/* =====================================================================
   Behind the Glass — the making-of page.
   Wears the dashboard's field-journal skin (see ../dashboard.css): warm
   near-black, aged-paper ink, gilt accents, serif small-caps, film grain.
   No framework, no build step — plain CSS, one stylesheet.
   ===================================================================== */
:root{
  --bg:#15130d; --panel:#1c1910; --panel2:#221e14; --ink:#e9dec6; --dim:#a89b7e;
  --faint:#6d6249; --rule:#37301f; --rule2:#4a4029;
  --gilt:#c9a24b; --sage:#94a36b; --rust:#c05f3e; --ok:#86ab5d;
  /* the cast — one hue each, used across the re-ID demos */
  --stan:#c9a24b; --notch:#6f9bd1; --elliot:#c07f9e; --unknown:#7d7458;
  --serif:'Iowan Old Style','Palatino Linotype','Book Antiqua',Palatino,'Hoefler Text',Constantia,Georgia,'Times New Roman',serif;
  --mono:'Cascadia Code','Cascadia Mono',Consolas,'SFMono-Regular',ui-monospace,monospace;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
html,body{margin:0; overflow-x:hidden;}
body{
  background:radial-gradient(120% 70% at 50% -8%, #211c11 0%, var(--bg) 52%), var(--bg);
  color:var(--ink); font-family:var(--serif); font-size:17px; line-height:1.65;
  -webkit-font-smoothing:antialiased; min-height:100vh;
}
body::before{ /* film grain */
  content:""; position:fixed; inset:0; pointer-events:none; z-index:900; opacity:.045;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
a{color:inherit;}
.lbl{font-family:var(--mono); font-size:10.5px; letter-spacing:.22em; text-transform:uppercase; color:var(--faint);}
.mono{font-family:var(--mono);}
.gilt{color:var(--gilt);}

/* ---- masthead ---- */
header.mast{ max-width:980px; margin:0 auto; padding:34px 26px 0; text-align:center; }
.mast .top{display:flex; justify-content:space-between; align-items:flex-end; padding:6px 2px; color:var(--dim); border-bottom:1px solid var(--rule2); }
.mast h1{ font-family:var(--serif); font-weight:500; font-size:clamp(34px,6vw,62px); letter-spacing:.01em;
  margin:22px 0 6px; font-variant:small-caps; }
.mast h1 .amp{color:var(--gilt); font-style:italic;}
.mast .sub{font-style:italic; color:var(--dim); font-size:clamp(15px,2vw,19px); margin-bottom:8px;}
.live-chip{display:inline-flex; align-items:center; gap:7px; color:var(--dim); font-family:var(--mono); font-size:11px; letter-spacing:.14em; text-transform:uppercase;}
.live-dot{width:8px;height:8px;border-radius:50%;background:var(--rust); box-shadow:0 0 0 0 rgba(192,95,62,.6); animation:pulse 2.4s infinite;}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(192,95,62,.55)}70%{box-shadow:0 0 0 7px rgba(192,95,62,0)}100%{box-shadow:0 0 0 0 rgba(192,95,62,0)}}
.dek{max-width:680px; margin:18px auto 0; color:var(--dim); font-size:17px;}
.dek b{color:var(--ink); font-weight:500;}

/* ---- sticky chapter nav ---- */
nav.tabs{ position:sticky; top:0; z-index:80; background:rgba(21,19,13,.86); backdrop-filter:blur(6px);
  border-bottom:1px solid var(--rule); margin-top:30px; }
nav.tabs .inner{ max-width:980px; margin:0 auto; padding:0 26px; display:flex; gap:22px; justify-content:center; flex-wrap:wrap; }
nav.tabs a{ color:var(--dim); font-family:var(--mono); font-size:11px; letter-spacing:.12em; text-transform:uppercase;
  padding:13px 1px; text-decoration:none; position:relative; transition:color .2s; white-space:nowrap; }
nav.tabs a:hover{color:var(--ink);}
nav.tabs a.on{color:var(--ink);}
nav.tabs a.on::after{content:""; position:absolute; left:0; right:0; bottom:8px; height:2px; background:var(--gilt);}

