:root {
  --brand:#8a163c; --brand-hover:#67112d; --gold:#f2c94c; --ink:#29242a;
  --muted:#69626b; --line:#e1dce3; --surface:#f6f4f7; --white:#fff; --tint:#f5eaf0;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
body{margin:0;background:var(--white);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC","Segoe UI",sans-serif;font-size:16px;line-height:1.75;letter-spacing:0}
h1,h2,h3,p,figure{margin:0}h1,h2,h3{line-height:1.55;overflow-wrap:anywhere}
h1{font-size:32px;text-wrap:balance}h2{font-size:25px}h3{font-size:21px}
a{color:inherit;text-decoration:none}a:hover{color:var(--brand)}
img{display:block;max-width:100%;object-fit:cover}
p{overflow-wrap:anywhere}button,input{font:inherit}button{cursor:pointer}input{min-width:0}
a,button,input,summary{touch-action:manipulation}
a,button{transition:background-color .18s,color .18s,border-color .18s}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--brand);outline-offset:4px}
::selection{background:var(--gold);color:var(--ink)}
.container{width:100%;max-width:1280px;padding:0 40px;margin:0 auto}
.section{padding:44px 0}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:24px}
.section-heading>p{font-size:14px;color:var(--muted)}
.icon{display:inline-flex;width:20px;height:20px;align-items:center;justify-content:center;flex-shrink:0;vertical-align:middle}
.icon svg{width:100%;height:100%;stroke-width:1.8}
.icon-button{display:inline-flex;align-items:center;justify-content:center;width:46px;height:46px;padding:0;border:0;border-radius:6px;color:var(--ink);background:transparent}
.icon-button:hover{background:var(--tint);color:var(--brand)}
.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:46px;line-height:1.5;padding:12px 20px;border:1px solid transparent;border-radius:6px;font-size:14px;font-weight:600}
.button-primary{background:var(--brand);color:var(--white)}.button-primary:hover{background:var(--brand-hover);color:var(--white)}
.button-secondary{background:var(--white);border-color:var(--line);color:var(--brand)}.button-secondary:hover{background:var(--tint);border-color:var(--brand)}
.button-accent{background:var(--gold);color:var(--ink)}.button-accent:hover{background:#ffe17b;color:var(--ink)}
.text-link{display:inline-flex;align-items:center;gap:8px;min-height:40px;font-size:14px;font-weight:600;color:var(--brand)}
.text-link:hover{text-decoration:underline;text-underline-offset:5px}
.topic-label{font-size:13px;font-weight:600;color:var(--brand);display:inline-block}
.topic-label[href]{padding:5px 0;min-height:32px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;left:20px;top:-100px;padding:12px 20px;background:var(--gold);z-index:100}
.skip-link:focus{top:12px}
.edition-bar{border-top:4px solid var(--gold);background:var(--surface);color:var(--muted);font-size:12px}
.edition-bar>.container{display:flex;gap:20px;align-items:center;justify-content:space-between;min-height:36px}
.edition-bar a{display:inline-flex;align-items:center;gap:8px;min-height:30px}
.edition-bar .icon{width:14px;height:14px}
.site-header{border-bottom:1px solid var(--line)}
.masthead{display:flex;gap:36px;align-items:center;min-height:100px}
.brand{display:inline-flex;flex-shrink:0}.brand img{width:280px;height:56px;object-fit:contain}
.library-nav{display:flex;gap:28px;align-items:center;margin-left:auto}
.library-nav a{display:flex;align-items:center;font-size:14px;min-height:46px;border-bottom:3px solid transparent;padding-top:3px}
.library-nav a[aria-current]{color:var(--brand);font-weight:700;border-bottom-color:var(--brand)}
