/* ==========================================================================
   UNF█CK — The Forensic Architect
   Design System: blueprint precision, editorial typography, monospace data
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  --primary: #000000;
  --on-primary: #e2e2e2;
  --surface: #f9f9f9;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f3f3f3;
  --surface-container: #eeeeee;
  --surface-container-high: #e8e8e8;
  --surface-container-highest: #e2e2e2;
  --on-surface: #1a1c1c;
  --on-surface-variant: #474747;
  --outline: #777777;
  --outline-variant: #c6c6c6;
  --tertiary: #3b3b3b;
  --tertiary-fixed-dim: #474747;
  --error: #ba1a1a;

  --font-headline: 'Epilogue', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Epilogue', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Space Grotesk', 'SF Mono', Menlo, monospace;

  --max-width: 1440px;
  --header-height: 73px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 16px); }
body {
  margin: 0;
  background: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  position: relative;
}
img, svg { display: block; max-width: 100%; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4, h5 { margin: 0; font-family: var(--font-headline); }
p { margin: 0; }

/* ---------- Blueprint background ---------- */
.blueprint-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--outline-variant) 1px, transparent 1px),
    linear-gradient(to bottom, var(--outline-variant) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.1;
}

/* ---------- Layout ---------- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.main { max-width: var(--max-width); margin: 0 auto; padding: 48px 24px; display: flex; flex-direction: column; gap: 112px; }
@media (min-width: 768px) { .main { padding: 80px 24px; } }

/* ---------- Typography utilities ---------- */
.font-mono { font-family: var(--font-mono); }
.font-headline { font-family: var(--font-headline); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
}

.text-redacted {
  display: inline-block;
  background: var(--primary);
  color: transparent;
  user-select: none;
  line-height: 1;
  padding: 0 6px;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface-container-lowest);
  border-bottom: 2px solid var(--primary);
}
.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}
.site-header__brand {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 24px;
  letter-spacing: -0.04em;
  color: var(--primary);
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  justify-content: center;
}
@media (max-width: 900px) {
  .site-header__inner { flex-wrap: wrap; gap: 12px; }
  .site-nav { width: 100%; order: 3; border-top: 1px solid var(--outline-variant); padding-top: 12px; }
}
.site-nav a {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  padding: 6px 10px;
  transition: background 0.1s, color 0.1s;
}
.site-nav a:hover, .site-nav a.is-active {
  background: var(--primary);
  color: var(--on-primary);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 14px 28px;
  border: 2px solid var(--primary);
  transition: background 0.15s, color 0.15s;
  cursor: pointer;
}
.btn--primary {
  background: var(--primary);
  color: var(--on-primary);
  border-radius: 4px;
}
.btn--primary:hover { background: var(--tertiary-fixed-dim); }
.btn--secondary {
  background: transparent;
  color: var(--primary);
  border-radius: 0;
}
.btn--secondary:hover {
  background: var(--primary);
  color: var(--on-primary);
}
.btn--invert {
  background: var(--on-primary);
  color: var(--primary);
  border-color: var(--on-primary);
  border-radius: 4px;
}
.btn--invert:hover { background: var(--surface-container-highest); }
.btn--invert-secondary {
  background: transparent;
  color: var(--on-primary);
  border-color: var(--on-primary);
}
.btn--invert-secondary:hover { background: var(--on-primary); color: var(--primary); }
.btn--sm { padding: 8px 16px; font-size: 11px; }

/* ---------- Section heading ---------- */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 2px solid var(--primary);
  padding-bottom: 16px;
}
.section-head__title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: clamp(28px, 4vw, 48px);
  letter-spacing: -0.02em;
  text-transform: uppercase;
  line-height: 1;
}
.section-head__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
  white-space: nowrap;
}

section { display: flex; flex-direction: column; gap: 40px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
  padding: 48px 32px;
}
@media (min-width: 768px) { .hero { padding: 64px; } }

