:root{--bg:#F4F7FA;--paper:#fff;--soft:#EAF1F6;--mint:#E9F8F8;--nav:#102E46;--deep:#163C57;--cyan:#13B8C5;--blue:#237BD3;--heading:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:22px}body{margin:0;background:var(--bg);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--body);font-size:16px;line-height:1.8;overflow-wrap:break-word}button{font:inherit}a{color:#16649c;text-underline-offset:3px}a:hover{color:#0b7483}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}img{max-width:100%}.container{width:min(100% - 56px,1200px);margin-inline:auto}main{min-height:55vh}section{scroll-margin-top:30px}h1,h2,h3{color:var(--heading);line-height:1.38;margin:0 0 .75em;font-weight:750}h1{font-size:clamp(2rem,3.1vw,2.65rem);letter-spacing:-.03em}h2{font-size:clamp(1.5rem,2.2vw,1.75rem)}h3{font-size:1.21rem}p{margin:0 0 1.15em}p:last-child{margin-bottom:0}.eyebrow{display:inline-block;color:#087f90;font-size:.78rem;font-weight:750;letter-spacing:.13em;margin-bottom:14px;text-transform:uppercase}.lead{font-size:1.07rem;color:#435d72}.muted{color:var(--muted)}.section-gap{margin-block:60px}.section-head{max-width:760px;margin-bottom:24px}.section-head p{color:var(--muted)}.skip-link{position:absolute;top:-70px;left:16px;z-index:999;background:#fff;padding:8px 14px}.skip-link:focus{top:8px}.brand-bar{background:white;border-bottom:1px solid var(--line)}.brand-inner{height:72px;display:flex;align-items:center;gap:24px}.brand-logo{display:inline-flex;align-items:center;text-decoration:none;color:var(--nav);flex-shrink:0}.brand-logo .media-frame{background:transparent;border:0;padding:0;margin:0;display:block}.brand-logo .media-frame img{max-height:38px}.wordmark{display:flex;flex-direction:column;line-height:1.1}.wordmark strong{font-size:1.28rem;letter-spacing:.04em}.wordmark small{font-size:.55rem;letter-spacing:.18em;margin-top:4px}.brand-subtitle{font-size:.84rem;color:var(--muted);border-left:1px solid var(--line);padding-left:21px}.register-link{margin-left:auto;background:var(--deep);color:white;text-decoration:none;padding:6px 20px;min-height:40px;display:inline-flex;align-items:center;justify-content:center;border-radius:9px;font-size:.9rem;font-weight:700;white-space:nowrap}.register-link:hover{color:white;background:#0a566e}.desktop-nav{background:var(--nav)}.nav-inner{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));height:52px}.nav-inner a{min-width:0;display:flex;align-items:center;justify-content:center;position:relative;white-space:nowrap;text-decoration:none;color:#d4e5ef;font-size:.93rem}.nav-inner a:hover,.nav-inner a.is-current{background:rgba(255,255,255,.06);color:#fff;font-weight:700}.nav-inner a.is-current:after{content:"";position:absolute;bottom:0;left:34%;right:34%;height:3px;background:var(--cyan)}.menu-toggle,.mobile-drawer,.drawer-backdrop,.mobile-quick{display:none}.page-main{padding:35px 0 10px}.breadcrumb{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:.82rem;margin-bottom:32px}.breadcrumb a{text-decoration:none}.intro-band{border-left:5px solid var(--cyan);padding:23px 28px;background:var(--paper);margin-bottom:48px}.intro-band h1{font-size:clamp(1.8rem,2.7vw,2.3rem)}.intro-band p{max-width:860px}.page-strap{font-size:.82rem;color:#078394;font-weight:700;margin-bottom:9px}.editorial-columns{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(240px,.8fr);gap:50px;align-items:start}.article-text{max-width:790px}.article-text p{line-height:1.84}.article-text h2{margin-top:1.55em}.article-text h3{margin-top:1.2em}.article-text ul,.article-text ol{padding-left:1.45em}.article-text li{margin-bottom:.5em}.article-text .media-frame{margin:24px 0}.note-panel{background:var(--mint);border-left:3px solid var(--cyan);padding:20px 24px;margin:26px 0}.small-index{background:var(--soft);padding:25px;border-radius:12px}.small-index