/* ============================================================
   Theonics — site stylesheet
   Palette is the canonical brand library (assets/brand/palette.md):
   role-based, theme-aware. Nothing off-palette ships.
   ============================================================ */

:root{
  /* brand roles — LIGHT */
  --ink:#20202e;
  --muted:#77728a;
  --gold:#a9791f;
  --ground:#ffffff;
  /* derived surfaces (kept in-family, low-chroma) */
  --ground-2:#f6f4ef;
  --hair:rgba(119,114,138,.22);
  --gold-wash:rgba(169,121,31,.08);
  /* type */
  --serif:Georgia,"Times New Roman",Times,serif;
  --sans:"Segoe UI",system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;
  /* metrics */
  --measure:66ch;
  --pad:clamp(1.25rem,4vw,3rem);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ink:#ece7dd; --muted:#a29bb0; --gold:#d8b25a; --ground:#1b1b26;
    --ground-2:#20202e; --hair:rgba(162,155,176,.22); --gold-wash:rgba(216,178,90,.10);
  }
}
:root[data-theme="dark"]{
  --ink:#ece7dd; --muted:#a29bb0; --gold:#d8b25a; --ground:#1b1b26;
  --ground-2:#20202e; --hair:rgba(162,155,176,.22); --gold-wash:rgba(216,178,90,.10);
}
:root[data-theme="light"]{
  --ink:#20202e; --muted:#77728a; --gold:#a9791f; --ground:#ffffff;
  --ground-2:#f6f4ef; --hair:rgba(119,114,138,.22); --gold-wash:rgba(169,121,31,.08);
}

/* rubric red — the red-letter accent for chapter numerals */
:root{ --rubric:#a6342b; }
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){ --rubric:#df8a7d; } }
:root[data-theme="dark"]{ --rubric:#df8a7d; }
:root[data-theme="light"]{ --rubric:#a6342b; }

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0; background:var(--ground); color:var(--ink);
  font-family:var(--serif); font-size:clamp(1.02rem,.55rem + .9vw,1.18rem);
  line-height:1.72; letter-spacing:.005em;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
}
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto} }

/* ---------- rhythm ---------- */
.wrap{max-width:72rem;margin-inline:auto;padding-inline:var(--pad)}
.measure{max-width:var(--measure)}
section{padding-block:clamp(3.5rem,8vw,6.5rem)}
.rule{height:1px;border:0;background:var(--hair);margin:0}

/* ---------- type ---------- */
h1,h2,h3{font-weight:600;line-height:1.14;letter-spacing:-.01em;margin:0 0 .6em}
h1{font-size:clamp(2.4rem,1.4rem + 3.6vw,4.2rem)}
h2{font-size:clamp(1.7rem,1.1rem + 2.1vw,2.7rem)}
h3{font-size:clamp(1.2rem,.95rem + 1vw,1.5rem)}
p{margin:0 0 1.15em}
a{color:var(--gold);text-underline-offset:.18em;text-decoration-thickness:.06em}
.eyebrow{
  font-family:var(--sans);font-size:.74rem;font-weight:600;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gold);margin:0 0 1.1em
}
.lede{font-size:1.22em;color:var(--ink)}
.muted{color:var(--muted)}
.gold{color:var(--gold)}
.creed{font-style:italic;color:var(--gold)}
em{font-style:italic}
strong{font-weight:600}
.big-first::first-letter{
  font-size:3.1em;line-height:.8;float:left;padding:.06em .12em .02em 0;color:var(--gold);
}

/* ---------- header / nav ---------- */
.site-head{
  position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--ground) 86%,transparent);
  backdrop-filter:saturate(1.1) blur(9px);border-bottom:1px solid var(--hair)
}
.site-head .wrap{display:flex;align-items:center;gap:1rem;height:64px}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--ink);font-weight:600}
.brand img{width:26px;height:29px;display:block}
.brand .name{font-size:1.15rem;letter-spacing:.01em}
.nav{margin-left:auto;display:flex;gap:1.4rem;align-items:center}
.nav a{font-family:var(--sans);font-size:.85rem;color:var(--muted);text-decoration:none;letter-spacing:.02em}
.nav a:hover{color:var(--ink)}
@media (max-width:680px){ .nav .hide-sm{display:none} }
.theme-toggle{
  font-family:var(--sans);font-size:.8rem;color:var(--muted);background:transparent;
  border:1px solid var(--hair);border-radius:999px;padding:.35rem .7rem;cursor:pointer;line-height:1
}
.theme-toggle:hover{color:var(--ink);border-color:var(--muted)}

