:root{--bg:#F4F7FA;--surface:#fff;--soft:#EAF1F6;--aqua:#E9F8F8;--nav:#102E46;--deep:#163C57;--teal:#13B8C5;--blue:#237BD3;--head:#18364B;--text:#344C60;--muted:#64798A;--border:#DCE6ED}*{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}a{color:#1765a7;text-underline-offset:3px}a:hover{color:#0b476e}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:3px}button{font:inherit;cursor:pointer}img{max-width:100%}.shell{width:min(100% - 56px,1200px);margin-inline:auto}.reading{max-width:800px}.site-header{background:white}.brand-bar{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand-left{display:flex;align-items:center;min-width:0;gap:15px}.brand-logo{display:inline-flex;align-items:center;gap:10px;color:var(--nav);text-decoration:none;min-width:0}.brand-wordmark{font-size:16px;letter-spacing:.09em;font-weight:800;white-space:nowrap}.brand-caption{font-size:13px;color:var(--muted);border-left:1px solid var(--border);padding-left:16px;white-space:nowrap}.register-link,.button{display:inline-flex;align-items:center;justify-content:center;border-radius:10px;background:var(--nav);color:white;text-decoration:none;font-weight:700;min-height:42px;padding:8px 19px;white-space:nowrap}.register-link:hover,.button:hover{background:var(--deep);color:white}.button.secondary{background:#dff4f5;color:#114c5d}.desktop-nav{background:var(--nav)}.nav-row{display:flex;justify-content:space-between;align-items:stretch;gap:5px}.nav-row a{position:relative;flex:1;text-align:center;white-space:nowrap;text-decoration:none;color:#e3edf4;font-weight:600;font-size:15px;line-height:50px}.nav-row a:hover{background:#234860;color:#fff}.nav-row a[aria-current]{color:#fff;font-weight:800}.nav-row a[aria-current]:after{position:absolute;content:"";bottom:5px;height:3px;left:28%;right:28%;background:var(--teal);border-radius:3px}.media-frame{--media-limit:220px;width:100%;min-width:0;max-width:100%;display:flex;align-items:center;justify-content:center;padding:8px;margin:0;border-radius:14px;background:var(--soft)}.media-frame img{display:block;width:auto;height:auto;max-width:100%;max-height:var(--media-limit);object-fit:contain;object-position:center}.media-frame--logo{--media-limit:38px;width:auto;max-width:150px;background:transparent;padding:0;border-radius:0}.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;margin-inline:auto}.media-missing{min-height:110px;color:#7b8d9d;border:1px dashed #c6d7e1;text-align:center;font-size:13px}.media-frame--logo.media-missing{min-height:32px;font-size:10px}.section{margin-block:58px}.section-sm{margin-block:36px}.eyebrow{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#0d7382;font-weight:800}.page-hero{padding:42px 0 20px;border-bottom:1px solid var(--border)}.page-hero p{max-width:850px}.breadcrumbs{font-size:13px;color:var(--muted);margin:16px 0}.breadcrumbs a{color:var(--muted)}h1,h2,h3{color:var(--head);line-height:1.38;letter-spacing:-.025em}h1{font-size:35px;margin:10px 0 18px}h2{font-size:27px;margin:0 0 20px}h3{font-size:20px;margin:8px 0 11px}p{margin:0 0 17px}ul,ol{padding-left:23px}.lead{font-size:18px;color:#466277;line-height:1.85}.grid-2,.grid-3{display:grid;gap:30px;min-width:0}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-2>*,.grid-3>*,.split>*,.editorial-grid>*{min-width:0}.split{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:42px;align-items:center}.split.reverse{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}.hero-home{display:grid;grid-template-columns:1.08fr 1fr;gap:44px;align-items:center;padding:46px 0 30px}.hero-home h1{font-size:42px}.hero-home p{max-width:610px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.overline{display:inline-block;font-size:13px;font-weight:800;color:#0c7985;letter-spacing:.1em}.directory{display:grid;grid-template-columns:1fr 1fr;column-gap:48px}.directory-item{padding:21px 0;border-top:1px solid var(--border)}.directory-item a{font-size:20px;font-weight:800;text-decoration:none;color:var(--head)}.directory-item