.spine-main {
  padding: 2rem 1rem 3rem;
}

.spine-page h1 {
  margin: 0 0 0.75rem;
  font-size: 1.75rem;
}

.spine-page .lead {
  color: var(--muted);
  line-height: 1.6;
  margin: 0 0 1.5rem;
}

.spine-breadcrumb {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.spine-breadcrumb a {
  color: var(--primary);
}

.spine-hub-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.5rem;
}

@media (min-width: 640px) {
  .spine-hub-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.spine-hub-list a,
.spine-hub-list .spine-hub-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--text, #0f172a);
  text-decoration: none;
}

.spine-hub-list a:hover,
.spine-hub-list .spine-hub-link:hover {
  border-color: var(--primary);
}

.spine-hub-link-label {
  flex: 1;
  min-width: 0;
}

.spine-badge {
  display: inline-block;
  flex-shrink: 0;
  margin-left: 0;
  padding: 0.1rem 0.45rem;
  font-size: 0.75rem;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  white-space: nowrap;
}

.btn.is-disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55;
  pointer-events: none;
  cursor: not-allowed;
}

.spine-hub-link-placeholder {
  opacity: 0.92;
}

.spine-audience,
.spine-steps,
.spine-outcome {
  margin: 0 0 1.5rem;
}

.spine-audience h2,
.spine-steps h2,
.spine-outcome h2,
.spine-example h2,
.spine-faq h2 {
  font-size: 1.15rem;
  margin: 0 0 0.65rem;
}

.spine-audience ul,
.spine-steps ol {
  margin: 0;
  padding-left: 1.25rem;
  line-height: 1.6;
}


.spine-index-section {
  margin-bottom: 2rem;
}

.spine-index-section h2 {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
}

.spine-index-subgroup {
  margin-bottom: 1.25rem;
}

.spine-index-subgroup h3 {
  font-size: 0.95rem;
  font-weight: 650;
  color: var(--muted, #64748b);
  margin: 0 0 0.5rem;
}

.spine-convert-section {
  margin-top: 1.75rem;
}

.spine-convert-section:first-of-type {
  margin-top: 0;
}

.spine-convert-section-title {
  font-size: 1.1rem;
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.spine-use-cases-section {
  margin-top: 1.75rem;
}

.spine-use-cases-section:first-of-type {
  margin-top: 0;
}

.spine-use-cases-section-title {
  font-size: 1.1rem;
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.spine-hub-link a {
  color: var(--primary);
}

.spine-planned-banner {
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  background: var(--card);
  margin-bottom: 1.5rem;
}

.spine-faq details {
  margin: 0.75rem 0;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--line);
}

.spine-faq summary {
  cursor: pointer;
  font-weight: 600;
}

.spine-related {
  margin-top: 2rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.spine-related a {
  color: var(--primary);
}

.tools-subnav-grouped .tools-subnav-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: flex-start;
}

.tools-subnav-group-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.tools-subnav-group-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
}

.tools-subnav-group-list a {
  font-size: 0.88rem;
  color: var(--primary);
  text-decoration: none;
}

.tools-subnav-all a {
  font-weight: 600;
  color: var(--primary);
}

.hero-cta {
  margin: 1.25rem 0 2rem;
}