/* ============================================================
   THE THINKING NOOK — design system
   Concept: a navigator's chart room. Ink, brass, and parchment.
   The Nook Current™ runs through the site as a thin flowing line —
   the same line a captain would trace across a chart.

   Palette is deliberately restricted to 3 colours (ink, paper, brass),
   1 typeface (IBM Plex Sans), and 3 font sizes (sm / base / lg).
   ============================================================ */

:root{
  --ink:        #16213A;   /* dark background + primary text on light */
  --paper:      #F1ECDC;   /* light background + primary text on dark */
  --brass:      #A9772F;   /* single accent — labels, links, CTAs */

  --line:       rgba(22,33,58,0.16);
  --line-soft:  rgba(22,33,58,0.09);
  --paper-line: rgba(241,236,220,0.18);

  --font: 'IBM Plex Sans', -apple-system, sans-serif;

  --fs-sm:   14px;
  --fs-base: 17px;
  --fs-lg:   clamp(28px, 4vw, 46px);

  --max: 1180px;
  --gutter: clamp(20px, 5vw, 64px);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body{
  margin:0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--fs-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration: none; }
ul{ list-style:none; margin:0; padding:0; }

h1,h2,h3,h4{
  font-family: var(--font);
  font-weight: 600;
  line-height: 1.12;
  margin: 0;
  letter-spacing: -0.01em;
  font-size: var(--fs-lg);
  text-wrap: balance;
}

p{ text-wrap: pretty; }

/* Balanced card/grid rhythm: equal-height cards in a row so
   short headers/copy don't leave one card visually taller than its neighbours. */
.grid-2, .grid-3{ align-items: stretch; }
.card{ display:flex; flex-direction:column; }

::selection{ background: var(--brass); color: var(--paper); }

:focus-visible{
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

.wrap{
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.eyebrow{
  font-family: var(--font);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brass);
  display: flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before{
  content:'';
  width: 22px;
  height: 1px;
  background: var(--brass);
  display:inline-block;
}

/* ---------------- HEADER ---------------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(241,236,220,0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
/* Top row: brand + CTA only, per design brief */
.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 16px var(--gutter);
  max-width: var(--max);
  margin: 0 auto;
}
.brand{
  font-family: var(--font);
  font-size: var(--fs-base);
  font-weight: 600;
  display:flex;
  align-items:center;
  gap:10px;
}
.brand .mark{
  display:block;
  border-radius: 6px;
  flex-shrink: 0;
}
.brand-sub{
  display:block;
  font-family: var(--font);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--ink);
  opacity: 0.65;
  text-transform: uppercase;
  margin-top: 1px;
}
.nav-cta{ display:flex; align-items:center; gap:14px; }
.nav-toggle{
  display:none;
  background:none; border:none; cursor:pointer;
  flex-direction:column; gap:5px; padding: 6px;
}
.nav-toggle span{ width:22px; height:1.5px; background:var(--ink); display:block; }

/* Second row: left-aligned page navigation with subsection dropdowns */
.subnav{
  border-top: 1px solid var(--line-soft);
  background: var(--paper);
}
.subnav-links{
  display:flex;
  justify-content:flex-start;
  gap: 4px;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.subnav-links > li{ position:relative; }
.subnav-links > li > a{
  display:block;
  font-size: var(--fs-sm);
  font-weight: 600;
  padding: 12px 14px;
  position: relative;
}
.subnav-links > li > a::after{
  content:'';
  position:absolute;
  left:14px; right:14px; bottom:6px;
  height:1px;
  background: var(--brass);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.subnav-links > li > a:hover::after,
.subnav-links > li > a[aria-current="page"]::after{ transform: scaleX(1); }
.subnav-links > li > a[aria-current="page"]{ color: var(--brass); }

.dropdown{
  position:absolute;
  top:100%; left:0;
  min-width: 260px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 12px 24px rgba(22,33,58,0.12);
  padding: 8px 0;
  display:none;
  flex-direction:column;
  z-index: 50;
}
.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown{ display:flex; }
.dropdown a{
  display:block;
  font-size: var(--fs-sm);
  font-weight: 400;
  padding: 10px 18px;
  color: var(--ink);
}
.dropdown a:hover{ background: var(--paper-line); color: var(--brass); }

