:root {
  --green: #5fa147;
  --green-light: #a8d89a;
  --deep: #102a22;
  --text: #20352c;
  --muted: #66766d;
  --paper: #f7f8f5;
  --line: #e0e6df;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 85px;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
}

a { color: inherit; text-decoration: none; }

.site-header {
  height: 76px;
  padding: 0 7%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: rgba(247, 248, 245, .95);
}

.brand {
  font-size: 1.45rem;
  font-weight: 650;
  letter-spacing: -.065em;
}

.site-header nav {
  display: flex;
  gap: clamp(18px, 3vw, 38px);
  font-size: .88rem;
}

.site-header nav a:hover { color: var(--green); }

.hero {
  min-height: 650px;
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  align-items: center;
  padding: 35px 5% 45px 8%;
  overflow: visible;
  background:
    radial-gradient(ellipse at 76% 50%, #e2ebdf 0%, transparent 46%),
    var(--paper);
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 550px;
  padding: 40px 0;
}

.eyebrow {
  color: #548848;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .16em;
  line-height: 1.7;
}

.hero h1 {
  max-width: 540px;
  margin: 22px 0;
  font-size: clamp(2.8rem, 5vw, 5.2rem);
  line-height: 1.01;
  letter-spacing: -.065em;
  font-weight: 570;
}

.hero-description {
  max-width: 430px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

.hero-link {
  display: inline-flex;
  gap: 20px;
  align-items: center;
  margin-top: 23px;
  padding: 14px 0;
  border-bottom: 1px solid var(--green);
  font-size: .9rem;
  font-weight: 650;
}

.hero-link span { color: var(--green); font-size: 1.2rem; }

.hero-caption {
  margin-top: 65px;
  color: #78877d;
  font-size: .64rem;
  letter-spacing: .13em;
}

.hero-visual {
  position: relative;
  width: 100%;
  height: min(650px, 68vw);
  min-height: 420px;
  overflow: visible;
  border-radius: 0;
  isolation: isolate;
}

.hero-visual::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 12%;
  border-radius: 50%;
  background: radial-gradient(circle, #d5e7d0 0%, #e8efe5 38%, transparent 72%);
}

#biology-canvas {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
}

.scene-label {
  position: absolute;
  left: 7%;
  right: 7%;
  color: #667c6b;
  font: 9px/1.5 monospace;
  letter-spacing: .12em;
  pointer-events: none;
}

.scene-label-top { top: 7%; }
.scene-label-top span { float: right; }
.scene-label-bottom { bottom: 6%; }

.scene-loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #52784c;
  font-size: .8rem;
  pointer-events: none;
}

.scene-loading[hidden] { display: none; }

.section { padding: 100px 9%; }

.intro {
  background: white;
  border-top: 1px solid var(--line);
}

.section h2 {
  max-width: 720px;
  margin: 12px 0 20px;
  font-size: clamp(2rem, 3.8vw, 3.4rem);
  font-weight: 550;
  line-height: 1.12;
  letter-spacing: -.045em;
}

.intro > p:last-child,
.contact > p:last-child {
  max-width: 690px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.activities { background: #edf2ea; }

.activity-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 45px;
  border-top: 1px solid #cdd8ca;
}

.activity-grid article {
  padding: 24px 20px 12px 0;
}

.activity-grid article + article {
  padding-left: 22px;
  border-left: 1px solid #cdd8ca;
}

.activity-grid article > span {
  color: var(--green);
  font: .75rem monospace;
}

.activity-grid h3 {
  margin: 25px 0 12px;
  font-size: 1.1rem;
  font-weight: 600;
}

.activity-grid p {
  color: var(--muted);
  font-size: .9rem;
  line-height: 1.7;
}

.contact { background: white; }

footer {
  padding: 35px 8%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 15px 30px;
  color: #d8e3da;
  background: var(--deep);
}

footer .brand { color: white; }
footer p { font-size: .78rem; }

@media (max-width: 800px) {
  .site-header { padding: 0 5%; }
  .site-header nav { gap: 15px; font-size: .78rem; }

  .hero {
    grid-template-columns: 1fr;
    padding: 38px 7% 30px;
  }

  .hero-copy { padding-bottom: 0; }
  .hero h1 { max-width: 620px; font-size: clamp(2.8rem, 9vw, 4.5rem); }
  .hero-caption { margin-top: 30px; }

  .hero-visual {
    height: min(105vw, 540px);
    min-height: 320px;
    margin-top: 0;
  }

  .section { padding: 70px 7%; }
  .activity-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .activity-grid article { padding: 22px 16px 22px 0; }
  .activity-grid article + article { padding-left: 16px; }
  .activity-grid article:nth-child(3) {
    border-left: 0;
    padding-left: 0;
  }
}

@media (max-width: 450px) {
  .site-header { height: 66px; }
  .brand { font-size: 1.25rem; }
  .site-header nav { gap: 11px; font-size: .72rem; }
  .hero-visual { min-height: 300px; }
  .activity-grid h3 { font-size: 1rem; }
  footer { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}