:root{--paper:#f5f0e6;--paper2:#eee7d9;--ink:#252b27;--muted:#76766d;--line:#d6cbbb;--accent:#a74432;--card:#fbf8f1;--shadow:0 20px 60px #30271c0e;color-scheme:light}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.8;transition:background .25s,color .25s}body.dark{--paper:#1e2422;--paper2:#292e2b;--ink:#e7dfcf;--muted:#aaa99f;--line:#48504a;--accent:#dc8c74;--card:#252b28;--shadow:0 20px 60px #0003;color-scheme:dark}.grain{pointer-events:none;position:fixed;inset:0;z-index:10;opacity:.13;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 120 120' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' opacity='.25' 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p,.contact-inner>p{color:var(--muted);font-size:14px}.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center}.quote-panel{background:var(--paper2);padding:48px 54px;min-height:340px;position:relative;border:1px solid var(--line)}.quote-mark{font:90px/1 Georgia,serif;color:var(--accent);opacity:.5}.quote-panel blockquote{font-size:26px;line-height:2;letter-spacing:3px;margin:-10px 0 20px}.quote-credit{color:var(--muted);font-size:12px}.about-text h3{font-size:29px;font-weight:500}.about-text p{font-size:15px;color:var(--muted);line-height:2.2}.tags{display:flex;gap:9px;flex-wrap:wrap;margin-top:25px}.tags span{font-size:12px;border:1px solid var(--line);padding:3px 13px}.parchment{background:var(--paper2)}.filters{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;margin-bottom:20px}.search-wrap{border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;min-width:240px}.search-wrap span{font-size:25px}.search-wrap input{background:transparent;border:0;outline:0;padding:10px 0;color:var(--ink);width:100%;font-size:13px}.chips{display:flex;gap:8px}.chips button{border:1px solid var(--line);background:transparent;color:var(--ink);padding:6px 15px;font-size:12px}.chips button.active{background:var(--ink);color:var(--paper)}.article-list{display:grid;gap:12px}.article-item{display:grid;grid-template-columns:110px 1fr 90px 22px;gap:22px;align-items:center;background:var(--card);border:1px solid var(--line);padding:26px 30px;text-align:left;color:var(--ink);width:100%}.article-item:hover{border-color:var(--accent)}.article-date,.article-meta{color:var(--muted);font-size:12px}.article-title{font:21px serif}.article-desc{display:block;font:12px/1.8 system-ui;color:var(--muted);margin-top:5px}.article-arrow{color:var(--accent);font-size:22px}.hint{font-size:12px;color:var(--muted);margin-top:24px}.project-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.project-card{background:var(--card);border:1px solid var(--line);padding:34px;min-height:315px;display:flex;flex-direction:column;align-items:flex-start}.project-icon{font-size:34px;color:var(--accent)}.project-type{font-size:11px;letter-spacing:2px;color:var(--muted);margin-top:18px}.project-card h3{font-size:24px;font-weight:500;margin:9px 0}.project-card p{font-size:13px;color:var(--muted);line-height:2}.project-card a{margin-top:auto;font-size:13px;color:var(--accent)}.contact-section{background:var(--paper2);text-align:center}.contact-inner{max-width:780px}.contact-links{display:flex;gap:15px;justify-content:center;flex-wrap:wrap;margin-top:40px}.contact-links a,.contact-links button{padding:14px 21px;min-width:175px;border:1px solid var(--line);background:var(--card);color:var(--ink);font-size:13px;text-align:left}.contact-links span{float:right;color:var(--accent)}.contact-note{font-size:11px!important;margin-top:20px}.footer{border-top:1px solid var(--line);padding:24px 0}.