/* ============================================================
   TerminalRow — main.css
   Mobile-first, custom properties, no framework
   Industrial controls & automation design system
   ============================================================ */

/* ── Custom properties ─────────────────────────────────────── */
:root {
  /* Colours */
  --cb-bg:           #080F1E;
  --cb-bg-alt:       #0D1526;
  --cb-surface:      #111D2E;
  --cb-surface-2:    #172133;
  --cb-surface-3:    #1C2840;
  --cb-border:       #1E2E45;
  --cb-border-light: #283D58;
  --cb-text:         #D8E6F4;
  --cb-text-muted:   #6E8CA8;
  --cb-text-dim:     #3E5570;
  --cb-accent:       #F5A524;
  --cb-accent-hover: #D4891A;
  --cb-accent-dim:   rgba(245,165,36,.10);
  --cb-accent-glow:  rgba(245,165,36,.18);
  --cb-link:         #4D9FFF;
  --cb-link-hover:   #79BCFF;
  --cb-code-bg:      #0A1220;
  --cb-code-border:  #1A2A3E;
  --cb-success:      #2EA84A;
  --cb-warning:      #C98A00;
  --cb-danger:       #E5393A;
  --cb-safety:       rgba(205,138,0,.14);
  --cb-shadow-sm:    0 1px 3px rgba(0,0,0,.6);
  --cb-shadow:       0 2px 8px rgba(0,0,0,.5), 0 8px 24px rgba(0,0,0,.3);
  --cb-shadow-lg:    0 4px 16px rgba(0,0,0,.6), 0 16px 40px rgba(0,0,0,.4);

  /* Typography */
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', 'Courier New', monospace;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Sizing */
  --max-width:      1200px;
  --content-width:   760px;
  --toc-width:       224px;
  --nav-height:       58px;
  --border-radius:     6px;
  --border-radius-lg: 10px;
  --border-radius-xl: 16px;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--cb-bg);
  color: var(--cb-text);
  font-size: 1rem;
  line-height: 1.72;
  min-height: 100vh;
}
img, video, svg { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font: inherit; }
a { color: var(--cb-link); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--cb-link-hover); }

/* ── Skip link ──────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--cb-accent);
  color: #000;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius);
  font-weight: 700;
  z-index: 10000;
  text-decoration: none;
}
.skip-link:focus { top: var(--space-2); }

/* ================================================================
   SITE HEADER / NAV  (supports both naming systems)
   ================================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(8,15,30,.96);
  border-bottom: 1px solid var(--cb-border);
  height: var(--nav-height);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* ── nav-inner (homepage / pillar pattern) ── */
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

/* ── .container .header-inner (article pattern) ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.header-inner {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

/* ── Logo — both .site-logo and .logo ── */
.site-logo,
.logo {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cb-text);
}
.site-logo span,
.logo span { color: var(--cb-accent); }
.site-logo:hover,
.logo:hover { color: var(--cb-text); text-decoration: none; }
.site-logo-mark { width: 28px; height: 28px; flex-shrink: 0; }
.site-logo-text { font-family: var(--font-mono); }
.site-logo-text span { color: var(--cb-accent); }

/* ── Desktop nav — .nav-menu (homepage) ── */
.nav-menu {
  display: none;
  list-style: none;
  flex: 1;
  gap: 2px;
}
.nav-menu a {
  display: block;
  padding: 6px 10px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--cb-text-muted);
  text-decoration: none;
  border-radius: var(--border-radius);
  white-space: nowrap;
  transition: color .15s, background .15s;
}
.nav-menu a:hover,
.nav-menu a[aria-current="page"] {
  color: var(--cb-text);
  background: var(--cb-surface);
}
.nav-cta {
  margin-left: auto;
  display: none !important;
  font-size: 0.8125rem !important;
  font-weight: 600 !important;
  color: var(--cb-accent) !important;
  border: 1px solid rgba(245,165,36,.5) !important;
  border-radius: var(--border-radius) !important;
  padding: 5px 12px !important;
  background: var(--cb-accent-dim) !important;
  transition: background .15s, border-color .15s !important;
}
.nav-cta:hover { background: var(--cb-accent-glow) !important; border-color: var(--cb-accent) !important; }

/* ── Desktop nav — .primary-nav (article pattern) ── */
.primary-nav {
  display: none;
  flex: 1;
}
.primary-nav ul {
  list-style: none;
  display: flex;
  gap: 2px;
}
.primary-nav a {
  display: block;
  padding: 6px 10px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--cb-text-muted);
  text-decoration: none;
  border-radius: var(--border-radius);
  white-space: nowrap;
  transition: color .15s, background .15s;
}
.primary-nav a:hover,
.primary-nav a[aria-current="true"] {
  color: var(--cb-text);
  background: var(--cb-surface);
}

/* ── Hamburger toggle ── */
.nav-toggle {
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  color: var(--cb-text);
  border-radius: var(--border-radius);
  display: flex;
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform .25s, opacity .2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile drawer ── */
.nav-drawer,
.primary-nav {
  display: none;
}
.nav-drawer,
.primary-nav.is-open {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--cb-bg-alt);
  z-index: 199;
  padding: var(--space-6);
  overflow-y: auto;
  border-top: 1px solid var(--cb-border);
}
.nav-drawer.is-open,
.primary-nav.is-open { display: block; }
.nav-drawer ul,
.primary-nav.is-open ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.nav-drawer a,
.primary-nav.is-open a {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: 1rem;
  font-weight: 500;
  color: var(--cb-text-muted);
  text-decoration: none;
  border-radius: var(--border-radius);
  border: 1px solid var(--cb-border);
  transition: color .15s, border-color .15s, background .15s;
}
.nav-drawer a:hover,
.primary-nav.is-open a:hover { color: var(--cb-text); border-color: var(--cb-accent); background: var(--cb-accent-dim); }

