/* ============================================
   Posts 页面高级美化样式 - 25点优化
   目标：达到95分视觉效果
   ============================================ */

/* 导航栏层级修复 - 确保在最上层 */
.main-menu {
  position: relative;
  z-index: 1000 !important;
}

/* 1. 页面整体背景优化 */
.posts-page {
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
  min-height: 100vh;
}

/* 2. 页面标题区域美化 */
.posts-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 3rem 2rem;
  border-radius: 0 0 30px 30px;
  margin: 1rem 0 3rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.posts-header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 2px, transparent 2px);
  background-size: 40px 40px;
  animation: float 20s linear infinite;
}

@keyframes float {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(40px, 40px) rotate(360deg); }
}

.posts-header h1 {
  font-size: 3.5rem;
  font-weight: 800;
  color: white;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
  position: relative;
  z-index: 1;
}

.posts-header p {
  color: rgba(255,255,255,0.9);
  font-size: 1.2rem;
  max-width: 600px;
  margin: 1rem auto 0;
  position: relative;
  z-index: 1;
}

/* 3. 文章列表容器优化 */
.posts-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* 4. 年份标题美化 */
.posts-year-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: #667eea;
  margin: 3rem 0 2rem;
  padding-bottom: 1rem;
  border-bottom: 3px solid;
  border-image: linear-gradient(90deg, #667eea 0%, #764ba2 100%) 1;
  display: inline-block;
}

/* 5. 文章卡片网格布局 */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

/* 6. 文章卡片立体效果 */
.post-card {
  background: white;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,0.1);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  display: flex;
  flex-direction: column;
}

.post-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: 0 25px 60px rgba(0,0,0,0.2);
}

.post-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.post-card:hover::after {
  transform: scaleX(1);
}

/* 7. 文章封面图区域 */
.post-card-image {
  width: 100%;
  height: 200px;
  overflow: hidden;
  position: relative;
}

.post-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.post-card:hover .post-card-image img {
  transform: scale(1.1);
}

/* 8. 图片遮罩渐变 */
.post-card-image::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: linear-gradient(to top, rgba(0,0,0,0.4), transparent);
  pointer-events: none;
}

/* 9. 分类标签定位在图片上 */
.post-card-category {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  z-index: 2;
  box-shadow: 0 4px 15px rgba(102,126,234,0.4);
}

/* 10. 文章内容区域 */
.post-card-content {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* 11. 文章标题样式 */
.post-card-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 0.75rem;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-title a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s;
}

.post-card-title a:hover {
  color: #667eea;
}

/* 12. 文章摘要 */
.post-card-summary {
  color: #666;
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

/* 13. 元信息区域 */
.post-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  padding-top: 1rem;
  border-top: 1px solid #eee;
  font-size: 0.85rem;
  color: #888;
}

/* 14. 日期图标样式 */
.post-card-date {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.post-card-date::before {
  content: '📅';
  font-size: 0.9rem;
}

/* 15. 阅读时间样式 */
.post-card-reading-time::before {
  content: '⏱️';
  font-size: 0.9rem;
}

/* 16. 标签云样式 */
.post-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.post-card-tag {
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
  color: #667eea;
  padding: 0.3rem 0.8rem;
  border-radius: 15px;
  font-size: 0.75rem;
  font-weight: 600;
  transition: all 0.2s;
  border: 1px solid rgba(102,126,234,0.2);
}

.post-card-tag:hover {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  transform: scale(1.05);
}

/* 17. 分页美化 */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin: 4rem 0;
  padding: 2rem;
}

.pagination a,
.pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 45px;
  height: 45px;
  border-radius: 12px;
  font-weight: 600;
  transition: all 0.3s;
  text-decoration: none;
}

.pagination a {
  background: white;
  color: #667eea;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.pagination a:hover {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(102,126,234,0.4);
}

.pagination .current {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 4px 15px rgba(102,126,234,0.4);
}

.pagination .ellipsis {
  color: #999;
}

/* 18. 快速筛选栏 */
.posts-filter {
  background: white;
  padding: 1.5rem 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  margin-bottom: 3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.posts-filter-label {
  font-weight: 600;
  color: #333;
  margin-right: 1rem;
}

.posts-filter-btn {
  padding: 0.6rem 1.2rem;
  border-radius: 25px;
  border: 2px solid #e4e8ec;
  background: white;
  color: #666;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
}

.posts-filter-btn:hover,
.posts-filter-btn.active {
  border-color: #667eea;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

/* 19. 统计信息栏 */
.posts-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin: 3rem 0;
  padding: 2rem;
  background: white;
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.posts-stat {
  text-align: center;
}

.posts-stat-value {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.posts-stat-label {
  color: #666;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* 20. 加载动画 */
.posts-loading {
  display: flex;
  justify-content: center;
  padding: 3rem;
}

.posts-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid #e4e8ec;
  border-top-color: #667eea;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 21. 滚动显示动画 */
.post-card {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.6s ease forwards;
}

.post-card:nth-child(1) { animation-delay: 0s; }
.post-card:nth-child(2) { animation-delay: 0.1s; }
.post-card:nth-child(3) { animation-delay: 0.2s; }
.post-card:nth-child(4) { animation-delay: 0.3s; }
.post-card:nth-child(5) { animation-delay: 0.4s; }
.post-card:nth-child(6) { animation-delay: 0.5s; }

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 22. 响应式优化 */
@media (max-width: 768px) {
  .posts-grid {
    grid-template-columns: 1fr;
  }
  
  .posts-header h1 {
    font-size: 2rem;
  }
  
  .posts-stats {
    flex-direction: column;
    gap: 1.5rem;
  }
}

/* 23. 暗色模式适配 */
@media (prefers-color-scheme: dark) {
  .posts-page {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  }
  
  .post-card {
    background: rgba(30, 30, 50, 0.95);
  }
  
  .post-card-title {
    color: #e0e0e0;
  }
  
  .post-card-summary {
    color: #aaa;
  }
}

/* 24. 特色文章标记 */
.post-card.featured {
  border: 2px solid #667eea;
  position: relative;
}

.post-card.featured::before {
  content: '★ 精选';
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 15px;
  font-size: 0.75rem;
  font-weight: 700;
  z-index: 2;
}

/* 25. 空状态提示 */
.posts-empty {
  text-align: center;
  padding: 5rem 2rem;
  color: #666;
}

.posts-empty-icon {
  font-size: 5rem;
  margin-bottom: 1rem;
}

.posts-empty-text {
  font-size: 1.2rem;
}