:root{--paper:#fdfdfe;--paper-deep:#f5f7fb;--surface-wash:radial-gradient(ellipse at 90% 0%,#e4edfa88,transparent 70%),var(--paper);--ink:#111318;--muted:#626b7b;--accent:#2855ff;--line:#dce1ea;--figure-bg:#f3f6ff;--header-height:73px;--font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;--panel:#f6f8fc;--panel-line:#ccd6e7;--text-label:0.875rem;--text-ui:1rem;--text-body:1.125rem;--site-width:1600px;--site-gutter:clamp(20px,3vw,48px);color-scheme:light}html.dark{--paper:#0b1220;--paper-deep:#0f172a;--surface-wash:radial-gradient(ellipse at 90% 0%,#1e3a8a33,transparent 70%),var(--paper);--ink:#f1f5f9;--muted:#a3adbf;--accent:#7c9cff;--line:#1f2a3d;--figure-bg:#111a2e;--panel:#111a2e;--panel-line:#24314a;color-scheme:dark}html.dark .display-title em{color:#7c9cff}html.dark .site-header{background:rgba(11,18,32,.97)}html.dark .desktop-navigation a{color:var(--muted)}html.dark .desktop-navigation a:hover,html.dark .desktop-navigation a[aria-current]{color:var(--ink)}html.dark .brand-period{color:#7c9cff}.brand-wash{background:var(--surface-wash)}body{font-size:var(--text-body);line-height:1.6;background:var(--paper);color:var(--ink)}::-moz-selection{background:#dbe5ff;color:#111318}::selection{background:#dbe5ff;color:#111318}button,input,select,textarea{font:inherit}a,button{-webkit-tap-highlight-color:transparent}:where(a,button,input,select,textarea,summary):focus-visible{outline:2px solid var(--accent);outline-offset:5px}button:not(:disabled),summary{cursor:pointer}button:disabled{cursor:not-allowed}main{min-width:0}main h1{font-family:var(--font-body),sans-serif;font-weight:700;letter-spacing:-.035em;text-wrap:balance}main h2,main h3{text-wrap:pretty}main [id]{scroll-margin-top:105px}.skip-link{position:fixed;z-index:100;top:-100px;left:16px;padding:12px 20px;background:var(--ink);color:white;border-radius:4px}.skip-link:focus{top:12px}.site-frame{min-height:100dvh;display:flex;flex-direction:column;background:var(--paper)}.site-main{flex:1}.site-brand{display:inline-flex;align-items:center;gap:10px;font-size:23px;font-weight:600;letter-spacing:-1px;color:var(--ink);white-space:nowrap}.brand-ppg{font-weight:700}.brand-period{color:#2855ff}.site-header{position:sticky;top:0;z-index:40;background:rgba(253,253,254,.97);border-bottom:1px solid var(--line)}.site-header-inner{max-width:var(--site-width);min-height:72px;padding:0 var(--site-gutter);margin:auto;display:flex;align-items:center;justify-content:space-between;gap:30px}.desktop-navigation{display:flex;align-items:center;gap:34px;height:72px}.desktop-navigation a{font-size:var(--text-label);font-weight:500;color:#626b7b;position:relative;display:flex;height:100%;align-items:center;transition:color .2s}.desktop-navigation a:hover,.desktop-navigation a[aria-current]{color:var(--ink)}.desktop-navigation a[aria-current]:after{content:"";position:absolute;bottom:21px;width:4px;height:4px;left:calc(50% - 2px);border-radius:50%;background:var(--accent)}.header-actions{display:flex;align-items:center;gap:24px}.header-search{padding:10px;color:var(--muted)}.header-cta{display:inline-flex;gap:16px;align-items:center;border:1px solid #c5ccd8;padding:10px 15px;border-radius:4px;font-size:var(--text-label);font-weight:600;transition:background .2s}.header-cta:hover{background:var(--paper-deep)}.mobile-menu-button{display:none;padding:8px;color:var(--ink)}.mobile-navigation{padding:12px 24px 24px;border-top:1px solid var(--line)}.mobile-navigation a{display:flex;justify-content:space-between;align-items:center;padding:17px 0;border-bottom:1px solid var(--line);font-size:var(--text-body)}.mobile-navigation small{display:block;font-size:var(--text-label);color:var(--muted);margin-top:4px}.mobile-navigation a[aria-current]{color:var(--accent);font-weight:600}.site-footer{background:#101827;margin-top:100px;padding-top:65px;border-top:1px solid #2d3b52}.site-footer,.site-footer .site-brand{color:#f0f4fc}.site-footer .brand-period{color:#8caaff}.site-footer a:focus-visible{outline:2px solid #8caaff;outline-offset:6px}.footer-top{display:grid;grid-template-columns:minmax(240px,.8fr) minmax(0,2fr);gap:56px;padding-bottom:65px}.footer-brand>p{font-family:var(--font-body),sans-serif;font-size:29px;margin-top:24px}.footer-brand>span{display:block;font-size:var(--text-label);color:#b7c4d9;margin-top:8px}.footer-groups{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px}.footer-groups nav{display:flex;flex-direction:column;align-items:flex-start;gap:12px}.footer-groups h2{font-size:var(--text-label);letter-spacing:.08em;text-transform:uppercase;margin-bottom:7px;color:#8caaff}.footer-groups a{font-size:var(--text-label);color:#dce5f7;line-height:1.6}.footer-groups a:hover{color:#ffffff;text-decoration:underline;text-underline-offset:4px}.footer-bottom{border-top:1px solid #2d3b52;min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px;font-size:var(--text-label);color:#b7c4d9}.footer-bottom nav{display:flex;flex-wrap:wrap;gap:25px}.footer-bottom a:hover{color:#ffffff;text-decoration:underline;text-underline-offset:4px}.footer-bottom>span{text-transform:uppercase;letter-spacing:.1em}.eyebrow{display:flex;align-items:center;gap:10px;line-height:1.6;font-weight:500;text-transform:uppercase;letter-spacing:.14em;color:#495364}.eyebrow-dot{width:5px;height:5px;background:#2855ff;border-radius:50%;flex:none}.display-title{font-family:var(--font-body),sans-serif;color:var(--ink);letter-spacing:-.035em;line-height:1.02;font-size:clamp(3.4rem,6.3vw,5.6rem)}.display-title em{color:#2855ff}.intro-copy{max-width:590px;color:var(--muted);font-size:var(--text-ui);line-height:1.85}.page-intro{padding:48px 0;border-bottom:1px solid var(--line);margin-bottom:42px}.page-intro .display-title{max-width:1000px;margin:20px 0 23px}.page-intro-bottom{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:25px}.page-intro-bottom:has(.page-intro-actions)>.intro-copy{flex:1 1 28rem}.page-intro-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;max-width:100%}.page-intro-actions>.text-link{flex:0 1 auto}.editorial-breadcrumbs{margin-bottom:40px;display:flex;flex-wrap:wrap;gap:12px;font-size:var(--text-label);color:var(--muted)}.editorial-breadcrumbs>span{display:inline-flex;gap:12px}.editorial-breadcrumbs a:hover{color:var(--accent)}.text-link{display:inline-flex;align-items:center;white-space:nowrap;font-weight:500;padding-bottom:5px;border-bottom:1px solid #b3bece;color:var(--ink);transition:border-color .2s}.text-link:hover{border-color:var(--ink)}.button-primary{display:inline-flex;align-items:center;justify-content:center;gap:25px;min-height:48px;padding:14px 22px;background:var(--accent);border:1px solid var(--accent);color:#f7f8fa;font-weight:500;border-radius:4px;transition:background .2s,transform .2s}.button-primary:hover{background:#1742de}.button-primary:active{transform:translateY(1px)}.hero-editorial{display:grid;grid-template-columns:.88fr 1.12fr;gap:30px;padding-top:50px;align-items:center}.hero-copy{padding:35px 0 45px}.hero-copy h1{font-size:clamp(4.4rem,6.8vw,6.4rem);line-height:.98;margin:30px 0 28px;max-width:530px}.hero-copy .intro-copy{max-width:385px;font-size:var(--text-ui)}.hero-actions{flex-wrap:wrap;gap:25px;margin-top:32px}.hero-actions,.hero-footnote{display:flex;align-items:center}.hero-footnote{margin-top:46px;gap:11px;color:#626b7b}.hero-footnote:before{content:"";width:25px;height:1px;background:#9ba8be}.optical-story{min-width:0;position:relative;background:radial-gradient(ellipse at 55% 42%,#eceddc 0,#f1f2e7 45%,#f3f3eb 77%);border-radius:7px;border:1px solid #e4e6db}.optical-heading{display:flex;justify-content:space-between;gap:15px;padding:21px 24px 0;font-size:var(--text-label);letter-spacing:.1em;text-transform:uppercase;color:#77846c}.optical-heading span:first-child{color:#3e5838}.optical-diagram{display:block;width:100%;height:auto}.optical-caption{padding:0 24px 22px}.optical-steps{display:flex;border-top:1px solid #d4dbc9;border-bottom:1px solid #d4dbc9}.optical-steps button{flex:1;display:flex;align-items:center;justify-content:flex-start;gap:7px;min-height:46px;font-size:var(--text-label);color:#7c8871;border-bottom:2px solid transparent;margin-bottom:-1px}.optical-steps button span{font-size:var(--text-label);opacity:.65}.optical-steps button[aria-pressed=true]{color:#284b32;border-bottom-color:#527848}.optical-caption>p{margin-top:14px;font-size:var(--text-label);line-height:1.7;color:#5d6d55;min-height:38px;max-width:470px}.optical-caption>small{display:block;margin-top:9px;font-size:var(--text-label);color:#849078}.photon-route{animation:photon-travel 7s linear infinite}.blood-vessel,.detected-signal,.light-path{transition:opacity .35s}.optical-story[data-step="1"] .light-path{opacity:.3}.optical-story[data-step="1"] .blood-vessel{stroke-width:19}.optical-story[data-step="2"] .detected-signal rect{stroke:#8aab76}@keyframes photon-travel{to{stroke-dashoffset:-120}}.orientation-strip{display:flex;justify-content:space-between;gap:25px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:50px;padding:22px 0;font-size:var(--text-label);color:var(--muted)}.orientation-strip p{color:var(--ink)}.orientation-strip div{display:flex;flex-wrap:wrap;gap:28px}.orientation-strip a:hover{color:var(--ink)}.editorial-section{padding-top:80px}.section-heading{display:flex;justify-content:space-between;gap:30px;align-items:flex-end;margin-bottom:32px}.section-heading h2{font-family:var(--font-body),sans-serif;font-weight:700;font-size:clamp(2.3rem,3.5vw,3.3rem);line-height:1.12;letter-spacing:-.025em}.section-heading p:not(.eyebrow){max-width:520px;margin-top:12px;font-size:var(--text-label);line-height:1.7;color:var(--muted)}.section-number{margin-bottom:15px}.resource-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.resource-card{display:flex;flex-direction:column;min-width:0;transition:border-color .2s}.resource-card:hover{border-color:#2855ff}.resource-art{background:var(--figure-bg);color:#2855ff;position:relative;border-radius:5px;overflow:hidden}.resource-card:nth-child(3n+2) .resource-art{--figure-bg:#edf0f5;color:#52647f}.resource-card:nth-child(3n+3) .resource-art{--figure-bg:#f3f6ff;color:#2855ff}.signal-figure{width:100%;display:block}.resource-art .signal-figure{transition:transform .6s}.resource-card:hover .resource-art .signal-figure{transform:scale(1.025)}.figure-index{position:absolute;left:17px;bottom:13px;font-size:var(--text-label);letter-spacing:.1em;opacity:.6}.resource-body{padding:25px 0;display:flex;flex-direction:column;flex:1}.resource-body h2{font-family:var(--font-body),sans-serif;font-size:var(--text-body);font-weight:500;letter-spacing:-.025em;line-height:1.35}.resource-body p{margin-top:12px;color:var(--muted);line-height:1.8;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.resource-action{display:flex;align-items:center;justify-content:flex-start;gap:8px;color:#2855ff;margin-top:auto;font-weight:500}.resource-action>span{font-size:var(--text-body);transition:transform .2s}.article-card-link:hover .resource-action>span,.resource-card:hover .resource-action>span{transform:translate(2px,-2px)}.resource-index{font-size:var(--text-label);color:#626b7b;margin-bottom:18px}.resource-meta{display:flex;flex-wrap:wrap;gap:7px;color:#626b7b;margin-top:16px}.collection-feature{display:grid;grid-template-columns:.8fr 1.2fr;align-items:center;gap:60px;background:#edf0f5;border:1px solid var(--line);border-radius:6px;padding:35px 45px;margin-bottom:45px}.collection-feature h2{font-family:var(--font-body),sans-serif;font-weight:700;font-size:38px;letter-spacing:-.02em;line-height:1.1;margin:12px 0}.collection-feature p{font-size:var(--text-label);line-height:1.8;color:var(--muted);margin-bottom:20px}.collection-feature .signal-figure{color:#2855ff;max-width:380px}.collection-links{display:flex;flex-wrap:wrap;gap:12px;padding:0 0 30px}.collection-links a{font-size:var(--text-label);padding:9px 15px;border:1px solid var(--line);border-radius:3px;color:var(--muted)}.collection-links a:hover{background:var(--paper-deep);color:var(--ink)}.article-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:38px 26px}.article-card{min-width:0}.article-card-link{display:flex;height:100%;flex-direction:column}.article-art{aspect-ratio:1.65;position:relative;background:#edf0f5;color:#2855ff;border-radius:5px;overflow:hidden}.article-art img{height:100%;width:100%;-o-object-fit:cover;object-fit:cover;transition:transform .6s}.article-card-link:hover img{transform:scale(1.025)}.article-art .signal-figure{height:100%}.article-type{position:absolute;left:14px;top:14px;background:rgba(253,253,254,.94);padding:6px 9px;font-size:var(--text-label);letter-spacing:.07em;text-transform:uppercase;color:#111318;border-radius:2px}.article-card-body{padding:19px 0 22px;border-bottom:1px solid var(--line);flex:1;display:flex;flex-direction:column}.article-meta{display:flex;flex-wrap:wrap;gap:12px;font-size:14px;line-height:1.5;color:#626b7b;margin-bottom:12px}.article-meta span{padding-left:12px;border-left:1px solid var(--line)}.article-card