:root{
  --paper:#F2F4EF; --card:#FFFFFF; --ink:#1C2420; --ink-soft:#44524A; --ink-faint:#7C8A80;
  --rail:#1E6B45; --rail-soft:#E4F0E8; --rail-border:#8FC2A4;
  --oak:#8A5A28; --oak-soft:#F6EEDF; --oak-border:#D4B180;
  --cloud:#2A5E8C; --cloud-soft:#E7EEF5; --cloud-border:#93B4D0;
  --brass:#A07818; --halt:#A83030; --halt-soft:#F7EAEA;
  --rule:#CDD6CE; --rule-soft:#E4EAE2;
  --m-env:#7C8A80; --m-built:#8A5A28; --m-dep:#2A5E8C; --m-live:#1E6B45;
  --m-env-bg:#E9EDE9; --m-built-bg:#F6EEDF; --m-dep-bg:#E7EEF5; --m-live-bg:#E4F0E8;
  --m-env-border:#C9CFC9; --m-built-border:#D4B180; --m-dep-border:#93B4D0; --m-live-border:#8FC2A4;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --sans:system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,monospace;
  --shadow:0 1px 2px rgba(28,36,32,.06), 0 8px 24px rgba(28,36,32,.05);
}
@media (prefers-color-scheme:dark){:root{
  --paper:#141A16; --card:#1C241F; --ink:#E2EAE4; --ink-soft:#A4B4AA; --ink-faint:#66766C;
  --rail:#4CAA78; --rail-soft:#12241A; --rail-border:#2C6A4A;
  --oak:#C89050; --oak-soft:#241A0E; --oak-border:#6E5028;
  --cloud:#6098C8; --cloud-soft:#101E2C; --cloud-border:#2C5478;
  --brass:#C8A040; --halt:#C85050; --halt-soft:#2A1616;
  --rule:#2E3A32; --rule-soft:#202820;
  --m-env:#66766C; --m-built:#C89050; --m-dep:#6098C8; --m-live:#4CAA78;
  --m-env-bg:#1C221D; --m-built-bg:#241A0E; --m-dep-bg:#101E2C; --m-live-bg:#12241A;
  --m-env-border:#333D34; --m-built-border:#6E5028; --m-dep-border:#2C5478; --m-live-border:#2C6A4A;
  --shadow:0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
}}
:root[data-theme="dark"]{
  --paper:#141A16; --card:#1C241F; --ink:#E2EAE4; --ink-soft:#A4B4AA; --ink-faint:#66766C;
  --rail:#4CAA78; --rail-soft:#12241A; --rail-border:#2C6A4A;
  --oak:#C89050; --oak-soft:#241A0E; --oak-border:#6E5028;
  --cloud:#6098C8; --cloud-soft:#101E2C; --cloud-border:#2C5478;
  --brass:#C8A040; --halt:#C85050; --halt-soft:#2A1616;
  --rule:#2E3A32; --rule-soft:#202820;
  --m-env:#66766C; --m-built:#C89050; --m-dep:#6098C8; --m-live:#4CAA78;
  --m-env-bg:#1C221D; --m-built-bg:#241A0E; --m-dep-bg:#101E2C; --m-live-bg:#12241A;
  --m-env-border:#333D34; --m-built-border:#6E5028; --m-dep-border:#2C5478; --m-live-border:#2C6A4A;
  --shadow:0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
}
:root[data-theme="light"]{
  --paper:#F2F4EF; --card:#FFFFFF; --ink:#1C2420; --ink-soft:#44524A; --ink-faint:#7C8A80;
  --rail:#1E6B45; --rail-soft:#E4F0E8; --rail-border:#8FC2A4;
  --oak:#8A5A28; --oak-soft:#F6EEDF; --oak-border:#D4B180;
  --cloud:#2A5E8C; --cloud-soft:#E7EEF5; --cloud-border:#93B4D0;
  --brass:#A07818; --halt:#A83030; --halt-soft:#F7EAEA;
  --rule:#CDD6CE; --rule-soft:#E4EAE2;
  --m-env:#7C8A80; --m-built:#8A5A28; --m-dep:#2A5E8C; --m-live:#1E6B45;
  --m-env-bg:#E9EDE9; --m-built-bg:#F6EEDF; --m-dep-bg:#E7EEF5; --m-live-bg:#E4F0E8;
  --m-env-border:#C9CFC9; --m-built-border:#D4B180; --m-dep-border:#93B4D0; --m-live-border:#8FC2A4;
  --shadow:0 1px 2px rgba(28,36,32,.06), 0 8px 24px rgba(28,36,32,.05);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;color-scheme:light dark;}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.62;
  -webkit-font-smoothing:antialiased;}
a{color:var(--rail);text-decoration:none;} a:hover{text-decoration:underline;}
.serif{font-family:var(--serif);}
.wrap{max-width:900px;margin:0 auto;padding:0 24px;}
.wide{max-width:1120px;}
:focus-visible{outline:2px solid var(--rail);outline-offset:2px;}
::selection{background:var(--rail-soft);}