/* ── Responsive: show desktop nav at 900px+ ── */
@media (min-width: 900px) {
  .nav-menu     { display: flex; }
  .nav-cta      { display: block !important; }
  .primary-nav  { display: block; }
  .nav-toggle   { display: none; }
}

/* ================================================================
   PAGE LAYOUT
   ================================================================ */

.page-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
}
/* Article pages wrap in .container then inner content */
main > .container {
  padding-top: var(--space-6);
  padding-bottom: var(--space-16);
}

/* ── Article layout with TOC sidebar ── */
.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: start;
}
@media (min-width: 1080px) {
  .article-layout {
    grid-template-columns: 1fr var(--toc-width);
  }
  .article-layout .article-body { order: 1; }
  .article-layout .toc-sidebar   { order: 2; }
}

/* ================================================================
   BREADCRUMBS
   ================================================================ */

.breadcrumb {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  color: var(--cb-text-muted);
  margin-bottom: var(--space-6);
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: 999px;
  padding: 5px 14px;
  max-width: 100%;
  overflow-x: auto;
}
.breadcrumb a {
  color: var(--cb-text-dim);
  text-decoration: none;
  transition: color .15s;
  white-space: nowrap;
}
.breadcrumb a:hover { color: var(--cb-link); }
.breadcrumb .sep {
  color: var(--cb-text-dim);
  margin: 0 7px;
  opacity: 0.5;
}
/* Breadcrumb as <ol> (article pages) */
.breadcrumb ol {
  list-style: none;
  display: flex;
  align-items: center;
}
.breadcrumb ol li {
  display: flex;
  align-items: center;
  white-space: nowrap;
}
.breadcrumb ol li + li::before {
  content: '›';
  color: var(--cb-text-dim);
  margin: 0 7px;
  opacity: 0.5;
}
.breadcrumb ol li a { color: var(--cb-text-dim); text-decoration: none; transition: color .15s; }
.breadcrumb ol li a:hover { color: var(--cb-link); }
.breadcrumb ol li[aria-current="page"] { color: var(--cb-text-muted); }

/* ================================================================
   ARTICLE HEADER
   ================================================================ */

.article-header { margin-bottom: var(--space-8); }

/* Category tag — .silo-tag (articles) and .article-eyebrow (pillar) */
.silo-tag,
.article-eyebrow {
  display: inline-flex;
  align-items: center;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cb-accent);
  background: var(--cb-accent-dim);
  border: 1px solid rgba(245,165,36,.2);
  padding: 3px 10px;
  border-radius: 999px;
  font-family: var(--font-mono);
  text-decoration: none;
}
.silo-tag a { color: inherit; text-decoration: none; }
.silo-tag:hover { background: var(--cb-accent-glow); }

/* Article meta row */
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: 0.8125rem;
  color: var(--cb-text-muted);
  align-items: center;
  margin-bottom: var(--space-4);
}
.article-meta time { color: var(--cb-text-dim); }

/* Article title */
.article-header h1,
.article-title {
  font-size: clamp(1.625rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.025em;
  color: var(--cb-text);
  margin-top: var(--space-3);
  margin-bottom: var(--space-4);
}

/* Article deck / lead — .article-deck (articles) and .article-lead (pillar) */
.article-deck,
.article-lead {
  font-size: 1.0625rem;
  color: var(--cb-text-muted);
  line-height: 1.65;
  max-width: 70ch;
  margin-bottom: var(--space-6);
  border-left: 3px solid var(--cb-accent);
  padding-left: var(--space-4);
}

/* ================================================================
   TABLE OF CONTENTS
   ================================================================ */

/* Sidebar TOC */
.toc-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-6));
  max-height: calc(100vh - var(--nav-height) - var(--space-12));
  overflow-y: auto;
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-4) var(--space-5);
}

/* TOC heading — .toc-title (articles) and .toc-box h2 (old) */
.toc-title,
.toc-sidebar > nav > p.toc-title,
.toc-box h2 {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cb-text-dim);
  font-family: var(--font-mono);
  margin-bottom: var(--space-3);
}

.toc-list { list-style: none; display: flex; flex-direction: column; gap: 1px; }
.toc-list a {
  display: block;
  font-size: 0.8125rem;
  color: var(--cb-text-muted);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 4px;
  border-left: 2px solid transparent;
  line-height: 1.4;
  transition: color .15s, border-color .15s, background .15s;
}
.toc-list a:hover { color: var(--cb-text); background: var(--cb-surface-2); }
.toc-list a.is-active {
  color: var(--cb-accent);
  border-left-color: var(--cb-accent);
  background: var(--cb-accent-dim);
}
.toc-list .toc-h3 { padding-left: var(--space-4); font-size: 0.75rem; }

/* Inline TOC — <details class="toc-inline"> */
.toc-inline {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-6);
  overflow: hidden;
}
.toc-inline summary {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--cb-text-muted);
  cursor: pointer;
  padding: var(--space-3) var(--space-4);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  user-select: none;
}
.toc-inline summary::before {
  content: '☰';
  font-size: 0.75rem;
  color: var(--cb-accent);
}
.toc-inline summary::-webkit-details-marker { display: none; }
.toc-inline nav {
  padding: 0 var(--space-4) var(--space-3);
  border-top: 1px solid var(--cb-border);
}
.toc-inline ol {
  list-style: decimal;
  padding-left: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: var(--space-2);
}
.toc-inline ol li { font-size: 0.875rem; }
.toc-inline ol li a { color: var(--cb-text-muted); text-decoration: none; }
.toc-inline ol li a:hover { color: var(--cb-link); }

@media (min-width: 1080px) {
  .toc-inline  { display: none; }
}
@media (max-width: 1079px) {
  .toc-sidebar { display: none; }
}

/* ================================================================
   ARTICLE BODY TYPOGRAPHY
   ================================================================ */

