/* ===== 文章中心专属样式 .page-news ===== */
.page-news {
  --news-sidebar-width: 220px;
  --news-gap: 2rem;
  --card-radius: var(--radius-lg, 16px);
  --card-shadow: 0 4px 20px rgba(26, 26, 46, 0.08);
  --card-shadow-hover: 0 12px 36px rgba(26, 26, 46, 0.16);
  --sidebar-bg: color-mix(in srgb, var(--color-primary, #1A1A2E) 4%, transparent);
  --tag-bg: color-mix(in srgb, var(--color-secondary, #6A0DAD) 12%, transparent);
  --tag-color: var(--color-secondary, #6A0DAD);
  --marker-color: var(--color-accent, #FF6F00);
  display: block;
  width: 100%;
  max-width: var(--content-max-width, 1280px);
  margin: 0 auto;
  padding: 1rem 1.25rem 3rem;
  color: var(--color-text-dark, #0D0D0D);
  font-family: var(--font-body, 'Source Serif Pro', Georgia, serif);
}

/* 面包屑 */
.page-news .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.6rem;
  font-size: 0.8125rem;
  font-family: var(--font-heading, Inter, sans-serif);
  color: var(--color-text-light, #666);
  margin-bottom: 1.5rem;
  padding: 0;
  list-style: none;
}
.page-news .breadcrumb a {
  color: var(--color-secondary, #6A0DAD);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-base, 0.3s);
}
.page-news .breadcrumb a:hover,
.page-news .breadcrumb a:focus-visible {
  color: var(--color-accent, #FF6F00);
  outline: 2px solid var(--color-accent, #FF6F00);
  outline-offset: 2px;
  border-radius: 2px;
}
.page-news .breadcrumb .separator {
  color: var(--color-border, #ccc);
  user-select: none;
}
.page-news .breadcrumb [aria-current="page"] {
  color: var(--color-text-dark, #0D0D0D);
  font-weight: 600;
}

/* 页面标题组 */
.page-news .page-heading-group {
  margin-bottom: 2.25rem;
  border-left: 4px solid var(--color-accent, #FF6F00);
  padding-left: 1.25rem;
}
.page-news .page-title {
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.15;
  color: var(--color-primary, #1A1A2E);
  margin: 0 0 0.35rem;
}
.page-news .page-description {
  font-size: clamp(0.95rem, 1.4vw, 1.1rem);
  line-height: 1.6;
  color: var(--color-text-light, #555);
  margin: 0;
  max-width: 640px;
}

/* 两栏布局：移动端单列，桌面端侧栏+主区 */
.page-news .news-layout {
  display: flex;
  flex-direction: column;
  gap: var(--news-gap);
}

/* ===== 侧边栏 ===== */
.page-news .news-sidebar {
  order: -1;
  background: var(--sidebar-bg);
  border-radius: var(--card-radius);
  padding: 1.25rem 1rem;
  border: 1px solid color-mix(in srgb, var(--color-border, #ddd) 30%, transparent);
}
.page-news .sidebar-heading {
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-light, #777);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border, #ddd);
}
.page-news .sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.page-news .sidebar-link {
  display: block;
  padding: 0.65rem 1rem;
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary, #1A1A2E);
  text-decoration: none;
  border-radius: var(--radius-pill, 50px);
  transition: background var(--transition-base, 0.3s), color var(--transition-base, 0.3s), transform 0.2s;
  position: relative;
}
.page-news .sidebar-link:hover,
.page-news .sidebar-link:focus-visible {
  background: color-mix(in srgb, var(--color-secondary, #6A0DAD) 10%, transparent);
  color: var(--color-secondary, #6A0DAD);
  transform: translateX(4px);
  outline: none;
}
.page-news .sidebar-link:focus-visible {
  outline: 2px solid var(--color-secondary, #6A0DAD);
  outline-offset: 2px;
}
.page-news .sidebar-link[aria-selected="true"] {
  background: var(--color-secondary, #6A0DAD);
  color: #fff;
}
.page-news .sidebar-link[aria-selected="true"]:hover {
  background: color-mix(in srgb, var(--color-secondary, #6A0DAD) 85%, black);
  color: #fff;
  transform: translateX(0);
}

/* 分类section通过 :target 获得高亮边框 */
.page-news .category-section:target {
  animation: section-highlight 2s ease-out;
}
@keyframes section-highlight {
  0% {
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-accent, #FF6F00) 40%, transparent);
  }
  100% {
    box-shadow: 0 0 0 0 transparent;
  }
}