.header-actions{display:flex;align-items:center;gap:6px}.nav-toggle,.menu-close{display:none}
.library-intro{padding-top:34px}.intro-title{display:flex;gap:30px;justify-content:space-between;align-items:center}
.intro-title h1{font-size:30px;margin-bottom:10px}.intro-title p{font-size:17px;color:var(--muted)}
.lookup-form{margin-top:26px}.lookup-form>label{font-size:13px;display:block;margin-bottom:8px;font-weight:600}
.lookup-input{display:flex;gap:16px;align-items:center;border:1px solid #aaa1ac;padding:6px 6px 6px 18px;border-radius:8px;background:var(--white)}
.lookup-input>.icon{color:var(--muted)}.lookup-input input{border:0;flex:1;width:0;padding:10px 0;background:transparent;min-height:44px;color:var(--ink);font-size:16px}
.lookup-input input::placeholder{color:var(--muted)}.lookup-input .button{min-width:96px}
.topic-nav{display:flex;gap:12px 28px;align-items:center;flex-wrap:wrap;margin-top:22px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.topic-nav a{display:inline-flex;align-items:center;gap:10px;min-height:44px;font-size:14px}
.topic-nav a:first-child{font-weight:700;color:var(--brand)}
.topic-nav a>span:last-child{font-size:12px;color:var(--muted);font-weight:400}.topic-nav .icon{width:18px;height:18px}
.note-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}
.note-card{border:1px solid var(--line);border-radius:8px;overflow:hidden;display:flex;flex-direction:column;min-width:0;background:var(--white)}
.note-image{display:block;aspect-ratio:1.75;overflow:hidden}.note-image img{width:100%;height:100%;object-position:center}
.note-content{padding:20px 22px 16px;display:flex;flex-direction:column;flex:1}
.note-card h3{font-size:20px;margin:8px 0 12px;line-height:1.65}.note-card h3 a:hover{text-decoration:underline;text-underline-offset:5px}
.note-content>p{font-size:14px;color:var(--muted);line-height:1.9;margin-bottom:20px}
.note-bottom{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:10px;border-top:1px solid var(--line);padding-top:10px}
.note-bottom>span{font-size:12px;color:var(--muted)}.note-bottom .text-link{font-size:13px}
.index-section{background:var(--surface);margin-top:8px}.index-layout{display:grid;grid-template-columns:minmax(0,1fr) 265px;gap:48px}
.index-layout>*{min-width:0}.keyword-table{border-top:2px solid var(--brand)}
.keyword-table-head,.keyword-row{display:grid;grid-template-columns:minmax(0,1fr) 100px 24px;gap:24px;align-items:center}
.keyword-table-head{font-size:12px;color:var(--muted);padding:14px 0;border-bottom:1px solid var(--line)}
.keyword-row{min-height:62px;border-bottom:1px solid var(--line);padding:15px 0;font-size:14px}
.keyword-row:hover{background:var(--tint)}.keyword-row strong{font-weight:500;overflow-wrap:anywhere}.keyword-row>span{font-size:12px;color:var(--muted)}
.keyword-row .icon{width:18px;height:18px;color:var(--brand)}
.reading-guide{padding-top:4px}.reading-guide h2{font-size:21px;padding-bottom:20px;border-bottom:2px solid var(--gold)}
.reading-guide dl{margin:24px 0}.reading-guide dt{font-size:15px;font-weight:700;margin-bottom:8px}.reading-guide dd{font-size:14px;color:var(--muted);line-height:1.9;margin:0 0 24px}
.scope-brief{display:flex;gap:12px;align-items:flex-start;margin-top:28px;border-top:1px solid var(--line);padding-top:24px}
.scope-brief .icon{color:var(--brand);margin-top:4px}.scope-brief p{font-size:13px;color:var(--muted);line-height:1.9}
.download-band{background:var(--brand);color:var(--white);padding:32px 0}
