:root {
  --accent: #00C9A7;
  --accent-dark: #008f7a;
  --ink: #152322;
  --text: #33413f;
  --muted: #697674;
  --line: #e2e8e6;
  --paper: #f7faf8;
  --white: #ffffff;
  --soft: #edf8f5;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.62;
  overflow-x: hidden;
}

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

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 14px clamp(22px, 5vw, 72px);
  background: rgba(247, 250, 248, 0.9);
  border-bottom: 1px solid rgba(226, 232, 230, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 190px;
  font-weight: 700;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 4px;
}

.brand span {
  display: block;
  line-height: 1.15;
}

.brand small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 600;
}

.main-nav {
  display: flex;
  justify-content: center;
  gap: 26px;
  color: #3d4c49;
  font-size: 0.88rem;
  font-weight: 650;
}

.main-nav a {
  position: relative;
  padding: 6px 0;
}

.main-nav a::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  content: "";
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 160ms ease;
}

.main-nav a:hover::after,
.main-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-cta,
.button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 750;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.nav-cta {
  padding: 0 16px;
  color: var(--white);
  background: var(--ink);
}

.button {
  padding: 0 18px;
}

.primary {
  color: var(--white);
  background: var(--accent);
}

.secondary {
  color: var(--ink);
  background: transparent;
  border-color: var(--line);
}

.light {
  color: var(--ink);
  background: var(--white);
}

.nav-cta:hover,
.button:hover {
  transform: translateY(-1px);
}

main {
  min-height: calc(100vh - 160px);
}

.split-section,
.intro-line,
.feature-grid,
.journal-callout,
.content-section,
.iybh-panel {
  margin-right: clamp(22px, 5vw, 72px);
  margin-left: clamp(22px, 5vw, 72px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.72fr);
  gap: clamp(36px, 6vw, 84px);
  align-items: center;
  min-height: calc(100vh - 68px);
  padding: clamp(58px, 9vw, 108px) 0 clamp(42px, 7vw, 78px);
}

.hero > * {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-dark);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 720px;
  margin-bottom: 20px;
  font-size: clamp(2.7rem, 6vw, 5.6rem);
  font-weight: 760;
  letter-spacing: 0;
  line-height: 0.98;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(1.55rem, 3vw, 2.85rem);
  font-weight: 740;
  letter-spacing: 0;
  line-height: 1.08;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.02rem;
}

.lede {
  max-width: 640px;
  color: var(--text);
  font-size: clamp(1.02rem, 1.45vw, 1.2rem);
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.science-field {
  position: relative;
  min-height: 470px;
  overflow: hidden;
  padding: clamp(26px, 4vw, 44px);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.science-field::before {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(90deg, rgba(0, 201, 167, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(0, 201, 167, 0.08) 1px, transparent 1px);
  background-size: 42px 42px;
}

.science-topline,
.science-notes,
.science-diagram {
  position: relative;
  z-index: 1;
}

.science-topline {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.science-topline span,
.science-notes p {
  margin: 0;
  color: var(--accent-dark);
  background: var(--soft);
  border: 1px solid rgba(0, 201, 167, 0.2);
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.science-topline span {
  padding: 6px 10px;
}

.science-diagram {
  width: min(86%, 420px);
  aspect-ratio: 1;
  margin: clamp(34px, 6vw, 58px) auto;
  border: 1px solid rgba(0, 201, 167, 0.35);
  border-radius: 50%;
}

.science-diagram::before,
.science-diagram::after {
  position: absolute;
  content: "";
  border: 1px solid rgba(0, 201, 167, 0.35);
  border-radius: 50%;
}

.science-diagram::before {
  inset: 16%;
}

.science-diagram::after {
  inset: 32%;
  background: var(--accent);
}

.science-diagram span {
  position: absolute;
  width: 13px;
  height: 13px;
  background: var(--ink);
  border-radius: 50%;
}

.science-diagram span:nth-child(1) { top: 12%; left: 46%; }
.science-diagram span:nth-child(2) { right: 14%; top: 48%; background: var(--accent); }
.science-diagram span:nth-child(3) { bottom: 15%; left: 30%; background: var(--accent-dark); }
.science-diagram span:nth-child(4) { top: 38%; left: 8%; }

