:root{--bg:#F4F7FA;--white:#fff;--mist:#EAF1F6;--pale:#E9F8F8;--nav:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--title:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--body);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif}img{max-width:100%;height:auto}a{color:#1769ab;text-underline-offset:3px}a:hover{color:#07507e}button{font:inherit;cursor:pointer}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}h1,h2,h3{color:var(--title);line-height:1.38;margin:0 0 .7em}h1{font-size:clamp(27px,3.5vw,36px)}h2{font-size:clamp(21px,2.4vw,27px)}h3{font-size:clamp(18px,2vw,20px)}p{margin:0 0 1.12em}section{margin:0 0 58px;scroll-margin-top:30px}section section{margin-bottom:32px}.shell{width:min(100% - 56px,1200px);margin-inline:auto}.skip{position:absolute;z-index:1000;left:10px;top:-70px;background:white;padding:8px}.skip:focus{top:8px}.site-header{position:relative;z-index:20;background:white}.desktop-brand{display:flex;align-items:center;gap:22px;min-height:72px}.brand,.mobile-brand{display:flex;align-items:center;text-decoration:none;min-width:0;color:var(--nav)}.brand img{max-height:38px;width:auto}.brand strong{font-size:24px}.brand-tagline{font-size:13px;color:var(--muted);flex:1}.register{display:inline-flex;align-items:center;justify-content:center;border-radius:9px;min-height:40px;background:var(--nav);color:white;text-decoration:none;padding:6px 19px;font-size:14px;font-weight:700;white-space:nowrap}.register:hover{background:#1d536f;color:white}.desktop-nav{background:var(--nav)}.nav-row{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));align-items:stretch;min-height:51px}.nav-row a{display:flex;align-items:center;justify-content:center;position:relative;color:#e5f0f6;font-size:14px;font-weight:600;text-decoration:none;white-space:nowrap;padding:9px 5px}.nav-row a:hover,.nav-row a[aria-current]{color:white;background:#21465f}.nav-row a[aria-current]::after{content:'';position:absolute;bottom:0;left:31%;right:31%;height:3px;background:var(--teal)}.mobile-bar,.mobile-drawer,.drawer-shade,.nojs-nav{display:none}.breadcrumb{font-size:13px;padding:21px 0;color:var(--muted)}.breadcrumb a{text-decoration:none}.breadcrumb span{padding:0 9px}main{padding-bottom:28px}.page-intro{padding:32px 0 24px;max-width:900px}.page-intro h1{margin-bottom:18px}.eyebrow{font-size:12px;font-weight:800;letter-spacing:.18em;color:#087e92;text-transform:uppercase}.lead{font-size:17px;line-height:1.85;color:#526c7b;max-width:850px}.hero{display:grid;grid-template-columns:1.07fr .93fr;align-items:center;gap:30px;padding:43px 0 26px}.hero h1{font-size:clamp(28px,3.5vw,43px)}.hero .eyebrow{margin-bottom:16px}.hero-copy p:not(.eyebrow){max-width:620px}.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--nav);color:white;text-decoration:none;border-radius:9px;padding:9px 19px;font-weight:700}.btn.alt{background:#e4f7f8;color:#0c5264}.btn:hover{color:white;background:#17647a}.section-kicker{color:#087f8e;font-size:12px;font-weight:800;letter-spacing:.13em;text-transform:uppercase}.section-head{max-width:790px;margin-bottom:22px}.muted{color:var(--muted)}.topic-directory{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 38px}.topic-item{border-top:1px solid var(--line);padding:19px 6px 17px}.topic-item h3{margin-bottom:6px}.topic-item p{margin-bottom:7px}.editorial-grid{display:grid;grid-template-columns:2fr 1fr;gap:24px}.article-panel{background:white;border:1px solid var(--line);border-radius:12px;padding:25px}.article-panel p:last-child{margin-bottom:0}.stack{display:grid;gap:16px}.stack>*{border-top:1px solid var(--line);padding-top:17px}.split{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}.split.wide-text{grid-template-columns:2fr 1fr}.reading-steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;counter-reset:step}.reading-steps>div{border-top:3px solid