/* ═══════════════════════════════════════════════════════
   EMERGING PATTERNS 2.0 — DESIGN SYSTEM
   Ivory paper, quiet rules, type-led hierarchy.
   Editorial report — less box, more breath.
═══════════════════════════════════════════════════════ */

:root {
  --font-display: "Newsreader", Georgia, serif;
  --font-body:    "IBM Plex Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "Courier New", monospace;

  --paper:   #FBFAF7;
  --paper-2: #F4F2EC;
  --ink:     #16150F;
  --ink-70:  rgba(22, 21, 15, 0.70);
  --ink-45:  rgba(22, 21, 15, 0.45);
  --ink-20:  rgba(22, 21, 15, 0.20);
  --ink-12:  rgba(22, 21, 15, 0.12);
  --ink-06:  rgba(22, 21, 15, 0.06);
  /* WashU crimson */
  --accent:      #A51417;
  --accent-soft: rgba(165, 20, 23, 0.07);
  --on-accent:   #FFFFFF;

  --sidebar-w: 288px;
  --content-max: 1080px;
  --measure: 62ch;
  --chapter-pad-y: clamp(64px, 9vh, 112px);

  --text-sm:   0.75rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.375rem;
  --text-2xl:  clamp(2.25rem, 4vw, 3.25rem);
  --text-hero: clamp(2.5rem, 5.2vw, 4.25rem);
  --leading: 1.58;

  --ease-snap: cubic-bezier(0.2, 0.9, 0.25, 1);
}

[data-theme="dark"] {
  --paper:   #17150F;
  --paper-2: #1E1B14;
  --ink:     #F0EDE4;
  --ink-70:  rgba(240, 237, 228, 0.72);
  --ink-45:  rgba(240, 237, 228, 0.48);
  --ink-20:  rgba(240, 237, 228, 0.22);
  --ink-12:  rgba(240, 237, 228, 0.14);
  --ink-06:  rgba(240, 237, 228, 0.07);
  --accent:  #D25353;
  --accent-soft: rgba(210, 83, 83, 0.14);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: light;
  overflow-x: clip;
  overscroll-behavior-x: none;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
html[data-theme="dark"] { color-scheme: dark; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: var(--leading);
  color: var(--ink);
  background: var(--paper);
  max-width: 100%;
  overflow-x: hidden;
  touch-action: pan-y;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-kerning: normal;
  font-variant-ligatures: common-ligatures;
  transition: background 0.25s ease, color 0.25s ease;
}

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

em { font-style: italic; }
strong { font-weight: 600; }

/* ═══ Reading progress ═══ */
.progress-track {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: transparent;
  z-index: 60;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
}

/* ═══ Sidebar ═══ */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  gap: 36px;
  padding: 40px 26px 28px;
  background: var(--paper);
  border-right: 1px solid var(--ink-12);
  overflow-y: auto;
  z-index: 50;
}

.sidebar-brand {
  display: block;
  text-decoration: none;
  color: var(--ink);
}
.sidebar-brand-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-45);
  margin-bottom: 10px;
}
.sidebar-brand-title {
  display: block;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.75rem;
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-optical-sizing: auto;
}
.sidebar-brand-title em { color: var(--accent); }
.sidebar-brand-edition {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.chapter-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}
.chapter-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 0;
  text-decoration: none;
  color: var(--ink-70);
  font-size: 0.9375rem;
  line-height: 1.35;
  border-left: 2px solid transparent;
  padding-left: 10px;
  margin-left: -12px;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.chapter-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-45);
  flex: none;
}
.chapter-link:hover { color: var(--ink); }
.chapter-link.is-active {
  color: var(--ink);
  border-left-color: var(--accent);
}
.chapter-link.is-active .chapter-num { color: var(--accent); font-weight: 600; }

.sidebar-footer { border-top: 1px solid var(--ink-12); padding-top: 20px; }

/* ═══ Buttons ═══ */
.btn, .theme-btn, .nav-toggle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink-20);
  padding: 11px 18px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover, .theme-btn:hover, .nav-toggle:hover {
  border-color: var(--ink);
  background: var(--ink-06);
}
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}
.btn-primary:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}
.btn-ghost {
  background: transparent;
  border-color: transparent;
  padding-left: 0;
  padding-right: 0;
}
.btn-ghost:hover { background: transparent; border-color: transparent; color: var(--accent); }

