:root{--bg:#F4F7FA;--white:#fff;--mist:#EAF1F6;--aqua:#E9F8F8;--navy:#102E46;--dark:#163C57;--teal:#13B8C5;--blue:#237BD3;--heading:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539;--max:1200px}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;overflow-wrap:break-word}body.drawer-active{overflow:hidden}a{color:#1269AB;text-underline-offset:3px}a:hover{color:#09527E}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}button{font:inherit;cursor:pointer}h1,h2,h3,h4{color:var(--heading);line-height:1.38;margin:0 0 .75em}h1{font-size:clamp(2rem,3.2vw,2.65rem);letter-spacing:-.025em}h2{font-size:clamp(1.5rem,2.2vw,1.75rem)}h3{font-size:1.22rem}p{margin:0 0 1.05em}p:last-child{margin-bottom:0}ul,ol{padding-left:1.4em}li+li{margin-top:.5em}section{scroll-margin-top:30px}.wrap{width:min(calc(100% - 56px),var(--max));margin-inline:auto}.readable{max-width:780px}.eyebrow{font-size:.8rem;letter-spacing:.13em;font-weight:800;color:#087B8B;text-transform:uppercase}.section{margin-top:clamp(42px,5vw,66px);margin-bottom:clamp(42px,5vw,66px)}.section-head{max-width:780px;margin-bottom:22px}.subtle{color:var(--muted)}.lead{font-size:1.08rem;line-height:1.85}.skip-link{position:absolute;z-index:120;left:15px;top:-80px;background:#fff;padding:8px 16px}.skip-link:focus{top:10px}.site-header{position:relative;z-index:30}.brand-bar{background:#fff;border-bottom:1px solid var(--line)}.brand-inner{height:72px;display:flex;align-items:center;gap:22px;min-width:0}.brand{display:flex;align-items:center;max-width:220px;min-width:0;text-decoration:none}.brand-note{font-size:.85rem;color:var(--muted);white-space:nowrap}.brand-note i{font-style:normal;color:var(--teal);padding:0 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a{color:var(--muted)}.page-intro{padding:30px 0 24px}.page-intro p{max-width:820px}.page-intro--band{background:var(--mist);padding:37px 0 34px;margin-top:10px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.page-intro--dark{background:var(--navy);color:#e3f1f5;padding:42px 0;margin-top:8px}.page-intro--dark h1{color:white}.page-intro--dark .eyebrow{color:#65e2e4}.topic-nav{display:flex;gap:8px;flex-wrap:wrap;margin-top:20px}.topic-nav a{border:1px solid #C5D9E5;background:white;text-decoration:none;padding:7px 15px;border-radius:999px;color:var(--heading);font-weight:700;font-size:.9rem}.topic-nav a:hover{border-color:var(--teal)}.button-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 20px;border-radius:10px;text-decoration:none;font-weight:700;min-height:44px}.btn-primary{background:var(--navy);color:white}.btn-primary:hover{color:white;background:var(--dark)}.btn-outline{border:1px solid #A6C5D6;color:var(--heading);background:white}.btn-outline:hover{background:var(--mist)}.hero{display:grid;grid-template-columns:minmax(0,1.06fr) minmax(0,.94fr);gap:38px;align-items:center;margin-top:35px}.hero p{max-width:590px}.hero .eyebrow{margin-bottom:14px}.hero h1{font-size:clamp(2.1rem,3.3vw,2.75rem)}.media-frame{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;padding:8px;border-radius:14px;background:var(--mist);border:1px solid #DDE9EF}.media-frame 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36px);text-align:center;color:#597183;font-size:.84rem}.media-frame--logo.media-frame--missing{min-height:38px;min-width:145px;background:#eff4f7}.media-frame--hero.media-frame--missing{min-height:200px}.media-frame--mobile.media-frame--missing{min-height:200px}.directory{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 36px;border-top:2px solid var(--navy)}.directory-item{border-bottom:1px solid var(--line);padding:22px 0;display:grid;grid-template-columns:32px minmax(0,1fr);gap:14px}.directory-item .number{font-size:.83rem;color:#007F8B;font-weight:800;padding-top:4px}.directory-item h3{margin-bottom:5px}.directory-item h3 a{text-decoration:none;color:var(--heading)}.directory-item h3 a:hover{text-decoration:underline}.directory-item p{font-size:.94rem;margin:0}.focus-layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:20px}.focus-main{background:var(--navy);color:#e0edf4;padding:32px;border-radius:14px}.focus-main h3{color:white;font-size:1.55rem}.focus-main a{color:#8BE6ED}.focus-side{display:grid;gap:15px}.focus-side article{border:1px solid