:root {
  --primary: #1e3a8a;
  --primary-dark: #1e40af;
  --primary-50: #eef2ff;
  --accent: #06b6d4;
  --accent-50: #ecfeff;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --muted-2: #64748b;
  --border: #e2e8f0;
  --shadow: 0 1px 2px rgba(15,23,42,.04), 0 4px 12px rgba(15,23,42,.04);
  --shadow-h: 0 4px 12px rgba(15,23,42,.10), 0 12px 32px rgba(15,23,42,.06);
  --radius: 12px;
  --radius-sm: 8px;
  --container: 1100px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--primary-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.topnav { background: var(--card); border-bottom: 1px solid var(--border); padding: 14px 0; position: sticky; top: 0; z-index: 30; backdrop-filter: saturate(180%) blur(10px); background: rgba(255,255,255,.92); }
.topnav .container { display: flex; align-items: center; gap: 24px; }
.brand { font-weight: 700; font-size: 16px; color: var(--text); display: inline-flex; align-items: center; gap: 8px; }
.brand .brand-dot { width: 10px; height: 10px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--accent)); }
.brand:hover { text-decoration: none; }
.brand small { color: var(--muted-2); font-weight: 500; font-size: 12px; }
.topnav-links { margin-left: auto; display: flex; gap: 18px; align-items: center; }
.topnav-links a { color: var(--muted); font-size: 14px; font-weight: 500; }
.topnav-links a:hover { color: var(--primary-dark); text-decoration: none; }
.topnav-cta { background: var(--primary); color: #fff !important; padding: 8px 16px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 600; transition: background .15s; }
.topnav-cta:hover { background: var(--primary-dark); text-decoration: none !important; }
.hero { padding: 72px 0 40px; background: radial-gradient(ellipse 60% 40% at 30% 0%, var(--accent-50), transparent 60%), radial-gradient(ellipse 60% 40% at 80% 0%, var(--primary-50), transparent 60%), var(--bg); }
.hero-badge { display: inline-block; padding: 6px 14px; background: var(--accent-50); color: var(--primary); border: 1px solid var(--accent); border-radius: 999px; font-size: 13px; font-weight: 600; margin-bottom: 18px; opacity: .9; }
.hero h1 { font-size: 44px; line-height: 1.1; font-weight: 800; margin: 0 0 16px; letter-spacing: -.02em; }
.hero h1 .accent { background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero p.lede { font-size: 18px; color: var(--muted); max-width: 720px; margin: 0 0 24px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.cta-button { display: inline-block; padding: 12px 22px; border-radius: var(--radius-sm); font-weight: 600; font-size: 15px; transition: transform .1s, box-shadow .15s; border: 1px solid transparent; }
.cta-button.primary { background: var(--primary); color: #fff; }
.cta-button.primary:hover { background: var(--primary-dark); text-decoration: none; box-shadow: 0 4px 14px rgba(0,0,0,.15); }
.cta-button.secondary { background: #fff; color: var(--primary); border-color: var(--border); }
.cta-button.secondary:hover { border-color: var(--primary); text-decoration: none; }
.tldr { background: var(--card); border: 1px solid var(--border); border-left: 4px solid var(--accent); border-radius: var(--radius); padding: 22px 26px; margin: 32px 0; box-shadow: var(--shadow); }
.tldr h2 { font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--muted-2); margin: 0 0 10px; font-weight: 700; }
.tldr p { margin: 0 0 8px; font-size: 16px; }
.tldr p:last-child { margin: 0; }
.section { margin: 32px 0; }
.section h2 { font-size: 22px; margin: 0 0 14px; letter-spacing: -.01em; }
.section h3 { font-size: 16px; margin: 18px 0 6px; }
.page-content { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 36px; margin: 28px 0; box-shadow: var(--shadow); }
.page-content h1 { font-size: 30px; margin: 0 0 8px; letter-spacing: -.01em; }
.page-content h2 { font-size: 21px; margin: 28px 0 10px; }
.page-content h3 { font-size: 17px; margin: 20px 0 8px; }
.page-content p { font-size: 16px; line-height: 1.65; color: var(--text); }
