/* book.css — shared chrome for the Codex web edition.
   The Lab's phosphor theme, tuned for a long technical read: the brand skin
   (dark, JetBrains Mono, magenta/cyan, faint CRT scanlines) kept, the
   reading-hostile motion dropped. Mirrors whitepaper.html's reading column so
   the book, the white paper, and the site read as one system. Linked (not
   inlined) because every chapter page shares it verbatim; a plain <link>
   stylesheet loads fine over file:// as well as over https. */
:root {
  --lab-void: #050507;
  --lab-bg: #0a0a10;
  --lab-bg-2: #11111a;
  --lab-bg-3: #181822;
  --lab-rule: #1d1d28;
  --lab-rule-2: #2a2a38;
  --lab-ink: #eceaf4;
  --lab-ink-2: #c3bed6;
  --lab-dim: #6a6783;
  --lab-faint: #3d3a52;
  --lab-magenta: #ff2bd6;
  --lab-magenta-soft: #ff2bd618;
  --lab-cyan: #2bfff0;
  --lab-amber: #f5b462;
  --lab-scan: rgba(255,255,255,0.016);
  --measure: 760px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; padding: 0; background: var(--lab-void); color: var(--lab-ink); }
body {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 15px; line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  background:
    radial-gradient(ellipse at 50% -10%, #150512 0%, transparent 55%),
    radial-gradient(ellipse at 50% 120%, #0c0413 0%, transparent 60%),
    var(--lab-void);
}
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background: repeating-linear-gradient(to bottom, var(--lab-scan) 0 1px, transparent 1px 3px);
}

/* ---------- top bar ---------- */
.bar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(5,5,7,0.82);
  border-bottom: 1px solid var(--lab-rule);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.bar .inner {
  max-width: 1080px; margin: 0 auto; padding: 13px 26px;
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase;
}
.wordmark { display: inline-flex; gap: 10px; align-items: center; color: var(--lab-ink); font-weight: 700; text-decoration: none; }
.wordmark .seal {
  width: 13px; height: 13px; display: inline-block; transform: rotate(45deg);
  border: 2px solid var(--lab-magenta); position: relative;
  box-shadow: 0 0 10px rgba(255,43,214,0.4); animation: sealspin 9s linear infinite;
}
@keyframes sealspin { from { transform: rotate(45deg); } to { transform: rotate(405deg); } }
.wordmark .seal::after { content: ""; position: absolute; inset: 3px; background: var(--lab-cyan); }
.wordmark .sep { color: var(--lab-magenta); }
.nav { display: inline-flex; gap: 18px; align-items: center; flex-wrap: wrap; }
.nav a { color: var(--lab-dim); text-decoration: none; letter-spacing: 0.16em; transition: color 160ms, text-shadow 160ms; }
.nav a:hover { color: var(--lab-cyan); text-shadow: 0 0 12px rgba(43,255,240,0.5); }
.nav a.here { color: var(--lab-ink); text-shadow: 0 0 10px rgba(255,43,214,0.35); }

/* ---------- layout ---------- */
.page { position: relative; z-index: 1; max-width: 1080px; margin: 0 auto; padding: 0 26px 12vh; }
main { max-width: var(--measure); margin: 0 auto; }

/* ---------- masthead ---------- */
.mast { padding: 8vh 0 2vh; border-bottom: 1px solid var(--lab-rule); }
.kicker { display: block; font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--lab-cyan); margin-bottom: 18px; text-shadow: 0 0 12px rgba(43,255,240,0.45); }
h1 {
  font-weight: 500; font-size: clamp(28px, 4.6vw, 44px); line-height: 1.16;
  letter-spacing: -0.015em; margin: 0 0 20px; color: var(--lab-ink);
  text-shadow: 0 0 26px rgba(255,43,214,0.22), 0 0 70px rgba(255,43,214,0.10);
}
h1 .accent { color: var(--lab-magenta); text-shadow: 0 0 18px rgba(255,43,214,0.6); }
.subtitle { color: var(--lab-ink-2); font-size: 16px; margin: 0 0 22px; max-width: 640px; }
.meta { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 12px; color: var(--lab-dim); letter-spacing: 0.06em; }
.meta b { color: var(--lab-ink-2); font-weight: 500; }
.meta a { color: var(--lab-cyan); text-decoration: none; }
.meta a:hover { text-shadow: 0 0 12px rgba(43,255,240,0.5); }