var(--line);background:white;padding:23px;border-radius:12px}.feature-split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:35px;align-items:center}.feature-split.reverse{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr)}.contrast-band{background:var(--aqua);padding:35px;border-radius:16px;border-left:4px solid var(--teal)}.rule-trio{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:start}.rule-trio article{padding:24px;background:white;border:1px solid var(--line);border-radius:12px}.rule-trio article:nth-child(2){margin-top:26px}.rule-trio article:nth-child(3){margin-top:52px}.route-steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;counter-reset:route}.route-steps article{border-top:3px solid var(--teal);padding:17px 4px 0;counter-increment:route}.route-steps article:before{content:'0' counter(route);display:block;color:#16849A;font-size:.9rem;font-weight:800;margin-bottom:12px}.route-steps h3{font-size:1.1rem}.editor-note{border-left:3px solid #9CB8C7;padding:18px 25px;background:white}.article-shell{display:grid;grid-template-columns:minmax(0,1fr) 265px;gap:42px;align-items:start}.article-shell>article{min-width:0}.article-shell aside{min-width:0;background:white;border:1px solid var(--line);border-radius:12px;padding:23px}.article-shell aside h2{font-size:1.17rem}.prose-section{margin:0 0 44px}.prose-section p{max-width:800px}.prose-section h2{padding-bottom:12px;border-bottom:1px solid var(--line)}.fact-list{list-style:none;padding:0;margin:0}.fact-list li{padding:10px 0;border-bottom:1px solid var(--line)}.fact-list li:last-child{border:0}.panel{padding:24px;border:1px solid var(--line);background:white;border-radius:12px}.soft-panel{padding:26px;background:var(--mist);border-radius:12px}.callout{background:var(--aqua);border-left:4px solid var(--teal);padding:20px 24px;margin:25px 0;border-radius:0 10px 10px 0}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:12px;background:white}.data-table{width:100%;border-collapse:collapse;text-align:left;min-width:590px}.data-table caption{text-align:left;padding:18px 20px;font-weight:700;color:var(--heading)}.data-table th,.data-table td{padding:13px 17px;vertical-align:top;border-bottom:1px solid var(--line);font-size:.95rem}.data-table th{background:#e7f0f6;color:var(--heading);font-weight:700}.data-table tr:last-child td{border-bottom:0}.data-table tbody th{background:#f3f7fa}.flow-stages{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.flow-stages article{background:white;padding:23px;border:1px solid var(--line);border-top:4px solid var(--teal);border-radius:9px}.flow-stages 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0 12px}.essay{max-width:800px}.essay p{margin-bottom:1.3em}.gallery-piece{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:28px;align-items:center;margin-bottom:34px}.gallery-piece:nth-of-type(even){grid-template-columns:minmax(0,1fr) minmax(0,1.15fr)}.gallery-piece:nth-of-type(even) .media-frame{order:2}.gallery-piece .media-frame{min-width:0}.index-box{padding:22px;background:white;border:1px solid var(--line);border-radius:12px;max-width:800px}.index-box ul{columns:3;list-style:none;padding:0;margin:10px 0 0}.index-box li{break-inside:avoid}.index-box a{text-decoration:none;font-weight:700}.handbook{max-width:870px}.handbook section{margin-bottom:50px}.handbook h2{border-bottom:2px solid var(--line);padding-bottom:13px}.faq-list{display:grid;gap:10px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:0 20px}.faq-list summary{cursor:pointer;color:var(--heading);font-weight:700;padding:15px 0;min-height:48px}.faq-list details[open] summary{border-bottom:1px solid var(--line)}.faq-list details p{padding:14px 0 17px;margin:0}.service-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:40px}.service-nav{background:white;border:1px solid var(--line);border-radius:12px;padding:20px;align-self:start}.service-nav h2{font-size:1.15rem}.service-nav a{display:block;text-decoration:none;padding:7px 0;border-bottom:1px solid var(--line);font-size:.9rem}.service-nav a:last-child{border:0}.service-article section{margin-bottom:44px}.related-reading{border-top:2px solid var(--navy);padding-top:25px;margin:50px 0 65px}.related-reading h2{font-size:1.45rem}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-links a{display:block;padding:18px;background:white;border:1px solid var(--line);border-radius:10px;text-decoration:none;font-weight:700;color:var(--heading)}.related-links 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@media(max-width:1024px){.wrap{width:calc(100% - 44px)}.brand-note{font-size:.78rem}.article-shell{grid-template-columns:minmax(0,1fr) 235px;gap:26px}.hero{gap:25px}}