.download-band>.container{display:flex;gap:24px;align-items:center}.download-band .icon{width:28px;height:28px}
.download-band h2{font-size:24px;margin-bottom:6px}.download-band p{font-size:14px;color:#f4dbe4}
.download-band .button{margin-left:auto;flex-shrink:0}.download-band .button .icon{width:18px;height:18px}
.page-heading{background:var(--surface);border-bottom:1px solid var(--line);padding-bottom:34px}
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:20px 0;font-size:12px;color:var(--muted)}
.breadcrumb>span:last-child{overflow-wrap:anywhere}
.page-heading h1{margin:16px 0 14px;font-size:32px}.page-heading p:not(.topic-label){max-width:820px;color:var(--muted);line-height:1.9}
.heading-title{display:flex;justify-content:space-between;align-items:center;gap:40px}.heading-title .button{flex-shrink:0}
.page-heading .lookup-form{max-width:900px;margin-top:20px}.page-heading .lookup-form label{color:var(--ink)}
.filter-tabs{display:flex;flex-wrap:wrap;gap:8px 28px;border-bottom:1px solid var(--line);margin-bottom:28px}
.filter-tabs a{display:flex;align-items:center;min-height:46px;font-size:14px;border-bottom:3px solid transparent;padding-bottom:8px}
.filter-tabs a[aria-current]{border-color:var(--brand);color:var(--brand);font-weight:700}
.search-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.empty-state{text-align:center;padding:40px 0 60px}.empty-state>.icon{width:36px;height:36px;margin-bottom:20px;color:var(--brand)}
.empty-state h2{margin-bottom:12px}.empty-state p{color:var(--muted);margin-bottom:24px}
.document-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}
.resource-card{border:1px solid var(--line);border-radius:8px;overflow:hidden;display:flex;flex-direction:column;min-width:0}
.resource-card>img{width:100%;height:auto;aspect-ratio:2.2}
.resource-content{padding:24px;display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px;flex:1}
.resource-content>.topic-label,.resource-content>h3,.resource-content>p{width:100%}
.resource-content h3{font-size:24px}.resource-content>p:not(.topic-label){font-size:14px;color:var(--muted);line-height:1.9;margin-bottom:12px;align-self:start}
.resource-content .button{margin-top:auto}.resource-content .text-link{margin-top:auto;font-size:13px}
.download-note{display:flex;gap:14px;align-items:flex-start;padding:24px 0 0;margin-top:20px;border-top:1px solid var(--line);font-size:14px;color:var(--muted);max-width:900px}
.download-note>.icon{margin-top:4px;color:var(--brand)}
.article-frame{max-width:1040px}.article-head{max-width:860px;margin:28px auto}
.article-head h1{font-size:32px;line-height:1.6;margin:16px 0 18px}.article-deck{font-size:18px;line-height:1.95;color:var(--muted)}
.article-meta{display:flex;gap:24px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin-top:24px}
.contents{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:14px 0;margin:30px 0}
.contents summary{display:flex;align-items:center;justify-content:space-between;min-height:44px;font-size:14px;font-weight:700;list-style:none;cursor:pointer}
.contents summary::-webkit-details-marker{display:none}.contents[open] summary .icon{transform:rotate(180deg)}
.contents nav{display:flex;gap:8px 24px;flex-wrap:wrap;margin:8px 0 4px}
.contents nav a{display:inline-flex;align-items:center;min-height:40px;font-size:13px;color:var(--brand)}
.contents nav a:hover{text-decoration:underline;text-underline-offset:5px}
.article-cover img{width:100%;height:auto;aspect-ratio:2.1}.article-cover figcaption{display:flex;gap:16px;justify-content:space-between;align-items:center;padding:12px 0;font-size:12px;color:var(--muted)}
