/* ===== Categories Page ===== */

/* 页面内容区域 */
.categories-content {
  margin-top: var(--spacing-lg);
}

/* ===== 分类头部（通用） ===== */
.category-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2.5rem;
  padding: 1.5rem 2rem;
  background: var(--card-background);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.category-info h2 {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-family: var(--font-secondary);
}

.category-info h2 i {
  color: var(--accent-color);
  font-size: 1.3rem;
}

.category-description {
  color: var(--secondary-color);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.category-description span {
  font-weight: 500;
  color: var(--accent-color);
}

.category-back a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: var(--accent-color);
  border-radius: var(--radius-md);
  color: white;
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.category-back a:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--accent-color) 35%, transparent);
}

/* ===== 分类云（跳转式布局） ===== */
.categories-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.categories-header h2 {
  font-family: var(--font-secondary);
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.categories-header h2 i {
  color: var(--accent-color);
}

.categories-header p {
  color: var(--secondary-color);
  font-size: 1rem;
}

.categories-cloud {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-top: var(--spacing-xl);
}

.category-cloud-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  background: var(--card-background);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(0, 0, 0, 0.04);
  text-decoration: none;
  color: var(--primary-color);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  min-height: 120px;
}

.category-cloud-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-color), color-mix(in srgb, var(--accent-color) 60%, transparent));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.category-cloud-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
  border-color: color-mix(in srgb, var(--accent-color) 20%, transparent);
}

.category-cloud-item:hover::before {
  opacity: 1;
}

.category-cloud-item--small {
  font-size: 0.9rem;
}

.category-cloud-item--medium {
  font-size: 1rem;
  padding: var(--spacing-md) var(--spacing-xl);
}

.category-cloud-item--large {
  font-size: 1.1rem;
  padding: var(--spacing-lg) var(--spacing-2xl);
}

.category-card-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.category-card-top i {
  font-size: 1.1rem;
  color: var(--accent-color);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--accent-color) 10%, transparent);
  border-radius: var(--radius-md);
}

.category-name {
  font-weight: 600;
  font-size: 1.05rem;
  line-height: 1.3;
}

.category-count {
  font-size: 0.8rem;
  color: var(--secondary-color);
  background: rgba(0, 0, 0, 0.03);
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
}

.category-card-arrow {
  margin-top: auto;
  padding-top: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--secondary-color);
}

.category-cloud-item:hover .category-card-arrow {
  color: var(--accent-color);
}

/* ===== 手风琴布局（展开式） ===== */
.categories-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
  box-sizing: border-box;
}

.category-section {
  background: var(--card-background);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  width: 100%;
  box-sizing: border-box;
  border: 1px solid rgba(0, 0, 0, 0.04);
  position: relative;
}

.category-section::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--accent-color), color-mix(in srgb, var(--accent-color) 40%, transparent));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.category-section:hover::before {
  opacity: 1;
}

.category-section.active {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border-color: color-mix(in srgb, var(--accent-color) 15%, transparent);
}

.category-section.active::before {
  opacity: 1;
}

.category-section--small {
  margin-bottom: var(--spacing-sm);
}

.category-section--medium {
  margin-bottom: var(--spacing-md);
}

.category-section--large {
  margin-bottom: var(--spacing-lg);
}

/* 手风琴模式下的分类头部覆盖样式 */
.categories-accordion .category-header {
  padding: 1.25rem 1.75rem;
  cursor: pointer;
  transition: background-color 0.25s ease;
  -webkit-user-select: none;
  user-select: none;
  position: relative;
  margin-bottom: 0;
}

.categories-accordion .category-header:hover {
  background-color: rgba(0, 0, 0, 0.02);
}

.categories-accordion .category-info h2 {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: 1.15rem;
  font-weight: 600;
}

.category-section--medium .category-info h2 {
  font-size: 1.25rem;
}

.category-section--large .category-info h2 {
  font-size: 1.35rem;
}

.categories-accordion .category-info h2 i {
  margin-right: var(--spacing-sm);
  font-size: 1rem;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--accent-color) 10%, transparent);
  border-radius: var(--radius-md);
}

.category-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.03);
  color: var(--secondary-color);
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  flex-shrink: 0;
}

.category-section.active .category-toggle {
  transform: rotate(180deg);
  background: color-mix(in srgb, var(--accent-color) 10%, transparent);
  color: var(--accent-color);
}

/* ===== 文章列表 ===== */
.category-posts {
  padding: 0 1.75rem 1.75rem;
  opacity: 1;
  transition: opacity 0.3s ease;
  width: 100%;
  box-sizing: border-box;
  flex-grow: 1;
}

.category-posts[style*="display: none"] {
  opacity: 0 !important;
}

.category-posts .post-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: var(--spacing-md);
}

