:root{--bg:#F4F7FA;--paper:#fff;--muted-bg:#EAF1F6;--soft:#E9F8F8;--nav:#102E46;--deep:#163C57;--teal:#13B8C5;--active:#237BD3;--heading:#18364B;--text:#344C60;--muted:#64798A;--line:#DCE6ED;--radius:14px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 Arial,'PingFang SC','Microsoft YaHei',sans-serif;overflow-wrap:break-word}a{color:#176caa;text-decoration-thickness:1px;text-underline-offset:4px}a:hover{color:#086b78}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #13b8c5;outline-offset:3px}button{font:inherit;cursor:pointer}h1,h2,h3{color:var(--heading);line-height:1.38;margin:0 0 .75em}h1{font-size:clamp(2rem,3vw,2.25rem)}h2{font-size:clamp(1.45rem,2.2vw,1.72rem)}h3{font-size:1.2rem}p{margin:0 0 1.15em}ul,ol{padding-left:1.35em}li{margin:.3em 0}figure{margin:0}.shell{width:min(100% - 56px,1200px);margin-inline:auto}.reading{max-width:790px}.eyebrow{font-size:.8rem;font-weight:700;letter-spacing:.12em;color:#0a7886;text-transform:uppercase;margin-bottom:12px}.lead{font-size:1.08rem;line-height:1.85;color:#456176}.section{margin-block:60px}.section-heading{margin-bottom:25px}.section-heading p{max-width:740px}.skip-link{position:absolute;z-index:80;left:15px;top:-100px;background:white;padding:8px 15px}.skip-link:focus{top:10px}.brand-strip{background:#fff;border-bottom:1px solid var(--line)}.brand-inner{height:72px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;flex-shrink:0;min-width:0;color:var(--nav);text-decoration:none}.brand img{display:block;width:auto;height:auto;max-height:38px;max-width:240px;object-fit:contain}.brand-fallback{font-size:1.3rem;font-weight:800;white-space:nowrap}.brand-fallback 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a[aria-current]::after{content:'';position:absolute;left:24%;right:24%;bottom:0;height:3px;background:var(--teal)}.menu-toggle{display:none}.drawer-backdrop,.mobile-drawer{visibility:hidden;pointer-events:none}.nojs-nav{display:none}.page-top{padding:50px 0 28px}.page-top .lead{max-width:840px}.breadcrumbs{font-size:.85rem;color:var(--muted);margin-bottom:18px}.breadcrumbs a{color:inherit}.page-top--dark{background:var(--nav);color:#d9eaf4;padding:48px 0}.page-top--dark h1{color:#fff}.page-top--dark .lead{color:#c9e1ec}.page-top--dark .eyebrow{color:#76ebee}.page-top--dark .breadcrumbs{color:#c0d3de}.hero{display:grid;grid-template-columns:minmax(0,52fr) minmax(0,48fr);gap:36px;align-items:center;padding-block:52px 28px}.hero h1{font-size:clamp(2rem,3.5vw,2.75rem);margin-bottom:20px}.hero-copy p{max-width:630px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:25px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 20px;border-radius:9px;background:var(--nav);font-weight:700;color:#fff;text-decoration:none}.btn:hover{background:#126b83;color:white}.btn--light{background:#e2f5f6;color:#115569}.btn--light:hover{background:#c6ecee;color:#124959}.media-frame{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;padding:8px;background:var(--muted-bg);border-radius:14px;border:1px solid var(--line);overflow:hidden}.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--banner{--media-limit:210px}.media-frame--mobile{--media-limit:350px;max-width:320px;margin-inline:auto}.media-placeholder{min-height:130px;background:repeating-linear-gradient(135deg,#eaf1f6,#eaf1f6 15px,#f4f8fa 15px,#f4f8fa 30px);color:#627d8f;text-align:center;font-size:.86rem}.media-placeholder span{padding:20px}.media-frame--hero.media-placeholder{min-height:210px}.topic-index{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px;border-top:2px solid var(--nav)}.topic-index article{display:grid;grid-template-columns:50px 1fr;gap:12px;padding:24px 0;border-bottom:1px solid var(--line);min-width:0}.topic-number{color:#0b8f9a;font-size:1.2rem;font-weight:800}.topic-index h3{margin-bottom:8px}.topic-index p{margin-bottom:9px;font-size:.96rem}.editorial-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:22px}.feature-story{padding:34px;background:var(--nav);color:#d3e6ed;border-radius:14px}.feature-story h3{font-size:1.5rem;color:#fff}.feature-story a{color:#9df1ee}.story-stack{display:grid;gap:15px}.story-stack article{border-left:3px solid var(--teal);padding:19px 22px;background:#fff}.story-stack article h3{margin-bottom:8px}.