*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}body{margin:0;background:#F6F8F8;color:#374D58;font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif}h1,h2,h3,p{margin-top:0}h1,h2,h3{color:#193946;line-height:1.35}h1{font-size:clamp(34px,3.1vw,42px);letter-spacing:-.02em}h2{font-size:clamp(24px,2.2vw,28px)}h3{font-size:20px}p{margin-bottom:1.15em}a{color:#226D9D;text-underline-offset:4px}a:hover{color:#168E96}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #168E96;outline-offset:3px}img{max-width:100%}.site-header{background:#122E3B;color:#fff;position:relative;z-index:20}.header-inner{max-width:1220px;margin:auto;min-height:76px;padding:0 28px;display:flex;align-items:center;gap:18px;min-width:0}.brand{display:flex;align-items:center;gap:9px;flex:0 0 auto;color:#fff;text-decoration:none;font-size:11px;letter-spacing:.08em;white-space:nowrap}.brand .image-holder{background:none;padding:0;width:auto;border-radius:0}.brand img{max-height:38px;width:auto;max-width:110px}.desktop-nav{display:flex;justify-content:center;align-items:center;gap:clamp(7px,1.2vw,18px);flex:1;min-width:0}.desktop-nav a{color:#E2ECEE;text-decoration:none;font-size:13px;white-space:nowrap;border-bottom:2px solid transparent;padding:9px 0}.desktop-nav a[aria-current=page]{border-color:#5CD0CA;font-weight:700;color:#fff}.desktop-nav a:hover{color:#8FDEDA}.entry-link{background:#168E96;color:white;border:1px solid #47B5B9;border-radius:8px;padding:6px 12px;text-decoration:none;white-space:nowrap;font-size:14px}.entry-link:hover{color:white;background:#13757d}.menu-toggle,.mobile-menu,.nojs-nav{display:none}.page-wrap{max-width:1220px;margin:auto;padding:22px 28px 70px}.breadcrumb{font-size:13px;color:#647981;margin-bottom:27px}.breadcrumb a{text-decoration:none}.eyebrow{color:#168E96;font-size:13px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}.lede{font-size:18px;max-width:770px;line-height:1.85}.hero-layout,.split,.split-reverse{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,.85fr);gap:32px;align-items:center}.split-reverse{grid-template-columns:minmax(0,.85fr) minmax(0,1.25fr)}.intro-strip{padding:32px 34px;background:#fff;border-top:4px solid #168E96;border-radius:8px}.hero-layout{background:#fff;padding:36px;border-radius:12px}.hero-layout h1{max-width:700px}.action-links{display:flex;gap:20px;flex-wrap:wrap;margin:22px 0 0;font-weight:700}.section{margin-top:56px}.section-head{max-width:790px;margin-bottom:24px}.section-head .eyebrow{margin-bottom:8px}.prose{max-width:760px}.prose p{line-height:1.85}.editorial-panel{background:#fff;padding:28px;border:1px solid #D9E3E6;border-radius:10px}.soft-panel{background:#EAF0F2;padding:26px;border-radius:10px}.dark-panel{background:#1A4050;color:#EAF6F6;padding:28px;border-radius:10px}.dark-panel h2,.dark-panel h3{color:#fff}.topic-groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.topic-group{background:#fff;padding:21px 24px;border-left:3px solid #168E96}.topic-item+.topic-item{border-top:1px solid #D9E3E6;padding-top:15px;margin-top:15px}.topic-item h3{font-size:17px;margin:0 0 5px}.topic-item p{font-size:14px;margin-bottom:5px}.number{color:#168E96;font-size:12px;font-weight:700}.reading-stages{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.reading-stages>div{padding:18px 20px;border-top:2px solid #168E96;background:#fff}.reading-stages strong{display:block;color:#193946}.image-holder{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;padding:8px;background:#EAF0F2;border-radius:12px}.image-holder img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--image-limit,210px);object-fit:contain;object-position:center}.image-holder--logo{padding:0;background:none}.image-holder--logo img{max-height:38px}.image-holder--hero{--image-limit:290px}.image-holder--feature{--image-limit:240px}.image-holder--inline{--image-limit:180px}.image-holder--portrait{--image-limit:330px;max-width:310px;margin-inline:auto}.image-holder--banner{--image-limit:190px}.image-holder--rules{--image-limit:210px}.image-missing{font-size:13px;margin:0;color:#647981;background:#EAF0F2;padding:12px;border-radius:8px}.chapter-index{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 32px}.chapter-index a{padding:7px 13px;border-radius:6px;border:1px solid #C6D9DC;text-decoration:none;font-size:14px;background:#fff}.chapter-index a:hover{background:#EAF0F2}.article-grid{display:grid;grid-template-columns:minmax(190px,230px) minmax(0,1fr);gap:30px;align-items:start}.sticky-index{position:sticky;top:18px;background:#EAF0F2;padding:20px;border-radius:8px}.sticky-index a{display:block;margin-top:10px}.article-section{padding:28px 0;border-bottom:1px solid #D9E3E6;scroll-margin-top:90px}.article-section:first-child{padding-top:0}.article-section h2{margin-bottom:18px}.article-section h3{margin-top:18px}.full-span{grid-column:1/-1}.compare-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.compare-grid>div{padding:22px;background:#fff;border-top:3px solid #168E96}.steps{counter-reset:step;list-style:none;padding-left:0}.steps li{counter-increment:step;padding:14px 15px 14px 55px;margin:10px 0;background:#fff;position:relative;border-left:2px solid #168E96}.steps li:before{content:counter(step,decimal-leading-zero);position:absolute;left:13px;color:#168E96;font-weight:700}.article-note{border-left:3px solid #168E96;padding:12px 18px;background:#EAF0F2;font-size:14px;margin:18px 0}.table-scroll{overflow-x:auto;max-width:100%;border:1px solid #D9E3E6;border-radius:8px;background:#fff}table{border-collapse:collapse;width:100%;min-width:570px;font-size:15px}caption{text-align:left;font-weight:700;color:#193946;padding:14px}th,td{padding:13px 16px;text-align:left;vertical-align:top;border-bottom:1px solid #D9E3E6}th{background:#EAF0F2;color:#193946}tr:last-child td{border-bottom:0}.faq details{background:#fff;border:1px solid #D9E3E6;border-radius:7px;padding:14px 19px;margin:10px 0}.faq summary{cursor:pointer;color:#193946;font-weight:700}.faq details p{margin:12px 0 0}.related{border-top:1px solid #D9E3E6;margin-top:35px;padding-top:24px}.related a{margin-right:18px}.site-footer{background:#0C2632;color:#C5D6DC}.footer-inner{max-width:1220px;margin:auto;padding:40px 28px 25px}.footer-top{display:grid;grid-template-columns:1fr 1.4fr;gap:40px}.footer-top>div{max-width:420px}.footer-brand{font-size:20px;font-weight:700;color:white}.footer-brand small{font-size:11px;letter-spacing:.12em}.footer-top nav{display:flex;flex-wrap:wrap;gap:8px 24px;align-content:start}.footer-top a{color:#DEEDEF;font-size:14px}.footer-note{font-size:12px;border-top:1px solid #34515B;margin:24px 0 0;padding-top:18px}.callout-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.callout-list>div{background:#fff;padding:20px 22px}.mini-kicker{font-size:12px;letter-spacing:.1em;font-weight:bold;color:#168E96}.align-center{text-align:center}.wide-article{max-width:850px;margin:auto}.side-by-side{display:grid;grid-template-columns:1fr 1fr;gap:24px}.service-grid{display:grid;grid-template-columns:1fr 2fr;gap:30px}.service-index{background:#1A4050;color:#fff;padding:26px;border-radius:9px}.service-index h2{color:white}.service-index a{color:#B9E8E9}.service-index a{display:block;margin:8px 0}.feature-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:start}.chapter-overline{color:#168E96;font-size:13px;letter-spacing:.08em}.end-summary{padding:28px;background:#1A4050;color:#EAF6F6;border-radius:10px}.end-summary h2{color:white}@media(max-width:1150px){.brand-text{display:none}.desktop-nav{gap:9px}.header-inner{gap:12px}.desktop-nav a{font-size:12px}}@media(max-width:980px){.header-inner{min-height:64px;justify-content:space-between;padding:0 22px}.desktop-nav{display:none}.menu-toggle{display:block;appearance:none;border:0;background:none;color:#fff;font-size:24px;cursor:pointer;width:42px;height:42px}.brand{margin-left:auto;margin-right:auto}.brand .image-holder img{max-height:30px}.mobile-menu.is-open{display:block;position:absolute;top:100%;left:0;right:0;background:#1A4050;box-shadow:0 8px 15px #102D3B25}.mobile-menu-inner{max-width:980px;margin:auto;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;padding:22px}.mobile-menu strong{display:block;color:#8FDEDA;font-size:13px}.mobile-menu a{display:block;color:#fff;padding:7px 0;text-decoration:none}.menu-close{background:transparent;color:white;border:1px solid #8FDEDA;border-radius:6px;padding:6px 10px;cursor:pointer}.nojs-nav{display:none;background:#1A4050;padding:8px 22px;color:white}.nojs-nav summary{cursor:pointer}.nojs-nav nav{display:flex;flex-wrap:wrap;gap:12px}.nojs-nav a{color:white}.page-wrap{padding:22px 22px 56px}}@media(max-width:760px){.hero-layout,.split,.split-reverse,.article-grid,.feature-grid,.service-grid,.side-by-side{grid-template-columns:1fr}.sticky-index{position:static}.topic-groups{grid-template-columns:1fr}.reading-stages{grid-template-columns:repeat(2,minmax(0,1fr))}.compare-grid{grid-template-columns:1fr}.full-span{grid-column:auto}.footer-top{grid-template-columns:1fr}.callout-list{grid-template-columns:1fr}.section{margin-top:40px}.mobile-menu-inner{grid-template-columns:1fr 1fr}}@media(max-width:640px){body{font-size:15px;line-height:1.78}h1{font-size:28px}h2{font-size:22px}h3{font-size:18px}.page-wrap{padding:18px 16px 42px}.header-inner{padding:0 16px}.entry-link{padding:6px 9px;font-size:12px}.intro-strip,.hero-layout{padding:23px 18px}.editorial-panel,.soft-panel,.dark-panel{padding:20px}.mobile-menu-inner{grid-template-columns:1fr;gap:10px;padding:14px 20px}.image-holder--hero{--image-limit:195px}.image-holder--feature{--image-limit:180px}.image-holder--inline{--image-limit:140px}.image-holder--portrait{--image-limit:275px;max-width:240px}.image-holder--rules{--image-limit:165px}.image-holder--banner{--image-limit:125px}.image-holder--logo img{max-height:30px}.section{margin-top:32px}.reading-stages{grid-template-columns:1fr}.footer-inner{padding:30px 16px}.lede{font-size:16px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}