.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family: var(--font);
  font-weight: 600;
  font-size: var(--fs-sm);
  padding: 12px 22px;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor:pointer;
  transition: all .2s ease;
  white-space: nowrap;
}
.btn-brass{ background: var(--brass); color: var(--paper); }
.btn-brass:hover{ background: var(--ink); }
.btn-line{ border-color: var(--ink); color: var(--ink); }
.btn-line:hover{ background: var(--ink); color: var(--paper); }
.btn-ghost-light{ border-color: var(--paper-line); color: var(--paper); }
.btn-ghost-light:hover{ background: var(--paper); color: var(--ink); }
.btn-sm{ padding: 9px 16px; font-size: var(--fs-sm); }

/* ---------------- CURRENT LINE (signature motif) ---------------- */
.current-line-wrap{ width:100%; overflow:hidden; line-height:0; }
.current-path{
  fill:none;
  stroke: var(--brass);
  stroke-width: 1.5;
  stroke-dasharray: 6 2000;
  animation: draw 3.2s ease-out forwards;
}
@keyframes draw{
  to{ stroke-dasharray: 2000 0; }
}
@media (prefers-reduced-motion: reduce){
  .current-path{ stroke-dasharray: 2000 0; animation:none; }
}
.current-line-wrap.on-ink{ background: var(--ink); }
.current-line-wrap.on-ink .current-path{ stroke: var(--brass); }
.current-line-wrap.on-paper{ background: var(--paper); }

/* ---------------- HERO ---------------- */
.hero{
  background: var(--ink);
  color: var(--paper);
  position: relative;
  overflow:hidden;
  padding: 64px 0 0;
}
.hero-inner{
  max-width: var(--max);
  margin:0 auto;
  padding: 0 var(--gutter) 60px;
  display:grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items:end;
}
.hero h1{
  font-size: var(--fs-lg);
  color: var(--paper);
}
.hero h1 em{ color: var(--brass); font-style: italic; }
.hero-lede{
  font-size: var(--fs-base);
  color: rgba(241,236,220,0.78);
  max-width: 40ch;
  margin-top: 20px;
}
.hero-cta{ display:flex; gap:14px; margin-top: 32px; flex-wrap:wrap; }
.hero-side{
  border-left: 1px solid var(--paper-line);
  padding-left: 28px;
  font-size: var(--fs-sm);
  color: rgba(241,236,220,0.7);
}
.hero-side p{ margin: 0 0 14px; }
.hero-side strong{ color: var(--paper); display:block; font-family: var(--font); font-size:var(--fs-sm); letter-spacing:.1em; text-transform:uppercase; margin-bottom:6px; }

/* ---------------- SECTIONS ---------------- */
section{ padding: 56px 0; }
.section-tight{ padding: 40px 0; }
.section-head{ max-width: 640px; margin-bottom: 32px; }
.section-head h2{ font-size: var(--fs-lg); margin-top: 14px; }
.section-head p{ margin-top: 16px; font-size: var(--fs-base); color: rgba(22,33,58,0.72); }

.divider{
  height:1px;
  background: var(--line);
  border:none;
  margin:0;
}

.bg-ink{ background: var(--ink); color: var(--paper); }
.bg-ink .eyebrow{ color: var(--brass); }
.bg-ink .eyebrow::before{ background: var(--brass); }
.bg-ink .section-head p{ color: rgba(241,236,220,0.75); }
.bg-dim{ background: var(--paper); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }

/* ---------------- GRIDS / CARDS ---------------- */
.grid-3{ display:grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.grid-2{ display:grid; grid-template-columns: repeat(2,1fr); gap: 22px; }

.card{
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 26px 24px;
  position: relative;
}
.bg-ink .card{ background: var(--ink); border: 1px solid var(--paper-line); }
.card .num{
  font-family: var(--font);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--brass);
  letter-spacing: .1em;
}
.card h3{ font-size: var(--fs-lg); margin-top: 12px; }
.card p{ margin-top: 12px; font-size: var(--fs-sm); color: rgba(22,33,58,0.72); }
.bg-ink .card p{ color: rgba(241,236,220,0.72); }

