/* The square geometry applies to every element, including all media ancestors. */
:root{--ink:#2b4145;--teal:#245a63;--aqua:#6eaaa6;--gold:#c4a777;--paper:#f7f5ef;--pale:#e6ece9;--line:#d7dfdc;--muted:#657878;--hero-radius:0;--image-radius:0;--media-radius:0;--article-cover-radius:0;--card-media-radius:0}
*{box-sizing:border-box;border-radius:0!important}
html{scroll-behavior:smooth;scroll-padding-top:32px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased}
img,picture,figure{display:block;max-width:100%;margin:0;border-radius:0!important}
img{height:auto}
a{color:inherit;text-decoration:none;text-underline-offset:5px}
button,input,select{font:inherit;color:inherit}
a,button,summary,select{-webkit-tap-highlight-color:transparent}
a:hover{color:var(--teal)}
a:focus-visible,button:focus-visible,summary:focus-visible,select:focus-visible{outline:3px solid #c4a777;outline-offset:5px}
button,summary,select{cursor:pointer}
button{border:0}
h1,h2,h3,p,ol,ul,dl{margin-top:0}
h1,h2,h3{font-weight:600;line-height:1.45;letter-spacing:-.035em}
h1{font-size:clamp(34px,3.6vw,54px)}
h2{font-size:clamp(28px,2.5vw,38px);margin-bottom:22px}
h3{font-size:21px;margin-bottom:14px}
p{margin-bottom:20px}
code,pre{font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace}
code{font-size:.91em;overflow-wrap:anywhere}
::selection{background:#d0dfd8;color:#193f46}
.wrap{width:min(1280px,calc(100% - 112px));margin-inline:auto}
.section{padding-block:94px}
.skip-link{position:fixed;top:-90px;left:20px;background:var(--teal);color:white;padding:10px 20px;z-index:100}
.skip-link:focus{top:10px;color:white}
.site-header{background:var(--paper);position:relative;z-index:20;border-bottom:1px solid var(--line)}
.header-inner{max-width:1440px;margin:auto;padding:19px 40px;min-height:88px;display:flex;align-items:center;gap:30px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand img{width:46px;height:46px;object-fit:contain}
.brand>span{font-size:26px;font-weight:650;letter-spacing:-.8px;line-height:1.15}
.brand small{display:block;font-size:10px;letter-spacing:1.6px;font-weight:400;margin-top:7px}
.primary-nav{margin-left:auto;display:flex;gap:27px;align-items:center;white-space:nowrap;font-size:14px}
.primary-nav a{position:relative;padding-block:10px}
.primary-nav a[aria-current=page]:after{content:"";height:2px;background:var(--teal);position:absolute;bottom:1px;left:0;right:0}
.header-download{display:flex;align-items:center;gap:24px;padding:10px 17px;border:1px solid var(--teal);font-size:13px;white-space:nowrap}
.header-download:hover{background:var(--teal);color:#fff}
.menu-toggle{display:none;background:transparent;padding:10px 0;font-size:14px}
.delta-hero-bolm-govcn{position:relative;color:white;background:#234750;min-height:650px}
.hero-media{position:absolute;inset:0}
.hero-image{width:100%;height:100%;object-fit:cover;object-position:center}
.hero-media:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(13,42,47,.84) 0%,rgba(18,46,48,.60) 37%,rgba(12,39,42,.13) 75%,rgba(11,38,42,.1) 100%)}
.hero-content{position:relative;padding-top:65px;padding-bottom:28px}
.hero-kicker{font-size:13px;letter-spacing:2px;color:#e0e9e2;display:flex;gap:22px;align-items:center;margin-bottom:25px}
.hero-kicker>span{font-size:10px;letter-spacing:1.8px;color:#c8d5ce;border-left:1px solid #aabbb4;padding-left:22px}
.hero-content h1{font-size:clamp(37px,3.7vw,55px);line-height:1.45;letter-spacing:.015em;margin:0 0 24px;max-width:760px;text-wrap:balance}
