:root{--ink:#152a38;--muted:#62717c;--line:#dde4e8;--paper:#f7f9fa;--blue:#155cce;--navy:#0a2335;--cyan:#9fdbef;--max:1320px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;color:var(--ink);background:#fff;font-family:Inter,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #3183e9;outline-offset:5px}button{cursor:pointer}p{line-height:1.8}img,svg{max-width:100%}.wrap{width:min(var(--max),calc(100% - 112px));margin:auto}.skip{position:fixed;top:-100px;padding:12px;background:white;z-index:50}.skip:focus{top:10px}.preview-bar{background:#ecf2f6;color:#4b6375;font-size:11px;line-height:1.6;letter-spacing:.03em;text-align:center;padding:7px 20px}.header{height:91px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.97);position:sticky;top:0;z-index:20}.header-inner{height:100%;display:flex;align-items:center;gap:42px}.logo{font-size:39px;font-weight:760;letter-spacing:-2.6px;line-height:1;display:inline-block;color:var(--navy)}.logo i{font-style:normal;color:var(--blue)}.brand{display:flex;align-items:center;gap:19px;flex-shrink:0}.brand small{font-size:9px;text-transform:uppercase;line-height:1.65;letter-spacing:.11em;border-left:1px solid var(--line);padding-left:17px;max-width:112px}.nav{display:flex;align-items:center;justify-content:space-between;gap:23px;flex:1}.nav a{font-size:12px;font-weight:550;white-space:nowrap}.nav a.active{color:var(--blue)}.utilities{display:flex;align-items:center;gap:20px;font-size:12px;white-space:nowrap}.search-link{font-size:22px;line-height:1}.lang{border-left:1px solid var(--line);padding-left:20px}.menu-toggle{display:none;background:none;border:0;padding:5px;color:var(--ink);font-size:24px}.eyebrow{font:11px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);display:flex;align-items:center;gap:10px}.eyebrow:before{content:"";height:6px;width:6px;background:var(--blue);display:inline-block}.hero{padding-top:67px;background:linear-gradient(110deg,#fff 40%,#f2f7fa);overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.2fr 1fr;align-items:center;gap:40px;min-height:390px}.hero h1{font-size:clamp(48px,5.2vw,78px);line-height:1.075;font-weight:520;letter-spacing:-.06em;margin:23px 0}.hero h1 span{color:var(--blue)}.hero .intro{max-width:500px;font-size:16px;color:var(--muted);line-height:1.85;margin:25px 0}.hero-actions{display:flex;align-items:center;gap:28px;margin:28px 0 50px}.btn{display:inline-flex;align-items:center;justify-content:space-between;gap:30px;background:var(--navy);color:#fff;padding:15px 22px;font-size:12px;border:1px solid var(--navy);font-weight:600}.btn:hover{background:var(--blue);border-color:var(--blue);color:#fff}.text-link{font-size:12px;font-weight:600;display:inline-flex;gap:15px;align-items:center}.hero-visual{position:relative;align-self:stretch;display:flex;align-items:center;min-height:360px}.hero-visual svg{width:100%;overflow:visible}.art-caption{position:absolute;bottom:14px;left:30px;right:10px;display:flex;justify-content:space-between;font:9px/1.6 ui-monospace,monospace;letter-spacing:.12em;color:#627d8d;text-transform:uppercase}.search-strip{border-top:1px solid var(--line);display:flex;align-items:center;gap:30px;padding:25px 0}.search-strip label{font:10px/1.6 ui-monospace,monospace;text-transform:uppercase;letter-spacing:.13em;max-width:110px}.search-form{flex:1;display:flex;border-bottom:1px solid #a6b6c3;align-items:center;padding:0 0 8px}.search-form input{flex:1;min-width:0;border:0;background:transparent;padding:10px 0;font-size:15px;outline-offset:2px}.search-form button{border:0;color:var(--blue);background:none;font-size:25px;padding:0 10px}.search-suggestions{display:flex;gap:15px;font-size:10px;color:var(--muted);flex-shrink:0}.search-suggestions a{border-bottom:1px solid #bac6cf}.section{padding:72px 0}.