:root {
  color-scheme: light;
  --brand: #12a166;
  --ink: #182e27;
  --muted: #65756e;
  --border: #e1e8e4;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: #f5f7f6;
  font-synthesis: none;
}

* { box-sizing: border-box; }
body { margin: 0; border-top: 4px solid var(--brand); }
.page-shell { max-width: 1120px; margin: 0 auto; padding: 0 40px; }
main { padding: 56px 0 48px; }
h1 { margin: 0; font-size: clamp(28px, 5vw, 36px); letter-spacing: -1px; line-height: 1.12; font-weight: 650; }
.preview-note { margin: 12px 0 28px; color: var(--muted); font-size: 13px; line-height: 1.6; }
.audience-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.audience-card { background: #fff; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; box-shadow: 0 4px 16px #183e2805; }
.card-heading { padding: 22px 28px; border-top: 3px solid var(--brand); }
h2 { margin: 0; font-size: 23px; letter-spacing: -.6px; font-weight: 650; }
.ad-list { list-style: none; margin: 0; padding: 0 16px 16px; }
.ad-list li { border-top: 1px solid #edf0ee; }
.ad-link { display: flex; align-items: center; gap: 16px; padding: 18px 12px; color: #087a4a; text-decoration: none; border-radius: 6px; transition: background-color .15s; }
.ad-link:hover { background: #eff8f3; }
.ad-link:focus-visible { outline: 3px solid var(--brand); outline-offset: -3px; background: #eff8f3; }
.ad-size { font-size: 16px; font-weight: 650; font-variant-numeric: tabular-nums; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 700px) {
  .page-shell { padding: 0 20px; }
  main { padding: 36px 0; }
  .audience-grid { grid-template-columns: 1fr; gap: 20px; }
  .card-heading { padding: 24px 24px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .ad-link { transition: none; }
}

.prb-number { margin: 8px 0 0; color: var(--muted); font-size: 12px; letter-spacing: .4px; }