.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(6, 7, 11, 0.82);
  border-bottom: 1px solid var(--color-line);
  backdrop-filter: blur(16px);
}

.header-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  gap: var(--space-5);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
}

.brand__logo {
  display: block;
  background: var(--color-graphite);
}

.brand__logo--wide {
  width: clamp(300px, 30vw, 480px);
  height: 64px;
  object-fit: contain;
  object-position: left center;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.site-nav a {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding-inline: var(--space-3);
  border-radius: var(--radius-sm);
}

.site-nav a:hover {
  color: var(--color-ink);
  background: rgba(134, 168, 223, 0.1);
}

.nav-cta {
  color: var(--color-ink);
  border: 1px solid var(--color-line);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 6px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.nav-toggle span:not(.sr-only) {
  width: 20px;
  height: 2px;
  background: var(--color-ink);
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-inline: var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-weight: 800;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

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

.button--primary {
  background: #ffffff;
  color: #07090d;
}

.button--primary:hover {
  background: rgba(255, 255, 255, 0.88);
}

.button--secondary {
  background: rgba(255, 255, 255, 0.03);
  color: #ffffff;
  border-color: var(--color-line-strong);
}

.eyebrow {
  margin-bottom: var(--space-3);
  color: var(--color-copper);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.research-card,
.research-modal__panel {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
}

.site-footer {
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
}

.footer-layout {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    inset: 76px 16px auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-3);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    background: #0b0f17;
    box-shadow: var(--shadow-soft);
  }

  .site-nav.is-open {
    display: flex;
  }

  .brand__logo--wide {
    width: min(64vw, 300px);
    height: 54px;
  }

  .site-nav a {
    justify-content: center;
  }

  .footer-layout {
    align-items: flex-start;
    justify-content: center;
    flex-direction: column;
  }
}