.hero__chip {
  position: absolute;
  top: 0;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.hero__chip--left { left: 0; background: var(--primary); color: var(--on-primary); }
.hero__chip--right { right: 0; border-left: 2px solid var(--primary); border-bottom: 2px solid var(--primary); background: var(--surface-container-lowest); color: var(--primary); }

.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
  margin-top: 24px;
}
@media (min-width: 1024px) { .hero__grid { grid-template-columns: 2fr 1fr; } }

.hero__title {
  font-weight: 900;
  font-size: clamp(44px, 8vw, 112px);
  line-height: 0.95;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  margin-bottom: 28px;
}
.hero__sub {
  font-size: clamp(17px, 1.4vw, 21px);
  color: var(--on-surface-variant);
  max-width: 640px;
  line-height: 1.5;
  margin-bottom: 32px;
}
.hero__ctas { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 16px; }
.hero__micro {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--outline);
}

/* Schematic placeholder block */
.schematic {
  display: none;
  aspect-ratio: 1 / 1;
  border: 2px solid var(--primary);
  background: var(--surface);
  position: relative;
  overflow: hidden;
}
@media (min-width: 1024px) { .schematic { display: block; } }
.schematic::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--outline-variant) 1px, transparent 1px),
    linear-gradient(to bottom, var(--outline-variant) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.4;
}
.schematic__inner {
  position: relative;
  z-index: 1;
  padding: 20px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
}
.schematic__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
}
.schematic__diagram {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-rows: auto auto auto;
  gap: 12px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.schematic__node {
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
  padding: 10px 6px;
  text-align: center;
}
.schematic__node--filled { background: var(--primary); color: var(--on-primary); }
.schematic__arrow { text-align: center; font-family: var(--font-mono); }
.schematic__leak {
  grid-column: 1 / 4;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--error);
  letter-spacing: 0.1em;
}

/* ---------- Problem section ---------- */
.problem-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  max-width: 1100px;
}
@media (min-width: 768px) { .problem-grid { grid-template-columns: repeat(3, 1fr); } }
.problem-grid p { font-size: 17px; line-height: 1.6; color: var(--on-surface); }

/* ---------- Fit Check (For / Not For) ---------- */
.fit-grid {
  display: grid;
  grid-template-columns: 1fr;
  border: 2px solid var(--primary);
}
@media (min-width: 768px) { .fit-grid { grid-template-columns: 1fr 1fr; } }

.fit-cell { padding: 32px; }
@media (min-width: 768px) { .fit-cell { padding: 40px; } }
.fit-cell--for { background: var(--surface-container-lowest); border-bottom: 2px solid var(--primary); }
.fit-cell--not { background: var(--surface-container-low); }
@media (min-width: 768px) {
  .fit-cell--for { border-bottom: none; border-right: 2px solid var(--primary); }
}
.fit-cell__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.fit-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px 0;
  font-size: 16px;
  line-height: 1.5;
}
.fit-list li .marker {
  font-family: var(--font-mono);
  margin-top: 2px;
  color: var(--primary);
}
.fit-cell--not .fit-list li { color: var(--on-surface-variant); }
.fit-cell--not .fit-list li .marker { color: var(--on-surface-variant); }

/* ---------- Coverage grid (8 tiles) ---------- */
.coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 640px) { .coverage-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .coverage-grid { grid-template-columns: repeat(4, 1fr); } }

.coverage-tile {
  border: 1px solid var(--outline-variant);
  background: var(--surface-container-lowest);
  padding: 24px;
  transition: border-color 0.15s;
}
.coverage-tile:hover { border-color: var(--primary); }
.coverage-tile--feature {
  background: var(--primary);
  color: var(--on-primary);
  border: 2px solid var(--primary);
}
.coverage-tile__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--outline);
  margin-bottom: 12px;
}
.coverage-tile--feature .coverage-tile__num { color: var(--on-primary); opacity: 0.7; }
.coverage-tile__title {
  font-family: var(--font-headline);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 17px;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.coverage-tile__desc { font-size: 14px; color: var(--on-surface-variant); line-height: 1.5; }
.coverage-tile--feature .coverage-tile__desc { color: var(--on-primary); opacity: 0.9; }