.hero-description{color:#e0e7e2;font-size:16px;line-height:1.95;margin-bottom:29px}
.hero-actions{display:flex;align-items:center;gap:28px;flex-wrap:wrap}
.button{display:inline-flex;justify-content:center;align-items:center;gap:35px;background:var(--teal);color:white;font-weight:500;font-size:14px;padding:15px 25px;min-height:54px;border:1px solid var(--teal)}
.button:hover{background:#173f47;color:white}
.hero-actions .button{background:var(--paper);border-color:var(--paper);color:var(--teal)}
.hero-actions .button:hover{background:#e2e8e2}
.hero-secondary{color:#fff;font-size:14px;border-bottom:1px solid #a9bab3;padding-bottom:5px;display:flex;gap:24px}
.hero-secondary:hover{color:#fff;border-color:#fff}
.hero-caption{border-top:1px solid rgba(229,238,230,.4);margin-top:58px;padding-top:19px;font-size:11px;letter-spacing:2px;display:flex;justify-content:space-between;color:#e1e8e1}
.topic-strip{border-bottom:1px solid var(--line);background:#eeeee5}
.topic-strip>.wrap{display:flex;justify-content:space-between;align-items:center;gap:15px;min-height:70px;font-size:13px}
.topic-strip>.wrap>span{color:var(--muted);font-size:11px;letter-spacing:1px}
.topic-strip a{padding-block:15px}
.eyebrow{font-size:11px;letter-spacing:2px;font-weight:500;color:var(--muted);margin-bottom:18px;display:flex;gap:16px;align-items:center}
.eyebrow>span{font-family:Consolas,monospace;color:#9b7c4b;letter-spacing:1px;border-right:1px solid var(--gold);padding-right:16px}
.section-heading>p:not(.eyebrow){max-width:620px;font-size:15px;color:var(--muted)}
.section-heading h2{margin-bottom:18px}
.import-flow{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));list-style:none;padding:0;margin:46px 0 0;gap:26px}
.import-flow li{border-top:1px solid #a1b4ae;padding-top:22px;position:relative}
.flow-number{font-family:Georgia,serif;font-size:31px;color:#a28760;display:block;margin-bottom:18px}
.import-flow h3{font-size:20px}
.import-flow p{font-size:14px;color:var(--muted);min-height:75px}
.text-link{display:inline-flex;align-items:center;justify-content:space-between;gap:20px;color:var(--teal);font-size:14px;font-weight:500;border-bottom:1px solid #98b2ac;padding-bottom:4px;line-height:1.7}
.text-link:hover{border-color:var(--teal)}
.format-editorial{background:#e9eeea}
.split-heading{display:grid;grid-template-columns:1.4fr 1fr;gap:90px;align-items:end;margin-bottom:36px}
.split-heading>p{font-size:15px;max-width:420px;margin-left:auto;color:var(--muted)}
.format-table{border-top:1px solid #7f9990;border-bottom:1px solid #7f9990}
table{border-collapse:collapse;width:100%;text-align:left;font-size:14px}
th,td{padding:23px 20px;border-bottom:1px solid #c8d3cc;vertical-align:top}
th:first-child,td:first-child{padding-left:0}
th:last-child,td:last-child{padding-right:0}
thead th{font-size:11px;color:var(--muted);font-weight:500;letter-spacing:1px;padding-top:17px;padding-bottom:17px}
tbody th{font-weight:600;font-size:17px}
tbody tr:last-child th,tbody tr:last-child td{border-bottom:0}
td a{text-decoration:underline;text-decoration-color:#a1b7ae}
.format-foot{display:flex;justify-content:space-between;align-items:center;gap:28px;margin-top:23px}
.format-foot p{font-size:12px;color:var(--muted);margin:0;max-width:770px}
.format-foot .text-link{white-space:nowrap}
.photo-editorial{display:grid;grid-template-columns:1fr 1fr;gap:85px;align-items:center}
