/* ============================================================
   CiCC Theme 4.0 — Knowledge Hub Styles
   ============================================================ */

/* Knowledge Card */
.knowledge-card {
  position: relative;
  overflow: hidden;
}

.knowledge-card__icon {
  font-size: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 80px;
  margin: 0 auto;
}

.knowledge-card__abbr {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-family: var(--font-mono);
  background: rgba(124, 58, 237, 0.12);
  color: var(--cicc-purple);
}

/* Knowledge Link (auto-linked in posts) */
.knowledge-link {
  color: var(--cicc-purple);
  text-decoration: none;
  border-bottom: 1px dashed var(--cicc-purple);
  transition: all 0.15s;
  cursor: help;
}

.knowledge-link:hover {
  color: #fff;
  background: var(--cicc-purple);
  border-bottom-color: transparent;
  border-radius: 2px;
  padding: 0 2px;
}

/* Sidebar */
.knowledge-sidebar {
  position: sticky;
  top: 120px;
}

.knowledge-sidebar__section {
  margin-bottom: 24px;
}

.knowledge-sidebar__title {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--cicc-purple);
  color: var(--gray-800);
}

/* Difficulty badges */
.diff-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.6875rem;
  font-weight: 600;
}

.diff-badge--beginner {
  background: var(--cicc-green-100);
  color: var(--cicc-green);
}

.diff-badge--intermediate {
  background: var(--cicc-orange-100);
  color: var(--cicc-orange);
}

.diff-badge--advanced {
  background: var(--cicc-red-100);
  color: var(--cicc-red);
}

/* Knowledge Grid */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 1024px) {
  .knowledge-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .knowledge-grid { grid-template-columns: 1fr; }
}

/* Knowledge Hero gradient overlay */
.knowledge-hero {
  background: linear-gradient(135deg, #0f172a 0%, #3b0764 40%, #7c3aed 100%);
}