.protocol-opening {
  padding-top: 48px;
  padding-bottom: 32px;
}
.protocol-mast {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 48px;
  padding: 48px;
  border-radius: var(--r-block);
  background: var(--bg-panel-2);
  color: var(--on-dark-muted);
  box-shadow: var(--shadow-soft);
}
.protocol-heading h1 {
  margin-top: 24px;
  margin-bottom: 20px;
  color: var(--on-dark);
  font-size: var(--size-h1);
}
.protocol-heading p {
  max-width: 640px;
  line-height: var(--line-prose);
}
.protocol-heading p:last-child {
  margin-bottom: 0;
}
.protocol-heading a {
  color: var(--on-dark);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.protocol-heading a:hover {
  color: var(--accent);
}
.protocol-lead {
  color: var(--on-dark);
  font-weight: var(--weight-semibold);
}
.protocol-index {
  align-self: end;
  padding: 24px;
  border: 1px solid var(--line-on-dark-strong);
  border-radius: var(--r-card);
  background: var(--ink-card);
  color: var(--on-dark-muted);
}
.protocol-index .mono {
  overflow-wrap: anywhere;
  color: var(--accent);
  font-size: var(--size-caption);
}
.protocol-index strong {
  color: var(--on-dark);
}
.protocol-index .text-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--on-dark);
}
.protocol-index .text-link:hover {
  color: var(--accent);
}
.protocol-directory {
  padding-top: 0;
  padding-bottom: 24px;
}
.protocol-directory .toc {
  margin-bottom: 20px;
}
.protocol-directory .callout {
  margin-top: 0;
  margin-bottom: 0;
}
.protocol-directory .callout p {
  margin-bottom: 0;
}
#main-content > section[id] {
  scroll-margin-top: 24px;
}
#main-content > section[id] .sec-head {
  margin-bottom: 12px;
}
#main-content > section[id] .prose > h3:first-child {
  margin-top: 0;
}
@media (max-width: 1020px) {
  .protocol-mast {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding: 36px;
  }
  .protocol-index {
    max-width: 640px;
  }
}
@media (max-width: 640px) {
  .protocol-opening {
    padding-top: 24px;
  }
  .protocol-mast {
    gap: 24px;
    padding: 24px 20px;
  }
  .protocol-index {
    padding: 20px;
  }
  .protocol-directory {
    padding-bottom: 20px;
  }
}