/* ---------- hero ---------- */
.hero{padding-top:clamp(1.4rem,3vw,2.4rem);padding-bottom:clamp(1.8rem,4vw,3rem);text-align:left}
.hero-lockup{display:flex;align-items:center;gap:clamp(1rem,3vw,2.4rem)}
.hero .mark{max-width:min(150px,26vw);width:100%;margin:0;display:block;flex:none}
.hero-head{min-width:0}
.hero h1{margin:.05em 0;font-size:clamp(2.4rem,1.4rem + 3.4vw,4rem)}
.hero .eyebrow{margin-bottom:.5em}
.hero .creed{font-size:1.1rem;margin-top:.3em}
.hero .lede{max-width:52ch;margin:1.4rem 0 0}
.hero .btnrow{justify-content:flex-start;margin-top:1.4rem}
@media (max-width:560px){
  .hero-lockup{flex-direction:column;align-items:flex-start;gap:.6rem}
  .hero .mark{max-width:120px}
}
.scroll-cue{margin-top:2.6rem;font-family:var(--sans);font-size:.78rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted)}

/* ---------- statement band ---------- */
.band{background:var(--ground-2)}
.statement{font-size:clamp(1.5rem,1rem + 2vw,2.3rem);line-height:1.32;font-weight:500;max-width:24ch}
.statement .gold{white-space:nowrap}

/* ---------- ELI5 idea blocks ---------- */
.ideas{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(1.5rem,3vw,2.5rem);
  margin-top:2rem}
.idea{padding:clamp(1.4rem,2.5vw,2rem);border:1px solid var(--hair);border-radius:6px;
  background:var(--panel)}
.idea h3{margin-bottom:.35em}
.idea .body{max-width:none}
.idea .take{color:var(--muted);font-style:italic;font-size:.85rem;margin:0}
@media (max-width:640px){ .ideas{grid-template-columns:1fr} }

/* ---------- pull / aside ---------- */
.pull{border-left:3px solid var(--gold);padding:.2rem 0 .2rem 1.2rem;margin:1.8rem 0;
  font-size:1.12em;color:var(--ink)}

/* ---------- science shift cards ---------- */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1rem,2.5vw,1.8rem)}
@media (max-width:720px){ .grid2{grid-template-columns:1fr} }
.card{background:var(--ground-2);border:1px solid var(--hair);border-radius:14px;
  padding:clamp(1.3rem,3vw,1.9rem)}
.card h3{color:var(--ink)}
.card .old{color:var(--muted)}
.card .new{color:var(--ink)}
.tag{display:inline-block;font-family:var(--sans);font-size:.68rem;font-weight:700;letter-spacing:.12em;
  text-transform:uppercase;padding:.2rem .5rem;border-radius:6px;margin-bottom:.9rem}
.tag.was{color:var(--muted);background:var(--hair)}
.tag.now{color:var(--gold);background:var(--gold-wash)}

/* ---------- the mark section ---------- */
.mark-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:clamp(1.5rem,4vw,3rem);align-items:center}
@media (max-width:800px){ .mark-grid{grid-template-columns:1fr} }
.mark-grid img{width:100%;max-width:420px;margin-inline:auto;display:block}
.glyphrow{display:flex;gap:.4rem;flex-wrap:wrap;margin-top:1.2rem}
.glyphrow .g{font-family:var(--sans);font-size:.72rem;color:var(--muted);
  border:1px solid var(--hair);border-radius:8px;padding:.35rem .6rem}
.glyphrow .g b{color:var(--gold);font-weight:700}

/* ---------- equation chip ---------- */
.eq{font-family:var(--serif);font-style:italic;font-size:1.3em;color:var(--ink);
  background:var(--gold-wash);border:1px solid var(--hair);border-radius:10px;
  padding:.5rem .9rem;display:inline-block}
.eq b{color:var(--gold);font-style:normal}

/* ---------- CTA ---------- */
.cta{text-align:center}
.cta .creed{font-size:1.25rem}
.btnrow{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap;margin-top:1.8rem}
.btn{font-family:var(--sans);font-size:.9rem;font-weight:600;letter-spacing:.02em;text-decoration:none;
  padding:.7rem 1.3rem;border-radius:999px;border:1px solid var(--gold);color:var(--gold);
  background:transparent;transition:background .15s,color .15s}
.btn:hover{background:var(--gold-wash)}
.btn.solid{background:var(--gold);color:var(--ground)}
.btn.solid:hover{opacity:.9}