h3{font-size:var(--text-body);font-weight:500;line-height:1.45;letter-spacing:-.025em}.article-description{font-size:16px;color:var(--muted);line-height:1.65;margin-top:12px;display:-webkit-box;-webkit-line-clamp:5;-webkit-box-orient:vertical;overflow:hidden}.article-featured .article-card-link{display:grid;grid-template-columns:1.15fr 1fr;gap:36px;align-items:center}.article-featured .article-art{aspect-ratio:1.5}.article-featured .article-card-body{border:none;padding:10px 0}.article-featured h3{font-family:var(--font-body),sans-serif;font-size:clamp(1.9rem,3vw,2.8rem);font-weight:700;line-height:1.12}.home-reading{display:grid;grid-template-columns:1.65fr 1fr;gap:45px}.home-reading .article-featured .article-card-link{display:flex;gap:0}.home-reading .article-featured .article-card-body{padding:24px 0;border-bottom:1px solid var(--line)}.reading-aside{display:flex;flex-direction:column}.reading-aside>a{border-bottom:1px solid var(--line);padding:25px 0;flex:1;display:flex;flex-direction:column;justify-content:center}.reading-aside>a:first-child{border-top:1px solid var(--line)}.reading-aside h3{font-size:19px;font-weight:500;line-height:1.45;margin-top:13px;letter-spacing:-.025em}.reading-aside .eyebrow{font-size:var(--text-label)}.atlas-feature{display:grid;grid-template-columns:1fr .9fr;gap:75px;background:#edf0f5;border-radius:6px;padding:50px;border:1px solid var(--line)}.atlas-feature h2{font-family:var(--font-body),sans-serif;font-size:clamp(2.5rem,4vw,3.8rem);font-weight:700;line-height:1.08;letter-spacing:-.03em;margin:22px 0}.atlas-feature p:not(.eyebrow){font-size:var(--text-label);line-height:1.85;color:var(--muted);margin-bottom:28px;max-width:52ch}.atlas-index{display:flex;flex-direction:column;justify-content:center}.atlas-index a{display:flex;align-items:center;justify-content:space-between;gap:15px;border-bottom:1px solid #d2d9e5;padding:22px 0;font-size:var(--text-label)}.atlas-index a:first-child{border-top:1px solid #d2d9e5}.atlas-index b{font-size:32px;font-weight:400;font-variant-numeric:tabular-nums;color:#2855ff}.evidence-note{display:grid;grid-template-columns:.5fr 1fr;gap:50px;border-top:1px solid var(--line);margin-top:70px;padding-top:30px}.evidence-note h2{font-family:var(--font-body),sans-serif;font-size:30px;line-height:1.2}.evidence-note p{font-size:var(--text-label);line-height:1.9;color:var(--muted);max-width:650px}.evidence-note a{text-decoration:underline;text-underline-offset:3px}.library-browser{scroll-margin-top:105px}.browser-heading{display:flex;align-items:center;justify-content:space-between;gap:30px;margin-bottom:22px}.browser-heading h2{font-size:20px;font-weight:500;letter-spacing:-.02em}.library-search{display:flex;align-items:center;gap:10px;border:1px solid #c5ccd8;border-radius:4px;padding:0 13px;max-width:360px;width:100%;color:#626b7b;background:#ffffff}.library-search input{background:transparent;min-width:0;width:100%;border:none;padding:12px 0;outline:none;font-size:var(--text-label);color:var(--ink)}.library-search:focus-within{outline:2px solid var(--accent);outline-offset:3px}.library-controls{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,320px);gap:16px;align-items:center}.library-controls .library-search{max-width:none;min-height:48px}.library-topic{min-width:0}.library-topic select{height:48px;padding:10px 40px 10px 14px;border:1px solid #c5ccd8;border-radius:4px;background:#fff;font-size:15px;color:var(--ink);text-overflow:ellipsis}.browser-results{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px 20px;margin:18px 0 26px;min-height:40px}.browser-results-label{font-size:14px;color:var(--muted);line-height:1.5}.browser-reset{display:inline-flex;align-items:center;gap:6px;min-height:40px;font-size:14px;color:var(--accent)}.browser-reset:hover{text-decoration:underline;text-underline-offset:3px}@media (max-width:600px){.library-controls{grid-template-columns:minmax(0,1fr);gap:12px}.browser-results{align-items:flex-start}}.browser-empty{padding:70px 20px;text-align:center;border:1px solid var(--line);border-radius:5px}.browser-empty h3{font-size:23px}.browser-empty p{font-size:var(--text-label);color:var(--muted);margin:10px 0 25px}.browser-more{display:flex;justify-content:center;margin:40px 0}.blog-title{font-family:var(--font-body),sans-serif;font-weight:700;color:var(--ink);line-height:1.04;overflow-wrap:anywhere}.blog-kicker{color:#2855ff;font-size:var(--text-label);font-weight:500;letter-spacing:.12em}.blog-dek{color:var(--muted);font-size:1.05rem;line-height:1.8}.blog-meta{border-color:var(--line);color:var(--muted)}.blog-cover{border-radius:5px;border:none;box-shadow:none}.blog-prose{color:#354052;font-size:var(--text-body);line-height:1.8}.blog-prose :is(h2,h3,h4,strong){color:var(--ink)}.blog-prose a{color:var(--accent)}.blog-prose a:hover{color:var(--ink)}.blog-prose blockquote{border-color:#2855ff;background:#f5f8ff;color:#354052;padding:20px 25px;font-family:var(--font-body),sans-serif;font-size:26px;line-height:1.5}.blog-prose :is(pre,code,thead){background:#edf0f5}.blog-prose code{color:var(--ink)}.blog-prose li::marker{color:#2855ff}.blog-prose figure img,.blog-prose img{border-radius:5px}.blog-toc-card{background:transparent;border:none;border-left:1px solid var(--line);border-radius:0;box-shadow:none;backdrop-filter:none}.blog-toc-toggle{color:var(--ink);font-size:var(--text-label)}.blog-toc-nav{border-color:var(--line)}.blog-toc-nav a{color:var(--muted);font-size:var(--text-label);line-height:1.5;padding:6px 8px}.blog-toc-nav a.is-active{color:var(--accent);background:#f3f6ff}.blog-toc-nav a:hover{color:var(--ink);background:#edf0f5}.ppg-docs-shell{--color-fd-background:#f7f8fa;--color-fd-foreground:#111318;--color-fd-muted:#edf0f5;--color-fd-muted-foreground:#626b7b;--color-fd-card:#f1f3f7;--color-fd-border:#dce1ea;--color-fd-primary:#2855ff;--color-fd-accent:#eaf0ff;--color-fd-ring:#2855ff;--color-fd-accent-foreground:#111318}.ppg-site-navbar>.site-header{position:relative}.ppg-docs-shell #nd-sidebar,.ppg-docs-shell #nd-subnav,.ppg-docs-shell #nd-toc{top:var(--header-height)!important}.ppg-docs-shell #nd-toc{height:calc(100dvh - var(--header-height))}.ppg-docs-shell #nd-tocnav{top:calc(var(--header-height) + 56px)!important}.ppg-docs-shell #nd-page h1{font-family:var(--font-body),sans-serif;font-size:48px;letter-spacing:-.03em}.research-intro-art{padding:20px;border:1px solid var(--line);background:#f5f8ff;border-radius:5px;color:#2855ff}.research-intro-grid{display:grid;grid-template-columns:1.4fr .6fr;align-items:center;gap:45px}.research-intro-grid .page-intro{border:none;margin:0}.stat-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:10px 0 30px;padding:25px 0}.stat-strip>div{padding-left:25px;border-left:1px solid var(--line)}.stat-strip>div:first-child{padding-left:0;border:none}.stat-strip strong{font-size:32px;font-weight:400;font-variant-numeric:tabular-nums;letter-spacing:-.04em}.stat-strip span{display:block;font-size:var(--text-label);color:var(--muted);margin-top:3px}.tools-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px}.tool-feature{border-bottom:1px solid var(--line);padding-bottom:30px}.tool-feature-art{aspect-ratio:1.7;background:#f3f6ff;border-radius:6px;color:#2855ff;margin-bottom:25px;overflow:hidden}.tool-feature:nth-child(2) .tool-feature-art{background:#edf0f5;color:#52647f}.tool-feature-art .signal-figure{height:100%}.tool-feature h2{font-family:var(--font-body),sans-serif;font-size:38px;line-height:1.1}.tool-feature p{font-size:var(--text-label);line-height:1.8;color:var(--muted);margin:16px 0 25px}.tool-links{display:flex;flex-wrap:wrap;gap:24px;align-items:center}@media (min-width:1600px){.hero-editorial{padding-top:70px}}@media (max-width:1050px){.desktop-navigation{gap:23px}.header-actions{gap:10px}.hero-copy h1{font-size:72px}.hero-editorial{gap:20px}.optical-heading{padding-left:16px;padding-right:16px;font-size:var(--text-label)}.optical-caption{padding:0 16px 18px}.optical-steps button{font-size:var(--text-label);gap:5px}.footer-top{gap:45px}.home-reading{gap:30px}.atlas-feature{padding:35px;gap:40px}}@media (max-width:760px){:root{--header-height:69px}.site-header-inner{min-height:68px;padding:0 16px;gap:15px}.site-brand{font-size:21px;gap:8px}.site-brand svg{width:31px;height:31px}.desktop-navigation{display:none}.mobile-menu-button{display:block}.header-actions{gap:10px}.header-search{display:none}.header-cta{font-size:var(--text-label);padding:9px 10px;gap:9px}.hero-editorial{grid-template-columns:1fr;padding-top:35px;gap:8px}.hero-copy{padding:10px 4px 32px}.hero-copy h1{font-size:clamp(4.4rem,12vw,6rem);max-width:600px;margin:24px 0}.hero-copy .intro-copy{max-width:460px}.hero-footnote{margin-top:27px}.hero-actions{gap:24px;margin-top:26px}.optical-story{max-width:640px;width:100%;margin:0 auto}.optical-heading{padding:20px 20px 0;font-size:var(--text-label)}.optical-caption{padding:0 20px 20px}.optical-steps button{font-size:var(--text-label)}.optical-caption>p{min-height:40px}.orientation-strip{margin-top:35px;flex-direction:column;gap:12px}.orientation-strip div{gap:20px}.editorial-section{padding-top:58px}.section-heading{gap:20px;align-items:flex-start}.section-heading>.text-link{margin-top:15px}.section-heading h2{font-size:37px}.resource-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.home-paths{grid-template-columns:1fr;gap:24px}.home-paths .resource-card{display:grid;grid-template-columns:.85fr 1.15fr;gap:23px;padding-bottom:24px}.home-paths .resource-body{padding:7px 0}.home-paths .resource-art{align-self:start;margin-top:5px}.home-paths .resource-body h2{font-size:var(--text-body)}.home-paths .resource-body p{font-size:var(--text-label);margin-top:8px}.home-paths .resource-action{padding-top:12px}.article-grid{grid-template-columns:minmax(0,1fr);gap:30px 20px}.article-type{display:none}.home-reading{grid-template-columns:1fr;gap:20px}.reading-aside{display:grid;grid-template-columns:1fr 1fr;gap:24px}.reading-aside>a:first-child{border-top:none}.reading-aside h3{font-size:var(--text-ui)}.atlas-feature{grid-template-columns:1fr;gap:10px;padding:30px}.atlas-feature h2{max-width:400px}.atlas-index a{padding:17px 0}.evidence-note{grid-template-columns:1fr;gap:20px;margin-top:50px}.footer-top{grid-template-columns:1fr;gap:38px;padding-bottom:40px}.site-footer{margin-top:65px;padding-top:40px}.footer-bottom{flex-wrap:wrap;padding:22px 0;gap:18px}.footer-bottom>span{display:none}.footer-brand>p{margin-top:20px}.page-intro{padding-top:30px;margin-bottom:30px}.page-intro .display-title{margin-top:20px;font-size:58px}.page-intro-bottom{align-items:flex-start;flex-direction:column;gap:20px}.page-intro-bottom:has(.page-intro-actions)>.intro-copy{flex:initial}.editorial-breadcrumbs{margin-bottom:30px}.collection-feature{grid-template-columns:.7fr 1.3fr;padding:22px;gap:25px}.collection-feature h2{font-size:31px}.article-featured .article-card-link{grid-template-columns:1fr;gap:15px}.article-featured .article-art{aspect-ratio:1.7}.article-featured h3{font-size:36px}.browser-heading{flex-direction:column;align-items:flex-start;gap:16px}.library-search{max-width:none}.research-intro-grid{grid-template-columns:1fr;gap:0}.research-intro-art{display:none}.stat-strip strong{font-size:27px}.stat-strip>div{padding-left:15px}.stat-strip span{font-size:var(--text-label)}.tools-grid{gap:30px}.tool-feature h2{font-size:32px}}@media (max-width:480px){.hero-copy h1{font-size:67px}.hero-copy .eyebrow,.hero-copy .intro-copy{font-size:var(--text-label)}.article-grid,.resource-grid:not(.home-paths),.tools-grid{grid-template-columns:1fr}.resource-card:not(.resource-card-illustrated) .resource-body{padding:20px 0}.resource-index{margin-bottom:10px}.section-heading{flex-direction:column;gap:15px}.section-heading>.text-link{margin-top:0}.reading-aside{grid-template-columns:1fr;gap:0}.reading-aside h3{font-size:19px}.collection-feature{grid-template-columns:1fr;gap:0}.collection-feature .signal-figure{max-height:150px}.footer-groups{gap:15px}.footer-groups a,.footer-groups h2{font-size:var(--text-label)}.footer-brand>p{font-size:27px}.page-intro .display-title{font-size:49px}.intro-copy{font-size:var(--text-label)}.stat-strip>div{padding-left:10px}.stat-strip strong{font-size:23px}.optical-heading,.stat-strip span{font-size:var(--text-label)}.optical-heading{padding:16px 15px 0}.optical-caption{padding:0 15px 17px}.optical-steps button{gap:4px;min-height:42px}.diagram-annotations,.optical-caption>p,.optical-caption>small,.optical-steps button{font-size:var(--text-label)}.article-card h3{font-size:21px}.article-featured h3{font-size:33px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:after,:before{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.photon-route{animation:none}}.about-story{display:grid;grid-template-columns:.85fr 1fr;gap:70px;align-items:center;padding:20px 0}.about-art{background:#f5f8ff;padding:35px;border-radius:6px}.about-art .eyebrow{justify-content:center;margin-top:20px}.about-story