:root{--bg:#F4F7FA;--paper:#fff;--mist:#EAF1F6;--aqua:#E9F8F8;--nav:#102E46;--deep:#163C57;--cyan:#13B8C5;--blue:#237BD3;--head:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;color:var(--body);overflow-wrap:anywhere}a{color:#1669b5;text-underline-offset:3px}a:hover{color:#0d536d}button{font:inherit;cursor:pointer}img{max-width:100%}h1,h2,h3{color:var(--head);line-height:1.35;letter-spacing:-.025em}h1{font-size:clamp(2rem,3vw,2.25rem);margin:0 0 20px}h2{font-size:clamp(1.5rem,2.2vw,1.75rem);margin:0 0 18px}h3{font-size:1.22rem;margin:0 0 9px}p{margin:0 0 18px}section{scroll-margin-top:30px}.container{width:min(1200px,calc(100% - 56px));margin-inline:auto}.skip-link{position:absolute;z-index:200;top:-80px;left:12px;background:#fff;padding:10px}.skip-link:focus{top:8px}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}.site-header{background:#fff;border-bottom:1px solid var(--line)}.brand-row{display:flex;align-items:center;min-height:72px;gap:22px}.brand{display:flex;align-items:center;min-width:0;text-decoration:none;color:var(--head)}.brand img{display:block;width:auto;height:auto;max-height:38px;max-width:240px;object-fit:contain}.brand strong{font-size:23px;line-height:1.1;white-space:nowrap}.brand small{display:block;font-size:10px;letter-spacing:.16em}.brand-tagline{font-size:13px;color:var(--muted);border-left:1px solid var(--line);padding-left:18px;white-space:nowrap}.entry-link{display:inline-flex;align-items:center;justify-content:center;margin-left:auto;background:var(--deep);color:#fff;text-decoration:none;border-radius:8px;min-height:42px;padding:0 22px;font-weight:700;white-space:nowrap}.entry-link:hover{background:#0c6985;color:#fff}.desktop-nav{background:var(--nav)}.nav-flex{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:4px;min-height:50px}.nav-flex a{display:flex;align-items:center;justify-content:center;text-align:center;position:relative;color:#e2edf5;text-decoration:none;font-size:15px;font-weight:500;min-width:0;padding:7px 2px;white-space:nowrap}.nav-flex a:hover,.nav-flex a.is-active{color:#fff;font-weight:700}.nav-flex a.is-active:after{content:'';position:absolute;width:26px;height:3px;background:var(--cyan);bottom:0;left:calc(50% - 13px)}.menu-toggle,.mobile-drawer,.drawer-overlay,.nojs-nav,.mobile-quick{display:none}.page-intro{padding:54px 0 32px}.page-intro p{font-size:17px;max-width:820px}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.17em;font-weight:bold;color:#087d89;margin-bottom:12px}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:16px}.breadcrumb a{color:var(--muted)}.section-space{margin-top:58px;margin-bottom:58px}.section-heading{display:flex;gap:24px;align-items:baseline;justify-content:space-between;border-bottom:1px solid var(--line);margin-bottom:25px}.section-heading .kicker{font-size:12px;color:var(--muted);letter-spacing:.12em}.hero{display:grid;grid-template-columns:52fr 48fr;gap:44px;align-items:center;padding:55px 0 48px}.hero h1{font-size:clamp(2rem,3.4vw,2.75rem)}.hero p{max-width:580px}.hero .lede{font-size:18px;color:var(--head)}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.btn{display:inline-block;background:var(--deep);color:#fff;border-radius:9px;text-decoration:none;padding:10px 21px;font-weight:700}.btn.secondary{background:#dff3f4;color:var(--head)}.btn:hover{background:#137c8c;color:#fff}.media-frame{display:flex;align-items:center;justify-content:center;max-width:100%;min-width:0;min-height:105px;padding:8px;margin:0;border-radius:14px;background:var(--mist)}.media-frame img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--media-limit,220px);object-fit:contain;object-position:center}.media-frame--hero{--media-limit:310px}.media-frame--feature{--media-limit:250px}.media-frame--card{--media-limit:185px}.media-frame--mobile{--media-limit:350px;max-width:320px}.media-frame--banner{--media-limit:210px}.media-placeholder{display:flex;align-items:center;justify-content:center;width:100%;min-height:130px;border:1px dashed #b8cbd4;color:#607889;background:#edf4f7;border-radius:8px;font-size:13px}.topic-index{display:grid;grid-template-columns:1fr 1fr;gap:8px 40px}.topic-item{padding:20px 0;border-bottom:1px solid var(--line);min-width:0}.topic-item h3{margin:0 0 8px}.topic-item h3 a{text-decoration:none;color:var(--head)}.topic-item