/* ---------- Diagnostic block ---------- */
.diagnostic {
  position: relative;
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
  padding: 32px;
}
@media (min-width: 768px) { .diagnostic { padding: 48px; } }

.diagnostic__chip {
  position: absolute;
  top: 0;
  right: 0;
  padding: 6px 10px;
  background: var(--primary);
  color: var(--on-primary);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.diagnostic__head { margin-bottom: 40px; display: flex; flex-direction: column; gap: 12px; }
.diagnostic__title {
  font-weight: 700;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}
.diagnostic__sub {
  font-size: 17px;
  color: var(--on-surface-variant);
  max-width: 720px;
  line-height: 1.5;
  margin-top: 8px;
}

.deliverables {
  display: grid;
  grid-template-columns: 1fr;
  border: 2px solid var(--primary);
}
@media (min-width: 768px) { .deliverables { grid-template-columns: repeat(3, 1fr); } }
.deliverable {
  padding: 28px;
  border-bottom: 2px solid var(--primary);
}
.deliverable:last-child { border-bottom: none; }
@media (min-width: 768px) {
  .deliverable { border-bottom: none; border-right: 2px solid var(--primary); }
  .deliverable:last-child { border-right: none; }
  .deliverable--alt { background: var(--surface-container-low); }
}
.deliverable__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
  margin-bottom: 16px;
}
.deliverable__title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}
.deliverable__desc { font-size: 14px; color: var(--on-surface-variant); line-height: 1.6; }
.deliverable__list { font-size: 14px; color: var(--on-surface-variant); display: flex; flex-direction: column; gap: 8px; }
.deliverable__list strong { color: var(--on-surface); }

.diagnostic__footer {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--outline-variant);
  display: flex;
  flex-direction: column;
  gap: 24px;
  justify-content: space-between;
  align-items: flex-start;
}
@media (min-width: 768px) { .diagnostic__footer { flex-direction: row; align-items: center; } }
.diagnostic__price {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--outline);
}

/* ---------- Process (week-by-week) ---------- */
.process-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 1024px) { .process-grid { grid-template-columns: repeat(2, 1fr); } }
.week {
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
}
.week__header {
  border-bottom: 2px solid var(--primary);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.week__title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 24px;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}
.week__range {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
}
.week__list li {
  padding: 20px 24px;
  border-bottom: 1px solid var(--outline-variant);
}
.week__list li:last-child { border-bottom: none; }
.week__list li.week__totals { background: var(--primary); color: var(--on-primary); }
.day-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
  margin-bottom: 4px;
}
.week__totals .day-tag { color: var(--on-primary); opacity: 0.7; }
.day-title {
  font-family: var(--font-headline);
  font-weight: 700;
  margin-bottom: 4px;
}
.day-desc { font-size: 14px; color: var(--on-surface-variant); }
.week__totals .day-desc { color: var(--on-primary); opacity: 0.9; }

/* ---------- Proof (case study cards) ---------- */
.proof-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 1024px) { .proof-grid { grid-template-columns: repeat(2, 1fr); } }
.case-card {
  display: block;
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
  padding: 32px;
  transition: background 0.15s;
}
a.case-card:hover { background: var(--surface-container-low); }
.case-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}
.case-card__metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
.metric {
  border: 1px solid var(--primary);
  padding: 16px;
}
.metric--filled { background: var(--primary); color: var(--on-primary); }
.metric__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
}
.metric--filled .metric__label { color: var(--on-primary); opacity: 0.7; }
.metric__value {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  margin-top: 4px;
}
.case-card__body { font-size: 16px; line-height: 1.6; color: var(--on-surface); }
.case-card__cta {
  margin-top: 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.stack-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 24px; }
.stack-chip {
  border: 1px solid var(--outline-variant);
  padding: 12px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.stack-chip--picked { border: 2px solid var(--primary); background: var(--primary); color: var(--on-primary); }