a{display:block;padding:10px 0;text-decoration:none;border-bottom:1px solid #cfdee8}.small-index a:last-child{border:0}.anchor-nav{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:36px}.anchor-nav a{background:#fff;border:1px solid var(--line);padding:8px 16px;border-radius:7px;text-decoration:none;font-weight:650;font-size:.9rem}.anchor-nav a:hover{border-color:var(--cyan)}.media-frame{display:flex;align-items:center;justify-content:center;min-width:0;width:100%;max-width:100%;padding:9px;margin:0;background:var(--soft);border:1px solid var(--line);border-radius:13px;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;aspect-ratio:auto}.media-frame--hero{--media-limit:310px}.media-frame--feature{--media-limit:250px}.media-frame--card{--media-limit:185px}.media-frame--wide{--media-limit:210px}.media-frame--mobile{--media-limit:350px;max-width:320px}.media-frame--logo{--media-limit:38px}.media-missing{min-height:110px;background:repeating-linear-gradient(-45deg,#eaf1f6,#eaf1f6 15px,#eef5f8 15px,#eef5f8 30px);color:#657b8c;font-size:.86rem;text-align:center}.media-frame--hero.media-missing{min-height:210px}.media-frame--logo.media-missing{min-height:0}.hero-editorial{display:grid;grid-template-columns:1.07fr .93fr;gap:40px;align-items:center;padding:30px 0 10px}.hero-editorial h1{font-size:clamp(2rem,3.5vw,2.75rem)}.hero-editorial .lead{max-width:620px}.action-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:25px}.btn{display:inline-flex;align-items:center;justify-content:center;background:var(--nav);color:#fff;min-height:44px;padding:10px 19px;border-radius:9px;text-decoration:none;font-size:.92rem;font-weight:700}.btn:hover{color:#fff;background:#0d5b76}.btn-outline{background:white;color:var(--nav);border:1px solid #9cb6c7}.btn-outline:hover{background:var(--soft);color:var(--nav)}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 34px}.topic-item{display:grid;grid-template-columns:44px 1fr;gap:12px;padding:20px 0;border-top:1px solid var(--line)}.topic-number{color:#0f98a7;font-size:1.1rem;font-weight:800}.topic-item h3{margin:0 0 7px}.topic-item h3 a{text-decoration:none;color:var(--heading)}.topic-item p{color:var(--muted);font-size:.94rem;margin:0}.feature-focus{display:grid;grid-template-columns:1.9fr 1fr;gap:30px}.focus-main{background:#fff;padding:32px;border-top:4px solid var(--cyan)}.focus-side{display:grid;gap:16px}.focus-side article{padding:23px;background:var(--soft)}.focus-side h3{margin-bottom:8px}.split-band{display:grid;grid-template-columns:.9fr 1.1fr;gap:36px;align-items:center}.split-band.reverse{grid-template-columns:1.1fr .9fr}.split-band.reverse .media-frame{order:2}.visual-band{background:#e8f4f6;padding:30px;border-radius:12px}.rule-tiles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.rule-tiles article{padding:24px;border-top:3px solid var(--cyan);background:#fff}.rule-tiles article:nth-child(2){transform:translateY(12px);border-color:var(--blue)}.rule-tiles article:nth-child(3){transform:translateY(24px);border-color:var(--deep)}.reading-road{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;counter-reset:step}.reading-road a{padding:18px;display:block;border-top:2px solid var(--cyan);background:#fff;color:var(--heading);text-decoration:none;font-weight:700}.reading-road a:before{counter-increment:step;content:"0" counter(step);display:block;color:#0b8e9d;margin-bottom:9px;font-size:.85rem}.editor-note{background:var(--deep);padding:30px;color:#eaf4fb}.editor-note h2{color:white}.related-reading{margin:65px 0 38px;border-top:1px solid var(--line);padding-top:28px}.related-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.related-links a{background:white;border:1px solid