p{font-size:15px;margin-bottom:8px}.topic-item>a{font-size:14px;font-weight:bold}.editor-grid{display:grid;grid-template-columns:2fr 1fr;gap:22px}.lead-story{padding:32px;background:var(--nav);border-radius:14px;color:#d7e6ef}.lead-story h3{color:white;font-size:27px}.lead-story a{color:#a2e5eb}.side-stories{display:grid;gap:16px}.side-stories article{padding:22px;background:#fff;border:1px solid var(--line);border-radius:12px}.split-feature{display:grid;grid-template-columns:1fr 1.15fr;gap:35px;align-items:center}.split-feature.reverse{grid-template-columns:1.15fr 1fr}.split-feature.reverse>.media-frame{order:2}.band{background:#eaf1f6;padding:38px;border-radius:16px}.three-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.note-card{padding:23px;border:1px solid var(--line);background:#fff;border-radius:11px}.note-card:nth-child(2){transform:translateY(16px)}.note-card:nth-child(3){transform:translateY(30px)}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;counter-reset:stage}.steps article{border-top:3px solid var(--cyan);padding:17px 12px 9px;background:#fff}.steps article:before{counter-increment:stage;content:'0' counter(stage);display:block;font-size:25px;line-height:1.3;font-weight:bold;color:#0e94a1}.editors-note{padding:25px 28px;border-left:4px solid var(--cyan);background:var(--aqua)}.article-shell{padding-bottom:40px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:38px;align-items:start}.article-main{max-width:800px;min-width:0}.article-main section,.prose-section{margin-bottom:46px}.article-main h2,.prose-section h2{padding-bottom:10px;border-bottom:1px solid var(--line)}.article-main ul,.prose-section ul{padding-left:22px}.fact-aside{padding:22px;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:14px}.fact-aside ul{padding-left:20px}.anchor-nav{display:flex;flex-wrap:wrap;gap:9px;margin:2px 0 30px}.anchor-nav a{background:#e7f5f6;color:var(--head);padding:7px 13px;border:1px solid #bbdcdf;text-decoration:none;border-radius:6px;font-size:14px;font-weight:700}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:10px;background:#fff}table{border-collapse:collapse;width:100%;min-width:580px;text-align:left;font-size:15px}caption{caption-side:top;text-align:left;padding:14px 18px;font-weight:bold;color:var(--head)}th,td{padding:13px 16px;border-bottom:1px solid var(--line);vertical-align:top}th{background:#eaf1f6;color:var(--head)}tr:last-child td{border-bottom:0}.wide-table{margin:22px 0 45px}.timeline{display:grid;gap:15px;counter-reset:time}.timeline article{display:grid;grid-template-columns:55px 1fr;gap:16px;padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:10px}.timeline article:before{counter-increment:time;content:counter(time,decimal-leading-zero);font-size:26px;color:#0793a1;font-weight:bold}.timeline p{margin-bottom:0}.quote-block{border-left:4px solid var(--cyan);background:#fff;padding:23px 27px;font-size:18px;color:var(--head);margin:24px 0}.matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.matrix article{padding:24px;background:#fff;border-top:4px solid var(--deep)}.matrix article:nth-child(2){background:#e7f4f5}.gallery-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}.gallery-piece{padding:18px;background:#fff;border:1px solid var(--line);border-radius:13px}.gallery-piece:nth-child(2){margin-top:34px}.gallery-piece p{font-size:15px}.manual{max-width:830px}.rule-table table{min-width:560px}.faq-list{border-top:1px solid var(--line)}.faq-list details{background:#fff;border-bottom:1px solid var(--line);padding:5px 20px}.faq-list summary{font-weight:700;color:var(--head);cursor:pointer;padding:13px 0}.faq-list p{margin:0 0 18px}.service-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:38px;align-items:start}.service-nav{padding:20px;background:#fff;border:1px solid var(--line);border-radius:12px}.service-nav a{display:block;padding:8px 0}.service-main{max-width:820px}.service-main section{margin-bottom:46px}.related-reading{margin:55px 0 68px;padding:30px;background:#e4f2f4;border-radius:13px}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.related-links a{display:block;padding:16px;background:#fff;border-radius:8px;text-decoration:none;color:var(--head);font-weight:bold}.related-links a span{color:#098f9b}.site-footer{background:var(--footer);color:#dcecf5;padding:44px 0 15px;font-size:14px}.site-footer h2{font-size:17px;color:#fff}.footer-layout{display:grid;grid-template-columns:1.3fr 1fr;gap:60px}.footer-layout p{max-width:630px}.footer-brand{color:#fff;text-decoration:none;font-weight:bold;font-size:23px}.footer-brand span{font-size:12px;font-weight:400;letter-spacing:.1em}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px}.footer-links a{color:#dcecf5;text-decoration:none}.footer-bottom{border-top:1px solid #335165;margin-top:30px;padding-top:12px;color:#a9c6d3}.back-top{position:fixed;right:20px;bottom:20px;z-index:25;width:42px;height:42px;border:0;background:var(--deep);color:#fff;border-radius:9px}.back-top[hidden]{display:none}
