/* Knowledge-only extension of the existing Silver shell. */
.kb-main,.kb-compare{--kb-ink:#202b34;--kb-muted:#505d68;--kb-line:#cbd2d8;--kb-accent:#1765c1;--kb-tint:#eaf2fd;color:var(--kb-ink);width:min(1240px,calc(100% - 64px));margin:0 auto;padding:52px 0 32px;min-width:0}
.kb-main *, .kb-compare *{box-sizing:border-box}
.kb-main [hidden]{display:none!important}
.kb-main :is(input,select,button){font:inherit}
.kb-main a,.kb-compare a{color:inherit;text-decoration:none}
.kb-main :is(a,button,input,select,summary):focus-visible,.kb-compare a:focus-visible{outline:2px solid var(--kb-accent);outline-offset:4px}
.kb-main ::selection,.kb-compare ::selection{background:#caddf7;color:#162b45}
.kb-main :is(input,select){caret-color:var(--kb-accent);color:var(--kb-ink)}
.kb-main button{cursor:pointer}
.kb-main svg,.kb-compare svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
.kb-heading{margin:0 0 36px}
.kb-heading h1,.kb-compare>h1{font-size:36px;line-height:1.35;letter-spacing:.02em;font-weight:700;margin:0 0 28px}
#kb-search-form label{display:block;font-size:14px;font-weight:600;margin-bottom:10px}
.kb-search-field{display:flex;align-items:center;gap:12px;min-height:58px;padding:5px 7px 5px 18px;background:#fff;border:1px solid #aab7c2;border-radius:6px}
.kb-search-field:focus-within{border-color:var(--kb-accent);box-shadow:0 0 0 1px var(--kb-accent)}
.kb-search-field input{display:block;width:100%;min-width:0;height:42px;border:0;outline:0;border-radius:0;background:transparent;padding:4px 0;font-size:16px;line-height:1.5}
.kb-search-field input:focus-visible{outline:none}
.kb-search-field input::placeholder{color:#5d6975;opacity:1}
.kb-search-field input::-webkit-search-cancel-button{display:none}
.kb-search-field button{flex-shrink:0;min-height:44px;padding:8px 18px;border:0;border-radius:4px;font-size:15px;white-space:nowrap}
.kb-submit{background:#2d3b46;color:#fff}
.kb-submit:hover{background:#162530}
#kb-clear{background:transparent;color:var(--kb-muted);padding-inline:8px}
#kb-clear:hover{text-decoration:underline}
.kb-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:40px;align-items:start}
.kb-filters{min-width:0}
#kb-categories{display:grid;gap:6px}
#kb-categories a{min-height:50px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 14px;border-radius:5px;font-size:16px;line-height:1.5}
#kb-categories a span{color:var(--kb-muted);font-size:13px;font-variant-numeric:tabular-nums}
#kb-categories a:hover{background:#e9edf0}
#kb-categories a[aria-current]{background:var(--kb-tint);color:#12569f;font-weight:600}
.kb-topic-nav{margin-top:28px}
.kb-topic-nav label{display:block;font-size:14px;font-weight:600;margin-bottom:10px}
.kb-topic-nav select{width:100%;min-height:46px;background:#fff;border:1px solid var(--kb-line);border-radius:5px;padding:10px 12px;font-size:16px;line-height:1.5}
.kb-result-bar{display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-bottom:24px}
.kb-result-bar h2{font-size:22px;line-height:1.45;margin:0;font-weight:600}
.kb-result-bar p{font-size:14px;color:var(--kb-muted);margin:0;white-space:nowrap}
.kb-results-area,.kb-result-copy{min-width:0}
.kb-result h3{font-weight:600;font-size:19px;line-height:1.65;margin:0}
.kb-result h3 a{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}
.kb-result h3 a svg{margin-top:5px;transition:transform 160ms ease}
.kb-result:hover h3 a{color:var(--kb-accent)}
.kb-result:hover h3 a svg{transform:translateX(3px)}
.kb-result-meta{font-size:13px;color:var(--kb-muted);line-height:1.6;margin:14px 0 0}
.kb-excerpt{font-size:15px;line-height:1.85;color:var(--kb-muted);margin:12px 38px 0 0;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}