var(--line);border-radius:9px;padding:17px;color:var(--heading);text-decoration:none;font-weight:700;display:flex;justify-content:space-between;gap:8px}.related-links a span{color:#088e9e}.table-scroll{overflow-x:auto;margin:24px 0;border:1px solid var(--line);border-radius:10px;background:white}table{border-collapse:collapse;width:100%;font-size:.92rem}caption{text-align:left;padding:14px 16px;background:#e9f4f7;font-weight:700;color:var(--heading)}th,td{text-align:left;padding:13px 17px;border-bottom:1px solid var(--line);vertical-align:top}th{color:var(--heading);background:#f0f6fa;font-weight:700}tr:last-child td{border-bottom:0}.step-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:25px 0}.step-flow>div{padding:16px;background:#fff;border-top:3px solid var(--cyan)}.step-flow strong{display:block;color:var(--heading)}.comparison-wide{margin:38px 0}.fact-bullets{padding-left:20px}.fact-bullets li{margin-bottom:9px}.tactic-steps{counter-reset:tactics;margin:24px 0}.tactic-steps article{position:relative;padding:15px 16px 17px 70px;margin-bottom:15px;border-left:1px solid var(--line);background:white}.tactic-steps article:before{counter-increment:tactics;content:"0" counter(tactics);position:absolute;left:20px;top:14px;font-size:1.3rem;color:#0a91a1;font-weight:800}.project-matrix{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.project-matrix>article{padding:25px;background:white;border-bottom:3px solid var(--cyan)}.project-matrix>article:nth-child(2){background:var(--mint)}.project-matrix>article:nth-child(3){background:var(--soft)}.exhibit{display:grid;grid-template-columns:1fr 1fr;gap:38px;align-items:center;margin:40px 0}.exhibit:nth-of-type(even) .media-frame{order:2}.exhibit .media-frame{min-height:125px}.longform{max-width:780px;margin:40px auto}.rule-toc{max-width:780px;background:white;padding:22px 25px;border:1px solid var(--line);margin-bottom:40px}.rule-toc a{display:inline-block;margin:5px 22px 5px 0}.handbook-section{max-width:840px;margin:0 auto 55px}.handbook-section h2{padding-bottom:12px;border-bottom:2px solid var(--cyan)}.faq-list{max-width:900px}.faq-list details{background:white;border-bottom:1px solid var(--line);padding:0 21px}.faq-list summary{cursor:pointer;padding:16px 0;color:var(--heading);font-weight:700}.faq-list details p{padding:0 0 17px}.about-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:45px}.about-menu{background:#eaf1f6;padding:22px;align-self:start}.about-menu a{display:block;padding:7px 0}.service-section{margin-bottom:45px}.service-section h2{border-bottom:1px solid var(--line);padding-bottom:10px}.about-main{max-width:900px}.site-footer{background:#0B2539;color:#DCECF5;margin-top:65px;padding-top:52px}.footer-layout{display:grid;grid-template-columns:2.3fr 1fr 1fr;gap:50px}.footer-identity strong{font-size:1.12rem;color:#fff}.footer-identity strong span{font-size:.65rem;letter-spacing:.08em;color:#8fdce4;margin-left:8px}.footer-identity p{max-width:500px;margin:12px 0;color:#b6cbd7;font-size:.9rem}.footer-menu h2{font-size:1rem;color:#fff}.footer-menu a{display:block;color:#cee1eb;text-decoration:none;font-size:.89rem;padding:3px 0}.footer-menu a:hover{color:#fff}.footer-bottom{margin-top:38px;border-top:1px solid #345365;padding:18px 0;display:flex;justify-content:space-between;gap:16px;color:#a9c4d2;font-size:.8rem}.back-top{position:fixed;right:20px;bottom:20px;border:0;border-radius:50%;width:45px;height:45px;background:#163C57;color:white;cursor:pointer;box-shadow:0 6px 20px #17394b33}.back-top[hidden]{display:none}
@media(max-width:1024px){.container{width:min(100% - 44px,1200px)}.section-gap{margin-block:48px}.editorial-columns{gap:28px}.hero-editorial{gap:28px}}
