:root{
  --bg:#f7f1e6; --surface:#fffbf3; --surface-2:#efe6d4; --border:#ddd0b8;
  --text:#1a1612; --muted:#5e5446; --accent:#b91c1c; --accent-soft:#f8e3dc;
  --accent-2:#9a3412; --on-accent:#fffbf3; --macro:#b91c1c; --cluster:#3f6212; --heat:#1f4e79;
  --shadow:0 1px 2px rgba(40,28,12,.06), 0 8px 24px rgba(40,28,12,.08);
  --s1:#2a78d6; --s2:#eb6834;
  --radius:14px; --maxw:1080px;
}
:root:not([data-theme="light"]) { }
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#17130e; --surface:#1f1a13; --surface-2:#261f17;
    --border:#3a3125; --text:#f1e8d8; --muted:#b0a28b; --accent:#f87171;
    --accent-soft:#3a1714; --accent-2:#fdba74; --on-accent:#17130e; --macro:#f87171; --cluster:#a3e635; --heat:#7fb0e0;
    --s1:#3987e5; --s2:#d95926;
    --shadow:0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.38);
  }
}
:root[data-theme="dark"]{
  --bg:#17130e; --surface:#1f1a13; --surface-2:#261f17;
  --border:#3a3125; --text:#f1e8d8; --muted:#b0a28b; --accent:#f87171;
  --accent-soft:#3a1714; --accent-2:#fdba74; --on-accent:#17130e; --macro:#f87171; --cluster:#a3e635; --heat:#7fb0e0;
  --s1:#3987e5; --s2:#d95926;
  --shadow:0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.38);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--text);
  font-family:"Source Serif 4",Georgia,"Times New Roman",serif;
  line-height:1.6; -webkit-font-smoothing:antialiased; overflow-anchor:none;
}
a{color:var(--accent); text-decoration:none}
a:hover{text-decoration:underline}
code,.mono{font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace}
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 16px}
.wrap.narrow{max-width:760px}
section{padding:56px 0}
h2{font-size:clamp(1.4rem,3vw,1.9rem); font-weight:700; letter-spacing:-.02em; margin:0 0 6px}
.lede{color:var(--muted); max-width:62ch; margin:0 0 28px}

/* header */
header.nav{
  position:sticky; top:0; z-index:20; backdrop-filter:blur(10px);
  background:color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom:1px solid var(--border);
}
.nav .wrap{display:flex; align-items:center; gap:18px; height:58px}
.brand{font-weight:700; letter-spacing:-.02em; font-size:1.02rem; color:var(--text)}
.brand:hover{text-decoration:none}
.brand .dot{color:var(--accent)}
.nav nav{margin-left:auto; display:flex; gap:20px; align-items:center}
.nav nav a{color:var(--muted); font-size:.92rem; font-weight:500}
.nav nav a:hover{color:var(--text); text-decoration:none}
.btn{
  display:inline-flex; align-items:center; gap:8px; font-weight:600; font-size:.92rem;
  padding:9px 16px; border-radius:10px; border:1px solid var(--border);
  background:var(--surface); color:var(--text); cursor:pointer;
}
.btn.primary{background:var(--accent); color:var(--on-accent); border-color:transparent}
.btn.primary:hover{text-decoration:none; filter:brightness(1.06)}
.btn:hover{text-decoration:none}
.theme-toggle{background:transparent; border:1px solid var(--border); color:var(--muted);
  width:34px; height:34px; border-radius:9px; cursor:pointer; font-size:1rem; line-height:1}

