/* 高级 Posts 列表页面样式 */

.post-collections {
  max-width: 1400px;
  margin: 0 auto;
  padding: 5rem 2rem 6rem;
  position: relative;
}

/* 页面头部 */
.post-collections__header {
  margin-bottom: 4rem;
  position: relative;
}

.post-collections__header::after {
  content: '';
  position: absolute;
  bottom: -2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--color-accent-gradient);
  border-radius: 2px;
  opacity: 0.6;
}

.post-collections__header h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  margin-bottom: 1rem;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.03em;
}

.post-collections__header .subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  max-width: 700px;
  margin: 1rem auto 0;
  line-height: 1.8;
}

/* 网格布局 */
.post-collections__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

@media (min-width: 1200px) {
  .post-collections__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1600px) {
  .post-collections__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 高级卡片设计 */
.post-collections__column {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.post-collections__column::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-accent-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.post-collections__column:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-2xl), var(--shadow-colored);
  border-color: var(--color-accent);
}

.post-collections__column:hover::before {
  opacity: 1;
}

/* 卡片头部 */
.post-collections__column-head {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: flex-start;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.post-collections__column-head > div {
  flex: 1;
}

.post-collections__column-head .eyebrow {
  margin-bottom: 0.5rem;
  color: var(--color-accent);
  font-weight: 700;
}

.post-collections__column-head .subtitle {
  font-size: 0.95rem;
  margin: 0.5rem 0 0;
  text-align: left;
  max-width: none;
  line-height: 1.6;
}

.post-collections__column-head .btn {
  flex-shrink: 0;
  margin-top: 0.25rem;
}

/* 文章组 */
.post-group {
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
  margin-top: 1.5rem;
  transition: all 0.3s ease;
}

.post-group:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.post-group:hover {
  padding-left: 0.5rem;
}

.post-group__head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.post-group__title {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text);
  transition: all 0.3s ease;
  display: inline-block;
  position: relative;
}

.post-group__title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-gradient);
  transition: width 0.3s ease;
  border-radius: 1px;
}

.post-group__title:hover {
  color: var(--color-accent);
  transform: translateX(4px);
}

.post-group__title:hover::after {
  width: 100%;
}

.post-group__head p {
  margin: 0.5rem 0 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.post-group__count {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-subtle);
  background: var(--color-surface-muted);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  white-space: nowrap;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
}

/* 文章列表 */
.post-group__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.post-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.post-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--color-accent-gradient);
  border-radius: 0 2px 2px 0;
  transition: height 0.3s ease;
}

.post-link:hover {
  background: var(--color-surface-muted);
  padding-left: 1.25rem;
  transform: translateX(4px);
}

.post-link:hover::before {
  height: 60%;
}

.post-link a {
  color: var(--color-text);
  font-weight: 500;
  flex: 1;
  transition: color 0.2s ease;
  line-height: 1.5;
}

.post-link:hover a {
  color: var(--color-accent);
}

.post-link time {
  font-size: 0.85rem;
  color: var(--color-text-subtle);
  white-space: nowrap;
  font-weight: 500;
  opacity: 0.8;
}

.post-link:hover time {
  opacity: 1;
}

/* 空状态 */
.post-group--empty {
  border: none;
  padding: 2rem 1rem;
  margin: 0;
  text-align: center;
  color: var(--color-text-muted);
  font-style: italic;
  background: var(--color-surface-muted);
  border-radius: 12px;
}

/* 隐藏元素 */
[data-post-item][hidden] {
  display: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .post-collections {
    padding: 3rem 1.5rem 4rem;
  }

  .post-collections__header {
    margin-bottom: 3rem;
  }

  .post-collections__grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .post-collections__column {
    padding: 1.5rem;
    border-radius: 20px;
  }

  .post-collections__column-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .post-link {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .post-link time {
    font-size: 0.8rem;
    align-self: flex-end;
  }
}

@media (max-width: 480px) {
  .post-collections {
    padding: 2rem 1rem 3rem;
  }

  .post-collections__header h1 {
    font-size: 2rem;
  }

  .post-collections__column {
    padding: 1.25rem;
    border-radius: 16px;
  }
}

/* 加载动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.post-collections__column {
  animation: fadeInUp 0.6s ease-out backwards;
}

.post-collections__column:nth-child(1) { animation-delay: 0.1s; }
.post-collections__column:nth-child(2) { animation-delay: 0.2s; }
.post-collections__column:nth-child(3) { animation-delay: 0.3s; }
.post-collections__column:nth-child(4) { animation-delay: 0.4s; }
.post-collections__column:nth-child(5) { animation-delay: 0.5s; }
.post-collections__column:nth-child(6) { animation-delay: 0.6s; }