.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--space-2xl); }
.section--tight { padding-block: var(--space-xl); }

.section-head {
  max-width: 640px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  margin-bottom: var(--space-lg);
}
.section-head--split {
  max-width: none;
  flex-direction: row;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-md);
}

.grid { display: grid; gap: var(--space-lg); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.stack { display: flex; flex-direction: column; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.dark-section {
  background: var(--color-dark-bg);
  color: var(--color-dark-ink);
}
.dark-section p { color: var(--color-dark-ink-soft); }
.dark-section h1, .dark-section h2, .dark-section h3, .dark-section h4 { color: var(--color-dark-ink); }

/* Header */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: var(--z-nav);
  padding-block: var(--space-md);
  transition: padding var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}
.site-header.is-scrolled {
  padding-block: var(--space-xs);
  background: rgba(251, 249, 244, .92);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: var(--fs-sm);
  font-weight: 500;
}
.nav-links a {
  padding-block: var(--space-xs);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

main { padding-top: 88px; }

/* Footer */
.site-footer {
  background: var(--color-dark-bg);
  color: var(--color-dark-ink);
  padding-block: var(--space-2xl) var(--space-md);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.3fr repeat(3, 1fr);
  gap: var(--space-lg);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-dark-line);
}
.footer-top a {
  display: block;
  color: var(--color-dark-ink-soft);
  font-size: var(--fs-sm);
  padding-block: var(--space-3xs);
  transition: color var(--duration-fast) var(--ease-out);
}
.footer-top a:hover { color: var(--color-dark-ink); }
.footer-social { display: flex; gap: var(--space-sm); margin-top: var(--space-2xs); }
.footer-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  background: var(--color-dark-line);
  color: var(--color-dark-ink-soft);
}
.footer-social a:hover { background: var(--color-bronze); color: var(--color-dark-bg); }
.footer-social svg { width: 18px; height: 18px; }
.footer-heading {
  color: var(--color-dark-ink);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding-top: var(--space-md);
  font-size: var(--fs-xs);
  color: var(--color-dark-ink-soft);
}