:root{--ink:#13244b;--muted:#596579;--blue:#214ee8;--navy:#10224c;--line:#dbe1ec;--paper:#fff;--pale:#f3f6fc;--mono:ui-monospace,SFMono-Regular,Consolas,monospace}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}a,button{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:3px solid #e39a28;outline-offset:5px}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.14;letter-spacing:-.045em}h1{font-size:clamp(2.8rem,5vw,4.9rem);font-weight:650}h2{font-size:2.25rem;font-weight:600}h3{font-size:1.55rem;font-weight:600}p{color:var(--muted)}.wrap{width:min(1240px,calc(100% - 96px));margin:auto}.eyebrow{font-family:var(--mono);font-size:.75rem;letter-spacing:.09em;font-weight:500;display:block;color:var(--blue);line-height:1.6}.light{color:#d1dcff}.skip{position:fixed;top:-70px;left:16px;z-index:50;background:white;padding:12px}.skip:focus{top:10px}header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.header-inner{height:92px;display:flex;align-items:center;gap:55px}.brand{display:flex;gap:12px;align-items:center;font-size:1.1rem;line-height:1.05;letter-spacing:-.025em;font-weight:650;white-space:nowrap}.brand-bottom{display:block;font-size:1.5rem;letter-spacing:-.05em;margin-top:3px}.brand-symbol{position:relative;font-size:2.7rem;line-height:1;font-weight:750;letter-spacing:-.09em;padding-right:14px;color:var(--blue)}.brand-symbol>span{font-size:1.35rem;position:absolute;right:0;top:-3px}.header-inner nav{display:flex;gap:32px;margin-left:auto}.header-inner nav a{font-size:.9rem;font-weight:550;position:relative;padding:12px 0}.header-inner nav a:hover,.header-inner nav .active{color:var(--blue)}.header-inner nav .active:after{content:"";position:absolute;bottom:3px;height:2px;background:var(--blue);left:0;right:0}.header-cta{font-size:.875rem;border:1px solid var(--line);padding:10px 16px;font-weight:550}.header-cta span{margin-left:16px}.header-cta:hover{border-color:var(--blue);color:var(--blue)}.menu-toggle{display:none}.hero{background:var(--navy);color:white;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:72px;padding-top:68px;padding-bottom:65px}.tiny-cross{font-size:1.15rem;vertical-align:middle;margin-right:10px}.hero h1{margin:22px 0;font-size:clamp(3rem,5.2vw,4.8rem);line-height:1.04;letter-spacing:-.055em}.hero h1 em{font-style:normal;color:#a7c6ff}.hero p{font-size:1.05rem;color:#c8d4ed;line-height:1.65}.actions{display:flex;align-items:center;gap:28px;margin-top:30px}.button{display:inline-flex;justify-content:center;align-items:center;gap:25px;font-size:.9rem;font-weight:550;padding:13px 19px;line-height:1.6;transition:background .15s}.white{color:var(--navy);background:white}.white:hover{background:#d9e6ff}.dark{background:var(--blue);color:white}.dark:hover{background:#163cbe}.text-link{font-size:.875rem;color:#e0e8ff}.text-link:hover{text-decoration:underline}.decision-map{align-self:center;border:1px solid #47608b;background-color:#172e5b;background-image:linear-gradient(#ffffff04 1px,transparent 1px),linear-gradient(90deg,#ffffff04 1px,transparent 1px);background-size:24px 24px;padding:23px 27px 20px;position:relative;box-shadow:12px 12px 0 #0b1939}.map-head{display:flex;justify-content:space-between;gap:10px;font-family:var(--mono);font-size:.75rem;letter-spacing:.04em;color:#bdd0f3;border-bottom:1px solid #ffffff22;padding-bottom:16px;margin-bottom:20px}.map-head span:last-child{color:#adbee0}.map-input,.map-output{background:#0e2048;border:1px solid #5975a5;padding:15px 18px}.mono-label{font-family:var(--mono);font-size:.75rem;letter-spacing:.05em;color:#abc2ea}.map-input p{color:#f1f5ff;font-size:1rem;line-height:1.5;margin-top:8px}.map-flow{display:flex;flex-direction:column;align-items:center;color:#d7e3fd;font-family:var(--mono);font-size:.75rem;line-height:1.5}.map-flow