/* ---------- landing: cover + intro ---------- */
.hero-book {
  display: grid; grid-template-columns: 1fr; gap: 34px; align-items: start;
  padding: 7vh 0 2vh; border-bottom: 1px solid var(--lab-rule);
}
/* the landing page is not a reading page — let it run wider than the text measure
   so the cover can be large without squeezing the hero copy */
main.landing { max-width: 900px; }
@media (min-width: 720px) { .hero-book { grid-template-columns: 320px 1fr; gap: 48px; } }
@media (min-width: 1000px) { .hero-book { grid-template-columns: 380px 1fr; gap: 56px; } }
.cover {
  margin: 0; position: relative; align-self: start;
  box-shadow:
    0 0 0 1px rgba(255,43,214,0.16),
    0 0 46px rgba(255,43,214,0.12),
    0 30px 64px rgba(0,0,0,0.6);
}
.cover img { width: 100%; height: auto; display: block; }
.cover figcaption { margin-top: 12px; font-size: 11px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--lab-dim); text-align: center; }
.hero-book .lede { color: var(--lab-ink-2); font-size: 15.5px; margin: 0 0 16px; }

/* PDF download */
.dl { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin: 0 0 22px; }
.dlbtn {
  display: inline-block; padding: 11px 20px; text-decoration: none;
  font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--lab-magenta); border: 1px solid var(--lab-magenta);
  background: rgba(255,43,214,0.06);
  box-shadow: 0 0 18px rgba(255,43,214,0.14);
  transition: background 150ms, box-shadow 150ms, color 150ms;
}
.dlbtn:hover {
  background: rgba(255,43,214,0.14); color: var(--lab-ink);
  box-shadow: 0 0 26px rgba(255,43,214,0.3);
}
.dlmeta { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--lab-dim); }
.hero-book .lede:first-of-type { margin-top: 4px; }
.hero-book strong { color: var(--lab-ink); font-weight: 700; }
.hero-book em { color: var(--lab-cyan); font-style: normal; }

/* status note about what's published */
.pubnote {
  margin: 5vh 0 2vh; padding: 18px 22px;
  background-color: rgba(17,17,26,0.7);
  border-left: 2px solid var(--lab-magenta);
  background-image: linear-gradient(90deg, var(--lab-magenta-soft) 0%, transparent 55%);
  box-shadow: 0 0 0 1px rgba(255,43,214,0.08), inset 0 1px 0 rgba(43,255,240,0.06);
  font-size: 14px; color: var(--lab-ink-2);
}
.pubnote b { color: var(--lab-ink); }

/* ---------- table of contents (landing) ---------- */
.toc { margin: 5vh 0 0; }
.toc .part { margin-bottom: 5vh; }
.toc .part-hd {
  display: block; font-size: 11px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--lab-magenta); margin-bottom: 16px; padding-bottom: 8px;
  border-bottom: 1px solid var(--lab-rule);
}
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { display: flex; align-items: baseline; gap: 12px; margin-bottom: 4px; }
.toc .row {
  display: flex; align-items: baseline; gap: 14px; width: 100%;
  padding: 9px 12px; text-decoration: none; border: 1px solid transparent;
  transition: background 140ms, border-color 140ms;
}
a.row:hover { background: rgba(43,255,240,0.05); border-color: var(--lab-rule-2); }
.toc .num { color: var(--lab-dim); font-size: 12.5px; min-width: 2.2em; flex-shrink: 0; }
.toc .ttl { color: var(--lab-ink-2); font-size: 14px; flex: 1; }
a.row .ttl { color: var(--lab-ink); }
a.row:hover .ttl { color: var(--lab-cyan); }
.toc .tag {
  font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase;
  padding: 2px 8px; border: 1px solid; flex-shrink: 0; align-self: center;
}
.toc .tag.live { color: var(--lab-cyan); border-color: rgba(43,255,240,0.4); box-shadow: 0 0 12px rgba(43,255,240,0.14); }
.toc .tag.soon { color: var(--lab-faint); border-color: var(--lab-rule-2); }
/* grayed, non-interactive coming-soon rows */
.toc .row.soon { cursor: default; }
.toc .row.soon .num, .toc .row.soon .ttl { color: var(--lab-faint); }