/* ---------- FAQ list ---------- */
.faq-block {
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
}
.faq-row {
  display: flex;
  flex-direction: column;
  border-bottom: 2px solid var(--primary);
}
.faq-row:last-child { border-bottom: none; }
@media (min-width: 768px) { .faq-row { flex-direction: row; } }
.faq-row__num {
  padding: 24px;
  background: var(--surface-container-low);
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
}
@media (min-width: 768px) {
  .faq-row__num { width: 128px; border-right: 2px solid var(--primary); }
}
.faq-row__body { padding: 24px; flex: 1; }
.faq-row__q {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.faq-row__a { color: var(--on-surface-variant); line-height: 1.6; font-size: 16px; }

/* ---------- Final CTA ---------- */
.final-cta {
  position: relative;
  border: 2px solid var(--primary);
  background: var(--primary);
  color: var(--on-primary);
  padding: 48px 32px;
}
@media (min-width: 768px) { .final-cta { padding: 64px; } }
.final-cta__chip {
  position: absolute;
  top: 0;
  right: 0;
  padding: 6px 10px;
  border-left: 2px solid var(--on-primary);
  border-bottom: 2px solid var(--on-primary);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.final-cta__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
@media (min-width: 1024px) { .final-cta__grid { grid-template-columns: 2fr 1fr; } }
.final-cta__title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.final-cta__sub { font-size: 18px; opacity: 0.9; max-width: 600px; }
.final-cta__actions { display: flex; flex-direction: column; gap: 12px; }
.final-cta__micro {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.6;
  text-align: center;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--surface-container-lowest);
  border-top: 2px solid var(--primary);
  margin-top: 80px;
}
.site-footer__top {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
@media (min-width: 768px) { .site-footer__top { grid-template-columns: 2fr 1fr 1fr; } }
.site-footer__brand { display: flex; flex-direction: column; gap: 8px; }
.site-footer__brand-name {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 24px;
  letter-spacing: -0.04em;
}
.site-footer__col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
  margin-bottom: 12px;
}
.site-footer ul li {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 0;
}
.site-footer ul li a { padding: 2px 4px; transition: background 0.1s, color 0.1s; }
.site-footer ul li a:hover { background: var(--primary); color: var(--on-primary); }
.site-footer__bar {
  border-top: 2px solid var(--primary);
  padding: 16px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
}
@media (min-width: 768px) { .site-footer__bar { flex-direction: row; } }

/* ---------- Sub-page header (Case study, FAQ, Field Notes) ---------- */
.page-header {
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
  padding: 48px 32px;
  position: relative;
}
@media (min-width: 768px) { .page-header { padding: 64px; } }
.page-header__doc {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
}
.page-header__crumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--primary);
  border-left: 2px solid var(--primary);
  padding-left: 8px;
  margin-bottom: 16px;
  display: inline-block;
}
.page-header__title {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: clamp(40px, 6vw, 80px);
  line-height: 1;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}
.page-header__meta {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}
.page-header__meta strong { color: var(--primary); }

/* ---------- Case study specific ---------- */
.case-summary {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: stretch;
}
@media (min-width: 1024px) { .case-summary { grid-template-columns: 1fr 2fr; } }
.case-summary__directive {
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
  padding: 24px;
}
.case-summary__directive h3 {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--primary);
  padding-bottom: 8px;
  margin-bottom: 16px;
}
.case-summary__directive p { font-size: 17px; line-height: 1.5; }
.case-summary__metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 600px) { .case-summary__metrics { grid-template-columns: 1fr 1fr; } }
.case-summary__metrics .metric { padding: 24px; }
.case-summary__metrics .metric__value { font-size: 40px; }

.phases {
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--primary);
  border-left: 1px solid var(--primary);
}
@media (min-width: 768px) { .phases { grid-template-columns: repeat(3, 1fr); } }
.phase {
  border-right: 1px solid var(--primary);
  border-bottom: 1px solid var(--primary);
  padding: 24px;
  background: var(--surface-container-lowest);
}
.phase__head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.phase__head h4 {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.phase__body { font-size: 14px; color: var(--on-surface-variant); line-height: 1.6; }

