@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:400;font-display:optional;src:url(/assets/fonts/source-sans-3-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:600;font-display:optional;src:url(/assets/fonts/source-sans-3-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:700;font-display:optional;src:url(/assets/fonts/source-sans-3-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:700;font-display:optional;src:url(/assets/fonts/source-serif-4-latin-700-normal.woff2) format("woff2")}

:root{
  --ink:#111827;--body:#1F2937;--text2:#374151;--muted:#4B5563;--rule:#E5E7EB;--rule2:#D1D5DB;--rule3:#9CA3AF;
  --blue:#0F4C81;--blue-dk:#0A3459;--orange:#B4531F;--tint:#F3F6FA;--paper:#FAFAF8;--util:#F5F5F2;
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;
  --sans:"Source Sans 3",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:16px}
body{margin:0;background:#fff;color:var(--body);font:400 1.125rem/1.7 var(--sans)}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{color:var(--blue-dk);text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;z-index:10;background:#fff;padding:8px 12px}

/* masthead */
.utility{background:var(--util);border-bottom:1px solid #E5E5E0;font-size:.875rem;color:var(--muted)}
.utility .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 24px;padding-top:8px;padding-bottom:8px}
.utility-links{display:flex;gap:20px}.utility a{color:var(--muted)}
.masthead-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:18px;padding-bottom:18px}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--ink)}
.brand>span{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font:700 1.5rem/1.1 var(--serif);letter-spacing:-.01em}
.brand-tag{font-size:.84rem;color:var(--muted);margin-top:4px}
.nav{border-top:1px solid var(--rule);border-bottom:1px solid var(--ink)}
.nav .wrap{display:flex;flex-wrap:wrap;gap:0 28px}
.nav a{padding:12px 0 10px;font-weight:600;font-size:1rem;color:var(--text2);text-decoration:none;border-bottom:3px solid transparent}
.nav a:hover{color:var(--ink)}
.nav a[aria-current]{color:var(--ink);border-bottom-color:var(--blue)}
@media (max-width:1240px){.nav .wrap{gap:0 18px}.nav a{font-size:.94rem}}
@media (max-width:1060px){.nav .wrap{gap:0 13px}.nav a{font-size:.88rem}}
.menu{display:none}
@media (max-width:860px){
  .nav{display:none}.brand-tag{display:none}.brand-name{font-size:1.2rem}
  .masthead{border-bottom:1px solid var(--ink)}
  .masthead-row{padding-top:10px;padding-bottom:10px}
  .menu{display:block}
  .menu summary{list-style:none;width:44px;height:44px;border:1px solid var(--rule2);border-radius:3px;display:grid;place-items:center;cursor:pointer}
  .menu summary::-webkit-details-marker{display:none}
  .menu summary span,.menu summary span::before,.menu summary span::after{display:block;width:20px;height:2px;background:var(--ink);position:relative}
  .menu summary span::before,.menu summary span::after{content:"";position:absolute}
  .menu summary span::before{top:-6px}.menu summary span::after{top:6px}
  .nav-mobile{position:absolute;left:0;right:0;background:#fff;border-bottom:1px solid var(--ink);z-index:5;display:flex;flex-direction:column;padding:8px 16px 16px}
  .nav-mobile a{padding:12px 0;border-bottom:1px solid var(--rule);font-weight:600;color:var(--ink);text-decoration:none}
  .wrap{padding:0 16px}
  .utility-links{display:none}
}

/* page head */
.page-head{padding-top:32px}
.crumbs{font-size:.92rem;color:var(--muted);margin-bottom:18px}.crumbs a{color:var(--muted)}
.crumbs [aria-current]{color:var(--ink)}
.kicker{margin:0 0 8px;font-weight:700;font-size:.92rem;color:var(--orange)}