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:25px;margin-bottom:33px}.section-head h2{font-size:32px;letter-spacing:-.035em;font-weight:520;margin:10px 0}.section-head p{font-size:13px;color:var(--muted);margin:0}.section-number{font:10px ui-monospace,monospace;color:var(--blue);letter-spacing:.12em}.application-grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}.application{padding:28px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);min-height:170px;transition:background .2s}.application:hover{background:#f0f6fc}.app-top{display:flex;justify-content:space-between;color:var(--blue);margin-bottom:28px}.app-top .symbol{font-size:26px;line-height:1;font-weight:300}.app-top .arrow{font-size:20px}.application h3{font-size:16px;font-weight:550;letter-spacing:-.02em;margin:0 0 8px}.application p{font-size:12px;color:var(--muted);margin:0;max-width:270px}.tinted{background:var(--paper)}.insight-grid{display:grid;grid-template-columns:1.08fr 1fr;gap:52px}.featured-art{height:245px;background:#dfeaf2;overflow:hidden;position:relative;margin-bottom:24px}.featured-art svg{width:100%;height:100%}.over-art{position:absolute;top:18px;left:20px;font:10px/1.5 ui-monospace,monospace;color:#264b69;letter-spacing:.15em}.meta{font:10px/1.6 ui-monospace,monospace;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);display:flex;flex-wrap:wrap;gap:12px;align-items:center}.meta .category{color:var(--blue)}.badge{font:9px/1.2 ui-monospace,monospace;padding:4px 6px;border:1px solid #c4d3de;letter-spacing:.02em;border-radius:2px;text-transform:uppercase;color:#5f7280;display:inline-block}.featured h3{font-size:29px;font-weight:500;line-height:1.3;letter-spacing:-.035em;margin:14px 0}.featured p{font-size:13px;color:var(--muted)}.featured .text-link{margin-top:12px}.side-list{display:flex;flex-direction:column}.article-row{display:grid;grid-template-columns:1fr auto;gap:20px;padding:25px 0;border-bottom:1px solid var(--line)}.article-row:first-child{padding-top:0}.article-row h3{font-size:19px;font-weight:520;line-height:1.45;letter-spacing:-.02em;margin:10px 0}.article-row p{font-size:12px;color:var(--muted);margin:0}.row-arrow{font-size:23px;align-self:center;color:var(--blue)}.qa-layout{display:grid;grid-template-columns:1fr 1.75fr;gap:80px}.qa-intro h2{font-size:39px;line-height:1.15;letter-spacing:-.045em;font-weight:520;margin:15px 0 22px;max-width:320px}.qa-intro p{font-size:13px;color:var(--muted);max-width:280px}.qa-intro .text-link{margin-top:25px}.question-row{display:flex;align-items:center;gap:22px;border-bottom:1px solid var(--line);padding:20px 0;font-size:15px;line-height:1.6}.question-row:first-child{padding-top:0}.question-row .num{font:10px ui-monospace,monospace;color:#7e8f9c}.question-row .q{flex:1}.question-row .plus{font-size:23px;color:var(--blue);font-weight:300}.intelligence{background:var(--navy);color:#fff;position:relative;overflow:hidden}.intel-grid{display:grid;grid-template-columns:1fr 1fr;gap:90px;align-items:center}.intelligence .eyebrow{color:#b1c7d5}.intelligence .eyebrow:before{background:#8ebcfd}.intelligence h2{font-size:46px;line-height:1.12;letter-spacing:-.04em;font-weight:450;margin:23px 0}.intelligence p{color:#b5c7d4;font-size:13px;max-width:470px}.intel-link{padding:23px 0;border-bottom:1px solid #375063;display:flex;justify-content:space-between;font-size:16px}.intel-link:hover{color:var(--cyan)}.intel-link