:root {
  --ink: #2a1f1a;
  --paper: #f8f4ee;
  --warm-mid: #ede5da;
  --accent: #b85c38;
  --accent-pale: #f5e8e2;
  --muted: #9a8c82;
  --rule: rgba(42, 31, 26, 0.12);
  --serif: 'Playfair Display', Georgia, serif;
  --sans: 'DM Sans', system-ui, sans-serif;
  --mono: 'DM Mono', monospace;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  opacity: 0;
  transition: opacity 300ms ease;
}

body.page-ready { opacity: 1; }

.case-study-page { min-height: 100vh; }
.cs-hero {
  background: var(--ink);
  color: var(--paper);
  padding: 8rem 5rem 4rem;
}
.cs-back {
  color: var(--accent);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.cs-hero-grid {
  margin-top: 2rem;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
}
.cs-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--accent);
}
h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.1;
  margin: 1rem 0;
}
.cs-details { display: grid; gap: 1rem; }
.cs-detail-item { border-top: 1px solid rgba(248, 244, 238, 0.2); padding-top: 0.8rem; }
.cs-detail-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(248, 244, 238, 0.65);
}
.cs-detail-value { font-size: 0.9rem; }

.cs-content { max-width: 920px; padding: 4rem 5rem 6rem; }
.cs-section { margin-bottom: 2.75rem; }
h2 {
  font-family: var(--serif);
  font-size: 1.6rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  margin-bottom: 1rem;
}
p, li { line-height: 1.75; color: var(--ink); }
ul { padding-left: 1.2rem; }

.cs-impact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.impact-card {
  background: var(--ink);
  color: var(--paper);
  padding: 1.3rem;
}
.impact-number {
  display: block;
  font-family: var(--serif);
  font-size: 1.8rem;
  color: var(--accent);
}
.impact-label { font-size: 0.82rem; color: rgba(248, 244, 238, 0.86); }

.not-found {
  padding: 6rem 1.5rem;
  max-width: 640px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .cs-hero { padding: 6rem 1.5rem 3rem; }
  .cs-hero-grid { grid-template-columns: 1fr; }
  .cs-content { padding: 2.5rem 1.5rem 4rem; }
  .cs-impact-grid { grid-template-columns: 1fr; }
}