/* ── top nav + reading-lens / theme controls ── */
nav.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter:saturate(1.2) blur(8px);border-bottom:1px solid var(--rule);}
nav.top .inner{max-width:1120px;margin:0 auto;padding:11px 24px;display:flex;flex-wrap:wrap;
  gap:8px 18px;align-items:center;justify-content:space-between;}
nav.top .navlinks{display:flex;flex-wrap:wrap;gap:6px 18px;align-items:baseline;}
nav.top .brand{font-family:var(--serif);font-weight:700;font-size:16px;color:var(--ink);margin-right:8px;letter-spacing:-.01em;}
nav.top a{font-size:13px;color:var(--ink-soft);white-space:nowrap;}
nav.top a:hover{color:var(--rail);text-decoration:none;}
nav.top a.here{color:var(--rail);font-weight:600;}
nav.top .sep{color:var(--rule);font-size:12px;}
.controls{display:flex;align-items:center;gap:8px;flex:none;}
.lens-toggle{display:inline-flex;border:1.5px solid var(--rail-border);border-radius:9px;padding:3px;
  background:var(--rail-soft);gap:2px;}
.lens-toggle button{font-family:var(--mono);font-size:10.5px;letter-spacing:.07em;text-transform:uppercase;
  font-weight:700;border:none;background:transparent;color:var(--rail);padding:6px 11px;border-radius:6px;
  cursor:pointer;}
html[data-lens="tech"] .lens-toggle button[data-lens-btn="exec"]{background:transparent;}
html[data-lens="tech"] .lens-toggle button[data-lens-btn="tech"]{background:var(--rail);color:var(--card);}
html[data-lens="exec"] .lens-toggle button[data-lens-btn="exec"]{background:var(--rail);color:var(--card);}
html[data-lens="exec"] .lens-toggle button[data-lens-btn="tech"]{background:transparent;}
.themebtn{font-family:var(--mono);font-size:10.5px;letter-spacing:.04em;border:1.5px solid var(--rule);
  background:var(--card);color:var(--ink-soft);padding:6px 11px;border-radius:8px;cursor:pointer;}
.themebtn:hover{border-color:var(--rail);color:var(--ink);}

/* ── tiered nav: Platform dropdown ── */
.dropdown{position:relative;display:inline-block;}
.dropbtn{font-family:var(--sans);font-size:13px;color:var(--ink-soft);background:none;border:none;
  cursor:pointer;padding:0;font-weight:400;}
.dropbtn:hover,.dropdown.open .dropbtn{color:var(--rail);}
.dropdown.here .dropbtn{color:var(--rail);font-weight:600;}
.dropmenu{position:absolute;top:calc(100% + 14px);left:-14px;display:none;background:var(--card);
  border:1px solid var(--rule);border-radius:12px;box-shadow:0 8px 24px rgba(0,0,0,.1);
  padding:14px;gap:20px;z-index:30;}
.dropdown.open .dropmenu{display:flex;}
.dropcol{min-width:130px;}
.dropgroup{font-family:var(--mono);font-size:9.5px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-faint);font-weight:700;margin-bottom:6px;white-space:nowrap;}
.dropcol a{display:block;font-size:13.5px;color:var(--ink);padding:5px 0;white-space:nowrap;}
.dropcol a:hover{color:var(--rail);text-decoration:none;}
.dropcol a.here{color:var(--rail);font-weight:600;}