/* hero */
.hero{position:relative; overflow:hidden; padding:72px 0 40px; border-bottom:1px solid var(--border)}
.hero::before{
  content:""; position:absolute; inset:0; z-index:0; opacity:.5;
  background-image:linear-gradient(var(--border) 1px, transparent 1px),
                   linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size:34px 34px;
  mask-image:radial-gradient(ellipse 70% 60% at 50% 0%, #000 30%, transparent 75%);
}
.hero .wrap{position:relative; z-index:1}
.eyebrow{
  display:inline-block; font-size:.78rem; font-weight:600; letter-spacing:.04em;
  text-transform:uppercase; color:var(--accent); background:var(--accent-soft);
  padding:5px 11px; border-radius:999px; margin-bottom:18px;
}
.hero h1{font-size:clamp(2.1rem,6vw,3.4rem); line-height:1.05; letter-spacing:-.03em; margin:0 0 16px; font-weight:800}
.hero p.tag{font-size:clamp(1.02rem,2.2vw,1.22rem); color:var(--muted); max-width:62ch; margin:0 0 26px}
.cta{display:flex; flex-wrap:wrap; gap:12px; margin-bottom:28px}
.badges{display:flex; flex-wrap:wrap; gap:8px}
.badge{font-size:.8rem; font-weight:500; color:var(--muted); background:var(--surface-2);
  border:1px solid var(--border); padding:5px 11px; border-radius:8px}

/* demo figure */
.demo{margin:34px auto 0; max-width:620px}
.demo .frame{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:12px; box-shadow:var(--shadow);
}
.demo img{width:100%; height:auto; display:block; border-radius:8px}
figcaption{color:var(--muted); font-size:.86rem; margin-top:12px; text-align:center}
.legend{display:inline-flex; gap:16px; margin-top:8px; font-size:.82rem; color:var(--muted)}
.legend b{font-weight:600}
.sw{display:inline-block; width:10px; height:10px; border-radius:3px; vertical-align:middle; margin-right:5px}
.sw.m{background:var(--macro)} .sw.c{background:var(--cluster)}

/* pipeline */
.pipe{display:grid; grid-template-columns:repeat(4,1fr); gap:14px}
.step{background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:20px 18px; box-shadow:var(--shadow); position:relative}
.step .n{font-family:"JetBrains Mono",monospace; font-size:.78rem; color:var(--accent); font-weight:600}
.step h3{margin:8px 0 6px; font-size:1.02rem; font-weight:650}
.step p{margin:0; color:var(--muted); font-size:.9rem}
.step:not(:last-child)::after{
  content:"\2192"; position:absolute; right:-13px; top:50%; transform:translateY(-50%);
  color:var(--muted); font-size:1.1rem; z-index:2;
}

/* generic cards grid */
.grid{display:grid; gap:16px}
.grid.two{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface); border:1px solid var(--border); border-radius:var(--radius);
  padding:22px; box-shadow:var(--shadow)}
.card h3{margin:0 0 8px; font-size:1.05rem; font-weight:650}
.card p{margin:0; color:var(--muted); font-size:.93rem}
.card.accent{border-color:var(--accent); background:var(--accent-soft)}
.card.accent h3{color:var(--accent)}
.card.accent p{color:var(--text)}
.tag-mini{display:inline-block; font-size:.72rem; font-weight:600; text-transform:uppercase;
  letter-spacing:.03em; color:var(--accent-2); margin-bottom:6px}

/* table */
.tablewrap{overflow-x:auto; border:1px solid var(--border); border-radius:var(--radius); box-shadow:var(--shadow)}
table{border-collapse:collapse; width:100%; min-width:640px; background:var(--surface)}
th,td{text-align:left; padding:13px 16px; border-bottom:1px solid var(--border); font-size:.9rem; vertical-align:top}
th{background:var(--surface-2); font-weight:650; font-size:.82rem; text-transform:uppercase; letter-spacing:.03em; color:var(--muted)}
tr:last-child td{border-bottom:none}
td .v{font-family:"JetBrains Mono",monospace; font-weight:600; color:var(--accent)}

/* figure block */
.figblock{display:grid; grid-template-columns:1.1fr 1fr; gap:28px; align-items:center}
.figblock img{width:100%; height:auto; border:1px solid var(--border); border-radius:var(--radius);
  background:var(--surface); box-shadow:var(--shadow)}

/* skills list */
.skills{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
.skill{display:flex; gap:12px; align-items:flex-start}
.skill .ic{flex:0 0 auto; width:30px; height:30px; border-radius:8px; background:var(--accent-soft);
  color:var(--accent); display:grid; place-items:center; font-weight:700; font-size:.9rem}
.skill h4{margin:2px 0 2px; font-size:.96rem; font-weight:650}
.skill p{margin:0; color:var(--muted); font-size:.88rem}