.diagram {
  position: relative;
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
  overflow: hidden;
}
.diagram__head {
  border-bottom: 2px solid var(--primary);
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: var(--surface-container-lowest);
}
.diagram__head .scale { color: var(--outline); }
.diagram__body {
  position: relative;
  padding: 48px 32px;
  min-height: 240px;
  background-image:
    linear-gradient(to right, var(--outline-variant) 1px, transparent 1px),
    linear-gradient(to bottom, var(--outline-variant) 1px, transparent 1px);
  background-size: 20px 20px;
}
.flow {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: center;
}
@media (min-width: 768px) { .flow { flex-direction: row; gap: 32px; max-width: 720px; margin: 0 auto; } }
.flow__node {
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
  padding: 16px 24px;
  text-align: center;
  min-width: 140px;
}
.flow__node-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.flow__node-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--outline);
  margin-top: 6px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.flow__line {
  flex: 1;
  position: relative;
  height: 2px;
  background: var(--primary);
  min-width: 80px;
}
.flow__line::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
  width: 14px;
  height: 14px;
  background: var(--error);
  border: 2px solid var(--primary);
  z-index: 2;
}
.flow__line-label {
  position: absolute;
  left: 50%;
  top: -22px;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--surface-container-lowest);
  padding: 0 4px;
  color: var(--error);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

/* ---------- Article (Field Notes) ---------- */
.article {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}
@media (min-width: 1024px) { .article { grid-template-columns: 240px 1fr; gap: 64px; } }
.article__sidebar {
  font-family: var(--font-mono);
  font-size: 12px;
}
@media (min-width: 1024px) {
  .article__sidebar {
    position: sticky;
    top: calc(var(--header-height) + 24px);
    align-self: start;
  }
}
.article__sidebar h3 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border-top: 2px solid var(--primary);
  padding-top: 16px;
  margin-bottom: 16px;
}
.article__sidebar ul li {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--outline-variant);
  padding: 6px 0;
  color: var(--on-surface-variant);
}
.article__sidebar ul li strong { color: var(--primary); }
.article__directive {
  margin-top: 32px;
  border: 1px solid var(--primary);
  background: var(--surface-container-low);
  padding: 16px;
}
.article__directive h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.article__directive p { font-family: var(--font-body); font-size: 14px; line-height: 1.5; color: var(--on-surface); }

.prose { display: flex; flex-direction: column; gap: 28px; max-width: 740px; }
.prose .lede {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.4;
  border-left: 4px solid var(--primary);
  padding-left: 20px;
  color: var(--primary);
}
.prose h2 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 28px;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  margin-top: 24px;
}
.prose p { font-size: 17px; line-height: 1.7; color: var(--on-surface); }
.prose blockquote {
  margin: 0;
  border-left: 4px solid var(--primary);
  padding: 0 0 0 24px;
  font-family: var(--font-headline);
  font-style: italic;
  font-size: 20px;
  color: var(--on-surface-variant);
  line-height: 1.5;
}

.data-callout {
  border: 2px solid var(--primary);
  background: var(--surface-container-highest);
  padding: 24px;
  position: relative;
  margin: 8px 0;
}
.data-callout__chip {
  position: absolute;
  top: 0;
  left: 0;
  padding: 4px 8px;
  background: var(--primary);
  color: var(--on-primary);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.data-callout__list {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
}
.data-callout__list .row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px dotted var(--outline-variant);
  padding-bottom: 6px;
}
.data-callout__list .row strong { color: var(--primary); }
.data-callout__list .row span:first-child { color: var(--on-surface-variant); }

/* ---------- Field notes index list ---------- */
.notes-list { display: flex; flex-direction: column; }
.note-item {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 24px;
  padding: 24px;
  border-bottom: 1px solid var(--outline-variant);
  align-items: baseline;
  background: var(--surface-container-lowest);
  transition: background 0.15s;
}
.note-item:hover { background: var(--surface-container-low); }
.note-item__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--outline);
}
.note-item__title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}
.note-item__sub { font-size: 14px; color: var(--on-surface-variant); }
.note-item__date {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
}

