.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}
.brand-art{display:block;width:225px;height:62px}.brand-art svg{display:block;width:100%;height:100%}.brand .eyebrow{display:none}.logo-dark{display:none!important}[data-theme=dark] .logo-light{display:none}[data-theme=dark] .logo-dark{display:block!important}.brand-art{mix-blend-mode:multiply}[data-theme=dark] .brand-art{mix-blend-mode:normal}.footer-links{display:flex;flex-wrap:wrap;gap:14px;font-size:12px}
.mega-columns{columns:auto;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 24px}.mega-columns>div{margin:0}.nav-node{position:relative;min-width:0;border-bottom:1px solid var(--line)}.nav-node>a{display:block;padding:13px 52px 13px 8px!important;color:var(--ink);font-size:13px!important;line-height:1.5}.nav-node>details>summary{position:absolute;right:2px;top:4px;display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--line);border-radius:10px;font-size:22px;cursor:pointer;background:var(--surface)}.nav-node>details>summary:before{content:'+'}.nav-node>details[open]>summary:before{content:'−'}.nav-children{padding:0 0 10px 16px;border-left:2px solid var(--line);margin:0 8px 8px}.nav-children .nav-node>a{font-size:12px!important}.mega-panel{max-height:min(70vh,620px);overscroll-behavior:contain}.mega-close{border:0;background:var(--soft);color:var(--ink);border-radius:8px;padding:7px 12px;cursor:pointer}.mega-top{align-items:center}.header-links{gap:20px}.mega-quick{display:flex;gap:18px;flex-wrap:wrap;margin:0 0 15px;font-size:13px}
.learning-strip{display:grid;grid-template-columns:1fr 1.25fr;gap:30px;padding:30px;margin:30px auto;border:1px solid var(--line);border-radius:24px;background:var(--soft)}.learning-strip h2{font-size:25px;margin:10px 0}.learning-strip p{font-size:14px;color:var(--muted)}.learning-links{display:grid;gap:10px}.learning-links a{display:flex;gap:12px;align-items:center;padding:12px 16px;border-radius:12px;background:var(--surface);border:1px solid var(--line);font-size:14px}.learning-links a:hover{border-color:var(--blue)}.learning-links a span{color:var(--blue);font-size:20px}.learning-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:30px 0 60px}.learning-card{display:flex;flex-direction:column;gap:8px}.learning-card h2{font-size:22px}.learning-card p{font-size:14px;color:var(--muted)}.learning-card .text-link{margin-top:auto}.guide-symbol{display:grid;place-items:center;width:48px;height:48px;border-radius:14px;background:#ddebff;color:#164faf}.guide-symbol svg{width:28px;height:28px}.learning-article{max-width:1050px;padding-top:32px;padding-bottom:60px}.learning-article h1{max-width:820px;font-size:clamp(32px,4.5vw,56px);line-height:1.12;margin:15px 0 24px}.guide-intro{max-width:820px;font-size:20px;line-height:1.7;color:var(--muted)}.learning-figure{margin:30px 0}.learning-figure svg{display:block;width:100%;height:auto}.learning-figure figcaption{font-size:12px;margin-top:8px;color:var(--muted)}.lesson-sections{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:25px 0}.lesson-sections .panel{padding:24px}.lesson-sections h2{font-size:23px;margin:10px 0}.lesson-sections p{line-height:1.8}.lesson-number{font-size:13px;letter-spacing:.12em;font-weight:800;color:var(--blue)}.lesson-caution{background:var(--soft)}.learning-article>.panel{margin:24px 0}.display-explainer{display:grid;grid-template-columns:1fr 1fr;gap:20px}.display-explainer section{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:22px}.display-explainer h3{font-size:18px}.display-explainer p{font-size:14px;color:var(--muted)}.light-zones{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:15px;background:#101d40;border-radius:12px}.light-zones i{height:74px;background:radial-gradient(#e0f8ff,#3586ce);border-radius:8px}.pixel-filter{border:1px solid #3586ce;text-align:center;color:#1b5181;background:#e0f8ff;margin:8px 0;padding:9px;border-radius:9px}.self-pixels{display:grid;grid-template-columns:repeat(8,1fr);gap:5px;padding:15px;background:#101d40;border-radius:12px}.self-pixels