.article-body {
  min-width: 0;
  max-width: var(--content-width);
}
.article-body h2 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--cb-text);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--cb-border);
  scroll-margin-top: calc(var(--nav-height) + var(--space-4));
}
.article-body h2:first-child { margin-top: 0; border-top: none; padding-top: 0; }
.article-body h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--cb-text);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  scroll-margin-top: calc(var(--nav-height) + var(--space-4));
}
.article-body h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--cb-text);
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}
.article-body p { margin-bottom: var(--space-5); }
.article-body p:last-child { margin-bottom: 0; }
.article-body ul, .article-body ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.article-body li > ul, .article-body li > ol { margin-top: var(--space-2); margin-bottom: 0; }
.article-body strong { font-weight: 700; color: var(--cb-text); }
.article-body em { font-style: italic; }
.article-body blockquote {
  border-left: 3px solid var(--cb-accent);
  padding: var(--space-3) var(--space-5);
  background: var(--cb-surface);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  color: var(--cb-text-muted);
  margin: var(--space-6) 0;
  font-style: italic;
}
.article-body hr {
  border: none;
  border-top: 1px solid var(--cb-border);
  margin: var(--space-10) 0;
}
/* section spacing */
.article-body section + section { margin-top: 0; }
.article-body section { scroll-margin-top: calc(var(--nav-height) + var(--space-4)); }

/* ================================================================
   CODE
   ================================================================ */

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--cb-code-bg);
  border: 1px solid var(--cb-code-border);
  padding: 1px 5px;
  border-radius: 4px;
  color: #A8D8FF;
}
pre {
  background: var(--cb-code-bg);
  border: 1px solid var(--cb-code-border);
  border-radius: var(--border-radius);
  padding: var(--space-5) var(--space-6);
  overflow-x: auto;
  margin: var(--space-6) 0;
  position: relative;
}
pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  color: var(--cb-text);
  line-height: 1.65;
}
.code-block { margin: var(--space-6) 0; }
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--cb-surface-2);
  border: 1px solid var(--cb-code-border);
  border-bottom: none;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  padding: var(--space-2) var(--space-5);
}
.code-lang {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cb-text-dim);
}
.code-copy-btn {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--cb-text-muted);
  background: none;
  border: 1px solid var(--cb-border);
  border-radius: 4px;
  padding: 2px 8px;
  cursor: pointer;
  transition: color .15s, border-color .15s;
}
.code-copy-btn:hover { color: var(--cb-text); border-color: var(--cb-border-light); }
.code-block pre { margin: 0; border-top-left-radius: 0; border-top-right-radius: 0; }

/* Syntax highlighting */
.sh-kw  { color: #FF7B72; }
.sh-fn  { color: #D2A8FF; }
.sh-str { color: #A5D6FF; }
.sh-num { color: #79C0FF; }
.sh-cmt { color: #4E6278; font-style: italic; }
.sh-op  { color: #F0883E; }
.sh-typ { color: #FFA657; }
.sh-var { color: var(--cb-text); }

/* ================================================================
   TABLES
   ================================================================ */

.table-wrap { overflow-x: auto; margin: var(--space-6) 0; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  line-height: 1.5;
  margin: var(--space-6) 0;
}
caption {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cb-text-dim);
  font-family: var(--font-mono);
  text-align: left;
  margin-bottom: var(--space-2);
}
th {
  text-align: left;
  padding: 9px 14px;
  background: var(--cb-surface-2);
  border-bottom: 2px solid var(--cb-border-light);
  font-weight: 700;
  color: var(--cb-text);
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}
td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--cb-border);
  vertical-align: top;
  color: var(--cb-text);
}
tr:hover td { background: var(--cb-surface); }
.table-sortable th { cursor: pointer; user-select: none; }
.table-sortable th::after { content: ' ↕'; font-size: 0.65em; color: var(--cb-text-dim); }
.table-sortable th.sort-asc::after  { content: ' ↑'; color: var(--cb-accent); }
.table-sortable th.sort-desc::after { content: ' ↓'; color: var(--cb-accent); }

/* ================================================================
   INFO & CALLOUT BOXES
   ================================================================ */

/* Safety warning (machine-safety articles) */
.safety-warning {
  background: var(--cb-safety);
  border: 1px solid rgba(205,138,0,.35);
  border-left: 4px solid var(--cb-warning);
  border-radius: var(--border-radius);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-6) 0;
  font-size: 0.9375rem;
  color: var(--cb-text);
  line-height: 1.6;
}
.safety-warning strong { color: #F5C842; }

/* Generic callout / info */
.callout-info {
  background: rgba(77,159,255,.08);
  border: 1px solid rgba(77,159,255,.25);
  border-left: 4px solid var(--cb-link);
  border-radius: var(--border-radius);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-6) 0;
  font-size: 0.9375rem;
  color: var(--cb-text);
  line-height: 1.6;
}
.callout-info strong { color: var(--cb-link-hover); }

/* Generic info-box */
.info-box {
  display: flex;
  gap: var(--space-4);
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-6) 0;
}
.info-box__icon { font-size: 1.25rem; flex-shrink: 0; margin-top: 2px; }
.info-box__body { font-size: 0.9375rem; }
.info-box__body strong { display: block; margin-bottom: var(--space-1); }
.info-box--warning { border-color: var(--cb-warning); }
.info-box--warning .info-box__icon { color: var(--cb-warning); }
.info-box--danger  { border-color: var(--cb-danger); }
.info-box--danger  .info-box__icon { color: var(--cb-danger); }
.info-box--success { border-color: var(--cb-success); }
.info-box--success .info-box__icon { color: var(--cb-success); }

/* ================================================================
   KEY TAKEAWAYS
   ================================================================ */

.key-takeaways {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-left: 4px solid var(--cb-accent);
  border-radius: var(--border-radius);
  padding: var(--space-5) var(--space-6);
  margin: var(--space-8) 0;
}
.key-takeaways h2,
.kt-title {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cb-accent);
  font-family: var(--font-mono);
  margin-bottom: var(--space-3);
}
.key-takeaways ul,
.kt-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: 0;
}
.key-takeaways li,
.kt-list li {
  padding-left: var(--space-5);
  position: relative;
  font-size: 0.9375rem;
  color: var(--cb-text);
}
.key-takeaways li::before,
.kt-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--cb-accent);
  font-family: var(--font-mono);
}