/* stack */
.stack{display:flex; flex-wrap:wrap; gap:10px}
.chip{font-size:.86rem; font-weight:500; background:var(--surface); border:1px solid var(--border);
  padding:8px 14px; border-radius:9px}

footer{border-top:1px solid var(--border); padding:34px 0; color:var(--muted); font-size:.88rem}
footer .wrap{display:flex; flex-wrap:wrap; gap:14px; align-items:center; justify-content:space-between}
footer a{color:var(--muted)} footer a:hover{color:var(--text)}

.note{background:var(--surface-2); border:1px solid var(--border); border-left:3px solid var(--accent-2);
  border-radius:10px; padding:16px 18px; color:var(--muted); font-size:.9rem}

/* version build-up ladder */
.ladder{display:flex; flex-direction:column; gap:10px; margin-top:6px}
.vrow{display:flex; flex-direction:column}
.rung{display:flex; align-items:stretch; gap:12px; width:100%; text-align:left; font:inherit;
  color:inherit; background:none; border:none; padding:0; cursor:pointer; scroll-margin-top:72px}
.rung:hover .seg.new{filter:brightness(1.06)}
.rung:hover .vtag{border-color:var(--accent); color:var(--accent)}
.rung:focus-visible{outline:2px solid var(--accent); outline-offset:3px; border-radius:12px}
.rung .vtag{flex:0 0 auto; width:46px; border-radius:10px; display:grid; place-items:center;
  font-family:"JetBrains Mono",monospace; font-weight:700; font-size:.92rem;
  background:var(--surface); border:1px solid var(--border); color:var(--text)}
.rung .bar{display:flex; align-items:stretch; gap:6px; flex:1 1 auto; min-height:48px}
.seg{border-radius:8px}
.seg.inh{flex:0 0 auto; width:24px; background:var(--surface); border:1px solid var(--border)}
.seg.new{flex:1 1 auto; min-width:0; display:flex; align-items:center; justify-content:space-between;
  gap:10px; padding:0 16px; background:var(--accent); color:var(--on-accent); font-weight:600; font-size:.9rem;
  box-shadow:var(--shadow)}
.chev{flex:0 0 auto; transition:transform .25s ease; opacity:.9; font-size:1.2rem; line-height:1}
.vrow.open .chev{transform:rotate(90deg)}
.detail{display:grid; grid-template-rows:0fr; transition:grid-template-rows .28s ease; margin-left:58px}
.vrow.open .detail{grid-template-rows:1fr}
.detail .dwrap{overflow:hidden}
.detail .dcontent{background:var(--surface); border:1px solid var(--border); border-radius:12px;
  padding:15px 18px; margin-top:8px}
.detail p{margin:0 0 8px; color:var(--muted); font-size:.9rem; line-height:1.55}
.detail p:last-child{margin-bottom:0}
.detail .res{color:var(--text); font-weight:500}
.detail .res b{color:var(--accent-2); font-weight:650}
.detail .readmore{display:inline-flex; align-items:center; gap:6px; margin-top:12px;
  font-size:.88rem; font-weight:600; color:var(--accent)}
.laddercap{color:var(--muted); font-size:.84rem; margin-top:14px}

/* ============================================================
   version documentation pages (v1.html ... v6.html)
   ============================================================ */

/* version page header block */
.vhead{position:relative; overflow:hidden; padding:40px 0 34px; border-bottom:1px solid var(--border)}
.vhead::before{
  content:""; position:absolute; inset:0; z-index:0; opacity:.5;
  background-image:linear-gradient(var(--border) 1px, transparent 1px),
                   linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size:34px 34px;
  mask-image:radial-gradient(ellipse 80% 70% at 50% 0%, #000 25%, transparent 78%);
}
.vhead .wrap{position:relative; z-index:1}
.backlink{display:inline-block; font-size:.88rem; font-weight:600; color:var(--muted); margin-bottom:16px}
.backlink:hover{color:var(--accent); text-decoration:none}
.vhead h1{font-size:clamp(1.7rem,4.5vw,2.6rem); line-height:1.08; letter-spacing:-.025em;
  margin:0 0 14px; font-weight:800}
.vhead p.tag{font-size:clamp(1rem,2vw,1.15rem); color:var(--muted); max-width:64ch; margin:0}