/* ---------- Misc helpers ---------- */
.row-between { display: flex; flex-direction: column; gap: 16px; align-items: flex-start; justify-content: space-between; }
@media (min-width: 768px) { .row-between { flex-direction: row; align-items: center; } }

.material-symbols-outlined {
  font-family: 'Material Symbols Outlined';
  font-weight: normal;
  font-style: normal;
  font-size: 18px;
  line-height: 1;
  vertical-align: middle;
  display: inline-block;
}

/* ==========================================================================
   Sibling navigation: doc-tabs strip, index grid, pager
   ========================================================================== */

/* Doc-tabs: horizontal sibling navigator (sticky, scroll-snap on mobile) */
.doc-tabs {
  position: sticky;
  top: var(--header-height);
  z-index: 40;
  background: var(--surface-container-lowest);
  border-bottom: 2px solid var(--primary);
  margin: 0 calc(-1 * 24px);
}
.doc-tabs__inner {
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.doc-tabs__inner::-webkit-scrollbar { display: none; }
.doc-tabs__crumb {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  border-right: 2px solid var(--primary);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
  background: var(--surface-container-low);
  white-space: nowrap;
}
.doc-tabs__list {
  display: flex;
  align-items: stretch;
  flex: 1;
}
.doc-tabs__item {
  flex-shrink: 0;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 20px;
  border-right: 1px solid var(--outline-variant);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  white-space: nowrap;
  min-width: 200px;
  transition: background 0.15s, color 0.15s;
}
.doc-tabs__item:hover { background: var(--surface-container-low); color: var(--primary); }
.doc-tabs__item--active {
  background: var(--primary);
  color: var(--on-primary);
  border-right-color: var(--primary);
}
.doc-tabs__item-num { font-size: 10px; opacity: 0.6; letter-spacing: 0.2em; }
.doc-tabs__item--active .doc-tabs__item-num { opacity: 0.7; }
.doc-tabs__item-title { font-family: var(--font-headline); font-size: 13px; font-weight: 700; letter-spacing: -0.005em; text-transform: none; }

@media (min-width: 1024px) {
  .doc-tabs { margin: 0; }
  .doc-tabs__item { min-width: auto; }
}

/* Index grid for case studies / field notes */
.index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 700px) { .index-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1100px) { .index-grid { grid-template-columns: repeat(3, 1fr); } }

.index-card {
  display: flex;
  flex-direction: column;
  border: 2px solid var(--primary);
  background: var(--surface-container-lowest);
  padding: 28px;
  text-decoration: none;
  color: inherit;
  transition: background 0.15s, transform 0.15s;
  min-height: 320px;
}
.index-card:hover { background: var(--surface-container-low); }
.index-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--outline);
  margin-bottom: 24px;
}
.index-card__title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: -0.02em;
  line-height: 1.05;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.index-card__summary {
  font-size: 15px;
  color: var(--on-surface-variant);
  line-height: 1.5;
  flex: 1;
}
.index-card__meta {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--outline-variant);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--outline);
}
.index-card--draft { background: var(--surface-container-low); border-style: dashed; }
.index-card--draft .index-card__title { color: var(--on-surface-variant); }

/* Pager: prev / next at bottom of detail pages */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 2px solid var(--primary);
}
.pager__btn {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  background: var(--surface-container-lowest);
  transition: background 0.15s, color 0.15s;
}
.pager__btn:hover { background: var(--primary); color: var(--on-primary); }
.pager__btn--next { border-left: 2px solid var(--primary); text-align: right; align-items: flex-end; }
.pager__btn-eyebrow { color: var(--outline); }
.pager__btn:hover .pager__btn-eyebrow { color: var(--on-primary); opacity: 0.7; }
.pager__btn-title { font-family: var(--font-headline); font-size: 18px; font-weight: 700; letter-spacing: -0.01em; text-transform: none; }
.pager__btn--disabled { pointer-events: none; opacity: 0.3; }