.page-content ul, .page-content ol { font-size: 16px; line-height: 1.65; }
.page-content li { margin-bottom: 6px; }
.page-content table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
.page-content th, .page-content td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.page-content th { font-weight: 600; color: var(--muted-2); background: var(--bg); }
blockquote.canonical { margin: 14px 0; padding: 12px 14px; background: var(--accent-50); border-left: 3px solid var(--accent); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-size: 14px; }
blockquote.canonical p { margin: 0 0 6px; font-style: italic; line-height: 1.55; }
blockquote.canonical footer { font-size: 12.5px; font-style: normal; color: var(--muted); }
blockquote.canonical footer a { color: var(--primary-dark); font-weight: 500; }
blockquote.canonical .accessed { color: var(--muted-2); margin-left: 6px; font-size: 11.5px; }
.bibliography { margin-top: 14px; font-size: 14px; }
.bibliography li { margin-bottom: 10px; }
.bibliography .biblio-meta { color: var(--muted-2); font-size: 13px; }
.flag { display: inline-block; font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 999px; margin-left: 6px; vertical-align: middle; letter-spacing: .02em; white-space: nowrap; }
.flag-evergreen { background: #dcfce7; color: #166534; border: 1px solid #86efac; }
.flag-in-force { background: #dbeafe; color: #1e40af; border: 1px solid #93c5fd; }
.flag-emerging { background: #fef3c7; color: #92400e; border: 1px solid #fcd34d; }
.flag-counter-claim { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.page-meta { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 13px; color: var(--muted-2); }
.satellite-footer { background: #0f172a; color: #cbd5e1; padding: 48px 0 28px; margin-top: 56px; }
.satellite-footer .container { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; }
.satellite-footer h4 { color: #fff; font-size: 14px; margin: 0 0 12px; font-weight: 600; }
.satellite-footer ul { list-style: none; padding: 0; margin: 0; font-size: 14px; }
.satellite-footer li { margin-bottom: 8px; }
.satellite-footer a { color: #94a3b8; }
.satellite-footer a:hover { color: var(--accent); text-decoration: none; }
.satellite-footer .built-by { margin-top: 24px; padding-top: 24px; border-top: 1px solid #1e293b; font-size: 13px; color: #64748b; grid-column: 1 / -1; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* mechanic: glossary */
.brand-sub { color: var(--muted-2); font-weight: 500; font-size: 12px; }
.controls { margin: 24px 0 16px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); position: sticky; top: 60px; z-index: 20; backdrop-filter: saturate(180%) blur(10px); background: rgba(255,255,255,.96); }
.search-row { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; }
#search-input, .search-input { flex: 1; padding: 11px 14px; font-size: 15px; font-family: var(--font); border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg); color: var(--text); outline: none; transition: border-color .15s, box-shadow .15s; }
#search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(6,182,212,.18); }
#result-count { font-size: 13px; color: var(--muted-2); white-space: nowrap; font-variant-numeric: tabular-nums; }
.cat-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.cat-tab { background: var(--bg); color: var(--muted); border: 1px solid var(--border); padding: 6px 12px; border-radius: 999px; font-size: 13px; cursor: pointer; font-family: var(--font); transition: all .15s; display: inline-flex; align-items: center; gap: 6px; }
.cat-tab:hover { border-color: var(--primary); color: var(--primary); }
.cat-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.cat-count { background: rgba(255,255,255,.18); color: inherit; padding: 1px 7px; border-radius: 999px; font-size: 11px; font-weight: 600; font-variant-numeric: tabular-nums; }
.cat-tab:not(.active) .cat-count { background: var(--card); color: var(--muted-2); border: 1px solid var(--border); }

