*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#F7F8FC;color:#38445A;font:16px/1.78 system-ui,-apple-system,"Microsoft YaHei","PingFang SC",sans-serif}body.locked{overflow:hidden}a{color:#55458e;text-decoration:none}a:hover{text-decoration:underline}button,input{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #7566AB;outline-offset:3px}img{max-width:100%;height:auto;object-fit:contain;object-position:center;display:block}.container{width:min(1160px,calc(100% - 56px));margin-inline:auto;min-width:0}h1,h2,h3{color:#202B43;line-height:1.35;overflow-wrap:anywhere}h1{font-size:clamp(26px,3vw,34px);margin:.3em 0 .6em}h2{font-size:clamp(21px,2.4vw,26px);margin:0 0 14px}h3{font-size:19px;margin:0 0 10px}p{margin:0 0 16px;overflow-wrap:anywhere}section,article,aside,.grid>*{min-width:0}.skip{position:absolute;top:-100px;left:12px;background:white;padding:8px;z-index:50}.skip:focus{top:10px}.site-header{background:#fff;border-bottom:1px solid #E2E8F1}.head-inner,.minor-inner{width:min(1160px,calc(100% - 56px));margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}.head-inner{min-height:70px}.brand{display:flex;align-items:center;font-weight:800;font-size:24px;color:#202B43;white-space:nowrap}.brand img{height:28px;width:auto;max-width:175px;object-fit:contain}.top-links,.head-actions,.minor-inner>div{display:flex;align-items:center;gap:clamp(10px,1.6vw,25px)}.top-links a,.head-actions a,.minor-inner a{font-size:14px;color:#38445A}.icon-button{border:0;background:transparent;color:#202B43;min-width:44px;min-height:44px;display:grid;place-items:center}.icon-button svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}.menu-open{display:none}.no-js-menu{display:none}.minor-nav{background:#EEF3FA;border-bottom:1px solid #E2E8F1}.minor-inner{min-height:40px;gap:12px}.minor-inner>span{font-size:13px;color:#637189}.minor-inner a{white-space:nowrap;padding:6px 0}.minor-inner a[aria-current]{color:#7566AB;border-bottom:2px solid #7566AB}main{padding-block:42px 70px}.eyebrow{font-size:13px;color:#7566AB;font-weight:700;letter-spacing:.13em}.lead{font-size:17px;max-width:66ch}.hero,.split,.article-lead,.feature{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.85fr);gap:30px;align-items:center}.hero{background:#EEF3FA;padding:28px;border:1px solid #E2E8F1;border-radius:14px}.hero .media{max-height:260px}.hero .media img{max-height:260px}.hero p{max-width:57ch}.media{display:grid;place-items:center;min-width:0;background:#EEF3FA;border-radius:12px;padding:10px;color:#637189;overflow:visible}.media img{max-width:100%;width:auto;height:auto;max-height:180px}.missing{text-align:center;min-height:110px}.missing span{font-size:14px;max-width:24ch}.hero .missing{min-height:170px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 18px;min-height:44px;border-radius:10px;background:#202B43;color:white;font-weight:600;margin:8px 12px 8px 0}.btn.alt{background:white;color:#202B43;border:1px solid #D9E7F6}.btn:hover{background:#55458e;color:white;text-decoration:none}.section{margin-top:54px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:20px}.section-head p{margin:0;max-width:62ch}.text-link{display:inline-block;font-weight:650;margin-top:8px}.text-link:after{content:' →'}.feature,.card,.article-panel,.info-box{background:#fff;border:1px solid #E2E8F1;border-radius:12px;padding:22px}.feature{grid-template-columns:minmax(0,.37fr) minmax(0,.63fr)}.feature .media img{max-height:165px}.card-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.card{display:flex;flex-direction:column;align-items:start}.card .media{width:100%;margin-bottom:16px}.card .media img{max-height:150px}.card p{flex:1}.split{align-items:stretch;grid-template-columns:1.15fr .85fr}.split>*{min-width:0}.split .media img{max-height:180px}.three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.three>*{background:#fff;border:1px solid #E2E8F1;border-radius:12px;padding:20px}.magazine{display:grid;grid-template-columns:minmax(0,.46fr) minmax(0,.54fr);gap:26px;align-items:start}.magazine .media img{max-height:190px}.magazine ul{padding-left:22px;margin:0}.magazine li{margin-bottom:16px}.app-feature{grid-template-columns:minmax(0,.3fr) minmax(0,.7fr)}.app-feature .media{max-width:210px;margin-inline:auto}.app-feature .media img{max-height:340px}.page-intro{margin-bottom:28px;max-width:76ch}.page-intro p{font-size:17px}.article-lead{align-items:start;margin-bottom:34px}.article-lead .media img{max-height:260px}.article-body{max-width:850px;margin-inline:auto}.article-body section{margin:0 0 36px}.article-body p{max-width:74ch}.article-body