/* Case content only. site.css supplies the shared palette, fonts, header and footer. */
.case-main{overflow:visible;background:var(--paper);color:var(--ink)}
.case-main .shell{width:min(var(--page-width),calc(100% - 112px));margin-inline:auto}
.case-main .icon{display:inline-block;width:1em;height:1em;flex-shrink:0;vertical-align:middle}
.case-main .reveal{opacity:1;transform:none}
.case-main .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}
.case-main :is(h1,h2,h3,p,li,td,th,dd){overflow-wrap:break-word}
.case-main :is(ul,ol){margin:0;padding:0}
.case-main :is(figure,dl,dd){margin:0}
.case-main .eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:.75rem;font-weight:600;color:var(--accent)}
.case-main .eyebrow::before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor}
.case-main .eyebrow.light{color:var(--accent)}

/* Opening story and ownership. */
.case-hero{padding-block:2.5rem 5.5rem}
.back-link{display:inline-flex;align-items:center;gap:.65rem;font-size:.875rem;color:var(--muted)}
.back-link .icon{transform:rotate(180deg)}
.case-kicker{display:flex;align-items:center;flex-wrap:wrap;gap:.75rem 1.25rem;margin-top:4rem;color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.06em}
.case-hero h1{max-width:23ch;margin:1.5rem 0;font-size:clamp(2.375rem,4.25vw,4rem);font-weight:600;line-height:1.1;letter-spacing:-.05em}
.case-hero h1 em{font-family:inherit;font-style:normal;font-weight:600;color:var(--accent);letter-spacing:-.035em}
.case-lede{max-width:58rem;font-size:1.125rem;line-height:1.7;color:var(--muted)}
.story-intro{max-width:64rem}.story-intro>span{display:block}
.story-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin-top:2.75rem}
.story-summary>div{padding:1.5rem;border:1px solid var(--line);border-top:2px solid var(--accent);border-radius:.75rem;background:var(--paper)}
.summary-label,.case-meta .k{display:block;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.055em}
.summary-label{margin-bottom:.9rem;color:var(--accent)}
.story-summary strong{display:block;font-size:1.25rem;font-weight:500;line-height:1.4;letter-spacing:-.025em}
.story-summary p{margin-top:.75rem;font-size:.9375rem;line-height:1.7;color:var(--muted)}
.case-meta{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:2rem;margin-top:3rem;padding-top:2rem;border-top:1px solid var(--line)}
.case-meta .k{margin-bottom:.65rem;color:var(--muted)}.case-meta .k.role-label{color:var(--accent)}
.case-meta .v{font-size:.9375rem;line-height:1.65}

/* The index stays below the shared header, including at browser zoom. */
.case-layout{display:grid;grid-template-columns:15.5rem minmax(0,1fr);align-items:start;gap:4rem;padding-bottom:6rem}
.case-layout>article{min-width:0}
.case-toc{position:sticky;top:calc(var(--header-height,84px) + 24px);display:flex;flex-direction:column;min-height:0;max-height:calc(100dvh - var(--header-height,84px) - 48px)}
.case-toc>p{flex-shrink:0;margin-bottom:1rem;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.case-toc>nav{min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;padding:3px 8px 3px 3px}
.case-toc ol,.mobile-toc ol{list-style:none;display:grid;gap:.45rem}
.case-toc nav a,.mobile-toc nav a{display:flex;align-items:baseline;gap:.75rem;padding-block:.35rem;color:var(--muted);font-size:.875rem;line-height:1.6;transition:color .2s ease}
.case-toc nav a span,.mobile-toc nav a span{flex-shrink:0;min-width:1.25rem;color:var(--subtle);font-variant-numeric:tabular-nums}