.tag{
  font-family: var(--font);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--brass);
  border: 1px solid var(--brass);
  padding: 3px 9px;
  display:inline-block;
}

/* ---------------- GROWTH REALITY / SPLIT ---------------- */
.split{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items:start;
}
.split blockquote{
  font-family: var(--font);
  font-style: italic;
  font-weight: 600;
  font-size: var(--fs-base);
  line-height:1.5;
  margin:0;
  color: var(--brass);
}
.bg-ink .split blockquote{ color: var(--brass); }
.split-list{ display:flex; flex-direction:column; gap:20px; margin-top: 24px; }
.split-list li{ display:flex; gap:14px; font-size:var(--fs-sm); color: rgba(22,33,58,0.72); }
.bg-ink .split-list li{ color: rgba(241,236,220,0.75); }
.split-list li .dot{ width:5px; height:5px; border-radius:50%; background: var(--brass); margin-top:8px; flex-shrink:0; }

/* ---------------- CTA BAND ---------------- */
.cta-band{
  background: var(--ink);
  color: var(--paper);
  padding: 48px 0;
  text-align:center;
}
.cta-band h2{ color:var(--paper); font-size: var(--fs-lg); }
.cta-band p{ margin-top:14px; opacity:.85; max-width: 46ch; margin-left:auto; margin-right:auto; font-size: var(--fs-base); }
.cta-band .hero-cta{ justify-content:center; margin-top: 26px; }
.cta-band .btn-line{ border-color: var(--paper); color: var(--paper); }
.cta-band .btn-line:hover{ background: var(--paper); color: var(--ink); }
.cta-band .btn-brass:hover{ background: var(--paper); color: var(--ink); }

/* ---------------- FOOTER ---------------- */
footer{
  background: var(--ink);
  color: rgba(241,236,220,0.65);
  padding: 56px 0 28px;
  font-size: var(--fs-sm);
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--paper-line);
}
.footer-grid h4{
  font-family: var(--font);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing:.1em;
  text-transform:uppercase;
  color: var(--paper);
  margin-bottom: 16px;
}
.footer-grid ul{ display:flex; flex-direction:column; gap:10px; }
.footer-grid a:hover{ color: var(--brass); }
.footer-brand{ font-family: var(--font); font-weight:600; font-size:var(--fs-base); color:var(--paper); }
.footer-tag{ margin-top:10px; max-width: 32ch; }
.footer-bottom{
  display:flex; justify-content:space-between; align-items:center;
  padding-top: 22px; font-size: var(--fs-sm); flex-wrap:wrap; gap:10px;
}

/* ---------------- PAGE HEADER (interior pages) ---------------- */
.page-hero{
  background: var(--ink);
  color: var(--paper);
  padding: 48px 0 40px;
}
.page-hero h1{ color: var(--paper); font-size: var(--fs-lg); margin-top:14px; }
.page-hero p{ margin-top:16px; font-size:var(--fs-base); max-width:56ch; color: rgba(241,236,220,0.78); }
.page-hero .beat-group p{ color: rgba(241,236,220,0.78); }

/* ---------------- HIERARCHY DIAGRAM (Operating System page) ---------------- */
.hierarchy{
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 40px clamp(20px,4vw,56px);
}
.hierarchy-top{
  text-align:center;
  padding-bottom: 28px;
  margin-bottom: 32px;
  border-bottom: 1px dashed var(--line);
}
.hierarchy-top .eyebrow{ justify-content:center; }
.hierarchy-top h3{ font-size: var(--fs-lg); margin-top:8px; }
.hierarchy-top p{ font-size:var(--fs-sm); color:rgba(22,33,58,0.72); margin-top:6px; }
.hierarchy-branches{ display:grid; grid-template-columns: repeat(auto-fit, minmax(170px,1fr)); gap: 22px; }
.branch{ text-align:center; position:relative; padding-top: 26px; }
.branch::before{
  content:'';
  position:absolute; top:0; left:50%;
  width:1px; height:22px;
  background: var(--brass);
}
.branch .tag{ margin-bottom:10px; }
.branch h4{ font-size:var(--fs-base); }
.branch p{ font-size:var(--fs-sm); color:rgba(22,33,58,0.72); margin-top:8px; }