.science-notes {
  display: grid;
  gap: 10px;
}

.science-notes p {
  width: fit-content;
  padding: 8px 12px;
  color: var(--text);
  background: transparent;
  border-color: var(--line);
  text-transform: none;
}

.intro-line {
  padding: 30px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.intro-line p {
  max-width: 980px;
  margin-bottom: 0;
  color: var(--text);
  font-size: clamp(1.05rem, 2vw, 1.45rem);
  line-height: 1.45;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 54px;
  margin-bottom: 54px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--line);
}

.feature-grid article {
  min-height: 260px;
  padding: clamp(24px, 4vw, 40px);
  background: var(--white);
}

.feature-grid span {
  display: inline-block;
  margin-bottom: 68px;
  color: var(--accent-dark);
  font-size: 0.8rem;
  font-weight: 800;
}

.feature-grid p,
.content-section p,
.company-list dd,
.iybh-panel p {
  color: var(--muted);
}

.journal-callout {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 72px;
  padding: clamp(28px, 5vw, 52px);
  color: var(--white);
  background: var(--ink);
  border-radius: 6px;
}

.journal-callout p {
  max-width: 680px;
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.76);
}

.journal-callout .eyebrow {
  color: var(--accent);
}

.journal-callout h2 {
  margin-bottom: 12px;
}

.page-hero {
  padding: clamp(54px, 8vw, 96px) 0 42px;
  border-bottom: 1px solid var(--line);
}

.page-hero p {
  max-width: 760px;
  color: var(--text);
  font-size: 1.08rem;
}

.content-section {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(320px, 1fr);
  gap: clamp(32px, 6vw, 84px);
  padding: 58px 0;
  border-bottom: 1px solid var(--line);
}

.company-list {
  margin: 0;
  border-top: 1px solid var(--line);
}

.company-list div {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

dt {
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

dd {
  margin: 0;
  font-weight: 650;
}

address {
  color: var(--text);
  font-style: normal;
  font-weight: 650;
}

.iybh-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(280px, 0.55fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: stretch;
  margin-top: 54px;
  margin-bottom: 72px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.iybh-copy {
  padding: clamp(28px, 5vw, 54px);
}

.iybh-art {
  display: grid;
  min-height: 360px;
  place-items: center;
  padding: 30px;
  background: var(--accent);
}

.iybh-art img {
  max-height: 160px;
  object-fit: contain;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 24px clamp(22px, 5vw, 72px);
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.86rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--accent-dark);
  font-weight: 750;
}

@media (max-width: 900px) {
  .site-header {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .main-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero,
  .content-section,
  .iybh-panel {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid article {
    min-height: 0;
  }

  .feature-grid span {
    margin-bottom: 34px;
  }

  .journal-callout,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  body {
    font-size: 14px;
  }

  .site-header {
    display: grid;
    grid-template-columns: 1fr;
    padding: 12px 18px;
  }

  .brand {
    min-width: 0;
  }

  .nav-cta {
    width: 100%;
  }

  .main-nav {
    gap: 18px;
    font-size: 0.84rem;
  }

  .split-section,
  .intro-line,
  .feature-grid,
  .journal-callout,
  .content-section,
  .iybh-panel {
    margin-right: 18px;
    margin-left: 18px;
  }

  .hero {
    padding-top: 42px;
  }

  .hero-copy,
  .page-hero,
  .content-section,
  .iybh-copy {
    min-width: 0;
  }

  h1 {
    font-size: clamp(2.35rem, 13vw, 3.15rem);
  }

  h2 {
    font-size: clamp(1.45rem, 8vw, 2.05rem);
  }

  .science-field {
    width: 100%;
    max-width: calc(100vw - 36px);
    min-height: 380px;
    padding: 22px;
  }

  .lede,
  .hero-copy p,
  .page-hero p,
  .content-section p,
  .iybh-panel p {
    max-width: 100%;
    overflow-wrap: break-word;
  }

  .company-list div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .action-row .button {
    width: 100%;
  }

  .iybh-art {
    min-height: 220px;
  }
}