/* A–Z jump nav */
.az-nav { display: flex; flex-wrap: wrap; gap: 4px; padding-top: 8px; border-top: 1px dashed var(--border); }
.az-btn { background: var(--bg); color: var(--muted); border: 1px solid var(--border); padding: 4px 9px; border-radius: 6px; font-size: 12.5px; font-weight: 600; cursor: pointer; font-family: var(--font); font-variant-numeric: tabular-nums; min-width: 28px; transition: all .12s; }
.az-btn:hover { border-color: var(--primary); color: var(--primary); }
.az-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 16px; margin: 20px 0 32px; }
.term-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; transition: box-shadow .15s, border-color .15s; scroll-margin-top: 220px; }
.term-card:hover { border-color: #cbd5e1; box-shadow: var(--shadow-h); }
.term-card.flash { animation: flash 1.2s ease-out; border-color: var(--accent); }
@keyframes flash { 0% { background: var(--accent-50); } 100% { background: var(--card); } }
.term-head { display: flex; flex-direction: column; gap: 4px; margin-bottom: 6px; }
.term-title { font-size: 17px; font-weight: 700; margin: 0; line-height: 1.3; display: inline; }
.aliases { font-size: 12.5px; color: var(--muted-2); font-family: var(--mono); }
.term-def { margin: 6px 0 10px; font-size: 14.5px; line-height: 1.55; color: var(--text); }
.term-cite { margin: 0 0 10px; font-size: 12.5px; color: var(--muted); line-height: 1.5; padding: 8px 12px; background: var(--accent-50); border-left: 3px solid var(--accent); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.term-cite .cite-label { font-weight: 600; color: var(--muted-2); margin-right: 4px; }
.term-cite a { color: var(--primary-dark); font-weight: 500; }
.term-cite .accessed { color: var(--muted-2); margin-left: 6px; font-size: 11.5px; }
.term-meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 6px; }
.cat-pill { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; padding: 3px 9px; background: var(--primary-50); color: var(--primary); border-radius: 999px; }
.compare-deep { font-size: 11.5px; color: var(--muted); margin-left: auto; font-weight: 500; }
.compare-deep:hover { color: var(--primary); text-decoration: none; }
.related { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--border); font-size: 12.5px; color: var(--muted); line-height: 1.55; }
.related-label { font-weight: 600; color: var(--muted-2); margin-right: 4px; }
.related-link { color: var(--primary-dark); text-decoration: none; }
.related-link:hover { text-decoration: underline; }
.empty { grid-column: 1/-1; padding: 48px 24px; text-align: center; color: var(--muted); font-size: 16px; background: var(--card); border: 1px dashed var(--border); border-radius: var(--radius); }
.empty em { color: var(--primary); font-style: normal; font-weight: 600; }