b{font-weight:400;padding:5px}.map-flow>span{height:14px;width:1px;background:#6b89bd}.map-output>div{display:flex;gap:7px;margin-top:10px;font-size:.85rem}.map-output>div>span{border:1px solid #365583;color:#b8c7e1;padding:6px 10px}.map-output strong{display:flex;gap:18px;align-items:center;background:#bdd3ff;color:#14264e;padding:6px 12px;font-weight:600}.hero .map-caption{font-size:.75rem;color:#b5c6e3;line-height:1.5;margin-top:14px}.index-strip{background:#f2f5fb;border-bottom:1px solid var(--line)}.index-strip .wrap{display:flex;align-items:center;gap:30px;min-height:55px;font-family:var(--mono);font-size:.75rem}.index-strip .wrap>span:first-child{font-size:.75rem;color:var(--muted);letter-spacing:.03em}.index-strip a:hover{color:var(--blue)}.strip-date{margin-left:auto;color:var(--muted);font-size:.75rem}.section{padding-top:65px;padding-bottom:66px}.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-bottom:29px}.section-head h2{margin-top:11px;font-size:2rem}.section-head p{margin-top:10px;font-size:.95rem}.inline-link{font-size:.9rem;color:var(--blue);font-weight:550;white-space:nowrap}.inline-link:hover{text-decoration:underline}.model-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.model-card{border:1px solid var(--line);padding:25px 28px 0;background:white;transition:border-color .15s,transform .15s}.model-card:hover{border-color:var(--blue);transform:translateY(-3px)}.model-card-top{display:flex;justify-content:space-between;align-items:center}.model-icon{width:42px;height:42px;display:grid;place-items:center;font-family:Georgia,serif;font-size:1.7rem;font-style:italic}.laya{background:#ecefff;color:#4249b6}.jev{background:#e6f2f0;color:#16665d}.pill{font-family:var(--mono);font-size:.75rem;color:var(--muted);border:1px solid var(--line);padding:3px 8px;border-radius:3px}.model-card h3{margin:19px 0 10px;font-size:2rem}.model-card h3 span{float:right;color:var(--blue);font-size:1.6rem;font-weight:400}.model-card p{font-size:.95rem;line-height:1.6;padding-bottom:25px}.model-foot{border-top:1px solid var(--line);display:flex;justify-content:space-between;padding:14px 0;font-size:.75rem;font-family:var(--mono);color:var(--muted);gap:16px}.feature-band{background:#edf2ff;border-top:1px solid #dce4f9;border-bottom:1px solid #dce4f9}.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:100px;padding-top:50px;padding-bottom:50px}.feature-grid h2{font-size:2.7rem;margin:17px 0}.feature-grid p{max-width:450px;margin-bottom:24px}.feature-questions{align-self:center}.feature-questions a{display:flex;gap:22px;align-items:center;border-top:1px solid #c9d4ed;padding:26px 0}.feature-questions a:last-child{border-bottom:1px solid #c9d4ed}.feature-questions span{font-family:var(--mono);color:var(--blue);font-size:.8rem}.feature-questions h3{font-size:1.2rem;letter-spacing:-.025em}.feature-questions b{font-weight:400;margin-left:auto;color:var(--blue);font-size:1.4rem}.feature-questions a:hover h3{color:var(--blue)}.reading-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}.read-card{display:flex;flex-direction:column;align-items:flex-start;border-top:2px solid var(--ink);padding:21px 0 0}.read-card h3{font-size:1.6rem;margin:24px 0 15px;max-width:280px}.read-card p{font-size:.95rem;line-height:1.7;margin-bottom:30px}.read-link{font-size:.9rem;font-weight:550;margin-top:auto;width:100%;border-top:1px solid var(--line);padding-top:15px;display:flex;justify-content:space-between}.read-link span{color:var(--blue)}.read-card:hover h3{color:var(--blue)}.editorial{display:flex;align-items:center;gap:30px;border-top:1px solid