i{aspect-ratio:1;background:#182a44;border:1px solid #345;max-height:22px}.self-pixels .lit{background:#cafa30;box-shadow:0 0 5px #ccff6860}.evidence-panel{margin:25px 0}.evidence-panel li{margin:16px 0}.evidence-panel li p{margin:6px 0}.ops-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;margin:20px 0}.ops-grid .panel{padding:20px}.ops-grid b{display:block;font-size:28px}.ops-table td{vertical-align:top}.ops-table pre{white-space:pre-wrap;max-width:450px}.ad-slot{margin:30px auto;max-width:970px;min-height:140px;border:1px dashed var(--line);border-radius:16px;display:grid;place-items:center;text-align:center;padding:18px}.ad-slot span{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.ad-slot img{max-height:250px;object-fit:contain;width:100%}.plan-state{font-size:13px;color:var(--muted)}
.product-photo img,.category-visual img,.detail-visual img{object-fit:contain!important;max-width:100%;max-height:100%}.teaser:hover img{transform:none}.admin-nav{max-width:250px}.admin-list>a{display:block;padding:10px;border-bottom:1px solid var(--line)}
@media(prefers-color-scheme:dark){html:not([data-theme=light]) .logo-light{display:none}html:not([data-theme=light]) .logo-dark{display:block!important}html:not([data-theme=light]) .brand-art{mix-blend-mode:normal}}
@media(max-width:850px){.learning-grid{grid-template-columns:1fr 1fr}.header-links{gap:12px}.brand-art{width:175px}.learning-strip{grid-template-columns:1fr}.ops-grid{grid-template-columns:1fr 1fr}.header-links>.desktop-link{display:none}.mega-panel{left:3%;right:3%;padding:18px}.learning-figure{overflow:auto}.learning-figure svg{min-width:600px}.mega-columns{grid-template-columns:1fr}}
@media(max-width:560px){.brand-art{width:148px;height:48px}.learning-grid,.lesson-sections,.display-explainer,.ops-grid{grid-template-columns:1fr}.learning-strip{padding:20px}.mega-top .eyebrow{display:none}.mega-panel{max-height:72vh}.header-inner{gap:8px}.header-links{gap:9px}.learning-article h1{font-size:34px}.footer-inner{align-items:start}.footer-links{margin-top:16px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;scroll-behavior:auto!important;transition:none!important}}
.mega-columns{display:block;columns:2;column-gap:24px}.mega-columns>.nav-node{break-inside:avoid;margin:0 0 8px}.nav-node>details>summary{padding:0!important;line-height:1;list-style:none}.nav-node>details>summary::-webkit-details-marker{display:none}.nav-node>details>summary:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
@media(max-width:850px){.mega-columns{columns:1}}

.brand-art .logo-lockup{height:100%;position:relative}.brand-art .logo-lockup svg{width:34%;height:100%;position:absolute;left:0;top:0}.brand-wordmark{position:absolute;left:35%;top:50%;transform:translateY(-50%);font:900 28px/1 Arial,sans-serif;letter-spacing:-1.2px;color:#fff;white-space:nowrap}.brand-wordmark>span{font-size:17px;letter-spacing:-.7px}.mega-panel{left:auto;width:min(900px,92vw);right:4%}
@media(max-width:850px){.brand-wordmark{font-size:22px;letter-spacing:-1px}.brand-wordmark>span{font-size:13px}.mega-panel{right:3%;width:94%}}
@media(max-width:560px){.brand-wordmark{font-size:18px;letter-spacing:-.8px}.brand-wordmark>span{font-size:11px}}

.learning-home{padding-top:20px;padding-bottom:60px}.learning-heading{display:flex;align-items:center;justify-content:space-between;gap:32px;margin:30px 0}.learning-heading h1{font-size:clamp(30px,4vw,50px);line-height:1.12;margin:14px 0}.learning-heading p{max-width:750px;color:var(--muted);font-size:17px}.learning-art{display:block;width:100%;height:auto}.family-hero-art{width:260px;flex-shrink:0}.learning-search{display:flex;align-items:stretch;gap:10px;max-width:650px;margin:25px 0}.learning-search input{flex:1;min-width:0;width:0;padding:14px 18px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px}.learning-search button{flex-shrink:0}.learning-family-card{padding:0;overflow:hidden}.learning-family-card .learning-art{border-radius:0}.learning-family-card>div{padding:24px}.learning-family-card h2{font-size:23px;margin:10px 0}.learning-family-card p{min-height:48px;font-size:14px;color:var(--muted)}.learning-family-card:hover{border-color:var(--blue)}.lesson-directory{display:grid;gap:18px;margin:30px 0}.lesson-directory-card{display:grid;grid-template-columns:1fr 240px;gap:25px;padding:25px}.lesson-directory h2{font-size:25px;margin:0 0 10px}.lesson-directory p{color:var(--muted);max-width:760px}.lesson-topics{display:flex;flex-direction:column;gap:10px;justify-content:center}.lesson-topics>span{padding:10px 14px;background:var(--soft);border-radius:10px;font-size:12px}.lesson-art{width:260px;float:right;margin:0 0 20px 25px}.learning-figure{clear:both}
@media(max-width:760px){.learning-heading{align-items:start}.family-hero-art{width:160px}.lesson-directory-card{grid-template-columns:1fr}.lesson-topics{flex-direction:row;flex-wrap:wrap}.lesson-topics>span{font-size:11px}.lesson-art{float:none;margin:25px 0;width:100%;max-width:400px}}
@media(max-width:560px){.learning-heading{display:block}.family-hero-art{width:100%;max-width:340px;margin-top:20px}.learning-search{gap:7px}.learning-search input{padding:12px;font-size:13px}.learning-search button{padding:12px;font-size:12px}}
/* Guides: introductions before details, optional help after the catalogue. */
.learning-more{display:grid;grid-template-columns:1fr auto;align-items:center;gap:14px 24px;margin:40px 0 24px;padding:22px 0;border-top:1px solid var(--line)}.learning-more>div>strong{display:block;font-size:18px}.learning-more>div>span{display:block;font-size:13px;color:var(--muted);margin-top:5px}.learning-more-universes{display:flex;gap:15px;flex-wrap:wrap;font-size:14px}.learning-more>details{grid-column:1/-1;font-size:13px}.learning-more summary,.lesson-summary summary{cursor:pointer;padding:8px 0;color:var(--ink)}.learning-more .learning-links{grid-template-columns:repeat(2,minmax(0,1fr));margin-top:14px}.learning-more summary:focus-visible,.lesson-summary summary:focus-visible{outline:2px solid var(--blue);outline-offset:4px}.lesson-foundation{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:32px;align-items:start;margin:28px 0}.lesson-foundation .lesson-art{float:none;grid-column:2;grid-row:1;width:100%;margin:0}.lesson-basics{grid-column:1;grid-row:1}.lesson-basics h2{font-size:25px;margin:0 0 12px}.lesson-basics section+section{margin-top:25px}.lesson-basics p{font-size:16px;line-height:1.85;margin:0}.lesson-summary{padding:10px 18px;background:var(--soft);border:1px solid var(--line);border-radius:12px;margin:26px 0}.lesson-summary ol{columns:2;column-gap:35px;padding-left:24px}.lesson-summary li{break-inside:avoid;margin-bottom:10px;font-size:14px;line-height:1.5}.lesson-summary a:hover{text-decoration:underline}.lesson-sections>section{scroll-margin-top:120px}.lesson-table{overflow:auto;border:1px solid var(--line);border-radius:16px;margin:26px 0;background:var(--surface)}.lesson-table table{width:100%;border-collapse:collapse;font-size:14px;line-height:1.65}.lesson-table caption{text-align:left;font-weight:700;font-size:20px;padding:20px}.lesson-table th,.lesson-table td{text-align:left;vertical-align:top;padding:15px 20px;border-top:1px solid var(--line)}.lesson-table thead{background:var(--soft)}.lesson-table th[scope=row]{min-width:115px}.lesson-related{margin:30px 0}.lesson-related .learning-links{grid-template-columns:1fr 1fr}.concept-figure{border-radius:24px}.learning-article .two-col{margin-top:24px}
@media(max-width:760px){.lesson-foundation{grid-template-columns:1fr;gap:22px}.lesson-foundation .lesson-art{grid-column:1;grid-row:1;max-width:340px}.lesson-basics{grid-column:1;grid-row:2}.lesson-summary ol{columns:1}.learning-more{grid-template-columns:1fr}.learning-more .learning-links,.lesson-related .learning-links{grid-template-columns:1fr}.lesson-table table{min-width:560px}}