/* ============================================================
   The Brain · brain.hellodilly.com
   Clean, friendly, light. Same family as hellodilly.com.
   No mono labels, no terminal aesthetics. Editorial product page.
   ============================================================ */

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

html, body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: #ffffff;
  color: #0a0e1c;
  overflow-x: hidden;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'ss01', 'cv11';
}
body { min-height: 100vh; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

:root {
  --bg: #ffffff;
  --bg-2: #f7f8fc;
  --bg-3: #eef0f7;
  --ink: #0a0e1c;
  --ink-2: #1a2138;
  --mute: #5b6585;
  --mute-2: #8a93af;
  --border: rgba(10, 14, 28, 0.08);
  --border-2: rgba(10, 14, 28, 0.16);
  --navy: #293F95;
  --navy-deep: #1f2c6e;
  --accent-soft: rgba(41, 63, 149, 0.06);
  --shadow-sm: 0 4px 14px rgba(41, 63, 149, 0.05);
  --shadow-md: 0 12px 30px rgba(41, 63, 149, 0.08);
}

::selection { background: rgba(41, 63, 149, 0.18); color: var(--ink); }

/* ── Nav ───────────────────────────────────────────────── */
.brain-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1.25rem;
  padding: 0.85rem clamp(1.25rem, 4vw, 2.25rem);
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.brain-nav-home {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  justify-self: start;
  transition: opacity 0.2s ease;
}
.brain-nav-home:hover { opacity: 0.78; }
.brain-nav-home img {
  height: clamp(40px, 6vw, 54px);
  width: auto;
}
.brain-nav-divider {
  font-size: 1rem;
  color: rgba(10, 14, 28, 0.25);
  margin: 0 0.1rem;
  font-weight: 300;
}
.brain-nav-tag {
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--navy);
}

.brain-nav-links {
  display: flex;
  gap: 0.15rem;
  justify-self: center;
  flex-wrap: wrap;
}
.brain-nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--mute);
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  white-space: nowrap;
  transition: color 0.15s ease, background 0.15s ease;
}
.brain-nav-links a:hover {
  color: var(--ink);
  background: rgba(10, 14, 28, 0.04);
}
.brain-nav-links a[aria-current="page"] {
  color: var(--ink);
  background: rgba(41, 63, 149, 0.08);
}

.brain-nav-back {
  justify-self: end;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--mute);
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.brain-nav-back:hover {
  color: var(--ink);
  border-color: var(--border-2);
  background: var(--bg-2);
}

@media (max-width: 900px) {
  .brain-nav {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
    row-gap: 0.5rem;
  }
  .brain-nav-back { grid-row: 1; grid-column: 2; justify-self: end; }
  .brain-nav-links {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: stretch;
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding: 0.55rem 0 0.25rem;
    border-top: 1px solid var(--border);
  }
  .brain-nav-links::-webkit-scrollbar { display: none; }
  .brain-nav-links a {
    flex-shrink: 0;
    padding: 0.4rem 0.7rem;
    font-size: 0.82rem;
  }
}

/* ── Hero ──────────────────────────────────────────────── */
.brain-hero {
  position: relative;
  padding: clamp(3.5rem, 8vw, 6rem) clamp(1.5rem, 5vw, 3rem) clamp(4rem, 8vw, 6rem);
  background: #ffffff;
  border-bottom: 1px solid var(--border);
}
.brain-hero-inner {
  max-width: 1140px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
@media (max-width: 900px) {
  .brain-hero-inner { grid-template-columns: 1fr; gap: 2.5rem; }
}

.brain-eyebrow,
.brain-section-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 1.1rem;
}

.brain-h1 {
  font-family: 'Inter', sans-serif;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--ink);
  margin-bottom: 1.25rem;
  max-width: 18ch;
}

.brain-lead {
  font-size: clamp(1rem, 1.2vw, 1.12rem);
  line-height: 1.65;
  color: var(--mute);
  max-width: 56ch;
  margin-bottom: 2rem;
}

.brain-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  margin-bottom: 2rem;
  max-width: 560px;
}
@media (max-width: 480px) {
  .brain-hero-stats { grid-template-columns: 1fr; gap: 0.8rem; }
}
.brain-stat { display: flex; flex-direction: column; gap: 0.2rem; }
.brain-stat-num {
  font-size: clamp(1.5rem, 2.2vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  color: var(--ink);
  line-height: 1;
}
.brain-stat-label {
  font-size: 0.78rem;
  color: var(--mute);
  line-height: 1.45;
}