.case-toc a[aria-current],.mobile-toc a[aria-current]{color:var(--ink);font-weight:600}
.case-toc a[aria-current] span,.mobile-toc a[aria-current] span{color:var(--accent)}
.case-toc .deck-link{display:inline-flex;flex-shrink:0;gap:.5rem;margin-top:1.5rem;padding-top:1rem;border-top:1px solid var(--line);color:var(--accent);font-size:.8125rem;line-height:1.6}
.mobile-toc{display:none}
.case-block{padding-bottom:3.5rem;margin-bottom:3.5rem;border-bottom:1px solid var(--line)}
.case-block:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0}
.case-block h2{margin-bottom:1.25rem;font-size:clamp(1.625rem,2.2vw,2rem);font-weight:600;letter-spacing:-.035em;line-height:1.25}
.case-block>p{max-width:58rem;font-size:1rem;line-height:1.75;color:var(--muted)}
.case-block>p+p{margin-top:1.25rem}
.case-block .case-note{font-size:.875rem;line-height:1.75;color:var(--subtle)}
.story-subheading{margin:2.5rem 0 1rem;font-size:1.25rem;font-weight:500;letter-spacing:-.025em}

/* Evidence, decisions and supporting cards. */
.evidence-table{margin:2rem 0;border:1px solid var(--line);border-radius:.75rem;overflow:hidden}
.evidence-table table{width:100%;table-layout:fixed;border-collapse:collapse;text-align:left;font-size:.9375rem;line-height:1.7}
.evidence-table th,.evidence-table td{padding:1.25rem 1.5rem;vertical-align:top;overflow-wrap:anywhere}
.evidence-table th{color:var(--accent);font-size:.875rem;font-weight:600;border-bottom:1px solid var(--line)}
.evidence-table tbody td{color:var(--muted)}.evidence-table tr+tr{border-top:1px solid var(--line)}
.evidence-table th+th,.evidence-table td+td{border-left:1px solid var(--line)}
.case-main .decision-list{list-style:none;counter-reset:decisions;margin-block:2rem}
.decision-list li{counter-increment:decisions;position:relative;margin-bottom:.75rem;padding:1.5rem 1.5rem 1.5rem 4rem;border:1px solid var(--line);border-radius:.75rem;background:var(--paper);font-size:1rem;line-height:1.8;color:var(--muted)}
.decision-list li::before{content:counter(decisions,decimal-leading-zero);position:absolute;left:1.5rem;top:1.6rem;font-size:.8125rem;font-weight:600;color:var(--accent)}
.decision-list strong{display:block;margin-bottom:.4rem;color:var(--ink);font-size:1.125rem;font-weight:500}
.decision-chapter{margin-top:2.75rem;padding-top:2rem;border-top:1px solid var(--line)}
.chapter-number,.insight-label{font-size:.8125rem;font-weight:600;text-transform:uppercase;letter-spacing:.055em;color:var(--accent)}
.decision-chapter>h3{margin:1rem 0;font-size:1.5rem;line-height:1.35;letter-spacing:-.03em;font-weight:500}
.decision-chapter>p{font-size:1rem;line-height:1.75;color:var(--muted)}
.case-main .decision-reasoning{margin-block:1.75rem}
.decision-reasoning>div{display:grid;grid-template-columns:7rem minmax(0,1fr);gap:1.5rem;padding:1.25rem 0;border-top:1px solid var(--line);font-size:.9375rem;line-height:1.7}
.decision-reasoning dt{font-weight:500}.decision-reasoning dd{color:var(--muted)}
.story-note,.learning-callout{margin-top:1.75rem;padding:1.75rem 2rem;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:0 .75rem .75rem 0;background:var(--paper)}
.story-note strong,.learning-callout strong{display:block;color:var(--accent);font-size:1rem;font-weight:600}
.story-note p,.learning-callout p{margin-top:.75rem;color:var(--muted);font-size:1rem;line-height:1.7}.ownership-note p{color:var(--ink)}
