/* KnowledgeBase — shared design system. No framework. */
:root{
  --bg:#ffffff; --fg:#1a2230; --muted:#5c6675; --line:#e5e8ee; --soft:#f5f7fa;
  --accent:#0f7d74; --accent-2:#0b5f58; --accent-soft:#e6f4f2;
  --warn-bg:#fff7e6; --warn-line:#f0c869; --info-bg:#eef4ff; --info-line:#b9cdf5;
  --maxw:1080px; --radius:12px;
  --sans:"Segoe UI",system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;
  --serif:Georgia,"Times New Roman",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);line-height:1.6;font-size:17px}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
a{color:var(--accent-2);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.25;color:#0e1726}
h1{font-size:2.1rem;margin:.2em 0 .3em}
h2{font-size:1.5rem;margin:1.8em 0 .5em;padding-top:.2em}
h3{font-size:1.2rem;margin:1.4em 0 .4em}
p{margin:.6em 0}
.lead{font-size:1.15rem;color:var(--muted)}
.skip-link{position:absolute;left:-999px;top:0;background:var(--accent);color:#fff;padding:8px 14px;z-index:20}
.skip-link:focus{left:8px;top:8px}

/* header */
.site-header{border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.95);backdrop-filter:blur(6px);z-index:10}
.header-inner{display:flex;align-items:center;gap:18px;padding-top:12px;padding-bottom:12px;flex-wrap:wrap}
.brand{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font-weight:800;font-size:1.15rem;color:#0e1726}
.brand-hub{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--accent-2)}
.main-nav{display:flex;gap:16px;flex-wrap:wrap;margin-left:auto}
.main-nav a{color:var(--fg);font-size:.95rem;font-weight:500}
.main-nav a[aria-current=page]{color:var(--accent-2);text-decoration:underline}
.header-actions{display:flex;align-items:center;gap:12px}
.lang-switcher{display:flex;gap:6px;font-size:.85rem}
.lang-switcher a{padding:2px 6px;border-radius:6px;color:var(--muted)}
.lang-switcher a.lang-current{background:var(--accent-soft);color:var(--accent-2);font-weight:700}
.cta{background:var(--accent);color:#fff;padding:8px 14px;border-radius:8px;font-weight:600;font-size:.9rem}
.cta:hover{background:var(--accent-2);text-decoration:none}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;font-size:1.1rem;padding:4px 10px;cursor:pointer}

/* layout */
main.wrap{padding-top:22px;padding-bottom:60px}
.breadcrumb{font-size:.85rem;color:var(--muted);margin:6px 0 10px}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0}
.breadcrumb li+li::before{content:"/";margin-right:6px;color:var(--line)}
.page-meta{font-size:.85rem;color:var(--muted);display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.badge{background:var(--accent-soft);color:var(--accent-2);padding:2px 10px;border-radius:20px;font-weight:600;font-size:.78rem}

/* resource */
.resource{max-width:760px}
.resource-desc{font-size:1.12rem;color:var(--muted)}
.resource-body h2{border-top:1px solid var(--line)}
.resource-body>p:first-of-type{font-size:1.05rem}
.toc{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;margin:18px 0}
.toc-title{font-weight:700;font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;margin:.2em 0 .5em;color:var(--muted)}
.toc ul{margin:0;padding-left:18px;columns:2;column-gap:24px}
.toc a{color:var(--fg)}

/* tables */
.table-wrap{overflow-x:auto;margin:1em 0;border:1px solid var(--line);border-radius:var(--radius)}
table{border-collapse:collapse;width:100%;font-size:.95rem}
caption{text-align:left;font-size:.85rem;color:var(--muted);padding:8px 12px;border-bottom:1px solid var(--line)}
th,td{padding:9px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:var(--soft);font-size:.82rem;text-transform:uppercase;letter-spacing:.03em;color:var(--muted)}
tbody th{font-weight:600}
tbody tr:last-child th,tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:var(--accent-soft)}

/* callouts */
.callout{border-radius:var(--radius);padding:14px 18px;margin:1.2em 0;border:1px solid}
.callout-title{font-weight:700;margin:0 0 .3em}
.callout-info{background:var(--info-bg);border-color:var(--info-line)}
.callout-warn{background:var(--warn-bg);border-color:var(--warn-line)}
.callout p{margin:.3em 0}

/* stats */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin:1.2em 0}
.stat{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:16px;text-align:center}
.stat-value{display:block;font-size:1.7rem;font-weight:800;color:var(--accent-2)}
.stat-label{font-size:.85rem;color:var(--muted)}

/* faq */
.faq-item{border:1px solid var(--line);border-radius:10px;margin:8px 0;padding:2px 14px;background:#fff}
.faq-item summary{cursor:pointer;font-weight:600;padding:10px 0;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{content:"+";color:var(--accent);font-weight:800;margin-right:8px}
.faq-item[open] summary::before{content:"–"}
.faq-answer{padding-bottom:10px;color:#333}

