:root{--bg:#F4F7FA;--white:#fff;--mist:#EAF1F6;--aqua:#E9F8F8;--navy:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--head:#18364B;--body:#344C60;--muted:#64798A;--line:#DCE6ED;--footer:#0B2539}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:var(--bg);font:16px/1.8 Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--body);overflow-wrap:break-word}button,input{font:inherit}a{color:#176cad;text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}h1,h2,h3{color:var(--head);line-height:1.4;letter-spacing:.012em}h1{font-size:clamp(2rem,3vw,2.35rem);margin:10px 0 20px}h2{font-size:1.65rem;margin:0 0 18px}h3{font-size:1.2rem;margin:0 0 12px}p{margin:0 0 16px}ul,ol{padding-left:1.5em}li{margin-bottom:8px}.shell{width:min(1200px,calc(100% - 56px));margin-inline:auto}.site-main{padding-bottom:62px}.site-header{background:#fff;position:relative;z-index:20}.brand-strip{min-height:72px;display:flex;align-items:center;gap:18px}.brand{display:flex;align-items:center;gap:8px;flex-shrink:0;font-weight:800;color:var(--navy)}.brand .media-frame{margin:0;padding:0;background:transparent;border:0;max-width:190px}.brand .media-frame img{max-height:38px}.brand-fallback{font-size:16px}.brand:has(img) .brand-fallback{display:none}.brand-desc{font-size:13px;color:var(--muted);margin:0}.register-link{margin-left:auto;display:inline-flex;justify-content:center;align-items:center;min-height:40px;padding:6px 18px;border-radius:9px;background:var(--navy);color:#fff;font-size:14px;font-weight:bold;white-space:nowrap}.register-link:hover{background:var(--deep);color:#fff;text-decoration:none}.desktop-nav{background:var(--navy)}.nav-row{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));min-height:52px}.nav-row a{color:#eaf5fa;display:flex;align-items:center;justify-content:center;text-align:center;position:relative;padding:8px 4px;font-size:15px;white-space:nowrap}.nav-row a:hover,.nav-row a[aria-current="page"]{color:#fff;font-weight:700;text-decoration:none}.nav-row a[aria-current="page"]:after{content:"";position:absolute;bottom:4px;width:22px;height:3px;background:var(--teal);border-radius:4px}.menu-toggle,.mobile-drawer,.menu-backdrop,.mobile-quick,.nojs-nav{display:none}.skip-link{position:absolute;top:-100px;left:12px;z-index:99;background:#fff;padding:8px}.skip-link:focus{top:10px}.breadcrumbs{font-size:13px;color:var(--muted);margin:22px 0 12px;display:flex;gap:10px}.eyebrow{text-transform:uppercase;letter-spacing:.11em;color:#087c88;font-weight:700;font-size:12px;margin-bottom:8px}.page-intro{padding:30px 34px 34px;background:#fff;border-bottom:3px solid #D4EBEE;margin:0 0 38px}.page-intro .lead{max-width:850px;margin:0;color:#435d6e}.home-hero{padding:44px 0 34px;display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);gap:32px;align-items:center}.home-hero h1{font-size:clamp(30px,3.3vw,42px)}.home-hero .lead{font-size:17px}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:25px}.button{display:inline-flex;background:var(--navy);color:#fff;border-radius:9px;padding:9px 18px;font-size:15px;font-weight:700;min-height:42px;align-items:center}.button--secondary{background:var(--teal);color:#092a37}.button:hover{filter:brightness(.94);color:#fff;text-decoration:none}.media-frame{display:flex;justify-content:center;align-items:center;min-width:0;width:100%;padding:8px;background:var(--mist);border-radius:14px;margin:0;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--logo{--media-limit:38px}.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;margin:auto}.media-frame--banner{--media-limit:210px}.media-missing{min-height:110px;border:1px solid var(--line);font-size:13px;color:#678290;text-align:center}.media-frame--logo.media-missing{min-height:36px;min-width:140px}.media-frame--hero.media-missing{min-height:195px}.section{margin:54px 0}.section-head{display:flex;justify-content:space-between;align-items:baseline;gap:20px;margin-bottom:20px;border-bottom:1px solid var(--line);padding-bottom:14px}.section-head h2{margin:0}.kicker{font-size:13px;color:var(--muted)}.topic-directory{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 34px;background:#fff;padding:12px 30px;border-radius:13px}.topic-item{padding:19px 0;border-bottom:1px solid var(--line)}.topic-item h3{font-size:18px;margin:0 