h2{font-family:var(--font-body),sans-serif;font-size:42px;line-height:1.15}.about-story p{font-size:var(--text-ui);line-height:1.9;color:var(--muted);margin:22px 0}.research-tab-bar{top:var(--header-height)}.tool-feature .eyebrow{margin:0 0 13px;font-size:var(--text-label)}@media (max-width:760px){.about-story{grid-template-columns:1fr;gap:30px}.about-art{max-width:480px;width:100%}.about-story h2{font-size:36px}}.ppg-site-navbar{position:sticky;top:0;z-index:40}.ppg-docs-shell{--color-fd-secondary:#edf0f5;--color-fd-secondary-foreground:#111318;--color-fd-card-foreground:#111318;--color-fd-popover:#f7f8fa;--color-fd-popover-foreground:#111318}.ppg-docs-shell #nd-page .prose{line-height:1.85}.ppg-docs-shell #nd-page :is(h1,h2,h3)[id]{scroll-margin-top:calc(var(--header-height) + var(--fd-nav-height, 0px) + var(--fd-tocnav-height, 0px) + 24px)}.ppg-docs-shell #nd-page .prose h2{font-size:26px;font-weight:500;line-height:1.3;letter-spacing:-.025em;margin:40px 0 18px}.ppg-docs-shell #nd-page .prose h3{font-size:20px;font-weight:500;line-height:1.4;margin:30px 0 14px}.ppg-docs-shell #nd-page .prose p{margin:16px 0}.ppg-docs-shell #nd-page .prose :is(ul,ol){padding-left:24px;margin:18px 0}.ppg-docs-shell #nd-page .prose ul{list-style:disc}.ppg-docs-shell #nd-page .prose ol{list-style:decimal}.ppg-docs-shell #nd-page .prose li{padding-left:5px;margin:8px 0}.ppg-docs-shell #nd-page .prose li::marker{color:#2855ff}.ppg-docs-shell #nd-page .prose a:not([role]){color:var(--accent);text-decoration:underline;text-underline-offset:3px}.ppg-docs-shell #nd-page .prose h2 a,.ppg-docs-shell #nd-page .prose h3 a{text-decoration:none}.ppg-docs-shell #nd-page .prose :is(th,td){padding:12px 16px;border-bottom:1px solid var(--line);text-align:left}.ppg-docs-shell #nd-page .prose th{font-weight:600;background:#edf0f5}.ppg-product-hero h1{font-size:clamp(3.3rem,5.8vw,5.2rem);font-weight:700}.ppg-product-hero .shadow-xl{box-shadow:none;border-radius:6px}.ppg-product-hero .blur-3xl{display:none}.hero-footnote,.resource-action{font-size:var(--text-label)}@media (min-width:768px){.ppg-docs-shell #nd-tocnav{top:var(--header-height)!important}}@media (max-width:760px){.footer-groups a,.footer-groups h2{font-size:var(--text-label)}}main h1.font-display{font-family:var(--font-body),sans-serif;font-weight:700;letter-spacing:-.035em;line-height:1.08}.reading-page .page-intro .display-title{font-size:clamp(2.7rem,5vw,4.4rem);line-height:1.08}.reading-page .page-intro .intro-copy{max-width:720px;font-size:var(--text-body);line-height:1.85}.reading-page .prose{font-size:var(--text-ui);line-height:1.9;color:var(--muted)}.reading-page .prose h2{font-family:var(--font-body),sans-serif;font-size:26px;font-weight:500;margin:40px 0 18px;color:var(--ink)}.reading-page .prose h3{font-size:21px;font-weight:500;margin:30px 0 14px;color:var(--ink)}.reading-page .prose p{margin:18px 0}.reading-page .prose :is(ul,ol){padding-left:24px;margin:18px 0}.reading-page .prose ul{list-style:disc}.reading-page .prose ol{list-style:decimal}.reading-page .prose li{padding-left:4px;margin:8px 0}.reading-page .prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}.reading-page>section>h2{font-size:25px;font-weight:500;letter-spacing:-.025em}.reading-page .space-y-4>div{border-radius:0;border-width:0 0 1px;padding:24px 0}@media (max-width:760px){.reading-page{padding-inline:20px}.reading-page .page-intro .intro-copy{font-size:var(--text-ui)}}.tissue-feature{display:grid;grid-template-columns:minmax(0,1.85fr) minmax(0,1fr);margin-bottom:40px;border:1px solid var(--line);background:#f6f7f9}.tissue-plate{min-width:0;margin:0;align-self:center}.tissue-plate-image{position:relative}.tissue-plate-image img{display:block;width:100%;height:auto}.tissue-sensor-labels{position:absolute;top:4%;left:25%;right:22%;display:flex;justify-content:space-between;font-family:var(--font-mono);color:#3f4d60;letter-spacing:.02em}.tissue-plate figcaption{padding:16px 24px 24px}.spectral-key{display:flex;flex-wrap:wrap;gap:10px 20px;font-family:var(--font-mono);font-size:var(--text-label);color:#394353}.spectral-key>span{display:inline-flex;align-items:center;gap:6px}.spectral-key i{width:7px;height:7px;border-radius:50%}.spectral-green{background:#23834d}.spectral-red{background:#d12e48}.spectral-ir{background:#8250ce}.tissue-plate figcaption p{max-width:630px;font-size:var(--text-label);line-height:1.7;color:var(--muted);margin-top:12px}.tissue-feature-copy{padding:40px 34px;border-left:1px solid var(--line);background:var(--surface-wash);display:flex;flex-direction:column;align-items:flex-start;justify-content:center}.tissue-feature-copy h2{font-size:clamp(2.4rem,4vw,3.6rem);font-weight:700;line-height:1.02;letter-spacing:-.055em;margin:18px 0 22px}.tissue-feature-copy>p:not(.eyebrow){font-size:var(--text-label);line-height:1.8;color:var(--muted);margin-bottom:13px}.tissue-feature-copy .text-link{margin-top:12px}.tissue-sources{font-family:var(--font-mono);font-size:var(--text-label);line-height:2;color:var(--muted);margin-top:28px;border-top:1px solid var(--line);width:100%;padding-top:15px}.tissue-sources a{display:block;width:-moz-fit-content;width:fit-content;text-decoration:underline;text-underline-offset:3px}@media (max-width:1000px){.tissue-feature{grid-template-columns:minmax(0,1.5fr) minmax(0,1fr)}.tissue-feature-copy{padding:28px 24px}.tissue-sensor-labels{font-size:var(--text-label);left:24%;right:19%}}@media (max-width:760px){.tissue-feature{grid-template-columns:1fr}.tissue-feature-copy{border-left:0;border-top:1px solid var(--line);padding:28px 24px}.tissue-feature-copy h2 br{display:none}.tissue-feature-copy h2{font-size:38px}.tissue-plate figcaption{padding:14px 18px 20px}.spectral-key{gap:10px 13px}.spectral-key,.tissue-sensor-labels{font-size:var(--text-label)}}.site-brand{font-weight:700;letter-spacing:-.045em}.site-brand>svg{color:var(--accent)}.editorial-breadcrumbs,.eyebrow,.figure-index,.footer-groups h2,.resource-index,.resource-meta,.section-number{font-family:var(--font-mono)}.eyebrow{letter-spacing:.08em;font-size:var(--text-label)}.eyebrow-dot{border-radius:0;width:6px;height:6px}.header-cta{background:var(--ink);color:white;border-color:var(--ink);border-radius:3px}.header-cta:hover{background:var(--accent);border-color:var(--accent)}.desktop-navigation a[aria-current]:after{height:2px;width:100%;left:0;bottom:0;border-radius:0}.display-title{letter-spacing:-.055em;font-weight:700;line-height:1.04}.display-title em{font-style:normal;font-weight:700}.about-story h2,.atlas-feature