.brain-hero-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.brain-cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 1.6rem;
  background: var(--navy);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid var(--navy);
  transition: transform 0.2s ease, background 0.2s ease;
}
.brain-cta-primary:hover {
  transform: translateY(-1px);
  background: var(--navy-deep);
}
.brain-cta-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.85rem 1.5rem;
  background: #fff;
  border: 1px solid var(--border-2);
  color: var(--navy);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.brain-cta-ghost:hover {
  border-color: var(--navy);
  background: var(--bg-2);
}

/* Hero face, same engine as the AI coach page */
.brain-hero-viz {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}
#brain-face-wrap {
  position: relative;
  z-index: 2;
  width: clamp(220px, 26vw, 340px);
  height: clamp(220px, 26vw, 340px);
  border-radius: 50%;
  background: #f6f7fb;
  border: 1px solid var(--border);
  box-shadow: 0 24px 60px rgba(41, 63, 149, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
}
#brain-face-wrap canvas {
  width: 100%;
  height: 100%;
  pointer-events: none;
  border-radius: 50%;
}
.brain-hero-caption {
  position: absolute;
  bottom: -1.6rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--mute);
}

/* ── Section primitives ──────────────────────────────── */
.brain-h2 {
  font-family: 'Inter', sans-serif;
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: 1rem;
  max-width: 24ch;
}
.brain-section-lead {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--mute);
  max-width: 64ch;
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
}
.brain-section-lead strong {
  color: var(--ink);
  font-weight: 600;
}

/* ── Architecture stack ──────────────────────────────── */
.brain-arch {
  padding: clamp(4rem, 9vw, 7rem) clamp(1.5rem, 5vw, 3rem);
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.brain-arch-inner { max-width: 1140px; margin: 0 auto; }
.brain-stack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}
.brain-layer {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1.75rem 1.6rem;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 16px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.brain-layer:hover {
  transform: translateY(-2px);
  border-color: var(--border-2);
  box-shadow: var(--shadow-md);
}
.brain-layer-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--navy);
  opacity: 0.78;
}
.brain-layer-title {
  font-family: 'Inter', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.18;
  color: var(--ink);
}
.brain-layer-desc {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--mute);
}
.brain-layer-link {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--navy);
  margin-top: 0.5rem;
}

/* ── Wiring stage (constellation) ────────────────────── */
.brain-wiring {
  padding: clamp(4rem, 9vw, 7rem) clamp(1.5rem, 5vw, 3rem);
  background: #ffffff;
  text-align: center;
}
.brain-wiring-inner { max-width: 980px; margin: 0 auto; }
.brain-wiring .brain-h2,
.brain-wiring .brain-section-lead {
  margin-left: auto;
  margin-right: auto;
}
.brain-wiring .brain-h2 { max-width: 26ch; }
.brain-wiring .brain-section-lead { max-width: 60ch; }

.brain-stage {
  position: relative;
  width: clamp(280px, 70vw, 540px);
  height: clamp(280px, 70vw, 540px);
  margin: 1.5rem auto 0;
}
.brain-stage-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.brain-stage-core {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: clamp(140px, 27vw, 200px);
  height: clamp(140px, 27vw, 200px);
  border-radius: 50%;
  background: #ffffff;
  border: 1px solid var(--border-2);
  box-shadow: 0 18px 44px rgba(41, 63, 149, 0.12);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0.65rem;
  z-index: 2;
}
.brain-stage-core-inner {
  width: clamp(70px, 13vw, 96px);
  height: clamp(70px, 13vw, 96px);
  border-radius: 50%;
  background: #f6f7fb;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.55rem;
}
.brain-stage-core-inner canvas {
  width: 100%; height: 100%;
  display: block;
  border-radius: 50%;
}
.brain-stage-core-label {
  font-family: 'Inter', sans-serif;
  font-size: clamp(0.92rem, 1.1vw, 1.02rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--ink);
  line-height: 1.1;
}
.brain-stage-core-sub {
  font-size: clamp(0.68rem, 0.85vw, 0.74rem);
  font-weight: 500;
  color: var(--mute);
  margin-top: 0.2rem;
  white-space: nowrap;
}

