/* ============================================================================
   Slim64FS.org — design system
   Aesthetic: restraint. Near-black, bone, one arterial-red accent. Document-grade.
   Spec: Apple HIG / OpenBSD / SQLite.org. No animation beyond hover fades.
   Shares the 64-4 family palette (see corecut4.com, 64-4.com, goibible.org).
   Note: custom property names below (--gold, --cyan, --cream, --graphite) are
   kept unchanged from the original light theme to limit the size of this
   diff; only their values were repointed to the dark family palette.
   ============================================================================ */

/* ---- Fonts (self-hosted, latin subset) ---------------------------------- */
@font-face { font-family:'Inter'; font-style:normal; font-weight:400; font-display:swap;
  src:url('assets/fonts/inter-400.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-style:normal; font-weight:500; font-display:swap;
  src:url('assets/fonts/inter-500.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-style:normal; font-weight:600; font-display:swap;
  src:url('assets/fonts/inter-600.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-style:normal; font-weight:700; font-display:swap;
  src:url('assets/fonts/inter-700.woff2') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-style:normal; font-weight:400; font-display:swap;
  src:url('assets/fonts/jbmono-400.woff2') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-style:normal; font-weight:500; font-display:swap;
  src:url('assets/fonts/jbmono-500.woff2') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-style:normal; font-weight:700; font-display:swap;
  src:url('assets/fonts/jbmono-700.woff2') format('woff2'); }

/* ---- Tokens ------------------------------------------------------------- */
:root{
  --bg:#0A0A0B;
  --ink:#F2EDE4;
  --muted:#ABA69C;
  --gold:#E5484D;          /* family arterial red — accent, used sparingly */
  --gold-deep:#C63E42;     /* deeper red for text-on-dark link contrast */
  --cyan:#8A8F98;          /* family steel — secondary accent, very sparing */
  --cream:#151516;         /* subtle elevated surface */
  --cream-soft:#131314;    /* lighter surface fill */
  --graphite:#131314;      /* footer / diagram accent boxes */
  --line:rgba(242,237,228,.12);
  --line-strong:rgba(242,237,228,.2);
  --sans:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,'SF Mono',Menlo,Consolas,monospace;
  --maxw:1100px;
  --pad:24px;
}

/* ---- Reset / base ------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box;}
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:var(--sans); font-size:17px; line-height:1.65;
  font-feature-settings:"kern","liga","calt"; text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{ font-family:var(--mono); font-weight:500; line-height:1.2;
  letter-spacing:-0.01em; color:var(--ink); margin:0 0 .6em; }
h2{ font-size:1.6rem; } h3{ font-size:1.2rem; } h4{ font-size:1rem; }
p{ margin:0 0 1.1em; } p:last-child{ margin-bottom:0; }
a{ color:var(--gold-deep); text-decoration:none; transition:color .15s ease, border-color .15s ease; }
a:hover{ color:var(--gold); text-decoration:underline; text-underline-offset:3px;
  text-decoration-thickness:1px; text-decoration-color:var(--gold); }
strong{ font-weight:600; }
hr{ border:0; border-top:1px solid var(--line); margin:0; }
::selection{ background:rgba(229,72,77,.28); }
:focus-visible{ outline:2px solid var(--gold); outline-offset:2px; border-radius:2px; }
@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ transition:none !important; }
}

/* ---- Layout ------------------------------------------------------------- */
.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 var(--pad); }
section{ padding:84px 0; border-top:1px solid var(--line); }
section:first-of-type{ border-top:0; }
.section-num{ font-family:var(--mono); font-size:.8rem; color:var(--gold-deep);
  letter-spacing:.08em; text-transform:uppercase; margin:0 0 .4em; }
.lede{ font-size:1.12rem; color:var(--muted); max-width:64ch; }
.center{ text-align:center; }

/* scroll anchor offset for fixed nav */
section[id], a[id]{ scroll-margin-top:84px; }