.photo-editorial figure img{width:100%;aspect-ratio:1.05;object-fit:cover}
figcaption{font-size:11px;color:var(--muted);margin-top:11px;line-height:1.8}
.photo-editorial>div>p{font-size:14px;color:var(--muted)}
.definition-list{margin:26px 0;border-top:1px solid var(--line)}
.definition-list>div{display:grid;grid-template-columns:135px 1fr;padding:13px 0;border-bottom:1px solid var(--line);font-size:14px;gap:15px}
.definition-list dt{font-weight:600}
dd{margin-left:0}
.pale{background:var(--pale)}
.group-layout{display:grid;grid-template-columns:1fr 1fr;gap:90px}
.group-photo{padding-top:35px}
.group-photo img{aspect-ratio:1.3;object-fit:cover;width:100%}
.relation-diagram{display:grid;gap:0;margin:30px 0;max-width:410px}
.relation-diagram>div{border:1px solid #a8bdb4;background:#f4f4ec;padding:13px 20px;display:flex;align-items:center;gap:25px;justify-content:space-between}
.relation-diagram small{font-size:11px;color:var(--muted)}
.relation-diagram strong{font-size:14px;font-weight:500}
.relation-diagram>span{line-height:25px;padding-left:45px;color:#82988c}
.margin-note{border-left:2px solid var(--gold);padding:10px 0 5px 23px;margin-top:27px;max-width:400px}
.margin-note>span{font-size:10px;letter-spacing:2px;color:var(--muted)}
.margin-note p{font-size:14px;margin:9px 0;color:var(--ink)}
.code-editorial{padding:84px 0 32px;background:#234c53;color:#ecf0e8}
.code-columns{display:grid;grid-template-columns:1fr 1fr;gap:70px}
.code-columns .eyebrow{color:#b9cec5}
.code-columns .eyebrow>span{color:#dbbd86}
.code-columns h2{font-size:29px}
.code-columns p{font-size:14px;color:#c7d8d0}
.code-panel{background:#193c44;color:#d3e2d7;border:1px solid #496970;margin:26px 0}
.code-label{display:flex;justify-content:space-between;gap:15px;padding:11px 18px;border-bottom:1px solid #496970;color:#d5e0d5;font-size:11px;letter-spacing:1px;flex-wrap:wrap}
.code-label>span{color:#9eb9b0;font-size:10px}
pre{margin:0;padding:24px;font-size:13px;line-height:1.9;white-space:pre;overflow:auto;tab-size:2;max-width:100%}
pre code{font-size:inherit;overflow-wrap:normal}
.code-columns .text-link{color:#e3d1a4;border-color:#92afa1}
.code-caveat{border-top:1px solid #496970;padding-top:25px;font-size:11px;color:#bdcfc7;margin-top:45px;margin-bottom:0}
.rule-demo{display:grid;grid-template-columns:1fr 1.7fr;gap:45px;border-block:1px solid #9db2aa;padding:34px 0}
.rule-demo label{display:block;font-size:12px;margin-bottom:10px;color:var(--muted)}
.rule-demo select{width:100%;max-width:320px;background:var(--paper);padding:12px;border:1px solid #9db2aa;font-family:Consolas,monospace;font-size:14px}
.rule-demo p{font-size:11px;color:var(--muted);margin-top:9px}
#rule-result{display:block;color:var(--teal);font-weight:500;font-size:16px}
#rule-list{list-style:none;padding:0;margin:10px 0;display:grid;gap:5px;align-self:start}
#rule-list li{display:grid;grid-template-columns:30px 1fr auto;padding:14px 16px;gap:18px;align-items:center;border-bottom:1px solid var(--line);font-size:12px;line-height:1.7}
#rule-list li>span{color:#8b9d96;font-family:Consolas,monospace}
#rule-list li strong{font-weight:500;font-size:11px}
#rule-list .matched{background:#dde8df;border-color:#9db9ad;color:var(--teal)}
.update-section{background:#e9e5d9}
.update-layout{display:grid;grid-template-columns:1fr 1fr;gap:100px}
.update-layout .section-heading>p{max-width:450px}
.update-notes{border-top:1px solid #afa88d}