p{margin:6px 0 0;font-size:15px}.editorial-grid{display:grid;grid-template-columns:2fr 1fr;gap:20px}.feature-story{background:var(--deep);color:#e9f5f8;padding:30px;border-radius:14px}.feature-story h3{color:white;font-size:24px}.feature-story a{color:#9beaf0}.stack-stories{display:grid;gap:16px}.story-note{border-top:3px solid var(--teal);background:white;padding:22px;border-radius:0 0 12px 12px}.story-note p{font-size:15px}.accent-panel{background:var(--aqua);padding:30px;border-radius:14px}.rule-note{border-left:3px solid var(--teal);padding:8px 20px;background:white}.rule-note:nth-child(2){transform:translateY(13px)}.rule-note:nth-child(3){transform:translateY(26px)}.steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;padding:0;list-style:none}.steps li{padding:19px;background:white;border-top:3px solid var(--teal);border-radius:4px 4px 12px 12px;min-width:0}.steps li:before{counter-increment:step;content:'0' counter(step);display:block;color:#078492;font-size:25px;font-weight:800}.steps li strong{display:block;color:var(--head)}.fine-print{border-top:1px solid var(--border);padding-top:18px;font-size:14px;color:var(--muted)}.toc{display:flex;gap:10px;flex-wrap:wrap;margin:22px 0}.toc a{border:1px solid #b5cbd8;border-radius:20px;padding:5px 15px;text-decoration:none;background:white;font-size:14px;font-weight:700}.article-panel{background:white;border:1px solid var(--border);border-radius:14px;padding:28px}.article-section{margin:42px 0}.fact-aside{padding:23px;background:var(--soft);border-radius:12px}.fact-aside h3{margin-top:0}.knowledge-layout{display:grid;grid-template-columns:minmax(0,2.2fr) minmax(230px,.85fr);gap:35px;align-items:start}.table-wrap{width:100%;overflow-x:auto;border:1px solid var(--border);border-radius:12px;background:white}table{width:100%;border-collapse:collapse;min-width:530px;font-size:15px}caption{text-align:left;font-weight:700;color:var(--head);padding:15px 18px}th,td{padding:13px 17px;text-align:left;border-top:1px solid var(--border);vertical-align:top}th{background:#e9f1f6;color:#173d50}tbody tr:nth-child(even){background:#f7fafc}.timeline{border-left:3px solid var(--teal);padding-left:24px;margin:20px 0}.timeline-item{position:relative;padding:0 0 24px}.timeline-item:before{content:"";position:absolute;left:-32px;top:9px;width:13px;height:13px;border-radius:50%;background:#0daab8;border:3px solid white}.timeline-item strong{display:block;font-size:18px;color:var(--head)}.callout{background:#eaf6f7;border-left:4px solid var(--teal);padding:22px 26px;border-radius:0 12px 12px 0}.topic-matrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.topic-matrix article{background:white;border:1px solid var(--border);padding:23px;border-radius:12px}.topic-matrix h3{margin-top:0}.gallery-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:start}.gallery-grid article:last-child{margin-top:60px}.label-block{font-weight:800;color:#00818d;font-size:13px;letter-spacing:.05em}.index-box{background:white;padding:22px;border:1px solid var(--border);border-radius:12px}.index-box a{display:block;padding:8px 0}.faq-list{border-top:1px solid var(--border)}details{background:white;border-bottom:1px solid var(--border);padding:0 18px}details summary{padding:17px 4px;font-weight:700;color:var(--head);cursor:pointer}details p{padding:0 4px 14px;font-size:15px}.service-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:40px}.service-nav{align-self:start;position:sticky;top:20px;background:var(--soft);padding:22px;border-radius:12px}.service-nav a{display:block;padding:7px 0}.service-content{min-width:0}.site-footer{background:#0B2539;color:#DCECF5;margin-top:70px;padding:45px 0 22px}.footer-layout{display:grid;grid-template-columns:2fr 1fr;gap:55px}.footer-layout p{max-width:680px;font-size:14px;color:#b9cedc}.footer-title{font-size:22px;font-weight:800;color:white;text-decoration:none}.footer-title