.page-news {
  --color-timeline-line: #2E8B57;
  --color-timeline-dot: #FFD700;
  --color-tag-update-bg: rgba(46, 139, 87, 0.12);
  --color-tag-update-text: #2E8B57;
  --color-tag-data-bg: rgba(255, 140, 0, 0.12);
  --color-tag-data-text: #CC7000;
  --color-tag-case-bg: rgba(124, 104, 238, 0.12);
  --color-tag-case-text: #5B4DBF;
  --color-card-shadow: rgba(0, 0, 0, 0.06);
  --timeline-decor-width: 100px;
  --filter-section-bg: #FFFFFF;
  display: block;
}

/* ===== 页面头部 ===== */
.page-news .page-header {
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-bg-white);
}

.page-news .page-header .breadcrumb {
  margin-bottom: var(--spacing-md);
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.page-news .page-header .breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.page-news .page-header .breadcrumb a:hover,
.page-news .page-header .breadcrumb a:focus-visible {
  color: var(--color-primary);
}

.page-news .page-header .breadcrumb-separator {
  margin: 0 var(--spacing-xs);
  color: var(--color-border-dark);
}

.page-news .page-header h1 {
  font-family: var(--font-heading);
  font-weight: 300;
  font-size: clamp(2rem, 5vw, 3.2rem);
  letter-spacing: 0.04em;
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-sm);
  line-height: 1.1;
}

.page-news .page-header .page-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 640px;
  line-height: 1.6;
  margin: 0;
}

/* ===== 筛选搜索区 ===== */
.page-news .filter-section {
  background: var(--filter-section-bg);
  border-bottom: 1px solid var(--color-border-light);
  padding: var(--spacing-lg) 0;
}

.page-news .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: flex-end;
}

.page-news .filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  min-width: 140px;
  flex: 1 1 140px;
}

.page-news .filter-label {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.page-news .filter-select {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  background: var(--color-bg-white);
  color: var(--color-text-primary);
  appearance: auto;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.page-news .filter-select:hover {
  border-color: var(--color-primary);
}

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

.page-news .filter-search {
  display: flex;
  gap: var(--spacing-sm);
  flex: 2 1 260px;
}

.page-news .filter-input {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  background: var(--color-bg-white);
  color: var(--color-text-primary);
  flex: 1;
  min-width: 0;
  transition: border-color var(--transition-fast);
}

.page-news .filter-input:hover {
  border-color: var(--color-primary);
}

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

.page-news .filter-btn {
  white-space: nowrap;
}

/* ===== 通用章节标题 ===== */
.page-news .section-heading {
  font-family: var(--font-heading);
  font-weight: 300;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  letter-spacing: 0.03em;
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-sm);
  line-height: 1.2;
}

.page-news .section-sub {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin: 0 0 var(--spacing-lg);
  max-width: 560px;
  line-height: 1.5;
}

/* ===== 时间线区域 ===== */
.page-news .timeline-section {
  padding: var(--spacing-xl) 0;
  background: var(--color-bg-light);
}

.page-news .timeline-section .section-heading {
  margin-bottom: var(--spacing-lg);
}

.page-news .timeline-layout {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* 时间线轨道 */
.page-news .timeline-track {
  display: flex;
  gap: var(--spacing-md);
  align-items: stretch;
  position: relative;
}

.page-news .timeline-decor {
  display: none;
  flex-shrink: 0;
  width: var(--timeline-decor-width);
  overflow: hidden;
  border-radius: var(--border-radius);
  background: var(--color-bg-white);
}

.page-news .timeline-decor-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  object-position: center;
}

.page-news .timeline-nodes {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  flex: 1;
  padding: var(--spacing-sm) 0;
}

.page-news .timeline-node {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.5rem 1rem 0.5rem 0.75rem;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: 100px;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.page-news .timeline-node:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.page-news .timeline-node:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.page-news .timeline-node[aria-selected="true"] {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-text-white);
  box-shadow: 0 2px 8px rgba(46, 139, 87, 0.25);
}

.page-news .timeline-node .node-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-timeline-dot);
  flex-shrink: 0;
  transition: background var(--transition-fast);
}

.page-news .timeline-node[aria-selected="true"] .node-dot {
  background: var(--color-text-white);
}

.page-news .timeline-node .node-label {
  white-space: nowrap;
}

/* 卡片网格 */
.page-news .timeline-cards {
  flex: 1;
  min-width: 0;
}

.page-news .card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

/* 更新卡片 */
.page-news .update-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