.brain-stage-node {
  position: absolute;
  transform: translate(-50%, -50%);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border-2);
  box-shadow: 0 6px 16px rgba(41, 63, 149, 0.1);
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  z-index: 3;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}
.brain-stage-node:hover {
  transform: translate(-50%, calc(-50% - 2px));
  border-color: var(--navy);
  color: var(--navy);
  box-shadow: 0 12px 28px rgba(41, 63, 149, 0.2), 0 0 0 4px rgba(41, 63, 149, 0.06);
}
.brain-stage-node:focus-visible {
  outline: 2px solid var(--navy);
  outline-offset: 3px;
}

/* 6 nodes at 60° intervals around a 41% radius from center. */
.brain-stage-node[data-i="0"] { top:  9%;   left: 50%;   }   /*   0° · top */
.brain-stage-node[data-i="1"] { top: 29.5%; left: 85.5%; }   /*  60° · upper-right */
.brain-stage-node[data-i="2"] { top: 70.5%; left: 85.5%; }   /* 120° · lower-right */
.brain-stage-node[data-i="3"] { top: 91%;   left: 50%;   }   /* 180° · bottom */
.brain-stage-node[data-i="4"] { top: 70.5%; left: 14.5%; }   /* 240° · lower-left */
.brain-stage-node[data-i="5"] { top: 29.5%; left: 14.5%; }   /* 300° · upper-left */

.brain-legend {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.brain-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--mute);
}
.brain-legend-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.brain-legend-dot--out { background: #00b4cc; }
.brain-legend-dot--in {
  background: #5b47ff;
  box-shadow: 0 0 10px rgba(91, 71, 255, 0.6);
}

/* ── Moments ─────────────────────────────────────────── */
.brain-moments {
  padding: clamp(4rem, 9vw, 7rem) clamp(1.5rem, 5vw, 3rem);
  background: var(--bg-2);
  border-top: 1px solid var(--border);
}
.brain-moments-inner { max-width: 1140px; margin: 0 auto; }

.brain-moments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 1rem;
}
.brain-moment {
  padding: 1.5rem 1.6rem 1.6rem;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.brain-moment:hover {
  border-color: var(--border-2);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.brain-moment-flow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--navy);
  opacity: 0.78;
}
.brain-moment-arrow { opacity: 0.55; font-size: 0.95rem; }

.brain-moment-title {
  font-family: 'Inter', sans-serif;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--ink);
}
.brain-moment-desc {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--mute);
}

/* ── Data flow (numbered steps) ──────────────────────── */
.brain-flow {
  padding: clamp(4rem, 9vw, 7rem) clamp(1.5rem, 5vw, 3rem);
  background: #ffffff;
  border-top: 1px solid var(--border);
}
.brain-flow-inner { max-width: 880px; margin: 0 auto; }
.brain-flow-steps {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 1rem;
}
.brain-flow-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.25rem;
  padding: 1.5rem 1.6rem;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 14px;
}
.brain-flow-num {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--navy);
  background: rgba(41, 63, 149, 0.08);
  border-radius: 999px;
  min-width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  letter-spacing: -0.01em;
  padding: 0 0.55rem;
}
.brain-flow-body h4 {
  font-family: 'Inter', sans-serif;
  font-size: 1.06rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin-bottom: 0.4rem;
}
.brain-flow-body p {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--mute);
}

/* ── Thesis ──────────────────────────────────────────── */
.brain-thesis {
  padding: clamp(4rem, 10vw, 8rem) clamp(1.5rem, 5vw, 3rem);
  background: var(--bg-2);
  text-align: center;
  border-top: 1px solid var(--border);
}
.brain-thesis-inner { max-width: 760px; margin: 0 auto; }
.brain-thesis-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 1.25rem;
}
.brain-thesis-h2 {
  font-family: 'Inter', sans-serif;
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.15;
  color: var(--ink);
  margin-bottom: 1.5rem;
}
.brain-thesis-body {
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--mute);
  max-width: 58ch;
  margin: 0 auto 2rem;
}
.brain-thesis-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.95rem 1.85rem;
  background: var(--navy);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 999px;
  transition: transform 0.2s ease, background 0.2s ease;
}
.brain-thesis-cta:hover {
  transform: translateY(-2px);
  background: var(--navy-deep);
}