h1{margin:0 0 14px;max-width:880px;font:700 clamp(2rem,4.2vw,3rem)/1.1 var(--serif);letter-spacing:-.02em;color:var(--ink)}
.dek{margin:0 0 20px;max-width:820px;font-size:1.3rem;line-height:1.55;color:var(--text2)}
.byline{display:flex;flex-wrap:wrap;align-items:center;gap:6px 24px;font-size:.95rem;color:var(--muted);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:10px 0}
.byline time,.byline strong{color:var(--ink);font-weight:600}
.byline a{color:var(--muted)}
.byline-actions{margin-left:auto;display:flex;gap:8px}
.byline-actions button{height:34px;padding:0 12px;border:1px solid var(--rule2);background:#fff;border-radius:3px;font:600 .9rem var(--sans);color:var(--text2);cursor:pointer}
@media (max-width:640px){.byline-actions{display:none}.dek{font-size:1.12rem}}

/* layout */
.layout{display:flex;flex-wrap:wrap;gap:56px;align-items:flex-start;padding-top:32px;padding-bottom:72px}
.prose{flex:999 1 620px;min-width:0;max-width:800px}
.rail{flex:0 1 260px;max-width:260px;min-width:0;align-self:stretch;font-size:.9rem;line-height:1.4}
.rail-inner{position:sticky;top:16px;max-height:calc(100vh - 32px);overflow:auto;padding-right:4px}
.rail-h{margin:0 0 8px;padding-bottom:8px;border-bottom:2px solid var(--ink);font-weight:700;color:var(--ink)}
.toc,.related{list-style:none;margin:0 0 28px;padding:0}
.toc li,.related li{border-bottom:1px solid var(--rule)}
.toc a,.related a{display:block;padding:6px 0 6px 10px;color:var(--text2);text-decoration:none;border-left:3px solid transparent}
.toc a:hover,.related a:hover{color:var(--ink)}
.toc a.is-active{color:var(--ink);font-weight:600;border-left-color:var(--blue)}
/* contents: collapsed after 10 entries; the current section always stays visible */
.toc.is-collapsed li:nth-child(n+11){display:none}
.toc.is-collapsed li.is-current{display:block}
.toc-more{display:block;width:100%;margin:-20px 0 28px;padding:9px 10px;border:0;border-bottom:1px solid var(--rule);background:none;text-align:left;font:600 .9rem var(--sans);color:var(--blue);cursor:pointer}
.toc-more:hover{text-decoration:underline}
.toc-m{display:none;border:1px solid var(--rule2);border-radius:3px;margin:0 0 28px;padding:0 16px}
.toc-m summary{cursor:pointer;padding:12px 0;font-weight:700;color:var(--ink)}
.toc-m .toc{margin:0 0 12px;font-size:.98rem}
.rail-box{margin:0 0 28px;padding:16px 18px;background:var(--tint);border-top:3px solid var(--blue)}
.rail-box-h{margin:0 0 6px;font:700 1.02rem var(--serif);color:var(--ink)}
.rail-box p{margin:0 0 10px;color:var(--text2)}
.rail-box a{display:block;padding:4px 0;font-weight:600}
@media (max-width:980px){.rail{display:none}.layout{gap:0;padding-top:24px}.toc-m{display:block}}
/* homepage hero (approved design): intro left, decoder right */
.hero{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);grid-template-areas:"main tool" "links tool";grid-template-rows:auto 1fr;column-gap:48px;align-items:start;padding-top:40px;padding-bottom:44px}
.hero-main{grid-area:main;min-width:0}
.hero-tool{grid-area:tool;min-width:0}
.hero-links{grid-area:links;align-self:start}
@media (max-width:900px){.hero{grid-template-columns:minmax(0,1fr);grid-template-areas:"main" "tool" "links";row-gap:24px}}
.hero-tool .decoder{margin:0}
.page-head-tool{padding-top:28px}
.page-head-tool .crumbs{margin-bottom:10px}
.hero-page{padding-top:8px;padding-bottom:28px;grid-template-areas:"main tool";grid-template-rows:auto}
.hero-page h1{font-size:clamp(2rem,3.6vw,2.7rem)}
.hero-page .hero-meta{margin:16px 0 0}
.hero-page .answer{margin-bottom:20px}
.hero-page .glance{margin:0}