var(--teal);padding:16px;background:white;counter-increment:step}.reading-steps>div:before{content:'0' counter(step);display:block;font-size:13px;color:#087d92;font-weight:800}.rule-tiles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.rule-tiles article{padding:20px;background:var(--pale);border-radius:12px}.rule-tiles article:nth-child(2){transform:translateY(15px);background:var(--mist)}.rule-tiles article:nth-child(3){transform:translateY(28px)}.declaration{border-left:4px solid var(--teal);padding:22px 28px;background:var(--mist)}.media-frame{display:flex;align-items:center;justify-content:center;width:100%;min-width:0;padding:8px;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--long{--media-limit:220px}.media-frame--mobile{--media-limit:350px;max-width:320px;margin-inline:auto}.media-frame--banner{--media-limit:210px}.media-missing{min-height:115px;border:1px dashed #c0d4e1;color:#698393;font-size:13px;text-align:center}.media-missing.media-frame--hero{min-height:175px}.chapter-layout{display:grid;grid-template-columns:minmax(0,2.5fr) minmax(205px,1fr);gap:32px;align-items:start}.fact-index{background:var(--mist);padding:21px;border-radius:12px;border-top:4px solid var(--teal)}.fact-index ul{margin:0;padding-left:20px}.prose{max-width:790px}.prose p{line-height:1.85}.anchor-nav{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 30px}.anchor-nav a{padding:7px 13px;background:white;border:1px solid var(--line);border-radius:8px;font-size:14px;text-decoration:none}.step-list{counter-reset:steps;display:grid;gap:13px;padding:0;list-style:none}.step-list li{counter-increment:steps;display:grid;grid-template-columns:40px 1fr;gap:16px;align-items:start;padding:18px;border-left:2px solid var(--line);background:white}.step-list li:before{content:counter(steps,decimal-leading-zero);color:#087f8e;font-weight:800}.table-wrap{overflow-x:auto;max-width:100%;border:1px solid var(--line);border-radius:12px;background:white}table{border-collapse:collapse;width:100%;min-width:590px;text-align:left;font-size:15px;line-height:1.65}caption{text-align:left;font-weight:800;color:var(--title);padding:16px 18px}th,td{padding:13px 17px;border-bottom:1px solid var(--line);vertical-align:top}th{background:#eaf1f6;color:var(--title);font-weight:750}tr:last-child td{border-bottom:0}.matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.matrix article{padding:22px;border:1px solid var(--line);background:white;border-radius:12px}.matrix article:nth-child(2){background:var(--pale)}.quote-band{background:var(--deep);color:#e9f3f8;padding:30px;border-radius:12px}.quote-band h2,.quote-band h3{color:white}.gallery{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:start}.gallery figure{margin:0}.gallery figure:nth-child(2){margin-top:40px}.gallery figcaption{font-size:14px;color:var(--muted);margin-top:12px}.handbook{max-width:900px}.handbook section{padding-bottom:26px;border-bottom:1px solid var(--line)}.faq details{background:white;border:1px solid var(--line);border-radius:9px;padding:13px 18px;margin:10px 0}.faq summary{font-weight:700;color:var(--title);cursor:pointer}.faq details p{padding-top:10px;margin-bottom:2px}.service-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:36px;align-items:start}.service-aside{background:var(--mist);padding:20px;border-radius:12px}.service-aside a{display:block;padding:7px 0}.service-body section{margin-bottom:42px}.related{border-top:2px solid var(--line);padding:27px 0 0;margin:30px 0 35px}.related-links{display:flex;flex-wrap:wrap;gap:13px}.related-links a{background:white;padding:10px 15px;border:1px solid var(--line);border-radius:8px;text-decoration:none}.mobile-quick{display:none}.site-footer{background:#0B2539;color:#DCECF5;padding:35px 0 18px}.footer-grid{display:grid;grid-template-columns:2fr 1fr;gap:40px}.footer-title{font-size:19px;color:white}.footer-title small{font-size:11px;font-weight:400;letter-spacing:.12em;margin-left:5px}.site-footer a{color:#DCECF5}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 12px;margin-top:10px}.foot-note{border-top:1px solid #2b4d63;padding-top:13px;font-size:12px;color:#b2c9d7}.back-top{position:fixed;right:22px;bottom:22px;width:42px;height:42px;background:#102E46;color:white;border:0;border-radius:50%;opacity:0;visibility:hidden;transition:opacity .2s}.back-top.shown{visibility:visible;opacity:1} .divider-section{border-top:1px solid var(--line);padding-top:28px}.notice{padding:17px 22px;background:var(--pale);border-left:3px solid var(--teal)}