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:16px;font-size:12px;color:var(--muted)}.footer-brand{font:22px serif;color:var(--ink)}.footer-brand small{font-size:12px;color:var(--muted)}.article-dialog{border:1px solid var(--line);background:var(--card);color:var(--ink);padding:45px;width:min(660px,calc(100% - 28px));max-height:85vh;box-shadow:var(--shadow)}.article-dialog::backdrop{background:#141b17aa;backdrop-filter:blur(4px)}.article-dialog h2{font-size:30px}.article-dialog p{line-height:2.2}.close-dialog{float:right;border:0;background:transparent;color:var(--ink);font-size:30px}.empty{text-align:center;padding:45px;color:var(--muted)}@media(max-width:850px){.hero{grid-template-columns:1fr 1fr;gap:15px}.hero-side{display:none}h1{font-size:48px}.landscape{height:380px}.about-grid{gap:25px}.project-grid{grid-template-columns:1fr 1fr}.project-card:last-child{grid-column:1/-1}}@media(max-width:650px){.wrap{width:min(100% - 32px,1120px)}.nav{height:70px}.brand strong{font-size:20px}.menu-toggle{display:block;border:0;background:transparent;color:var(--ink);font-size:25px}nav{display:none;position:absolute;top:70px;left:0;right:0;background:var(--paper);padding:22px;flex-direction:column;align-items:stretch;gap:13px;border-bottom:1px solid var(--line)}nav.open{display:flex}nav a{padding:8px}.hero{grid-template-columns:1fr;padding-top:55px;padding-bottom:40px;min-height:0}.hero h1{font-size:clamp(40px,10vw,57px);margin:15px 0}.hero-note{margin-top:35px}.landscape{height:260px}.sun{width:80px;height:80px;top:30px}.mountain{height:190px;bottom:40px}.ribbon{font-size:11px;letter-spacing:1px}.ribbon span{margin:0 5px}.section{padding-top:75px;padding-bottom:75px}.section-heading h2,.contact-inner h2{font-size:32px}.about-grid,.project-grid{grid-template-columns:1fr}.project-card:last-child{grid-column:auto}.quote-panel{padding:28px;min-height:0}.quote-panel blockquote{font-size:23px}.article-item{grid-template-columns:1fr 22px;gap:8px;padding:20px}.article-date,.article-meta{grid-column:1}.article-title{grid-column:1}.article-arrow{grid-column:2;grid-row:1/4}.footer-inner{flex-direction:column;text-align:center}.article-dialog{padding:25px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
/* Independent pages and editorial layouts */
[hidden]{display:none!important}.skip{position:fixed;top:-80px;left:20px;z-index:100;background:var(--ink);color:var(--paper);padding:10px 20px}.skip:focus{top:10px}:focus-visible{outline:2px solid var(--accent);outline-offset:5px}nav a[aria-current=page]{color:var(--accent);text-decoration:underline;text-underline-offset:8px}.page-intro{padding:85px 0 48px;border-bottom:1px solid var(--line)}.page-intro h1{font-size:clamp(36px,4.8vw,64px);margin:20px 0;letter-spacing:3px}.page-intro p{max-width:720px;color:var(--muted);font-size:16px}.content-section{padding-top:45px;padding-bottom:95px;min-height:40vh}.project-index{font:12px system-ui;color:var(--accent);letter-spacing:2px}.project-stack{font-size:11px;color:var(--muted);margin:8px 0 22px}.card-link{margin-top:auto;color:var(--accent);font-size:13px}.project-card{transition:border-color .2s,transform .2s}.project-card:hover{border-color:var(--accent);transform:translateY(-3px)}.project-card