/* previous / next pager */
.pager{display:flex; gap:12px; flex-wrap:wrap; margin-top:24px}
.pager a, .pager span.disabled{
  display:inline-flex; flex-direction:column; gap:2px; min-width:0;
  border:1px solid var(--border); border-radius:12px; padding:10px 15px;
  background:var(--surface); box-shadow:var(--shadow); max-width:100%;
}
.pager a:hover{text-decoration:none; border-color:var(--accent)}
.pager span.disabled{opacity:.45; box-shadow:none}
.pager .dir{font-size:.72rem; font-weight:600; text-transform:uppercase; letter-spacing:.04em; color:var(--muted)}
.pager .lab{font-size:.92rem; font-weight:650; color:var(--text); white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.pager .next{text-align:right; margin-left:auto}

/* prose sections on a version page */
.prose h2{margin:34px 0 10px}
.prose h2:first-child{margin-top:0}
.prose p{color:var(--text); margin:0 0 14px; max-width:68ch}
.prose p.muted{color:var(--muted)}
.prose ul{color:var(--text); margin:0 0 14px; padding-left:22px; max-width:68ch}
.prose li{margin:0 0 7px}
.prose em{color:var(--text); font-style:italic}
.prose strong{font-weight:650}

/* figures on a version page */
.figrow{display:grid; grid-template-columns:repeat(2,1fr); gap:18px; margin:18px 0 6px}
.figrow.one{grid-template-columns:1fr; max-width:620px}
.figrow figure{margin:0}
.figrow img{width:100%; height:auto; display:block; border:1px solid var(--border);
  border-radius:var(--radius); background:var(--surface); box-shadow:var(--shadow)}
.figrow figcaption{text-align:left; margin-top:9px; font-size:.84rem}

/* result callout, colour-coded by kind */
.callout{border:1px solid var(--border); border-left-width:3px; border-radius:12px;
  padding:16px 18px; margin:14px 0; background:var(--surface-2); font-size:.95rem; color:var(--text)}
.callout .k{display:block; font-size:.72rem; font-weight:700; text-transform:uppercase;
  letter-spacing:.04em; margin-bottom:6px}
.callout.good{border-left-color:var(--accent)} .callout.good .k{color:var(--accent)}
.callout.warn{border-left-color:var(--macro)} .callout.warn .k{color:var(--macro)}
.callout.info{border-left-color:var(--accent-2)} .callout.info .k{color:var(--accent-2)}

/* "see the code" link row at the foot of a version page */
.codelink{display:flex; flex-wrap:wrap; gap:12px; margin-top:28px}

.prose h3{font-size:1.08rem; font-weight:650; margin:30px 0 10px}

/* inline-SVG diagrams: all colours come from the theme tokens */
.diagram{margin:18px 0 20px; background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius); box-shadow:var(--shadow); padding:18px 18px 14px}
.diagram .scroll{overflow-x:auto}
.diagram svg{display:block; width:100%; height:auto; min-width:540px}
.diagram figcaption{text-align:left; margin-top:10px; font-size:.84rem}
.dg-bg{fill:var(--surface-2)}
.dg-grid{fill:none; stroke:var(--border); stroke-width:1}
.dg-legal{fill:var(--heat); fill-opacity:.22}
.dg-macro{fill:var(--macro); fill-opacity:.85}
.dg-hint{fill:var(--accent-2); fill-opacity:.4}
.dg-new{stroke:var(--text); stroke-width:2}
.dg-choice{fill:none; stroke:var(--accent); stroke-width:2.5; stroke-dasharray:6 4}
.dg-dot{fill:var(--accent)}
.dg-frame{fill:var(--surface-2); stroke:var(--border)}
.dg-chip{fill:var(--surface); stroke:var(--border)}
.dg-chip.final{fill:var(--accent-soft); stroke:var(--accent)}
.dg-flow{fill:none; stroke:var(--accent-2); stroke-width:1.8}
.dg-head{fill:var(--accent-2)}
.dg-numc{fill:var(--surface); stroke:var(--text); stroke-width:1.4}
.dg-t{fill:var(--text); font-family:"Source Serif 4",Georgia,serif; font-size:12.5px}
.dg-m{fill:var(--muted); font-family:"Source Serif 4",Georgia,serif; font-size:11.5px}
.dg-k{fill:var(--accent-2); font-family:"Source Serif 4",Georgia,serif; font-size:10.5px; font-weight:700; letter-spacing:.06em}
.dg-b{font-weight:650}
.dg-big{font-size:15px; font-weight:700}
.dg-bar{fill:var(--accent)}
.dg-bar.dim{fill-opacity:.5}