.system-grid,.insight-grid,.iteration-grid,.official-product-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.25rem;margin-top:2rem}
:is(.system-grid,.insight-grid,.iteration-grid,.official-product-grid) article{min-width:0;padding:1.5rem;border:1px solid var(--line);border-radius:.75rem}
:is(.system-grid,.insight-grid,.iteration-grid,.official-product-grid) h3{margin-bottom:.75rem;font-size:1.125rem;line-height:1.4;font-weight:500;letter-spacing:-.02em}
:is(.system-grid,.insight-grid,.iteration-grid,.official-product-grid) p{font-size:.9375rem;line-height:1.7;color:var(--muted)}
.insight-grid article{display:flex;flex-direction:column}.insight-grid h3,.iteration-grid h3{margin-top:1rem}.insight-grid p{margin-bottom:1.5rem}
.design-response{margin-top:auto;padding-top:1rem;border-top:1px solid var(--line);font-size:1rem;line-height:1.75}
.design-response span{display:block;margin-bottom:.5rem;color:var(--accent);font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em}
.opportunity-quote{margin-block:2rem;padding-left:1.75rem;border-left:3px solid var(--accent);font-size:1.75rem;line-height:1.5;letter-spacing:-.025em}
.case-main .principle-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.75rem;margin-top:2rem;list-style:none}
.principle-list li{padding:1.25rem;border:1px solid var(--line);border-radius:.75rem;font-size:1rem;line-height:1.75}
.case-main .validation-questions{list-style:disc;padding-left:1.25rem;color:var(--muted);font-size:1rem;line-height:1.75}.validation-questions li{padding-bottom:.75rem}
.takeaway-list article+article{border-top:1px solid var(--line);padding-top:1.5rem;margin-top:1.5rem}
.takeaway-list h3{margin-bottom:.75rem;font-size:1.25rem;font-weight:500}.takeaway-list p{font-size:1rem;line-height:1.8;color:var(--muted)}

/* Product images retain their real interface colors. */
.product-gallery{display:flex;flex-direction:column;gap:2.5rem;margin-top:2rem}.product-shot{min-width:0}
.product-shot .shot-frame{display:block;position:relative;border:1px solid var(--line);border-radius:.75rem;overflow:hidden;background:var(--paper)}
.product-shot img{display:block;width:100%;max-width:100%;height:auto}
.product-shot figcaption{display:flex;gap:1rem;margin-top:1.25rem}
.shot-index{flex-shrink:0;padding-top:.2rem;font-size:.8125rem;color:var(--accent);font-variant-numeric:tabular-nums}
.product-shot h3{margin-bottom:.5rem;font-size:1rem;font-weight:500;line-height:1.45}
.product-shot figcaption p{font-size:.875rem;line-height:1.7;color:var(--muted)}
/* Shared rhythm for case-study images, including figures outside decision chapters. */
.case-main .decision-shot,.case-block > .product-shot{margin-top:2rem}
.case-hero > .product-shot{margin-top:3rem}
.case-block > .product-shot + p{margin-top:2rem}
.case-block > h3{margin:2.75rem 0 1rem;font-size:1.5rem;line-height:1.35;letter-spacing:-.03em;font-weight:500}
.case-block > h2 + h3{margin-top:1.75rem}
.case-block > .product-shot + h3{margin-top:2.75rem}
.case-hero .hero-shot-caption{justify-content:center;text-align:center}

/* Black panels give flows and outcomes consistent emphasis. */
.flow-wrap{padding-bottom:5rem}
.case-flow{border-radius:1rem;padding:3rem;background:var(--dark);color:#fff}
.case-flow h2{max-width:25ch;margin:1rem 0 2.5rem;font-size:2rem;line-height:1.25;letter-spacing:-.035em;font-weight:600}
.case-main .flow-list,.case-main .journey-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.75rem;list-style:none}