.theme-btn {
  width: 100%;
  justify-content: flex-start;
  border: none;
  padding: 8px 0;
  color: var(--ink-70);
  background: transparent;
}
.theme-btn:hover {
  color: var(--ink);
  background: transparent;
  border-color: transparent;
}
.theme-btn-icon {
  width: 12px; height: 12px;
  border: 1px solid currentColor;
  border-radius: 50%;
  background: linear-gradient(90deg, currentColor 50%, transparent 50%);
}

/* ═══ Mobile nav toggle ═══ */
.nav-toggle {
  display: none;
  position: fixed;
  top: 16px; right: 16px;
  z-index: 70;
  padding: 10px 14px;
}
.nav-scrim {
  position: fixed;
  inset: 0;
  background: rgba(22, 21, 15, 0.5);
  z-index: 45;
}

/* ═══ Main / chapters ═══ */
.main { margin-left: var(--sidebar-w); }

.chapter {
  border-bottom: 1px solid var(--ink-12);
  padding: var(--chapter-pad-y) clamp(28px, 5vw, 72px);
}
.chapter.alt { background: var(--paper-2); }
.chapter-inner { max-width: var(--content-max); min-width: 0; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: 12px;
}

.chapter-header {
  display: grid;
  grid-template-columns: max-content minmax(0, var(--measure));
  justify-content: start;
  column-gap: 28px;
  align-items: start;
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--ink-12);
}
.chapter-index {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(3.25rem, 7vw, 5rem);
  line-height: 0.88;
  letter-spacing: -0.045em;
  color: var(--accent);
  font-optical-sizing: auto;
  padding-top: 2px;
}
.chapter-header .eyebrow { margin-bottom: 8px; }
.chapter-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-2xl);
  line-height: 1.16;
  letter-spacing: -0.022em;
  max-width: 16em;
  font-optical-sizing: auto;
}
.chapter-title em { color: var(--accent); font-style: italic; }
.chapter-note {
  margin-top: 16px;
  font-size: var(--text-sm);
  font-style: italic;
  color: var(--ink-45);
  max-width: 48ch;
  line-height: 1.5;
}

/* ═══ Hero ═══ */
.hero { min-height: 0; display: block; }
.hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-hero);
  line-height: 1.12;
  letter-spacing: -0.028em;
  margin-bottom: 16px;
  max-width: 11em;
  font-optical-sizing: auto;
}
.hero-title em { color: var(--accent); font-style: italic; }
.hero-meta {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-45);
  max-width: var(--measure);
  margin-bottom: 36px;
  line-height: 1.5;
}
.hero-lede { max-width: var(--measure); display: grid; gap: 16px; margin-bottom: 44px; }
.hero-lede p:first-child { font-size: var(--text-lg); line-height: 1.55; }
.hero-lede p + p { color: var(--ink-70); }

/* ═══ Essays ═══ */
.essay {
  max-width: var(--measure);
  display: grid;
  gap: 1.05em;
  margin-bottom: 28px;
}
.essay p { color: var(--ink-70); }
.essay strong { color: var(--ink); font-weight: 600; }
.essay em { color: var(--ink); }
.essay a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
}
.essay a:hover { color: var(--accent); }
.essay .lead {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: 1.3125rem;
  line-height: 1.38;
  color: var(--ink);
  letter-spacing: -0.016em;
  font-optical-sizing: auto;
  margin-bottom: 0.55em;
  padding-bottom: 0.85em;
  border-bottom: 1px solid var(--ink-12);
}
.bridge {
  max-width: var(--measure);
  font-size: 0.9375rem;
  font-style: italic;
  color: var(--ink-45);
  line-height: 1.5;
  margin: 28px 0 10px;
}
.bridge + .pull-quote,
.bridge + .quote-grid { margin-top: 10px; }
.essay-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  max-width: var(--measure);
  margin-bottom: 40px;
}

.signoff {
  display: grid;
  gap: 6px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--ink-12);
  max-width: 36ch;
}
.signoff-name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--ink);
}
.signoff-role {
  font-size: var(--text-sm);
  line-height: 1.45;
  color: var(--ink-45);
}

