/* ============================================================
   文档中心 / 知识库样式
   ============================================================ */

.knowledge-header {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-xl);
  align-items: flex-start;
}

.knowledge-header p {
  color: var(--color-gray);
}

.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-xl);
}

.knowledge-card {
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(0, 92, 175, 0.1);
  box-shadow: 0 18px 38px rgba(9, 29, 61, 0.1);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-base);
}

.knowledge-card h3 {
  color: var(--color-primary);
  margin-bottom: 0;
}

.knowledge-card p {
  color: var(--color-gray);
  flex: 1;
}

.knowledge-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.knowledge-card li {
  margin-bottom: var(--spacing-sm);
  padding-left: 1.4rem;
  position: relative;
}

.knowledge-card li::before {
  content: '▹';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-secondary);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-xl);
}

.download-card {
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  background: linear-gradient(135deg, rgba(0, 92, 175, 0.1), rgba(77, 208, 225, 0.18));
  border: 1px solid rgba(0, 92, 175, 0.12);
  box-shadow: 0 18px 38px rgba(9, 29, 61, 0.12);
}

.download-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.download-meta {
  font-size: var(--font-size-sm);
  color: var(--color-gray);
  margin-bottom: var(--spacing-base);
}

.download-card .link-download {
  font-weight: var(--font-weight-semibold);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-xl);
}

.faq-item {
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(0, 92, 175, 0.1);
  box-shadow: 0 18px 38px rgba(9, 29, 61, 0.1);
}

.faq-item h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-base);
}

.faq-item p {
  color: var(--color-gray);
}

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