/* ---------- footer ---------- */
.site-foot{border-top:1px solid var(--hair);background:var(--ground-2)}
.site-foot .wrap{display:flex;gap:1rem;flex-wrap:wrap;align-items:center;
  padding-block:2rem;font-family:var(--sans);font-size:.82rem;color:var(--muted)}
.site-foot .creed{margin-left:auto;font-family:var(--serif)}

/* ---------- book / reader ---------- */
.book{padding-block:clamp(2rem,5vw,3.5rem)}
.book .kicker{display:flex;gap:.8rem;align-items:baseline;margin-bottom:.4rem}
.book .chnum{font-family:var(--sans);font-weight:700;font-size:.8rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--gold)}
.book article{max-width:var(--measure)}
.book article h1{font-size:clamp(2rem,1.3rem + 2.4vw,3.1rem);margin-bottom:.2em}
.book .subtitle{font-style:italic;color:var(--muted);font-size:1.15em;margin:.2em 0 1.8em}
.book article h2{margin-top:1.9em;font-size:clamp(1.3rem,1rem + 1.2vw,1.7rem)}
.book article p{margin:0 0 1.1em}
.book article ul{margin:0 0 1.2em;padding-left:1.2em}
.book article li{margin:.35em 0}
.book article blockquote{margin:1.7rem 0;padding:1rem 1.2rem;border-left:3px solid var(--gold);
  background:var(--gold-wash);border-radius:0 10px 10px 0;color:var(--ink)}
.book article blockquote p:last-child{margin-bottom:0}
.book article table{width:100%;border-collapse:collapse;margin:1.4rem 0;font-size:.95em}
.book article th,.book article td{text-align:left;padding:.5rem .7rem;border-bottom:1px solid var(--hair)}
.book article th{font-family:var(--sans);font-size:.8rem;letter-spacing:.03em;color:var(--muted)}
.book article code{font-family:ui-monospace,"Cascadia Code",Consolas,monospace;font-size:.92em;
  background:var(--ground-2);border:1px solid var(--hair);border-radius:5px;padding:.08em .4em}
.book-toc{list-style:none;padding:0;margin:1.5rem 0 0;counter-reset:toc}
.book-toc li{border-top:1px solid var(--hair)}
.book-toc li:last-child{border-bottom:1px solid var(--hair)}
.book-toc a{display:grid;grid-template-columns:3rem 1fr;gap:1rem;align-items:baseline;
  padding:1rem .3rem;text-decoration:none;color:var(--ink)}
.book-toc a:hover{background:var(--gold-wash)}
.book-toc .n{font-family:var(--sans);font-weight:700;color:var(--gold);font-size:.9rem}
.book-toc .t{font-weight:600;font-size:1.1rem}
.book-toc .d{grid-column:2;color:var(--muted);font-size:.95rem;margin-top:.15rem}
.book-nav{display:flex;justify-content:space-between;gap:1rem;margin-top:3rem;
  padding-top:1.4rem;border-top:1px solid var(--hair);max-width:var(--measure)}
.book-nav a{font-family:var(--sans);font-size:.9rem;text-decoration:none;color:var(--muted);
  display:flex;flex-direction:column;gap:.15rem;max-width:45%}
.book-nav a:hover{color:var(--gold)}
.book-nav .lab{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.book-nav a.next{text-align:right;margin-left:auto}
.book-nav .ttl{color:var(--ink);font-weight:600}

/* ---------- library ---------- */
.lib-head{padding-block:clamp(2.4rem,6vw,4rem) 1rem}
.lib-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:clamp(1rem,2.5vw,1.6rem);
  padding-bottom:clamp(3rem,8vw,5rem)}
.lib-card{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);
  background:var(--ground-2);border:1px solid var(--hair);border-radius:14px;overflow:hidden;
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
.lib-card:hover{transform:translateY(-3px);border-color:var(--gold);
  box-shadow:0 18px 40px -24px rgba(0,0,0,.5)}
.lib-cover{aspect-ratio:16/7;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(120% 140% at 50% 0%,var(--gold-wash),transparent 70%);border-bottom:1px solid var(--hair)}
.lib-cover img{width:64px;height:auto;display:block}
.lib-meta{padding:clamp(1.1rem,3vw,1.5rem)}
.lib-meta h2{font-size:1.35rem;margin:.1em 0 .4em}
.lib-open{display:inline-block;margin-top:1rem;font-family:var(--sans);font-size:.85rem;
  font-weight:600;color:var(--gold)}
.lib-soon{opacity:.55;pointer-events:none}
.lib-soon .lib-open{color:var(--muted)}