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

.page-news .update-card:focus-within {
  box-shadow: var(--shadow-md);
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.page-news .card-img-wrap {
  width: 100%;
  aspect-ratio: 400 / 250;
  overflow: hidden;
  background: var(--color-bg-light);
}

.page-news .card-img-wrap img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.page-news .update-card:hover .card-img-wrap img {
  transform: scale(1.03);
}

.page-news .card-body {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  flex: 1;
}

.page-news .card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.page-news .card-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  border-radius: 100px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.page-news .tag-update {
  background: var(--color-tag-update-bg);
  color: var(--color-tag-update-text);
}

.page-news .tag-data {
  background: var(--color-tag-data-bg);
  color: var(--color-tag-data-text);
}

.page-news .tag-case {
  background: var(--color-tag-case-bg);
  color: var(--color-tag-case-text);
}

.page-news .card-title {
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  margin: 0;
  line-height: 1.3;
}

.page-news .card-summary {
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ===== 历史交锋案例索引 ===== */
.page-news .history-index-section {
  padding: var(--spacing-xl) 0;
  background: var(--color-bg-white);
}

.page-news .index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

.page-news .index-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--color-bg-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.page-news .index-item:hover {
  box-shadow: var(--shadow-md);
}

.page-news .index-visual {
  width: 100%;
  aspect-ratio: 600 / 400;
  overflow: hidden;
  border-radius: var(--border-radius);
  background: var(--color-bg-white);
}

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

.page-news .index-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.page-news .index-content .index-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-primary);
  letter-spacing: 0.03em;
}

.page-news .index-content h3 {
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  margin: 0;
}

.page-news .index-content p {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}

.page-news .index-content .btn {
  align-self: flex-start;
  margin-top: var(--spacing-xs);
}

/* ===== 版本记录 ===== */
.page-news .version-section {
  padding: var(--spacing-xl) 0;
  background: var(--color-bg-light);
  border-top: 1px solid var(--color-border-light);
}

.page-news .version-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.page-news .version-item {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
  padding: var(--spacing-md);
  background: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.page-news .version-item:hover {
  box-shadow: var(--shadow-md);
}

.page-news .version-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  border-radius: var(--border-radius);
  overflow: hidden;
  background: var(--color-bg-light);
}

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

.page-news .icon-placeholder {
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  opacity: 0.15;
  border-radius: var(--border-radius);
}

.page-news .version-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.page-news .version-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.page-news .version-meta .index-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.03em;
}

.page-news .version-date {
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.page-news .version-content h3 {
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  margin: 0;
}

.page-news .version-content p {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ===== 页内链接导航 ===== */
.page-news .page-links {
  padding: var(--spacing-lg) 0 var(--spacing-xl);
  background: var(--color-bg-white);
  border-top: 1px solid var(--color-border-light);
}

.page-news .links-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
}

.page-news .links-bar .btn {
  min-width: 140px;
  text-align: center;
}

/* ===== 响应式：平板及以上 ===== */
@media (min-width: 640px) {
  .page-news .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-news .index-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-news .version-list {
    gap: var(--spacing-md);
  }

  .page-news .version-item {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .page-news .version-icon {
    width: 64px;
    height: 64px;
  }

  .page-news .filter-bar {
    flex-wrap: nowrap;
  }
}

/* ===== 响应式：桌面 ===== */
@media (min-width: 1024px) {
  .page-news .timeline-layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-news .timeline-track {
    flex-direction: column;
    width: 220px;
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--header-height, 64px) + var(--spacing-md));
  }

  .page-news .timeline-decor {
    display: block;
    height: 320px;
  }

  .page-news .timeline-nodes {
    flex-direction: column;
    padding: var(--spacing-sm) 0 0;
  }

  .page-news .timeline-node {
    border-radius: var(--border-radius);
    padding: 0.6rem 1rem;
    width: 100%;
  }

  .page-news .timeline-cards {
    flex: 1;
    min-width: 0;
  }

  .page-news .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-news .index-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-news .index-item {
    flex-direction: column;
  }

  .page-news .version-list {
    max-width: 720px;
  }

  .page-news .page-header h1 {
    font-size: 3rem;
  }

  .page-news .section-heading {
    font-size: 2rem;
  }
}

/* ===== 响应式：大屏 ===== */
@media (min-width: 1280px) {
  .page-news .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-news .timeline-track {
    width: 260px;
  }

  .page-news .timeline-decor {
    height: 400px;
  }
}