:root {
  --paper: #F7F5F0;
  --paper-dim: #F0EDF2;
  --ink: #4C4556;
  --ink-soft: #7A7387;
  --teal: #872642;
  --teal-deep: #5E1B2E;
  --amber: #F6C026;
  --rose: #A0D3F9;
  --line: #DCD7E0;
  --radius: 3px;
  --max-w: 780px;
  --max-w-wide: 1040px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', sans-serif;
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 0.5em 0;
  letter-spacing: -0.01em;
}

h1 { font-weight: 700; }
h2 { font-weight: 600; }
h3 { font-weight: 600; font-size: 1.05rem; }

a { color: var(--teal-deep); }
a:hover { color: var(--teal); }

.mono {
  font-family: 'IBM Plex Mono', monospace;
  letter-spacing: 0.01em;
}

/* -------- Nav -------- */
.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-w-wide);
  margin: 0 auto;
  padding: 28px 24px 12px;
}

.site-nav .brand {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--ink);
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

.site-nav a {
  text-decoration: none;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

.site-nav a:hover, .site-nav a.active {
  color: var(--ink);
  border-bottom-color: var(--amber);
}

@media (max-width: 640px) {
  .site-nav { flex-direction: column; gap: 14px; align-items: flex-start; }
  .site-nav ul { gap: 18px; flex-wrap: wrap; }
}

/* -------- Field-note tag: signature element -------- */
.tag {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--ink);
  color: var(--paper);
  padding: 7px 16px;
  border-radius: 999px;
  line-height: 1.4;
}

.tag.amber { background: var(--amber); color: var(--ink); }
.tag.rose { background: var(--rose); color: var(--ink); }

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px 0 0;
}

/* -------- Hero -------- */
.hero {
  max-width: var(--max-w-wide);
  margin: 0 auto;
  padding: 40px 24px 60px;
}

.hero .eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  color: var(--teal-deep);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  max-width: 14ch;
}

.hero-sub {
  font-family: 'Source Serif 4', serif;
  font-size: 1.25rem;
  color: var(--ink-soft);
  max-width: 46ch;
  margin-top: 18px;
}

/* -------- Layout helpers -------- */
.wrap { max-width: var(--max-w-wide); margin: 0 auto; padding: 0 24px; }
.wrap > p, .wrap > ul { max-width: 640px; }

.about-flex {
  display: flex;
  gap: 36px;
  align-items: flex-start;
}

.about-photo {
  flex-shrink: 0;
}

.about-photo img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--amber);
  display: block;
}

.about-text { max-width: 640px; }
.about-text h2 { margin-top: 0; }
.about-text > p { max-width: none; }

@media (max-width: 640px) {
  .about-flex {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .about-photo img { width: 140px; height: 140px; }
}
.wrap-wide { max-width: var(--max-w-wide); margin: 0 auto; padding: 0 24px; }

section { padding: 46px 0; }
section.divider { border-top: 1px solid var(--line); }

/* -------- Strength / stat grid -------- */
.stat-strip {
  display: flex;
  gap: 20px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  padding: 30px;
  margin: 24px 0;
}

.stat-strip > div {
  flex: 1 1 0;
  min-width: 0;
}

@media (max-width: 640px) {
  .stat-strip { flex-direction: column; }
}

.stat-strip .stat-num {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 2.4rem;
  color: var(--amber);
  display: block;
  line-height: 1;
}

.stat-strip .stat-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--paper);
  opacity: 0.85;
  margin-top: 8px;
  display: block;
}

.strength-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 22px;
  margin-top: 20px;
  margin-bottom: 20px;
}

.strength-grid .item h3 {
  color: var(--teal-deep);
  margin-bottom: 6px;
}

.strength-grid .item p {
  margin: 0;
  font-size: 0.98rem;
  color: var(--ink-soft);
}

/* -------- Buttons / CTA -------- */
.btn {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
}

.btn:hover { background: var(--teal-deep); border-color: var(--teal-deep); color: var(--paper); }

.btn.outline {
  background: transparent;
  color: var(--ink);
}
.btn.outline:hover { background: var(--ink); color: var(--paper); }

/* -------- Case study cards (index) -------- */
.cs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 26px;
  margin-top: 28px;
}

.cs-card {
  background: white;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  text-decoration: none;
  color: var(--ink);
  display: block;
  position: relative;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cs-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(28,43,57,0.08);
}

.cs-card .cs-eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--teal-deep);
  letter-spacing: 0.05em;
}

.cs-card h3 {
  margin-top: 8px;
  font-size: 1.15rem;
}

.cs-card .cs-stat {
  margin-top: 14px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  color: var(--teal-deep);
}

/* -------- Case study page -------- */
.cs-header {
  max-width: var(--max-w-wide);
  margin: 0 auto;
  padding: 10px 24px 30px;
}

