/* ===== 页面作用域：.page-news ===== */

.page-news {
  --news-sidebar-width: 240px;
  --card-shadow-low: 0 1px 3px rgba(10, 43, 78, 0.06);
  --card-shadow-medium: 0 4px 12px rgba(10, 43, 78, 0.08);
  --card-shadow-high: 0 8px 24px rgba(10, 43, 78, 0.12);
  --card-shadow-featured: 0 12px 36px rgba(212, 175, 55, 0.14);
  --card-radius: 0px;
  --filter-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  background-color: var(--color-background-cream);
  padding-bottom: 3rem;
}

/* ---- 面包屑 ---- */
.page-news .breadcrumb {
  padding: 1rem 0 0.5rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-primary-medium);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
}

.page-news .breadcrumb a {
  color: var(--color-primary-dark);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-standard);
}

.page-news .breadcrumb a:hover,
.page-news .breadcrumb a:focus-visible {
  border-bottom-color: var(--color-accent-gold);
}

.page-news .breadcrumb-sep {
  color: var(--color-accent-gold);
  font-size: 0.75rem;
  margin: 0 0.125rem;
}

.page-news .breadcrumb-current {
  color: var(--color-text-dark);
  font-weight: 600;
}

/* ---- 页面头部 ---- */
.page-news .news-header {
  padding: 1.5rem 0 0.75rem;
}

.page-news .news-header .focus-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 700;
  color: var(--color-primary-dark);
  margin: 0 0 0.25rem;
  letter-spacing: 0.02em;
}

.page-news .news-header .focus-sub {
  font-family: var(--font-body);
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--color-primary-medium);
  margin: 0.25rem 0 0;
  line-height: 1.5;
}

.page-news .news-header .divider {
  display: block;
  height: 2px;
  width: 4rem;
  margin-top: 0.75rem;
  background-color: var(--color-accent-gold);
}

/* ---- 主体布局 (移动端：单列) ---- */
.page-news .news-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 1rem;
}

/* ---- 侧边筛选栏 (移动端：水平滚动) ---- */
.page-news .news-sidebar {
  flex-shrink: 0;
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.page-news .news-sidebar::-webkit-scrollbar {
  display: none;
}

.page-news .sidebar-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin: 0 0 0.625rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.page-news .filter-list {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0 0 0.25rem;
  min-width: max-content;
}

.page-news .filter-list li {
  margin: 0;
  padding: 0;
}

.page-news .filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary-medium);
  background: transparent;
  border: 1px solid var(--color-border-light);
  border-radius: var(--card-radius);
  cursor: pointer;
  transition: all var(--transition-standard);
  white-space: nowrap;
  line-height: 1.3;
}

.page-news .filter-btn:hover {
  border-color: var(--color-accent-gold);
  color: var(--color-primary-dark);
}

.page-news .filter-btn.active {
  background: var(--color-primary-dark);
  color: var(--color-text-light);
  border-color: var(--color-primary-dark);
  box-shadow: var(--card-shadow-medium);
}

.page-news .filter-btn:focus-visible {
  outline: 2px solid var(--color-accent-gold);
  outline-offset: 2px;
}

/* ---- 彩色圆点 ---- */
.page-news .dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.page-news .dot-gold { background-color: var(--color-accent-gold); }
.page-news .dot-red { background-color: var(--color-highlight-red); }
.page-news .dot-blue { background-color: var(--color-primary-light); }
.page-news .dot-dark { background-color: var(--color-primary-medium); }

/* ---- 内容区 ---- */
.page-news .news-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ---- 置顶文章 ---- */
.page-news .featured-article {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--color-border-gold);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow-featured);
  overflow: hidden;
  transition: box-shadow var(--transition-standard);
}

.page-news .featured-article:hover {
  box-shadow: 0 16px 40px rgba(212, 175, 55, 0.18);
}

.page-news .featured-image-wrap {
  width: 100%;
  max-height: 240px;
  overflow: hidden;
  background: var(--color-primary-dark);
}