/* ================================================================
   SOURCES BLOCK
   ================================================================ */

.sources-block {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--cb-border);
}
.sources-block h2 {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cb-text-dim);
  font-family: var(--font-mono);
  margin-bottom: var(--space-4);
}
.sources-block ul,
.sources-block ol {
  padding-left: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.sources-block li { font-size: 0.8125rem; color: var(--cb-text-muted); }
.sources-block a { color: var(--cb-text-muted); word-break: break-all; }

/* ================================================================
   FAQ LIST  (dl/dt/dd pattern)
   ================================================================ */

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: var(--space-6) 0;
}
.faq-list dt {
  font-size: 1rem;
  font-weight: 700;
  color: var(--cb-text);
  padding: var(--space-5) 0 var(--space-3);
  border-top: 1px solid var(--cb-border);
}
.faq-list dt:first-child { border-top: none; padding-top: 0; }
.faq-list dd {
  font-size: 0.9375rem;
  color: var(--cb-text-muted);
  line-height: 1.65;
  padding-left: var(--space-4);
  padding-bottom: var(--space-4);
  border-left: 2px solid var(--cb-border);
  margin-left: 0;
}

/* ================================================================
   ARTICLE NAVIGATION (prev / next)
   ================================================================ */

.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--cb-border);
}
.article-nav-prev,
.article-nav-next {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-4);
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: border-color .2s, background .2s;
}
.article-nav-prev:hover,
.article-nav-next:hover {
  border-color: var(--cb-accent);
  background: var(--cb-surface-2);
}
.article-nav-next { text-align: right; }
.nav-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cb-text-dim);
  font-family: var(--font-mono);
}
.nav-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--cb-link);
  line-height: 1.35;
}
.article-nav-prev .nav-label::before { content: '← '; }
.article-nav-next .nav-label::after  { content: ' →'; }

@media (max-width: 600px) {
  .article-nav { grid-template-columns: 1fr; }
  .article-nav-next { text-align: left; }
}

/* ================================================================
   RELATED ARTICLES
   ================================================================ */

.related-articles {
  margin-top: var(--space-10);
  padding: var(--space-6);
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
}
.related-articles h2 {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cb-text-dim);
  font-family: var(--font-mono);
  margin-bottom: var(--space-4);
}
.related-articles ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); padding: 0; margin: 0; }
.related-articles a {
  color: var(--cb-link);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.related-articles a::before { content: '→'; color: var(--cb-accent); font-family: var(--font-mono); }
.related-articles a:hover { color: var(--cb-link-hover); }

/* ================================================================
   SILO / PILLAR CARD GRID
   ================================================================ */

.silo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(272px, 1fr));
  gap: var(--space-4);
  margin: var(--space-8) 0;
}
.silo-card {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-5) var(--space-6);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: border-color .2s, background .2s, box-shadow .2s;
  position: relative;
  overflow: hidden;
}
.silo-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(245,165,36,.04) 0%, transparent 60%);
  opacity: 0;
  transition: opacity .2s;
}
.silo-card:hover {
  border-color: var(--cb-accent);
  background: var(--cb-surface-2);
  box-shadow: 0 0 0 1px rgba(245,165,36,.15), var(--cb-shadow-sm);
}
.silo-card:hover::before { opacity: 1; }
.silo-card__icon {
  width: 44px;
  height: 44px;
  background: var(--cb-accent-dim);
  border: 1px solid rgba(245,165,36,.2);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
}
.silo-card__icon svg { width: 22px; height: 22px; color: var(--cb-accent); }
.silo-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--cb-text);
  line-height: 1.3;
}
.silo-card__desc {
  font-size: 0.875rem;
  color: var(--cb-text-muted);
  line-height: 1.55;
  flex: 1;
}
.silo-card__arrow {
  font-size: 0.8125rem;
  color: var(--cb-accent);
  font-family: var(--font-mono);
  margin-top: auto;
}

/* ================================================================
   CALCULATOR / TOOL LAYOUT
   ================================================================ */

.calc-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}
@media (min-width: 800px) {
  .calc-layout { grid-template-columns: 380px 1fr; align-items: start; }
}
.calc-panel {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
}
.calc-panel h2 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: var(--space-5);
  color: var(--cb-text);
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.form-label { font-size: 0.875rem; font-weight: 600; color: var(--cb-text); }
.form-hint  { font-size: 0.75rem; color: var(--cb-text-muted); }
.form-input, .form-select {
  background: var(--cb-bg);
  border: 1px solid var(--cb-border-light);
  border-radius: var(--border-radius);
  padding: var(--space-2) var(--space-3);
  color: var(--cb-text);
  font-size: 0.9375rem;
  transition: border-color .15s;
  width: 100%;
}
.form-input:focus, .form-select:focus { outline: none; border-color: var(--cb-accent); }
.form-input::placeholder { color: var(--cb-text-dim); }
.btn-calc {
  width: 100%;
  background: var(--cb-accent);
  color: #000;
  border: none;
  border-radius: var(--border-radius);
  padding: var(--space-3) var(--space-4);
  font-size: 0.9375rem;
  font-weight: 700;
  cursor: pointer;
  margin-top: var(--space-2);
  transition: background .15s;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.btn-calc:hover { background: var(--cb-accent-hover); }
.calc-result {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
}
.calc-result__val {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--cb-accent);
  margin-bottom: var(--space-2);
}
.calc-result__label { font-size: 0.875rem; color: var(--cb-text-muted); margin-bottom: var(--space-5); }
.calc-result__breakdown {
  border-top: 1px solid var(--cb-border);
  padding-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.calc-result-row { display: flex; justify-content: space-between; font-size: 0.875rem; }
.calc-result-row dt { color: var(--cb-text-muted); }
.calc-result-row dd { color: var(--cb-text); font-family: var(--font-mono); font-weight: 600; }