/* ---- Top navigation ----------------------------------------------------- */
.nav{ position:sticky; top:0; z-index:50; background:rgba(10,10,11,.92);
  backdrop-filter:saturate(180%) blur(8px); border-bottom:1px solid var(--line); }
.nav-inner{ max-width:var(--maxw); margin:0 auto; padding:0 var(--pad);
  height:60px; display:flex; align-items:center; justify-content:space-between; gap:16px; }
.brand{ font-family:var(--mono); font-weight:700; font-size:1.05rem; color:var(--ink);
  letter-spacing:-.01em; }
.brand:hover{ color:var(--ink); text-decoration:none; }
.nav-links{ display:flex; gap:22px; align-items:center; flex-wrap:wrap; }
.nav-links a{ font-size:.92rem; color:var(--muted); }
.nav-links a:hover{ color:var(--gold-deep); text-decoration:none; }
.nav-links a.cta{ color:var(--ink); border:1px solid var(--line-strong);
  padding:5px 12px; border-radius:6px; }
.nav-links a.cta:hover{ border-color:var(--gold); color:var(--gold-deep); }

/* ---- Hero --------------------------------------------------------------- */
.hero{ text-align:center; padding:92px 0 76px; border-top:0; }
.hero img.logo{ width:340px; max-width:80%; height:auto; margin:0 auto 26px; display:block; }
.hero h1{ font-size:3.1rem; font-weight:700; letter-spacing:-.02em; margin:0 0 .35em; }
.sr-only{ position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden;
  clip:rect(0,0,0,0); white-space:nowrap; border:0; }
.hero .tagline{ font-size:1.22rem; color:var(--muted); max-width:60ch; margin:0 auto 30px; }
.btn-row{ display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }
.btn{ font-family:var(--sans); font-size:.96rem; font-weight:500; line-height:1;
  padding:12px 20px; border-radius:7px; border:1px solid var(--line-strong);
  color:var(--ink); background:var(--cream-soft); cursor:pointer;
  transition:border-color .15s ease, background .15s ease, color .15s ease; }
.btn:hover{ border-color:var(--gold); color:var(--gold-deep); text-decoration:none; }
.btn-primary{ background:var(--gold); border-color:var(--gold); color:var(--bg); }
.btn-primary:hover{ background:var(--gold-deep); border-color:var(--gold-deep); color:var(--bg); }

/* ---- Stat boxes --------------------------------------------------------- */
.stats{ display:grid; grid-template-columns:repeat(3,1fr); gap:14px;
  max-width:760px; margin:48px auto 0; }
.stat{ border:1px solid var(--line); border-radius:8px; padding:18px 16px; text-align:center;
  background:var(--cream-soft); }
.stat .v{ font-family:var(--mono); font-weight:700; font-size:1.18rem; color:var(--ink); }
.stat .k{ font-size:.82rem; color:var(--muted); margin-top:4px; }

/* ---- Generic blocks ----------------------------------------------------- */
.grid-2{ display:grid; grid-template-columns:1fr 1fr; gap:40px; }
.principles{ display:grid; grid-template-columns:1fr 1fr; gap:22px 40px; margin-top:8px; }
.principle h3{ font-size:1.05rem; margin-bottom:.3em; }
.principle h3 .i{ color:var(--gold-deep); }
.principle p{ color:var(--muted); margin:0; font-size:.97rem; }

/* ---- Tables ------------------------------------------------------------- */
table{ width:100%; border-collapse:collapse; font-size:.94rem; margin:6px 0 4px; }
th,td{ text-align:left; padding:10px 14px; border-bottom:1px solid var(--line); }
thead th{ font-family:var(--mono); font-weight:500; font-size:.82rem; color:var(--muted);
  text-transform:uppercase; letter-spacing:.04em; border-bottom:1px solid var(--line-strong); }
tbody tr:hover{ background:var(--cream-soft); }
td.num,th.num{ font-family:var(--mono); }
.ok{ color:#4fae7b; font-weight:600; } .no{ color:#d97a7a; } .warn{ color:var(--gold-deep); }
.caption{ font-size:.84rem; color:var(--muted); margin-top:10px; }
.tscroll{ overflow-x:auto; }
.tscroll table{ min-width:520px; }

/* ---- Standalone code block ---------------------------------------------- */
pre.code{ margin:0; padding:16px 18px; background:var(--cream-soft);
  border:1px solid var(--line); border-radius:8px;
  font-family:var(--mono); font-size:.85rem; line-height:1.55; overflow:auto; }

/* ---- Checklist (validation) -------------------------------------------- */
.checks{ list-style:none; padding:0; margin:0; columns:2; column-gap:48px; }
.checks li{ padding:8px 0 8px 30px; position:relative; break-inside:avoid; border-bottom:1px solid var(--line); }
.checks li::before{ content:"\2713"; position:absolute; left:0; top:8px;
  color:var(--cyan); font-weight:700; font-family:var(--mono); }
.checks li .r{ color:var(--muted); font-size:.88rem; }