h3{font-size:25px}.text-link{display:inline-block;color:var(--accent);margin-top:25px;font-size:14px}.editor-note{font-size:12px;color:var(--muted);border-left:2px solid var(--accent);padding-left:15px;margin:25px 0}.closing h2{font-size:clamp(30px,4vw,45px);font-weight:500;line-height:1.8}.closing p{color:var(--muted)}.breadcrumbs{padding-top:35px;font-size:12px;color:var(--muted)}.breadcrumbs a:hover{color:var(--accent)}.detail-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:70px;padding-top:50px;padding-bottom:100px}.detail-aside{font-size:13px;color:var(--muted)}.detail-aside .eyebrow{letter-spacing:2px}.prose{max-width:720px}.prose h2{font-size:26px;font-weight:500;margin:0 0 20px}.prose h3{font-size:18px;font-weight:500}.prose p{line-height:2.2;margin-bottom:26px;color:var(--muted)}.prose section{margin-bottom:50px;scroll-margin-top:110px}.scope-note{padding:22px 28px;background:var(--paper2);border-left:2px solid var(--accent);margin:35px 0}.scope-note p{margin-bottom:0;font-size:14px}.toc{display:flex;flex-direction:column;gap:16px;align-items:flex-start;margin-top:25px}.toc a{letter-spacing:0;font-size:13px}.reading-progress{position:fixed;top:0;left:0;height:3px;background:var(--accent);z-index:50;width:0}.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:35px}.principles>div{border-top:1px solid var(--line);padding-top:20px}.principles span{color:var(--accent);font:32px Georgia,serif}.principles h3{font-weight:500}.principles p{font-size:14px;color:var(--muted)}.contact-layout{display:grid;grid-template-columns:1fr 1fr;gap:25px}.contact-panel{background:var(--card);border:1px solid var(--line);padding:40px}.contact-panel h2{font-size:30px;font-weight:500}.contact-panel p{color:var(--muted);font-size:14px;margin-bottom:25px}.contact-panel .btn{display:inline-block;background:transparent;color:var(--ink)}.contact-panel .primary{background:var(--ink);color:var(--paper)}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
@media(max-width:850px){.detail-layout{grid-template-columns:190px minmax(0,1fr);gap:35px}.project-grid .project-card:last-child{grid-column:auto}.hero h1{font-size:45px}nav{gap:20px}}
@media(max-width:650px){.page-intro{padding-top:50px;padding-bottom:30px}.page-intro h1{font-size:36px}.detail-layout,.contact-layout,.principles{grid-template-columns:1fr}.detail-layout{gap:35px;padding-bottom:60px}.detail-aside{border-bottom:1px solid var(--line);padding-bottom:25px}.toc{position:static;background:transparent;padding:0;border:0;gap:10px}.contact-panel{padding:25px}.project-card{min-height:285px}.content-section{padding-bottom:60px}.eyebrow{letter-spacing:2px}}
/* Directory, reading controls and print layout */
.footer-links{display:flex;gap:20px;flex-wrap:wrap;justify-content:center}.chips{flex-wrap:wrap}.project-grid,.hero-copy,.about-text{min-width:0}.project-card p,.about-text p{overflow-wrap:anywhere}.search-wrap:focus-within{border-color:var(--accent)}.page-turn{display:grid;grid-template-columns:1fr 1fr;position:static;background:transparent;border-top:1px solid var(--line);gap:25px;padding:26px 0 0;margin-top:45px}.page-turn a{font-size:17px;letter-spacing:0}.page-turn a:last-child{text-align:right}.page-turn small{display:block;font:12px/2 system-ui;color:var(--muted);margin-bottom:10px}.reading-tools{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:35px}.reading-tools .hint{margin:0}.toc a[aria-current=location]{color:var(--accent);border-left:2px solid var(--accent);padding-left:10px}.archive-groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px}.archive-groups h2{font-size:25px;font-weight:500}.archive-groups ul{list-style:none;padding:0}.archive-groups li{border-bottom:1px solid var(--line)}.archive-groups a{display:flex;justify-content:space-between;gap:18px;padding:16px 0;font-size:14px}.archive-groups a:hover{color:var(--accent)}.archive-groups a span{color:var(--accent)}