/* beginner glossary */
.gloss{display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin:16px 0 8px}
.gloss .g{background:var(--surface); border:1px solid var(--border); border-radius:12px; padding:13px 15px}
.gloss .g b{display:block; font-size:.92rem; font-weight:650; margin-bottom:3px}
.gloss .g p{margin:0; font-size:.85rem; color:var(--text); line-height:1.45}
.gloss .g p.here{margin-top:5px; color:var(--muted)}
.primer{background:var(--accent-soft); border:1px solid var(--border); border-radius:var(--radius);
  padding:18px 20px; margin:6px 0 4px}
.primer p{margin:0; max-width:none}

/* design-choice cards */
.choices{display:grid; grid-template-columns:repeat(2,1fr); gap:14px; margin:20px 0 6px}
.choice{background:var(--surface); border:1px solid var(--border); border-radius:12px; padding:16px 18px}
.choice .n{font-family:"JetBrains Mono",monospace; font-size:.74rem; font-weight:600; color:var(--accent)}
.choice h4{margin:4px 0 8px; font-size:.98rem; font-weight:650}
.choice p{margin:0 0 6px; font-size:.87rem; color:var(--muted); line-height:1.5}
.choice p:last-child{margin-bottom:0}
.choice p b{color:var(--text); font-weight:600}

/* same-as / differs-from pills */
.pill{display:inline-block; font-size:.72rem; font-weight:700; padding:3px 9px; border-radius:999px; white-space:nowrap}
.pill.same{background:var(--accent-soft); color:var(--accent)}
.pill.diff{background:var(--surface-2); color:var(--muted); border:1px solid var(--border)}

@media (max-width:560px){
  .rung .vtag{width:38px; font-size:.82rem}
  .seg.inh{width:13px}
  .seg.new{padding:0 11px; font-size:.8rem}
  .detail{margin-left:0}
}

@media (max-width:860px){
  .pipe{grid-template-columns:repeat(2,1fr)}
  .step:nth-child(2)::after{display:none}
  .figblock{grid-template-columns:1fr}
  .grid.two,.skills{grid-template-columns:1fr}
  .figrow{grid-template-columns:1fr}
  .choices{grid-template-columns:1fr}
  .gloss{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:560px){
  .gloss{grid-template-columns:1fr}
}
@media (max-width:560px){
  .pipe{grid-template-columns:1fr}
  .step::after{display:none !important}
  .nav nav a.hide-sm{display:none}
}

/* reinforcement-learning method ladder with equations */
.rl-steps{display:grid; gap:14px; margin:18px 0 22px}
.rl-step{border:1px solid var(--border); border-radius:12px; background:var(--surface); padding:16px 18px 14px}
.rl-step.other{background:var(--surface-2)}
.rl-step.final{border-color:var(--accent); box-shadow:0 0 0 1px var(--accent-soft)}
.rl-step .lbl{display:block; font-size:.72rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase; color:var(--accent-2)}
.rl-step h4{margin:4px 0 6px; font-size:1.02rem}
.rl-step p{margin:6px 0}
.eq{overflow-x:auto; padding:8px 12px; margin:12px 0; background:var(--surface-2); border-radius:8px}
.rl-step.other .eq{background:var(--surface)}
.eq math{margin:6px 0}
math{font-family:"STIX Two Math","Cambria Math","Latin Modern Math",math; font-size:1.12em}
.sym{display:grid; grid-template-columns:max-content 1fr; gap:6px 14px; margin:10px 0; font-size:.88rem; align-items:baseline}
.sym dt{text-align:right; white-space:nowrap}
.sym dd{margin:0; color:var(--muted)}
.verdict{font-size:.9rem; border-top:1px dashed var(--border); padding-top:9px; margin-top:12px}
.verdict b.fix{color:var(--accent)}
.verdict b.gap{color:var(--macro)}
.dg-curve{fill:none; stroke:var(--accent-2); stroke-width:2.5}
.dg-flat{fill:none; stroke:var(--macro); stroke-width:3.5}
@media (max-width:560px){ .sym{grid-template-columns:1fr} .sym dt{text-align:left} }

