/* 首页右侧分类筛选框 */
#category-filter {
  background: var(--board-bg-color);
  color: var(--text-color);
  border: 1px solid var(--line-color);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: background 0.2s ease-in-out;
}

.category-filter-title {
  font-size: 0.9rem;
  font-weight: bold;
  color: var(--sec-text-color);
  margin-bottom: 0.5rem;
}

.category-filter-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.category-filter-item {
  border: 1px solid var(--line-color);
  border-radius: 1rem;
  background: transparent;
  color: var(--text-color);
  font-size: 0.8125rem;
  line-height: 1.6;
  padding: 0.1rem 0.65rem;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.category-filter-item:hover {
  background: var(--button-hover-bg-color);
}

.category-filter-item.active {
  background: var(--navbar-bg-color);
  border-color: var(--navbar-bg-color);
  color: var(--navbar-text-color);
}

/* 宽屏：悬浮在页面右侧 */
@media (min-width: 1300px) {
  #category-filter {
    position: fixed;
    top: 45%;
    right: 1rem;
    transform: translateY(-50%);
    width: 11rem;
    z-index: 10;
  }
  .category-filter-items {
    flex-direction: column;
    align-items: stretch;
  }
  .category-filter-item {
    text-align: left;
  }
}

/* 窄屏：置于文章列表顶部 */
@media (max-width: 1299.98px) {
  #category-filter {
    margin: 0 auto 1rem;
  }
}