@media(min-width:851px){.detail-aside{position:sticky;top:115px;align-self:start}}
@media(max-width:650px){.archive-groups{grid-template-columns:1fr;gap:24px}.page-turn{display:grid;grid-template-columns:1fr;gap:25px}.page-turn a:last-child{text-align:left}.footer-links{gap:16px}.ribbon .wrap{line-height:2}.reading-tools .theme{min-height:42px}}
@media print{.site-header,.footer,.grain,.reading-tools,.reading-progress,.detail-aside,.skip,.page-turn{display:none!important}body,body.dark{background:white;color:#111;--muted:#333;--paper2:#f4f4f4;--line:#ccc;--accent:#555}.wrap{width:100%}.page-intro{padding:0 0 20px}.page-intro h1{font-size:28pt}.detail-layout{display:block;padding:25px 0}.prose{max-width:none}.scope-note{break-inside:avoid}.prose h2{break-after:avoid}.breadcrumbs{padding:0}.prose p{line-height:1.8}a{color:inherit}.content-section{padding:20px 0}}
/* Browser laboratory */
.lab-overview{display:grid;grid-template-columns:1.2fr 1fr;gap:60px;margin-bottom:55px}.lab-overview h2{font-weight:500;font-size:32px}.lab-overview p,.lab-explainer p{font-size:14px;line-height:2.1;color:var(--muted)}.lab-facts{border-block:1px solid var(--line)}.lab-facts>span{display:block;padding:14px 0;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}.lab-facts>span:last-child{border:0}.lab-facts strong{display:block;color:var(--ink);font-size:15px;font-weight:500}.lab-console{border:1px solid var(--line);background:var(--card);padding:30px;margin-bottom:50px}.lab-console-heading{display:flex;justify-content:space-between;gap:15px;align-items:center}.lab-console h2{font-size:26px;font-weight:500;margin:0}.lab-badge{color:var(--accent);font-size:11px;border:1px solid var(--accent);padding:3px 10px;white-space:nowrap}.lab-checks{display:flex;gap:10px 22px;flex-wrap:wrap;list-style:none;padding:0;font-size:12px}.check-ok{color:var(--ink)}.check-missing{color:var(--accent)}.lab-actions{display:flex;gap:12px;flex-wrap:wrap;margin:25px 0}.lab-actions button:disabled{opacity:.45;cursor:not-allowed;transform:none}.vm-screen{background:#18201c;color:#d8e5d6;min-height:180px}.vm-screen>p{padding:35px 25px;font-size:13px}.vm-screen iframe{width:100%;height:390px;border:0;display:block}.lab-explainer{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}.lab-explainer h2{font-size:22px;font-weight:500}
@media(min-width:651px){#menu{gap:20px}#menu a{letter-spacing:1px}}@media(max-width:850px) and (min-width:651px){.brand small{font-size:8px;letter-spacing:0}.brand{gap:8px}.brand strong{font-size:21px}#menu{gap:13px}#menu a{letter-spacing:0}.theme{padding:6px 8px}}
@media(max-width:650px){.lab-overview,.lab-explainer{grid-template-columns:1fr;gap:25px}.lab-console{padding:20px 15px}.lab-console h2{font-size:22px}.lab-actions .btn{width:100%;min-height:44px}.lab-checks{display:grid;gap:8px}.vm-screen iframe{height:340px}}