/* ---------- chapter page header ---------- */
.chap-hd { padding: 7vh 0 2vh; border-bottom: 1px solid var(--lab-rule); }
.chap-hd .crumb { display: block; font-size: 11px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--lab-dim); margin-bottom: 16px; }
.chap-hd .crumb a { color: var(--lab-cyan); text-decoration: none; }
.chap-hd .crumb a:hover { text-shadow: 0 0 12px rgba(43,255,240,0.45); }
.chap-hd .part-tag { display: block; font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--lab-cyan); margin-bottom: 14px; text-shadow: 0 0 12px rgba(43,255,240,0.4); }
.chap-hd h1 { margin-bottom: 8px; }
.chap-hd .sec-of { font-size: 12.5px; color: var(--lab-dim); letter-spacing: 0.06em; }

/* section pager inside a multi-part chapter */
.secnav { margin: 3vh 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.secnav a, .secnav span {
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 5px 10px; border: 1px solid var(--lab-rule-2); text-decoration: none;
  color: var(--lab-dim); transition: color 140ms, border-color 140ms;
}
.secnav a:hover { color: var(--lab-cyan); border-color: rgba(43,255,240,0.4); }
.secnav .cur { color: var(--lab-void); background: var(--lab-magenta); border-color: var(--lab-magenta); font-weight: 700; }

/* ---------- prose (pandoc output) ---------- */
.prose { padding-top: 2vh; }
.prose h2 {
  margin: 7vh 0 20px; padding-left: 16px; border-left: 3px solid var(--lab-magenta);
  font-weight: 500; font-size: 21px; line-height: 1.3; color: var(--lab-ink);
  letter-spacing: 0.01em; text-shadow: 0 0 16px rgba(255,43,214,0.28);
  scroll-margin-top: 76px;
}
.prose h3 {
  margin: 4.5vh 0 12px; font-weight: 500; font-size: 15.5px; color: var(--lab-cyan);
  letter-spacing: 0.02em; scroll-margin-top: 76px;
}
.prose h4 { margin: 3vh 0 10px; font-weight: 700; font-size: 14px; color: var(--lab-ink); letter-spacing: 0.02em; }
.prose p { color: var(--lab-ink-2); margin: 0 0 17px; }
.prose strong { color: var(--lab-ink); font-weight: 700; }
.prose em { color: var(--lab-cyan); font-style: normal; }
.prose a { color: var(--lab-cyan); text-decoration: none; border-bottom: 1px solid rgba(43,255,240,0.25); }
.prose a:hover { text-shadow: 0 0 12px rgba(43,255,240,0.45); border-bottom-color: var(--lab-cyan); }