/* ── Footer ──────────────────────────────────────────── */
.brain-foot {
  background: #ffffff;
  border-top: 1px solid var(--border);
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 5vw, 3rem) 0;
}
.brain-foot-inner {
  max-width: 1140px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2.5rem;
  padding-bottom: 2.5rem;
}
@media (max-width: 760px) {
  .brain-foot-inner { grid-template-columns: 1fr 1fr; gap: 1.75rem; }
}
.brain-foot-col {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.brain-foot-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--navy);
  opacity: 0.7;
  margin-bottom: 0.3rem;
}
.brain-foot-col a {
  font-size: 0.9rem;
  color: var(--mute);
  transition: color 0.15s ease;
}
.brain-foot-col a:hover { color: var(--ink); }
.brain-foot-col--brand img {
  height: 36px;
  width: auto;
  margin-bottom: 0.4rem;
}
.brain-foot-small {
  font-size: 0.82rem;
  color: var(--mute-2);
  line-height: 1.55;
  max-width: 22ch;
}
.brain-foot-strip {
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
  text-align: center;
  font-size: 0.78rem;
  color: var(--mute-2);
}

/* ── Article shell (sub-pages) ──────────────────────── */
.brain-body .page-hero {
  position: relative;
  padding: clamp(3rem, 7vw, 5rem) clamp(1.5rem, 5vw, 3rem) clamp(2rem, 4vw, 3rem);
  text-align: center;
  max-width: 920px;
  margin: 0 auto;
  background: #ffffff;
}
.brain-body .page-hero .eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 1rem;
}
.brain-body .page-hero h1 {
  font-size: clamp(2rem, 4.4vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
  color: var(--ink);
  margin-bottom: 1rem;
}
.brain-body .page-hero .lead {
  font-size: clamp(1rem, 1.3vw, 1.12rem);
  line-height: 1.65;
  color: var(--mute);
  max-width: 60ch;
  margin: 0 auto;
}

.brain-body .crumbs {
  max-width: 920px;
  margin: 0 auto;
  padding: 1.2rem clamp(1.5rem, 5vw, 3rem) 0;
  font-size: 0.82rem;
  color: var(--mute-2);
}
.brain-body .crumbs a { color: var(--navy); font-weight: 500; }

.brain-body .article-shell {
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.5rem, 5vw, 3rem) clamp(4rem, 8vw, 6rem);
  background: #ffffff;
}
.brain-body .article-head { margin-bottom: 2.5rem; }
.brain-body .meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.25rem;
}
.brain-body .badge {
  font-size: 0.74rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--mute);
}
.brain-body .badge-good {
  color: var(--navy);
  background: rgba(41, 63, 149, 0.06);
  border-color: rgba(41, 63, 149, 0.18);
}
.brain-body .badge-warn {
  color: #b45309;
  background: rgba(180, 83, 9, 0.06);
  border-color: rgba(180, 83, 9, 0.22);
}

.brain-body .summary {
  font-size: 1.04rem;
  line-height: 1.7;
  color: var(--mute);
  max-width: 64ch;
}

.brain-body .article-body {
  display: grid;
  gap: 1.5rem;
}
.brain-body .article-body section {
  padding: 1.75rem 1.75rem 1.85rem;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 14px;
}
.brain-body .article-body h2 {
  font-family: 'Inter', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin-bottom: 0.85rem;
}
.brain-body .article-body h3 {
  font-size: 1.04rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.55rem;
}
.brain-body .article-body p,
.brain-body .article-body li {
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--mute);
}
.brain-body .article-body p { margin-bottom: 0.85rem; }
.brain-body .article-body p:last-child { margin-bottom: 0; }
.brain-body .article-body strong { color: var(--ink); font-weight: 600; }
.brain-body .article-body em {
  font-style: normal;
  color: var(--navy);
  font-weight: 500;
}
.brain-body .article-body ul,
.brain-body .article-body ol {
  padding-left: 1.2rem;
  display: grid;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}
.brain-body .article-body code {
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 0.85em;
  background: var(--bg-3);
  color: var(--ink);
  padding: 0.12rem 0.4rem;
  border-radius: 4px;
}
.brain-body .pull-quote {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--ink);
  border-left: 3px solid var(--navy);
  padding: 0.8rem 0 0.8rem 1.25rem;
  margin: 1.25rem 0;
}
.brain-body .ledger-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}
.brain-body .ledger-table th,
.brain-body .ledger-table td {
  text-align: left;
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  color: var(--mute);
}
.brain-body .ledger-table th {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--bg-2);
}