/* ---------------- STEPS (S.T.E.P.S.) ---------------- */
.steps{ display:flex; flex-direction:column; }
.step{
  display:grid;
  grid-template-columns: 90px 1fr;
  gap: 28px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  align-items:start;
}
.step:last-child{ border-bottom: 1px solid var(--line); }
.step .letter{
  font-family: var(--font);
  font-style: italic;
  font-weight: 600;
  font-size: var(--fs-lg);
  color: var(--brass);
  line-height:1;
}
.step h3{ font-size: var(--fs-base); }
.step .step-word{ font-family:var(--font); font-size:var(--fs-sm); font-weight:600; letter-spacing:.1em; text-transform:uppercase; color:var(--brass); margin-bottom:6px; display:block; }
.step p{ margin-top:10px; font-size:var(--fs-sm); color:rgba(22,33,58,0.72); max-width:60ch; }

/* ---------------- SOLUTIONS ---------------- */
.solution-row{
  display:grid;
  grid-template-columns: 320px 1fr;
  gap: 40px;
  padding: 36px 0;
  border-top: 1px solid var(--line);
}
.solution-row:last-child{ border-bottom: 1px solid var(--line); }
.solution-row .eyebrow{ margin-bottom: 10px; }
.solution-row h3{ font-size: var(--fs-lg); }
.solution-meta p{ font-size:var(--fs-sm); color:rgba(22,33,58,0.72); margin-top:14px; }
.solution-body p{ font-size:var(--fs-base); color:rgba(22,33,58,0.72); max-width: 62ch; }
.solution-body .split-list{ margin-top:22px; }

/* ---------------- INSIGHTS ---------------- */
.filter-bar{ display:flex; gap:10px; flex-wrap:wrap; margin-bottom: 40px; }
.filter-btn{
  font-family: var(--font);
  font-size: var(--fs-sm);
  font-weight:600;
  letter-spacing:.06em;
  text-transform:uppercase;
  padding: 9px 16px;
  border: 1px solid var(--line);
  background: transparent;
  cursor:pointer;
  color: rgba(22,33,58,0.72);
  transition: all .2s ease;
}
.filter-btn.active, .filter-btn:hover{ background: var(--ink); color: var(--paper); border-color: var(--ink); }
.insight-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap: 26px; }
.insight-card{
  border: 1px solid var(--line);
  padding: 26px;
  display:flex; flex-direction:column; height:100%;
  transition: border-color .2s ease;
}
.insight-card:hover{ border-color: var(--brass); }
.insight-card .tag{ align-self:flex-start; }
.insight-card h3{ font-size:var(--fs-base); margin-top:16px; }
.insight-card p{ font-size:var(--fs-sm); color:rgba(22,33,58,0.72); margin-top:10px; flex-grow:1; }
.insight-card .meta{ font-family:var(--font); font-size:var(--fs-sm); color:var(--brass); margin-top:16px; letter-spacing:.05em; }
.insight-card.hidden{ display:none; }

/* ---------------- ABOUT ---------------- */
.timeline{ display:flex; flex-direction:column; }
.tl-row{
  display:grid; grid-template-columns: 140px 1fr; gap: 28px;
  padding: 26px 0; border-top:1px solid var(--line);
}
.tl-row:last-child{ border-bottom:1px solid var(--line); }
.tl-row .yr{ font-family:var(--font); font-weight:600; font-size:var(--fs-sm); color:var(--brass); }
.tl-row h4{ font-size:var(--fs-base); }
.tl-row p{ font-size:var(--fs-sm); color:rgba(22,33,58,0.72); margin-top:8px; }

.pull-quote{
  font-family: var(--font);
  font-style: italic;
  font-weight: 600;
  font-size: var(--fs-base);
  line-height:1.6;
  color: var(--brass);
  border-left: 2px solid var(--brass);
  padding-left: 28px;
  margin: 0;
}

