:root {
  --bg: #ffffff;
  --ink: #0a0a0a;
  --ink-muted: #2f2f2f;
  --surface: #ffffff;
  --line: #111111;
  --radius: 6px;
  --content: 1120px;
  --font-display: "Source Serif 4", "Source Serif Pro", "Times New Roman", serif;
  --font-text: "Source Serif 4", "Source Serif Pro", "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font-text);
  line-height: 1.7;
}

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

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

.container {
  width: min(92vw, var(--content));
  margin: 0 auto;
}

header.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--line);
}

.top-bar {
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.top-bar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
}

.top-bar strong {
  font-weight: 600;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.02em;
  font-style: italic;
}

.brand-logo {
  width: 54px;
  height: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-display);
  font-size: 14px;
}

.nav-links a {
  padding: 6px 10px;
  border-radius: 0;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: #000;
}

.hero {
  padding: 60px 0 40px;
}

.hero-grid {
  display: grid;
  gap: 40px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
}

.kicker {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 12px;
  color: var(--ink-muted);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 4.6vw, 3.8rem);
  line-height: 1.1;
  margin: 12px 0 16px;
}

.hero p {
  font-size: 1.05rem;
  color: var(--ink-muted);
  margin: 0 0 24px;
}

.cta-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-radius: 0;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.02em;
  border: 1px solid var(--ink);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button.primary {
  background: var(--ink);
  color: #fff;
}

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

.button:hover {
  transform: translateY(-2px);
}

.hero-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--line);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.metric {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.metric strong {
  display: block;
  font-family: var(--font-display);
  font-size: 20px;
}

.section {
  padding: 70px 0;
}

.section-title {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 28px;
}

.section-title h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  margin: 0;
}

.section-title p {
  margin: 0;
  color: var(--ink-muted);
  max-width: 460px;
}

.grid-3 {
  display: grid;
  gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--line);
  position: relative;
}

.card h3 {
  font-family: var(--font-display);
  margin: 0 0 8px;
}

.card p {
  margin: 0;
  color: var(--ink-muted);
}

.timeline {
  display: grid;
  gap: 18px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 18px;
  background: var(--surface);
  border-radius: 16px;
  border: 1px solid var(--line);
}

.timeline-item span {
  font-family: var(--font-display);
  color: var(--ink-muted);
}

.research-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.research-card {
  background: var(--surface);
  border-radius: 18px;
  padding: 18px;
  border: 1px solid var(--line);
}

.research-card h4 {
  margin: 0 0 10px;
  font-family: var(--font-display);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 0;
  border: 1px solid var(--ink);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 12px;
  margin-bottom: 12px;
}

.disclaimer {
  background: #111111;
  color: #f5f5f5;
  border-radius: var(--radius);
  padding: 24px;
  font-size: 0.95rem;
}

footer {
  padding: 40px 0 60px;
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--ink-muted);
}

.footer-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.footer-grid a {
  color: var(--ink);
}

.partner-marquee {
  overflow: hidden;
  border: 1px solid var(--line);
  padding: 16px 0;
  background: #fff;
}

.partner-track {
  display: flex;
  gap: 48px;
  width: max-content;
  animation: marquee 22s linear infinite;
  align-items: center;
  padding: 4px 24px;
}

.partner-item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 140px;
}

.partner-item img {
  height: 28px;
  max-width: 160px;
  width: auto;
  filter: grayscale(100%);
  opacity: 0.85;
}

@keyframes marquee {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

.partner-marquee:hover .partner-track {
  animation-play-state: paused;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hero-illustration {
  width: 100%;
  height: auto;
  border-radius: 0;
  background: transparent;
  padding: 0;
}

@media (max-width: 720px) {
  .nav-links {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }
}