/* Knowledge Page */
#page-knowledge {
  background: var(--bg);
}

.kb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  background: var(--bg-card);
}

.kb-title {
  font-size: 22px;
  font-weight: 700;
}

.age-badge {
  padding: 5px 14px;
  border: 1.5px solid var(--primary);
  border-radius: 16px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
}

.category-wrap {
  background: var(--bg-card);
  padding: 0 16px 14px;
}

.category-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.cat-tag {
  padding: 6px 14px;
  border-radius: 14px;
  font-size: 13px;
  background: var(--tag-bg);
  color: var(--text-light);
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}

.cat-tag.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 500;
}

.kb-articles {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.kb-article-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.04);
  cursor: pointer;
  transition: transform 0.2s;
}

.kb-article-card:active {
  transform: scale(0.98);
}

.kb-article-body {
  flex: 1;
  margin-right: 12px;
}

.kb-article-cat {
  font-size: 11px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 5px;
}

.kb-article-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 6px;
}

.kb-article-footer {
  display: flex;
  align-items: center;
  font-size: 11px;
  color: var(--text-muted);
  gap: 4px;
}

.vip-badge {
  font-size: 10px;
  color: var(--vip-color);
  background: var(--vip-bg);
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 6px;
}

.kb-article-thumb {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.kb-empty {
  text-align: center;
  padding: 60px 0;
  color: var(--text-muted);
}

.kb-empty-icon {
  font-size: 40px;
  display: block;
  margin-bottom: 10px;
}

/* Desktop */
@media (min-width: 768px) {
  .kb-header {
    /* centered */
    padding: 20px 32px;
  }
  .kb-title {
    font-size: 26px;
  }
  .category-wrap {
    /* centered */
    padding: 0 32px 16px;
  }
  .category-row {
    gap: 10px;
  }
  .cat-tag {
    padding: 8px 18px;
    font-size: 14px;
  }
  .kb-articles {
    /* centered */
    padding: 16px 32px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  .kb-article-card {
    padding: 16px;
  }
  .kb-article-title {
    font-size: 16px;
  }
  .kb-article-thumb {
    width: 56px;
    height: 56px;
    font-size: 28px;
  }
}

@media (min-width: 1200px) {
  .kb-articles {
    grid-template-columns: repeat(3, 1fr);
  }
}