.authority-card {
  border-top: 4px solid var(--brand);
}

.authority-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .75rem;
  margin: 1rem 0;
}

.authority-fact {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: .85rem;
  background: var(--soft);
  padding: .8rem;
}

.authority-fact dt {
  margin: 0;
  color: #64748b;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.authority-fact dd {
  margin: .2rem 0 0;
  font-weight: 800;
  overflow-wrap: anywhere;
}

.authority-links {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  margin-top: 1rem;
}

.authority-sources {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: .85rem;
  padding: .75rem 1rem;
}

.authority-sources summary {
  cursor: pointer;
  font-weight: 800;
}

.authority-sources ol {
  margin-bottom: .2rem;
}

.difficulty {
  display: inline-flex;
  align-items: center;
  margin-left: .4rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: .08rem .45rem;
  font-size: .67rem;
  font-weight: 800;
  letter-spacing: .03em;
  vertical-align: middle;
  white-space: nowrap;
}

.difficulty-foundational { color: #075985; background: #e0f2fe; }
.difficulty-application { color: #5b21b6; background: #ede9fe; }
.difficulty-troubleshooting { color: #92400e; background: #fffbeb; }

.editorial-log time {
  font-weight: 800;
}

.dark .authority-fact,
.dark .authority-sources {
  background: #111827;
  border-color: #334155;
}

.dark .difficulty-foundational { color: #bae6fd; background: #0c4a6e; }
.dark .difficulty-application { color: #ddd6fe; background: #4c1d95; }
.dark .difficulty-troubleshooting { color: #fde68a; background: #78350f; }

@media (max-width: 760px) {
  .authority-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 420px) {
  .authority-grid { grid-template-columns: minmax(0, 1fr); }
  .difficulty { display: table; margin: .35rem 0 0; }
}

@media print {
  .authority-links { display: none; }
}