/* ORGANIC MANIM INTERIOR — dark, luminous, 3Blue1Brown-adjacent.
   Deliberately a single dark world (an explainer canvas). Mirrors the banknote
   class names so article pages swap only the stylesheet. */
:root{
  --paper:#0A0E0C; --panel:#111713; --ink:#EAEFE7; --dim:#8FA091;
  --line:#233029; --halo:#0A0E0C;
  --bill:#4BE39C;      /* luminous green — primary */
  --bronze:#E7B15A;    /* warm gold — secondary */
  --blue:#5EC8E6;      /* manim blue */
  --pink:#EC6FA0;      /* manim pink */
  --display:"Bodoni 72","Bodoni MT",Didot,"Playfair Display",serif;
  --body:"Inter",ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  --mono:"SF Mono",ui-monospace,Menlo,Consolas,monospace;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--paper);color:var(--ink);font-family:var(--body);
  font-size:17px;line-height:1.68;-webkit-font-smoothing:antialiased;
  background-image:radial-gradient(1200px 700px at 78% -8%, rgba(75,227,156,.07), transparent 60%),
                   radial-gradient(900px 600px at 8% 12%, rgba(94,200,230,.05), transparent 55%);
  background-attachment:fixed}
.col{max-width:64ch;margin:0 auto;padding:0 22px}
.wide{max-width:1040px;margin:0 auto;padding:0 22px}
a{color:var(--bill);text-decoration-color:rgba(75,227,156,.35);text-underline-offset:3px}
p{margin:0 0 1.2em}
h1,h2,h3{font-family:var(--display);font-weight:500;text-wrap:balance;line-height:1.1;margin:0}
.eyebrow,.part{font-family:var(--mono);font-size:11px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--bronze)}
em{font-style:italic;color:#F3F6EF}
strong{font-weight:600;color:#F6F9F1}

/* nav */
.nav{position:sticky;top:0;z-index:30;background:rgba(10,14,12,.72);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1040px;margin:0 auto;padding:11px 22px;display:flex;
  align-items:center;justify-content:space-between;gap:14px}
.nav a.brand{font-family:var(--display);font-size:18px;color:var(--ink);text-decoration:none}
.nav .links{display:flex;gap:16px;font-family:var(--mono);font-size:10.5px;
  letter-spacing:.12em;text-transform:uppercase;flex-wrap:wrap}
.nav .links a{color:var(--dim);text-decoration:none}
.nav .links a.on{color:var(--bill)}
.nav .links a:hover{color:var(--blue)}

/* hero */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero-inner{position:relative;padding:104px 22px 88px;max-width:900px;margin:0 auto}
.hero .part{display:block;margin-bottom:24px}
.hero h1{font-size:clamp(46px,8.5vw,104px);letter-spacing:-.015em;color:#F4F8EF}
.hero .sub{font-size:clamp(18px,2.4vw,24px);font-family:var(--display);
  font-style:italic;color:var(--dim);max-width:34ch;margin-top:22px;line-height:1.4}
.hero .plain{font-size:15.5px;color:var(--dim);max-width:52ch;margin-top:20px;line-height:1.6}
.serial{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--dim);
  margin-top:42px;display:flex;gap:2.4em;flex-wrap:wrap}
.serial b{color:var(--bronze);font-weight:400}
@media(max-width:560px){.hero-inner{padding-top:72px}.serial{gap:.4em 1.6em;font-size:10px}}

/* sections + scroll reveal */
section{padding:60px 0 8px}
.reveal{opacity:0;transform:translateY(18px);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}}
.sec-head{display:flex;align-items:flex-start;gap:18px;border-top:1px solid var(--line);
  padding-top:20px;margin-bottom:26px}
.sec-head .no{font-family:var(--display);font-size:46px;color:var(--bronze);line-height:.9;margin-top:-3px}
.sec-head h2{font-size:clamp(26px,4vw,40px);color:#F2F6EC}
.lede{font-size:19px}
.pullquote{font-family:var(--display);font-style:italic;font-size:clamp(21px,3vw,28px);
  color:#F2F6EC;border-left:2px solid var(--bill);padding:2px 0 2px 22px;margin:32px 0;
  max-width:30ch;line-height:1.32}