/* ── nav search ── */
.navsearch{position:relative;}
.navsearch input{font-family:var(--sans);font-size:12.5px;border:1.5px solid var(--rule);background:var(--paper);
  color:var(--ink);border-radius:8px;padding:6px 10px;width:130px;transition:width .15s;}
.navsearch input:focus{width:200px;outline:2px solid var(--rail);outline-offset:1px;}
.navsearch .results{position:absolute;top:calc(100% + 8px);right:0;width:280px;max-height:340px;overflow-y:auto;
  background:var(--card);border:1px solid var(--rule);border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.12);
  display:none;z-index:30;}
.navsearch.open .results{display:block;}
.navsearch .results a{display:block;padding:9px 13px;border-bottom:1px solid var(--rule-soft);}
.navsearch .results a:last-child{border-bottom:none;}
.navsearch .results a:hover{background:var(--rail-soft);text-decoration:none;}
.navsearch .results .rt{font-size:13px;color:var(--ink);font-weight:600;}
.navsearch .results .rs{font-size:11.5px;color:var(--ink-faint);margin-top:2px;}
.navsearch .empty{padding:12px 13px;font-size:12.5px;color:var(--ink-faint);}
[data-lens-content]{display:none;}
html[data-lens="exec"] [data-lens-content="exec"],
html[data-lens="tech"] [data-lens-content="tech"]{display:block;}
/* tech-only supplementary detail (implementation notes, raw tables/code): hidden under Exec lens */
[data-lens="tech-only"]{display:none;}
html[data-lens="tech"] [data-lens="tech-only"]{display:block;}

/* ── hero ── */
header.hero{padding:64px 0 40px;}
.eyebrow{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--rail);font-weight:700;margin-bottom:16px;}
h1{font-family:var(--serif);font-size:clamp(34px,6vw,54px);line-height:1.04;margin:0 0 18px;letter-spacing:-.018em;text-wrap:balance;}
.lede{font-size:20px;color:var(--ink-soft);max-width:64ch;margin:0;} .lede b{color:var(--ink);font-weight:600;}

/* ── rotating phrase mechanism (shared by hero + companion band) ── */
.rotator{display:grid;}
.rotator .rot-phrase{grid-row:1;grid-column:1;opacity:0;transform:translateY(14px) scale(.98);
  transition:opacity .5s ease,transform .5s ease;}
.rotator .rot-phrase[data-active]{opacity:1;transform:translateY(0) scale(1);}
.rotator .rot-phrase.c1{color:var(--rail);}
.rotator .rot-phrase.c2{color:var(--oak);}
.rotator .rot-phrase.c3{color:var(--cloud);}
@media (prefers-reduced-motion:reduce){
  .rotator .rot-phrase{transition:none!important;transform:none!important;}
}
h1 .rotator{font-family:var(--serif);font-size:inherit;line-height:inherit;letter-spacing:inherit;}
.rotator-sm{display:inline-grid;font-weight:700;vertical-align:top;}

/* ── companion band (secondary rotator, below hero) ── */
.companion-band{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);background:var(--card);padding:20px 0;}
.companion-line{margin:0;font-size:16.5px;color:var(--ink-soft);text-align:center;}

/* ── sections / content ── */
main{padding:8px 0 80px;}
h2{font-family:var(--serif);font-size:28px;margin:44px 0 6px;letter-spacing:-.012em;line-height:1.1;}
.kicker{font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--rail);font-weight:700;margin-top:40px;}
h3{font-family:var(--serif);font-size:22px;margin:26px 0 4px;letter-spacing:-.01em;}
h4{font-size:12px;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-faint);margin:22px 0 2px;font-weight:700;}
p{font-size:16.5px;margin:14px 0;max-width:72ch;} p.small{font-size:14px;color:var(--ink-soft);}
ul{margin:8px 0;padding-left:22px;max-width:72ch;} li{margin:8px 0;font-size:15.5px;} li b{font-weight:650;}
.card p,footer p,.pcard p{max-width:none;}
code{font-family:var(--mono);font-size:.85em;background:var(--rule-soft);padding:1px 6px;border-radius:4px;}
.pull{font-family:var(--serif);font-size:22px;line-height:1.36;color:var(--ink);border-left:3px solid var(--rail);
  padding:6px 0 6px 20px;margin:26px 0;}