.kb-empty{padding:56px 28px;background:#fff;border-radius:8px;text-align:center}
.kb-empty h3,.kb-empty h1{font-size:24px;margin:0 0 16px}
.kb-empty p{font-size:16px;line-height:1.8;margin:0 0 24px}
.kb-empty button,.kb-empty>a{display:inline-block;min-height:44px;background:#2d3b46;color:#fff;border:0;border-radius:5px;padding:12px 20px}

/* A: model-led browsing followed by broad topic cards. */
.variant-a .kb-heading{max-width:760px;margin:0 auto 32px;text-align:center}
.variant-a #kb-search-form{text-align:left}
.variant-a .kb-layout{display:block}
.variant-a .kb-filters{display:flex;justify-content:space-between;gap:24px;align-items:end;padding:12px 0 32px}
.variant-a #kb-categories{display:flex;gap:10px;flex-wrap:wrap}
.variant-a #kb-categories a{padding:10px 20px;background:#fff;border:1px solid var(--kb-line)}
.variant-a #kb-categories a[aria-current]{background:#2d3b46;color:#fff;border-color:#2d3b46}
.variant-a #kb-categories a[aria-current] span{color:#e3ebf1}
.variant-a .kb-topic-nav{width:220px;margin:0;flex-shrink:0}
.kb-result-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.kb-result-grid .kb-result{grid-column:span 2;background:#fff;border-radius:8px;overflow:hidden}
.kb-result-grid .kb-model-guide{grid-column:span 1}
.kb-result-grid .kb-result-copy{padding:24px}
.kb-result-grid .kb-model-guide .kb-result-copy{padding:20px}
.kb-result-grid .kb-model-guide h3{font-size:17px;line-height:1.65}
.kb-model-image{display:block;background:#e9edf1}
.kb-model-image img{display:block;width:100%;height:auto;aspect-ratio:1.55;object-fit:cover;transition:transform 240ms ease}
.kb-model-guide:hover img{transform:scale(1.015)}
.kb-illustration{display:block;margin-top:10px;color:var(--kb-muted);font-size:11px}

/* B: stable filter rail and a denser, excerpt-bearing search list. */
.variant-b .kb-heading{max-width:860px;margin-left:260px}
.variant-b .kb-filters{position:sticky;top:76px}
.kb-result-list{background:#fff;border-radius:8px;padding:0 28px}
.kb-result-list .kb-result{padding:26px 0;border-bottom:1px solid var(--kb-line)}
.kb-result-list .kb-result:last-child{border-bottom:0}

/* C: a navigable reference index with topic disclosures and paired titles. */
.variant-c .kb-heading{display:grid;grid-template-columns:1fr 1.4fr;align-items:end;gap:40px;padding-bottom:30px;border-bottom:1px solid var(--kb-line)}
.variant-c .kb-heading h1{margin:0}
.variant-c .kb-layout{grid-template-columns:220px minmax(0,1fr)}
.variant-c .kb-filters{position:sticky;top:76px}
.kb-topic-group{margin-bottom:20px;border:1px solid var(--kb-line);border-radius:7px;background:#fff;overflow:hidden}
.kb-topic-group>summary{display:flex;align-items:center;gap:14px;min-height:64px;padding:18px 24px;font-size:19px;font-weight:600;cursor:pointer;list-style:none;background:#e9eef2}
.kb-topic-group>summary::-webkit-details-marker{display:none}
.kb-topic-group>summary span{font-weight:400;font-size:13px;color:var(--kb-muted);margin-left:auto;white-space:nowrap}
.kb-topic-group>summary svg{transition:transform 180ms ease}
.kb-topic-group[open]>summary svg{transform:rotate(180deg)}
.kb-topic-group>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));padding:0 24px;gap:0 28px}
.kb-topic-group .kb-result{padding:22px 0;border-bottom:1px solid #e4e8eb}
.kb-topic-group .kb-result:last-child{border-bottom:0}
.kb-topic-group h3{font-size:16px;line-height:1.7}
.kb-topic-group h3 svg{width:18px;height:18px}
.kb-topic-group .kb-result-meta{font-size:12px;margin-top:10px}

/* Shared long-form reading; table scrolling is local to the table. */
.kb-back{display:inline-flex;align-items:center;gap:9px;min-height:44px;margin-bottom:28px;color:var(--kb-muted);font-size:15px}