.update-notes>div{display:grid;grid-template-columns:110px 1fr;padding:23px 0;border-bottom:1px solid #c9c2ac;gap:0 22px}
.update-notes span{font-size:10px;letter-spacing:1px;color:#7f7458;grid-row:span 2}
.update-notes h3{font-size:19px;margin:0 0 8px}
.update-notes p{font-size:13px;color:var(--muted);margin-bottom:0}
.article-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px 30px}
.article-card{border-bottom:1px solid #b8c8bf;padding-bottom:22px;min-width:0}
.cover-link{display:block;background:var(--pale)}
.cover-link img{width:100%;aspect-ratio:1.6;object-fit:cover;transition:filter .2s}
.cover-link:hover img{filter:brightness(.92)}
.article-card-body{padding-top:19px}
.card-meta{font-size:10px;letter-spacing:1.1px;color:#877c61;margin-bottom:11px}
.article-card h3{font-size:21px;margin-bottom:12px;line-height:1.6}
.article-card-body>p:not(.card-meta){font-size:13px;color:var(--muted);line-height:1.9;margin-bottom:20px}
.article-card .text-link{font-size:12px;border:0;padding:0;display:flex}
.faq-section{display:grid;grid-template-columns:1fr 1.7fr;gap:90px;border-top:1px solid var(--line)}
.faq-section>div>p:not(.eyebrow){font-size:14px;color:var(--muted)}
.faq-list{border-top:1px solid #9cb0a7}
details{border-bottom:1px solid #bdccc3}
summary{list-style:none;padding:22px 0;display:flex;gap:30px;align-items:center;justify-content:space-between;font-size:15px;font-weight:500;line-height:1.8}
summary::-webkit-details-marker{display:none}
summary>span{font-size:22px;font-weight:300;color:#839c8f;flex-shrink:0}
details[open] summary>span{transform:rotate(45deg)}
.faq-answer{font-size:14px;color:var(--muted);padding:0 30px 15px 0}
.faq-answer a{text-decoration:underline;color:var(--teal)}
.site-footer{background:#203e44;color:#cbd9d0;padding:48px 0 25px;font-size:12px}
.footer-top{display:flex;justify-content:space-between;align-items:center;gap:35px;padding-bottom:37px}
.site-footer .brand{color:#eef0e5}
.site-footer .brand small{font-size:10px;letter-spacing:1px;color:#b3c8bd}
.site-footer .brand img{width:44px;height:44px}
.footer-navigation{display:flex;gap:20px;flex-wrap:wrap;justify-content:flex-end;font-size:12px}
.site-footer a:hover{color:#fff}
.friend-links{display:flex;gap:22px;flex-wrap:wrap;padding:17px 0;border-top:1px solid #486269;align-items:center;font-size:12px}
.friend-links>span{font-size:10px;color:#a2b5ac;letter-spacing:1px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:20px;border-top:1px solid #486269;padding-top:22px;font-size:10px;line-height:1.9;color:#b8cbc0;flex-wrap:wrap}
.footer-bottom p{margin:0}
.filing-records{display:flex;gap:25px;flex-wrap:wrap}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:11px;color:var(--muted);padding-top:28px}
.breadcrumb>span[aria-hidden]{color:#adb8af}
.page-heading{padding-top:40px;padding-bottom:40px}
.page-heading h1{max-width:1000px;font-size:clamp(32px,3.2vw,47px);margin-bottom:22px;line-height:1.55;letter-spacing:-.02em}
.page-heading>p:not(.eyebrow){max-width:830px;font-size:16px;color:var(--muted);line-height:2;margin-bottom:0}
.landing-layout,.article-layout{display:grid;grid-template-columns:minmax(0,880px) minmax(210px,1fr);gap:65px;align-items:start}
.landing-cover,.article-cover{margin-bottom:44px}
.landing-cover img,.article-cover img{width:100%;height:auto;object-fit:cover}
.prose{font-size:16px;line-height:2.05;min-width:0}