/* ── helper-definition glossary term ── */
.gloss{position:relative;display:inline;border-bottom:1.5px dotted var(--ink-faint);cursor:help;
  color:var(--ink);font-weight:600;}
.gloss:hover,.gloss:focus-visible{border-bottom-color:var(--rail);color:var(--rail);}
.gloss .pop{position:absolute;left:0;bottom:calc(100% + 8px);width:min(280px,72vw);z-index:30;
  background:var(--ink);color:var(--paper);font-family:var(--sans);font-weight:400;font-size:12.5px;
  line-height:1.5;padding:10px 13px;border-radius:9px;box-shadow:var(--shadow);
  opacity:0;transform:translateY(4px);pointer-events:none;transition:opacity .12s,transform .12s;}
.gloss .pop b{color:var(--paper);display:block;font-size:10px;font-family:var(--mono);
  letter-spacing:.08em;text-transform:uppercase;margin-bottom:3px;opacity:.7;font-weight:700;}
.gloss:hover .pop,.gloss:focus-visible .pop{opacity:1;transform:translateY(0);}

/* ── pointer-link cards (overview) ── */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:22px 0;}
/* functions.html: fixed-width cards, left-justified (matches every other page's reading column) — capped so a 1-card layer doesn't stretch full-bleed, but not centered */
.grid.fn-grid{grid-template-columns:repeat(auto-fill,minmax(260px,340px));justify-content:start;}
.card{display:block;background:var(--card);border:1px solid var(--rule);border-radius:11px;padding:18px 20px;
  box-shadow:var(--shadow);transition:border-color .15s, transform .15s;}
.card:hover{border-color:var(--rail);transform:translateY(-2px);text-decoration:none;}
.card .n{font-family:var(--serif);font-size:13px;color:var(--rail);font-weight:700;}
.card h3{margin:4px 0 6px;font-size:19px;}
.card p{margin:0;font-size:13.5px;color:var(--ink-soft);}

/* ── layer page header ── */
.layerhead{border-bottom:1px solid var(--rule);padding-bottom:8px;display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;}
.layerhead .n{font-family:var(--serif);font-size:14px;color:var(--rail);font-weight:700;}
.prevnext{display:flex;justify-content:space-between;gap:12px;margin-top:56px;border-top:1px solid var(--rule);padding-top:18px;font-size:13.5px;}
.prevnext a{color:var(--ink-soft);} .prevnext a:hover{color:var(--rail);}

/* ── visual-describe callout (internal production note — tech lens only) ── */
.vis{border-left:3px solid var(--cloud);background:var(--card);border-radius:0 8px 8px 0;padding:12px 16px;margin:18px 0;font-size:13.5px;color:var(--ink-soft);}
.vis b{color:var(--cloud);text-transform:uppercase;font-size:11px;letter-spacing:.06em;}

/* ── anatomy figure (clickable, inline SVG, theme-synced) ── */
.anatomy-wrap{display:grid;grid-template-columns:minmax(240px,320px) 1fr;gap:26px;align-items:start;margin:22px 0 30px;}
.figure-box{position:sticky;top:76px;}
.figure-box svg{width:100%;height:auto;display:block;}
.organ{cursor:pointer;}
.organ .oshape{fill:var(--card);stroke:var(--rule);stroke-width:1.6;transition:fill .15s,stroke .15s,stroke-width .15s;}
.organ text{font-family:var(--mono);font-size:9px;fill:var(--ink-faint);text-transform:uppercase;letter-spacing:.05em;pointer-events:none;transition:fill .15s;}
.organ:hover .oshape{stroke:var(--rail);}
.organ.sel .oshape{fill:var(--rail-soft);stroke:var(--rail);stroke-width:2.6;}
.organ.sel text{fill:var(--rail);font-weight:700;}
.organ:focus-visible{outline:none;}
.organ:focus-visible .oshape{stroke:var(--rail);stroke-width:2.6;filter:drop-shadow(0 0 0 2px var(--rail-soft));}
.figure-hint{font-family:var(--mono);font-size:11px;color:var(--ink-faint);margin:10px 0 0;text-align:center;}
.organ-detail{border:1.5px solid var(--rail-border);border-radius:12px;padding:20px 24px;min-height:200px;background:var(--card);box-shadow:var(--shadow);}
.organ-detail .od-num{font-family:var(--mono);font-size:10.5px;color:var(--rail);letter-spacing:.1em;text-transform:uppercase;}
.organ-detail h4{font-family:var(--serif);font-size:21px;margin:4px 0 2px;}
.organ-detail .od-tech{font-family:var(--mono);font-size:11px;color:var(--ink-faint);display:block;margin-bottom:11px;}
.organ-detail p{font-size:14px;color:var(--ink-soft);margin:0;max-width:none;}
.acid-test{border-left:4px solid var(--oak);background:var(--oak-soft);border-radius:0 10px 10px 0;padding:15px 19px;margin-top:16px;}
.acid-test b{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--oak);display:block;margin-bottom:5px;}
.acid-test p{margin:0;font-size:13px;color:var(--ink-soft);max-width:none;}
@media (max-width:760px){.anatomy-wrap{grid-template-columns:1fr;}.figure-box{position:static;}}