/* V2 diagrams: forces, cost terms, stacked cost bars */
.dg-clu{fill:var(--cluster)}
.dg-cross{fill:none; stroke:var(--text); stroke-width:2}
.dg-range{fill:var(--accent-soft); stroke:var(--accent); stroke-width:1.2; stroke-dasharray:4 4}
.dg-margin{fill:none; stroke:var(--macro); stroke-width:1.4; stroke-dasharray:5 4}
.dg-box{fill:none; stroke:var(--accent-2); stroke-width:2; stroke-dasharray:6 4}
.dg-heat{fill:var(--heat)}
.dg-edge{fill:none; stroke:var(--muted); stroke-width:1.3}
/* chart series (validated categorical pair, light and dark) */
.ch-line.s1{stroke:var(--s1)} .ch-line.s2{stroke:var(--s2)}
.ch-line{fill:none; stroke-width:2; stroke-linejoin:round}
.ch-dot.s1{fill:var(--s1)} .ch-dot.s2{fill:var(--s2)}
.ch-dot{stroke:var(--surface); stroke-width:2}
.ch-ring.s1{stroke:var(--s1)} .ch-ring.s2{stroke:var(--s2)}
.ch-ring{fill:var(--surface); stroke-width:2}
.ch-err.s1{stroke:var(--s1)} .ch-err.s2{stroke:var(--s2)}
.ch-err{stroke-width:1.5; stroke-opacity:.55}
.ch-axis{stroke:var(--muted); stroke-width:1}
.ch-gridl{stroke:var(--border); stroke-width:1}
.ch-hit{fill:transparent; cursor:default}
.dg-seg-w{fill:var(--accent); fill-opacity:.35; stroke:var(--accent); stroke-width:1.5}
.dg-seg-c{fill:var(--muted); fill-opacity:.25; stroke:var(--muted); stroke-width:1.5}
.dg-seg-d{fill:var(--macro); fill-opacity:.35; stroke:var(--macro); stroke-width:1.5}

/* single-page layout: sticky table of contents beside the content */
.doc{display:grid; grid-template-columns:170px minmax(0,760px); gap:48px; justify-content:center;
  max-width:var(--maxw); margin:0 auto; padding:0 16px}
.toc{position:sticky; top:58px; align-self:start; padding:56px 0 24px; font-size:.88rem}
.toc .tt{display:block; font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.05em;
  color:var(--muted); margin:0 0 10px 14px}
.toc a{display:block; color:var(--muted); padding:5px 0 5px 12px; border-left:2px solid var(--border)}
.toc a:hover{color:var(--text); text-decoration:none}
.toc a.on{color:var(--accent); border-left-color:var(--accent); font-weight:600}
.doc main > section{padding:56px 0; scroll-margin-top:64px}
.doc main > section + section{border-top:1px solid var(--border)}
@media (max-width:1000px){
  .doc{grid-template-columns:minmax(0,1fr); gap:0}
  .toc{z-index:15; display:flex; gap:4px; overflow-x:auto; padding:8px 0; margin:0 -16px; padding-left:16px;
    background:color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter:blur(10px);
    border-bottom:1px solid var(--border)}
  .toc .tt{display:none}
  .toc a{flex:0 0 auto; border-left:none; border-radius:8px; padding:5px 10px; white-space:nowrap}
  .toc a.on{background:var(--accent-soft)}
  .doc main > section{scroll-margin-top:104px}
}