/* ---------------- BOOK / FORM PAGE ---------------- */
.book-grid{ display:grid; grid-template-columns: 1fr 1fr; gap:56px; align-items:start; }
.option-card{
  border:1px solid var(--line);
  padding:30px;
  margin-bottom: 20px;
  cursor:pointer;
  transition: all .2s ease;
}
.option-card:hover, .option-card.active{ border-color: var(--brass); background: var(--paper); }
.option-card h3{ font-size:var(--fs-base); }
.option-card p{ font-size:var(--fs-sm); color:rgba(22,33,58,0.72); margin-top:8px; }
.option-card .tag{ margin-bottom:12px; }

form{ display:flex; flex-direction:column; gap:18px; }
.field{ display:flex; flex-direction:column; gap:8px; }
.field label{ font-family:var(--font); font-size:var(--fs-sm); font-weight:600; text-transform:uppercase; letter-spacing:.08em; color:rgba(22,33,58,0.72); }
.field input, .field select, .field textarea{
  font-family: var(--font);
  font-size:var(--fs-sm);
  padding: 12px 14px;
  border:1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius:2px;
}
.field textarea{ resize:vertical; min-height:100px; }
.field input:focus, .field select:focus, .field textarea:focus{ border-color: var(--brass); }
.form-note{ font-size:var(--fs-sm); color:rgba(22,33,58,0.72); margin-top:-4px; }

.stat-strip{ display:grid; grid-template-columns: repeat(3,1fr); gap:24px; margin-top:40px; }
.stat{ border-top:1px solid var(--line); padding-top:14px; }
.stat .n{ font-family:var(--font); font-weight:700; font-size:var(--fs-base); color:var(--brass); letter-spacing:.02em; }
.stat .l{ font-size:var(--fs-sm); color:rgba(22,33,58,0.72); margin-top:4px; }

/* ---------------- EMAIL READY MODAL (popup shown after "Prepare My Email") ---------------- */
.email-modal-backdrop{
  display:none;
  position:fixed; inset:0;
  background: rgba(22,33,58,0.6);
  z-index: 300;
  align-items:center; justify-content:center;
  padding: 20px;
}
.email-modal-backdrop.open{ display:flex; }
.email-modal{
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: 0 24px 48px rgba(22,33,58,0.3);
  max-width: 440px;
  width: 100%;
  padding: 30px 28px 28px;
  position: relative;
  animation: email-modal-in .18s ease;
}
@keyframes email-modal-in{
  from{ opacity:0; transform: translateY(8px); }
  to{ opacity:1; transform: translateY(0); }
}
.email-modal h4{
  font-family: var(--font);
  font-weight: 600;
  font-size: var(--fs-base);
  color: var(--ink);
  margin-bottom: 10px;
  padding-right: 24px;
}
.email-modal .form-note{ margin-top:0; margin-bottom:16px; color: rgba(22,33,58,0.72); }
.email-modal-close{
  position:absolute; top:14px; right:14px;
  width:30px; height:30px;
  display:flex; align-items:center; justify-content:center;
  background:none; border:none; cursor:pointer;
  color: var(--ink); font-size:22px; line-height:1; font-family:var(--font);
}
.email-modal-close:hover{ color: var(--brass); }
.email-modal-actions{ display:flex; gap:10px; flex-wrap:wrap; }

/* ---------------- MANIFESTO / BEAT COPY (Home page long-form sections) ---------------- */
.prose-beats{ max-width: 640px; }
.beat-group{ margin-bottom: 20px; }
.beat-group:last-child{ margin-bottom: 0; }
.beat-group p{ margin:0 0 6px; font-size:var(--fs-base); line-height:1.55; color:rgba(22,33,58,0.72); }
.beat-group p:last-child{ margin-bottom:0; }
.bg-ink .beat-group p{ color: rgba(241,236,220,0.8); }

.beat-line{
  font-family: var(--font);
  font-style: italic;
  font-weight: 600;
  font-size: var(--fs-base);
  line-height: 1.5;
  color: var(--ink);
  margin: 20px 0;
  max-width: 40ch;
}
.bg-ink .beat-line{ color: var(--paper); }
.beat-line.accent{ color: var(--brass); }
.bg-ink .beat-line.accent{ color: var(--brass); }