/* ---- Architecture diagram (CSS boxes) ---------------------------------- */
.diagram{ display:flex; flex-direction:column; align-items:center; gap:6px; margin:8px 0; }
.dbox{ font-family:var(--mono); font-size:.92rem; background:var(--cream-soft); color:var(--ink);
  border:1px solid var(--line-strong); border-radius:7px; padding:12px 22px; min-width:260px; text-align:center; }
.dbox.accent{ background:var(--gold); color:var(--bg); border-color:var(--gold); }
.darrow{ color:var(--cyan); font-family:var(--mono); font-size:1.1rem; line-height:1; }
.dcomp{ display:flex; flex-wrap:wrap; gap:10px; justify-content:center; margin-top:14px; }
.dchip{ font-family:var(--mono); font-size:.82rem; color:var(--muted);
  border:1px solid var(--line); border-radius:6px; padding:8px 14px; background:var(--cream-soft); }

/* ---- Cards (documentation) --------------------------------------------- */
.cards{ display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.card{ display:block; border:1px solid var(--line); border-radius:9px; padding:18px 18px 16px;
  background:var(--cream-soft); transition:border-color .15s ease, transform .15s ease, box-shadow .15s ease; }
.card:hover{ border-color:var(--gold); transform:translateY(-2px);
  box-shadow:0 6px 22px rgba(0,0,0,.35); text-decoration:none; }
.card .t{ font-family:var(--mono); font-weight:500; color:var(--ink); font-size:1rem; margin-bottom:5px; }
.card .d{ color:var(--muted); font-size:.9rem; }

/* ---- Avatars (Jay & Chris) --------------------------------------------- */
.avatars{ display:grid; grid-template-columns:1fr 1fr; gap:22px; }
.avatar{ border:1px solid var(--line); border-radius:10px; padding:24px; background:var(--cream-soft); }
.avatar h3{ font-size:1.15rem; }
.avatar .role{ color:var(--gold-deep); font-family:var(--mono); font-size:.82rem;
  text-transform:uppercase; letter-spacing:.06em; margin-bottom:10px; }
.avatar ul{ margin:.6em 0 0; padding-left:1.1em; color:var(--muted); font-size:.92rem; }

/* ---- Audit grid --------------------------------------------------------- */
.audit{ display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:6px; }
.amodel{ border:1px solid var(--line); border-radius:8px; padding:16px 12px; text-align:center; }
.amodel .m{ font-family:var(--mono); font-weight:500; font-size:.92rem; }
.amodel .f{ font-family:var(--mono); font-size:1.5rem; color:var(--gold-deep); margin:6px 0 2px; }
.amodel .s{ font-size:.78rem; color:var(--muted); }

/* ---- FAQ ---------------------------------------------------------------- */
.faq{ margin-top:8px; }
.faq details{ border-bottom:1px solid var(--line); padding:14px 0; }
.faq summary{ font-family:var(--mono); font-weight:500; font-size:1rem; cursor:pointer;
  list-style:none; color:var(--ink); }
.faq summary::-webkit-details-marker{ display:none; }
.faq summary::before{ content:"+"; color:var(--gold-deep); margin-right:12px; font-weight:700; }
.faq details[open] summary::before{ content:"\2013"; }
.faq .a{ color:var(--muted); padding:12px 0 2px 26px; font-size:.97rem; }

/* ---- Timeline ----------------------------------------------------------- */
.timeline{ display:flex; gap:0; align-items:flex-start; overflow-x:auto; padding:14px 0 4px; }
.tnode{ flex:1; min-width:96px; text-align:center; position:relative; padding-top:22px; }
.tnode::before{ content:""; position:absolute; top:6px; left:50%; width:100%; height:2px;
  background:var(--line-strong); }
.tnode:last-child::before{ display:none; }
.tnode::after{ content:""; position:absolute; top:1px; left:calc(50% - 5px); width:10px; height:10px;
  border-radius:50%; background:var(--bg); border:2px solid var(--gold); }
.tnode .v{ font-family:var(--mono); font-weight:700; font-size:.95rem; }
.tnode .k{ font-size:.78rem; color:var(--muted); }