var(--line);padding-top:33px;padding-bottom:48px}.atlas-mark{font-size:3rem;color:var(--blue);letter-spacing:-.15em}.editorial h2{font-size:1.25rem;letter-spacing:-.025em;margin-bottom:6px}.editorial p{font-size:.85rem;max-width:650px}.editorial>a{margin-left:auto}footer{background:#0d1b37;color:#f1f5ff}.footer-main{display:flex;align-items:flex-start;gap:65px;padding-top:45px;padding-bottom:40px}.footer-main .brand-symbol{color:#a4c0ff}.footer-main p{color:#b8c6de;font-size:.85rem}.footer-main>div{margin-left:auto;display:flex;gap:30px;font-size:.85rem;color:#d6dff0}.footer-main a:hover{color:#aec6ff}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #ffffff25;padding-top:20px;padding-bottom:23px;font-size:.75rem;color:#a9bad6}.directory h1{margin:23px 0}.standfirst{font-size:1.15rem;line-height:1.7;max-width:800px}.directory .standfirst{margin-bottom:44px}.directory-next{margin-top:45px;background:var(--pale);padding:32px}.directory-next h2{font-size:1.7rem}.directory-next p{margin:12px 0 22px}.article-top{background:var(--pale);border-bottom:1px solid var(--line);padding:22px 0 43px}.breadcrumb{font-size:.8rem;color:var(--muted);margin-bottom:32px;display:flex;gap:12px}.breadcrumb a:hover{color:var(--blue)}.article-top h1{font-size:clamp(2.5rem,4.3vw,4rem);max-width:940px;margin:15px 0 20px}.article-meta{font-size:.75rem;letter-spacing:.04em;font-family:var(--mono);color:var(--muted);margin-top:25px;display:flex;gap:15px}.article-layout{display:grid;grid-template-columns:185px minmax(0,1fr) 185px;gap:45px;padding-top:48px;padding-bottom:70px;align-items:start}.toc{position:sticky;top:123px}.toc .eyebrow,.fact-panel .eyebrow{font-size:.75rem;color:var(--muted)}.toc nav{display:flex;flex-direction:column;gap:12px;margin:20px 0 25px}.toc nav a{font-size:.875rem;line-height:1.4;color:var(--muted);border-left:2px solid var(--line);padding-left:12px}.toc nav a:hover{color:var(--blue);border-color:var(--blue)}.back-link{display:block;font-size:.8rem;color:var(--blue);border-top:1px solid var(--line);padding-top:18px}.prose{min-width:0}.prose section{margin-bottom:40px}.prose h2{font-size:1.65rem;letter-spacing:-.03em;margin:0 0 18px;line-height:1.25}.prose h3{font-size:1.2rem;letter-spacing:-.025em}.prose p{margin:0 0 17px;color:#425068;font-size:1rem;line-height:1.85}.prose ul{padding-left:21px;margin:12px 0 22px;color:#425068}.prose li{margin-bottom:12px;padding-left:3px;line-height:1.8}.prose strong{color:var(--ink);font-weight:600}.note{background:#eef3ff;border-left:3px solid var(--blue);padding:20px 23px;margin:25px 0 32px}.note strong{display:block;font-size:.95rem}.note p{font-size:.9rem;margin:7px 0 0;line-height:1.75}.output-list{border-top:1px solid var(--line)}.output-list>div{border-bottom:1px solid var(--line);padding:22px 0}.output-list span{font-family:var(--mono);font-size:.75rem;color:var(--blue)}.output-list h3{margin:8px 0}.output-list p{margin:0;font-size:.95rem}.prose .output-list+p{margin-top:20px}.fact-panel{border:1px solid var(--line);padding:20px 17px}.fact-panel dl{border-bottom:1px solid var(--line);padding:15px 0;margin:0}.fact-panel dt{color:var(--muted);font-size:.75rem;margin-bottom:6px}.fact-panel dd{font-size:.875rem;line-height:1.5;margin:0}.fact-panel>p{font-size:.75rem;line-height:1.6;margin-top:17px}.article-links{display:flex;flex-direction:column;border-top:1px solid var(--line);margin:20px 0}.article-links a{font-size:.95rem;color:var(--blue);padding:15px 0;border-bottom:1px solid var(--line)}.article-links a:hover{text-decoration:underline}.prose .sources{border-top:1px solid var(--line);padding-top:28px;margin-bottom:0}.sources h2{font-size:1.3rem}.sources p,.sources