/* ================================================================
   FIGURES & IMAGES
   ================================================================ */

figure { margin: var(--space-8) 0; }
figure img, figure svg {
  border-radius: var(--border-radius);
  border: 1px solid var(--cb-border);
  max-width: 100%;
}
figcaption {
  margin-top: var(--space-2);
  font-size: 0.8125rem;
  color: var(--cb-text-muted);
  text-align: center;
  font-style: italic;
}

/* ================================================================
   HERO SECTION (homepage)
   ================================================================ */

.hero {
  position: relative;
  overflow: hidden;
  padding: var(--space-16) 0 var(--space-12);
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(245,165,36,.07) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(77,159,255,.05) 0%, transparent 60%),
    var(--cb-bg);
}

/* Circuit board grid texture */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(30,46,69,.6) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,46,69,.6) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black 30%, transparent 80%);
  pointer-events: none;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--cb-accent);
  font-family: var(--font-mono);
  margin-bottom: var(--space-5);
  padding: 5px 14px;
  background: var(--cb-accent-dim);
  border: 1px solid rgba(245,165,36,.25);
  border-radius: 999px;
}
.hero__eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--cb-accent);
  border-radius: 50%;
  animation: blink 1.6s ease-in-out infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.2} }

.hero__title {
  font-size: clamp(2.25rem, 6vw, 3.75rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: var(--cb-text);
  max-width: 18ch;
  margin: 0 auto var(--space-5);
}
.hero__title em { color: var(--cb-accent); font-style: normal; }
.hero__sub {
  font-size: 1.125rem;
  color: var(--cb-text-muted);
  max-width: 52ch;
  margin: 0 auto var(--space-8);
  line-height: 1.65;
}
.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-bottom: var(--space-10);
}
.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--cb-accent);
  color: #000;
  font-size: 0.9375rem;
  font-weight: 700;
  padding: 11px 22px;
  border-radius: var(--border-radius);
  text-decoration: none;
  transition: background .15s;
  font-family: var(--font-mono);
}
.hero__cta:hover { background: var(--cb-accent-hover); color: #000; }
.hero__cta--outline {
  background: transparent;
  color: var(--cb-text-muted);
  border: 1px solid var(--cb-border-light);
}
.hero__cta--outline:hover {
  background: var(--cb-surface);
  color: var(--cb-text);
  border-color: var(--cb-accent);
}

/* Stats bar */
.hero__stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-8);
  padding: var(--space-6) 0;
  border-top: 1px solid var(--cb-border);
  border-bottom: 1px solid var(--cb-border);
  margin-top: var(--space-4);
}
.hero__stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.hero__stat-num {
  font-family: var(--font-mono);
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--cb-accent);
  line-height: 1;
}
.hero__stat-label {
  font-size: 0.75rem;
  color: var(--cb-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ================================================================
   SECTION HEADINGS (homepage sections)
   ================================================================ */

.section-heading {
  font-size: 1.625rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--cb-text);
  margin-bottom: var(--space-3);
}
.section-eyebrow {
  display: block;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--cb-accent);
  font-family: var(--font-mono);
  margin-bottom: var(--space-2);
}
.section-sub {
  font-size: 0.9375rem;
  color: var(--cb-text-muted);
  margin-bottom: var(--space-8);
  max-width: 56ch;
  line-height: 1.6;
}

/* ================================================================
   FEATURE / VALUE PROP CARDS
   ================================================================ */

.value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-5);
}
.value-card {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
}
.value-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius);
  background: var(--cb-accent-dim);
  border: 1px solid rgba(245,165,36,.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}
.value-card__icon svg { width: 20px; height: 20px; color: var(--cb-accent); }
.value-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--cb-text);
  margin-bottom: var(--space-2);
}
.value-card__desc { font-size: 0.875rem; color: var(--cb-text-muted); line-height: 1.6; }

/* ================================================================
   FEATURED ARTICLE CARDS
   ================================================================ */

.article-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-5);
}
.article-card {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  text-decoration: none;
  transition: border-color .2s, background .2s;
}
.article-card:hover {
  border-color: var(--cb-link);
  background: var(--cb-surface-2);
}
.article-card__tag {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cb-accent);
}
.article-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--cb-text);
  line-height: 1.35;
}
.article-card__desc {
  font-size: 0.875rem;
  color: var(--cb-text-muted);
  line-height: 1.55;
  flex: 1;
}
.article-card__arrow {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--cb-link);
}

/* ================================================================
   PILLAR PAGE
   ================================================================ */

.pillar-hero {
  background:
    radial-gradient(ellipse 100% 60% at 50% -20%, rgba(245,165,36,.06) 0%, transparent 60%),
    var(--cb-bg-alt);
  border-bottom: 1px solid var(--cb-border);
  padding: var(--space-12) 0 var(--space-10);
}
.pillar-hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}
.pillar-hero h1 {
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin-bottom: var(--space-4);
}
.pillar-hero-lead {
  font-size: 1.0625rem;
  color: var(--cb-text-muted);
  max-width: 60ch;
  line-height: 1.65;
}

/* Child article list */
.child-articles { display: flex; flex-direction: column; gap: 0; }
.child-article {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--cb-border);
  text-decoration: none;
  transition: background .15s;
}
.child-article:hover .child-article__title { color: var(--cb-link-hover); }
.child-article__title { font-size: 0.9375rem; font-weight: 600; color: var(--cb-link); margin-bottom: var(--space-1); transition: color .15s; }
.child-article__desc { font-size: 0.8125rem; color: var(--cb-text-muted); line-height: 1.4; }
.child-article__arrow { color: var(--cb-text-dim); font-family: var(--font-mono); font-size: 0.875rem; flex-shrink: 0; }

/* Pillar section heading */
.pillar-section-heading {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cb-text-dim);
  font-family: var(--font-mono);
  margin: var(--space-8) 0 var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.pillar-section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--cb-border);
}