.flow-list li{position:relative;min-width:0;padding:1.5rem;border:1px solid #ffffff40;border-radius:.65rem}
.flow-list .step,.journey-strip span{display:block;margin-bottom:1rem;color:var(--accent);font-size:.75rem;font-weight:500;font-variant-numeric:tabular-nums}
.flow-list strong{display:block;max-width:14ch;padding-right:.5rem;font-size:1rem;font-weight:500;line-height:1.5}
.flow-list .icon{position:absolute;top:1.5rem;right:1rem;color:#ffffff99}
.flow-caption{max-width:48rem;margin-top:1.75rem;font-size:.9375rem;line-height:1.8;color:#ffffffb3}
.case-main .journey-strip{margin-bottom:1.5rem}
.journey-strip li{min-width:0;padding:1.25rem;background:var(--dark);color:#fff;border-radius:.65rem;font-size:.9375rem;line-height:1.6}
.case-main .case-results{list-style:none;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin-block:2rem}
.case-results li{min-width:0;padding:1.75rem 1.25rem;background:var(--dark);color:#fff;border-radius:.75rem}
.case-results .n{display:block;font-size:clamp(1.65rem,2.8vw,3rem);font-weight:500;line-height:1.2;letter-spacing:-.04em;overflow-wrap:anywhere}
.case-results .n small{display:block;margin-bottom:.75rem;font-size:.8125rem;font-weight:400;line-height:1.5;letter-spacing:0;color:var(--accent)}
.case-results .l{display:block;margin-top:1rem;font-size:.875rem;line-height:1.6;color:#ffffffbf}
.public-impact{display:flex;align-items:center;gap:2.5rem;margin-bottom:1.5rem;padding:2.5rem;border-radius:1rem;background:var(--dark);color:#fff}
.public-impact-value{flex-shrink:0;font-size:5rem;line-height:1;letter-spacing:-.05em;font-weight:500}
.public-impact-value small{display:block;max-width:12rem;margin-bottom:.75rem;color:var(--accent);font-size:.8125rem;line-height:1.6;letter-spacing:0}
.public-impact h3{margin-bottom:.75rem;font-size:1.25rem;font-weight:500}.public-impact p{color:#ffffffbf;font-size:.9375rem;line-height:1.7}
.evidence-callout{display:flex;align-items:center;gap:2rem;margin-block:2rem;padding:2rem;border:1px solid var(--line);border-radius:.75rem}
.evidence-number{font-size:4.5rem;line-height:1;letter-spacing:-.05em;font-weight:500;color:var(--accent)}
.evidence-callout strong{font-size:1.25rem;font-weight:500}.evidence-callout p{margin-top:.5rem;font-size:1rem;line-height:1.75;color:var(--muted)}

/* Context and walkthroughs, including archived versions. */
.official-context,.measurement-template{margin-top:2rem;padding:1.5rem;border:1px solid var(--line);border-radius:.75rem}
.official-context h3,.measurement-template h3{margin-bottom:.75rem;font-size:1.25rem;font-weight:500}
.official-context p,.measurement-template p{font-size:1rem;line-height:1.8;color:var(--muted)}
.official-context .source-note,.official-source-label{display:block;margin-top:1rem;font-size:.8125rem;line-height:1.6;color:var(--subtle)}
.official-context a,.official-product-source{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.official-product-source{display:inline-block;margin-top:1rem;font-size:.875rem}.official-product-grid+.case-note{margin-top:1.5rem}
.private-walkthrough{margin-top:2rem;padding-top:2rem;border-top:1px solid var(--line)}
.private-walkthrough h3{margin-bottom:.75rem;font-size:1.25rem;font-weight:500}.private-walkthrough p{color:var(--muted);font-size:1rem;line-height:1.75}
.private-walkthrough .animated-link{display:inline-flex;margin-top:1rem;color:var(--accent);font-size:1rem;font-weight:500;text-decoration:underline;text-underline-offset:4px}