/* ── diagram figure (built SVG assets) ── */
figure.diagram{margin:22px 0;border:1.5px solid var(--rule);border-radius:12px;background:var(--card);
  padding:10px;box-shadow:0 1px 2px rgba(0,0,0,.05), 0 8px 20px rgba(0,0,0,.04);}
figure.diagram img{display:block;width:100%;height:auto;border-radius:6px;}
figure.diagram figcaption{font-size:12px;color:var(--ink-faint);padding:10px 8px 4px;line-height:1.5;}
figure.diagram .dl{display:inline-flex;align-items:center;gap:5px;font-family:var(--mono);font-size:10px;
  letter-spacing:.05em;text-transform:uppercase;color:var(--rail);text-decoration:none;font-weight:700;
  margin-left:8px;}
figure.diagram .dl:hover{text-decoration:underline;}

/* ── badges (credibility markers, used sparingly and only where genuinely earned) ── */
.badge{display:inline-flex;align-items:center;gap:5px;font-size:10.5px;font-weight:700;letter-spacing:.06em;
  text-transform:uppercase;padding:3px 10px 3px 8px;border-radius:20px;vertical-align:middle;border:1.5px solid;
  white-space:nowrap;}
.badge::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor;flex:none;}
.b-env{color:var(--m-env);background:var(--m-env-bg);border-color:var(--m-env-border);}
.b-built{color:var(--m-built);background:var(--m-built-bg);border-color:var(--m-built-border);}
.b-dep{color:var(--m-dep);background:var(--m-dep-bg);border-color:var(--m-dep-border);}
.b-live{color:var(--m-live);background:var(--m-live-bg);border-color:var(--m-live-border);}

/* ── tables ── */
.scroll{overflow-x:auto;margin:10px 0;}
table{width:100%;border-collapse:collapse;font-size:14px;min-width:520px;}
th{text-align:left;font-size:11px;letter-spacing:.05em;text-transform:uppercase;color:var(--ink-faint);font-weight:700;padding:9px 12px 9px 0;border-bottom:1px solid var(--rule);}
td{padding:11px 12px 11px 0;border-bottom:1px solid var(--rule-soft);vertical-align:top;}

/* ── draft banner + footer ── */
.draft{background:var(--rail-soft);color:var(--rail);font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;padding:5px 12px;border-radius:5px;display:inline-block;margin:18px 0 0;}
footer.site{border-top:1px solid var(--rule);margin-top:60px;}
footer.site .inner{max-width:1120px;margin:0 auto;padding:22px 24px 40px;font-size:12px;color:var(--ink-faint);line-height:1.6;}

/* ── CTA ── */
.cta{display:inline-flex;align-items:center;gap:8px;background:var(--rail);color:var(--paper);
  font-family:var(--sans);font-size:15px;font-weight:600;padding:12px 22px;border-radius:10px;
  text-decoration:none;box-shadow:0 4px 14px rgba(30,107,69,.25);transition:transform .12s,box-shadow .12s;}
.cta:hover{transform:translateY(-1px);box-shadow:0 6px 18px rgba(30,107,69,.32);text-decoration:none;}
.cta.small{font-size:13px;padding:9px 16px;border-radius:8px;box-shadow:none;}
.hero-cta{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:24px;}
.hero-cta .sub-link{font-size:13.5px;color:var(--ink-soft);}
footer.cta-strip{border-top:1px solid var(--rule);margin-top:60px;background:var(--card);}
footer.cta-strip .inner{max-width:1120px;margin:0 auto;padding:40px 24px;text-align:center;}
footer.cta-strip h3{font-family:var(--serif);font-size:26px;margin:0 0 10px;}
footer.cta-strip p{color:var(--ink-soft);margin:0 0 20px;}