/* ============================================================
   BOOK READER — paginated flip-book (/read)
   ============================================================ */
.reader{position:fixed;inset:0;top:64px;display:flex;flex-direction:column;
  background:var(--ground-2);overflow:hidden}
.stage{position:relative;flex:1 1 auto;min-height:0;display:flex;align-items:center;
  justify-content:center;padding:clamp(.6rem,2.2vh,1.6rem) clamp(.4rem,3vw,2rem)}
.book{position:relative;height:100%;width:100%;max-width:1080px;background:var(--ground);
  border:1px solid var(--hair);border-radius:8px;overflow:hidden;
  box-shadow:0 18px 50px -24px rgba(0,0,0,.55),0 2px 8px -4px rgba(0,0,0,.35)}
/* single-page mode: one comfortably-narrow page, centred (no full-width lines) */
.book.single{max-width:660px}
.book.spread::before{content:"";position:absolute;top:0;bottom:0;left:50%;width:44px;
  transform:translateX(-50%);pointer-events:none;z-index:3;
  background:linear-gradient(90deg,transparent,rgba(0,0,0,.05) 44%,rgba(0,0,0,.09) 50%,rgba(0,0,0,.05) 56%,transparent)}
:root:not([data-theme="light"]) .book.spread::before,
:root[data-theme="dark"] .book.spread::before{
  background:linear-gradient(90deg,transparent,rgba(0,0,0,.28) 44%,rgba(0,0,0,.42) 50%,rgba(0,0,0,.28) 56%,transparent)}
.leaves{--pm:clamp(1.4rem,3.6vw,2.9rem);height:100%;padding:clamp(1.4rem,3.6vh,2.8rem) 0;
  column-fill:auto;text-align:justify;hyphens:auto;-webkit-hyphens:auto;
  transition:transform .5s cubic-bezier(.22,.61,.36,1);will-change:transform}
.leaves.no-anim{transition:none}
/* page side-margins live on the text blocks (NOT the columned container) so the
   overflow clip lands exactly on the column edge — no next-page bleed */
.leaves .chap-open,.leaves p,.leaves h2{padding-left:var(--pm);padding-right:var(--pm)}
.leaves ul{padding-left:calc(var(--pm) + 1.2em);padding-right:var(--pm)}

/* content inside the flowing columns */
.leaves .chap{break-before:column;-webkit-column-break-before:always}
.leaves .chap:first-child{break-before:auto}
.leaves .chap-open{margin:.3rem 0 1.5rem;text-align:center;break-after:avoid}
.leaves .chap-open .chnum{font-family:var(--sans);font-weight:700;font-size:.72rem;
  letter-spacing:.22em;text-transform:uppercase;color:var(--gold);margin:0 0 .8rem}
.leaves .chap-open h2{font-size:clamp(1.5rem,1rem + 1.8vw,2.1rem);line-height:1.15;margin:0 0 .3rem;
  letter-spacing:-.01em;text-align:center}
.leaves .chap-open .subtitle{font-style:italic;color:var(--muted);font-size:1.02em;margin:.2rem 0 0}
.leaves .chap-open .orn{color:var(--gold);letter-spacing:.4em;margin-top:1rem;font-size:.9rem}
.leaves h2{font-size:1.12rem;margin:1.5em 0 .5em;text-align:left;break-after:avoid;
  font-family:var(--sans);letter-spacing:.01em}
.leaves p{margin:0 0 .95em;line-height:1.66;font-size:clamp(1rem,.55rem + .5vw,1.08rem)}
.leaves .chap-body > p:first-of-type::first-letter{font-size:3.05em;line-height:.82;float:left;
  padding:.02em .1em 0 0;color:var(--gold);font-weight:600}
.leaves ul{margin:0 0 1em;padding-left:1.15em}
.leaves li{margin:.3em 0;line-height:1.6}
.leaves blockquote{margin:1.3rem var(--pm);padding:.7rem 1rem;border-left:3px solid var(--gold);
  background:var(--gold-wash);border-radius:0 8px 8px 0;break-inside:avoid;text-align:left}
.leaves blockquote p{margin:0}
.leaves code{font-family:ui-monospace,Consolas,monospace;font-size:.92em;background:var(--ground-2);
  border:1px solid var(--hair);border-radius:5px;padding:.06em .35em}
.leaves .take{color:var(--muted);font-style:italic}
.leaves hr{border:0;border-top:1px solid var(--hair);margin:1.4em var(--pm)}