.category-posts .post-item {
  background: var(--card-background);
  border-radius: var(--radius-md);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.category-posts .post-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
  border-color: color-mix(in srgb, var(--accent-color) 12%, transparent);
}

.category-posts .post-item-inner {
  padding: 1.25rem;
}

.category-posts .post-item-title a {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--primary-color);
  text-decoration: none;
  display: block;
  margin-bottom: 0.5rem;
  line-height: 1.4;
  transition: color 0.2s ease;
}

.category-posts .post-item-title a:hover {
  color: var(--accent-color);
}

.category-posts .post-item-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--secondary-color);
}

.category-posts .post-meta-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.category-posts .post-meta-left span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.category-posts .post-meta-left i {
  font-size: 0.75rem;
  opacity: 0.7;
}

.category-posts .read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.8rem;
  transition: all 0.25s ease;
}

.category-posts .read-more:hover {
  gap: 0.5rem;
}

/* ===== 空状态 ===== */
.no-categories, .no-posts {
  text-align: center;
}

.no-posts {
  padding: var(--spacing-xl);
  opacity: 1;
  transition: opacity 0.3s ease;
}

.no-posts[style*="display: none"] {
  opacity: 0 !important;
}

.no-posts .empty-state {
  padding: var(--spacing-lg);
}

.no-posts .empty-state i {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.4;
}

.no-posts .empty-state h3 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm);
  font-family: var(--font-secondary);
}

.no-posts .empty-state p {
  margin-bottom: var(--spacing-md);
  font-size: 0.9rem;
}

.no-categories {
  padding: var(--spacing-3xl);
}

.no-categories .empty-state i {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.4;
}

.no-categories .empty-state h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  font-family: var(--font-secondary);
}

.no-categories .empty-state p {
  margin-bottom: var(--spacing-lg);
}

.empty-state i {
  color: var(--secondary-color);
}

.empty-state p {
  color: var(--secondary-color);
}

.empty-state .button {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-xl);
  background: linear-gradient(135deg, var(--accent-color), color-mix(in srgb, var(--accent-color) 80%, #000));
  color: white;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px color-mix(in srgb, var(--accent-color) 25%, transparent);
}

.empty-state .button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--accent-color) 35%, transparent);
}

/* ===== 深色模式 ===== */
body.dark-mode .category-header,
body.dark-mode .category-cloud-item,
body.dark-mode .category-section {
  background: var(--card-background);
}

body.dark-mode .category-cloud-item {
  border-color: rgba(255, 255, 255, 0.06);
}

body.dark-mode .category-section {
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  border-color: rgba(255, 255, 255, 0.05);
}

body.dark-mode .category-section.active {
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  border-color: color-mix(in srgb, var(--accent-color) 20%, transparent);
}

body.dark-mode .category-name {
  color: var(--text-color);
}

body.dark-mode .category-back a:hover {
  color: var(--accent-color);
}

body.dark-mode .category-header:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

body.dark-mode .category-info h2 i {
  background: color-mix(in srgb, var(--accent-color) 15%, transparent);
}

body.dark-mode .category-card-top i {
  background: color-mix(in srgb, var(--accent-color) 15%, transparent);
}

body.dark-mode .category-count {
  background: rgba(255, 255, 255, 0.05);
}

body.dark-mode .category-toggle {
  background: rgba(255, 255, 255, 0.05);
}

body.dark-mode .category-section.active .category-toggle {
  background: color-mix(in srgb, var(--accent-color) 15%, transparent);
}

body.dark-mode .category-cloud-item:hover {
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

body.dark-mode .category-posts .post-item {
  border-color: rgba(255, 255, 255, 0.05);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

body.dark-mode .category-posts .post-item:hover {
  border-color: color-mix(in srgb, var(--accent-color) 18%, transparent);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .category-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem;
  }

  .categories-accordion .category-header {
    padding: 1rem 1.25rem;
  }

  .categories-cloud {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.875rem;
  }

  .category-cloud-item {
    padding: 1.25rem;
    min-height: 100px;
  }

  .category-posts .post-list {
    grid-template-columns: 1fr;
  }

  .categories-accordion .category-info h2,
  .category-section--medium .category-info h2,
  .category-section--large .category-info h2 {
    font-size: 1.1rem;
  }

  .category-posts {
    padding: 0 1.25rem 1.25rem;
  }

  .category-toggle {
    width: 32px;
    height: 32px;
  }
}

@media (max-width: 480px) {
  .categories-cloud {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .categories-cloud {
    grid-template-columns: repeat(3, 1fr);
  }

  .category-posts .post-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1025px) {
  .category-posts .post-list {
    grid-template-columns: repeat(3, 1fr);
  }
}