.sample-notice{padding:1.5rem 2rem;border-bottom:1px solid var(--line);background:var(--paper)}
.sample-notice strong{font-size:1rem;font-weight:600;color:var(--accent)}.sample-notice p{max-width:65rem;margin-top:.5rem;font-size:.9375rem;line-height:1.7;color:var(--muted)}
.sample-label{display:inline-block;margin-bottom:1.25rem;padding:.4rem .75rem;border:1px dashed var(--accent);border-radius:.4rem;color:var(--accent);font-size:.75rem;line-height:1.5}
.sample-section .sample-intro,.sample-section .sample-edit-note{font-size:.9375rem;line-height:1.75;color:var(--subtle)}
.sample-section .sample-intro{margin-bottom:1.5rem}.sample-section .sample-edit-note{margin-top:1.25rem}
.sample-section caption{text-align:left;padding:1rem 1.5rem;font-size:.875rem;line-height:1.6;color:var(--accent)}
.iteration-wire{display:flex;flex-direction:column;gap:.5rem;margin-top:1.5rem;padding:1rem;border:1px solid var(--line);border-radius:.65rem;background:var(--paper);font-size:.8125rem}
.iteration-wire>span{padding:.75rem;border:1px solid var(--line);border-radius:.4rem}
.iteration-wire .wire-button{align-self:flex-end;background:var(--dark);color:#fff;border-color:var(--dark)}
.wire-textarea{min-height:5rem;padding:.75rem;border:1px solid var(--line);border-radius:.4rem;color:var(--subtle)}
.validation-meta{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin:1.5rem 0 2rem}
.validation-meta>div{padding:1.25rem;border:1px solid var(--line);border-radius:.65rem}.validation-meta strong{display:block;font-size:2.25rem;font-weight:500}
.validation-meta span{display:block;margin-top:.5rem;font-size:.875rem;line-height:1.6;color:var(--muted)}
.measurement-template dl{margin-top:1.5rem}.measurement-template dl>div{padding:1rem 0;border-top:1px solid var(--line);font-size:.9375rem;line-height:1.7}
.measurement-template dt{font-weight:500}.measurement-template dd{margin-top:.3rem;color:var(--muted)}
.case-next{padding-bottom:5rem}
.case-next>a{display:flex;align-items:center;justify-content:space-between;gap:2rem;padding:2.5rem 3rem;border-block:1px solid var(--line);transition:color .2s ease}
.case-next small{display:block;margin-bottom:.75rem;font-size:.75rem;font-weight:500;line-height:1.6;text-transform:uppercase;letter-spacing:.06em;color:var(--accent)}
.case-next strong{font-size:2.75rem;font-weight:600;line-height:1.2;letter-spacing:-.04em}
.case-next .badge{display:grid;place-items:center;flex-shrink:0;width:3.25rem;height:3.25rem;border-radius:50%;background:var(--dark);color:#fff;transition:background .2s ease}

@media(hover:hover){
 .back-link:hover,.case-toc nav a:hover,.mobile-toc nav a:hover,.case-next>a:hover{color:var(--accent)}
 .case-next>a:hover .badge{background:var(--accent)}
}
@media(max-width:1150px){
 .case-main .shell{width:calc(100% - 72px)}
 .case-layout{grid-template-columns:13.5rem minmax(0,1fr);gap:2rem}
 .case-kicker{margin-top:3rem}.case-flow{padding:2rem}.flow-list li{padding:1.25rem}
 .public-impact{gap:1.5rem;padding:2rem}.public-impact-value{font-size:4rem}
 .case-main .journey-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
 .case-main .case-results{grid-template-columns:1fr}
 .case-results li{display:flex;align-items:center;justify-content:space-between;gap:1.5rem}
 .case-results .l{max-width:15rem;margin-top:0}
}
@media(max-width:800px){
 .case-main .shell{width:calc(100% - 48px)}
 .case-hero{padding-block:2rem 4rem}.case-lede{font-size:1.0625rem}