.page-news .featured-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-news .featured-body {
  padding: 1.25rem 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-news .featured-title {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 3vw, 1.65rem);
  font-weight: 700;
  color: var(--color-primary-dark);
  margin: 0;
  line-height: 1.3;
}

.page-news .featured-summary {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text-dark);
  line-height: 1.6;
  margin: 0;
}

.page-news .featured-summary a {
  color: var(--color-primary-medium);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--color-accent-gold);
}

.page-news .featured-summary a:hover {
  color: var(--color-accent-gold);
}

.page-news .featured-extra {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.35s ease, margin 0.3s ease;
  margin: 0;
}

.page-news .featured-extra[aria-hidden="false"] {
  max-height: 300px;
  opacity: 1;
  margin-top: 0.5rem;
}

.page-news .featured-extra p {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-text-dark);
  line-height: 1.6;
  margin: 0;
  padding: 0.75rem 0 0;
  border-top: 1px solid var(--color-border-light);
}

/* ---- 文章网格 (移动端单列) ---- */
.page-news .article-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ---- 文章卡片 ---- */
.page-news .article-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow-low);
  overflow: hidden;
  transition: box-shadow var(--transition-standard), transform var(--transition-standard);
}

.page-news .article-card:hover {
  box-shadow: var(--card-shadow-medium);
  transform: translateY(-2px);
}

.page-news .article-card[data-importance="high"] {
  box-shadow: var(--card-shadow-high);
}

.page-news .article-card[data-importance="high"]:hover {
  box-shadow: 0 12px 32px rgba(10, 43, 78, 0.15);
}

.page-news .card-image {
  width: 100%;
  max-height: 180px;
  overflow: hidden;
  background: var(--color-primary-dark);
}

.page-news .card-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-news .card-body {
  padding: 1rem 1rem 1.125rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  flex: 1;
}

.page-news .card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.page-news .card-tags .tag {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  font-family: var(--font-heading);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-primary-medium);
  background: var(--color-background-cream);
  border: 1px solid var(--color-border-light);
  border-radius: var(--card-radius);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.page-news .card-tags .tag-gold {
  color: var(--color-accent-gold);
  border-color: var(--color-border-gold);
  background: rgba(212, 175, 55, 0.06);
}

.page-news .card-title {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 700;
  color: var(--color-primary-dark);
  margin: 0;
  line-height: 1.3;
}

.page-news .card-summary {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-text-dark);
  line-height: 1.55;
  margin: 0;
  flex: 1;
}

.page-news .card-extra {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.38s ease, opacity 0.3s ease, margin 0.25s ease;
  margin: 0;
}

.page-news .card-extra[aria-hidden="false"] {
  max-height: 260px;
  opacity: 1;
  margin-top: 0.375rem;
}

.page-news .card-extra p {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-text-dark);
  line-height: 1.6;
  margin: 0;
  padding: 0.5rem 0 0;
  border-top: 1px solid var(--color-border-light);
}

.page-news .card-extra a {
  color: var(--color-primary-medium);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--color-accent-gold);
}

.page-news .card-extra a:hover {
  color: var(--color-accent-gold);
}

/* ---- 阅读全文按钮 ---- */
.page-news .card-toggle {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 0.375rem 0.875rem;
  margin-top: 0.25rem;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primary-medium);
  background: transparent;
  border: 1px solid var(--color-border-light);
  border-radius: var(--card-radius);
  cursor: pointer;
  transition: all var(--transition-standard);
  line-height: 1.4;
}

.page-news .card-toggle:hover,
.page-news .card-toggle:focus-visible {
  border-color: var(--color-accent-gold);
  color: var(--color-primary-dark);
  background: rgba(212, 175, 55, 0.05);
}

.page-news .card-toggle:focus-visible {
  outline: 2px solid var(--color-accent-gold);
  outline-offset: 2px;
}