@media(max-width:1024px){.shell{width:calc(100% - 44px)}.editorial-grid{grid-template-columns:1.7fr 1fr}.hero{gap:22px}}
@media(max-width:920px){.desktop-brand,.desktop-nav{display:none}.mobile-bar{height:64px;display:grid;grid-template-columns:42px minmax(0,1fr) auto;align-items:center;gap:12px;padding:0 22px}.mobile-brand{justify-content:center}.mobile-brand img{max-height:30px;max-width:min(100%,180px);width:auto}.mobile-brand strong{font-size:21px}.mobile-bar .register{padding:5px 12px;font-size:13px}.menu-button{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:40px;height:40px;background:white;border:1px solid var(--line);border-radius:8px}.menu-button span{width:19px;height:2px;background:var(--nav)}.drawer-shade{display:block;position:fixed;inset:0;background:rgba(3,21,34,.55);opacity:0;visibility:hidden;pointer-events:none;z-index:50;transition:opacity .18s,visibility .18s}.drawer-shade.is-visible{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{display:flex;flex-direction:column;position:fixed;left:0;top:0;bottom:0;width:min(86vw,340px);overflow-y:auto;background:white;z-index:51;padding:14px 23px 25px;transform:translateX(-103%);visibility:hidden;transition:transform .22s,visibility .22s}.mobile-drawer.is-open{transform:translateX(0);visibility:visible}.drawer-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding:1px 0 8px}.drawer-close{border:0;background:var(--mist);color:var(--nav);font-size:27px;line-height:1;width:40px;height:40px;border-radius:8px}.drawer-group{margin:20px 0 3px;font-size:12px;color:var(--muted);font-weight:700}.mobile-drawer>a{padding:8px 0;text-decoration:none;font-weight:600;color:var(--title);border-bottom:1px solid #edf2f5}.menu-open{overflow:hidden}.nojs-nav{display:flex;flex-wrap:wrap;gap:8px;padding:10px 22px;background:white;border-top:1px solid var(--line)}.nojs-nav a{padding:2px 8px}.mobile-quick{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;padding:18px 0 3px;border-top:1px solid var(--line)}.mobile-quick a{font-size:13px}}
@media(max-width:760px){.chapter-layout,.service-layout,.split,.split.wide-text,.gallery,.editorial-grid,.hero,.footer-grid{grid-template-columns:1fr}.hero{padding:25px 0}.gallery figure:nth-child(2){margin-top:0}.matrix{grid-template-columns:1fr}.reading-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.rule-tiles{grid-template-columns:1fr}.rule-tiles article:nth-child(n){transform:none}.service-body{order:1}.service-aside{order:2}.chapter-layout aside{order:2}.chapter-layout>div{order:1}.hero-copy{order:1}.hero>.media-frame{order:2}.footer-grid{gap:15px}}
@media(max-width:640px){body{font-size:15px;line-height:1.78}.shell{width:calc(100% - 32px)}.mobile-bar{padding:0 16px}.page-intro{padding-top:12px}h1{font-size:clamp(25px,7vw,29px)}h2{font-size:21px}h3{font-size:18px}.lead{font-size:15px}section{margin-bottom:36px}.hero h1{font-size:29px}.topic-directory{grid-template-columns:1fr}.article-panel{padding:18px}.reading-steps{grid-template-columns:1fr}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--long{--media-limit:175px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-frame--banner{--media-limit:135px}.quote-band{padding:20px}.related-links a{font-size:14px}.anchor-nav{gap:8px}.anchor-nav a{font-size:13px}.step-list li{padding:12px;gap:8px}.footer-links{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}