/* Article-body component primitives used by sub-pages: subgrid/mini
   for inline detail blocks; related-grid/related-card for cross-link
   cards at the bottom. These need explicit flex/grid rules, without
   them the inline <span class="label/title/desc/arrow"> children
   collapse into a single mashed paragraph. */
.brain-body .article-body .subgrid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.85rem;
  margin-top: 1rem;
}
.brain-body .article-body .mini {
  padding: 1rem 1.1rem 1.05rem;
  border-radius: 12px;
  background: var(--bg-2);
  border: 1px solid var(--border);
}
.brain-body .article-body .mini strong {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--ink);
}
.brain-body .article-body .mini p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--mute);
}

.brain-body .related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.brain-body .related-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.4rem 1.4rem 1.5rem;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 14px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.brain-body .related-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-2);
  box-shadow: var(--shadow-md);
}
.brain-body .related-card .label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--navy);
  opacity: 0.7;
}
.brain-body .related-card .title {
  font-family: 'Inter', sans-serif;
  font-size: 1.04rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.3;
  color: var(--ink);
}
.brain-body .related-card .desc {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--mute);
}
.brain-body .related-card .arrow {
  margin-top: auto;
  padding-top: 0.4rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--navy);
}

.brain-body footer,
.brain-body .foot {
  max-width: 920px;
  margin: 0 auto;
  padding: 2rem clamp(1.5rem, 5vw, 3rem) 3rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--mute-2);
}
.brain-body footer a,
.brain-body .foot a { color: var(--navy); font-weight: 500; }

/* ── Legacy compatibility for old sub-page nav markup ─── */
.brain-body .nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1.25rem;
  padding: 0.85rem clamp(1.25rem, 4vw, 2.25rem);
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.brain-body .nav-home {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  justify-self: start;
}
.brain-body .nav-home img {
  height: clamp(40px, 6vw, 54px);
}
.brain-body .nav-links {
  display: flex;
  gap: 0.1rem;
  justify-self: center;
}
.brain-body .nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--mute);
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  transition: color 0.15s ease, background 0.15s ease;
}
.brain-body .nav-links a:hover {
  color: var(--ink);
  background: rgba(10, 14, 28, 0.04);
}
.brain-body .nav-links a[aria-current="page"] {
  color: var(--ink);
  background: rgba(41, 63, 149, 0.08);
}

@media (max-width: 900px) {
  .brain-body .nav { grid-template-columns: 1fr; gap: 0.5rem; }
  .brain-body .nav-links { display: none; }
}

/* ── Mobile polish ──────────────────────────────────── */
@media (max-width: 760px) {
  .brain-hero-viz { order: -1; min-height: 240px; margin-bottom: 1rem; }
  #brain-face-wrap { width: 220px; height: 220px; }
  .brain-hero-cta-row { flex-direction: column; }
  .brain-hero-cta-row .brain-cta-primary,
  .brain-hero-cta-row .brain-cta-ghost { width: 100%; justify-content: center; }
  .brain-hero-stats { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .brain-hero-stats .brain-stat:nth-child(3) { grid-column: 1 / -1; }

  .brain-moments-grid { grid-template-columns: 1fr; }
  .brain-flow-step { grid-template-columns: 1fr; gap: 0.75rem; }
  .brain-flow-num { justify-self: start; }

  .brain-stack { grid-template-columns: 1fr; }
  .brain-layer { padding: 1.4rem 1.3rem; }

  .brain-stage-node {
    font-size: 0.72rem;
    padding: 0.4rem 0.7rem;
  }
}

@media (max-width: 480px) {
  .brain-h1 { font-size: clamp(2rem, 9vw, 2.5rem); line-height: 1.05; }
  .brain-h2 { font-size: clamp(1.55rem, 7vw, 2rem); }
  .brain-lead, .brain-section-lead { font-size: 0.95rem; }
  .brain-hero-stats { grid-template-columns: 1fr; }
  .brain-hero-stats .brain-stat:nth-child(3) { grid-column: auto; }
  .brain-stat-num { font-size: 1.55rem; }
  .brain-foot-inner { grid-template-columns: 1fr; gap: 1.5rem; }
  .brain-thesis-cta { padding: 0.85rem 1.6rem; font-size: 0.9rem; }
  /* 6-node constellation: nudge inward on small screens so labels don't clip */
  .brain-stage-node[data-i="1"] { top: 31%;  left: 82%; }
  .brain-stage-node[data-i="2"] { top: 69%;  left: 82%; }
  .brain-stage-node[data-i="4"] { top: 69%;  left: 18%; }
  .brain-stage-node[data-i="5"] { top: 31%;  left: 18%; }
}

/* ── Reduced motion ───────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; }
}