.quality {
  max-width: var(--measure);
  display: grid;
  gap: 14px;
  margin: 64px 0 16px;
  padding-top: 32px;
  border-top: 1px solid var(--ink-12);
}
.essay + .quality { margin-top: 56px; }
.quality + .pull-quote { margin-top: 20px; }
.quality-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-xl);
  line-height: 1.22;
  letter-spacing: -0.015em;
  font-optical-sizing: auto;
  color: var(--ink);
}
.quality p { line-height: var(--leading); color: var(--ink-70); }
.quality p strong { color: var(--ink); }
.quality-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  font-style: normal;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 8px;
}

.essay-close {
  max-width: var(--measure);
  display: grid;
  gap: 1.05em;
  margin-top: 64px;
  padding-top: 36px;
  border-top: 1px solid var(--ink-12);
}
.essay-close p { color: var(--ink-70); }
.essay-close p:first-child {
  font-family: var(--font-display);
  font-style: normal;
  font-size: 1.1875rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--ink);
  letter-spacing: -0.012em;
}

.cohort-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 6px 24px;
  margin-top: 8px;
  max-width: var(--measure);
  color: var(--ink-70);
}
.cohort-list li { line-height: 1.5; }
.cohort-list a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
}
.cohort-list a:hover { color: var(--accent); }

.essay.letter {
  margin-bottom: 40px;
}
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 32px 48px;
  margin: 0 0 40px;
  padding: 28px 0;
  border-top: 1px solid var(--ink-12);
  border-bottom: 1px solid var(--ink-12);
  max-width: var(--measure);
}
.stat-block {
  padding: 0;
  min-width: 120px;
}
.stat-block + .stat-block {
  padding-left: 0;
  border-left: none;
}

/* ═══ Stats ═══ */
.stat-val {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.25rem, 4.5vw, 3.25rem);
  line-height: 1;
  font-variant-numeric: lining-nums tabular-nums;
  letter-spacing: -0.02em;
  font-optical-sizing: auto;
}
.stat-denom {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--ink-45);
  margin-left: 2px;
}
.stat-label {
  display: block;
  margin-top: 10px;
  font-size: var(--text-sm);
  line-height: 1.45;
  color: var(--ink-70);
  max-width: 34ch;
}
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 28px 40px;
  margin: 36px 0;
  padding: 28px 0;
  border-top: 1px solid var(--ink-12);
  border-bottom: 1px solid var(--ink-12);
  max-width: var(--measure);
}
.stat-card {
  padding: 0;
  border: none;
  background: transparent;
}
.stat-card .stat-val { color: var(--accent); }

/* ═══ Content blocks ═══ */
.block-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-45);
  margin-bottom: 12px;
}
.hero .block-label {
  margin-bottom: 0;
  padding-top: 4px;
}
.evidence { max-width: var(--measure); display: grid; gap: 16px; margin-bottom: 48px; }

.why-matters {
  border: none;
  border-top: 1px solid var(--ink-12);
  background: transparent;
  padding: 28px 0 0;
  margin-top: 48px;
  max-width: var(--measure);
}
.why-matters .block-label { color: var(--accent); margin-bottom: 0; }

/* ═══ Quotes ═══ */
.pull-quote {
  position: relative;
  border: none;
  background: transparent;
  box-shadow: none;
  padding: 4px 0 4px 22px;
  margin: 32px 0;
  border-left: 2px solid var(--accent);
  max-width: var(--measure);
}
.pull-quote::before { content: none; }
.pull-quote p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.42;
  letter-spacing: -0.008em;
  color: var(--ink);
  font-optical-sizing: auto;
}
.pull-quote cite {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-45);
}
.pull-quote cite::before { content: "— "; color: var(--accent); }

.quote-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr));
  gap: 28px 36px;
  margin: 32px 0;
  max-width: calc(var(--measure) + 8ch);
}
.quote-grid .pull-quote { margin: 0; }
.quote-grid .pull-quote p { font-size: 1.0625rem; }

.inline-quote {
  border-left: 2px solid var(--accent);
  padding: 2px 0 2px 18px;
  font-style: italic;
  color: var(--ink-70);
}

.is-placeholder { opacity: 0.55; }
.is-placeholder::after {
  content: "DRAFT";
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  color: var(--ink-45);
  margin-top: 12px;
}

/* ═══ Figures & charts ═══ */
.figure { margin: 56px 0; max-width: 100%; overflow-x: hidden; }
.figure-caption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-70);
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink-12);
  line-height: 1.5;
}
.figure-kicker {
  display: inline-block;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-right: 10px;
}
.figure-hint { display: block; margin-top: 6px; color: var(--ink-45); }