.article-cover figcaption a{display:inline-flex;align-items:center;gap:6px}.article-cover figcaption .icon{width:14px;height:14px}
.article-reading{max-width:760px;margin:30px auto 0}.takeaways{border-left:5px solid var(--gold);padding:0 0 0 24px;margin-bottom:38px}
.takeaways h2{font-size:20px}.takeaways ul{font-size:15px;line-height:1.9;margin:14px 0 0;padding-left:18px}.takeaways li+li{margin-top:7px}
.article-body h2{font-size:25px;margin:36px 0 18px;scroll-margin-top:24px}
.article-body p{font-family:"Songti SC","SimSun","Microsoft YaHei",serif;font-size:19px;line-height:2;margin-bottom:24px}
.example-block{border:1px dashed #b99aa9;border-radius:6px;padding:24px 28px;margin:34px 0;background:#fcf9fb}
.example-block h2{font-size:20px;margin:0 0 16px;display:flex;align-items:center;gap:10px;color:var(--brand)}
.example-block p:last-child{font-size:18px;margin-bottom:0}
.article-end{border-top:1px solid var(--line);margin-top:36px;padding-top:24px;display:flex;gap:24px;align-items:center;justify-content:space-between}
.article-end p{font-size:13px;color:var(--muted);max-width:420px}.article-end .button{flex-shrink:0}
.related-section{border-top:1px solid var(--line);margin:44px 0;padding-top:30px}
.related-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.related-list>a{display:flex;gap:14px;align-items:flex-start;justify-content:space-between;font-size:16px;font-weight:600;padding:20px;border:1px solid var(--line);border-radius:6px;line-height:1.8}
.related-list>a:hover{border-color:var(--brand)}.related-list .icon{margin-top:4px;color:var(--brand)}
.prose{max-width:840px}.prose h2{font-size:25px;margin:32px 0 18px}.prose h2:first-child{margin-top:0}
.prose p{font-size:17px;line-height:2;margin-bottom:20px}
.prose-note{display:flex;gap:16px;align-items:flex-start;margin-top:30px;padding-top:24px;border-top:1px solid var(--line)}
.prose-note>.icon{margin-top:6px;color:var(--brand)}.prose-note a{color:var(--brand);text-decoration:underline;text-underline-offset:5px}
.faq-list{max-width:1040px}.faq-item{border-bottom:1px solid var(--line);padding:18px 0}.faq-item:first-child{border-top:1px solid var(--line)}
.faq-item summary{display:flex;gap:24px;align-items:center;justify-content:space-between;font-size:18px;font-weight:600;min-height:48px;cursor:pointer;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}.faq-item summary .icon{color:var(--brand)}.faq-item[open] summary .icon{transform:rotate(45deg)}
.faq-item>p{margin:18px 42px 8px 0;font-size:16px;color:var(--muted);line-height:2}
.site-footer{background:var(--white);padding-top:40px;border-top:1px solid var(--line)}
.footer-main{display:grid;grid-template-columns:minmax(0,1fr) 220px 220px;gap:60px;padding-bottom:30px}
.footer-main>div>p{font-size:14px;color:var(--muted);margin:20px 0 10px}
.footer-domain{font-size:14px;color:var(--brand);display:inline-flex;align-items:center;min-height:40px;overflow-wrap:anywhere}
.footer-main nav h2{font-size:15px;margin:8px 0 14px}.footer-main nav a{font-size:14px;display:flex;align-items:center;min-height:36px;color:var(--muted)}
.footer-main nav a:hover{color:var(--brand)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:24px;border-top:1px solid var(--line);padding:16px 0;font-size:12px;color:var(--muted)}
.footer-bottom .text-link{font-size:12px}
.footer-scope{background:var(--brand);color:var(--white);padding:16px 0;font-size:12px}
.footer-scope>.container{display:flex;justify-content:space-between;align-items:center;gap:30px}