/* manim figure frame */
.manim{position:relative;background:radial-gradient(120% 120% at 50% 0%, #0d1411, #080b09);
  border:1px solid var(--line);border-radius:14px;padding:14px;margin:34px 0;overflow:hidden}
.manim canvas{display:block;width:100%;height:auto}
.fig-cap{font-family:var(--mono);font-size:11.5px;color:var(--dim);text-align:center;
  margin:14px 4px 4px;letter-spacing:.05em}
.replay{position:absolute;top:12px;right:12px;font-family:var(--mono);font-size:10px;
  letter-spacing:.12em;color:var(--dim);background:rgba(255,255,255,.04);border:1px solid var(--line);
  border-radius:20px;padding:5px 12px;cursor:pointer}
.replay:hover{color:var(--bill);border-color:var(--bill)}

.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:28px 26px;margin:32px 0}
.merge-wrap{display:flex;justify-content:center}
.merge-wrap svg{max-width:520px;width:100%;height:auto}

/* credit */
.credit{border:1px solid var(--line);background:var(--panel);border-radius:12px;
  padding:18px 22px;margin:30px 0;display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap}
.credit .k{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--bronze);min-width:110px;margin-top:3px}
.credit .v{font-size:15px;color:var(--dim);max-width:60ch}
.credit .v a{color:var(--blue)}

/* argument blocks */
.ware{border-top:1px solid var(--line);padding:28px 0 24px;display:grid;
  grid-template-columns:64px 1fr;gap:10px 26px}
.ware .wno{font-family:var(--display);font-size:40px;color:var(--bronze);line-height:1;font-variant-numeric:tabular-nums}
.ware h3{font-size:29px;color:#F2F6EC}
.ware h3 .def{font-family:var(--body);font-style:normal;font-weight:400;
  font-size:17px;color:var(--dim);display:block;margin-top:8px;line-height:1.5}
.ware .rows{grid-column:2;display:grid;gap:10px;margin-top:14px}
.wrow{display:grid;grid-template-columns:128px 1fr;gap:14px;align-items:baseline}
.wrow .k{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--bronze)}
.wrow .v{font-size:15.5px;line-height:1.6}
/* concrete + counter chips woven from the agent workflow */
.hardened{grid-column:2;display:grid;gap:10px;margin-top:14px}
.chip{border-radius:10px;padding:12px 15px;font-size:14.5px;line-height:1.55;border:1px solid var(--line)}
.chip .lab{font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;text-transform:uppercase;display:block;margin-bottom:5px}
.chip.concrete{background:rgba(75,227,156,.06)}
.chip.concrete .lab{color:var(--bill)}
.chip.counter{background:rgba(236,111,160,.06)}
.chip.counter .lab{color:var(--pink)}
.chip.counter .resp{display:block;margin-top:6px;color:var(--dim);font-style:italic}
@media(max-width:560px){.ware{grid-template-columns:1fr}.ware .rows,.hardened{grid-column:1}.wrow{grid-template-columns:1fr;gap:2px}}

/* mechanisms */
.mechs{display:grid;gap:0;margin:28px 0;border-top:1px solid var(--line)}
.mech{display:grid;grid-template-columns:210px 1fr;gap:20px;padding:18px 0;border-bottom:1px solid var(--line)}
.mech .k{font-family:var(--display);font-size:21px;color:var(--bill)}
.mech .v{font-size:15.5px;line-height:1.6}
@media(max-width:560px){.mech{grid-template-columns:1fr;gap:4px}}

