/* ============================================================
   Engineering print - dual theme (follows the system)
   Spec: /DESIGN-SPEC.md  (tokens verified WCAG + APCA, 2026-09-01)
   Loaded last: re-points the legacy vars, then component voice.
   ============================================================ */
:root{
  --bg:#f7f9fb; --panel:#e9f1f8; --panel2:#eef4fa; --line:#c8d4de;
  --ink:#1d2b3f; --head:#14365c; --mut:#3f5166; --dim:#4a5b6d;
  --accent:#35648f; --violet:#35648f; --glow:rgba(53,100,143,.08);
  --amber:#9a640b; --amber-big:#b97a10; --warn:#b3261e; --maxw:1200px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#111926; --panel:#1a2534; --panel2:#16202e; --line:#2b394c;
    --ink:#dbe4ee; --head:#e8eef6; --mut:#aebccd; --dim:#a8b8ca;
    --accent:#85aed4; --violet:#85aed4; --glow:rgba(133,174,212,.10);
    --amber:#e2a94e; --amber-big:#e2a94e; --warn:#ff8a80;
  }
}
html{background:var(--bg);}
body{font-family:'Source Serif 4', Georgia, 'Times New Roman', serif;
  background:var(--bg); color:var(--ink); line-height:1.68;}
h1,h2,h3,h4,.brand,nav,.nav,.btn,button,.chip,.pill,.tag
{font-family:'Space Grotesk',Inter,-apple-system,sans-serif;}
h1,h2,h3,h4{color:var(--head);}
a{color:var(--accent);}
a:hover{color:var(--amber);}
header,.site-header,.topbar{background:var(--bg)!important;
  border-bottom:1px solid var(--line); box-shadow:none!important;}
.sub,.lede,.dek{color:var(--mut)!important;}
.eyebrow,.kicker,.meta,.byline,time,.readtime,.date,figcaption,.cap,.crumbs
{font-family:'IBM Plex Mono',ui-monospace,SFMono-Regular,monospace;
 font-size:13px; letter-spacing:.04em; color:var(--dim);}
.toc,.in-this-article,.callout,.note,.panel,.card,.glance,.faq,.box
{background:var(--panel); border:1px solid var(--line); border-radius:10px;
 box-shadow:none;}
article img, .post img, figure img{border:1px solid var(--line); border-radius:10px; background:#fff;}
blockquote{border-left:3px solid var(--amber-big); background:var(--panel); color:var(--ink);}
/* the console voice: code stays dark in BOTH themes, by design */
pre, pre code{background:#101722!important; color:#dbe4ee!important;
  border:1px solid #2b394c; border-radius:10px;}
:not(pre)>code{background:var(--panel); color:var(--head);
  border:1px solid var(--line); border-radius:5px; padding:.08em .35em;
  font-family:'IBM Plex Mono',monospace; font-size:.85em;}
hr{border:none; border-top:1px solid var(--line);}
table{border-color:var(--line);} th,td{border-color:var(--line);}
::selection{background:#f5a623; color:#14365c;}
canvas.bg, canvas#bg, .constellation{opacity:.35;}
button:focus-visible, a:focus-visible{outline:2px solid var(--accent); outline-offset:2px;}
@media (prefers-reduced-motion: reduce){*{animation:none!important; transition:none!important;}}
/* Arabic editions */
html[lang="ar"] body{font-family:'Noto Naskh Arabic','Source Serif 4',serif; line-height:1.9;}
html[lang="ar"] h1, html[lang="ar"] h2, html[lang="ar"] h3
{font-family:'Noto Naskh Arabic','Space Grotesk',sans-serif;}
/* home: glass cards that had hardcoded dark backgrounds */
.hero-card{background:var(--panel)!important; backdrop-filter:none!important;}
.hc-row .k{color:var(--dim);} .hc-row .v{color:var(--ink);}
.hc-chips .chip, .chip{background:var(--panel2); border:1px solid var(--line); color:var(--head);}
.mobile-nav, .mnav, nav.open{background:var(--bg)!important;}