/* ---- chapters ---- */
main{max-width:820px; margin:0 auto; padding:10px 26px 90px;}
.chapter{ padding:54px 0 18px; scroll-margin-top:58px; }
.chapter + .chapter{ border-top:1px solid var(--rule); }
.ch-head{ margin:0 0 22px; }
.ch-num{ font-family:var(--mono); font-size:12px; letter-spacing:.18em; color:var(--gilt); }
.ch-title{ font-family:var(--serif); font-variant:small-caps; font-weight:500; letter-spacing:.02em;
  font-size:clamp(26px,4.4vw,40px); line-height:1.08; margin:6px 0 10px; }
.ch-keywords{ display:flex; flex-wrap:wrap; gap:8px; }
.ch-keywords span{ font-family:var(--mono); font-size:10px; letter-spacing:.12em; text-transform:uppercase;
  color:var(--dim); border:1px solid var(--rule2); border-radius:999px; padding:3px 11px; }
.prose p{ margin:0 0 16px; }
.prose p .em{ color:var(--ink); font-style:italic; }
.prose .pull{ font-style:italic; color:var(--ink); border-left:2px solid var(--gilt); padding:2px 0 2px 16px; margin:20px 0; font-size:18px; }
.prose code{ font-family:var(--mono); font-size:13.5px; color:var(--sage); background:rgba(148,163,107,.08); padding:1px 5px; border-radius:3px; }
.prose .fn{ font-family:var(--mono); color:var(--gilt); }

/* ---- demo plate (shared chrome for every embedded demo) ---- */
.demo{ background:linear-gradient(180deg,var(--panel2),var(--panel)); border:1px solid var(--rule2); border-radius:5px;
  margin:24px 0 8px; overflow:hidden; box-shadow:0 16px 40px -28px #000; }
.demo .demo-head{ display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:11px 16px; border-bottom:1px solid var(--rule); color:var(--gilt); }
.demo .demo-head .k{ font-family:var(--mono); font-size:10px; letter-spacing:.2em; text-transform:uppercase; }
.demo .demo-head .corner{ font-family:var(--mono); font-size:10px; letter-spacing:.12em; color:var(--faint); }
.demo .demo-body{ padding:18px; }
.demo .demo-cap{ padding:0 16px 14px; color:var(--faint); font-style:italic; font-size:13.5px; }
.demo .demo-cap b{ color:var(--dim); font-style:normal; }

/* shared little controls */
.btn{ font-family:var(--mono); font-size:11px; letter-spacing:.1em; text-transform:uppercase; cursor:pointer;
  background:none; border:1px solid var(--rule2); color:var(--dim); border-radius:3px; padding:8px 13px; transition:border-color .15s,color .15s,background .15s; }
.btn:hover{ border-color:var(--gilt); color:var(--ink); }
.btn.on{ background:var(--gilt); color:#16120a; border-color:var(--gilt); }
.seg{ display:inline-flex; border:1px solid var(--rule2); border-radius:3px; overflow:hidden; }
.seg button{ background:none; border:0; border-left:1px solid var(--rule2); color:var(--dim);
  font-family:var(--mono); font-size:10px; letter-spacing:.14em; text-transform:uppercase; padding:8px 13px; cursor:pointer; }
.seg button:first-child{ border-left:0; }
.seg button.on{ background:var(--gilt); color:#16120a; }
input[type=range]{ -webkit-appearance:none; appearance:none; height:3px; background:var(--rule2); border-radius:3px; outline:none; }
input[type=range]::-webkit-slider-thumb{ -webkit-appearance:none; width:16px; height:16px; border-radius:50%; background:var(--gilt); border:2px solid #100d07; cursor:pointer; box-shadow:0 1px 3px #000; }
input[type=range]::-moz-range-thumb{ width:14px; height:14px; border-radius:50%; background:var(--gilt); border:2px solid #100d07; cursor:pointer; }
.val{ font-family:var(--mono); font-size:12px; color:var(--gilt); }
.muted{ color:var(--faint); font-style:italic; }
.swatch{ display:inline-block; width:9px; height:9px; border-radius:50%; vertical-align:baseline; margin-right:5px; }

/* reveal-on-scroll */
.chapter, .demo{ }
.reveal{ opacity:0; transform:translateY(10px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:none; }

/* ---- footer ---- */
footer.foot{ max-width:820px; margin:0 auto; padding:30px 26px 70px; border-top:1px solid var(--rule);
  color:var(--faint); font-style:italic; text-align:center; font-size:14px; }
footer.foot a{ color:var(--dim); text-decoration:none; border-bottom:1px dotted var(--rule2); }
footer.foot a:hover{ color:var(--gilt); border-color:var(--gilt); }
.statline{ display:flex; flex-wrap:wrap; gap:10px 26px; justify-content:center; margin:0 0 18px; font-style:normal; }
.statline .stat{ font-family:var(--mono); }
.statline .stat b{ color:var(--ink); font-size:20px; font-weight:400; }
.statline .stat span{ color:var(--faint); font-size:10px; letter-spacing:.14em; text-transform:uppercase; display:block; }

@media (max-width:640px){
  main{ padding:6px 18px 70px; } header.mast{ padding:24px 18px 0; }
  nav.tabs .inner{ gap:14px; justify-content:flex-start; overflow-x:auto; }
  .chapter{ padding:40px 0 14px; }
  body{ font-size:16px; }
}