small{color:#8eaabb;font:10px ui-monospace,monospace;margin-right:16px}.latest-row{display:grid;grid-template-columns:145px 1fr auto;align-items:start;gap:35px;border-bottom:1px solid var(--line);padding:25px 0}.latest-row h3{font-size:19px;font-weight:500;line-height:1.4;letter-spacing:-.02em;margin:0 0 8px}.latest-row p{font-size:12px;color:var(--muted);margin:0;max-width:700px}.latest-row>.meta{padding-top:6px}.about-band{border-top:1px solid var(--line)}.about-grid{display:grid;grid-template-columns:1fr 1.3fr;gap:70px}.about-grid h2{font-size:37px;font-weight:500;line-height:1.15;letter-spacing:-.04em;margin:16px 0}.about-grid p{font-size:15px;line-height:1.9;color:var(--muted);margin-top:0}.footer{background:#f0f4f6;border-top:1px solid var(--line);padding:58px 0 24px}.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:70px}.footer .logo{font-size:43px}.footer p{font-size:12px;max-width:300px;color:var(--muted)}.footer h4{font:10px ui-monospace,monospace;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin:0 0 20px}.footer-links{display:grid;grid-template-columns:1fr 1fr;gap:13px;font-size:12px}.footer-links.single{grid-template-columns:1fr}.footer-bottom{border-top:1px solid #cfd9df;margin-top:42px;padding-top:22px;display:flex;justify-content:space-between;gap:30px;color:var(--muted);font:10px/1.7 ui-monospace,monospace}.disclosure{font-size:11px;line-height:1.8;color:var(--muted);max-width:650px;margin-top:30px}.page-head{padding:48px 0 45px;border-bottom:1px solid var(--line);background:#f8fafb}.breadcrumb{font-size:11px;color:var(--muted);display:flex;flex-wrap:wrap;gap:12px;margin:0 0 32px}.page-head h1{font-size:54px;line-height:1.12;letter-spacing:-.045em;font-weight:500;max-width:900px;margin:18px 0}.page-head .summary{font-size:17px;color:var(--muted);max-width:760px;line-height:1.8;margin:20px 0 25px}.page-head .meta{margin-top:27px}.topic-tabs{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 35px}.topic-tabs a{font-size:12px;border:1px solid var(--line);padding:10px 15px}.topic-tabs a:hover,.topic-tabs a.active{background:var(--navy);color:#fff;border-color:var(--navy)}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.card{border:1px solid var(--line);padding:28px;display:flex;flex-direction:column;min-height:310px;background:#fff}.card:hover{border-color:#91b6de}.card h2,.card h3{font-size:22px;line-height:1.4;font-weight:510;letter-spacing:-.025em;margin:18px 0}.card p{font-size:13px;line-height:1.8;color:var(--muted);flex:1}.card .text-link{margin-top:25px}.tag-list{display:flex;gap:7px;flex-wrap:wrap;margin:18px 0}.tag-list a{font-size:10px;padding:5px 8px;background:#edf2f6;color:#556d7e}.notice{background:#edf4fa;border-left:2px solid var(--blue);padding:16px 20px;font-size:12px;line-height:1.9;color:#526b7e;margin-bottom:30px}.article-layout{display:grid;grid-template-columns:minmax(0,760px) 250px;gap:90px;align-items:start}.article-body h2{font-size:27px;font-weight:520;letter-spacing:-.025em;line-height:1.4;margin:42px 0 16px}.article-body h2:first-child{margin-top:0}.article-body p{font-size:16px;line-height:1.95;color:#374e5e;margin:0 0 22px}.article-body .lead-answer{padding:26px;background:#edf4fa;border-left:3px solid var(--blue);font-size:19px;line-height:1.8;color:var(--ink)}.article-aside{position:sticky;top:125px;border-left:1px solid var(--line);padding-left:25px}.article-aside h2{font:10px/1.6 ui-monospace,monospace;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin:0 0 20px}.article-aside a{display:block;font-size:12px;line-height:1.6;margin-bottom:16px}.references{padding-top:18px;border-top:1px