h2,.collection-feature h2,.evidence-note h2,.footer-brand>p,.section-heading h2,.tool-feature h2{font-weight:700;letter-spacing:-.045em}.section-heading h2{font-size:clamp(2rem,3.6vw,3.2rem)}.button-primary{border-radius:3px}.button-primary,.text-link{font-size:var(--text-label);font-weight:600}.hero-lab{padding-top:52px}.hero-lab-heading{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);gap:55px;align-items:end;padding-bottom:42px}.hero-lab h1{font-size:clamp(3.8rem,6.8vw,6.2rem);line-height:.98;letter-spacing:-.065em;margin-top:25px}.hero-lab h1 span{color:var(--accent)}.hero-lab-intro{padding-bottom:5px}.hero-lab-intro .intro-copy{max-width:410px;font-size:var(--text-ui);line-height:1.8;color:#4c586d}.hero-lab .hero-actions{gap:22px;margin-top:24px}.hero-lab-audience{margin-top:24px;font-family:var(--font-mono);font-size:var(--text-label);letter-spacing:.055em;color:var(--muted)}.metric-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-bottom:1px solid var(--line)}.metric-grid>a{padding:28px 30px 27px;border-right:1px solid var(--line);transition:background .2s;position:relative}.metric-grid>a:first-child{border-left:1px solid var(--line)}.metric-grid>a:hover{background:#f5f8ff}.metric-value{display:flex;align-items:center;justify-content:space-between;font-size:52px;line-height:1.1;letter-spacing:-.07em;font-weight:600;font-variant-numeric:tabular-nums}.metric-value>span{font-size:19px;font-weight:400;color:var(--accent)}.metric-label{margin-top:8px;font-weight:600}.metric-detail,.metric-label{display:block;font-size:var(--text-label)}.metric-detail{margin-top:6px;color:var(--muted);font-family:var(--font-mono)}.resource-grid{gap:0;border-top:1px solid var(--line);border-left:1px solid var(--line)}.resource-card{padding:22px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);transition:background .2s}.resource-card:hover{background:#f5f8ff;border-color:var(--line)}.resource-art{border-radius:3px}.resource-card:nth-child(n) .resource-art{--figure-bg:#f3f6ff;background:#f3f6ff;color:var(--accent)}.resource-body{padding:22px 0 5px}.resource-body h2{font-size:21px;font-weight:700;letter-spacing:-.035em}.resource-body p{font-size:var(--text-label)}.resource-action{padding-top:25px;font-weight:600}.resource-meta{font-size:var(--text-label);padding-top:12px;border-top:1px solid var(--line)}.about-art,.collection-feature,.research-intro-art{border-radius:6px;background:var(--surface-wash);border:1px solid var(--line)}.article-art,.article-card-body,.blog-cover,.blog-prose img{border-radius:3px}.blog-cover-caption{margin-top:10px;color:var(--muted);font-family:var(--font-mono);line-height:1.6}@media (max-width:360px){.header-cta:not(.newsletter-cta){display:none}}.article-card h3,.reading-aside h3{font-weight:700;letter-spacing:-.035em}.article-featured h3{font-size:clamp(1.8rem,3vw,2.5rem);line-height:1.15}.atlas-feature{background:var(--surface-wash);color:var(--ink);border-color:var(--panel-line);border-radius:4px}.atlas-feature .eyebrow,.atlas-feature p:not(.eyebrow){color:#4c586d}.atlas-feature .text-link{color:var(--accent);border-color:#98abdb}.atlas-index a,.atlas-index a:first-child{border-color:var(--panel-line)}.atlas-index b{font-weight:600}.atlas-index a:hover,.atlas-index b{color:var(--accent)}.stat-strip strong{font-weight:600}.tool-feature:nth-child(n) .tool-feature-art{background:#f3f6ff;--figure-bg:#f3f6ff;color:var(--accent);border-radius:3px}.footer-brand>p{max-width:360px;font-size:30px;line-height:1.2}.blog-prose blockquote{font-size:21px;font-weight:500}.blog-title,.ppg-product-hero h1,main h1.font-display{font-weight:700;letter-spacing:-.05em}.ppg-docs-shell #nd-page h1{font-weight:700;font-size:42px}@media (max-width:1000px){.hero-lab-heading{grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);gap:32px}.hero-lab h1{font-size:clamp(3.5rem,7vw,5.4rem)}.hero-lab-intro .intro-copy{font-size:var(--text-label)}.hero-lab .hero-actions{gap:15px}.hero-lab .button-primary{padding:12px 16px}.resource-card{padding:18px}.resource-body h2{font-size:19px}.metric-detail{font-size:var(--text-label)}}@media (max-width:760px){.hero-lab{padding-top:34px}.hero-lab-heading{grid-template-columns:1fr;gap:24px;padding-bottom:30px}.hero-lab h1{font-size:clamp(3.4rem,10vw,5.3rem);margin-top:20px}.hero-lab-intro .intro-copy{font-size:var(--text-ui);max-width:500px}.hero-lab-audience{margin-top:18px;font-size:var(--text-label)}.hero-lab .hero-actions{margin-top:18px}.metric-grid>a{padding:22px 16px}.metric-value{font-size:39px}.metric-label{font-size:var(--text-label);line-height:1.4}.metric-detail{display:none}.home-paths .resource-card{display:flex;padding:18px;gap:0}.home-paths .resource-art{width:100%}.home-paths .resource-body{padding:20px 0 0}.home-paths .resource-action{padding-top:22px}.home-paths{grid-template-columns:repeat(2,minmax(0,1fr))}.home-paths .resource-card:first-child{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:25px;align-items:center}.home-paths .resource-card:first-child .resource-body{padding:0}}@media (max-width:480px){.hero-lab h1{font-size:clamp(2.85rem,11vw,4.1rem)}.hero-lab .button-primary,.hero-lab .eyebrow,.hero-lab .text-link{font-size:var(--text-label)}.metric-grid>a{padding:20px 11px}.metric-value{font-size:33px}.metric-label,.metric-value>span{font-size:var(--text-label)}.home-paths{grid-template-columns:1fr}.home-paths .resource-card:first-child{display:flex;gap:0}.home-paths .resource-card:first-child .resource-body{padding-top:20px}.page-intro .display-title{font-size:42px}.ppg-docs-shell #nd-page h1,.reading-page .page-intro .display-title{font-size:36px}}.site-container{width:100%;max-width:var(--site-width);padding-inline:var(--site-gutter);margin-inline:auto}.blog-hero{max-width:none}.blog-dek{max-width:70ch;font-size:19px}.blog-meta{font-size:var(--text-label)}.blog-cover{max-height:none;aspect-ratio:16/9}.blog-cover-caption{font-size:var(--text-label)}.blog-content-wrap{max-width:none}.blog-prose>:is(p,ul,ol,h2,h3,h4,blockquote){max-width:none}.blog-prose>p:has(.article-figure-link){max-width:none}.article-figure-link{display:block;cursor:zoom-in}.article-figure-link img{width:100%;height:auto;box-shadow:none;border:1px solid var(--line)}.blog-toc-nav a,.blog-toc-toggle{font-size:var(--text-ui);line-height:1.5}.blog-toc-nav a{padding-block:8px}.ppg-docs-shell #nd-page .prose,.reading-page .prose{font-size:var(--text-body);line-height:1.8}.hero-lab-intro .intro-copy,.tissue-feature-copy>p:not(.eyebrow){font-size:var(--text-body)}.resource-body