.hero-page .glance td,.hero-page .glance th{padding-top:8px;padding-bottom:8px}
.hero-tool .tool .decoder-body{padding:16px 20px}
/* Equal-height hero on tool pages: the tool card stretches to the left column and its result area takes the spare room */
.hero-page .hero-tool{align-self:stretch;display:flex}
.hero-page .hero-tool .tool{flex:1;display:flex;flex-direction:column;margin:0}
.hero-page .hero-tool .decoder-body{flex:1;display:flex;flex-direction:column}
.hero-page .hero-tool .tool-out{flex:1;display:flex;flex-direction:column;justify-content:center;min-height:72px}
@media (max-width:900px){.hero-page .hero-tool .tool-out{flex:none}}
.hero-tool .tool label{font-size:.95rem}
.hero-tool .tool select,.hero-tool .tool input[type=date]{height:42px;margin-bottom:10px}
.hero-tool .tool .hint{margin:8px 0 0;font-size:.86rem}
.hero-tool .tool .btn{height:44px;margin-top:12px}
.hero-tool .tool .tool-out{margin:6px 0 0;padding:12px 14px}
@media (max-width:900px){.hero-page{grid-template-areas:"main" "tool"}}
.hero .answer{margin:0 0 24px}
.hero .dek{margin-bottom:22px}
.hero-tool .decoder-body{padding:18px 20px}
.hero-tool .decoder-out th,.hero-tool .decoder-out td{padding:7px 0}
.hero-tool .btn{margin-top:14px}
.hero-tool .hint:last-child{margin-bottom:0}
.hero h1{font-size:clamp(2.2rem,4.6vw,3.4rem)}
.hero-meta{margin:0 0 14px;font-size:.95rem;color:var(--muted)}
.hero-links{border-top:1px solid var(--rule);padding-top:14px;font-size:1rem}
.hero-links p:first-child{margin:0 0 6px;font-weight:700;color:var(--ink)}
.hero-links p:last-child{margin:0;display:flex;flex-wrap:wrap;gap:6px 20px}
.trust{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);background:var(--paper)}
.trust-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));font-size:.95rem;line-height:1.45}
.trust-row p{margin:0;padding:16px 20px 16px 0}
.trust-row p+p{padding-left:20px;border-left:1px solid var(--rule)}
.trust-row strong{display:block;color:var(--ink)}
.trust-row span{color:var(--muted)}
@media (max-width:760px){.trust-row p+p{border-left:0;padding-left:0;border-top:1px solid var(--rule)}.hero{padding-top:28px}}

/* prose */
.prose>:first-child{margin-top:0}
.prose h2{margin:52px 0 12px;font:700 clamp(1.5rem,2.6vw,2rem)/1.22 var(--serif);letter-spacing:-.012em;color:var(--ink)}
.prose h3{margin:30px 0 8px;font:700 1.35rem/1.3 var(--sans);color:var(--ink)}
.prose p{margin:0 0 18px}
.prose strong{color:var(--ink);font-weight:700}
.prose ul,.prose ol{margin:0 0 20px;padding-left:24px}
.prose li{margin-bottom:6px}
.prose blockquote{margin:0 0 20px;padding:4px 0 4px 18px;border-left:3px solid var(--rule3);color:var(--text2)}
.answer{background:var(--tint);border-top:3px solid var(--blue);padding:20px 24px;margin:0 0 28px}
.answer-label,.glance-label,.next-label{margin:0 0 6px;font:700 1.2rem/1.3 var(--serif);color:var(--ink)}
.answer p{font-size:1.15rem;line-height:1.6}.answer p:last-child{margin-bottom:0}
.glance{margin:0 0 36px}.glance-label{font:700 1.05rem var(--sans)}
.glance table{width:100%;border-collapse:collapse;font-size:1.03rem}
.glance td{padding:10px 0;border-top:1px solid var(--rule2);vertical-align:top}
.glance tr:last-child td{border-bottom:1px solid var(--rule2)}
.glance td:first-child{width:38%;padding-right:20px;font-weight:600;color:var(--muted)}
.prose li:has(>.tick){list-style:none}
.tick{display:inline-block;width:.9em;height:.9em;margin:0 .5em -.08em -1.4em;border:1.5px solid var(--muted);border-radius:2px}
.prose pre{white-space:pre-wrap;overflow-wrap:anywhere;margin:0 0 28px;padding:18px 20px;background:var(--paper);border:1px solid var(--rule2);border-radius:3px;font:.95rem/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--ink)}
