.viewer-masthead { position: sticky; top: 0; z-index: 5; background: var(--ink); }
.viewer-masthead .library-masthead__inner { min-height: 84px; }
.viewer { padding-block: 48px 80px; }
.viewer h1 { max-width: 800px; margin: 0 0 16px; font-family: "Source Serif 4", Georgia, serif; font-size: clamp(28px, 4vw, 42px); font-weight: 500; line-height: 1.25; }
.viewer__meta, .viewer figcaption { color: var(--muted); font-size: 14px; line-height: 1.6; }
.viewer__actions { display: flex; flex-wrap: wrap; gap: 8px 28px; margin: 20px 0 28px; }
.viewer__actions a, .viewer__back { display: inline-flex; align-items: center; min-height: 44px; padding-block: 10px; font-size: 15px; text-underline-offset: 5px; }
.viewer figure { margin: 0; }
.viewer figure img { display: block; width: 100%; height: auto; background: white; }
.viewer figcaption { margin-top: 16px; }
.viewer__back { margin-top: 24px; }
@media (max-width: 640px) {
  .viewer { padding-top: 32px; }
  .viewer-masthead .library-masthead__inner { gap: 12px; }
  .viewer-masthead .resources-page__back { font-size: 13px; letter-spacing: 0; }
  .viewer-masthead .library-brand img { width: 86px; height: 44px; }
}