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.25fr);gap:35px;align-items:center}.split--reverse{grid-template-columns:minmax(0,1.25fr) minmax(0,1fr)}.split>*{min-width:0}.soft-band{background:var(--soft);padding:35px;border-radius:var(--radius)}.dark-band{background:var(--deep);color:#e0edf4;padding:30px;border-radius:var(--radius)}.dark-band h2,.dark-band h3{color:white}.mini-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.mini-columns article{border-top:3px solid var(--teal);padding:19px;background:#fff}.mini-columns article p:last-child{margin:0}.pathways{counter-reset:path;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.pathways article{position:relative;border-top:1px solid #a8c7d6;padding-top:20px}.pathways article:before{counter-increment:path;content:'0' counter(path);display:block;color:#0699a6;font-weight:800;font-size:1.35rem;margin-bottom:12px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:50px;align-items:start}.article-body{min-width:0}.article-body section{margin-block:40px}.article-body h2{padding-top:3px}.fact-box{background:#e9f8f8;border-left:4px solid var(--teal);padding:22px;margin:24px 0}.side-index{position:sticky;top:22px;background:white;border:1px solid var(--line);border-radius:12px;padding:21px}.side-index h2{font-size:1.1rem}.side-index a{display:block;padding:9px 0;border-bottom:1px solid var(--line)}.anchor-nav{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0 36px}.anchor-nav a{background:white;border:1px solid #cadae3;padding:7px 16px;border-radius:25px;text-decoration:none;font-weight:700}.comparison{overflow-x:auto;max-width:100%;border-radius:12px;border:1px solid var(--line);background:white}.comparison table{border-collapse:collapse;width:100%;min-width:590px;text-align:left}.comparison caption{caption-side:top;text-align:left;font-weight:bold;padding:14px 18px;color:var(--heading)}.comparison th,.comparison td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}.comparison th{background:#eaf1f6;color:var(--heading)}.comparison tr:last-child td{border-bottom:0}.timeline{counter-reset:steps;display:grid;gap:13px}.timeline article{padding:22px 25px 22px 76px;background:white;border:1px solid var(--line);border-radius:11px;position:relative}.timeline article:before{counter-increment:steps;content:counter(steps);position:absolute;top:21px;left:22px;background:var(--nav);color:white;width:35px;height:35px;display:grid;place-items:center;border-radius:50%;font-weight:700}.timeline h3{margin-bottom:8px}.section-card{background:white;border:1px solid var(--line);padding:25px;border-radius:13px}.two-columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}.two-columns>*{min-width:0}.knowledge-matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.knowledge-matrix article{background:white;padding:22px;border:1px solid var(--line);border-top:4px solid var(--teal);border-radius:8px}.gallery-layout{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:35px;align-items:start}.gallery-layout article:nth-child(even){margin-top:38px}.gallery-layout article{background:white;border:1px solid var(--line);border-radius:14px;padding:18px}.gallery-layout .media-frame{margin-bottom:18px}.rule-index{max-width:790px;padding:25px;background:white;border:1px solid var(--line);border-radius:12px}.rule-index a{display:block;padding:8px 0}.faq details{background:white;border:1px solid var(--line);border-radius:9px;padding:13px 19px;margin-bottom:10px}.faq summary{font-weight:700;cursor:pointer;color:var(--heading)}.faq details p{margin:13px 0 4px}.service-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:45px}.service-nav{background:#eaf1f6;padding:20px;border-radius:12px;align-self:start}.service-nav a{display:block;padding:8px 0}.service-main{min-width:0}.service-main section{margin-bottom:40px}.related{margin-block:56px 64px;padding-top:25px;border-top:2px solid var(--nav)}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.related-links a{padding:18px;background:white;border:1px solid var(--line);border-radius:10px;text-decoration:none;font-weight:700;display:flex;justify-content:space-between;gap:10px}.notice{font-size:.92rem;color:var(--muted);padding:16px 0;border-top:1px solid var(--line)}.site-footer{background:#0B2539;color:#DCECF5;padding:44px 0 16px}.footer-grid{display:grid;grid-template-columns:1.7fr 