/* Progress Capacity Cycle */
.cycle-flow{ display:flex; flex-wrap:wrap; align-items:center; gap: 10px 6px; }
.cycle-chip{
  font-family: var(--font);
  font-size: var(--fs-sm);
  font-weight:600;
  letter-spacing: .04em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  padding: 11px 15px;
  color: var(--ink);
  background: var(--paper);
}
.bg-ink .cycle-chip{ border-color: var(--paper-line); color: var(--paper); background: transparent; }
.cycle-arrow{ color: var(--brass); font-size: var(--fs-sm); flex-shrink:0; }
.bg-ink .cycle-arrow{ color: var(--brass); }
.cycle-loop-note{
  font-family: var(--font);
  font-size: var(--fs-sm);
  font-weight:600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--brass);
  margin-top: 18px;
}

/* Before / After */
.state-card{ border: 1px solid var(--line); padding: 32px 28px; height:100%; }
.bg-ink .state-card{ border-color: var(--paper-line); }
.state-card .eyebrow{ margin-bottom: 18px; }
.state-card p{ font-size:var(--fs-sm); line-height:1.6; margin:0 0 10px; color: rgba(22,33,58,0.72); }
.bg-ink .state-card p{ color: rgba(241,236,220,0.78); }
.state-card.after{ background: var(--ink); color: var(--paper); border-color: var(--ink); }
.state-card.after .eyebrow{ color: var(--brass); }
.state-card.after .eyebrow::before{ background: var(--brass); }
.state-card.after p{ color: rgba(241,236,220,0.85); }

/* Single-column hero variant */
.hero-inner.one-col{ grid-template-columns: 1fr; max-width: 760px; }
.hero-sub{
  font-family: var(--font);
  font-style: italic;
  font-weight: 600;
  font-size: var(--fs-base);
  color: var(--brass);
  margin-top: 18px;
  line-height: 1.4;
}

/* ---------------- LAYERED ARCHITECTURE CHAIN (Operating System page) ---------------- */
.chain{ display:flex; flex-direction:column; align-items:center; }
.chain-box{
  border: 1px solid var(--brass);
  padding: 14px 30px;
  font-family: var(--font);
  font-size: var(--fs-sm);
  font-weight:600;
  letter-spacing: .06em;
  text-transform: uppercase;
  text-align:center;
  background: var(--paper);
  color: var(--ink);
}
.chain-box.top{
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
  font-family: var(--font);
  font-style: italic;
  text-transform: none;
  font-size: var(--fs-base);
  padding: 20px 36px;
  letter-spacing: 0;
}
.chain-arrow{ color: var(--brass); font-size: var(--fs-base); line-height:1; padding: 8px 0; }

/* ---------------- DETAILED STEP CARDS (S.T.E.P.S.™) ---------------- */
.step-detail{ padding: 32px 0; border-top: 1px solid var(--line); }
.step-detail:last-child{ border-bottom: 1px solid var(--line); }
.step-detail-head{ display:flex; align-items:flex-end; gap: 20px; margin-bottom: 18px; }
.step-detail .letter{ font-family: var(--font); font-style: italic; font-weight:600; font-size: var(--fs-lg); color: var(--brass); line-height: 0.9; }
.step-detail h3{ font-size: var(--fs-lg); }
.step-detail .step-purpose{ font-size: var(--fs-base); color: rgba(22,33,58,0.72); max-width: 60ch; margin-bottom: 26px; }
.step-detail-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
.step-detail-grid h4{
  font-family: var(--font); font-size: var(--fs-sm); font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--brass); margin-bottom: 12px;
}
.step-detail-grid ul{ display:flex; flex-direction:column; gap: 8px; }
.step-detail-grid li{ font-size: var(--fs-sm); color: rgba(22,33,58,0.72); line-height:1.5; padding-left:14px; position:relative; }
.step-detail-grid li::before{ content:'—'; position:absolute; left:0; color: var(--brass); }

@media (max-width: 720px){
  .step-detail-grid{ grid-template-columns: 1fr; gap:18px; }
}

/* ---------------- CHIP ROWS (topics, workshop themes) ---------------- */
.chip-row{ display:flex; flex-wrap:wrap; gap:8px; margin-top:16px; }
.chip{
  font-family: var(--font); font-size: var(--fs-sm); letter-spacing:.02em;
  border: 1px solid var(--line); padding: 7px 13px; color: rgba(22,33,58,0.72);
}
.bg-ink .chip{ border-color: var(--paper-line); color: rgba(241,236,220,0.8); }
.bg-dim .chip{ background: var(--paper); }