/* turn zones + arrows */
.edge{position:absolute;top:0;bottom:0;width:26%;border:0;background:transparent;cursor:pointer;
  z-index:4;display:flex;align-items:center;-webkit-tap-highlight-color:transparent}
.edge.prev{left:0;justify-content:flex-start;padding-left:.4rem}
.edge.next{right:0;justify-content:flex-end;padding-right:.4rem}
.edge span{font-family:var(--sans);font-size:1.7rem;line-height:1;color:var(--muted);opacity:0;
  transition:opacity .2s;background:var(--ground);border:1px solid var(--hair);border-radius:999px;
  width:2.2rem;height:2.2rem;display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px -6px rgba(0,0,0,.5)}
.edge:hover span,.edge:focus-visible span{opacity:1}
.edge:disabled{cursor:default}.edge:disabled span{opacity:0!important}
@media (hover:none){.edge span{opacity:.55}}

/* footer control bar */
.reader-foot{flex:0 0 auto;display:flex;align-items:center;gap:1rem;
  padding:.55rem clamp(.8rem,3vw,2rem);border-top:1px solid var(--hair);background:var(--ground);
  font-family:var(--sans);font-size:.82rem;color:var(--muted)}
.reader-foot .chapbtn{font-family:var(--sans);font-size:.82rem;color:var(--ink);background:transparent;
  border:1px solid var(--hair);border-radius:999px;padding:.35rem .8rem;cursor:pointer}
.reader-foot .chapbtn:hover{border-color:var(--gold);color:var(--gold)}
.reader-foot .chaptitle{color:var(--ink);font-weight:600;white-space:nowrap;overflow:hidden;
  text-overflow:ellipsis}
.reader-foot .folio{margin-left:auto;font-variant-numeric:tabular-nums;white-space:nowrap}
.reader-progress{position:absolute;left:0;top:0;height:2px;background:var(--gold);width:0;
  transition:width .5s cubic-bezier(.22,.61,.36,1);z-index:5}

/* contents popover */
.toc-pop{position:absolute;left:clamp(.8rem,3vw,2rem);bottom:3.1rem;z-index:20;
  background:var(--ground);border:1px solid var(--hair);border-radius:12px;padding:.5rem;
  box-shadow:0 20px 50px -20px rgba(0,0,0,.6);max-height:70vh;overflow:auto;
  min-width:min(320px,80vw);display:none}
.toc-pop.open{display:block}
.toc-pop button{display:grid;grid-template-columns:2rem 1fr;gap:.6rem;align-items:baseline;width:100%;
  text-align:left;background:transparent;border:0;border-radius:8px;padding:.6rem .5rem;cursor:pointer;
  color:var(--ink);font-family:var(--serif)}
.toc-pop button:hover{background:var(--gold-wash)}
.toc-pop .n{font-family:var(--sans);font-weight:700;color:var(--gold);font-size:.85rem}
.toc-pop .t{font-weight:600}
.toc-pop .d{grid-column:2;color:var(--muted);font-size:.85rem;margin-top:.1rem;font-family:var(--sans)}

