/* ===== 新闻中心 page-news 专属样式 ===== */
.page-news {
  --timeline-node-size: 20px;
  --timeline-line-width: 3px;
  --timeline-offset-desktop: 48px;
  --card-border-width: 2px;
  --card-tag-font: var(--font-headings);
  --color-tag-red: var(--color-primary-red);
  --color-tag-blue: var(--color-primary-blue);

  display: block;
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.6;
  background-color: var(--color-bg-dark);
}

/* 面包屑 */
.page-news .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.6rem;
  margin-bottom: 1.5rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}
.page-news .breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-speed) ease;
  font-weight: 500;
}
.page-news .breadcrumb a:hover,
.page-news .breadcrumb a:focus-visible {
  color: var(--color-accent-yellow);
  outline: none;
}
.page-news .breadcrumb-sep {
  user-select: none;
  color: var(--color-border);
}
.page-news .breadcrumb [aria-current="page"] {
  color: var(--color-accent-yellow);
  font-weight: 600;
}

/* 页面主标题 */
.page-news .page-title {
  margin: 0 0 0.25rem;
  font-family: var(--font-headings);
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  word-break: break-word;
}
.page-news .page-title-sub {
  display: block;
  margin-top: 0.2rem;
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--color-text-secondary);
  font-family: var(--font-body);
}

/* 板块标题 */
.page-news .section-title {
  position: relative;
  margin: 2.5rem 0 1.5rem;
  font-family: var(--font-headings);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-primary);
  padding-left: 1rem;
  border-left: 4px solid var(--color-primary-red);
}
.page-news .section-title-line {
  display: inline-block;
}

/* ========== 时间线容器 ========== */
.page-news .timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-left: calc(var(--timeline-node-size) + 1.2rem);
}

/* 时间线背景装饰图（桌面） */
.page-news .timeline-bg {
  display: none;
}

/* ========== 时间线条目 ========== */
.page-news .timeline-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding-bottom: 2rem;
  transition: transform var(--transition-speed) ease;
}
.page-news .timeline-item:last-child {
  padding-bottom: 0;
}

/* 时间线节点 —— 用伪元素画连接线 */
.page-news .timeline-node {
  position: absolute;
  left: calc(-1 * (var(--timeline-node-size) + 1.2rem) + 0.25rem);
  top: 0.35rem;
  width: var(--timeline-node-size);
  height: var(--timeline-node-size);
  border-radius: 50%;
  background-color: var(--color-primary-red);
  border: 3px solid var(--color-primary-blue);
  z-index: 2;
  flex-shrink: 0;
  transition: background-color var(--transition-speed) ease,
              transform var(--transition-speed) ease,
              box-shadow var(--transition-speed) ease;
}
.page-news .timeline-node::after {
  content: "";
  position: absolute;
  left: 50%;
  top: calc(var(--timeline-node-size) + 4px);
  width: var(--timeline-line-width);
  height: calc(100% + 2rem);
  transform: translateX(-50%);
  background: linear-gradient(to bottom, var(--color-primary-blue), var(--color-border));
  border-radius: 2px;
}
.page-news .timeline-item:last-child .timeline-node::after {
  display: none;
}

/* ========== 档案夹卡片 ========== */
.page-news .timeline-card {
  position: relative;
  flex: 1;
  min-width: 0;
  background-color: var(--color-surface-dark);
  border: var(--card-border-width) solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: 1.25rem 1.25rem 1rem;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-speed) ease,
              box-shadow var(--transition-speed) ease,
              transform var(--transition-speed) ease;
  /* 印刷边框叠加效果 */
  outline: 1px solid rgba(48, 54, 61, 0.35);
  outline-offset: 3px;
}
.page-news .timeline-card:hover,
.page-news .timeline-card:focus-within {
  border-color: var(--color-accent-yellow);
  box-shadow: 0 4px 20px rgba(244, 162, 97, 0.15);
  transform: translateY(-2px);
}

/* 档案夹标签（从卡片顶部伸出） */
.page-news .card-folder-tag {
  display: inline-block;
  position: relative;
  top: -1.45rem;
  left: -0.25rem;
  margin-bottom: -0.6rem;
  padding: 0.2rem 1rem 0.35rem;
  font-family: var(--card-tag-font);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  background-color: var(--color-tag-red);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  line-height: 1.3;
  transition: background-color var(--transition-speed) ease;
}
.page-news .card-folder-tag.tag-blue {
  background-color: var(--color-tag-blue);
}