.prose ul { list-style: none; padding: 0; margin: 0 0 17px; }
.prose ul li { position: relative; padding-left: 24px; margin-bottom: 11px; color: var(--lab-ink-2); }
.prose ul li::before { content: "\2192"; position: absolute; left: 0; color: var(--lab-magenta); }
.prose ol { counter-reset: n; list-style: none; padding: 0; margin: 0 0 17px; }
.prose ol > li { counter-increment: n; position: relative; padding-left: 40px; margin-bottom: 15px; color: var(--lab-ink-2); }
.prose ol > li::before {
  content: counter(n); position: absolute; left: 0; top: 1px;
  width: 24px; height: 24px; border: 1px solid var(--lab-magenta); color: var(--lab-magenta);
  font-size: 12px; text-align: center; line-height: 24px;
  box-shadow: 0 0 12px rgba(255,43,214,0.22);
}
.prose li strong, .prose li b { color: var(--lab-ink); font-weight: 700; }
/* gfm task lists — the arrow bullet is replaced by an empty checkbox glyph */
.prose ul.task-list li::before { content: "\25A1"; color: var(--lab-cyan); }
.prose ul.task-list li input[type="checkbox"] { display: none; }
/* nested lists shouldn't re-number with the boxed counter */
.prose li ul { margin: 10px 0 0; }
.prose li ol { margin: 10px 0 0; }

.prose blockquote {
  margin: 22px 0; padding: 16px 22px; color: var(--lab-ink);
  border-left: 2px solid var(--lab-cyan);
  background-color: rgba(43,255,240,0.045);
  font-size: 14.5px;
}
.prose blockquote p { color: var(--lab-ink); margin: 0 0 10px; }
.prose blockquote p:last-child { margin-bottom: 0; }
.prose blockquote strong { color: var(--lab-cyan); }
.prose blockquote em { color: var(--lab-amber); font-style: italic; }

.prose code {
  font-family: 'JetBrains Mono', monospace; font-size: 0.9em;
  background: rgba(43,255,240,0.07); color: var(--lab-ink);
  padding: 1px 6px; border-radius: 2px; border: 1px solid rgba(43,255,240,0.12);
}
.prose pre {
  margin: 22px 0; padding: 20px 22px; overflow-x: auto;
  background-color: var(--lab-bg-2); border: 1px solid var(--lab-rule-2);
  border-left: 2px solid var(--lab-cyan);
  font-size: 12.5px; line-height: 1.55; color: var(--lab-ink-2);
  box-shadow: inset 0 1px 0 rgba(43,255,240,0.05);
}
.prose pre code { background: none; border: none; padding: 0; color: inherit; font-size: inherit; }

.prose hr { border: none; border-top: 1px solid var(--lab-rule); margin: 5vh 0; }

/* tables — wrapped in .tblwrap by the generator for horizontal scroll */
.tblwrap { margin: 22px 0; overflow-x: auto; border: 1px solid var(--lab-rule-2); }
.prose table { border-collapse: collapse; width: 100%; font-size: 13px; min-width: 460px; }
.prose thead th {
  text-align: left; padding: 12px 16px; color: var(--lab-magenta);
  background: rgba(255,43,214,0.06); border-bottom: 1px solid var(--lab-rule-2);
  font-weight: 500; letter-spacing: 0.04em; white-space: nowrap;
}
.prose tbody td { padding: 11px 16px; border-bottom: 1px solid var(--lab-rule); color: var(--lab-ink-2); vertical-align: top; }
.prose tbody tr:last-child td { border-bottom: none; }
.prose tbody tr:nth-child(even) td { background: rgba(255,255,255,0.012); }
.prose td b, .prose td strong { color: var(--lab-ink); font-weight: 500; }
.prose td code { font-size: 12px; }

/* ---------- chapter pager (prev / next) ---------- */
.pager {
  margin: 8vh 0 0; padding-top: 26px; border-top: 1px solid var(--lab-rule);
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 16px; align-items: stretch;
}
.pager a, .pager span {
  display: flex; flex-direction: column; gap: 4px; padding: 14px 18px;
  border: 1px solid var(--lab-rule-2); text-decoration: none;
  transition: border-color 150ms, background 150ms;
}
.pager a:hover { border-color: rgba(43,255,240,0.4); background: rgba(43,255,240,0.04); }
.pager .dir { font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--lab-dim); }
.pager .lbl { font-size: 13px; color: var(--lab-ink-2); }
.pager a:hover .lbl { color: var(--lab-cyan); }
.pager .prev { text-align: left; }
.pager .next { text-align: right; }
.pager .toc-link { align-items: center; justify-content: center; color: var(--lab-magenta); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; }
.pager .toc-link:hover { color: var(--lab-magenta); border-color: rgba(255,43,214,0.4); background: rgba(255,43,214,0.05); }
.pager .disabled { opacity: 0.3; }
@media (max-width: 560px) {
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
}