/* ============================================================
   BOOKCASE — searchable left document list + section landing
   ============================================================ */
.bookcase{display:grid;grid-template-columns:minmax(230px,290px) minmax(0,1fr);
  gap:clamp(1.5rem,4vw,3.5rem);align-items:start;max-width:70rem;margin-inline:auto;
  padding-block:clamp(1.4rem,4vw,2.6rem)}
.bc-side{position:sticky;top:80px;align-self:start}
.bc-search-wrap{position:relative;margin-bottom:.7rem}
.bc-search-wrap svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--muted);
  pointer-events:none}
#bc-search{width:100%;background:var(--ground-2);border:1px solid var(--hair);border-radius:8px;
  padding:.55rem .7rem .55rem 2rem;color:var(--ink);font-family:var(--sans);font-size:.85rem;outline:none}
#bc-search:focus{border-color:var(--gold)}
.bc-search-clear{position:absolute;right:8px;top:50%;transform:translateY(-50%);color:var(--muted);
  cursor:pointer;display:none;font-size:15px;line-height:1;padding:2px 6px;border-radius:4px;background:none;border:0}
.bc-search-clear:hover{color:var(--gold);background:var(--gold-wash)}
.bc-allcheck{display:flex;align-items:center;gap:.5rem;font-family:var(--sans);font-size:.76rem;
  color:var(--muted);margin:0 0 1.1rem;padding-left:.2rem;cursor:pointer;user-select:none}
.bc-allcheck input{accent-color:var(--gold);cursor:pointer}
.bc-cat{font-family:var(--sans);font-size:.7rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:var(--muted);margin:1.2rem .2rem .5rem;display:flex;align-items:baseline;gap:.5rem}
.bc-cat:first-child{margin-top:0}
.bc-cat .c{color:var(--gold);opacity:.7;font-weight:400}
.bc-list{list-style:none;margin:0 0 .4rem;padding:0;display:flex;flex-direction:column;gap:.05rem}
.bc-doc{display:flex;align-items:center;gap:.5rem;justify-content:space-between;text-decoration:none;
  color:var(--muted);font-family:var(--sans);font-size:.88rem;line-height:1.3;padding:.45rem .6rem;
  border-radius:8px;border-left:2px solid transparent}
.bc-doc:hover{color:var(--ink);background:var(--gold-wash)}
.bc-doc.current{color:var(--ink);border-left-color:var(--gold);background:var(--gold-wash)}
.bc-doc .bc-t{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bc-doc .bc-bk{font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gold);
  border:1px solid var(--hair);border-radius:4px;padding:0 4px;flex:none}
.bc-doc.soon{opacity:.5;pointer-events:none}
.bc-dl{flex:none;color:var(--muted);opacity:.6;display:inline-flex}
.bc-dl:hover{opacity:1;color:var(--gold)}
.bc-hit{background:var(--gold-wash);color:var(--gold);border-radius:2px;padding:0 1px}
.bc-none{padding:1rem .4rem;color:var(--muted);font-family:var(--sans);font-size:.85rem;font-style:italic}
.bc-main{min-width:0;max-width:var(--measure)}
@media (max-width:820px){
  .bookcase{grid-template-columns:1fr;gap:1.2rem}
  .bc-side{position:static;border:1px solid var(--hair);border-radius:12px;padding:.7rem}
}

/* ---------- glossary term tooltip (hover definitions) ---------- */
.term-def{border-bottom:1px dotted var(--gold);cursor:help;text-decoration:none;color:inherit;
  position:relative}
.term-def:focus{outline:2px solid var(--gold);outline-offset:2px}
.term-def::after{content:attr(data-def);position:absolute;left:0;bottom:calc(100% + 8px);z-index:60;
  width:max-content;max-width:min(320px,80vw);background:var(--ground-2);color:var(--ink);
  border:1px solid var(--hair);border-radius:8px;padding:.55rem .7rem;font-family:var(--sans);
  font-size:.8rem;font-style:normal;line-height:1.5;font-weight:400;letter-spacing:normal;
  box-shadow:0 12px 30px -12px rgba(0,0,0,.5);opacity:0;visibility:hidden;transform:translateY(4px);
  transition:opacity .15s,transform .15s;pointer-events:none}
.term-def::before{content:"";position:absolute;left:14px;bottom:calc(100% + 3px);z-index:61;
  border:5px solid transparent;border-top-color:var(--hair);opacity:0;visibility:hidden;transition:opacity .15s}
.term-def:hover::after,.term-def:focus::after{opacity:1;visibility:visible;transform:translateY(0)}
.term-def:hover::before,.term-def:focus::before{opacity:1;visibility:visible}