.boot-evidence{border:1px solid var(--line);padding:18px 24px;margin:0 0 30px;background:var(--paper2)}.boot-evidence summary{cursor:pointer;font-size:14px;color:var(--accent)}.boot-evidence p{font-size:13px;color:var(--muted)}.boot-evidence pre{font-size:12px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.8}
.vm-screen iframe{height:850px}.lab-overview h2{line-height:1.6}.lab-console:has(iframe){overflow:clip}.lab-console:fullscreen{background:var(--paper)}

/* Shared site network */
.domain-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.domain-card{padding:30px 25px;border:1px solid var(--line);background:var(--card);display:flex;flex-direction:column;align-items:flex-start}.domain-card h2{font-size:30px;font-weight:500;margin:15px 0}.domain-card code{color:var(--accent);font-size:14px;overflow-wrap:anywhere}.domain-card p,.domain-guide p{line-height:2;color:var(--muted);font-size:14px}.domain-features{display:block;font-size:12px;color:var(--muted);margin:auto 0 24px;padding-top:15px}.domain-guide{max-width:720px;margin:70px 0 20px}.domain-guide h2{font-weight:500;font-size:30px}@media(max-width:850px){.domain-grid{grid-template-columns:1fr}.domain-card{padding:25px}.domain-guide{margin-top:45px}}@media(min-width:651px) and (max-width:1000px){.nav{flex-wrap:wrap;height:auto;min-height:80px;padding-block:12px;gap:12px}#menu{flex-wrap:wrap;gap:12px}}
.network-trail{padding-top:24px;font-size:12px;color:var(--muted)}.network-trail a:hover{color:var(--accent)}

.network-trail{display:block;position:static;background:transparent;border:0;letter-spacing:0;font-family:inherit;line-height:1.8}.network-trail a{display:inline;font-size:12px;letter-spacing:0}.brand strong{font-size:21px}@media(max-width:650px){.brand strong{font-size:19px}}

/* Each brand has a separate visual grammar, not just a different accent color. */
body[data-brand=tech]{font-family:ui-monospace,"SFMono-Regular",Consolas,"Noto Sans CJK SC",monospace;--paper:#f3f6f8;--paper2:#e7edf1;--card:#fbfdfe;--ink:#152b3b;--muted:#5a6c78;--line:#c6d2da;--accent:#087e9b;background-image:linear-gradient(#dfe8ed66 1px,transparent 1px),linear-gradient(90deg,#dfe8ed66 1px,transparent 1px);background-size:28px 28px}body[data-brand=tech] .site-header{border-bottom:3px solid var(--accent)}body[data-brand=tech] .seal{border-radius:0;background:var(--ink);box-shadow:inset 0 0 0 3px #ffffff30}body[data-brand=tech] .project-card,body[data-brand=tech] .domain-card{border-radius:0;box-shadow:5px 5px 0 var(--paper2)}body[data-brand=tech] .page-intro{border-bottom:3px solid var(--ink);position:relative}body[data-brand=tech] .page-intro:after{content:"GW / ENGINEERING";position:absolute;right:0;bottom:14px;color:var(--accent);font-size:11px;letter-spacing:2px}body[data-brand=tech] h1,body[data-brand=tech] h2,body[data-brand=tech] h3{font-family:inherit;letter-spacing:-1px}
body[data-brand=learn]{font-family:"Noto Serif CJK SC","Source Han Serif SC","Songti SC",serif;--paper:#fbf7ed;--paper2:#f0e7d3;--card:#fffdf6;--ink:#3e3527;--muted:#776b57;--line:#d9cbae;--accent:#a05c27;background-image:repeating-linear-gradient(0deg,transparent 0 35px,#c8b89424 36px,#c8b89424 37px)}body[data-brand=learn] .site-header{border-bottom:1px solid var(--accent)}body[data-brand=learn] .seal{border-radius:50%;width:48px;height:48px;background:transparent;border:1px solid var(--accent);color:var(--accent)}body[data-brand=learn] .page-intro{max-width:850px;border-bottom:1px solid var(--accent);margin-inline:auto;text-align:center}body[data-brand=learn] .page-intro .eyebrow{font:12px system-ui;letter-spacing:4px}body[data-brand=learn] .page-intro h1{font-weight:500}body[data-brand=learn] .prose{max-width:760px;margin-inline:auto}body[data-brand=learn] .scope-note,body[data-brand=learn] .domain-card{border:0;border-top:1px solid var(--accent);background:transparent}
