/* ==========================================================================
   Landau Lab — shared Meridian stylesheet for inner pages
   Tokens, header and footer mirror the homepage (index.html keeps its own
   inline copy). Inner-page components live below the shared block.
   ========================================================================== */

:root{
  --paper:#f5f2ec;
  --paper-2:#faf8f3;
  --card:#ffffff;
  --ink:#1b1a16;
  --ink-soft:#413e37;
  --muted:#6f6b61;
  --line:#e2ddd1;
  --line-strong:#d0cabb;
  --accent:#2e585f;
  --accent-deep:#22434a;
  --accent-soft:rgba(46,88,95,.08);
  --accent-line:rgba(46,88,95,.30);
  --sand:#a9864f;            /* secondary data colour (non-displaceable, "next") */
  --sand-soft:rgba(169,134,79,.10);
  --sand-line:rgba(169,134,79,.38);
  --slate:#8b8c86;           /* tertiary data colour (blood) */

  --serif:"Spectral",Georgia,"Times New Roman",serif;
  --sans:"Libre Franklin",Helvetica,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;

  --wrap:1140px;
  --gutter:clamp(1.25rem,5vw,4rem);
  --radius:4px;
  --measure:40rem;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);
  font-size:clamp(1rem,.97rem + .18vw,1.075rem);
  line-height:1.65;font-weight:400;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--serif);font-weight:400;line-height:1.14;letter-spacing:-.01em;color:var(--ink);margin:0}
p{margin:0}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
sup,sub{line-height:0}

.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.rule{height:1px;background:var(--line);border:0;margin:0}

.eyebrow{
  font-family:var(--mono);font-size:.72rem;font-weight:500;letter-spacing:.22em;
  text-transform:uppercase;color:var(--muted);
  display:flex;align-items:center;gap:.7rem;flex-wrap:wrap;
}
.eyebrow .idx{color:var(--accent)}
.eyebrow::before{content:"";width:1.6rem;height:1px;background:var(--line-strong)}
.eyebrow a{color:var(--muted);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.eyebrow a:hover{color:var(--accent-deep);border-bottom-color:var(--accent-line)}
.eyebrow .sep{color:var(--line-strong)}

a:focus-visible,button:focus-visible,[tabindex]:focus-visible,summary:focus-visible,input:focus-visible{
  outline:2px solid var(--accent);outline-offset:3px;border-radius:2px;
}
.skip{
  position:absolute;left:.75rem;top:-4rem;z-index:200;
  background:var(--ink);color:var(--paper);
  padding:.6rem 1rem;border-radius:var(--radius);font-size:.85rem;
  transition:top .2s ease;
}
.skip:focus{top:.75rem}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- header / nav (identical to homepage) ---------- */
header.site{
  position:sticky;top:0;z-index:100;
  background:var(--paper);
  background:color-mix(in srgb,var(--paper) 90%,transparent);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  border-bottom:1px solid transparent;
  transition:border-color .3s ease,background .3s ease;
}
header.site.scrolled{border-bottom-color:var(--line);background:color-mix(in srgb,var(--paper) 95%,transparent)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;height:72px}
.brand{display:inline-flex;align-items:center;gap:.68rem}
.brand .wordmark{font-family:var(--sans);font-size:.93rem;font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--ink);line-height:1}
.brand-emblem{display:block;flex:none;width:49px;height:47px;object-fit:contain}
.nav-links{display:flex;align-items:center;gap:.2rem}
.nav-links a{
  font-size:.92rem;color:var(--ink-soft);
  padding:.5rem .72rem;border-radius:var(--radius);
  position:relative;transition:color .2s ease;
}
.nav-links a::after{
  content:"";position:absolute;left:.72rem;right:.72rem;bottom:.32rem;height:1px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .28s ease;
}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after,.nav-links a[aria-current="page"]::after{transform:scaleX(1)}
.nav-links a[aria-current="page"]{color:var(--ink)}
.nav-links a.cta{color:var(--accent-deep);border:1px solid var(--line-strong);margin-left:.5rem}
.nav-links a.cta::after{display:none}
.nav-links a.cta:hover{border-color:var(--accent);background:var(--accent-soft)}
.nav-toggle{
  display:none;align-items:center;justify-content:center;
  width:42px;height:42px;background:transparent;border:1px solid var(--line-strong);
  border-radius:var(--radius);cursor:pointer;color:var(--ink);
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:18px;height:1.5px;background:currentColor;
  transition:transform .25s ease,opacity .2s ease;
}
.nav-toggle span::before{transform:translateY(-6px)}
.nav-toggle span::after{transform:translateY(4.5px)}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:translateY(0) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:translateY(-1.5px) rotate(-45deg)}
@media (max-width:860px){
  .nav-toggle{display:inline-flex}
  .nav-links{
    position:absolute;left:0;right:0;top:72px;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
    padding:.6rem var(--gutter) 1rem;display:none;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:.85rem .2rem;font-size:1rem;border-bottom:1px solid var(--line)}
  .nav-links a::after{display:none}
  .nav-links a.cta{margin:.7rem 0 0;text-align:center;border:1px solid var(--line-strong)}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;
  font-family:var(--sans);font-size:.94rem;font-weight:500;
  padding:.72rem 1.3rem;border-radius:var(--radius);
  border:1px solid transparent;cursor:pointer;background:none;color:inherit;
  transition:background .22s ease,border-color .22s ease,color .22s ease;
}
.btn .arrow{transition:transform .22s ease}
.btn:hover .arrow{transform:translateX(3px)}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-deep)}
.btn-ghost{border-color:var(--line-strong);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent-deep);background:var(--accent-soft)}