/* Pillar child article cards */
.pillar-child-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}
.pillar-child-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-left: 3px solid rgba(77,159,255,.4);
  border-radius: var(--border-radius-lg);
  text-decoration: none;
  transition: border-color .2s, background .2s, box-shadow .2s, border-left-color .2s;
}
.pillar-child-link:hover {
  background: var(--cb-surface-2);
  border-color: var(--cb-link);
  border-left-color: var(--cb-link);
  box-shadow: var(--cb-shadow-sm);
}
.pillar-child-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--cb-link);
  line-height: 1.4;
}
.pillar-child-link:hover .pillar-child-title { color: var(--cb-link-hover); }
.pillar-child-desc {
  font-size: 0.8125rem;
  color: var(--cb-text-muted);
  line-height: 1.55;
}

/* ================================================================
   PROSE — pillar page body content
   ================================================================ */

.prose {
  max-width: var(--content-width);
  padding-top: var(--space-8);
  border-top: 1px solid var(--cb-border);
}
.prose h2 {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--cb-text);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--cb-border);
  scroll-margin-top: calc(var(--nav-height) + var(--space-4));
}
.prose h2:first-child { margin-top: 0; border-top: none; padding-top: 0; }
.prose h3 {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--cb-text);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  scroll-margin-top: calc(var(--nav-height) + var(--space-4));
}
.prose h4 {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--cb-text);
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}
.prose p {
  margin-bottom: var(--space-5);
  color: var(--cb-text);
  line-height: 1.72;
}
.prose p:last-child { margin-bottom: 0; }
.prose ul, .prose ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.prose li { color: var(--cb-text); line-height: 1.65; }
.prose strong { font-weight: 600; color: var(--cb-text); }
.prose em { font-style: italic; }
.prose figure { margin: var(--space-8) 0; }
.prose .diagram-wrap { margin: var(--space-8) 0; }

/* ================================================================
   GLOSSARY
   ================================================================ */

.glossary-index {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}
.glossary-index a {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--cb-text-muted);
  text-decoration: none;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius);
  transition: border-color .15s, color .15s;
}
.glossary-index a:hover { color: var(--cb-accent); border-color: var(--cb-accent); }
.glossary-section { margin-bottom: var(--space-10); }
.glossary-letter {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cb-accent);
  border-bottom: 1px solid var(--cb-border);
  padding-bottom: var(--space-2);
  margin-bottom: var(--space-4);
  scroll-margin-top: calc(var(--nav-height) + var(--space-4));
}
.glossary-term { margin-bottom: var(--space-5); }
.glossary-term dt {
  font-size: 1rem;
  font-weight: 700;
  color: var(--cb-text);
  font-family: var(--font-mono);
  margin-bottom: var(--space-1);
  scroll-margin-top: calc(var(--nav-height) + var(--space-4));
}
.glossary-term dd {
  font-size: 0.9375rem;
  color: var(--cb-text-muted);
  padding-left: var(--space-4);
  border-left: 2px solid var(--cb-border);
}
/* also support simple dl structure in glossary */
.glossary-list dt { font-size:1rem; font-weight:700; color:var(--cb-text); font-family:var(--font-mono); margin-bottom:var(--space-1); scroll-margin-top:calc(var(--nav-height) + var(--space-4)); }
.glossary-list dd { font-size:.9375rem; color:var(--cb-text-muted); padding-left:var(--space-4); border-left:2px solid var(--cb-border); margin-bottom:var(--space-5); }

/* ================================================================
   SITE FOOTER
   ================================================================ */

.site-footer {
  background: var(--cb-bg-alt);
  border-top: 1px solid var(--cb-border);
  margin-top: var(--space-16);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-10) var(--space-6) var(--space-8);
}
/* article footer pattern: .container.footer-inner */
.site-footer .container.footer-inner,
.site-footer .container {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}
.footer-brand { grid-column: 1 / -1; }
@media (min-width: 700px) { .footer-brand { grid-column: auto; } }
.footer-logo-text {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--cb-text);
  display: inline-block;
  margin-bottom: var(--space-3);
}
.footer-logo-text span { color: var(--cb-accent); }
.footer-tagline {
  font-size: 0.8125rem;
  color: var(--cb-text-muted);
  line-height: 1.6;
  max-width: 28ch;
}
.footer-col h3 {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cb-text-dim);
  font-family: var(--font-mono);
  margin-bottom: var(--space-3);
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col a { font-size: 0.875rem; color: var(--cb-text-muted); text-decoration: none; transition: color .15s; }
.footer-col a:hover { color: var(--cb-link); }
.footer-bottom {
  border-top: 1px solid var(--cb-border);
  padding-top: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
}
.footer-copy { font-size: 0.8125rem; color: var(--cb-text-dim); }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-4); list-style: none; }
.footer-links a { font-size: 0.8125rem; color: var(--cb-text-dim); text-decoration: none; transition: color .15s; }
.footer-links a:hover { color: var(--cb-text-muted); }

/* simple footer nav (article pages) */
.site-footer nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.site-footer nav a {
  font-size: 0.8125rem;
  color: var(--cb-text-dim);
  text-decoration: none;
  transition: color .15s;
}
.site-footer nav a:hover { color: var(--cb-text-muted); }

/* ================================================================
   PAGINATION
   ================================================================ */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-10);
}
.pagination a {
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius);
  color: var(--cb-text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: border-color .15s, color .15s;
}
.pagination a:hover { border-color: var(--cb-accent); color: var(--cb-text); }
.pagination .current {
  padding: var(--space-2) var(--space-4);
  background: var(--cb-accent);
  color: #000;
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  font-weight: 700;
}

/* ================================================================
   INDUSTRIAL DIAGRAM / SVG ILLUSTRATIONS
   ================================================================ */

.diagram-wrap {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
  margin: var(--space-8) 0;
  overflow-x: auto;
}
.diagram-wrap svg { max-width: 100%; }
.diagram-caption {
  font-size: 0.8125rem;
  color: var(--cb-text-muted);
  text-align: center;
  margin-top: var(--space-3);
  font-style: italic;
}