body[data-brand=music]{font-family:system-ui,-apple-system,"Noto Sans CJK SC",sans-serif;--paper:#201c28;--paper2:#2a2433;--card:#302a3b;--ink:#f3edf8;--muted:#b5a9c0;--line:#51465e;--accent:#c49be9;color-scheme:dark;background-image:radial-gradient(ellipse at 85% 12%,#68498a55,transparent 38%),linear-gradient(135deg,#201c28,#251e30 60%,#1c202b)}body[data-brand=music] .site-header{background:#201c28ed;border-bottom-color:#6f5a82}body[data-brand=music] .seal{border-radius:50%;box-shadow:0 0 28px #c49be944;background:#6d4d87}body[data-brand=music] .page-intro{position:relative;overflow:hidden;border:0;padding:100px 0 65px}body[data-brand=music] .page-intro:after{content:"";position:absolute;right:0;top:35px;width:min(42vw,430px);height:160px;opacity:.56;background:repeating-linear-gradient(90deg,transparent 0 8px,#c49be9 9px 11px,transparent 12px 20px);mask-image:radial-gradient(ellipse,#000 0 42%,transparent 72%);clip-path:polygon(0 48%,5% 42%,10% 55%,15% 30%,20% 68%,25% 47%,30% 53%,35% 25%,40% 72%,45% 40%,50% 58%,55% 34%,60% 61%,65% 44%,70% 53%,75% 20%,80% 77%,85% 45%,90% 55%,95% 36%,100% 50%,100% 100%,0 100%);pointer-events:none}body[data-brand=music] .project-card,body[data-brand=music] .domain-card{border-radius:16px;background:linear-gradient(145deg,#332b40,#282430);box-shadow:0 18px 55px #09060d66}body[data-brand=music] .project-index{font-family:system-ui;letter-spacing:4px}body[data-brand=music] .footer{border-color:#6f5a82}
body.dark[data-brand=tech]{--paper:#111c23;--paper2:#1c2a33;--card:#192630;--ink:#e2edf2;--muted:#a8bac3;--line:#394c57;--accent:#62c7dd}body.dark[data-brand=learn]{--paper:#272319;--paper2:#342e20;--card:#302919;--ink:#f3ead6;--muted:#c2b69e;--line:#5c513a;--accent:#e2a969}body.dark[data-brand=music]{--paper:#17131e;--paper2:#211a2b;--card:#292234;--ink:#f6effb;--muted:#c5b9d0;--line:#51445f;--accent:#d6aff7}
body[data-brand]:not([data-brand=zhiwei]) .grain{display:none}

/* Higher contrast in dark mode. Keep secondary copy readable across every theme. */
body.dark{--paper:#171c1a;--paper2:#252d29;--ink:#f3f0e8;--muted:#c2c8c0;--line:#56615a;--accent:#ffad96;--card:#202723;--shadow:0 20px 60px #0006}
body.dark[data-brand=zhiwei]{--paper:#1b1d1a;--paper2:#292d28;--ink:#f5f0e5;--muted:#c4c2b8;--line:#555b50;--accent:#ffad96;--card:#242822}
body.dark[data-brand=tech]{--paper:#101a20;--paper2:#1d2a31;--card:#18252b;--ink:#eff8fa;--muted:#c0d0d6;--line:#4a626d;--accent:#7cdef1}
body.dark[data-brand=learn]{--paper:#101d1a;--paper2:#1a2b26;--card:#192823;--ink:#eff8f3;--muted:#c0d1c9;--line:#48655a;--accent:#78dfb4}
body.dark[data-brand=music]{--paper:#17131e;--paper2:#211a2b;--card:#292234;--ink:#f8f2fc;--muted:#d1c6dc;--line:#5b4d68;--accent:#d9b4fb}
body.dark .btn.primary{background:var(--accent);border-color:var(--accent);color:#171b19}
body.dark .theme,body.dark .btn:not(.primary){color:var(--ink)}
body.dark .seal{color:#151a17}
body.dark[data-brand=music] .seal{color:#fff}