/* recruiter-facing hero: text and key numbers beside the animation */
.hero-grid{display:grid; grid-template-columns:minmax(0,1.15fr) minmax(0,1fr); gap:44px; align-items:center}
.hero-grid .demo{margin:0; max-width:none}
.hero .byline{color:var(--text); font-weight:600; margin:-8px 0 22px}
.stats{display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin:0 0 26px}
.stat{background:var(--surface); border:1px solid var(--border); border-radius:12px; padding:12px 14px}
.stat b{display:block; font-size:1.6rem; font-weight:800; letter-spacing:-.02em; color:var(--accent); line-height:1.1}
.stat span{display:block; font-size:.8rem; color:var(--muted); line-height:1.35; margin-top:4px}
@media (max-width:900px){ .hero-grid{grid-template-columns:minmax(0,1fr); gap:28px} }
@media (max-width:480px){ .stats{grid-template-columns:1fr} }

/* fold-away detail */
details.more{border:1px solid var(--border); border-radius:12px; background:var(--surface); margin:16px 0 20px}
details.more > summary{cursor:pointer; list-style:none; padding:14px 18px; font-weight:650; font-size:.95rem; color:var(--accent);
  display:flex; justify-content:space-between; gap:12px; align-items:center}
details.more > summary::-webkit-details-marker{display:none}
details.more > summary::after{content:"+"; font-size:1.2rem; color:var(--muted)}
details.more[open] > summary::after{content:"\2212"}
details.more[open] > summary{border-bottom:1px solid var(--border)}
details.more > :not(summary){margin-left:16px; margin-right:16px}
details.more > :last-child{margin-bottom:16px}

/* cards and skills inside prose sections keep their own compact spacing */
.prose .card h3{margin:0 0 8px}
.card .tag-mini{display:block}
.prose .skills h4{margin:2px 0 2px}

/* animated message-passing figure (V4) */
.ga-halo{fill:var(--heat); fill-opacity:.2; stroke:var(--heat); stroke-width:1.5; transition:opacity .6s ease}
.ga-msg{fill:var(--accent-2)}
.ga-bar{display:flex; align-items:center; gap:12px; margin-top:10px}
.ga-btn{font:inherit; font-size:13px; padding:3px 12px; border-radius:999px; border:1px solid var(--border); background:var(--surface); color:var(--text); cursor:pointer}
.ga-dots{display:flex; gap:6px}
.ga-dots button{width:10px; height:10px; padding:0; border:0; border-radius:50%; background:var(--border); cursor:pointer; transition:background .3s}
.ga-dots button.on{background:var(--accent)}
.ga-btn:disabled{opacity:.4; cursor:default}
.ga-btn:not(:disabled):hover{border-color:var(--accent); color:var(--accent)}
.ga-count{margin-left:auto; font-size:13px; color:var(--muted)}
.ga-cap{min-height:4.6em; margin:10px 0 4px; color:var(--text)}
@media (prefers-reduced-motion: reduce){.ga-halo,.ga-dots button{transition:none}}
.ga-tray{fill:none; stroke:var(--border); stroke-dasharray:5 4}
#gnn-anim svg .ga-lab{paint-order:stroke; stroke:var(--surface); stroke-width:5px; stroke-linejoin:round}
.cv-in{fill:var(--muted)}
.cv-off{fill:var(--surface-2); fill-opacity:.92}
.cv-mac{fill:none; stroke:var(--macro); stroke-width:2}
.cv-cell{fill:none; stroke:var(--text); stroke-width:2}
.cv-mini{fill:none; stroke:var(--muted); stroke-width:1}
.cv-minigrid{fill:none; stroke:var(--surface); stroke-width:1}
/* step-through figures: shrink to fit on phones so both panels stay visible */
#gnn-anim svg, #conv-anim svg{min-width:0}
.ga-bar{flex-wrap:wrap}
.ga-btn, .ga-count{white-space:nowrap}

/* Editorial theme: display serif for headings */
h1,h2,h3,h4,.brand{font-family:Fraunces,Georgia,serif}

/* header links with their brand marks */
.brand{white-space:nowrap}
.nav .btn{white-space:nowrap}
.nav .btn{display:inline-flex; align-items:center; gap:7px}
.nav .btn .ico{width:15px; height:15px; flex:none}
@media (max-width:640px){ .nav nav{gap:8px} .nav .wrap{gap:10px} .nav .btn{padding:6px 10px} }
@media (max-width:420px){ .nav .btn .lbl{display:none} .nav .btn{padding:7px 9px} }