.solution-body h4{
  font-family: var(--font); font-weight: 600; font-size: var(--fs-base);
  margin: 30px 0 10px; color: var(--ink);
}
.bg-ink .solution-body h4{ color: var(--paper); }
.solution-body .lede{ font-family: var(--font); font-style: italic; font-weight:600; font-size: var(--fs-base); color: var(--brass); margin-bottom: 14px; }
.bg-ink .solution-body .lede{ color: var(--brass); }
.bg-ink .solution-meta p{ color: rgba(241,236,220,0.72); }
.bg-ink .solution-body p{ color: rgba(241,236,220,0.72); }
.bg-ink .solution-row{ border-top-color: var(--paper-line); }

/* Belt-and-suspenders overrides: any component that can end up inside
   a bg-ink section (via the alternating section rhythm) must keep
   legible light text and visible borders, regardless of which page
   or order it appears in. */
.bg-ink .step p{ color: rgba(241,236,220,0.72); }
.bg-ink .step{ border-top-color: var(--paper-line); }
.bg-ink .step:last-child{ border-bottom-color: var(--paper-line); }
.bg-ink .step-detail{ border-top-color: var(--paper-line); }
.bg-ink .step-detail:last-child{ border-bottom-color: var(--paper-line); }
.bg-ink .step-detail .step-purpose{ color: rgba(241,236,220,0.72); }
.bg-ink .step-detail-grid li{ color: rgba(241,236,220,0.72); }
.bg-ink .hierarchy-top p{ color: rgba(22,33,58,0.72); }
.bg-ink .branch p{ color: rgba(22,33,58,0.72); }
.bg-ink .insight-card{ border-color: var(--paper-line); }
.bg-ink .insight-card p{ color: rgba(241,236,220,0.72); }
.bg-ink .filter-btn{ border-color: var(--paper-line); color: rgba(241,236,220,0.72); }
.bg-ink .tl-row{ border-top-color: var(--paper-line); }
.bg-ink .tl-row p{ color: rgba(241,236,220,0.72); }
.bg-ink .option-card{ border-color: var(--paper-line); }
.bg-ink .option-card p{ color: rgba(241,236,220,0.72); }
.bg-ink .invitation-list li{ color: rgba(241,236,220,0.72); }
.bg-ink .form-note{ color: rgba(241,236,220,0.55); }
.bg-ink .field label{ color: rgba(241,236,220,0.7); }
.bg-ink .stat{ border-top-color: var(--paper-line); }
.bg-ink .stat .l{ color: rgba(241,236,220,0.7); }

/* Journey steps use numerals instead of letters, same visual language as S.T.E.P.S. */
.step .letter.num{ font-style: normal; }

/* ---------------- ARTICLE TEMPLATE (Insights pieces) ---------------- */
.back-link{
  font-family: var(--font); font-size: var(--fs-sm); font-weight:600; text-transform: uppercase;
  letter-spacing: .08em; color: var(--brass); display:inline-flex;
  gap:8px; align-items:center;
}
.back-link:hover{ color: var(--paper); }
.article-hero{ background: var(--ink); color: var(--paper); padding: 56px 0 46px; }
.article-hero .wrap{ max-width: 740px; }
.article-hero h1{ color: var(--paper); font-size: var(--fs-lg); margin-top:16px; }
.article-dek{ font-family: var(--font); font-style: italic; font-weight:600; font-size: var(--fs-base); color: var(--brass); margin-top:16px; line-height:1.5; max-width: 56ch; }
.article-meta{
  display:flex; flex-wrap:wrap; gap:14px; align-items:center;
  font-family: var(--font); font-size: var(--fs-sm); letter-spacing:.05em;
  text-transform: uppercase; color: rgba(241,236,220,0.6); margin-top:24px;
}
.article-meta span{ position:relative; }
.article-meta span:not(:last-child)::after{ content:'·'; margin-left:14px; color:var(--brass); }