body.dark .hint,body.dark .article-desc,body.dark .project-stack,body.dark .detail-aside p,body.dark .page-intro p,body.dark .prose p{color:var(--muted)}
body.dark .project-card,body.dark .domain-card,body.dark .contact-panel,body.dark .content-section,body.dark .scope-note{background-color:var(--card);border-color:var(--line)}
body.dark[data-brand=tech] .project-card,body.dark[data-brand=tech] .domain-card{box-shadow:5px 5px 0 var(--paper2)}

/* 拾级学堂 uses a modern course-workbench grammar, separate from the literary shuyuan. */
body[data-brand=learn]{font-family:system-ui,-apple-system,"Noto Sans CJK SC","Microsoft YaHei",sans-serif;--paper:#f1f6f3;--paper2:#e2ece6;--card:#fff;--ink:#18382f;--muted:#526b61;--line:#cadbd1;--accent:#25765e;background-image:radial-gradient(ellipse at 92% 8%,#c7e8d755,transparent 32%),linear-gradient(135deg,#f1f6f3,#edf3f0)}
body[data-brand=learn] .site-header{border-bottom:1px solid var(--line);box-shadow:0 4px 18px #174d3610}
body[data-brand=learn] .seal{width:48px;height:42px;border-radius:8px;background:var(--accent);border:0;color:#fff;font:700 17px/1 system-ui;letter-spacing:0;box-shadow:0 5px 14px #25765e30}
body[data-brand=learn] .brand strong{font:650 21px/1.2 system-ui,"Noto Sans CJK SC",sans-serif;letter-spacing:1px}
body[data-brand=learn] .page-intro{max-width:none;width:min(1120px,calc(100% - 52px));margin:38px auto 0;padding:34px 38px 38px;text-align:left;border:1px solid var(--line);border-left:5px solid var(--accent);border-radius:12px;background:var(--card);box-shadow:0 12px 36px #174d360c}
body[data-brand=learn] .page-intro .eyebrow{display:inline-flex;align-items:center;padding:5px 10px;border-radius:999px;background:var(--paper2);color:var(--accent);font:650 11px/1.4 system-ui;letter-spacing:1.5px}
body[data-brand=learn] .page-intro h1{font:650 clamp(30px,4vw,46px)/1.3 system-ui,"Noto Sans CJK SC",sans-serif;letter-spacing:0;margin:17px 0 9px}
body[data-brand=learn] .page-intro p{font-size:15px;color:var(--muted)}
body[data-brand=learn] .content-section{width:min(920px,calc(100% - 52px));margin:28px auto 80px;padding:30px 34px;border:1px solid var(--line);border-radius:12px;background:var(--card);box-shadow:0 12px 36px #174d360b}
body[data-brand=learn] .content-section h2{color:var(--ink);font:650 20px/1.4 system-ui,sans-serif}
body[data-brand=learn] .content-section p{max-width:68ch;color:var(--muted);line-height:2}
body[data-brand=learn] .prose{max-width:800px;margin-inline:auto}
body[data-brand=learn] .scope-note,body[data-brand=learn] .domain-card{border:1px solid var(--line);border-radius:10px;background:var(--paper)}
body[data-brand=learn] .scope-note{border-left:4px solid var(--accent)}
body[data-brand=learn] .footer{border-color:var(--line)}
body.dark[data-brand=learn] .page-intro,body.dark[data-brand=learn] .content-section{background:var(--card);border-color:var(--line);box-shadow:0 12px 36px #0003}
body.dark[data-brand=learn] .page-intro .eyebrow{background:#243a32;color:#8ce7bf}
body.dark[data-brand=learn] .seal{color:#10221b;background:#78dfb4}
body.dark[data-brand=learn]{background-image:radial-gradient(ellipse at 92% 8%,#214b3d55,transparent 32%),linear-gradient(135deg,#101d1a,#14231f)}
@media(max-width:650px){body[data-brand=learn] .page-intro{width:calc(100% - 36px);margin-top:20px;padding:25px 22px 27px}body[data-brand=learn] .content-section{width:calc(100% - 36px);padding:24px 21px;margin-top:20px}}