small{font-size:12px;letter-spacing:.1em}.footer-layout nav{display:grid;grid-template-columns:repeat(2,1fr);gap:8px 14px;align-content:start}.site-footer a{color:#e1f4f9}.footer-bottom{font-size:12px;color:#a7c0d1;border-top:1px solid #315066;margin-top:30px;padding-top:18px}.mobile-quick{display:none}.menu-toggle,.mobile-drawer,.drawer-backdrop,.back-to-top{display:none}.skip-link{position:absolute;left:15px;top:-100px;background:white;color:black;padding:10px;z-index:100}.skip-link:focus{top:10px}.nojs-nav{display:flex;flex-wrap:wrap;gap:12px;padding:10px 0}.back-to-top{position:fixed;right:22px;bottom:22px;background:var(--deep);border:0;border-radius:100%;width:44px;height:44px;color:white;font-size:24px;z-index:10}.back-to-top.visible{display:block}@media(max-width:1100px){.shell{width:calc(100% - 44px)}.brand-caption{display:none}}@media(max-width:920px){.brand-bar{height:62px;min-height:62px}.desktop-nav{display:none}.brand-left{flex:1;justify-content:center}.brand-logo{position:relative;max-width:55%;justify-content:center}.brand-wordmark{font-size:13px}.media-frame--logo{--media-limit:30px;max-width:115px}.menu-toggle{display:flex;position:absolute;left:22px;top:11px;width:40px;height:40px;border:1px solid var(--border);border-radius:9px;background:white;flex-direction:column;align-items:center;justify-content:center;gap:5px;z-index:1}.menu-toggle span{display:block;height:2px;width:19px;background:var(--nav)}.register-link{height:40px;min-height:40px;font-size:13px;padding:6px 11px;z-index:1}.drawer-backdrop{display:block;position:fixed;inset:0;background:rgba(8,24,36,.57);opacity:0;visibility:hidden;pointer-events:none;z-index:50;transition:opacity .2s}.drawer-backdrop.is-open{opacity:1;visibility:visible;pointer-events:auto}.mobile-drawer{display:block;position:fixed;inset:0 auto 0 0;width:min(86vw,340px);background:white;z-index:51;transform:translateX(-105%);transition:transform .23s;overflow-y:auto;box-shadow:4px 0 15px #1232}.mobile-drawer.is-open{transform:translateX(0)}.drawer-open{overflow:hidden}.drawer-head{display:flex;justify-content:space-between;align-items:center;padding:17px 20px;border-bottom:1px solid var(--border)}.drawer-close{background:var(--soft);border:0;border-radius:8px;height:40px;width:40px;font-size:27px;color:var(--head)}.drawer-group{margin:18px 20px 3px;color:var(--muted);font-size:12px;font-weight:800}.mobile-drawer nav a{display:block;margin:0 12px;padding:10px 17px;text-decoration:none;color:var(--head);border-radius:8px}.mobile-drawer nav a[aria-current]{background:var(--aqua);font-weight:800;border-left:3px solid var(--teal)}.mobile-quick{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;padding:20px 0 0;font-size:13px}.site-footer{margin-top:48px}}@media(max-width:760px){.grid-2,.grid-3,.split,.split.reverse,.hero-home,.editorial-grid,.knowledge-layout,.topic-matrix,.gallery-grid,.service-layout,.footer-layout{grid-template-columns:minmax(0,1fr)}.hero-home{gap:22px;padding-top:26px}.gallery-grid article:last-child{margin-top:0}.directory{grid-template-columns:1fr}.steps{grid-template-columns:repeat(2,minmax(0,1fr))}.service-nav{position:static;order:2}.service-content{order:1}.section{margin-block:42px}.footer-layout{gap:20px}.hero-home .media-frame{max-width:570px;margin-inline:auto}}@media(max-width:640px){.shell{width:calc(100% - 32px)}body{font-size:15px;line-height:1.78}.brand-logo{max-width:50%}.brand-wordmark{display:none}.menu-toggle{left:16px}.hero-home h1{font-size:30px}.page-hero h1{font-size:27px}h2{font-size:22px}h3{font-size:18px}.lead{font-size:16px}.page-hero{padding-top:25px}.article-panel,.accent-panel,.feature-story{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}.steps{gap:9px}.steps li{padding:13px}.footer-layout nav{grid-template-columns:1fr 1fr}}@media(max-width:370px){.register-link{padding:5px 8px;font-size:12px}.hero-actions .button{width:100%}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}