/* ---- Footer ------------------------------------------------------------- */
footer{ background:var(--graphite); color:var(--muted); margin-top:0; padding:54px 0 40px;
  border-top:1px solid var(--line); }
footer .wrap{ display:flex; flex-direction:column; align-items:center; gap:16px; text-align:center; }
footer .flinks{ display:flex; gap:24px; flex-wrap:wrap; justify-content:center; }
footer a{ color:var(--ink); font-size:.92rem; } footer a:hover{ color:var(--gold); }
footer .brand-f{ font-family:var(--mono); font-weight:700; color:var(--ink); font-size:1.05rem; }
footer .copy{ color:var(--muted); font-size:.82rem; }
footer .powered-by{ color:var(--muted); font-size:.82rem; margin-top:4px; }
footer .powered-by a{ color:var(--gold-deep); }
footer .powered-by a:hover{ color:var(--gold); }

/* ============================================================================
   Rendered doc/spec pages (pandoc) — same shell, readable measure
   ============================================================================ */
.doc{ max-width:820px; margin:0 auto; padding:48px var(--pad) 80px; }
.doc h1{ font-size:2rem; font-weight:700; margin-bottom:.5em; }
.doc h2{ font-size:1.4rem; margin-top:1.7em; padding-top:.3em; }
.doc h3{ font-size:1.12rem; margin-top:1.4em; }
.doc h2, .doc h3{ border-top:0; }
.doc p,.doc li{ color:var(--ink); }
.doc blockquote{ margin:1.2em 0; padding:.4em 1.1em; border-left:3px solid var(--gold);
  color:var(--muted); background:var(--cream-soft); border-radius:0 6px 6px 0; }
.doc code{ font-family:var(--mono); font-size:.88em; background:var(--cream-soft);
  padding:.12em .4em; border-radius:4px; }
.doc pre{ background:var(--cream-soft); border:1px solid var(--line); border-radius:8px;
  padding:16px 18px; overflow:auto; font-size:.86rem; line-height:1.55; }
.doc pre code{ background:none; padding:0; }
.doc table{ font-size:.9rem; }
.doc .backlink{ font-family:var(--mono); font-size:.85rem; margin-bottom:28px; display:inline-block; }

/* ---- Responsive --------------------------------------------------------- */
@media (max-width:860px){
  .stats{ grid-template-columns:repeat(2,1fr); }
  .grid-2,.principles,.avatars{ grid-template-columns:1fr; gap:24px; }
  .cards{ grid-template-columns:1fr 1fr; }
  .audit{ grid-template-columns:repeat(2,1fr); }
  .checks{ columns:1; }
  .hero h1{ font-size:2.4rem; }
  .nav-links{ gap:14px; } .nav-links a{ font-size:.86rem; }
}
@media (max-width:560px){
  body{ font-size:16px; }
  section{ padding:60px 0; }
  .stats,.cards,.audit{ grid-template-columns:1fr; }
  .nav-inner{ height:auto; padding-top:10px; padding-bottom:10px; flex-direction:column; align-items:flex-start; }
}

/* ---------- Cookie consent bar ---------- */
.cookiebar{ position:fixed; left:0; right:0; bottom:0; z-index:100;
  background:var(--graphite); color:var(--ink); box-shadow:0 -2px 14px rgba(0,0,0,.5); }
.cookiebar-inner{ max-width:1100px; margin:0 auto; padding:14px var(--pad);
  display:flex; align-items:center; justify-content:space-between; gap:18px; flex-wrap:wrap; }
.cookiebar p{ margin:0; font-size:.88rem; color:var(--muted); max-width:760px; }
.cookiebar a{ color:var(--gold); }
.cookiebar-btns{ display:flex; gap:10px; }
.cookiebar button{ font-family:var(--mono); font-size:.85rem; padding:8px 18px;
  border-radius:6px; cursor:pointer; border:1px solid var(--line-strong); background:transparent; color:var(--ink); }
.cookiebar button.cb-accept{ background:var(--gold); border-color:var(--gold); color:var(--bg); font-weight:600; }
.cookiebar button:hover{ filter:brightness(1.12); }

/* ---- Print ---------------------------------------------------------------
   The site is an engineering document; it should print like one — always
   light paper regardless of the on-screen theme. */
@media print{
  .nav,.cookiebar,.btn-row{ display:none; }
  body{ font-size:11pt; color:#000; background:#fff; }
  section{ padding:28px 0; break-inside:auto; }
  .stat,.card,.avatar,.amodel,.principle,table{ break-inside:avoid; }
  a{ color:#000; text-decoration:underline; }
  footer{ background:none; color:#000; border-top:1px solid #000; }
  footer a,footer .brand-f,footer .copy{ color:#000; }
}