.cs-header .company {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--teal-deep);
}

.cs-header h1 {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  max-width: 22ch;
  margin-top: 10px;
}

.skim-box {
  max-width: var(--max-w-wide);
  margin: 0 auto 10px;
  padding: 0 24px;
}

.problem-outcome {
  background: var(--paper-dim);
  border-left: 4px solid var(--rose);
  border-radius: var(--radius);
  padding: 22px 26px;
  margin: 26px 0;
  font-size: 1.05rem;
}

.problem-outcome strong { color: var(--teal-deep); }

details.full-detail {
  max-width: var(--max-w-wide);
  margin: 10px auto 60px;
  padding: 0 24px;
}

details.full-detail summary {
  cursor: pointer;
  list-style: none;
  font-family: 'IBM Plex Mono', monospace;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

details.full-detail summary::-webkit-details-marker { display: none; }

details.full-detail summary::after {
  content: "+ Expand";
  color: var(--teal-deep);
}

details.full-detail[open] summary::after {
  content: "\2212 Collapse";
}

details.full-detail summary:focus-visible,
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.detail-body { max-width: var(--max-w-wide); margin: 0 auto; padding-top: 30px; }
.detail-body > p, .detail-body > ul, .detail-body .finding, .detail-body blockquote.pull { max-width: 640px; }

.detail-body h3 {
  margin-top: 38px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  color: var(--teal-deep);
}

.detail-body h3:first-child { margin-top: 10px; }

.finding {
  margin: 20px 0;
  padding-left: 18px;
  border-left: 3px solid var(--amber);
}

.finding .finding-stat {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  color: var(--teal-deep);
}

.blueprint {
  margin: 30px 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.blueprint-title {
  background: var(--ink);
  color: var(--paper);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 12px 16px;
}

.bp-header-row, .bp-row {
  display: grid;
  grid-template-columns: 130px repeat(6, 1fr);
}

.bp-header-row { background: var(--paper-dim); }

.bp-header-cell {
  padding: 8px 8px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  border-right: 1px solid var(--line);
}
.bp-header-cell:last-child { border-right: none; }
.bp-header-cell:first-child { background: var(--ink); }

.bp-row { border-top: 1px solid var(--line); }

.bp-label {
  background: var(--paper-dim);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  padding: 10px 10px;
  display: flex;
  align-items: center;
  border-right: 1px solid var(--line);
}

.bp-cell {
  padding: 9px 9px;
  font-family: 'Source Serif 4', serif;
  font-size: 0.78rem;
  color: var(--ink);
  border-right: 1px solid var(--line);
  display: flex;
  align-items: center;
  line-height: 1.3;
}
.bp-cell:last-child { border-right: none; }

.bp-cell.empty {
  color: var(--line);
  font-family: 'IBM Plex Mono', monospace;
}

.bp-row.customer .bp-cell { background: rgba(246,192,38,0.16); }
.bp-row.frontstage-emp .bp-cell, .bp-row.frontstage-tech .bp-cell { background: rgba(160,211,249,0.18); }
.bp-row.backstage .bp-cell { background: rgba(76,69,86,0.06); }
.bp-row.support .bp-cell { background: rgba(135,38,66,0.06); }

.bp-cell.friction {
  border: 1.5px solid var(--teal) !important;
  background: rgba(135,38,66,0.14) !important;
  font-weight: 500;
}

.bp-cell.improved {
  border: 1.5px solid var(--amber) !important;
  background: rgba(246,192,38,0.28) !important;
  font-weight: 500;
}

.blueprint-caption {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: var(--ink-soft);
  padding: 10px 16px 14px;
  background: var(--paper-dim);
}

.cs-visual {
  max-width: 640px;
  margin: 26px 0;
}

.cs-visual svg {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.cs-visual figcaption {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: var(--ink-soft);
  margin-top: 8px;
}

.stat-bar-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
}

.stat-bar-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
  color: var(--ink);
  width: 140px;
  flex-shrink: 0;
}

.stat-bar-track {
  flex: 1;
  background: var(--paper-dim);
  border-radius: var(--radius);
  overflow: hidden;
  height: 26px;
}

.stat-bar-fill {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 10px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink);
  box-sizing: border-box;
}

.stat-bar-fill.rose { background: var(--teal); color: var(--paper); }
.stat-bar-fill.blue { background: var(--rose); }

blockquote.pull {
  font-family: 'Source Serif 4', serif;
  font-style: italic;
  font-size: 1.15rem;
  color: var(--ink);
  border-left: 3px solid var(--teal);
  margin: 22px 0;
  padding: 6px 0 6px 22px;
}

.timeline-note {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

footer {
  max-width: var(--max-w-wide);
  margin: 0 auto;
  padding: 40px 24px 60px;
  border-top: 1px solid var(--line);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem;
  color: var(--ink-soft);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}