/* ──────────────────────────────────────────────────────────────
   myelin + cortex — blueprint stylesheet
   palette borrowed from the metafactory blueprint mockups.
   ────────────────────────────────────────────────────────────── */

:root {
  --paper: #f5f1e6;
  --paper-light: #faf5e5;
  --card: #fffcf1;
  --ink: #1a3a7a;
  --ink-dark: #1b2330;
  --accent: #c1321f;
  --muted: #6b6357;
  --grid: rgba(26, 58, 122, 0.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--paper);
  color: var(--ink-dark);
  line-height: 1.6;
  font-size: 15px;
  min-height: 100vh;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  z-index: 0;
}

main, header, footer { position: relative; z-index: 1; }

/* ── typography ─────────────────────────────────────────────── */

.display {
  font-family: "Space Grotesk", "Inter", sans-serif;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.mono {
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, Menlo, monospace;
}

h1, h2, h3 { font-family: "Space Grotesk", "Inter", sans-serif; line-height: 1.2; }

h1 { font-size: 2.5rem; margin-bottom: 1rem; }
h2 { font-size: 1.5rem; margin: 2rem 0 0.75rem; color: var(--ink); }
h3 { font-size: 1.15rem; margin: 1.5rem 0 0.5rem; }

p { margin: 0.75rem 0; }

a { color: var(--ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }

code {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.9em;
  background: var(--card);
  border: 1px solid var(--ink-dark);
  padding: 0 4px;
}

pre {
  font-family: "JetBrains Mono", monospace;
  background: var(--card);
  border: 1px solid var(--ink-dark);
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 1rem 0;
}

pre code { background: none; border: none; padding: 0; }

/* ── page container ─────────────────────────────────────────── */

.wrap { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }
.narrow { max-width: 760px; margin: 0 auto; padding: 0 1.5rem; }

/* ── header (drafting title block) ──────────────────────────── */

.site-header {
  border-bottom: 2px solid var(--ink-dark);
  background: var(--paper);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-mark {
  width: 38px;
  height: 38px;
  background: var(--ink);
  color: var(--paper);
  display: grid;
  place-items: center;
  font-family: "JetBrains Mono", monospace;
  font-weight: 700;
  font-size: 0.95rem;
}

.brand-name { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name .kicker {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  color: var(--ink);
  text-transform: uppercase;
}
.brand-name .title {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink-dark);
}

.site-nav { margin-left: auto; display: flex; gap: 1.5rem; }
.site-nav a {
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-dark);
}
.site-nav a:hover { color: var(--accent); }

/* drafting strip below header */
.ruler {
  border-top: 1px solid rgba(27, 35, 48, 0.25);
}
.ruler .wrap {
  display: flex;
  justify-content: space-between;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--ink);
  padding: 0.4rem 1.5rem;
  text-transform: uppercase;
}

/* ── hero ────────────────────────────────────────────────────── */

.hero {
  border-bottom: 2px solid var(--ink-dark);
  padding: 3.5rem 0 3rem;
  text-align: center;
}

.hero .fig {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.9rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  max-width: 820px;
  margin: 0 auto;
}
.hero h1 .accent { color: var(--accent); }

.hero .lead {
  max-width: 620px;
  margin: 1.25rem auto 0;
  color: var(--muted);
  font-size: 1rem;
}

.hero .cta-row {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: inherit;
  border: 1px solid var(--ink-dark);
  background: var(--card);
  color: var(--ink-dark);
  text-decoration: none;
  cursor: pointer;
}
.btn:hover { background: var(--paper-light); color: var(--accent); }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--ink-dark); color: var(--paper-light); }

/* ── stats strip ────────────────────────────────────────────── */

.figures {
  border-top: 2px solid var(--ink-dark);
  border-bottom: 2px solid var(--ink-dark);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--paper);
}
.figures > div {
  padding: 1.1rem 1rem;
  border-right: 1px solid var(--ink-dark);
  text-align: left;
}
.figures > div:last-child { border-right: none; }
.figures .num {
  font-family: "Space Grotesk", sans-serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
}
.figures .lbl {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  margin-top: 0.35rem;
  text-transform: uppercase;
}