li{font-size:.85rem;line-height:1.7}.sources a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}.sources ul{padding-left:16px}.table-scroll{overflow-x:auto;max-width:100%;margin:20px 0 25px}table{border-collapse:collapse;font-size:.875rem;width:100%;text-align:left;min-width:450px}th,td{vertical-align:top;padding:15px 13px;border-bottom:1px solid var(--line);line-height:1.6}thead{background:var(--navy);color:white}thead th{font-weight:550}tbody th{font-weight:550;width:30%;background:var(--pale)}td{color:#425068}.code-block{background:#102143;color:#e6edff;margin:22px 0}.code-block>div{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;background:#1c3155;gap:20px}.code-block>div>span{font-family:var(--mono);font-size:.75rem;letter-spacing:.04em;color:#beceed}.copy-code{border:1px solid #7387ad;background:transparent;color:#fff;font-size:.75rem;padding:3px 10px;white-space:nowrap}.copy-code:hover{background:#375180}.code-block pre{padding:18px;margin:0;overflow-x:auto;font-size:.8rem;line-height:1.85}.code-block code{font-family:var(--mono)}.copy-status:not(:empty){display:block;padding:0 16px 10px;font-size:.75rem;color:#c5dbff}.prose p>code{font-size:.85em;background:#edf1f8;padding:2px 4px;overflow-wrap:anywhere}.resource-list{border-top:1px solid var(--line);margin-bottom:25px}.resource-list>a{display:flex;align-items:center;gap:32px;border-bottom:1px solid var(--line);padding:30px 0}.resource-list h2{font-size:1.65rem;margin:8px 0}.resource-list p{font-size:.95rem}.resource-list>a>span:last-child{margin-left:auto;font-size:2rem;color:var(--blue)}.resource-num{font-family:var(--mono);color:var(--muted)}.resource-list>a:hover h2{color:var(--blue)}.muted{font-size:.8rem;color:var(--muted)}
@media(min-width:1600px){.wrap{width:min(1340px,calc(100% - 120px))}.hero-grid{padding:78px 0}.hero h1{font-size:5.2rem}.decision-map{max-width:520px;width:100%;justify-self:end}}
@media(max-width:1100px){.wrap{width:calc(100% - 56px)}.header-inner{gap:28px}.hero-grid{gap:40px}.actions{gap:20px;flex-wrap:wrap}.article-layout{grid-template-columns:170px minmax(0,1fr);gap:35px}.fact-panel{display:none}.feature-grid{gap:50px}.index-strip .wrap{gap:22px}.strip-date{display:none}.footer-main{gap:35px}.footer-main>div{flex-direction:column;gap:8px}.map-head{font-size:.75rem}}
@media(max-width:760px){html{scroll-padding-top:90px}.wrap{width:calc(100% - 40px)}.header-inner{height:76px;gap:20px}.brand{font-size:.95rem;gap:8px}.brand-bottom{font-size:1.3rem}.brand-symbol{font-size:2.3rem}.header-cta{display:none}.menu-toggle{display:flex;gap:12px;margin-left:auto;align-items:center;font-size:.875rem;border:1px solid var(--line);background:#fff;padding:7px 12px;color:var(--ink)}.header-inner nav{display:none;position:absolute;top:76px;left:0;right:0;background:white;border-bottom:1px solid var(--line);padding:18px 22px;box-shadow:0 10px 15px #13244b10}.header-inner nav.open{display:flex;flex-direction:column;gap:7px}.header-inner nav a{padding:9px 0}.header-inner nav .active:after{display:none}.hero-grid{grid-template-columns:1fr;padding:42px 0 38px;gap:35px}.hero h1{font-size:clamp(2.8rem,9.5vw,4rem);margin:19px 0}.hero p{font-size:1rem}.hero .eyebrow{font-size:.75rem;letter-spacing:.04em}.decision-map{padding:20px;box-shadow:6px 6px 0 #0b1939}.map-head{font-size:.75rem}.index-strip .wrap{flex-wrap:wrap;gap:10px 20px;padding:14px 0;font-size:.75rem}.index-strip .wrap>span:first-child{width:100%;font-size:.75rem}.section{padding-top:40px;padding-bottom:40px}.section-head{align-items:flex-start;flex-direction:column;gap:13px;margin-bottom:22px}.section-head h2{font-size:1.7rem}.model-grid{grid-template-columns:1fr;gap:18px}.model-card{padding:22px 