0,1fr) 280px}main{padding-left:28px;padding-right:28px}.article-layout{grid-template-columns:180px minmax(0,1fr);gap:30px}}
@media(max-width:700px){.shell{padding:18px 20px;gap:20px}.brand{font-size:1.05rem}.brand img{width:34px;height:34px}.shell nav{order:3;width:100%;justify-content:space-between;font-size:.88rem}.hero{grid-template-columns:1fr;gap:32px;padding-top:0}.hero h1{font-size:2.8rem}.hero .lead{font-size:1rem}.slide-stage{box-shadow:6px 6px 0 var(--surface-alt)}main{padding:0 20px 48px}main>section{margin-top:48px}.cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:30px 16px}.task-grid,.reading-band{grid-template-columns:1fr;gap:12px}.task-grid>a{padding:18px 0}.section-head{align-items:start}.section-head>a{font-size:.8rem;white-space:nowrap}.template-card h3{font-size:1rem}.card-meta{font-size:.6rem;flex-wrap:wrap}.template-card p{font-size:.8rem}.preview{padding:7px}.slide-index{left:7px;top:7px}.intro,.page-intro{padding-top:38px}.filters{flex-direction:column;align-items:stretch;padding:18px}.article-layout,.detail-layout{grid-template-columns:1fr;gap:28px}.toc{position:static;gap:12px}.prose{font-size:1rem;min-width:0}.gallery{grid-template-columns:repeat(2,minmax(0,1fr))}.kit-grid{grid-template-columns:1fr}.kit-table{overflow-x:auto}.kit-table table{min-width:660px}footer{padding:32px 20px}.reading-band{padding:24px}.stage-bar{font-size:.6rem}.stage-caption{font-size:.7rem}.layout-hints{font-size:.57rem}}
@media(max-width:360px){.cards{grid-template-columns:1fr}.hero h1{font-size:2.45rem}.shell{padding-left:16px;padding-right:16px}main{padding-left:16px;padding-right:16px}.brand{gap:8px}.brand img{width:28px;height:28px}.gallery{grid-template-columns:1fr}}

.color-inputs{display:flex;gap:24px;flex-wrap:wrap}.color-inputs label{display:grid;gap:12px}input[type=color]{width:100px;height:54px;padding:4px}#contrast-preview{padding:24px;margin:28px 0;border:1px solid var(--line)}.edited-section{margin-top:64px;border-top:2px solid var(--line);padding-top:32px}.edited-section>p{max-width:68ch}.edited-section .notice{margin-top:24px}main>.prose{padding-top:48px}.action-row{display:flex;gap:16px;flex-wrap:wrap}.specimen-fields{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:32px 0}.specimen-fields label{display:grid;gap:10px;font-size:.85rem}.specimen-fields input{width:100%}.state-specimens>.notice{margin:32px 0}.source-disclosure{margin-top:64px;padding-top:24px;border-top:1px solid var(--line);max-width:68ch}.source-disclosure h2{font-size:1.6rem}.source-disclosure dt{color:var(--muted);font-size:.8rem;margin-top:18px}.source-disclosure dd{margin:6px 0;overflow-wrap:anywhere}.source-disclosure p{margin-top:24px}.intro+p:has(.button){display:flex;flex-wrap:wrap;gap:16px}@media(max-width:700px){.specimen-fields{grid-template-columns:1fr}main>.prose{padding-top:32px}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.theme-control{display:flex;align-items:center;justify-content:center;gap:6px;min-height:44px;margin:0 0 0 8px;padding:0 4px;border:0;border-radius:4px;background:transparent;color:var(--ink);cursor:pointer}.theme-label{font-size:.75rem;white-space:nowrap}.theme-control:hover{background:var(--surface-alt)}.theme-control:focus-visible{outline:3px solid var(--focus);outline-offset:3px}.theme-icon{display:none}:root[data-preference=system] .theme-icon[data-icon=system],:root[data-preference=light] .theme-icon[data-icon=light],:root[data-preference=dark] .theme-icon[data-icon=dark]{display:block}@media(max-width:700px){.theme-control{margin-left:auto}}
/* Product compositions consume the same primitives as the visible kit. */
select,input{border-color:var(--control-line)}.template-grid,.layout-grid,.guide-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:42px 24px}.catalog-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:36px}.topic-nav{display:grid;align-content:start;gap:16px;padding-top:24px}.topic-nav h2{font-size:1rem;margin-bottom:0}.topic-nav a{font-size:.86rem}.fine,.kicker{color:var(--muted);font-size:.83rem}.quiet-link{display:inline-block;margin:18px 0}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:28px}.source-body{white-space:pre-line;overflow-wrap:anywhere}.source-disclosure summary{cursor:pointer;font-weight:700;padding:14px 0}.source-disclosure details{border-bottom:1px solid var(--line)}.slide-preview{margin:0 0 36px}.slide-preview h2{font-size:1.2rem}.slide-preview figcaption{font-size:.85rem;color:var(--muted)}.guide-card{padding:24px 0;border-top:1px solid var(--line);text-decoration:none;color:var(--ink)}.guide-card h2{font-size:1.3rem}.guide-card p{color:var(--muted);font-size:.9rem}.empty-state{margin:32px 0;padding:28px;background:var(--surface-alt);border-left:4px solid var(--action)}.empty-state h2{font-size:1.5rem}.not-found{max-width:68ch;padding:50px 0}.error-number{font-size:5rem;font-weight:700;color:var(--muted)}.no-preview{display:grid;place-items:center;height:100%;padding:20px;color:var(--muted);font-size:.85rem;text-align:center}.layout-card{min-width:0}.layout-card h3{margin-top:16px}.layout-card p{font-size:.9rem;color:var(--muted)}.layout-card img{width:100%;border:1px solid var(--line)}.table-wrap{margin:24px 0}.source-disclosure{max-width:100%}.detail-layout .button{max-width:100%;gap:12px}.detail-layout aside a{overflow-wrap:anywhere}main>article.prose{padding-top:48px}.guide-reading .prose{padding-top:0}.next-step{margin-top:40px;padding:24px;background:var(--surface-alt)}.next-step h2{font-size:1.3rem}.guide-reading{margin-top:48px}.guide-reading h1{font-size:clamp(2rem,4vw,3.6rem)}.kit-consumed{border-top:1px solid var(--line);padding-top:24px;margin-top:32px}.kit-consumed h2{font-size:1.5rem}
@media(max-width:1000px){.template-grid,.layout-grid,.guide-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.catalog-layout{grid-template-columns:170px minmax(0,1fr);gap:24px}}
@media(max-width:700px){.template-grid,.layout-grid,.guide-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:30px 16px}.catalog-layout{display:block}.topic-nav{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:24px}.topic-nav h2{width:100%}.section-heading{align-items:start}.detail-layout{gap:24px}.guide-reading{margin-top:28px}}
@media(max-width:360px){.template-grid,.layout-grid,.guide-grid{grid-template-columns:1fr}}

/* Preserve intrinsic-width safety on narrow reading layouts. */
.article-layout>*{min-width:0}.article-layout{min-width:0}@media(max-width:700px){.article-layout,.detail-layout{grid-template-columns:minmax(0,1fr)}.toc,.article-layout article{min-width:0;max-width:100%}.toc a{overflow-wrap:anywhere}}