/*
 * Section rhythm and responsive behaviour.
 * Breakpoints follow DESIGN.md: 3-up -> 2-up at 840px -> 1-up at 600px.
 */

.section { padding-block: 72px; }

/* White band alternating against the warm body canvas. */
.section--soft {
  background: var(--color-canvas);
  border-block: 1px solid var(--color-hairline);
}

.section__head { margin-bottom: var(--space-xl); }

.section__heading {
  font: var(--text-heading-1);
  letter-spacing: var(--tracking-heading-1);
  max-width: 28ch;
}

.section__lede {
  font: var(--text-body-md);
  color: var(--color-ink-muted);
  max-width: 68ch;
  margin-top: var(--space-sm);
}

.section__note {
  font: var(--text-caption);
  color: var(--color-ink-muted);
  margin-top: var(--space-md);
}

.section__subheading {
  font: var(--text-heading-2);
  letter-spacing: var(--tracking-heading-2);
  margin-bottom: var(--space-md);
}

/* ── Tablet: 840px ─────────────────────────────────────────────────── */

@media (max-width: 840px) {
  .card-grid,
  .card-grid--four,
  .step-list { grid-template-columns: repeat(2, 1fr); }

  .stat-row { grid-template-columns: 1fr; gap: var(--space-md); }

  .hero-band__headline {
    font: var(--text-display-2);
    letter-spacing: var(--tracking-display-2);
  }

  .site-footer__grid { grid-template-columns: 1fr 1fr; }

  /* Nav collapses to a disclosure menu. */
  .site-header__toggle { display: inline-flex; }

  .site-header__inner { flex-wrap: wrap; }

  .site-nav {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-xs);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-hairline);
  }

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

  .site-nav__link {
    min-height: 44px;
    display: flex;
    align-items: center;
    border-bottom: 0;
    border-left: 2px solid transparent;
    padding-inline: var(--space-sm);
    font: var(--text-body-md);
  }

  .site-nav__link[aria-current="page"] { border-left-color: var(--color-primary); }
}

/* ── Mobile: 600px ─────────────────────────────────────────────────── */

@media (max-width: 600px) {
  .card-grid,
  .card-grid--two,
  .card-grid--four,
  .step-list,
  .contact-grid,
  .site-footer__grid { grid-template-columns: 1fr; }

  .hero-band { padding-block: 56px; }

  .hero-band__headline {
    font: var(--text-heading-1);
    letter-spacing: var(--tracking-heading-1);
  }

  .hero-band__actions > * { width: 100%; }

  .section { padding-block: 48px; }

  .section__heading {
    font: var(--text-heading-2);
    letter-spacing: var(--tracking-heading-2);
  }

  .cta-band { padding: var(--space-lg); }
}