.kb-back svg{transform:rotate(180deg);width:19px;height:19px}
.kb-back:hover{color:var(--kb-accent)}
.kb-reading-layout{display:grid;grid-template-columns:minmax(0,800px) minmax(200px,260px);gap:56px;align-items:start}
.kb-article{background:#fff;border-radius:8px;padding:40px 44px}
.kb-article h1{font-size:32px;line-height:1.55;letter-spacing:.01em;margin:0;font-weight:700;overflow-wrap:anywhere}
.kb-article-meta{font-size:14px;color:var(--kb-muted);line-height:1.65;margin:20px 0 36px;padding-bottom:24px;border-bottom:1px solid var(--kb-line)}
.kb-prose{font-size:18px;line-height:1.95;overflow-wrap:anywhere}
.kb-prose p{margin:0 0 24px}
.kb-prose h2{font-size:23px;line-height:1.6;font-weight:600;margin:44px 0 18px;scroll-margin-top:80px}
.kb-prose h2:first-child{margin-top:0}
.kb-prose :is(ul,ol){padding-left:1.4em;margin:18px 0 28px}
.kb-prose li{padding-left:3px;margin:10px 0}
.kb-prose strong{font-weight:600}
.kb-prose a{color:#155fae;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}
.kb-prose a:hover{color:#123d72}
.kb-prose pre{white-space:pre-wrap}
.kb-prose blockquote{margin:24px 0;padding:18px 22px;background:#eef3f7}
.kb-table-wrap{max-width:100%;overflow:auto;margin:28px 0;border:1px solid var(--kb-line);border-radius:5px}
.kb-table-wrap table{border-collapse:collapse;width:100%;font-size:16px;line-height:1.7}
.kb-table-wrap :is(th,td){text-align:left;padding:14px 18px;border-bottom:1px solid var(--kb-line)}
.kb-table-wrap th{background:#edf1f5;font-weight:600}
.kb-table-wrap tr:last-child td{border-bottom:0}
.kb-back-bottom{margin:32px 0 0}
.kb-contents{position:sticky;top:80px;min-width:0}
.kb-contents summary{display:flex;align-items:center;justify-content:space-between;font-size:15px;font-weight:600;padding:0 0 16px;cursor:pointer;list-style:none}
.kb-contents summary::-webkit-details-marker{display:none}
.kb-contents summary svg{width:16px;height:16px}
.kb-contents details[open] summary svg{transform:rotate(180deg)}
.kb-contents nav{display:grid;gap:4px;border-top:1px solid var(--kb-line);padding-top:12px}
.kb-contents nav a{display:block;font-size:14px;line-height:1.65;padding:10px 0;color:var(--kb-muted)}
.kb-contents nav a:hover{color:var(--kb-accent)}

/* The comparison entry is separate from the customer reading routes. */
.kb-compare>p{color:var(--kb-muted);margin:0 0 36px;font-size:16px;line-height:1.8}
.kb-compare-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.kb-preview{background:#fff;padding:28px;border-radius:8px;display:flex;flex-direction:column;min-width:0}
.kb-preview h2{font-size:23px;line-height:1.5;margin:0 0 14px}
.kb-preview>p{font-size:15px;line-height:1.8;margin:0 0 24px;color:var(--kb-muted);min-height:54px}
.kb-preview-topology{height:250px;background:#f2f5f7;border:1px solid var(--kb-line);border-radius:5px;padding:16px;overflow:hidden;display:grid;gap:12px;align-content:start;margin-bottom:28px}
.kb-preview-topology span{font-size:11px;line-height:1.65;background:#fff;padding:12px;border-radius:3px}
.preview-a .kb-preview-topology{grid-template-columns:repeat(2,minmax(0,1fr))}
.preview-a .kb-preview-topology span:first-child{grid-column:span 2}
.preview-b .kb-preview-topology{padding-left:54px;gap:1px}
.preview-b .kb-preview-topology span{border-bottom:1px solid var(--kb-line)}
.preview-c .kb-preview-topology span{padding:8px 12px;border-bottom:1px solid var(--kb-line)}
.kb-compare-open{margin-top:auto;display:flex;align-items:center;justify-content:space-between;min-height:48px;font-size:16px;font-weight:600;border-top:1px solid var(--kb-line);padding-top:14px}
.kb-compare-open:hover{color:var(--kb-accent)}
.kb-site-link{display:inline-flex;align-items:center;min-height:48px;margin-top:28px;font-size:15px}