/* ---------- footer ---------- */
/* ---- doors: cross-links to the rest of the Lab (book landing) ---- */
.doors { margin: 9vh 0 0; }
.doors .doors-hd { display: block; color: var(--lab-dim); font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase; margin-bottom: 16px; }
.doors .grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 680px) { .doors .grid { grid-template-columns: repeat(3, 1fr); } }
.door {
  display: flex; flex-direction: column; text-decoration: none;
  padding: 22px 22px 20px; overflow: hidden;
  background-color: rgba(17, 17, 26, 0.86);
  border-top: 2px solid var(--lab-magenta);
  box-shadow:
    0 0 0 1px rgba(255,43,214,0.10),
    0 0 24px rgba(255,43,214,0.05),
    0 20px 48px rgba(0,0,0,0.45),
    inset 0 1px 0 rgba(43,255,240,0.08);
  transition: transform 200ms cubic-bezier(.19,1,.22,1), box-shadow 220ms, background-color 220ms;
}
.door:hover {
  transform: translateY(-3px);
  background-color: rgba(24, 24, 34, 0.92);
  box-shadow:
    0 0 0 1px rgba(255,43,214,0.30),
    0 0 40px rgba(255,43,214,0.14),
    0 26px 56px rgba(0,0,0,0.55),
    inset 0 1px 0 rgba(43,255,240,0.14);
}
.door .kicker { color: var(--lab-dim); font-size: 10.5px; letter-spacing: 0.2em; text-transform: uppercase; margin-bottom: 10px; }
.door .kicker b { color: var(--lab-cyan); font-weight: 500; }
.door h3 { margin: 0 0 9px; font-size: 17px; font-weight: 500; color: var(--lab-ink); letter-spacing: -0.01em; }
.door p { margin: 0 0 16px; font-size: 13px; line-height: 1.6; color: var(--lab-ink-2); flex-grow: 1; }
.door .go { display: inline-flex; align-items: center; gap: 8px; color: var(--lab-cyan); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; }
.door .go .arrow { transition: transform 200ms; }
.door:hover .go .arrow { transform: translateX(4px); }

footer {
  max-width: var(--measure); margin: 8vh auto 0; padding-top: 24px;
  border-top: 1px solid var(--lab-rule);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 11px; color: var(--lab-dim); letter-spacing: 0.2em; text-transform: uppercase;
}
footer a { color: var(--lab-dim); text-decoration: none; border: none; }
footer a:hover { color: var(--lab-cyan); }

@media (prefers-reduced-motion: reduce) { .wordmark .seal { animation: none; } html { scroll-behavior: auto; } }

/* ---------- print: a clean, light copy ---------- */
@media print {
  :root { --lab-ink: #111; --lab-ink-2: #222; --lab-dim: #555; }
  body { background: #fff; color: #111; font-size: 10.5pt; line-height: 1.5; }
  body::before, .bar, .pager, .secnav, footer .r { display: none !important; }
  .page { max-width: none; padding: 0; }
  main { max-width: none; }
  h1, .prose h2, .prose h3 { color: #000; text-shadow: none; }
  .prose h2 { border-left-color: #000; page-break-after: avoid; }
  .prose a { color: #000; border: none; }
  .prose em { color: #000; font-style: italic; }
  .pubnote, blockquote, .prose pre, .tblwrap { border-color: #ccc; background: #f6f6f6 !important; background-image: none !important; box-shadow: none !important; }
  .prose thead th { color: #000; background: #eee; }
  table, .prose pre, blockquote { page-break-inside: avoid; }
}