/* Sibling references block */
.below-grid { margin: 8px 0 64px; padding: 28px 32px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.below-grid h2 { font-size: 18px; margin: 0 0 14px; color: var(--text); }
.sibling-list { padding-left: 18px; margin: 0; }
.sibling-list li { font-size: 14.5px; line-height: 1.6; color: var(--muted); margin-bottom: 8px; }
.sibling-list a { color: var(--primary-dark); }

/* mechanic: comparison */
.compare-table { width: 100%; border-collapse: collapse; font-size: 13.5px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.compare-table th, .compare-table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
.compare-table th { background: var(--primary-50); font-weight: 600; color: var(--primary-dark); }
.compare-table tr:nth-child(odd) td { background: rgba(0,0,0,.012); }
.compare-table .vendor { font-weight: 600; color: var(--primary-dark); }
.compare-table .ab { background: var(--accent-50) !important; }

/* mechanic: calculator */
.calc { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin: 24px 0; box-shadow: var(--shadow); display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.calc-inputs { display: flex; flex-direction: column; gap: 12px; }
.calc-inputs label { font-size: 13px; color: var(--muted); font-weight: 500; }
.calc-inputs input, .calc-inputs select { padding: 9px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 15px; font-family: var(--font); background: var(--bg); }
.calc-result { background: var(--primary-50); border: 1px solid var(--primary); border-radius: var(--radius); padding: 20px; }
.calc-result h3 { margin: 0 0 12px; font-size: 14px; text-transform: uppercase; letter-spacing: .08em; color: var(--primary-dark); }
.calc-result .big { font-size: 32px; font-weight: 800; color: var(--primary-dark); margin: 4px 0; line-height: 1.1; font-variant-numeric: tabular-nums; }
.calc-result .row { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px dashed rgba(0,0,0,.08); font-size: 14px; }
.calc-result .row:last-child { border: 0; }

/* mechanic: framework-hub / blueprints */
.bp-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; margin: 24px 0; }
.bp-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.bp-card h3 { margin: 0 0 6px; font-size: 16px; }
.bp-card .primitive-tag { font-size: 11px; font-weight: 600; padding: 3px 9px; background: var(--accent-50); color: var(--primary-dark); border-radius: 999px; }
.bp-card p { margin: 10px 0 0; font-size: 14px; line-height: 1.55; color: var(--text); }

/* mechanic: research-index */
.paper-list { list-style: none; padding: 0; margin: 24px 0; display: grid; gap: 12px; }
.paper-list li { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; }
.paper-list .title { font-weight: 600; font-size: 15.5px; margin: 0 0 4px; }
.paper-list .meta { color: var(--muted-2); font-size: 12.5px; margin: 0 0 8px; }
.paper-list .summary { font-size: 14px; line-height: 1.55; }

/* mechanic: decision-tool */
.dt-step { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; margin: 18px 0; box-shadow: var(--shadow); }
.dt-step h3 { margin: 0 0 12px; font-size: 17px; }
.dt-step .options { display: flex; flex-wrap: wrap; gap: 8px; }
.dt-step button { background: var(--bg); border: 1px solid var(--border); padding: 9px 14px; border-radius: var(--radius-sm); cursor: pointer; font-family: var(--font); font-size: 14px; }
.dt-step button:hover { border-color: var(--primary); color: var(--primary); }
.dt-step button.selected { background: var(--primary); color: #fff; border-color: var(--primary); }
.dt-result { background: var(--primary-50); border: 1px solid var(--primary); border-radius: var(--radius); padding: 20px; margin: 16px 0; }
.dt-result h3 { margin: 0 0 8px; color: var(--primary-dark); }

/* mechanic: directory */
.dir-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; margin: 24px 0; }
.dir-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; }
.dir-card h3 { margin: 0 0 4px; font-size: 15px; }
.dir-card .blurb { font-size: 13.5px; color: var(--muted); }

@media (max-width: 768px) {
  .hero { padding: 48px 0 28px; }
  .hero h1 { font-size: 30px; }
  .hero p.lede { font-size: 16px; }
  .calc { grid-template-columns: 1fr; }
  .satellite-footer .container { grid-template-columns: 1fr; gap: 20px; }
  .topnav-links { gap: 10px; }
  .topnav-links .nav-extra { display: none; }
  .compare-table { font-size: 12px; }
  .compare-table th, .compare-table td { padding: 8px 8px; }
  .controls { padding: 12px; top: 56px; position: relative; }
  .search-row { flex-direction: column; align-items: stretch; gap: 8px; }
  #result-count { text-align: right; }
  .grid { grid-template-columns: 1fr; gap: 12px; }
  .term-card { padding: 16px 18px; scroll-margin-top: 80px; }
  .term-title { font-size: 16px; }
  .below-grid { padding: 20px 18px; }
  .brand-sub { display: none; }
  .page-content { padding: 24px 22px; }
  .page-content h1 { font-size: 26px; }
  .az-nav { gap: 3px; }
  .az-btn { padding: 3px 7px; font-size: 11.5px; min-width: 24px; }
}