/* collapse interactive */
.collapse{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:26px 26px 30px;margin:32px 0}
.collapse .ctitle{font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--bronze);margin-bottom:6px}
.collapse .csub{font-size:14.5px;color:var(--dim);margin-bottom:18px}
#collapseSvg{width:100%;height:auto;display:block;max-width:600px;margin:0 auto}
.scrub-row{display:flex;align-items:center;gap:12px;margin:20px 0 4px;flex-wrap:wrap}
.scrub-row label{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim);min-width:150px}
.scrub-row .end{font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;color:var(--dim)}
input[type=range]{-webkit-appearance:none;appearance:none;height:2px;background:var(--line);flex:1;min-width:150px;border-radius:2px;outline-offset:6px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--bill);cursor:pointer;border:2px solid var(--paper);box-shadow:0 0 12px rgba(75,227,156,.6)}
input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--bill);cursor:pointer;border:2px solid var(--paper)}
input[type=range]:focus-visible::-webkit-slider-thumb{outline:2px solid var(--bronze);outline-offset:2px}
.readout{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:20px;margin:24px 0 16px}
.stat .k{font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim);display:block;margin-bottom:6px}
.stat .v{font-family:var(--display);font-size:clamp(20px,3vw,27px);color:var(--bill);line-height:1.12}
.verdict{border-top:1px dashed var(--line);padding-top:16px;font-size:15.5px;font-style:italic;color:var(--ink);min-height:64px}
.verdict b{color:var(--bronze);font-style:normal}

/* scenarios */
.scen-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;margin:30px 0}
.scen{border:1px solid var(--line);background:var(--panel);border-radius:14px;padding:20px 22px;position:relative;transition:border-color .2s,box-shadow .2s,transform .2s}
.scen.on{border-color:var(--bronze);box-shadow:0 0 0 1px var(--bronze),0 0 30px rgba(231,177,90,.15);transform:translateY(-2px)}
.scen .tag{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--bronze)}
.scen h3{font-size:24px;margin:6px 0 8px;color:#F2F6EC}
.scen p{font-size:14.5px;color:var(--dim);margin:0 0 8px;line-height:1.55}
.scen .row{font-family:var(--mono);font-size:11px;letter-spacing:.02em;margin-top:8px}
.scen .row b{color:var(--blue);font-weight:400}
.scen.good{border-left:3px solid var(--bill)}
.scen.good h3{color:var(--bill)}

/* chooser */
.chooser{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:26px 26px 30px;margin:34px 0}
.chooser .ctitle{font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--bronze);margin-bottom:16px}
.chooser-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:720px){.chooser-grid{grid-template-columns:minmax(0,360px) 1fr;align-items:center}}
#quad{width:100%;height:auto;display:block;max-width:360px;margin:0 auto;touch-action:none;cursor:crosshair}
.quad-out .lead{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--bronze)}
.quad-out h4{font-family:var(--display);font-size:29px;margin:4px 0 8px;color:#F2F6EC}
.quad-out p{font-size:15px;color:var(--dim);margin:6px 0 0;line-height:1.6}
.quad-hint{font-family:var(--mono);font-size:10.5px;color:var(--dim);letter-spacing:.06em;margin:12px 2px 0;text-align:center}

/* pager */
.pager{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);margin-top:60px;padding:26px 0 8px;flex-wrap:wrap}
.pager a{text-decoration:none;color:inherit;font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;max-width:46%}
.pager a .dir{color:var(--bronze);display:block;margin-bottom:4px}
.pager a .ttl{font-family:var(--display);font-size:19px;color:var(--ink);text-transform:none;letter-spacing:0}
.pager a:hover .ttl{color:var(--bill)}
.pager a.next{text-align:right;margin-left:auto}

.coda{border-top:1px solid var(--line);margin-top:60px;padding:64px 0 24px;text-align:center}
.coda p{font-family:var(--display);font-size:clamp(22px,3.4vw,32px);font-style:italic;max-width:26em;margin:0 auto 1em;line-height:1.35;text-wrap:balance;color:#F2F6EC}
footer{padding:30px 0 56px;text-align:center;font-family:var(--mono);font-size:11px;color:var(--dim);letter-spacing:.08em;line-height:1.9}
footer a{color:var(--dim)}