.prose pre code{font:inherit;background:none;padding:0}
.table-wrap{overflow-x:auto;margin:0 0 28px;-webkit-overflow-scrolling:touch}
.table-wrap table{width:100%;min-width:560px;border-collapse:collapse;font-size:1.02rem;line-height:1.5}
.table-wrap caption{caption-side:bottom;text-align:left;padding-top:10px;font-size:.88rem;color:var(--muted)}
.table-wrap th{text-align:left;padding:10px 16px 10px 0;font-size:.88rem;font-weight:700;color:var(--muted);border-bottom:1px solid var(--rule3);vertical-align:bottom}
.table-wrap td{padding:12px 16px 12px 0;border-bottom:1px solid var(--rule);vertical-align:top}
.table-wrap td:first-child{font-weight:600;color:var(--ink)}
.fig{margin:8px 0 32px}
.fig img{border:1px solid #E5E5E0;width:100%}
.fig figcaption{padding-top:10px;font-size:.94rem;line-height:1.5;color:var(--muted)}
.fig figcaption strong{color:var(--ink)}
.next-box{border:1px solid var(--ink);padding:20px 24px;margin:40px 0}
.next-box ul{margin:0;padding-left:20px}
.faq-list{border-top:2px solid var(--ink);margin-top:16px}
.faq{border-bottom:1px solid var(--rule2);padding:14px 0}
.faq summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--blue);font-size:1.4rem;line-height:1.2}
.faq[open] summary::after{content:"−"}
.faq summary h3{margin:0;font-size:1.15rem}
.pt-all{border:1px solid var(--rule2);padding:12px 16px;margin:24px 0}
.pt-all summary{cursor:pointer;font-weight:600;color:var(--blue)}
.pt-all[open] summary{margin-bottom:12px}
.faq p{margin:10px 0 0;color:var(--text2)}
.seq{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);margin-top:44px}
.seq a{padding:14px 16px 14px 0;text-decoration:none}.seq a span{display:block;font-size:.85rem;color:var(--muted)}
.seq .seq-next{text-align:right;padding:14px 0 14px 16px;border-left:1px solid var(--rule)}
.author-box{margin-top:40px;background:var(--paper);border:1px solid var(--rule);padding:20px 24px;font-size:1rem;color:var(--text2)}
.author-box p{margin:0}.author-label{font-size:.85rem;color:var(--muted)}.author-name{font-weight:700;margin-bottom:4px!important}
.sources{margin-top:40px;font-size:.95rem;color:var(--text2)}
.sources-h{font-weight:700;color:var(--ink);margin:0 0 6px}
.sources ol{padding-left:22px;margin:0}
.sources a{word-break:break-word}
.disclaimer{margin-top:22px;padding-top:16px;border-top:1px solid var(--rule);font-size:.92rem;color:var(--muted)}

/* decoder tool */
.decoder{border:1px solid var(--ink);border-radius:3px;margin:0 0 36px}
.decoder-head{background:var(--ink);color:#fff;padding:12px 20px;display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.decoder-title{margin:0;font:600 1.25rem var(--serif);color:#fff}
.decoder-head span{font-size:.85rem;color:#D1D5DB}
.decoder-body{padding:20px}
.decoder label{display:block;font-weight:700;color:var(--ink);margin-bottom:6px}
.decoder input{width:100%;height:52px;padding:0 14px;font:600 1.3rem var(--sans);letter-spacing:.1em;text-transform:uppercase;color:var(--ink);border:1px solid #6B7280;border-radius:3px}
.decoder .hint{font-size:.9rem;color:var(--muted);margin:6px 0 16px}
.decoder-out{width:100%;border-collapse:collapse;font-size:1rem}
.decoder-out th{text-align:left;font-weight:400;color:var(--muted);padding:8px 0;border-top:1px solid var(--rule)}
.decoder-out td{text-align:right;font-weight:700;color:var(--ink);padding:8px 0;border-top:1px solid var(--rule)}
.decoder-out tr:last-child>*{border-bottom:1px solid var(--rule)}
.decoder-out .ok{color:#166534}.decoder-out .bad{color:#9A3412}