/* ================================================================
   UTILITY
   ================================================================ */

.sr-only, .visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}
.text-mono   { font-family: var(--font-mono); }
.text-accent { color: var(--cb-accent); }
.text-muted  { color: var(--cb-text-muted); }
.text-center { text-align: center; }
.mt-0 { margin-top: 0 !important; }

/* ================================================================
   HERO LAYOUT (2-column with diagram on desktop)
   ================================================================ */

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-10);
}
.hero__content { max-width: 620px; }
.hero__diagram {
  display: none;
  flex-shrink: 0;
  width: 440px;
  opacity: 0.75;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-bottom: var(--space-8);
}
@media (min-width: 960px) {
  .hero__inner {
    flex-direction: row;
    text-align: left;
    align-items: center;
  }
  .hero__content { flex: 1; }
  .hero__diagram { display: block; }
  .hero__actions { justify-content: flex-start; }
  .hero__title  { margin-left: 0; }
  .hero__sub    { margin-left: 0; }
}

/* Stats bar — aliases for both naming conventions */
.hero__stat       { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.hero__stat-value { font-family: var(--font-mono); font-size: 1.625rem; font-weight: 700; color: var(--cb-accent); line-height: 1; }

/* ================================================================
   SILO CARD EXTRAS
   ================================================================ */

.silo-card__count {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cb-text-dim);
}
.silo-card--accent {
  border-color: rgba(245,165,36,.4);
  background: linear-gradient(135deg, rgba(245,165,36,.06) 0%, var(--cb-surface) 60%);
}
.silo-card--accent:hover { border-color: var(--cb-accent); }
.silo-card--accent .silo-card__icon { background: rgba(245,165,36,.15); }

/* ================================================================
   HOME PAGE SECTIONS
   ================================================================ */

.home-section {
  margin-top: var(--space-16);
}
.home-section__header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.home-section__title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--cb-text);
  margin: 0;
}
.home-section__link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--cb-accent);
  text-decoration: none;
  white-space: nowrap;
}
.home-section__link:hover { color: var(--cb-accent-hover); }
.home-section__footer {
  text-align: center;
  margin-top: var(--space-8);
}

/* ================================================================
   ARTICLE CARDS — additional class aliases + diagram variant
   ================================================================ */

/* .article-card__silo = alias for .article-card__tag */
.article-card__silo {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cb-accent);
}
/* .article-card__read = alias for .article-card__arrow */
.article-card__read {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--cb-link);
  margin-top: auto;
}
/* Embedded SVG diagram area in article cards */
.article-card__diagram {
  border-radius: var(--border-radius);
  background: var(--cb-surface-3);
  border: 1px solid var(--cb-border);
  overflow: hidden;
  flex-shrink: 0;
}
.article-card__diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ================================================================
   SECONDARY BUTTON
   ================================================================ */

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--cb-text-muted);
  text-decoration: none;
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius);
  padding: 9px 18px;
  transition: color .15s, border-color .15s, background .15s;
}
.btn-secondary:hover {
  color: var(--cb-text);
  border-color: var(--cb-accent);
  background: var(--cb-accent-dim);
}

/* ================================================================
   HOW IT WORKS — 3-STEP SECTION
   ================================================================ */

.how-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-top: var(--space-6);
}
.how-step {
  position: relative;
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
}
.how-step__num {
  position: absolute;
  top: var(--space-5);
  right: var(--space-5);
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--cb-surface-3);
  line-height: 1;
  pointer-events: none;
}
.how-step__icon {
  width: 44px;
  height: 44px;
  background: var(--cb-accent-dim);
  border: 1px solid rgba(245,165,36,.2);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}
.how-step__icon svg {
  width: 22px;
  height: 22px;
  color: var(--cb-accent);
}
.how-step__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--cb-text);
  margin-bottom: var(--space-2);
}
.how-step__desc {
  font-size: 0.875rem;
  color: var(--cb-text-muted);
  line-height: 1.65;
}
.how-step__desc a { color: var(--cb-link); }

/* ================================================================
   TOOLS CALLOUT SECTION
   ================================================================ */

.tools-callout {
  margin-top: var(--space-16);
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  position: relative;
}
.tools-callout::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 60% at 0% 50%, rgba(245,165,36,.06) 0%, transparent 60%);
  pointer-events: none;
}
.tools-callout__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  padding: var(--space-10) var(--space-8);
  align-items: center;
}
@media (min-width: 800px) {
  .tools-callout__inner { grid-template-columns: 1fr 320px; }
}
.tools-callout__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--cb-accent);
  display: block;
  margin-bottom: var(--space-3);
}
.tools-callout__title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--cb-text);
  margin-bottom: var(--space-3);
  line-height: 1.25;
}
.tools-callout__desc {
  font-size: 0.9375rem;
  color: var(--cb-text-muted);
  margin-bottom: var(--space-6);
  line-height: 1.65;
  max-width: 48ch;
}
.tools-callout__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.tools-callout__tool {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--cb-surface-2);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--cb-text);
  transition: border-color .2s, background .2s;
}
.tools-callout__tool svg {
  width: 18px;
  height: 18px;
  color: var(--cb-accent);
  flex-shrink: 0;
}
.tools-callout__tool:hover {
  border-color: var(--cb-accent);
  background: var(--cb-surface-3);
  color: var(--cb-text);
}
.tools-callout__illustration {
  display: none;
}
@media (min-width: 800px) {
  .tools-callout__illustration { display: block; }
}
.tools-callout__illustration svg {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
  border: 1px solid var(--cb-border);
}

/* ================================================================
   HEADING WEIGHTS — max 500 sitewide
   ================================================================ */

h1 { font-weight: 700; }
h2, h3, h4, h5, h6 { font-weight: 500; }

/* Override all specific heading rules */
.hero__title,
.article-header h1,
.article-title,
.pillar-hero h1 { font-weight: 700; }