@media(max-width:1024px){.container{width:calc(100% - 44px)}.hero{gap:27px}.split-feature{gap:25px}.nav-flex a{font-size:14px}}@media(max-width:920px){.brand-row{min-height:62px;justify-content:space-between;gap:12px}.menu-toggle{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;border:1px solid var(--line);border-radius:8px;background:#fff;width:40px;height:40px;flex:none}.menu-toggle span{width:19px;height:2px;background:var(--nav)}.brand{position:absolute;left:50%;transform:translateX(-50%);max-width:39%;justify-content:center}.brand img{max-width:100%;max-height:30px}.brand strong{font-size:17px}.brand small{font-size:8px}.brand-tagline,.desktop-nav{display:none}.entry-link{font-size:12px;min-height:40px;padding:0 10px}.mobile-drawer{display:block;position:fixed;top:0;left:0;bottom:0;z-index:110;width:min(86vw,340px);max-width:100%;overflow-y:auto;background:#fff;transform:translateX(-105%);visibility:hidden;transition:transform .22s ease,visibility .22s;box-shadow:0 10px 40px #081f3440}.mobile-drawer.is-open{transform:translateX(0);visibility:visible}.drawer-overlay{display:block;position:fixed;inset:0;background:rgba(7,23,36,.55);z-index:105;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.drawer-overlay.is-visible{opacity:1;visibility:visible;pointer-events:auto}.drawer-open{overflow:hidden}.drawer-top{display:flex;align-items:center;justify-content:space-between;padding:18px 21px;border-bottom:1px solid var(--line);font-weight:bold;color:var(--head)}.drawer-close{border:0;background:var(--mist);font-size:25px;line-height:1;width:38px;height:38px;border-radius:7px;color:var(--head)}.drawer-group{padding:14px 22px;border-bottom:1px solid var(--line)}.drawer-group h2{font-size:12px;letter-spacing:.12em;color:var(--muted);margin:4px 0 6px}.drawer-group a{display:block;color:var(--head);text-decoration:none;padding:10px 0;font-weight:600}.mobile-quick{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;padding:18px 0;font-size:13px}.mobile-quick a{color:var(--head)}.article-layout{grid-template-columns:minmax(0,1fr) 200px;gap:24px}}@media(max-width:760px){.hero,.split-feature,.split-feature.reverse,.editor-grid,.article-layout,.service-layout,.footer-layout{grid-template-columns:1fr}.split-feature.reverse>.media-frame{order:0}.service-main{order:0}.service-nav{order:1}.fact-aside{order:2}.three-columns,.matrix{grid-template-columns:1fr 1fr}.steps{grid-template-columns:1fr 1fr}.related-links{grid-template-columns:1fr}.page-intro{padding:38px 0 24px}.section-space{margin-top:43px;margin-bottom:43px}.hero{padding:38px 0}.hero .media-frame{max-width:100%}.note-card:nth-child(n),.gallery-piece:nth-child(2){transform:none;margin-top:0}.gallery-grid{grid-template-columns:1fr}.topic-index{gap:6px 24px}}@media(max-width:640px){body{font-size:15px;line-height:1.78}.container{width:calc(100% - 32px)}h1{font-size:clamp(25px,7vw,29px)}h2{font-size:clamp(20px,5vw,23px)}h3{font-size:18px}.hero h1{font-size:clamp(27px,7vw,32px)}.hero .lede{font-size:16px}.page-intro p{font-size:15px}.brand{max-width:41%}.brand img{max-height:29px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-frame--banner{--media-limit:135px}.topic-index,.three-columns,.matrix,.steps{grid-template-columns:1fr}.section-heading{display:block}.lead-story{padding:22px}.lead-story h3{font-size:21px}.band{padding:24px 18px}.note-card{padding:20px}.timeline article{grid-template-columns:42px 1fr;gap:10px;padding:14px}.timeline article:before{font-size:21px}.footer-layout{gap:26px}.related-reading{padding:24px 18px}.hero{gap:24px}.media-frame{padding:7px}.media-placeholder{min-height:110px}.brand strong{font-size:15px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}