/* sources */
.sources{margin-top:2em;font-size:.92rem;color:var(--muted)}
.sources ol{padding-left:20px}
.sources a{word-break:break-word}

/* related + cards */
.related{margin-top:2.4em;border-top:1px solid var(--line);padding-top:1em}
.related-list,.feature-list{list-style:none;padding:0;display:grid;gap:10px}
.related-list a,.feature-list a{display:block;border:1px solid var(--line);border-radius:10px;padding:12px 14px;color:var(--fg)}
.related-list a:hover,.feature-list a:hover{border-color:var(--accent);text-decoration:none;background:var(--accent-soft)}
.rel-kind{display:block;font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--accent-2);margin-bottom:2px}
.card-grid{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin:1.2em 0}
.card a{display:block;height:100%;border:1px solid var(--line);border-radius:var(--radius);padding:18px;color:var(--fg)}
.card a:hover{border-color:var(--accent);background:var(--accent-soft);text-decoration:none}
.card h3{margin:.1em 0 .3em}
.card p{color:var(--muted);font-size:.92rem;margin:0}
.card-count{display:inline-block;margin-top:10px;font-size:.75rem;color:var(--accent-2);font-weight:600;text-transform:uppercase;letter-spacing:.05em}

/* hero */
.hub-hero{padding:26px 0 8px}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;color:var(--accent-2);font-weight:700;margin:0}
.hub-hero h1{font-size:2.5rem;margin:.1em 0}
.section-title{border-top:1px solid var(--line);padding-top:.6em}
.section-head h1{margin-bottom:.1em}

/* tools */
.tool-embed{border:1px solid var(--line);border-radius:var(--radius);padding:20px;background:var(--soft);margin:1.4em 0}
.tool-note{font-size:.8rem;color:var(--muted);margin:12px 0 0}
.tool label{display:block;font-weight:600;font-size:.9rem;margin:12px 0 4px}
.tool input,.tool select{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;font-size:1rem;background:#fff}
.tool .field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.tool button.run{margin-top:16px;background:var(--accent);color:#fff;border:none;padding:11px 18px;border-radius:8px;font-weight:600;cursor:pointer;font-size:1rem}
.tool button.run:hover{background:var(--accent-2)}
.tool-result{margin-top:16px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px}
.tool-result .big{font-size:2rem;font-weight:800;color:var(--accent-2)}
.chip{display:inline-block;background:#fff;border:1px solid var(--line);border-radius:20px;padding:6px 12px;margin:4px;font-size:.95rem}
.gen-output{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}

/* cite */
.cite-row{margin-top:2em}
.cite-btn{background:none;border:1px solid var(--accent);color:var(--accent-2);border-radius:8px;padding:8px 14px;cursor:pointer;font-weight:600}
.cite-btn:hover{background:var(--accent-soft)}

/* footer */
.site-footer{border-top:1px solid var(--line);background:var(--soft);padding:30px 0;margin-top:40px;font-size:.9rem}
.footer-nav{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:12px}
.footer-about{color:var(--muted);max-width:640px}
.footer-meta{color:var(--muted);font-size:.82rem}

/* responsive */
@media (max-width:760px){
  body{font-size:16px}
  .nav-toggle{display:block;margin-left:auto}
  .main-nav{display:none;flex-basis:100%;flex-direction:column;gap:10px;margin:8px 0}
  .main-nav.open{display:flex}
  .header-actions{flex-basis:100%;justify-content:space-between}
  .toc ul{columns:1}
  .hub-hero h1{font-size:1.9rem}
  .tool .field-row{grid-template-columns:1fr}
}
@media print{
  .site-header,.site-footer,.cite-row,.tool-embed,.lang-switcher,.nav-toggle{display:none}
  a{color:#000;text-decoration:underline}
  body{font-size:12pt}
}

/* charts */
.kb-chart{margin:1.4em 0;border:1px solid var(--line);border-radius:var(--radius);padding:16px;background:#fff}
.kb-chart .chart-title{font-weight:700;margin:0 0 10px;color:#0e1726}
.chart-wrap{border:none;overflow-x:auto}
.kb-chart-svg{max-width:100%;height:auto;display:block;margin:0 auto}
.chart-data{margin-top:12px;font-size:.9rem}
.chart-data thead th{background:var(--soft)}
.chart-source{font-size:.8rem;color:var(--muted);margin:10px 0 0}

/* language dropdown */
.lang-switcher{display:inline-flex;align-items:center;gap:4px}
.lang-label{font-size:1rem;line-height:1}
.lang-select{appearance:auto;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--fg);font-size:.85rem;padding:5px 8px;cursor:pointer;max-width:150px}
.lang-select:hover{border-color:var(--accent)}

/* machine-readable data links */
.data-downloads{font-size:.85rem;color:var(--muted);margin-top:1.6em;border-top:1px dashed var(--line);padding-top:10px}
.data-downloads a{font-weight:600}