.footer-scope a{color:var(--white);white-space:nowrap;display:inline-flex;min-height:32px;align-items:center;text-decoration:underline;text-underline-offset:4px}
@media(max-width:1100px){
  .masthead{gap:20px}.library-nav{gap:20px}.brand img{width:250px;height:50px}
  .note-grid,.document-grid{gap:22px}.note-content{padding:18px}.note-card h3{font-size:19px}
  .index-layout{gap:32px;grid-template-columns:minmax(0,1fr) 240px}
  .resource-content{padding:20px}.footer-main{grid-template-columns:minmax(0,1fr) 180px 180px;gap:36px}
}
@media(max-width:980px){
  .container{padding-left:28px;padding-right:28px}.library-nav{gap:16px}.masthead{gap:16px}
  .library-nav a{font-size:13px}.brand img{width:230px;height:46px}
  .note-grid,.document-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .index-layout{grid-template-columns:minmax(0,1fr)}.reading-guide{border-top:1px solid var(--line);padding-top:28px}
  .reading-guide dl{display:grid;grid-template-columns:100px minmax(0,1fr);gap:16px}.reading-guide dt,.reading-guide dd{margin:0}
  .reading-guide h2{padding-bottom:14px}.scope-brief{max-width:620px}
  .intro-title h1{font-size:28px}.intro-title{align-items:flex-start}.intro-title>.text-link{white-space:nowrap}
  .resource-content h3{font-size:22px}.article-cover img{aspect-ratio:1.9}
}
@media(max-width:860px){
  .masthead{min-height:90px;flex-wrap:wrap;gap:0}.brand img{width:260px;height:52px}.header-actions{margin-left:auto}
  .nav-toggle{display:inline-flex}.library-nav{display:none;width:100%;order:3;margin:0;flex-direction:column;align-items:stretch;gap:0;padding:8px 0 20px}
  .library-nav a{font-size:15px;border-bottom:0;padding:10px 0;min-height:48px}
  .library-nav a[aria-current]{background:var(--surface);padding-left:14px}
  .menu-visible .library-nav{display:flex}.menu-visible .menu-open{display:none}.menu-visible .menu-close{display:inline-flex}
  .intro-title{display:block}.intro-title>.text-link{margin-top:10px}.footer-main{gap:28px;grid-template-columns:minmax(0,1fr) 170px 150px}
  .footer-main .brand img{width:230px;height:46px}.related-list{grid-template-columns:minmax(0,1fr)}
}
@media(max-width:760px){
  .container{padding-left:20px;padding-right:20px}.section{padding:32px 0}.edition-bar{font-size:11px}
  .edition-bar>.container{gap:12px}.edition-bar .icon{display:none}
  .library-intro{padding-top:26px}.intro-title h1{font-size:27px}.intro-title p{font-size:16px}
  .lookup-form{margin-top:20px}.lookup-input{padding-left:12px;gap:10px}.lookup-input input{font-size:16px}
  .lookup-input .button{min-width:72px;padding:10px 14px}.lookup-input>.icon{width:18px;height:18px}
  .topic-nav{gap:6px 22px;padding-bottom:16px;margin-top:16px}.topic-nav a{font-size:13px}
  .topic-nav .icon{width:16px;height:16px}.section-heading{gap:14px;align-items:baseline;margin-bottom:20px}
  .section-heading h2{font-size:23px}.section-heading>p{display:none}.section-heading>.text-link{font-size:12px;flex-shrink:0}
  .note-grid,.document-grid{gap:22px}.note-card h3{font-size:20px}
  .keyword-table-head,.keyword-row{grid-template-columns:minmax(0,1fr) 74px 18px;gap:12px}
  .keyword-row{font-size:14px;min-height:64px}.keyword-row>span{font-size:11px}.keyword-table-head{font-size:11px}
  .reading-guide dl{grid-template-columns:70px minmax(0,1fr);gap:16px 12px}
  .download-band{padding:28px 0}.download-band>.container{flex-wrap:wrap;gap:18px}
  .download-band>.container>.icon{display:none}.download-band h2{font-size:23px}.download-band p{font-size:14px}