22px 0}.model-card p{padding-bottom:20px}.model-foot{font-size:.75rem}.feature-grid{grid-template-columns:1fr;gap:24px;padding:38px 0}.feature-grid h2{font-size:2.35rem}.feature-grid h2 br{display:none}.feature-questions a{padding:22px 0}.reading-grid{grid-template-columns:1fr;gap:30px}.read-card h3{max-width:none;font-size:1.55rem;margin:16px 0 12px}.read-card p{margin-bottom:18px}.editorial{flex-wrap:wrap;gap:17px;padding:26px 0 35px}.editorial>div{flex:1;min-width:230px}.editorial>a{margin-left:0}.atlas-mark{font-size:2.3rem}.footer-main{flex-wrap:wrap;gap:24px;padding:32px 0}.footer-main p{font-size:.8rem}.footer-main>div{margin-left:0;width:100%;flex-direction:row;flex-wrap:wrap;gap:20px}.footer-bottom{flex-wrap:wrap;gap:12px;font-size:.75rem}.footer-bottom>span:nth-child(2){display:none}.directory h1{font-size:2.7rem}.standfirst{font-size:1.05rem}.article-top{padding:20px 0 30px}.article-top h1{font-size:2.6rem}.breadcrumb{margin-bottom:24px}.article-meta{font-size:.75rem;gap:9px;flex-wrap:wrap}.article-layout{display:block;padding-top:28px;padding-bottom:40px}.toc{position:static;border-bottom:1px solid var(--line);margin-bottom:30px;padding-bottom:15px}.toc nav{flex-direction:row;flex-wrap:wrap;gap:12px 17px;margin:15px 0 0}.toc nav a{font-size:.8rem;padding-left:8px}.back-link{display:none}.prose h2{font-size:1.5rem}.prose p{font-size:1rem}.prose section{margin-bottom:30px}.note{padding:18px}.resource-list>a{gap:15px;align-items:flex-start}.resource-list h2{font-size:1.4rem}.resource-list .eyebrow{font-size:.75rem}.resource-num{display:none}.directory-next{padding:24px}.code-block pre{font-size:.75rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
.evidence-note{border:1px solid #b9c9f0;background:#f2f6ff;padding:22px;margin-bottom:30px}.evidence-note p{margin:9px 0 14px;font-size:.95rem}.source-figure{margin:26px 0;border:1px solid var(--line);padding:12px;background:#f7f9fc}.source-figure img{display:block;width:100%;height:auto}.source-figure figcaption{font-size:.8rem;line-height:1.7;padding:14px 5px 5px;color:var(--muted)}.source-figure figcaption a{color:var(--blue);text-decoration:underline}.video-link{background:var(--pale);border:1px solid var(--line);padding:24px;margin:24px 0}.video-link h3{margin:13px 0}.video-link p{font-size:.9rem}.evidence-grid .read-card{background:var(--pale);padding:22px; border-top:3px solid var(--blue)}.evidence-grid .read-card h3{margin-top:17px}.evidence-grid .read-link{color:var(--blue)}
.quick-answer{border-left:3px solid var(--blue);padding:17px 22px;background:white;max-width:940px;margin-top:25px}.quick-answer p{font-size:.95rem;line-height:1.75;color:#344663;margin-top:7px}.quick-answer .eyebrow{font-size:.75rem}@media(max-width:760px){.quick-answer{padding:16px;margin-top:22px}.quick-answer p{font-size:.95rem}}
.language-switch{font-size:.875rem;color:var(--blue);white-space:nowrap;border:1px solid var(--line);padding:7px 11px;margin-left:auto;order:2}.header-inner nav{order:1}.header-cta{order:3}.menu-toggle{order:4}.header-inner{gap:26px}.header-inner nav{margin-left:auto}.language-switch{margin-left:0}html[lang="zh-CN"] body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}html[lang="zh-CN"] h1,html[lang="zh-CN"] h2,html[lang="zh-CN"] h3{letter-spacing:-.015em;line-height:1.3}html[lang="zh-CN"] .hero h1{font-size:clamp(2.8rem,4.8vw,4.4rem)}html[lang="zh-CN"] .prose p{line-height:1.95}@media(max-width:760px){.header-inner{gap:12px}.language-switch{margin-left:auto;padding:6px 8px;font-size:.8rem}.menu-toggle{margin-left:0}.header-inner nav{order:5}.brand{font-size:.85rem}.brand-bottom{font-size:1.2rem}html[lang="zh-CN"] .article-top h1{font-size:2.15rem}}