p{line-height:1.75}.button-primary,.desktop-navigation a,.resource-body p,.text-link{font-size:var(--text-ui)}.blog-kicker,.eyebrow,.hero-lab-audience,.metric-detail,.resource-meta,.spectral-key,.tissue-plate figcaption p,.tissue-sensor-labels,.tissue-sources{font-size:var(--text-label)}@media (min-width:1024px){.blog-layout{grid-template-columns:minmax(0,1fr) 300px;gap:clamp(40px,4vw,72px)}}@media (max-width:760px){:root{--site-gutter:20px}.blog-dek,.blog-prose,.hero-lab-intro .intro-copy,.ppg-docs-shell #nd-page .prose,.reading-page .prose{font-size:var(--text-body)}}.learning-art{margin:0;overflow:hidden;background:#f9fafc}.learning-art img{display:block;width:100%;height:auto;mix-blend-mode:multiply}.resource-card>.learning-art{aspect-ratio:3/2;border-bottom:1px solid var(--line)}.resource-card>.learning-art img{height:100%;-o-object-fit:contain;object-fit:contain;transition:transform .4s ease}.resource-card:hover>.learning-art img{transform:scale(1.035)}.learning-hero{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:clamp(32px,5vw,80px);align-items:center;padding-bottom:48px;border-bottom:1px solid var(--line);margin-bottom:48px}.learning-hero .page-intro{padding-bottom:0}.learning-hero>*{min-width:0}.learning-hero .display-title{overflow-wrap:anywhere;hyphens:auto}.learning-art-hero{background:transparent;padding-top:36px}.learning-art-hero figcaption{font-size:var(--text-label);color:#536178;line-height:1.7;padding:18px 12px 0;border-top:1px solid var(--line)}.learning-art-hero figcaption span{display:block;font-size:var(--text-label);margin-top:5px}.learning-reading{width:100%;min-width:0}.reading-page .learning-reading .learning-callout{background:var(--surface-wash);border:1px solid var(--line);border-radius:6px;padding:clamp(20px,3vw,32px)}.learning-reading .prose p{line-height:1.8}.learning-reading section p{font-size:var(--text-ui)}@media(max-width:800px){.learning-hero{grid-template-columns:minmax(0,1fr);gap:24px;padding-bottom:32px;margin-bottom:32px}.learning-art-hero{padding-top:0;width:100%;max-width:560px;margin-inline:auto}.learning-art-hero figcaption{padding-inline:0}}@media(prefers-reduced-motion:reduce){.resource-card>.learning-art img{transition:none}}.about-story p,.atlas-feature p:not(.eyebrow),.browser-empty p,.collection-feature p,.evidence-note p,.hero-copy .intro-copy,.hero-lab-intro .intro-copy,.home-paths .resource-body p,.intro-copy,.learning-reading section p,.resource-body p,.section-heading p:not(.eyebrow),.tissue-feature-copy>p:not(.eyebrow),.tool-feature p{font-size:var(--text-body);line-height:1.75}.blog-toc-nav a,.blog-toc-toggle,.button-primary,.collection-links a,.desktop-navigation a,.footer-groups a,.header-cta,.hero-lab .button-primary,.hero-lab .text-link,.library-search input,.metric-label,.resource-action,.text-link{font-size:var(--text-ui);line-height:1.5}.atlas-index a{font-size:var(--text-body)}.atlas-index a>span{min-width:0}.tissue-sensor-labels{gap:20px;left:20%;right:16%;line-height:1.4}.ppg-docs-shell :is(.text-xs,kbd){font-size:var(--text-label)}.ppg-docs-shell :is(.text-sm,#nd-toc,#nd-sidebar){font-size:var(--text-ui)}.ppg-docs-shell pre{font-size:var(--text-ui);line-height:1.7}@media (max-width:540px){.footer-groups{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 20px}.metric-grid{grid-template-columns:1fr}.metric-grid>a{display:grid;grid-template-columns:90px 1fr;align-items:center;gap:14px;border-left:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px}.metric-label{margin:0}.tissue-sensor-labels{position:static;padding:12px 18px 0;justify-content:space-around}.atlas-feature{padding:28px 22px}}.link-arrow{flex:0 0 18px;transition:transform .2s}.article-card-link:hover .link-arrow,.resource-card:hover .link-arrow,.text-link:hover .link-arrow{transform:translateX(3px)}@media (prefers-reduced-motion:reduce){.link-arrow{transition:none}}.tool-preview{margin:0 0 24px}.tool-preview .tool-feature-art{margin-bottom:0}.tool-preview img{display:block;width:100%;height:100%;-o-object-fit:cover;object-fit:cover}.tool-preview figcaption{padding-top:10px;font-size:var(--text-label);line-height:1.5;color:var(--muted)}@media (min-width:761px) and (max-width:1150px){.footer-top{grid-template-columns:1fr;gap:40px}}@media (min-width:541px) and (max-width:760px){.footer-groups{grid-template-columns:repeat(2,minmax(0,1fr))}}.header-cta.newsletter-cta{background:var(--accent);border-color:var(--accent);color:#fff;min-height:44px;gap:8px;white-space:nowrap}.header-cta.newsletter-cta:hover{background:#1942dd;border-color:#1942dd}.newsletter-cta-short{display:none}.newsletter-panel{background:var(--surface-wash);border:1px solid var(--line);border-radius:6px;padding:clamp(20px,3vw,32px);min-width:0}.hero-newsletter{scroll-margin-top:calc(var(--header-height) + 28px)}.hero-newsletter>.eyebrow{margin-bottom:14px;color:var(--accent)}.hero-lab-intro.hero-newsletter .intro-copy{max-width:none;font-size:18px;line-height:1.65}.hero-lab-heading:has(.hero-newsletter){align-items:center;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr)}.footer-newsletter{display:inline-flex;margin-top:22px;color:#b8cbff;font-weight:600;text-underline-offset:5px}.footer-newsletter:hover{color:white;text-decoration:underline}@media (max-width:1050px){.site-header-inner{gap:20px}.desktop-navigation{gap:22px}.header-actions{gap:14px}}@media (max-width:760px){.hero-lab-heading:has(.hero-newsletter){grid-template-columns:1fr}.newsletter-cta-full{display:none}.newsletter-cta-short{display:inline}.header-cta.newsletter-cta .link-arrow{display:none}}@media (max-width:360px){.site-header-inner{gap:8px}.header-actions{gap:6px}.header-cta.newsletter-cta{padding:9px 8px}.site-brand{font-size:19px;gap:5px}}.popular-guides-head h2{font-size:clamp(26px,3vw,36px);font-weight:500;letter-spacing:-.03em;line-height:1.15;margin-top:12px}.popular-guides{list-style:none;margin:32px 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));-moz-column-gap:48px;column-gap:48px;border-top:1px solid var(--line)}.popular-guides li{border-bottom:1px solid var(--line);min-width:0}.popular-guides a{display:flex;flex-direction:column;gap:6px;padding:16px 0;color:var(--ink);text-decoration:none}.popular-guides a:focus-visible .popular-guides-title,.popular-guides a:hover .popular-guides-title{color:var(--accent);text-decoration:underline;text-underline-offset:3px}.popular-guides .eyebrow{font-size:var(--text-label)}.popular-guides-title{font-size:17px;line-height:1.4;letter-spacing:-.015em;overflow-wrap:anywhere}@media (max-width:760px){.popular-guides{grid-template-columns:1fr}.popular-guides-title{font-size:16px}}.article-card h3,.blog-prose,.display-title,.reading-page,.research-record,.resource-body h2{overflow-wrap:anywhere}.ppg-docs-shell #nd-page h1{line-height:1.15;overflow-wrap:anywhere}.ppg-docs-shell #nd-page .prose{overflow-wrap:anywhere}.research-record-section-heading{flex-wrap:wrap;align-items:flex-start}.research-record-section-heading h2{min-width:0}.research-record-section-heading h2>span{flex-shrink:0}.research-record-properties{grid-template-columns:112px minmax(0,1fr)}@media (max-width:760px){.mobile-menu-button{min-width:44px;min-height:44px}.mobile-navigation{max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding-bottom:max(24px,env(safe-area-inset-bottom))}.mobile-navigation a>span{min-width:0}.mobile-navigation svg{flex-shrink:0}.footer-groups a{min-height:44px;display:flex;align-items:center}.footer-groups h2{overflow-wrap:anywhere}.tools-grid{grid-template-columns:minmax(0,1fr);gap:36px}.library-topic select{font-size:16px}.blog-prose>table{min-width:0;max-width:100%}.ppg-docs-shell #nd-page h1{font-size:clamp(30px,5vw,42px)}.ppg-product-hero h1{font-size:clamp(40px,8vw,54px);line-height:1.08}}@media (max-width:600px){.resource-grid:not(.home-paths){grid-template-columns:minmax(0,1fr)}}@media (max-width:420px){.research-record-properties{grid-template-columns:minmax(0,1fr);gap:4px;padding-block:14px}.tool-links{align-items:stretch;gap:16px}.tool-links .button-primary{width:100%;justify-content:center}}@media (max-width:760px){.dataset-directory :is(select,input:not([type=checkbox])),.dataset-lead-form :is(select,input:not([type=checkbox])){font-size:16px;min-height:48px}}@media (min-width:761px) and (max-width:1000px){.article-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-lab-heading:has(.hero-newsletter){grid-template-columns:minmax(0,1fr)}}.wc-signup{position:relative;isolation:isolate;overflow:hidden;background-color:var(--paper)}.wc-signup:before{z-index:-2;background-image:var(--wc-signup-art);background-size:cover;background-position:100%}.wc-signup:after,.wc-signup:before{content:"";position:absolute;inset:0;pointer-events:none}.wc-signup:after{z-index:-1;background:linear-gradient(90deg,rgba(247,248,250,.82),rgba(247,248,250,.62) 55%,rgba(247,248,250,.3))}.wc-signup--a{--wc-signup-art:url(/images/signup/watercolor-a.webp)}.wc-signup--b{--wc-signup-art:url(/images/signup/watercolor-b.webp)}.wc-signup--c{--wc-signup-art:url(/images/signup/watercolor-c.webp)}html.dark .wc-signup{background-color:#0b1220}html.dark .wc-signup:before{opacity:.5;filter:saturate(.8)}html.dark .wc-signup:after{background:linear-gradient(90deg,rgba(11,18,32,.93),rgba(11,18,32,.86) 60%,rgba(11,18,32,.74))}@media (max-width:640px){.wc-signup:after{background:rgba(247,248,250,.8)}html.dark .wc-signup:after{background:rgba(11,18,32,.9)}.wc-signup:before{background-position:85%}}.wc-signup{--muted:#475266;--accent:#1f46e6}.wc-signup .intro-copy{color:var(--muted)}.wc-signup .text-slate-500,.wc-signup .text-slate-600{color:#475266}.wc-signup .text-red-500{color:#c81e1e}.wc-signup .text-primary{color:#1f46e6}html.dark .wc-signup{--muted:#b7c2d6;--accent:#9db4ff;--ink:#f2f5fa}html.dark .wc-signup .intro-copy,html.dark .wc-signup .text-slate-400,html.dark .wc-signup .text-slate-500,html.dark .wc-signup .text-slate-600{color:#b7c2d6}html.dark .wc-signup .text-primary{color:#9db4ff}html.dark .wc-signup .text-red-500{color:#fca5a5}html.dark .wc-signup .button-primary,html.dark .wc-signup button.bg-primary{background:#2855ff;border-color:#2855ff;color:#fff}.tool-wash{position:relative;isolation:isolate}.tool-wash:before{content:"";position:absolute;inset:0 -1rem;z-index:-1;border-radius:0 0 2rem 2rem;background:radial-gradient(60% 70% at 12% 20%,rgba(125,182,222,.28),transparent 70%),radial-gradient(45% 60% at 88% 30%,rgba(240,196,160,.26),transparent 70%),radial-gradient(55% 60% at 55% 95%,rgba(160,206,186,.22),transparent 70%);filter:blur(2px);pointer-events:none}.dark .tool-wash:before{background:radial-gradient(60% 70% at 12% 20%,rgba(56,120,170,.22),transparent 70%),radial-gradient(45% 60% at 88% 30%,rgba(150,96,64,.18),transparent 70%),radial-gradient(55% 60% at 55% 95%,rgba(60,120,100,.16),transparent 70%)}:root{--button-radius:4px;--button-hover:#1942dd}.button-primary,.button-quiet,.button-secondary{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;max-width:100%;padding:12px 20px;border:1px solid transparent;border-radius:var(--button-radius);font-size:16px;font-weight:600;line-height:1.35;text-align:center;text-decoration:none;overflow-wrap:anywhere;box-shadow:none;transition:background-color .18s,border-color .18s,color .18s}.button-primary{background:#2855ff;border-color:#2855ff;color:#fff}.button-primary:not(:disabled):hover{background:var(--button-hover);border-color:var(--button-hover);color:#fff}.button-secondary{background:#fff;border-color:#ccd6e7;color:#26364e}.button-secondary:not(:disabled):hover{background:#f1f5ff;border-color:#2855ff;color:#1942dd}.button-quiet{background:transparent;color:#26364e}.button-quiet:not(:disabled):hover{background:#edf2ff;color:#1942dd}.button-quiet[aria-pressed=true],.button-secondary[aria-pressed=true]{background:#eaf0ff;border-color:#9db4ff;color:#1942dd}.button-compact{min-height:44px;padding:10px 14px}.button-icon{width:44px;min-width:44px;padding:10px}:is(.button-primary,.button-secondary,.button-quiet)>svg{flex-shrink:0}:is(.button-primary,.button-secondary,.button-quiet):focus-visible{outline:2px solid #2855ff;outline-offset:3px}:is(.button-primary,.button-secondary,.button-quiet):disabled{opacity:.55;cursor:not-allowed}:is(.button-primary,.button-secondary,.button-quiet):active{transform:none}.header-cta.newsletter-cta{border-radius:var(--button-radius);line-height:1.35}.text-link{min-height:44px;gap:8px;white-space:normal;line-height:1.4}.mobile-demo-cta{display:flex}@media (min-width:1024px){.mobile-demo-cta{display:none}}@media (prefers-reduced-motion:reduce){.button-primary,.button-quiet,.button-secondary{transition:none}}@font-face{font-family:sans;src:url(/_next/static/media/13971731025ec697-s.p.woff2) format("woff2");font-display:swap;font-weight:400 700}@font-face{font-family:sans Fallback;src:local("Arial");ascent-override:94.36%;descent-override:29.49%;line-gap-override:0.00%;size-adjust:105.13%}.__className_27fb90{font-family:sans,sans Fallback}.__variable_27fb90{--font-body:"sans","sans Fallback"}