/* 元数据行 */
.page-news .card-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1rem;
  margin-bottom: 0.5rem;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}
.page-news .card-date {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 500;
}
.page-news .card-date::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-primary-red);
}
.page-news .card-category {
  padding: 0.1rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}

/* 卡片标题 */
.page-news .card-heading {
  margin: 0 0 0.6rem;
  font-family: var(--font-headings);
  font-size: var(--font-size-lg);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  text-transform: uppercase;
  word-break: break-word;
}

/* 卡片配图 */
.page-news .card-visual {
  margin: 0.6rem 0 0.8rem;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  background-color: var(--color-bg-dark);
  border: 1px solid var(--color-border);
}
.page-news .card-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 200 / 150;
}

/* 摘要 */
.page-news .card-summary {
  margin: 0 0 0.6rem;
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  line-height: 1.55;
}

/* ========== 手风琴展开（details/summary） ========== */
.page-news .card-expand {
  margin-top: 0.25rem;
  border-top: 1px dashed var(--color-border);
  padding-top: 0.5rem;
}
.page-news .card-expand summary {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  list-style: none;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent-yellow);
  transition: color var(--transition-speed) ease;
  user-select: none;
}
.page-news .card-expand summary::-webkit-details-marker {
  display: none;
}
.page-news .card-expand summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.2rem;
  height: 1.2rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-accent-yellow);
  border: 1.5px solid var(--color-accent-yellow);
  border-radius: 50%;
  transition: transform var(--transition-speed) ease,
              background-color var(--transition-speed) ease;
  flex-shrink: 0;
}
.page-news .card-expand[open] summary::before {
  content: "−";
  background-color: var(--color-accent-yellow);
  color: var(--color-bg-dark);
}
.page-news .card-expand summary:hover,
.page-news .card-expand summary:focus-visible {
  color: #fff;
  outline: none;
}
.page-news .card-expand summary:hover::before,
.page-news .card-expand summary:focus-visible::before {
  border-color: #fff;
  color: #fff;
}
.page-news .card-expand[open] summary:hover::before,
.page-news .card-expand[open] summary:focus-visible::before {
  background-color: #fff;
  color: var(--color-bg-dark);
  border-color: #fff;
}
.page-news .expand-label {
  font-family: var(--font-body);
}
.page-news .expand-body {
  margin-top: 0.75rem;
  padding: 0.75rem 0 0.25rem;
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  line-height: 1.6;
  border-top: 1px solid var(--color-border);
}
.page-news .expand-body p {
  margin: 0 0 0.8rem;
  color: var(--color-text-secondary);
}
.page-news .expand-body .btn {
  margin-top: 0.3rem;
}

/* ========== 悬停联动：卡片悬停时节点高亮 ========== */
.page-news .timeline-item:hover .timeline-node,
.page-news .timeline-item:focus-within .timeline-node {
  background-color: var(--color-accent-yellow);
  transform: scale(1.25);
  box-shadow: 0 0 0 5px rgba(244, 162, 97, 0.25);
  border-color: var(--color-accent-yellow);
}

/* ========== 探索更多板块 ========== */
.page-news .explore-section {
  margin-top: 3.5rem;
  padding-top: 0.5rem;
  border-top: 2px solid var(--color-border);
}
.page-news .explore-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.25rem;
}
.page-news .explore-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.2rem;
  background-color: var(--color-surface-dark);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  text-decoration: none;
  color: var(--color-text-primary);
  transition: border-color var(--transition-speed) ease,
              background-color var(--transition-speed) ease,
              transform var(--transition-speed) ease;
  box-shadow: var(--shadow-card);
}
.page-news .explore-card:hover,
.page-news .explore-card:focus-visible {
  border-color: var(--color-accent-yellow);
  background-color: rgba(244, 162, 97, 0.06);
  transform: translateY(-2px);
  outline: none;
}
.page-news .explore-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2.4rem;
  height: 2.4rem;
  color: var(--color-primary-red);
  transition: color var(--transition-speed) ease;
}
.page-news .explore-card:hover .explore-card-icon,
.page-news .explore-card:focus-visible .explore-card-icon {
  color: var(--color-accent-yellow);
}
.page-news .explore-card-label {
  flex: 1;
  font-family: var(--font-headings);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-primary);
}
.page-news .explore-card-arrow {
  font-size: 1.3rem;
  color: var(--color-text-secondary);
  transition: transform var(--transition-speed) ease,
              color var(--transition-speed) ease;
}
.page-news .explore-card:hover .explore-card-arrow,
.page-news .explore-card:focus-visible .explore-card-arrow {
  transform: translateX(4px);
  color: var(--color-accent-yellow);
}