/* ---------- draft strip ---------- */
.draft-strip{border-bottom:1px solid var(--line);background:var(--paper-2)}
.draft-strip .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem 1rem;padding-block:.62rem}
.draft-strip .k{font-family:var(--mono);font-size:.68rem;font-weight:500;letter-spacing:.18em;text-transform:uppercase;color:var(--sand)}
.draft-strip .t{color:var(--muted);font-size:.88rem}
.review-toggle{
  margin-left:auto;display:inline-flex;align-items:center;gap:.55rem;
  font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ink-soft);background:transparent;border:1px solid var(--line-strong);
  border-radius:999px;padding:.34rem .75rem;cursor:pointer;transition:border-color .2s ease,background .2s ease;
}
.review-toggle:hover{border-color:var(--accent)}
.review-toggle .sw{width:24px;height:13px;border-radius:999px;background:var(--line-strong);position:relative;transition:background .2s ease}
.review-toggle .sw::after{content:"";position:absolute;left:2px;top:2px;width:9px;height:9px;border-radius:50%;background:#fff;transition:transform .2s ease}
.review-toggle[aria-pressed="true"]{background:var(--accent-soft);border-color:var(--accent-line)}
.review-toggle[aria-pressed="true"] .sw{background:var(--accent)}
.review-toggle[aria-pressed="true"] .sw::after{transform:translateX(11px)}
@media (max-width:640px){.review-toggle{margin-left:0}}

/* review mode: provenance marks */
.review-legend{display:none}
body.review .review-legend{
  display:flex;flex-wrap:wrap;gap:.5rem 1.2rem;padding:.2rem 0 .8rem;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;color:var(--muted);
}
.review-legend span{display:inline-flex;align-items:center;gap:.45rem}
.review-legend i{width:12px;height:3px;border-radius:2px;display:inline-block}
[data-src]{position:relative}
body.review [data-src]::before{
  content:"";position:absolute;left:-.9rem;top:.25em;bottom:.25em;width:3px;border-radius:2px;
}
body.review [data-src="tnu"]::before,.review-legend .tnu{background:var(--accent)}
body.review [data-src="adapted"]::before,.review-legend .adapted{background:#7fa5aa}
body.review [data-src="lit"]::before,.review-legend .lit{background:#6d7fae}
body.review [data-src="pub"]::before,.review-legend .pub{background:#8a7aa6}
body.review [data-src="new"]::before,.review-legend .new{background:var(--sand)}
body.review [data-src="todo"]::before,.review-legend .todo{background:repeating-linear-gradient(180deg,#b5654a 0 4px,transparent 4px 7px)}
.review-legend .todo{background:#b5654a}
.review-only{display:none}
body.review .review-only{display:block}

/* ---------- page header ---------- */
.page-head{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.page-head .wrap{position:relative;z-index:2}
.page-head-grid{
  display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);
  gap:clamp(2rem,5vw,4.5rem);align-items:center;
  padding-block:clamp(3.2rem,7vw,5.6rem) clamp(3rem,6vw,4.8rem);
}
.page-head h1{
  font-size:clamp(2.4rem,1.7rem + 3.2vw,4.3rem);letter-spacing:-.022em;margin-top:1.3rem;
}
.page-head h1 em{font-style:italic;font-weight:300;color:var(--accent-deep)}
.page-head .lede{
  margin-top:1.4rem;font-family:var(--serif);font-weight:300;
  font-size:clamp(1.15rem,1.02rem + .62vw,1.45rem);line-height:1.5;color:var(--ink-soft);max-width:36ch;
}
.page-head .head-meta{margin-top:1.8rem;display:flex;flex-wrap:wrap;gap:.45rem}
.page-head-figure{justify-self:end;width:100%;max-width:440px}
.page-head-figure svg{width:100%;height:auto;display:block;overflow:visible}
@media (max-width:860px){
  .page-head-grid{grid-template-columns:1fr}
  .page-head-figure{justify-self:start;max-width:360px;order:-1}
}