h2{padding-bottom:10px;border-bottom:1px solid #E2E8F1}.article-body ul{padding-left:24px}.article-body li{margin-bottom:10px}.layout-b .article-lead{display:block;text-align:center}.layout-b .article-lead .media{max-width:660px;margin:22px auto 0}.layout-b .page-intro{margin:auto}.layout-b .article-body{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;max-width:100%}.layout-b .article-body section{background:#fff;border:1px solid #E2E8F1;border-radius:12px;padding:22px;margin:0}.layout-b .article-body section:last-child:nth-child(odd){grid-column:1/-1}.layout-c .article-layout{display:grid;grid-template-columns:minmax(0,.27fr) minmax(0,.73fr);gap:32px}.toc{background:#EEF3FA;padding:20px;border-radius:12px;align-self:start}.toc a{display:block;padding:5px 0}.layout-c .article-lead{grid-template-columns:1fr .38fr}.layout-c .article-body{max-width:100%}.info-box{background:#EEF3FA;margin:24px 0}.page-end{margin-top:26px;border-top:1px solid #E2E8F1;padding-top:20px}.site-footer{background:#202B43;color:white;padding:42px 0}.footer-identity{margin-bottom:28px}.footer-brand{display:flex;gap:16px;align-items:center;color:white;font-weight:750;font-size:18px;flex-wrap:wrap}.footer-brand img{height:28px;width:auto;max-width:150px}.footer-identity p{margin-top:12px;color:#D9E7F6;font-size:14px}.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}.footer-grid h2{font-size:16px;color:white}.footer-grid a{display:block;color:#EDF2FC;padding:4px 0;font-size:14px}.mobile-end{display:none}.overlay[hidden]{display:none!important}.overlay{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:12px}.overlay-backdrop{position:absolute;inset:0;background:#15213ad9}.menu-sheet,.search-sheet{position:relative;background:#F7F8FC;border-radius:14px;width:min(800px,100%);max-height:calc(100dvh - 24px);overflow-y:auto;padding:24px;overscroll-behavior:contain}.overlay-title{display:flex;align-items:center;justify-content:space-between;gap:12px;color:#202B43;font-size:20px;border-bottom:1px solid #E2E8F1;padding-bottom:12px;margin-bottom:18px}.close-button{background:white;border:1px solid #E2E8F1;border-radius:9px;width:44px;height:44px;font-size:27px;color:#202B43}.menu-groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.menu-groups section{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 12px;align-content:start}.menu-groups h2{grid-column:1/-1;font-size:18px;padding-bottom:8px;border-bottom:1px solid #E2E8F1}.menu-groups a,.search-results a{padding:7px 3px;color:#38445A;overflow-wrap:anywhere}.search-sheet{width:min(600px,100%)}.search-sheet label{display:block;font-weight:650}.search-sheet input{width:100%;padding:12px;margin:8px 0;border-radius:9px;border:1px solid #637189;background:white}.search-note{font-size:13px;color:#637189}.search-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px}.faq-item{padding:20px 0;border-bottom:1px solid #E2E8F1}.faq-item h2{font-size:20px}.faq-item p{max-width:74ch}.page-footer-links{display:flex;gap:12px;flex-wrap:wrap}@media(max-width:1024px){.top-links a:nth-child(n+3){display:none}.minor-inner>span{display:none}.minor-inner{justify-content:center}.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:768px){.container,.head-inner,.minor-inner{width:calc(100% - 44px)}.head-inner{min-height:60px}.top-links,.app-link,.minor-nav{display:none!important}.menu-open{display:grid}.head-actions{gap:3px}.hero,.split,.feature,.magazine,.article-lead,.layout-c .article-lead,.app-feature{grid-template-columns:1fr}.hero{padding:20px}.hero .media img{max-height:220px}.section{margin-top:36px}.card-grid,.three,.layout-b .article-body,.layout-c .article-layout{grid-template-columns:1fr}.layout-b .article-body section:last-child:nth-child(odd){grid-column:auto}.article-body{max-width:100%}.toc{display:none}.menu-groups{gap:12px}.menu-sheet{padding:16px}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.mobile-end{display:flex;flex-wrap:wrap;gap:16px;border-top:1px solid #637189;margin-top:22px;padding-top:14px}.mobile-end a{color:white}}@media(max-width:480px){.container,.head-inner{width:calc(100% - 32px)}.brand{font-size:21px}.head-inner{gap:6px}.menu-groups{grid-template-columns:1fr}.menu-groups section{grid-template-columns:repeat(2,minmax(0,1fr))}.card-grid,.footer-grid{grid-template-columns:1fr}.feature,.card,.article-panel{padding:17px}.section-head{align-items:start;flex-direction:column}.article-lead .media img{max-height:160px}.missing{min-height:90px}.hero .missing{min-height:125px}.app-feature .media img{max-height:300px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}