/* ========== 按钮覆盖（确保在卡片内也一致） ========== */
.page-news .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.25rem;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  transition: background-color var(--transition-speed) ease,
              border-color var(--transition-speed) ease,
              color var(--transition-speed) ease,
              box-shadow var(--transition-speed) ease;
  cursor: pointer;
  border: 1.5px solid transparent;
}
.page-news .btn-outline {
  background-color: transparent;
  color: var(--color-accent-yellow);
  border-color: var(--color-accent-yellow);
}
.page-news .btn-outline:hover,
.page-news .btn-outline:focus-visible {
  background-color: var(--color-accent-yellow);
  color: var(--color-bg-dark);
  box-shadow: 0 0 12px rgba(244, 162, 97, 0.3);
  outline: none;
}

/* ========== 响应式：移动端优先，桌面增强 ========== */
@media (min-width: 640px) {
  .page-news {
    padding: 2rem 1.5rem 4rem;
  }
  .page-news .page-title {
    font-size: calc(var(--font-size-4xl) * 1.15);
  }
  .page-news .page-title-sub {
    font-size: 1.1rem;
  }
  .page-news .section-title {
    font-size: var(--font-size-3xl);
    padding-left: 1.25rem;
    margin-top: 3rem;
  }
  .page-news .explore-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 768px) {
  .page-news {
    padding: 2.5rem 2rem 5rem;
  }
  /* 时间线左侧留白增加 */
  .page-news .timeline {
    padding-left: calc(var(--timeline-node-size) + 2rem);
  }
  .page-news .timeline-node {
    left: calc(-1 * (var(--timeline-node-size) + 2rem) + 0.25rem);
    width: 24px;
    height: 24px;
  }

  /* 桌面显示时间线背景装饰图 */
  .page-news .timeline-bg {
    display: block;
    position: absolute;
    left: -2.8rem;
    top: -0.5rem;
    width: 100px;
    height: 800px;
    object-fit: cover;
    object-position: center;
    opacity: 0.2;
    pointer-events: none;
    z-index: 0;
    border-radius: var(--border-radius-sm);
  }

  .page-news .timeline-card {
    padding: 1.5rem 1.75rem 1.25rem;
  }
  .page-news .card-heading {
    font-size: var(--font-size-xl);
  }
  .page-news .card-visual {
    max-width: 280px;
  }
  .page-news .card-folder-tag {
    top: -1.6rem;
    left: -0.35rem;
    padding: 0.25rem 1.2rem 0.4rem;
    font-size: 0.9rem;
  }
}

@media (min-width: 1024px) {
  .page-news .page-title {
    font-size: calc(var(--font-size-4xl) * 1.4);
  }
  .page-news .timeline {
    padding-left: calc(var(--timeline-node-size) + 3rem);
  }
  .page-news .timeline-node {
    left: calc(-1 * (var(--timeline-node-size) + 3rem) + 0.25rem);
    width: 26px;
    height: 26px;
  }
  .page-news .timeline-bg {
    left: -3.5rem;
    opacity: 0.25;
  }
  .page-news .timeline-item {
    padding-bottom: 2.5rem;
  }
  .page-news .card-heading {
    font-size: var(--font-size-2xl);
  }
  .page-news .explore-grid {
    gap: 1.25rem;
  }
}

/* 暗色滚动条微调（仅当前页面区域） */
.page-news ::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
.page-news ::-webkit-scrollbar-track {
  background: var(--color-bg-dark);
}
.page-news ::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}
.page-news ::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-secondary);
}