solid var(--line);margin-top:40px}.references ol{padding-left:20px}.references li{font-size:12px;line-height:1.8;margin:12px 0;overflow-wrap:anywhere}.references a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}.resource{background:var(--paper);border:1px solid var(--line);padding:30px;margin:40px 0}.resource .eyebrow{font-size:9px}.resource h3{font-size:23px;letter-spacing:-.02em;font-weight:500;margin:18px 0}.resource p{font-size:13px;line-height:1.8}.resource .text-link{color:var(--blue)}.reading-tools{border-top:1px solid var(--line);padding-top:20px;margin-top:30px;display:flex;gap:20px;align-items:center;font-size:12px}.copy-link{background:transparent;border:1px solid var(--line);padding:9px 14px;color:var(--ink)}.empty{padding:45px;border:1px dashed #b8cbd9;background:#f9fbfd;line-height:1.8;color:var(--muted);font-size:14px}.search-panel{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:30px}.search-panel input{flex:2;min-width:220px;padding:15px;border:1px solid #adbfcc;background:white}.search-panel select{flex:1;min-width:160px;padding:15px;border:1px solid #adbfcc;background:white;color:var(--ink)}.search-panel button{padding:15px 22px;background:var(--navy);border:0;color:white}.result-count{font:11px/1.8 ui-monospace,monospace;color:var(--muted);margin-bottom:25px}.simple-prose{max-width:800px}.simple-prose h2{font-size:27px;font-weight:500;margin:40px 0 15px;letter-spacing:-.02em}.simple-prose p{font-size:16px;line-height:1.95;color:#465e6e}.compare-table{width:100%;border-collapse:collapse;font-size:13px}.compare-table th,.compare-table td{text-align:left;padding:18px;border:1px solid var(--line);line-height:1.8}.compare-table th{background:var(--paper);font-weight:550}.table-scroll{overflow-x:auto}.property-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.property{background:var(--paper);padding:25px;border-top:2px solid var(--blue)}.property h3{font-size:19px;font-weight:500}.property p{font-size:13px;color:var(--muted);line-height:1.8}html[lang=zh-CN] .hero h1{font-size:clamp(43px,4.4vw,66px);letter-spacing:-.035em;line-height:1.25}html[lang=zh-CN] .page-head h1{font-size:44px;letter-spacing:-.025em;line-height:1.4}html[lang=zh-CN] .nav{gap:20px}html[lang=zh-CN] .hero .intro{line-height:2}html[lang=zh-CN] .article-body p{line-height:2.05}html[lang=zh-CN] .section-head h2{letter-spacing:0}html[lang=zh-CN] .nav a{font-size:13px}
@media(min-width:1600px){.hero{padding-top:85px}.hero-grid{min-height:450px}}
@media(max-width:1250px){.wrap{width:calc(100% - 72px)}.brand small{display:none}.header-inner{gap:35px}.nav{gap:17px}.nav a{font-size:11px}.utilities{gap:15px}.hero h1{font-size:64px}.search-suggestions{display:none}.article-layout{gap:55px;grid-template-columns:minmax(0,1fr) 220px}.qa-layout{gap:45px}}
@media(max-width:980px){.nav{display:none;position:absolute;left:0;right:0;top:90px;padding:25px 36px;background:white;border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;gap:20px}.nav.open{display:flex}.nav a{font-size:15px}.header-inner{justify-content:space-between}.utilities{margin-left:auto}.menu-toggle{display:block}.hero-grid{grid-template-columns:1.1fr 1fr;gap:10px}.hero h1{font-size:52px}.hero .intro{font-size:14px}.hero-actions{gap:20px;align-items:flex-start;flex-direction:column}.application-grid{grid-template-columns:repeat(2,1fr)}.insight-grid{gap:30px}.cards{grid-template-columns:repeat(2,1fr)}.qa-layout{grid-template-columns:1fr 1.5fr;gap:30px}.qa-intro h2{font-size:32px}.intel-grid{gap:45px}.intelligence h2{font-size:37px}.footer-top{gap:35px}.article-layout{grid-template-columns:minmax(0,1fr)}.article-aside{position:static;grid-row:1;border:1px solid var(--line);padding:20px}.article-aside nav{display:flex;flex-wrap:wrap;gap:10px 20px}.article-aside a{margin:0}.article-aside h2{margin-bottom:15px}.latest-row{grid-template-columns:120px 1fr auto;gap:20px}}