@media(max-width:920px){.brand-inner{height:62px;justify-content:space-between;gap:8px}.brand-subtitle,.desktop-nav{display:none}.menu-toggle{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:40px;height:40px;padding:6px;background:transparent;border:0;cursor:pointer;flex:0 0 40px}.menu-toggle span{display:block;width:21px;height:2px;background:#17384f}.brand-logo{margin:auto}.brand-logo .media-frame img{max-height:30px}.brand-logo .wordmark strong{font-size:1rem}.register-link{margin:0;padding:5px 10px;font-size:.78rem;min-height:38px}.drawer-backdrop{display:block;position:fixed;inset:0;z-index:100;background:#0b1e31a6;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(86vw,340px);overflow-y:auto;z-index:101;background:#fff;padding:19px 23px;transform:translateX(-105%);visibility:hidden;transition:transform .22s,visibility .22s;box-shadow:9px 0 25px #0b253933}.drawer-open .drawer-backdrop{opacity:1;visibility:visible;pointer-events:auto}.drawer-open .mobile-drawer{transform:translateX(0);visibility:visible}.drawer-open{overflow:hidden}.drawer-heading{display:flex;align-items:center;justify-content:space-between;padding-bottom:17px;border-bottom:1px solid var(--line)}.drawer-heading strong{color:var(--heading)}.drawer-close{width:40px;height:40px;border:1px solid var(--line);border-radius:7px;background:white;color:var(--nav);font-size:1.6rem;line-height:1;cursor:pointer}.drawer-label{margin:22px 0 7px;color:var(--muted);font-size:.8rem;font-weight:700}.mobile-drawer>a{display:block;padding:11px 10px;border-radius:7px;color:var(--heading);text-decoration:none}.mobile-drawer>a.is-current{font-weight:800;background:var(--soft);border-left:3px solid var(--cyan)}.mobile-quick{display:flex;justify-content:space-around;flex-wrap:wrap;gap:8px;margin-top:40px;padding:15px 0;border-top:1px solid var(--line)}.mobile-quick a{font-size:.83rem;text-decoration:none}}
@media(max-width:760px){.hero-editorial,.feature-focus,.editorial-columns,.split-band,.split-band.reverse,.exhibit,.about-layout{grid-template-columns:1fr}.hero-editorial .media-frame{max-width:600px}.split-band.reverse .media-frame,.exhibit:nth-of-type(even) .media-frame{order:initial}.topic-list{gap:0 20px}.rule-tiles{grid-template-columns:1fr}.rule-tiles article:nth-child(n){transform:none}.step-flow,.reading-road{grid-template-columns:repeat(2,minmax(0,1fr))}.project-matrix{grid-template-columns:1fr}.about-menu{order:2}.related-links{grid-template-columns:1fr}.footer-layout{grid-template-columns:1fr 1fr}.footer-identity{grid-column:1/-1}.footer-bottom{flex-direction:column;gap:3px}.intro-band{padding:20px}.hero-editorial{padding-top:10px}}
@media(max-width:640px){.container{width:calc(100% - 32px)}body{font-size:15px}.page-main{padding-top:20px}.breadcrumb{margin-bottom:21px}.section-gap{margin-block:36px}h1{font-size:clamp(1.7rem,7vw,2rem)}h2{font-size:1.36rem}h3{font-size:1.09rem}.hero-editorial h1{font-size:clamp(1.72rem,7vw,2rem)}.lead{font-size:1rem}.topic-list{grid-template-columns:1fr}.topic-item{padding:15px 0}.focus-main{padding:20px}.focus-side article{padding:18px}.visual-band{padding:19px}.media-frame--hero{--media-limit:205px}.media-frame--feature{--media-limit:185px}.media-frame--card{--media-limit:145px}.media-frame--wide{--media-limit:135px}.media-frame--mobile{--media-limit:285px;max-width:250px}.media-frame--logo{--media-limit:30px}.hero-editorial .media-frame.media-missing{min-height:130px}.step-flow{grid-template-columns:1fr 1fr}.step-flow>div{padding:12px}.footer-layout{gap:25px}.site-footer{padding-top:36px;margin-top:40px}th,td{padding:10px 12px}.table-scroll table{min-width:560px}.related-reading{margin-top:43px}.brand-logo .media-frame img{max-width:145px}}
@media(max-width:380px){.brand-logo .wordmark strong{font-size:.9rem}.register-link{padding:5px 7px}.reading-road{grid-template-columns:1fr}.footer-layout{grid-template-columns:1fr}.footer-identity{grid-column:auto}}
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