.article-body h2,
.article-body h3,
.article-body h4,
.pillar-hero h2,
.section-heading,
.silo-card__title,
.value-card__title,
.article-card__title,
.how-step__title,
.home-section__title,
.tools-callout__title,
.calc-panel h2,
.related-articles h2,
.sources-block h2,
.key-takeaways h2,
.kt-title,
.toc-title,
.prose h2,
.prose h3,
.prose h4,
.pillar-hero-lead + h2,
.child-article__title,
.glossary-term dt { font-weight: 500; }

/* ================================================================
   PRODUCT GRID (pillar pages)
   ================================================================ */

.product-section-heading {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cb-text-dim);
  font-family: var(--font-mono);
  margin: var(--space-10) 0 var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.product-section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--cb-border);
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}
@media (min-width: 600px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .product-grid { grid-template-columns: repeat(4, 1fr); }
}

.product-card {
  display: flex;
  flex-direction: column;
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  text-decoration: none;
  transition: border-color .2s, box-shadow .2s, transform .2s;
}
.product-card:hover {
  border-color: var(--cb-accent);
  box-shadow: 0 8px 28px rgba(0,0,0,.4);
  transform: translateY(-2px);
}

.product-card__img {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--cb-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--cb-border);
}
.product-card__img img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: var(--space-4);
}
.product-card__img svg {
  width: 80%;
  height: auto;
}

.product-card__body {
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex: 1;
}
.product-card__brand {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--cb-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.product-card__name {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--cb-text);
  line-height: 1.35;
}
.product-card__tagline {
  font-size: 0.8125rem;
  color: var(--cb-text-muted);
  line-height: 1.5;
  flex: 1;
}
.product-card__cta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cb-link);
  margin-top: var(--space-2);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ================================================================
   PRODUCT PAGE LAYOUT
   ================================================================ */

.product-hero {
  background: var(--cb-bg-alt);
  border-bottom: 1px solid var(--cb-border);
  padding: var(--space-10) 0 var(--space-12);
}
.product-hero__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
}
@media (min-width: 860px) {
  .product-hero__inner { grid-template-columns: 1fr 380px; }
}

.product-hero__content { display: flex; flex-direction: column; gap: var(--space-4); }

.product-hero__brand {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--cb-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.product-hero__name {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 500;
  line-height: 1.15;
  color: var(--cb-text);
}
.product-hero__tagline {
  font-size: 1.0625rem;
  color: var(--cb-text-muted);
  line-height: 1.65;
  max-width: 540px;
}
.product-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}
.product-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: rgba(77,159,255,.1);
  color: var(--cb-link);
  border: 1px solid rgba(77,159,255,.25);
  border-radius: 999px;
  padding: 3px 10px;
}

.product-hero__visual {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-xl);
  padding: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 240px;
}
.product-hero__visual svg,
.product-hero__visual img {
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: contain;
  border-radius: var(--border-radius);
}

/* Quick-spec bar */
.product-spec-bar {
  background: var(--cb-surface);
  border-bottom: 1px solid var(--cb-border);
}
.product-spec-bar__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}
.product-spec-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.product-spec-item__label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cb-text-dim);
}
.product-spec-item__value {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--cb-text);
}

/* Product page body */
.product-body {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-10) var(--space-6);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
}
@media (min-width: 1000px) {
  .product-body { grid-template-columns: 1fr 280px; gap: var(--space-12); }
}

.product-main { min-width: 0; }
.product-sidebar { display: flex; flex-direction: column; gap: var(--space-6); }

/* Specs table */
.specs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  margin-bottom: var(--space-8);
}
.specs-table caption {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cb-text-dim);
  text-align: left;
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--cb-border);
}
.specs-table th {
  text-align: left;
  font-weight: 500;
  color: var(--cb-text-muted);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--cb-border);
  background: var(--cb-surface);
  width: 40%;
}
.specs-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid rgba(255,255,255,.04);
  color: var(--cb-text);
}
.specs-table tr:last-child th,
.specs-table tr:last-child td { border-bottom: none; }
.specs-table tr:hover td { background: rgba(255,255,255,.02); }

/* Feature list */
.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.feature-list__item {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: var(--space-3);
  align-items: start;
}
.feature-list__icon {
  width: 20px;
  height: 20px;
  background: rgba(245,165,36,.12);
  border: 1px solid rgba(245,165,36,.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.feature-list__icon svg { width: 10px; height: 10px; }
.feature-list__title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--cb-text);
  margin-bottom: 2px;
}
.feature-list__desc {
  font-size: 0.8125rem;
  color: var(--cb-text-muted);
  line-height: 1.6;
}

/* Sidebar widgets */
.product-sidebar-card {
  background: var(--cb-surface);
  border: 1px solid var(--cb-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-5);
}
.product-sidebar-card h3 {
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cb-text-dim);
  font-family: var(--font-mono);
  margin-bottom: var(--space-4);
}
.product-sidebar-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.product-sidebar-card ul li {
  font-size: 0.875rem;
  color: var(--cb-text-muted);
  display: flex;
  gap: var(--space-2);
  align-items: baseline;
}
.product-sidebar-card ul li::before {
  content: '›';
  color: var(--cb-accent);
  flex-shrink: 0;
}
.product-sidebar-card a { color: var(--cb-link); }

.product-alt-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--cb-border);
  text-decoration: none;
  font-size: 0.875rem;
  color: var(--cb-text-muted);
  transition: color .15s;
}
.product-alt-link:last-child { border-bottom: none; }
.product-alt-link:hover { color: var(--cb-text); }
.product-alt-link__arrow { color: var(--cb-link); }

/* ================================================================
   PRINT
   ================================================================ */

@media print {
  .site-header, .toc-sidebar, .toc-inline, .nav-drawer, .article-nav { display: none; }
  body { background: #fff; color: #000; }
  a { color: #000; }
  pre, code { background: #f5f5f5; border-color: #ccc; color: #000; }
  .article-deck, .article-lead { border-left-color: #000; }
}