/* ── content sections ───────────────────────────────────────── */

.section {
  padding: 3rem 0;
  border-bottom: 1px solid rgba(27, 35, 48, 0.18);
}

.section-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 1rem;
  text-align: center;
}

.cards {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--ink-dark);
  padding: 1.25rem 1.25rem 1.4rem;
}
.card .kicker {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}
.card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}
.card p { font-size: 0.92rem; color: var(--muted); margin: 0; }
.card .footer-link { display: inline-block; margin-top: 0.8rem; font-size: 0.85rem; }

/* ── prose pages ────────────────────────────────────────────── */

article.prose {
  padding: 2.5rem 0 4rem;
}
article.prose h1 { font-size: 2.2rem; }
article.prose h2 {
  border-top: 1px solid var(--ink-dark);
  padding-top: 1.5rem;
  margin-top: 2.5rem;
}
article.prose p, article.prose li { font-size: 1rem; }
article.prose ul, article.prose ol { padding-left: 1.5rem; margin: 0.75rem 0; }
article.prose li { margin: 0.3rem 0; }
article.prose blockquote {
  border-left: 4px solid var(--accent);
  background: var(--card);
  padding: 0.6rem 1rem;
  margin: 1rem 0;
  font-style: italic;
  color: var(--muted);
}

article.prose .meta {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

/* ── stack diagram (ASCII) ──────────────────────────────────── */

.stack {
  background: var(--card);
  border: 1px solid var(--ink-dark);
  padding: 1.25rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  line-height: 1.55;
  white-space: pre;
  overflow-x: auto;
  margin: 1.25rem 0;
}

/* ── stamp / pill ───────────────────────────────────────────── */

.stamp {
  display: inline-block;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  padding: 2px 8px;
  border: 1px solid currentColor;
  text-transform: uppercase;
  margin-right: 0.35rem;
}
.stamp-accent { color: var(--accent); }
.stamp-ink { color: var(--ink); }

/* ── blog list ──────────────────────────────────────────────── */

.post-list { list-style: none; padding: 0; margin: 1.5rem 0 0; }
.post-list li {
  border-top: 1px solid var(--ink-dark);
  padding: 1.1rem 0;
}
.post-list li:last-child { border-bottom: 1px solid var(--ink-dark); }
.post-list .date {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}
.post-list h3 { margin: 0.3rem 0 0.25rem; font-size: 1.15rem; }
.post-list h3 a { text-decoration: none; }
.post-list h3 a:hover { color: var(--accent); }
.post-list .excerpt { color: var(--muted); font-size: 0.95rem; }

/* ── footer (drafting title block) ──────────────────────────── */

.site-footer {
  border-top: 2px solid var(--ink-dark);
  background: var(--paper-light);
  padding: 2.5rem 0 1.5rem;
}
.site-footer .cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
.site-footer h4 {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  color: var(--ink);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}
.site-footer ul { list-style: none; padding: 0; }
.site-footer li { font-size: 0.92rem; margin: 0.25rem 0; }
.site-footer p { font-size: 0.85rem; color: var(--muted); }

.titleblock {
  border-top: 2px solid var(--ink-dark);
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
}
.titleblock > div {
  padding: 0.5rem 0.65rem;
  border-right: 1px solid rgba(27, 35, 48, 0.3);
}
.titleblock > div:last-child { border-right: none; }
.titleblock .lbl-tiny {
  display: block;
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 0.15rem;
}
.titleblock .val { font-weight: 700; color: var(--ink-dark); }
.titleblock .val.accent { color: var(--accent); }

.colophon {
  margin-top: 1rem;
  display: flex;
  justify-content: space-between;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}
.colophon .right { color: var(--accent); }

/* ── responsive ─────────────────────────────────────────────── */

@media (max-width: 760px) {
  .ruler .wrap { flex-wrap: wrap; gap: 0.25rem; }
  .figures { grid-template-columns: repeat(2, 1fr); }
  .figures > div:nth-child(2) { border-right: none; }
  .figures > div:nth-child(-n+2) { border-bottom: 1px solid var(--ink-dark); }
  .site-footer .cols { grid-template-columns: 1fr 1fr; }
  .titleblock { grid-template-columns: repeat(2, 1fr); }
  .site-nav { display: none; }
  .hero h1 { font-size: 1.8rem; }
}