/* ===== 主内容区 ===== */
.page-news .news-main {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* ===== 分类区块 ===== */
.page-news .category-section {
  scroll-margin-top: 90px;
  padding: 0.25rem 0;
}
.page-news .category-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.6rem;
  border-bottom: 3px solid var(--color-border, #ddd);
}
.page-news .category-marker {
  font-size: 1.1rem;
  color: var(--marker-color);
  line-height: 1;
}
.page-news .category-title {
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: clamp(1.2rem, 2.2vw, 1.55rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-primary, #1A1A2E);
  margin: 0;
}
.page-news .category-count {
  font-size: 0.75rem;
  font-family: var(--font-heading, Inter, sans-serif);
  font-weight: 500;
  color: var(--color-text-light, #888);
  background: var(--sidebar-bg);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-pill, 50px);
  margin-left: auto;
  white-space: nowrap;
}

/* ===== 文章网格 ===== */
.page-news .article-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

/* ===== 卡片 ===== */
.page-news .card {
  background: #fff;
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  border: 1px solid color-mix(in srgb, var(--color-border, #ddd) 20%, transparent);
  overflow: hidden;
  transition: transform var(--transition-base, 0.3s), box-shadow var(--transition-base, 0.3s);
  display: flex;
  flex-direction: column;
}
.page-news .card:hover,
.page-news .card:focus-within {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
}
.page-news .card-image {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 400 / 250;
  object-fit: cover;
  max-width: 100%;
  border-bottom: 1px solid color-mix(in srgb, var(--color-border, #ddd) 15%, transparent);
}
.page-news .card-body {
  padding: 1rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex: 1;
}
.page-news .card-body--full {
  padding-top: 1.25rem;
}
.page-news .card-tag {
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--tag-color);
  background: var(--tag-bg);
  padding: 0.2rem 0.75rem;
  border-radius: var(--radius-pill, 50px);
  border: 1px solid color-mix(in srgb, var(--tag-color) 20%, transparent);
  transition: background var(--transition-base, 0.3s), color var(--transition-base, 0.3s);
  cursor: default;
}
.page-news .card:hover .card-tag {
  background: color-mix(in srgb, var(--color-secondary, #6A0DAD) 18%, transparent);
}
.page-news .card-title {
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary, #1A1A2E);
  margin: 0.2rem 0 0;
}
.page-news .card-summary {
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-text-light, #555);
  margin: 0;
  flex: 1;
}
.page-news .card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-heading, Inter, sans-serif);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-secondary, #6A0DAD);
  text-decoration: none;
  transition: color var(--transition-base, 0.3s), transform 0.2s;
  margin-top: 0.5rem;
  align-self: flex-start;
}
.page-news .card-link:hover,
.page-news .card-link:focus-visible {
  color: var(--color-accent, #FF6F00);
  transform: translateX(4px);
  outline: none;
}
.page-news .card-link:focus-visible {
  outline: 2px solid var(--color-accent, #FF6F00);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ===== 页脚注 ===== */
.page-news .news-footer-note {
  margin-top: 0.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--sidebar-bg);
  border-radius: var(--card-radius);
  border: 1px solid color-mix(in srgb, var(--color-border, #ddd) 20%, transparent);
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--color-text-light, #555);
}
.page-news .news-footer-note a {
  color: var(--color-secondary, #6A0DAD);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-base, 0.3s);
}
.page-news .news-footer-note a:hover,
.page-news .news-footer-note a:focus-visible {
  color: var(--color-accent, #FF6F00);
  outline: none;
}
.page-news .news-footer-note a:focus-visible {
  outline: 2px solid var(--color-accent, #FF6F00);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ===== 响应式：平板及以上 ===== */
@media (min-width: 640px) {
  .page-news {
    padding: 1.5rem 2rem 4rem;
  }
  .page-news .article-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-news .card-body {
    padding: 1rem 1.25rem 1.35rem;
  }
}

/* ===== 响应式：桌面 ===== */
@media (min-width: 960px) {
  .page-news {
    padding: 2rem 2.5rem 4.5rem;
  }
  .page-news .news-layout {
    flex-direction: row;
    align-items: flex-start;
  }
  .page-news .news-sidebar {
    order: 0;
    position: sticky;
    top: calc(var(--header-height, 80px) + 1.5rem);
    min-width: var(--news-sidebar-width);
    max-width: var(--news-sidebar-width);
    padding: 1.5rem 1.25rem;
  }
  .page-news .news-main {
    flex: 1;
    min-width: 0;
  }
  .page-news .article-grid {
    gap: 1.5rem;
  }
}

/* ===== 响应式：大桌面 ===== */
@media (min-width: 1200px) {
  .page-news {
    padding: 2.5rem 3rem 5rem;
  }
  .page-news .news-sidebar {
    min-width: 240px;
    max-width: 240px;
    padding: 1.75rem 1.5rem;
  }
  .page-news .article-grid {
    gap: 1.75rem;
  }
}