.tool{margin:8px 0 36px}
.decoder p.decoder-title{margin:0;font:600 1.25rem var(--serif);color:#fff}
.tool select,.tool input[type=date]{width:100%;height:46px;padding:0 12px;margin:0 0 14px;font:400 1rem var(--sans);color:var(--ink);background:#fff;border:1px solid #6B7280;border-radius:3px}
.tool input[type=date]{margin-bottom:4px}
.tool label{margin-bottom:4px}
.tool-out{margin:14px 0 6px;padding:14px 16px;background:var(--tint);border-radius:3px}
.tool-out .decoder-out th span{display:block;font-weight:700;color:var(--ink)}
.tool-out .decoder-out td{vertical-align:top;max-width:55%}
.tool-wait{margin:0;color:var(--muted)}
.tool-result{margin:12px 0 0;font-size:1rem;line-height:1.5}
.tool-result:first-child{margin-top:0}
.tool-result.ok strong{color:#166534}.tool-result.bad strong{color:#9A3412}
.tool-sub{color:var(--muted);font-size:.9rem}
.tool .btn{margin-top:14px}
.tool-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0 12px}
@media (max-width:420px){.tool-row{grid-template-columns:1fr}}
.btn{display:flex;align-items:center;justify-content:center;height:50px;margin-top:18px;border-radius:3px;background:var(--blue);color:#fff;font-weight:700;text-decoration:none}
.btn:hover{background:var(--blue-dk);color:#fff}

/* footer */
.site-footer{background:var(--ink);color:#D1D5DB;font-size:.95rem;line-height:1.6;margin-top:24px}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.7fr) repeat(4,minmax(0,1fr));gap:36px 32px;padding-top:52px;padding-bottom:36px}
.footer-grid nav a{display:block;color:#D1D5DB;margin-bottom:6px;text-decoration:none}
.footer-grid nav a:hover,.footer-meta a:hover,.footer-legal a:hover{color:#fff;text-decoration:underline}
.footer-brand{display:flex;align-items:center;gap:12px;margin:0 0 14px;font:700 1.3rem var(--serif);color:#fff;text-decoration:none}
.footer-brand svg{flex:none}
.footer-about p{margin:0 0 12px;max-width:400px}
.footer-note{font-size:.9rem;color:#9CA3AF}
.footer-meta{font-size:.9rem;color:#9CA3AF}
.footer-meta a{color:#D1D5DB}
.footer-h{margin:4px 0 12px;font-weight:700;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase;color:#fff}
.footer-base{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;border-top:1px solid #374151;padding:16px 0 26px;font-size:.88rem;color:#9CA3AF}
.footer-legal{display:flex;flex-wrap:wrap;gap:4px 20px}
.footer-legal a{color:#9CA3AF}
@media (max-width:1100px){.footer-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.footer-about{grid-column:1/-1}.footer-about p{max-width:640px}}
@media (max-width:700px){.footer-grid{grid-template-columns:1fr 1fr;padding-top:40px}}
@media print{.utility,.nav,.menu,.rail,.byline-actions,.site-footer,.seq,.decoder{display:none}body{font-size:12pt}.prose{max-width:none}a{color:inherit}}
/* Guides index: full-width card grid (list pages have no contents rail) */
.prose-wide{max-width:none;flex-basis:100%}
.prose-wide>p{max-width:760px}
.prose .guide-list{list-style:none;padding:0;margin:28px 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.guide-list li{position:relative;display:flex;flex-direction:column;margin:0;padding:20px 22px;border:1px solid var(--rule2);border-top:3px solid var(--blue);border-radius:3px;background:#fff}
.guide-list li:hover{border-color:var(--blue)}
.guide-list a{font:700 1.15rem/1.3 var(--serif);text-decoration:none;color:var(--ink)}
.guide-list a::after{content:"";position:absolute;inset:0}
.guide-list li:hover a{color:var(--blue)}
.guide-list p{margin:10px 0 14px;color:var(--muted);font-size:.98rem;line-height:1.5;flex:1}
.guide-more{font-weight:600;font-size:.95rem;color:var(--blue)}