.article-body{ max-width: 680px; margin: 0 auto; }
.article-body > .wrap{ max-width: 680px; }
.article-body p{ font-size:var(--fs-base); line-height:1.75; color: rgba(22,33,58,0.72); margin:0 0 20px; }
.article-body h2{ font-size: var(--fs-lg); margin: 44px 0 16px; color: var(--ink); }
.article-body .pull-quote{ margin: 36px 0; }
.article-body .beat-line{ margin: 30px 0; }
.article-cta{ background: var(--paper); border: 1px solid var(--line); padding: 32px 30px; margin-top: 50px; }
.article-cta p{ margin-bottom: 18px; color: rgba(22,33,58,0.72); }

/* ---------------- MANIFESTO PAGE ---------------- */
.manifesto-hero{
  background: var(--ink); color: var(--paper);
  padding: 56px 0 48px; text-align:center;
}
.manifesto-hero .wrap{ max-width: 780px; }
.manifesto-hero .eyebrow{ justify-content:center; }
.manifesto-hero h1{ font-size: var(--fs-lg); color: var(--paper); margin-top:20px; }
.manifesto-hero .dek{ font-family: var(--font); font-style: italic; font-weight:600; font-size: var(--fs-base); color: var(--brass); margin-top: 22px; line-height:1.4; }

.chapter{ max-width: 680px; margin: 0 auto; padding: 40px 0; }
.chapter .eyebrow{ margin-bottom: 16px; }
.chapter h2{ font-size: var(--fs-lg); margin-bottom: 22px; }
.chapter p{ font-size: var(--fs-base); line-height: 1.75; color: rgba(22,33,58,0.72); margin: 0 0 18px; }
.bg-ink .chapter p{ color: rgba(241,236,220,0.8); }
.chapter-divider{ height:1px; background:var(--line); max-width:680px; margin:0 auto; }
.bg-ink .chapter-divider{ background: var(--paper-line); }

.belief-list{ display:flex; flex-direction:column; gap: 16px; max-width: 680px; margin: 0 auto; }
.belief-list li{
  display:flex; gap:16px; font-family: var(--font); font-style: italic; font-weight:600;
  font-size: var(--fs-base); line-height:1.5; color: var(--paper);
}
.belief-list li .mark{ color: var(--brass); flex-shrink:0; }

.invitation-list{ display:flex; flex-direction:column; gap:14px; max-width:640px; margin:28px auto 0; }
.invitation-list li{ font-size:var(--fs-base); color: rgba(22,33,58,0.72); padding-left:20px; position:relative; }
.invitation-list li::before{ content:'—'; position:absolute; left:0; color:var(--brass); }

/* ---------------- RESPONSIVE ---------------- */
@media (max-width: 920px){
  .hero-inner{ grid-template-columns:1fr; }
  .hero-side{ border-left:none; border-top:1px solid var(--paper-line); padding-left:0; padding-top:24px; }
  .grid-3, .grid-2{ grid-template-columns:1fr; }
  .split{ grid-template-columns:1fr; gap:36px; }
  .hierarchy-branches{ grid-template-columns: repeat(2,1fr); }
  .solution-row{ grid-template-columns:1fr; gap:20px; }
  .insight-grid{ grid-template-columns: repeat(2,1fr); }
  .book-grid{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
  .stat-strip{ grid-template-columns:1fr; }
  .email-modal{ padding:26px 22px 24px; }
}
@media (max-width: 720px){
  .subnav-links{
    position:fixed; inset: 108px 0 0 0; background: var(--paper);
    flex-direction:column; align-items:flex-start; padding: 30px var(--gutter);
    gap: 4px; transform: translateX(100%); transition: transform .3s ease;
    border-top: 1px solid var(--line);
    overflow-y:auto;
  }
  .subnav{ border-top:none; }
  .subnav-links.open{ transform: translateX(0); }
  .subnav-links > li{ width:100%; }
  .subnav-links > li > a{ padding: 14px 0; }
  .nav-toggle{ display:flex; }
  .nav-cta .btn-line{ display:none; }
  .dropdown{
    position:static; display:flex; flex-direction:column;
    border:none; box-shadow:none; padding: 0 0 8px 14px; min-width:0;
  }
  .insight-grid{ grid-template-columns:1fr; }
  .step{ grid-template-columns: 50px 1fr; gap:16px; }
  .step .letter{ font-size:32px; }
}