1fr;gap:55px}.site-footer strong{color:white;font-size:1.25rem}.site-footer strong span{font-size:.8rem;opacity:.7}.site-footer p{max-width:640px;font-size:.92rem}.site-footer h2{font-size:1.1rem;color:white}.site-footer nav{display:grid;grid-template-columns:1fr 1fr;gap:3px 15px}.site-footer a{color:#dcecf5;text-decoration:none}.site-footer a:hover{text-decoration:underline}.copyright{border-top:1px solid #335269;padding-top:17px;margin-top:28px;font-size:.81rem}.mobile-quick{display:none}.back-to-top{position:fixed;right:18px;bottom:22px;border:0;background:var(--nav);color:white;border-radius:50%;width:42px;height:42px;z-index:20}.back-to-top[hidden]{display:none}
@media(max-width:1024px){.shell{width:min(100% - 44px,1200px)}.brand-tagline{font-size:.78rem}.article-layout{gap:27px;grid-template-columns:minmax(0,1fr) 220px}}
@media(max-width:920px){.brand-inner{height:62px;gap:12px;justify-content:space-between}.menu-toggle{width:40px;height:40px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:10px;display:flex;flex-direction:column;justify-content:space-around;flex-shrink:0}.menu-toggle span{height:2px;width:100%;background:var(--nav)}.brand{position:absolute;left:50%;transform:translateX(-50%);max-width:calc(100% - 190px)}.brand img{max-height:30px;max-width:100%}.brand-fallback{font-size:1.02rem}.brand-tagline,.desktop-nav{display:none}.entry-link{margin-left:auto;height:40px;min-height:40px;padding:0 10px;font-size:.81rem}.drawer-backdrop{position:fixed;inset:0;z-index:45;background:rgba(5,22,34,.55);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{position:fixed;z-index:46;inset:0 auto 0 0;width:min(86vw,340px);overflow-y:auto;background:#fff;visibility:hidden;pointer-events:none;transform:translateX(-105%);transition:transform .23s,visibility .23s;box-shadow:8px 0 30px #08203420}.drawer-open{overflow:hidden}.drawer-open .drawer-backdrop{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{visibility:visible;pointer-events:auto;transform:translateX(0)}.drawer-head{display:flex;justify-content:space-between;align-items:center;padding:19px 20px;border-bottom:1px solid var(--line)}.drawer-close{width:40px;height:40px;border:0;border-radius:8px;font-size:27px;background:#eaf1f6}.mobile-drawer nav{padding:15px 24px 35px}.mobile-drawer nav p{font-weight:700;color:#6d8191;font-size:.8rem;margin:15px 0 3px}.mobile-drawer nav a{display:block;padding:10px 4px;color:var(--nav);text-decoration:none;border-bottom:1px solid var(--line)}.nojs-nav{display:flex;gap:12px;flex-wrap:wrap;padding-block:10px}.nojs-nav a{padding:4px}.mobile-quick{display:flex;justify-content:space-around;gap:8px;padding-block:20px;font-size:.87rem}.mobile-quick a{white-space:nowrap}}
@media(max-width:760px){.hero,.split,.split--reverse,.article-layout,.service-layout{grid-template-columns:minmax(0,1fr)}.hero{gap:22px}.article-layout .side-index{position:static}.service-main{order:0}.service-nav{order:1}.editorial-grid,.gallery-layout,.two-columns{grid-template-columns:minmax(0,1fr)}.gallery-layout article:nth-child(even){margin-top:0}.knowledge-matrix{grid-template-columns:minmax(0,1fr)}.pathways{grid-template-columns:repeat(2,minmax(0,1fr))}.mini-columns{grid-template-columns:1fr}.related-links{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr;gap:20px}}
@media(max-width:640px){.shell{width:calc(100% - 32px)}body{font-size:15px;line-height:1.78}h1{font-size:clamp(1.58rem,6.6vw,1.82rem)}h2{font-size:1.36rem}h3{font-size:1.08rem}.hero{padding-block:28px 8px}.hero h1{font-size:clamp(1.7rem,7.7vw,2rem)}.lead{font-size:1rem}.page-top{padding:30px 0 18px}.page-top--dark{padding:30px 0}.section{margin-block:36px}.topic-index{grid-template-columns:1fr}.topic-index article{padding:18px 0;grid-template-columns:40px 1fr}.soft-band,.feature-story,.dark-band{padding:21px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--banner{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-frame--hero.media-placeholder{min-height:140px}.pathways{gap:12px}.pathways article{font-size:.92rem}.section-card{padding:18px}.related{margin-block:37px}.site-footer{padding-top:34px}.brand{max-width:calc(100% - 160px)}.brand img{max-height:28px}.brand-fallback{font-size:.85rem}.brand-fallback small{font-size:.48rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}