.chip{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.07em;text-transform:uppercase;
  color:var(--ink-soft);background:var(--accent-soft);border:1px solid var(--accent-line);
  border-radius:999px;padding:.22rem .6rem;white-space:nowrap;
}
.chip.sand{background:var(--sand-soft);border-color:var(--sand-line)}
.chip.plain{background:transparent;border-color:var(--line-strong)}

/* ---------- article layout with sticky index ---------- */
.article{display:grid;grid-template-columns:13rem minmax(0,1fr);gap:clamp(2rem,5vw,4.5rem);padding-block:clamp(3rem,6vw,5rem)}
.toc{position:sticky;top:104px;align-self:start;font-size:.86rem}
.toc .k{font-family:var(--mono);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);margin-bottom:.9rem}
.toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.toc li a{
  display:block;padding:.38rem 0 .38rem 1rem;margin-left:-1px;border-left:1px solid transparent;
  color:var(--muted);line-height:1.35;transition:color .2s ease,border-color .2s ease;
}
.toc li a:hover{color:var(--ink)}
.toc li a.active{color:var(--accent-deep);border-left-color:var(--accent)}
.toc .toc-num{font-family:var(--mono);font-size:.7rem;color:var(--accent);margin-right:.45rem}
@media (max-width:960px){
  .article{grid-template-columns:1fr}
  .toc{display:none}
}

.block + .block{margin-top:clamp(3.4rem,6vw,5rem)}
.block > .eyebrow{margin-bottom:1rem}
.block h2{font-size:clamp(1.6rem,1.25rem + 1.4vw,2.3rem);letter-spacing:-.015em;max-width:26ch}
.block h3{font-size:1.3rem;font-weight:500;letter-spacing:-.01em}
.prose{max-width:var(--measure)}
.prose p{color:var(--ink-soft)}
.prose p + p{margin-top:1.05rem}
.block h2 + .prose,.block h2 + p{margin-top:1.3rem}
.prose strong{color:var(--ink);font-weight:600}
.prose a,.inline-link{color:var(--accent-deep);border-bottom:1px solid var(--accent-line);transition:border-color .2s ease}
.prose a:hover,.inline-link:hover{border-bottom-color:var(--accent)}
.prose .big{font-family:var(--serif);font-size:1.22rem;line-height:1.55;color:var(--ink);font-weight:300}

/* pull statement */
.statement{
  font-family:var(--serif);font-weight:300;font-size:clamp(1.3rem,1.05rem + 1vw,1.8rem);
  line-height:1.4;color:var(--ink);max-width:36ch;
  padding-left:1.4rem;border-left:1px solid var(--accent);margin-top:2rem;
}

/* ---------- cards & grids ---------- */
.hair-grid{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-top:2rem}
.hair-grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.hair-grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:820px){.hair-grid.cols-2,.hair-grid.cols-3{grid-template-columns:1fr}}
.cell{background:var(--paper-2);padding:clamp(1.4rem,2.4vw,2rem);display:flex;flex-direction:column;gap:.7rem}
.cell .num{font-family:var(--mono);font-size:.76rem;color:var(--accent);letter-spacing:.08em}
.cell h3{font-size:1.24rem}
.cell p{color:var(--muted);font-size:.96rem;line-height:1.6}

dl.kv{margin:.4rem 0 0;display:grid;gap:.7rem}
dl.kv > div{display:grid;grid-template-columns:6.8rem 1fr;gap:.8rem;align-items:baseline;border-top:1px solid var(--line);padding-top:.65rem}
dl.kv dt{font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
dl.kv dd{margin:0;color:var(--ink-soft);font-size:.94rem;line-height:1.55}

/* ---------- figures ---------- */
figure{margin:0}
.fig{margin-top:2.2rem}
.fig.wide{margin-inline:calc(-1 * min(4rem,3vw))}
.fig .frame{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(.6rem,1.4vw,1rem);overflow:hidden}
.fig .frame.dark{background:#0f1416;border-color:#1c2427}
.fig figcaption{margin-top:.85rem;font-size:.88rem;line-height:1.55;color:var(--muted);max-width:62ch}
.fig figcaption b{color:var(--ink-soft);font-weight:600}
.fig .credit{display:block;margin-top:.4rem;font-family:var(--mono);font-size:.68rem;letter-spacing:.02em;color:var(--muted)}
.fig .credit a{border-bottom:1px solid var(--line-strong)}
.fig .credit a:hover{border-bottom-color:var(--accent)}
.fig-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(1rem,2.5vw,1.8rem)}
@media (max-width:760px){.fig-pair{grid-template-columns:1fr}}