@media(max-width:680px){.wrap{width:calc(100% - 40px)}.preview-bar{font-size:9px;padding:6px 14px}.header{height:74px}.logo{font-size:34px}.nav{top:73px;padding:24px 20px}.utilities{gap:16px}.lang{padding-left:16px}.hero{padding-top:38px}.hero-grid{grid-template-columns:1fr;min-height:auto}.hero h1{font-size:53px;letter-spacing:-.055em;max-width:440px;margin:23px 0}.hero .intro{font-size:14px;max-width:400px;margin-bottom:22px}.hero-actions{flex-direction:row;flex-wrap:wrap;align-items:center;gap:23px;margin-bottom:12px}.hero-visual{min-height:235px;height:250px;max-width:390px;justify-self:center;width:100%;margin:0 0 10px}.art-caption{font-size:8px;bottom:4px;left:16px}.hero-visual svg{height:240px}.search-strip{gap:15px;padding:22px 0}.search-strip label{display:none}.search-form input{font-size:12px}.section{padding:49px 0}.section-head{gap:20px;align-items:flex-start;flex-wrap:wrap;margin-bottom:25px}.section-head h2{font-size:28px}.section-head p{font-size:12px}.section-head>.text-link{align-self:flex-end}.application{padding:21px 18px;min-height:167px}.application h3{font-size:14px;line-height:1.5}.application p{font-size:11px;line-height:1.7}.app-top{margin-bottom:22px}.insight-grid{grid-template-columns:1fr;gap:35px}.featured-art{height:220px}.featured h3{font-size:27px}.article-row h3{font-size:18px}.qa-layout{grid-template-columns:1fr;gap:30px}.qa-intro h2{max-width:100%;font-size:34px}.qa-intro p{max-width:100%}.qa-intro .text-link{margin-top:8px}.question-row{font-size:14px;gap:15px}.intel-grid{grid-template-columns:1fr;gap:20px}.intelligence h2{font-size:38px}.intel-link{font-size:15px}.latest-row{grid-template-columns:1fr auto;gap:13px}.latest-row>.meta{grid-column:1/-1}.latest-row h3{font-size:19px}.about-grid{grid-template-columns:1fr;gap:22px}.about-grid h2{font-size:33px}.about-grid p{font-size:14px}.footer{padding-top:40px}.footer-top{grid-template-columns:1fr 1fr;gap:35px 22px}.footer-brand{grid-column:1/-1}.footer-links{grid-template-columns:1fr;font-size:11px}.footer-bottom{flex-direction:column;gap:8px;font-size:9px}.page-head{padding:30px 0}.page-head h1{font-size:36px;letter-spacing:-.035em}.page-head .summary{font-size:15px}.breadcrumb{font-size:10px;margin-bottom:25px}.cards{grid-template-columns:1fr}.card{min-height:260px;padding:24px}.article-body p{font-size:15px;line-height:1.95}.article-body h2{font-size:24px}.article-body .lead-answer{font-size:17px;padding:20px}.article-layout{gap:30px}.resource{padding:24px}.property-grid{grid-template-columns:1fr}.search-panel{gap:10px}.search-panel input{flex-basis:100%}.search-panel select{min-width:120px}.search-panel button{width:100%}.reading-tools{flex-wrap:wrap}.empty{padding:25px}html[lang=zh-CN] .hero h1{font-size:45px}html[lang=zh-CN] .page-head h1{font-size:32px}html[lang=zh-CN] .hero-actions{gap:20px}html[lang=zh-CN] .application h3{font-size:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media print{.header,.preview-bar,.footer,.article-aside,.reading-tools,.related-section{display:none}.wrap{width:100%}.article-layout{display:block}.page-head{background:white}.section{padding:20px 0}a{color:inherit}.article-body p{font-size:11pt}.resource{break-inside:avoid}}
.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}