.chart-placeholder {
  border: none;
  border-top: 1px dashed var(--ink-20);
  border-bottom: 1px dashed var(--ink-20);
  background: transparent;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 48px 32px;
  text-align: center;
}
.chart-placeholder-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-45);
}
.chart-placeholder-desc { font-size: var(--text-sm); color: var(--ink-45); max-width: 42ch; }

/* Sankey */
#figure-pathways { margin-left: calc(-1 * clamp(0px, 2vw, 40px)); margin-right: calc(-1 * clamp(0px, 2vw, 40px)); }
.sankey-wrap {
  position: relative;
  border: none;
  background: transparent;
  box-shadow: none;
  padding: 8px 0 48px;
  max-width: 100%;
  overflow: hidden;
}
#sankey-chart { width: 100%; max-width: 100%; height: auto; display: block; }
.sankey-status {
  position: absolute;
  left: 50%; bottom: 8px;
  transform: translateX(-50%);
  display: flex;
  gap: 18px;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-70);
  white-space: nowrap;
  pointer-events: none;
}
.sankey-active { color: var(--ink-45); }

.chart-tooltip {
  position: absolute;
  pointer-events: none;
  opacity: 0;
  background: var(--paper);
  border: 1px solid var(--ink-12);
  padding: 12px 16px;
  font-size: var(--text-sm);
  line-height: 1.5;
  max-width: 280px;
  z-index: 10;
  transition: opacity 0.1s;
}
.chart-tooltip .tip-muted { color: var(--ink-45); font-size: 0.75rem; }

/* Horizontal bars (activities chart) */
.bars-chart { display: grid; gap: 18px; padding: 8px 0; }
.bar-row { display: grid; grid-template-columns: 190px 1fr; gap: 16px; align-items: center; }
.bar-name {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-align: right;
  color: var(--ink-70);
}
.bar-track {
  position: relative;
  height: 28px;
  border: none;
  background: var(--ink-06);
}
.bar-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: var(--accent);
  transition: width 0.9s var(--ease-snap);
}
.bar-row:nth-child(even) .bar-fill { background: var(--ink); }
.bar-val {
  position: absolute;
  right: 10px; top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--ink);
}

/* ═══ Footer ═══ */
.report-footer {
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--ink-12);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-45);
}
.footer-meta {
  display: grid;
  gap: 8px;
}
.footer-copyright {
  max-width: 46ch;
  text-transform: none;
  letter-spacing: 0.02em;
  line-height: 1.45;
}
.methods-note { font-family: var(--font-mono); font-size: 0.75rem; color: var(--ink-45); }

/* ═══ Reveal animation ═══ */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s var(--ease-snap);
}
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .bar-fill { transition: none; }
}

/* ═══ Responsive ═══ */
@media (max-width: 960px) {
  :root { --sidebar-w: 0px; }
  .main { margin-left: 0; }

  .nav-toggle { display: inline-flex; }

  .sidebar {
    width: min(320px, 86vw);
    transform: translateX(-105%);
    transition: transform 0.25s var(--ease-snap);
    box-shadow: none;
  }
  .sidebar.is-open {
    transform: translateX(0);
    box-shadow: 12px 0 40px rgba(22, 21, 15, 0.12);
  }

  .hero { min-height: 0; }
  .chapter { padding-left: 20px; padding-right: 20px; }
  .quote-grid { grid-template-columns: 1fr; }
  .bar-row { grid-template-columns: 120px 1fr; }
  .bar-name { font-size: 0.6875rem; }
  .pull-quote { padding: 4px 0 4px 20px; }
  .chapter-header { grid-template-columns: 1fr; gap: 4px; }
  .chapter-index { font-size: 2.75rem; }
  .hero-stats { flex-direction: column; }
  .stat-block { padding: 18px 0; }
  .stat-block + .stat-block {
    padding-left: 0;
    border-left: none;
    border-top: 1px solid var(--ink-12);
  }
  .sankey-status { flex-direction: column; gap: 2px; align-items: center; white-space: normal; text-align: center; width: 92%; }
  #figure-pathways { margin-left: 0; margin-right: 0; }
  .stat-row { grid-template-columns: 1fr; }
}