.placeholder{
  border:1px dashed var(--line-strong);border-radius:var(--radius);
  background:repeating-linear-gradient(135deg,transparent 0 11px,rgba(46,88,95,.035) 11px 12px),var(--paper-2);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;text-align:center;
  color:var(--muted);padding:2rem 1.4rem;min-height:14rem;
}
.placeholder .k{font-family:var(--mono);font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:var(--sand)}
.placeholder p{font-size:.92rem;max-width:34ch}

/* ---------- notes / callouts ---------- */
.note{
  margin-top:2rem;padding:1.2rem 1.4rem;border:1px solid var(--line);border-left:2px solid var(--accent);
  background:var(--paper-2);border-radius:0 var(--radius) var(--radius) 0;max-width:var(--measure);
}
.note .k{font-family:var(--mono);font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:.45rem}
.note p{color:var(--ink-soft);font-size:.96rem}
.note.sand{border-left-color:var(--sand)}
.note.sand .k{color:var(--sand)}

/* review-only question list */
.review-questions{margin-top:2.4rem;padding:1.3rem 1.5rem;border:1px dashed #b5654a;border-radius:var(--radius);background:rgba(181,101,74,.05);max-width:var(--measure)}
.review-questions .k{font-family:var(--mono);font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:#b5654a;margin-bottom:.6rem}
.review-questions ol{margin:0;padding-left:1.2rem;color:var(--ink-soft);font-size:.94rem}
.review-questions li + li{margin-top:.4rem}

/* ---------- references ---------- */
.refs{list-style:none;margin:1.6rem 0 0;padding:0;border-top:1px solid var(--line);max-width:52rem}
.refs li{display:grid;grid-template-columns:3.6rem 1fr;gap:1rem;padding:1rem 0;border-bottom:1px solid var(--line);align-items:baseline}
.refs .yr{font-family:var(--mono);font-size:.82rem;color:var(--accent)}
.refs .ttl{font-family:var(--serif);font-size:1.06rem;line-height:1.4;color:var(--ink)}
.refs .ttl a{border-bottom:1px solid transparent;transition:border-color .2s ease}
.refs .ttl a:hover{border-bottom-color:var(--accent-line)}
.refs .src{font-size:.86rem;color:var(--muted);margin-top:.25rem}
.refs .src i{font-family:var(--serif)}
.refs .why{font-size:.88rem;color:var(--ink-soft);margin-top:.35rem}
.refs .tag{display:inline-block;margin-left:.5rem;font-family:var(--mono);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);border:1px solid var(--line-strong);border-radius:999px;padding:.1rem .45rem;vertical-align:.12em}

/* ---------- next-page band ---------- */
.next-band{border-top:1px solid var(--line);background:var(--paper-2)}
.next-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,17rem),1fr));gap:1px;background:var(--line);border-inline:1px solid var(--line)}
.next-grid a{background:var(--paper-2);padding:clamp(1.6rem,3vw,2.3rem);display:flex;flex-direction:column;gap:.55rem;transition:background .25s ease}
.next-grid a:hover{background:var(--card)}
.next-grid .k{font-family:var(--mono);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}
.next-grid .h{font-family:var(--serif);font-size:1.3rem;color:var(--ink)}
.next-grid .d{color:var(--muted);font-size:.93rem}
.next-grid .go{margin-top:auto;padding-top:.6rem;font-family:var(--mono);font-size:.72rem;color:var(--accent-deep);letter-spacing:.06em}

/* ---------- footer ---------- */
footer.site{background:var(--ink);color:#9d998f;border-top:1px solid #2f2d26}
.foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1.2rem;padding-block:2.2rem}
.foot .brand{gap:.6rem}
.foot .brand .wordmark{color:#f2efe7;font-family:var(--serif);font-size:1.1rem;letter-spacing:.005em;text-transform:none;font-weight:400}
.foot-links{display:flex;flex-wrap:wrap;gap:1.3rem}
.foot-links a{font-size:.86rem;color:#b6b2a8;transition:color .2s ease}
.foot-links a:hover{color:#fff}
.foot .fine{font-size:.8rem;color:#7c7970;font-family:var(--mono);letter-spacing:.04em}
.foot .fine a{border-bottom:1px solid rgba(124,121,112,.38)}
.foot .fine a:hover{color:#b6b2a8;border-bottom-color:#b6b2a8}

/* ---------- reveal motion ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .7s cubic-bezier(.2,.6,.2,1),transform .7s cubic-bezier(.2,.6,.2,1)}
.reveal.in{opacity:1;transform:none}
.no-js .reveal{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
}

@media print{
  header.site,.draft-strip,.toc,footer.site,.next-band{display:none}
  body{background:#fff}
}
.draft-strip .review-legend{flex-basis:100%}
sup{font-size:.64em;line-height:0;position:relative;top:-.5em;vertical-align:baseline;letter-spacing:.01em}