:root {
  --site-green: #174936;
  --site-green-dark: #0f3426;
  --site-gold: #d6aa42;
  --site-ink: #1e2522;
  --site-muted: #5f6964;
  --site-paper: #fbfcfa;
  --site-border: #dfe5e1;
}

body {
  color: var(--site-ink);
  background: var(--site-paper);
  font-size: 1.04rem;
  line-height: 1.7;
}

.navbar {
  border-bottom: 1px solid var(--site-border);
}

.navbar-title,
.nav-link:hover,
a {
  color: var(--site-green);
}

a:hover { color: var(--site-green-dark); }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
  gap: 4rem;
  align-items: center;
  max-width: 1180px;
  margin: 2.5rem auto 4rem;
  padding: 0 1.5rem;
}

.hero-copy h1 {
  font-size: clamp(2.8rem, 7vw, 5.4rem);
  line-height: .98;
  letter-spacing: -.045em;
  margin-bottom: 1rem;
}

.hero-copy h2 {
  color: var(--site-green);
  font-size: 1.5rem;
  margin-bottom: .25rem;
}

.research-line {
  margin: 1.4rem 0;
  color: var(--site-green);
  font-weight: 650;
  letter-spacing: .015em;
}

.research-line span { color: var(--site-gold); padding: 0 .35rem; }

.hero-statement {
  margin: 1.6rem 0 .8rem;
  font-size: clamp(1.45rem, 3vw, 2.15rem);
  line-height: 1.25;
  font-weight: 700;
  max-width: 760px;
}

.hero-photo img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 18px;
  box-shadow: 0 18px 50px rgba(15, 52, 38, .18);
}

.btn-primary {
  background: var(--site-green);
  border-color: var(--site-green);
}

.btn-primary:hover {
  background: var(--site-green-dark);
  border-color: var(--site-green-dark);
}

.btn-outline-primary {
  color: var(--site-green);
  border-color: var(--site-green);
}

.research-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin: 1.5rem 0 3rem;
}

.research-card {
  background: white;
  border: 1px solid var(--site-border);
  border-top: 4px solid var(--site-gold);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 8px 24px rgba(20, 55, 40, .06);
}

.research-card h3 { color: var(--site-green); margin-top: 0; }

main.content { max-width: 980px; }

h1, h2, h3 { letter-spacing: -.02em; }
h2 { margin-top: 2.25rem; }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2rem; }
  .hero-photo { order: -1; max-width: 560px; }
  .research-cards { grid-template-columns: 1fr; }
}