.kb-site-link:hover{text-decoration:underline}

@media(max-width:1050px){
  .kb-main,.kb-compare{width:calc(100% - 48px)}
  .kb-layout,.variant-c .kb-layout{grid-template-columns:190px minmax(0,1fr);gap:28px}
  .variant-b .kb-heading{margin-left:218px}
  .kb-result-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .kb-result-grid .kb-result{grid-column:span 1}
  .variant-a .kb-filters{align-items:center;flex-wrap:wrap}
  .kb-reading-layout{grid-template-columns:minmax(0,1fr) 210px;gap:28px}
  .kb-article{padding:32px}
  .kb-article h1{font-size:28px}
  .kb-topic-group>div{grid-template-columns:1fr}
  .kb-compare-grid{gap:16px}
  .kb-preview{padding:20px}
}
@media(max-width:760px){
  .kb-main,.kb-compare{width:calc(100% - 36px);padding-top:28px}
  .kb-heading,.variant-a .kb-heading,.variant-b .kb-heading{margin:0 0 24px;text-align:left}
  .kb-heading h1,.kb-compare>h1{font-size:28px;margin-bottom:22px}
  .kb-layout,.variant-c .kb-layout{display:block}
  .kb-filters,.variant-b .kb-filters,.variant-c .kb-filters{position:static;margin-bottom:28px}
  #kb-categories,.variant-a #kb-categories{display:flex;flex-wrap:wrap;gap:6px}
  #kb-categories a,.variant-a #kb-categories a{min-height:44px;font-size:14px;padding:10px 12px;gap:8px}
  #kb-categories a span{font-size:12px}
  .variant-a .kb-filters{display:block;padding:0}
  .kb-topic-nav,.variant-a .kb-topic-nav{display:flex;align-items:center;gap:14px;width:100%;margin:18px 0 0}
  .kb-topic-nav label{flex-shrink:0;margin:0;font-size:14px}
  .kb-topic-nav select{max-width:260px}
  .kb-search-field{padding-left:12px;gap:8px}
  .kb-search-field>svg{width:18px;height:18px}
  .kb-search-field button{padding-inline:12px}
  .kb-search-field input{font-size:16px}
  .kb-result-bar{margin-bottom:18px}
  .kb-result-bar h2{font-size:20px}
  .kb-result-grid{gap:16px}
  .kb-result-grid .kb-result-copy,.kb-result-grid .kb-model-guide .kb-result-copy{padding:20px}
  .kb-result-list{padding:0 22px}
  .kb-result h3{font-size:18px}
  .kb-result-list .kb-result{padding:24px 0}
  .kb-excerpt{margin-right:0;-webkit-line-clamp:3}
  .variant-c .kb-heading{display:block;padding-bottom:22px}
  .variant-c .kb-heading h1{margin-bottom:22px}
  .kb-topic-group>summary{padding:16px 20px;font-size:18px}
  .kb-topic-group>div{padding:0 20px}
  .kb-reading-layout{display:flex;flex-direction:column;gap:24px}
  .kb-contents{order:-1;position:static;width:100%;background:#e9eef2;padding:18px;border-radius:6px}
  .kb-contents summary{min-height:28px;padding-bottom:0}
  .kb-contents nav{margin-top:14px;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 18px}
  .kb-contents nav a{font-size:13px;padding:8px 0}
  .kb-article{width:100%;padding:28px 22px}
  .kb-article h1{font-size:25px;line-height:1.6}
  .kb-prose{font-size:17px;line-height:1.95}
  .kb-prose h2{font-size:21px;margin-top:36px}
  .kb-article-meta{margin-bottom:26px}
  .kb-back{margin-bottom:18px}
  .kb-compare-grid{grid-template-columns:1fr;gap:24px}
  .kb-preview{padding:24px}
  .kb-preview>p{min-height:0}
  .kb-preview-topology{height:210px}
}
@media(max-width:480px){
  .kb-result-grid{grid-template-columns:1fr}
  .kb-result-grid .kb-model-guide h3{font-size:18px}
  .kb-model-image img{aspect-ratio:1.9}
  .kb-empty{padding:36px 20px}
  .kb-contents nav{grid-template-columns:1fr}
  .kb-table-wrap :is(th,td){padding:12px;font-size:15px}
  .kb-search-field{gap:6px}
  #kb-clear{font-size:13px;padding-inline:4px}
  .kb-search-field .kb-submit{font-size:14px;padding-inline:10px}
}
@media(prefers-reduced-motion:reduce){
  .kb-main *{scroll-behavior:auto!important;transition:none!important;animation:none!important}
}