  .download-band .button{margin:0}.breadcrumb{font-size:11px;padding:18px 0;gap:6px}
  .page-heading{padding-bottom:28px}.page-heading h1{font-size:28px;margin-top:12px}
  .page-heading p:not(.topic-label){font-size:15px}.heading-title{display:block}.heading-title>.button{margin-top:22px}
  .filter-tabs{gap:8px 24px}.filter-tabs a{font-size:13px}.document-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .resource-content{padding:20px}.resource-content h3{font-size:23px}
  .article-head{margin:18px 0 24px}.article-head h1{font-size:28px}.article-deck{font-size:17px}
  .article-meta{gap:8px 18px;margin-top:20px;font-size:11px}.contents{margin:24px 0}
  .contents nav{gap:4px 18px}.contents nav a{font-size:12px;min-height:40px}
  .article-cover img{aspect-ratio:1.65}.article-cover figcaption{display:block;font-size:11px;line-height:1.9}
  .article-cover figcaption a{margin-top:6px}.article-reading{margin-top:24px}
  .takeaways{padding-left:20px;margin-bottom:30px}.takeaways h2{font-size:19px}.takeaways ul{font-size:14px}
  .article-body h2{font-size:23px;margin:30px 0 16px}.article-body p{font-size:18px;line-height:2}
  .example-block{padding:20px;margin:28px 0}.example-block h2{font-size:20px;margin-top:0}.example-block p:last-child{font-size:17px}
  .article-end{display:block}.article-end>.button{margin-top:20px}.related-section{margin:32px 0}
  .related-list>a{font-size:16px;padding:18px}.prose h2{font-size:23px}.prose p{font-size:16px}
  .faq-item summary{font-size:17px;gap:18px}.faq-item>p{margin-right:0;font-size:16px}
  .footer-main{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}.footer-main>div{grid-column:1/-1}
  .footer-main .brand img{width:260px;height:52px}.footer-main nav a{font-size:13px;min-height:38px}
  .footer-bottom{font-size:11px;gap:12px;align-items:flex-start}.footer-bottom>span{max-width:70%}
  .footer-bottom .text-link{font-size:11px;white-space:nowrap;min-height:32px}
  .footer-scope>.container{display:block}.footer-scope p{font-size:11px;line-height:1.9}.footer-scope a{margin-top:8px}
}
@media(max-width:600px){
  .brand img{width:235px;height:47px}.masthead{min-height:84px}.header-actions{gap:0}.header-actions .icon-button{width:42px;height:44px}
  .note-grid,.search-grid,.document-grid{grid-template-columns:minmax(0,1fr)}
  .note-image{aspect-ratio:1.9}.note-content{padding:20px}.note-card h3{font-size:22px}
  .note-content>p{font-size:15px}.note-bottom .text-link{font-size:14px}
  .index-layout .section-heading{display:block}.index-layout .section-heading>.text-link{margin-top:8px}
  .keyword-table-head,.keyword-row{grid-template-columns:minmax(0,1fr) 68px 18px;gap:10px}
  .resource-card>img{aspect-ratio:2}.resource-content>p:not(.topic-label){font-size:15px}
  .intro-title h1{font-size:26px;line-height:1.65}
}
@media(max-width:380px){
  .brand img{width:202px;height:41px}.header-actions .icon-button{width:38px}
  .edition-bar{font-size:10px}.edition-bar>.container{gap:8px}
  .intro-title h1{font-size:24px}.lookup-input>.icon{display:none}.lookup-input{gap:6px}
  .lookup-input .button{min-width:60px;padding:10px 12px}.lookup-input input{font-size:15px}
  .topic-nav{gap:4px 16px}.topic-nav a{gap:7px;font-size:12px}
  .keyword-table-head,.keyword-row{grid-template-columns:minmax(0,1fr) 58px 14px;gap:8px}
  .keyword-row{font-size:13px}.keyword-row>span{font-size:10px}.keyword-row .icon{width:14px;height:14px}
  .article-head h1{font-size:25px}.article-deck{font-size:16px}.note-card h3{font-size:21px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}