/* ============================================================
   DOCS READER — regular pages, left chapter list, prev/next
   ============================================================ */
.doc{display:grid;grid-template-columns:minmax(200px,240px) minmax(0,1fr);
  gap:clamp(1.5rem,4vw,3.5rem);align-items:start;max-width:66rem;margin-inline:auto;
  padding-block:clamp(1.4rem,4vw,2.6rem)}
.doc-side{position:sticky;top:80px;align-self:start}
.doc-side .side-lbl{font-family:var(--sans);font-size:.72rem;font-weight:700;letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted);margin:0 0 .7rem;padding-left:.6rem}
.doc-toc{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.05rem}
.doc-toc a{display:flex;gap:.55rem;align-items:baseline;text-decoration:none;color:var(--muted);
  font-family:var(--sans);font-size:.9rem;line-height:1.3;padding:.42rem .6rem;border-radius:8px;
  border-left:2px solid transparent}
.doc-toc a:hover{color:var(--ink);background:var(--gold-wash)}
.doc-toc a.current{color:var(--ink);border-left-color:var(--gold);background:var(--gold-wash);font-weight:600}
.doc-toc .n{font-size:.82rem;color:var(--rubric);font-weight:700;min-width:2.5em;
  font-family:var(--serif);letter-spacing:.02em}
.rubric{color:var(--rubric);font-weight:700;font-style:normal}
.doc-main{min-width:0;max-width:var(--measure)}
.doc-main .chnum{font-family:var(--sans);font-weight:700;font-size:.74rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--gold);margin:0 0 .5rem}
.doc-main h1{font-size:clamp(1.9rem,1.3rem + 2.2vw,2.9rem);margin-bottom:.12em;line-height:1.12}
.doc-main .subtitle{font-style:italic;color:var(--muted);font-size:1.12em;margin:.15em 0 1.7em}
.doc-main h2{margin-top:1.9em;font-size:clamp(1.3rem,1rem + 1.2vw,1.7rem)}
.doc-main p{margin:0 0 1.1em}
.doc-main ul{margin:0 0 1.2em;padding-left:1.2em}
.doc-main li{margin:.35em 0}
.doc-main blockquote{margin:1.7rem 0;padding:1rem 1.2rem;border-left:3px solid var(--gold);
  background:var(--gold-wash);border-radius:0 10px 10px 0;color:var(--ink)}
.doc-main blockquote p:last-child{margin-bottom:0}
.doc-main code{font-family:ui-monospace,"Cascadia Code",Consolas,monospace;font-size:.92em;
  background:var(--ground-2);border:1px solid var(--hair);border-radius:5px;padding:.08em .4em}
.doc-main .big-first::first-letter{font-size:3.1em;line-height:.8;float:left;padding:.06em .12em .02em 0;color:var(--gold)}
/* prev · contents · next */
.doc-nav{display:flex;align-items:stretch;gap:.8rem;margin-top:2.8rem;padding-top:1.4rem;
  border-top:1px solid var(--hair)}
.doc-nav a{font-family:var(--sans);font-size:.9rem;text-decoration:none;color:var(--muted);
  display:flex;flex-direction:column;gap:.15rem;padding:.6rem .95rem;border:1px solid var(--hair);
  border-radius:10px;transition:border-color .15s,color .15s;flex:1 1 0;min-width:0}
.doc-nav a:hover{border-color:var(--gold);color:var(--gold)}
.doc-nav a.next{text-align:right;align-items:flex-end}
.doc-nav a.contents{flex:0 0 auto;justify-content:center;align-items:center;color:var(--muted)}
.doc-nav a.disabled{opacity:.35;pointer-events:none}
.doc-nav .lab{font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.doc-nav .ttl{color:var(--ink);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
.doc-nav a:hover .ttl{color:var(--gold)}
@media (max-width:820px){
  .doc{grid-template-columns:1fr;gap:1.2rem}
  .doc-side{position:static;border:1px solid var(--hair);border-radius:12px;padding:.5rem}
  .doc-nav a.contents{display:none}
  .doc-nav .ttl{white-space:normal}
}

/* ============================================================
   TYPE STANDARD — the shared HTML heading hierarchy
   Used by the reader, articles, Codex, and doc pages so every
   prose page breaks the same way. (The LaTeX PDF is separate and
   keeps its own scientific template.)
   Levels:  eyebrow (gold kicker)  >  h2 (section, ruled)  >  h3
            (subsection, gold sans)  >  body (serif ink)
   ============================================================ */
.book article h3, .doc-main h3, .codex-panel h3{
  font-family:var(--sans); font-weight:700; color:var(--gold);
  font-size:.82rem; letter-spacing:.14em; line-height:1.42; text-transform:uppercase;
  margin:2.3rem 0 .6rem;
}
.book article h2, .doc-main h2{
  border-top:1px solid var(--hair); padding-top:1.5rem; margin-top:2.7rem;
}

/* ---------- reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){ .reveal{opacity:1;transform:none;transition:none} }