0 6px}.topic-item p{font-size:15px;margin:0 0 7px}.editorial-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(230px,1fr);gap:28px}.feature-panel,.mini-panel,.surface,.quote-panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:25px}.feature-panel{border-top:4px solid var(--teal)}.mini-stack{display:grid;gap:16px}.mini-panel h3{font-size:18px}.split-feature{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);align-items:center;gap:36px}.split-feature.reverse{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr)}.split-feature.reverse>figure{order:2}.split-feature.reverse>div{order:1}.dark-band{background:var(--deep);border-radius:14px;padding:28px;color:#e3f0f6}.dark-band h2,.dark-band h3{color:#fff}.dark-band a{color:#a9edf0}.knowledge-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:start}.knowledge-row>article{background:#fff;padding:24px;border-left:3px solid var(--teal);border-radius:4px 12px 12px 4px}.knowledge-row>article:nth-child(2){margin-top:25px}.knowledge-row>article:nth-child(3){margin-top:48px}.steps{counter-reset:item;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;list-style:none;padding:0}.steps>li{counter-increment:item;background:var(--mist);padding:22px;border-top:3px solid var(--blue);border-radius:8px}.steps>li:before{content:counter(item,decimal-leading-zero);display:block;font-weight:800;font-size:26px;line-height:1;color:#0e7887;margin-bottom:14px}.steps strong{display:block;color:var(--head)}.notice{background:var(--aqua);border-left:4px solid var(--teal);padding:19px 23px;margin:24px 0}.prose{max-width:795px}.prose p{line-height:1.82}.content-columns{display:grid;grid-template-columns:minmax(0,2.3fr) minmax(210px,.8fr);gap:34px}.side-index{align-self:start;background:var(--mist);padding:23px;border-radius:12px}.side-index a{display:block;margin:9px 0}.chapter{margin:0 0 48px}.chapter h2{border-bottom:1px solid var(--line);padding-bottom:9px}.anchor-nav{display:flex;flex-wrap:wrap;gap:10px;background:#fff;padding:14px 17px;border-radius:10px;margin:20px 0 38px}.anchor-nav a{padding:6px 13px;border:1px solid var(--line);border-radius:8px}.table-scroll{max-width:100%;overflow-x:auto;margin:16px 0 27px}table{border-collapse:collapse;width:100%;min-width:560px;background:#fff;font-size:15px}caption{text-align:left;font-weight:700;padding:10px 0;color:var(--head)}th,td{padding:14px 15px;border:1px solid var(--line);text-align:left;vertical-align:top}th{background:var(--mist);color:var(--head)}.numbered-vertical{counter-reset:chapter;list-style:none;padding:0;border-left:2px solid #cbe5e7;margin:20px 0 30px}.numbered-vertical li{counter-increment:chapter;padding:3px 0 24px 23px;position:relative;margin:0}.numbered-vertical li:before{content:counter(chapter);position:absolute;left:-15px;top:1px;width:28px;height:28px;background:var(--navy);color:#fff;border-radius:50%;display:grid;place-items:center;font-size:13px}.matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.matrix article{padding:24px;background:#fff;border:1px solid var(--line);border-top:4px solid var(--teal);border-radius:10px}.gallery-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:26px;align-items:start}.gallery-grid article{min-width:0}.gallery-grid article:nth-child(2){margin-top:46px}.gallery-grid .media-frame{margin-bottom:20px}.faq-stack{display:grid;gap:10px}.faq-stack details{background:#fff;border:1px solid var(--line);border-radius:9px}.faq-stack summary{cursor:pointer;padding:14px 20px;font-weight:700;color:var(--head)}.faq-stack details[open] summary{border-bottom:1px solid var(--line)}.faq-answer{padding:14px 20px}.faq-answer p{margin:0}.related-links{display:flex;flex-wrap:wrap;gap:10px 20px;padding:20px 0}.text-link{font-weight:700}.text-link:after{content:' ›';color:var(--teal)}.service-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:34px}.service-index{align-self:start;background:var(--mist);padding:20px;border-radius:10px}.service-index a{display:block;padding:5px}.service-main>section{margin:0 0 44px}.site-footer{background:var(--footer);color:#dcecf5;padding:42px 0 20px}.footer-layout{display:grid;grid-template-columns:2fr 1fr;gap:45px}.footer-brand{font-size:20px;font-weight:800;color:#fff}.footer-note{font-size:14px;max-width:700px}.site-footer nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px 22px;align-content:start}.site-footer a{color:#dcecf5;font-size:14px}.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid #38556c;margin-top:24px;padding-top:15px;font-size:13px;color:#bed1dd}#back-to-top{position:fixed;right:18px;bottom:18px;border:0;background:var(--navy);color:#fff;border-radius:50%;width:42px;height:42px;cursor:pointer;opacity:.85}#back-to-top:hover{opacity:1}