@media(max-width:920px){.brand-inner{height:62px;justify-content:space-between;gap:12px}.desktop-nav{display:none}.brand-note{display:none}.menu-toggle{display:flex;width:40px;height:40px;flex-direction:column;align-items:center;justify-content:center;gap:5px;flex:0 0 40px;background:transparent;border:1px solid var(--line);border-radius:9px}.menu-toggle span{width:19px;height:2px;background:var(--navy);display:block}.brand{position:absolute;left:50%;transform:translateX(-50%);max-width:min(39vw,200px)}.brand .media-frame--logo img{max-height:30px}.entry-link{margin-left:auto;padding:7px 11px;font-size:.79rem;min-height:39px;display:flex;align-items:center;justify-content:center}.drawer-overlay{position:fixed;inset:0;z-index:80;background:rgba(7,24,39,.53);opacity:0;transition:opacity .22s;visibility:hidden;pointer-events:none}.drawer-overlay.is-open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{position:fixed;top:0;left:0;bottom:0;z-index:90;width:min(86vw,340px);background:white;box-shadow:12px 0 25px #0b253930;padding:19px 20px;overflow-y:auto;transform:translateX(-104%);transition:transform .22s;visibility:hidden;pointer-events:none}.mobile-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-heading{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:11px}.drawer-heading strong{color:var(--heading)}.menu-close{width:40px;height:40px;background:var(--mist);border:0;border-radius:8px;font-size:1.6rem;color:var(--heading);line-height:1}.drawer-group-label{font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:25px 0 8px;font-weight:800}.mobile-drawer>a{display:block;padding:10px 12px;border-radius:8px;color:var(--heading);text-decoration:none}.mobile-drawer>a.is-current{background:var(--mist);border-left:3px solid var(--teal);font-weight:700}.nojs-nav{display:none}body:has(.site-header noscript){} .mobile-shortcuts{display:flex;gap:18px;flex-wrap:wrap;padding:20px 0 30px;border-top:1px solid var(--line)}.mobile-shortcuts a{font-size:.87rem}.footer-layout{gap:25px}}
@media(max-width:760px){.article-shell,.service-layout{grid-template-columns:1fr}.article-shell>aside{order:2}.service-article{order:1}.service-nav{order:2}.focus-layout,.feature-split,.feature-split.reverse,.gallery-piece,.gallery-piece:nth-of-type(even){grid-template-columns:1fr}.gallery-piece:nth-of-type(even) .media-frame{order:0}.three-col{grid-template-columns:1fr 1fr}.route-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-layout{grid-template-columns:1fr 1fr}.footer-brand{grid-column:span 2}.related-links{grid-template-columns:1fr}.index-box ul{columns:1}.hero{grid-template-columns:1fr}.rule-trio{grid-template-columns:1fr}.rule-trio article:nth-child(n){margin-top:0}.matrix{grid-template-columns:1fr}}
@media(max-width:640px){body{font-size:15.5px}.wrap{width:calc(100% - 32px)}h1{font-size:clamp(1.58rem,7vw,1.82rem)}h2{font-size:1.32rem}h3{font-size:1.09rem}.hero h1{font-size:clamp(1.7rem,7.4vw,2rem)}.hero{margin-top:22px;gap:18px}.page-intro{padding:23px 0 14px}.page-intro--band,.page-intro--dark{padding:28px 0}.section{margin-top:35px;margin-bottom:35px}.directory,.two-col,.three-col,.flow-stages{grid-template-columns:1fr}.directory-item{padding:17px 0}.focus-main,.focus-side article,.panel,.soft-panel,.contrast-band{padding:19px}.gallery-piece{gap:15px}.route-steps{gap:14px}.table-scroll{margin-inline:0}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--article{--media-limit:175px}.media-frame--wide{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-frame--logo{--media-limit:30px}.media-frame--logo img{max-height:30px}.media-frame--hero.media-frame--missing{min-height:150px}.footer-layout{grid-template-columns:1fr}.footer-brand{grid-column:auto}.footer-bottom{display:block}.footer-bottom a{display:block;margin-top:8px}.site-footer{padding-top:34px}.back-to-top{right:16px;bottom:16px}}
@media(max-width:380px){.brand{max-width:35vw}.entry-link{font-size:.72rem;padding:6px 8px}.brand .media-frame--logo.media-frame--missing{min-width:80px}.button-row{gap:9px}.btn{padding:10px 13px;font-size:.88rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
@media(max-width:920px){noscript .nojs-nav{display:flex;flex-wrap:wrap;gap:8px;background:var(--navy);padding:10px 16px}noscript .nojs-nav a{color:white;font-size:.85rem;padding:4px 7px}}