 .case-meta{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.75rem}.story-summary{grid-template-columns:1fr}
 .case-layout{display:block;padding-bottom:4rem}.case-toc{display:none}
 .mobile-toc{display:block;margin-bottom:2.5rem;padding:1.25rem;border:1px solid var(--line);border-radius:.65rem;background:var(--paper)}
 .mobile-toc summary{cursor:pointer;font-size:.9375rem;font-weight:500;color:var(--ink)}.mobile-toc[open] summary{margin-bottom:1rem}
 .case-block{margin-bottom:3rem;padding-bottom:3rem}
 .case-main .flow-list{grid-template-columns:repeat(2,minmax(0,1fr))}
 .case-next{padding-bottom:4rem}.case-next>a{padding:2rem 0}
}
@media(max-width:520px){
 .case-main .shell{width:calc(100% - 40px)}
 .case-kicker{margin-top:2.5rem;gap:.65rem 1rem;font-size:.6875rem}.case-hero h1{font-size:2.375rem}
 .case-lede,.case-block>p,.decision-chapter>p,.case-main .validation-questions{font-size:1rem;line-height:1.75}
 .case-meta{grid-template-columns:1fr}.case-meta>div{display:grid;grid-template-columns:6.5rem minmax(0,1fr);gap:1rem}
 .case-meta .k{margin:0;line-height:1.7}.case-meta .v{font-size:.9375rem}
 .story-summary>div{padding:1.25rem}.story-summary strong{font-size:1.25rem}.case-block h2{font-size:1.625rem}
 .decision-chapter>h3{font-size:1.375rem}.decision-reasoning>div{grid-template-columns:1fr;gap:.4rem}
 .decision-list li{padding:1.25rem 1.25rem 1.25rem 3rem}.decision-list li::before{left:1rem;top:1.4rem}
 .story-note,.learning-callout{padding:1.25rem}
 .system-grid,.insight-grid,.iteration-grid,.official-product-grid,.case-main .principle-list{grid-template-columns:1fr}
 .evidence-table th,.evidence-table td{padding:.875rem .75rem;font-size:.875rem;line-height:1.7}.evidence-table th{font-size:.8125rem}
 .evidence-table:has(table th:nth-child(3)) th,.evidence-table:has(table th:nth-child(3)) td{padding-inline:.45rem;font-size:.75rem}
 .product-shot figcaption{gap:.75rem}.product-shot h3{font-size:1rem}.product-shot figcaption p{font-size:.875rem}
 .flow-wrap{padding-bottom:3rem}.case-flow{padding:1.5rem}.case-flow h2{font-size:2rem}
 .case-main .flow-list{grid-template-columns:1fr}.flow-list li{min-height:0}.flow-list strong{max-width:none;padding-right:1rem}.flow-list .step{margin-bottom:.5rem}
 .journey-strip li{padding:1rem}
 .public-impact,.evidence-callout{flex-direction:column;align-items:flex-start;gap:1.5rem;padding:1.5rem}.public-impact-value{font-size:4rem}
 .case-results li{align-items:flex-start;flex-direction:column;gap:.75rem}.case-results .n{font-size:2.5rem}.case-results .l{max-width:none}
 .validation-meta{grid-template-columns:1fr}.sample-notice{padding:1.25rem}.case-next strong{font-size:2.25rem}.case-next .badge{width:2.75rem;height:2.75rem}
}
.case-main .case-overview { max-width: 900px; padding-bottom: 80px; }
.case-overview > .case-meta { margin-top: 0; margin-bottom: 48px; }
.case-overview .case-block > ul:not(.case-results) { list-style: disc; padding-left: 22px; color: var(--muted); font-size: 16px; line-height: 1.75; }
.case-overview .case-block > ul:not(.case-results) li + li { margin-top: 16px; }

/* Ownership summary shared by the seven selected case studies. */
.case-contribution{margin-top:3rem;padding-block:2rem;border-block:1px solid var(--line);width:100%;max-width:none}
.case-contribution h2{margin:0 0 1rem;font-size:1.5rem;line-height:1.3;letter-spacing:-.03em;font-weight:500}
.case-contribution p{margin:0;font-size:1.0625rem;line-height:1.8;color:var(--muted)}