:root {
  --bg: #f4f5f7;
  --card-bg: #fff;
  --border: #e2e3e8;
  --accent: #0d6efd;
  --tag-bg: #eef4ff;
  --text: #1f2a37;
  --muted: #6b7280;
}

body {
  font-family: "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  margin: 0;
  color: var(--text);
  background: var(--bg);
}

.hero {
  padding: 2rem 1.5rem 1rem;
  text-align: center;
}

.hero h1 {
  margin: 0;
  font-size: 1.8rem;
}

.hero p {
  margin: 0.5rem 0 0;
  color: var(--muted);
}

.tag-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  padding: 0 1.5rem 1rem;
}

.tag-chip {
  border: 1px solid var(--border);
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--text);
  background: #fff;
  transition: background 0.15s ease, color 0.15s ease;
}

.tag-chip.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.cards-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  padding: 0 1.5rem 1rem;
  max-width: 1400px;
  margin: 0 auto;
}

.card {
  background: var(--card-bg);
  border-radius: 18px;
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  break-inside: avoid;  /* 防止在多列布局中被切断 */
  margin-bottom: 0;  /* 移除默认底部间距 */
}

.card h2 {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.4;
}

.card h2 a {
  text-decoration: none;
  color: var(--text);
}

.card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--muted);
}

.card img {
  width: 100%;
  height: auto;
  max-height: 360px;
  object-fit: cover;
  object-position: center;
  display: block;
}

.card-content {
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.meta {
  display: flex;
  align-items: baseline;  /* 使用基线对齐，确保文字在同一水平线 */
  justify-content: flex-end;  /* 右对齐 */
  gap: 0.35rem;
  font-size: 0.7rem;  /* 更小的字号 */
  color: var(--muted);
  opacity: 0.75;  /* 更灰 */
  line-height: 1;  /* 统一行高 */
}

.meta .date {
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;  /* 数字等宽 */
  line-height: 1;  /* 确保行高一致 */
}

.meta .count {
  flex-shrink: 0;
  white-space: nowrap;  /* 防止换行 */
  line-height: 1;  /* 确保行高一致 */
}

.meta .date::after {
  content: "·";
  margin: 0 0.25rem;  /* 左右间距更小 */
  opacity: 0.6;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.card-tags span {
  background: var(--tag-bg);
  color: var(--accent);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
}

.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 0 2rem;
}

.pagination a {
  min-width: 40px;
  text-align: center;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  font-size: 1.1rem;
  line-height: 1;
}

.pagination a.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.pagination a.disabled {
  color: var(--muted);
  border-color: var(--border);
  pointer-events: none;
}

/* 移动端优化：瀑布流双列展示 */
@media (max-width: 640px) {
  .hero {
    padding: 1.5rem 1rem 0.5rem;
  }

  .cards-grid {
    display: block;  /* 改为 block 以使用 columns */
    columns: 2;  /* 双列瀑布流 */
    column-gap: 0.75rem;
    padding: 0 0.75rem 1rem;
  }

  .card {
    border-radius: 12px;
    margin-bottom: 0.75rem;  /* 卡片之间的垂直间距 */
    display: inline-block;  /* 确保卡片不被列分割 */
    width: 100%;
  }

  .card img {
    max-height: 240px;
  }

  .card-content {
    padding: 0.6rem;
  }

  .card h2 {
    font-size: 0.95rem;
  }

  .card p {
    font-size: 0.85rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .meta {
    font-size: 0.65rem;  /* 移动端更小 */
    gap: 0.3rem;
  }

  .meta .date::after {
    margin: 0 0.2rem;
  }

  .card-tags span {
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
  }

  .pagination {
    gap: 0.35rem;
    padding: 1rem 0.75rem 2rem;
  }

  .pagination a {
    min-width: 32px;
    padding: 0.4rem 0.6rem;
    font-size: 0.95rem;
    border-radius: 8px;
  }
}

/* 平板：瀑布流布局 */
@media (min-width: 641px) and (max-width: 1023px) {
  .cards-grid {
    display: block;
    columns: 3;
    column-gap: 1rem;
    padding: 0 1rem 1rem;
  }

  .card {
    margin-bottom: 1rem;
    display: inline-block;
    width: 100%;
  }
}

/* 桌面：瀑布流 4 列布局 */
@media (min-width: 1024px) {
  .cards-grid {
    display: block;
    columns: 4;
    column-gap: 1.25rem;
    max-width: 1400px;
  }

  .card {
    margin-bottom: 1.25rem;
    display: inline-block;
    width: 100%;
  }
}