@media(max-width:1200px){.shell{width:calc(100% - 44px)}.section{margin:46px 0}}@media(max-width:920px){.brand-strip{min-height:62px;display:grid;grid-template-columns:42px minmax(0,1fr) auto;gap:10px}.brand{justify-self:center;min-width:0}.brand .media-frame img{max-height:30px}.brand .media-frame--logo{--media-limit:30px}.brand-desc,.desktop-nav{display:none}.register-link{margin:0;min-height:38px;padding:5px 12px;font-size:13px}.menu-toggle{display:flex;flex-direction:column;align-items:center;justify-content:center;width:40px;height:40px;gap:5px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}.menu-toggle span{display:block;width:19px;height:2px;background:var(--navy)}.menu-backdrop{display:block;position:fixed;inset:0;background:rgba(5,23,36,.6);z-index:60;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s,visibility .2s}.menu-backdrop.is-open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{display:block;position:fixed;z-index:61;top:0;bottom:0;left:0;width:min(86vw,340px);overflow-y:auto;background:#fff;transform:translateX(-101%);visibility:hidden;transition:transform .22s,visibility .22s;padding:18px 22px}.mobile-drawer.is-open{transform:translateX(0);visibility:visible}.drawer-top{display:flex;justify-content:space-between;align-items:center;padding-bottom:14px;border-bottom:1px solid var(--line)}.drawer-top button{font-size:27px;line-height:1;background:var(--mist);border:0;width:40px;height:40px;border-radius:8px}.drawer-label{font-size:12px;text-transform:uppercase;color:var(--muted);letter-spacing:.1em;margin:22px 0 5px}.mobile-drawer nav a{display:block;padding:10px;border-radius:8px;color:var(--head)}.mobile-drawer nav a[aria-current=page]{background:var(--aqua);font-weight:bold;border-left:3px solid var(--teal)}body.drawer-open{overflow:hidden}.mobile-quick{display:flex;gap:15px;flex-wrap:wrap;padding:16px 0;margin-bottom:16px;border-top:1px solid var(--line);font-size:14px}.nojs-nav{display:flex;gap:12px;flex-wrap:wrap;padding-block:10px;font-size:13px}.page-intro{padding:25px}.home-hero{gap:20px}}
@media(max-width:760px){.home-hero,.editorial-grid,.split-feature,.split-feature.reverse,.content-columns,.service-layout,.gallery-grid{grid-template-columns:1fr}.home-hero>figure{order:2}.split-feature.reverse>figure,.split-feature.reverse>div{order:initial}.knowledge-row,.matrix{grid-template-columns:1fr 1fr}.steps{grid-template-columns:1fr 1fr}.gallery-grid article:nth-child(2),.knowledge-row>article:nth-child(2),.knowledge-row>article:nth-child(3){margin-top:0}.service-main{order:1}.service-index{order:2}.footer-layout{grid-template-columns:1fr;gap:20px}.side-index{order:-1}.section{margin:38px 0}}
@media(max-width:640px){body{font-size:15px;line-height:1.77}.shell{width:calc(100% - 32px)}h1{font-size:clamp(25px,7vw,29px)}h2{font-size:21px}h3{font-size:18px}.home-hero{padding:27px 0}.home-hero h1{font-size:clamp(27px,7.5vw,32px)}.home-hero .lead{font-size:15px}.page-intro{padding:20px 17px 24px;margin-bottom:28px}.section{margin:34px 0}.section-head{display:block}.topic-directory,.knowledge-row,.matrix,.steps{grid-template-columns:1fr}.topic-directory{padding:4px 18px}.feature-panel,.mini-panel,.surface,.quote-panel{padding:18px}.gallery-grid{gap:18px}.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}.media-frame--logo{--media-limit:30px}.brand .media-frame{max-width:150px}.brand-fallback{font-size:15px}.media-missing.media-frame--hero{min-height:140px}.footer-layout{gap:18px}.site-footer nav{grid-template-columns:1fr 1fr}.footer-bottom{gap:16px}.section-head h2{margin-bottom:8px}}
@media(max-width:380px){.brand-strip{grid-template-columns:40px minmax(0,1fr) 76px;gap:5px}.register-link{padding:5px 6px}.brand .media-frame{max-width:132px}.footer-layout nav{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
