/* PBN Design System v1.0.0. Existing unlayered page CSS remains authoritative during migration. */
@layer pbn-system {
  .pbn-section {
    padding-block: var(--pbn-section-space);
    color: var(--pbn-color-text);
    background: var(--pbn-color-surface);
  }

  .pbn-section--soft {
    background: var(--pbn-color-background);
  }

  .pbn-container {
    width: min(calc(100% - (var(--pbn-gutter) * 2)), var(--pbn-container));
    margin-inline: auto;
  }

  .pbn-section-title {
    max-width: 820px;
    margin: 0;
    color: var(--pbn-color-heading);
    font-family: var(--pbn-font-family);
    font-size: var(--pbn-font-size-h2);
    line-height: var(--pbn-line-height-heading);
    letter-spacing: -0.025em;
  }

  .pbn-card,
  .pbn-route-card,
  .pbn-trust-card,
  .pbn-cta-panel {
    border: 1px solid var(--pbn-color-border);
    border-radius: var(--pbn-radius-card);
    background: var(--pbn-color-surface);
    box-shadow: var(--pbn-shadow-card);
  }

  .pbn-card,
  .pbn-route-card,
  .pbn-trust-card {
    padding: clamp(20px, 3vw, 30px);
  }

  .pbn-card h3,
  .pbn-route-card h3,
  .pbn-trust-card h3 {
    margin: 0;
    color: var(--pbn-color-heading);
    font-size: var(--pbn-font-size-h3);
    line-height: 1.2;
  }

  .pbn-card p,
  .pbn-route-card p,
  .pbn-trust-card p {
    color: var(--pbn-color-muted);
    line-height: var(--pbn-line-height-body);
  }

  .pbn-button {
    min-height: 52px;
    padding: 12px 20px;
    border: 1px solid transparent;
    border-radius: var(--pbn-radius-button);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: var(--pbn-color-primary);
    background: var(--pbn-color-surface);
    font: 800 var(--pbn-font-size-body)/1.2 var(--pbn-font-family);
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: transform var(--pbn-transition), box-shadow var(--pbn-transition);
  }

  .pbn-button--primary {
    color: var(--pbn-color-surface);
    background: var(--pbn-color-primary);
    box-shadow: var(--pbn-shadow-button);
  }

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

  .pbn-button:focus-visible,
  .pbn-faq summary:focus-visible {
    outline: 3px solid var(--pbn-color-focus);
    outline-offset: 3px;
  }

  .pbn-faq {
    display: grid;
    gap: 12px;
  }

  .pbn-faq details {
    border: 1px solid var(--pbn-color-border);
    border-radius: var(--pbn-radius-card);
    background: var(--pbn-color-surface);
  }

  .pbn-faq summary {
    padding: 18px 20px;
    color: var(--pbn-color-heading);
    font-weight: 800;
    cursor: pointer;
  }

  .pbn-faq details > :not(summary) {
    padding-inline: 20px;
    color: var(--pbn-color-muted);
  }

  .pbn-price-row {
    min-height: 58px;
    padding: 14px 0;
    border-bottom: 1px solid var(--pbn-color-border);
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 16px;
    color: var(--pbn-color-text);
  }

  .pbn-price-row strong {
    color: var(--pbn-color-heading);
  }

  .pbn-cta-panel {
    padding: clamp(24px, 5vw, 48px);
    background: var(--pbn-color-background);
  }

  @media (max-width: 767px) {
    .pbn-button {
      width: 100%;
      min-height: 56px;
    }

    .pbn-price-row {
      grid-template-columns: 1fr;
      gap: 4px;
    }
  }

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