.prose h2{font-size:27px;padding-top:10px;margin-bottom:19px;letter-spacing:-.01em;line-height:1.6}
.prose h3{font-size:20px}
.prose section{margin-bottom:43px;scroll-margin-top:25px}
.prose p{margin-bottom:20px}
.prose a{color:var(--teal);text-decoration:underline;text-decoration-color:#9ab0a5}
.prose li{margin-bottom:12px;padding-left:5px}
.prose ol,.prose ul{padding-left:26px}
.prose dt{font-weight:600;margin-top:15px}
.prose dd{color:var(--muted);margin-bottom:20px}
.prose .code-panel{line-height:1.8}
.prose table{font-size:14px}
.table-scroll{overflow:auto}
.guide-sidebar{position:sticky;top:30px;padding-top:0}
.sidebar-label{font-size:11px;letter-spacing:1px;padding:17px 0;border-top:2px solid var(--teal);margin:0}
.guide-sidebar nav{border-bottom:1px solid var(--line)}
.guide-sidebar nav a{padding:11px 0;display:flex;gap:15px;align-items:start;line-height:1.9;font-size:12px;border-top:1px solid var(--line)}
.guide-sidebar nav a>span{font-family:Consolas,monospace;font-size:10px;color:#9b825c}
.sidebar-note{margin-top:35px;padding:22px 20px;background:#e9ede5;font-size:12px;color:var(--muted)}
.sidebar-note strong{font-size:13px;color:var(--teal)}
.sidebar-note p{margin:10px 0;line-height:2}
.sidebar-note>span{font-size:10px;letter-spacing:1px}
.sidebar-note .text-link{font-size:11px;margin-top:10px}
.source-notes{padding:26px 28px;background:#e9ede6;border-left:2px solid #a68b5f;margin:35px 0;font-size:13px;line-height:1.95}
.source-notes h2{font-size:17px;margin-bottom:11px;padding:0}
.source-notes p{font-size:12px;color:var(--muted);margin-bottom:13px}
.source-notes ul{margin-bottom:0;padding-left:20px}
.source-notes li{margin-bottom:7px;padding-left:0}
.source-notes a{color:var(--teal);text-decoration:underline}
.related-section{border-top:1px solid var(--line);margin-top:55px;padding-top:60px}
.related-grid .article-card h3{font-size:19px}
.article-heading h1{max-width:1080px;font-size:clamp(30px,3.2vw,46px)}
.article-heading>p:not(.eyebrow){max-width:900px}
.article-meta{display:flex;gap:27px;flex-wrap:wrap;margin-top:25px;font-size:10px;color:#7b8a80;letter-spacing:1px}
.article-pagination{border-top:1px solid #a6bcb0;display:grid;grid-template-columns:1fr 1fr;margin-top:40px;gap:25px;padding-top:25px}
.article-pagination a{display:flex;flex-direction:column;gap:8px}
.article-pagination a:last-child{text-align:right;align-items:flex-end}
.article-pagination small,.pagination-edge{font-size:11px;color:var(--muted)}
.article-pagination strong{font-size:15px;font-weight:500;line-height:1.8}
.download-page{min-height:100vh;display:grid;place-items:center;background:var(--paper)}
.download-panel{width:min(440px,calc(100% - 48px));text-align:center;padding:45px 25px}
.download-panel>img{width:80px;height:80px;margin:0 auto 30px}
.download-panel h1{font-size:27px;margin:0 0 15px}
#countdown{font-size:60px;font-family:Georgia,serif;line-height:1.5;color:var(--teal);display:block}
#download-progress{appearance:none;display:block;width:100%;height:3px;border:0;margin:25px 0 33px;background:#d9e1d9}
#download-progress::-webkit-progress-bar{background:#d9e1d9}
#download-progress::-webkit-progress-value{background:var(--teal)}
#download-progress::-moz-progress-bar{background:var(--teal)}
.download-panel>.button{width:100%;font-size:14px}
@media(min-width:1600px){.delta-hero-bolm-govcn{min-height:720px}.hero-content{padding-top:90px}.hero-caption{margin-top:75px}}
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