.page-news .card-toggle[aria-expanded="true"] {
  color: var(--color-accent-gold);
  border-color: var(--color-accent-gold);
  background: rgba(212, 175, 55, 0.08);
}

/* ---- 筛选状态 (JS驱动) ---- */
.page-news .article-card,
.page-news .featured-article {
  transition: opacity 0.35s ease, transform 0.35s ease;
}

/* ===== 桌面端 (min-width: 768px) ===== */
@media (min-width: 768px) {
  .page-news .news-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 2rem;
  }

  .page-news .news-sidebar {
    width: var(--news-sidebar-width);
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--header-height) + 1rem);
    overflow: visible;
  }

  .page-news .sidebar-title {
    font-size: 1.05rem;
    margin-bottom: 0.875rem;
  }

  .page-news .filter-list {
    flex-direction: column;
    gap: 0.375rem;
    min-width: unset;
  }

  .page-news .filter-btn {
    width: 100%;
    justify-content: flex-start;
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    white-space: normal;
  }

  .page-news .filter-btn.active {
    background: var(--color-primary-dark);
    color: var(--color-text-light);
  }

  .page-news .news-content {
    gap: 2rem;
  }

  .page-news .featured-image-wrap {
    max-height: 320px;
  }

  .page-news .featured-body {
    padding: 1.5rem 2rem 2rem;
  }

  .page-news .article-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .page-news .article-card.card-wide {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
  }

  .page-news .card-wide .card-image {
    max-height: 100%;
    height: 100%;
  }

  .page-news .card-wide .card-image img {
    height: 100%;
    object-fit: cover;
  }

  .page-news .card-wide .card-body {
    padding: 1.25rem 1.5rem;
  }

  .page-news .card-image {
    max-height: 200px;
  }

  .page-news .card-body {
    padding: 1.125rem 1.25rem 1.25rem;
  }
}

/* ===== 宽屏 (min-width: 1024px) ===== */
@media (min-width: 1024px) {
  .page-news .news-layout {
    gap: 2.5rem;
  }

  .page-news .news-sidebar {
    width: 260px;
  }

  .page-news .filter-btn {
    padding: 0.55rem 1rem;
    font-size: 0.9rem;
  }

  .page-news .featured-image-wrap {
    max-height: 380px;
  }

  .page-news .featured-body {
    padding: 2rem 2.5rem 2.25rem;
  }

  .page-news .article-grid {
    gap: 1.75rem;
  }

  .page-news .card-body {
    padding: 1.25rem 1.5rem 1.5rem;
  }

  .page-news .card-title {
    font-size: 1.15rem;
  }
}

/* ===== 大屏 (min-width: 1280px) ===== */
@media (min-width: 1280px) {
  .page-news .news-sidebar {
    width: 280px;
  }

  .page-news .featured-image-wrap {
    max-height: 420px;
  }
}

/* ---- 确保容器内图片响应式 ---- */
.page-news img {
  max-width: 100%;
  height: auto;
}

/* ---- 可访问性：聚焦样式 ---- */
.page-news .filter-btn:focus-visible,
.page-news .card-toggle:focus-visible {
  outline: 2px solid var(--color-accent-gold);
  outline-offset: 2px;
}

/* ---- 筛选动画平滑 ---- */
.page-news .filter-btn {
  transition: background var(--filter-transition), color var(--filter-transition), border-color var(--filter-transition), box-shadow var(--filter-transition);
}

/* ---- 卡片阴影随重要性变化 ---- */
.page-news .article-card[data-importance="low"] {
  box-shadow: var(--card-shadow-low);
}

.page-news .article-card[data-importance="medium"] {
  box-shadow: var(--card-shadow-medium);
}

.page-news .article-card[data-importance="high"] {
  box-shadow: var(--card-shadow-high);
}

/* ---- 阅读全文展开状态底部微调 ---- */
.page-news .card-toggle[aria-expanded="true"] + .card-extra[aria-hidden="false"] {
  margin-top: 0.5rem;
}