.page-news {
  --timeline-line: var(--color-accent);
  --timeline-glow: rgba(26, 92, 255, 0.25);
  --card-radius: 0.75rem;
  --card-bg: var(--glass);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-hover-border: var(--color-accent);
  --tag-bg: rgba(26, 92, 255, 0.12);
  --tag-color: var(--color-accent);
  --meta-color: var(--color-text-secondary);
  --deco-opacity: 0.15;
  position: relative;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-sm) var(--space-xl);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
}

/* ---- 背景 ---- */
.page-news__bg-wrap {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0.12;
}
.page-news__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* ---- 头部 ---- */
.page-news__header {
  position: relative;
  z-index: 1;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 2px solid var(--card-border);
}
.page-news__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}
.page-news__breadcrumb-link {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}
.page-news__breadcrumb-link:hover {
  color: var(--color-accent-highlight);
}
.page-news__breadcrumb-sep {
  color: var(--color-text-secondary);
}
.page-news__breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}
.page-news__title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 700;
  margin: 0 0 var(--space-xs);
  line-height: 1.1;
  text-shadow: 0 0 20px rgba(26, 92, 255, 0.4), 0 0 60px rgba(26, 92, 255, 0.15);
}
.page-news__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin: 0;
  letter-spacing: 0.02em;
}

/* ---- 时间线装饰 ---- */
.page-news__timeline-deco {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 120px;
  margin-bottom: var(--space-md);
  overflow: hidden;
  border-radius: var(--radius);
  opacity: var(--deco-opacity);
}
.page-news__deco-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
}

/* ---- 布局容器 ---- */
.page-news__layout {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* ---- 侧边导航 ---- */
.page-news__nav {
  position: relative;
  width: 100%;
  flex-shrink: 0;
}
.page-news__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  background: var(--glass);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  padding: var(--space-sm);
}
.page-news__nav-link {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius);
  transition: all 0.25s ease;
  white-space: nowrap;
}
.page-news__nav-link:hover,
.page-news__nav-link:focus-visible {
  color: var(--color-accent);
  background: rgba(26, 92, 255, 0.08);
  outline: none;
}
.page-news__nav-link:active {
  color: var(--color-accent-highlight);
}

/* ---- 内容区 ---- */
.page-news__content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* ---- 区块 ---- */
.page-news__section {
  scroll-margin-top: calc(var(--nav-height) + var(--space-md));
}
.page-news__section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  font-weight: 700;
  margin: 0 0 var(--space-xs);
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.page-news__section-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 1.2em;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-accent-secondary));
  border-radius: 2px;
  flex-shrink: 0;
}
.page-news__section-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-md);
  padding-left: calc(4px + var(--space-sm));
}

/* ---- 日志卡片 ---- */
.page-news__card {
  display: block;
  width: 100%;
  margin-bottom: var(--space-md);
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
}
.page-news__card:hover {
  border-color: var(--card-hover-border);
  box-shadow: 0 0 30px var(--timeline-glow);
}
.page-news__card--featured {
  border-left: 4px solid var(--color-accent);
  background: rgba(26, 92, 255, 0.04);
}
.page-news__card--featured .page-news__card-title {
  color: var(--color-accent);
}

/* summary 重置 */
.page-news__card summary {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  list-style: none;
  cursor: pointer;
  position: relative;
}
.page-news__card summary::-webkit-details-marker {
  display: none;
}
.page-news__card summary::marker {
  display: none;
  content: "";
}

/* 缩略图 */
.page-news__card-thumb {
  flex-shrink: 0;
  width: 72px;
  height: 72px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--card-border);
  background: var(--color-surface);
}
.page-news__card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 卡片主体 */
.page-news__card-body {
  flex: 1;
  min-width: 0;
}
.page-news__card-body--full {
  flex: 1 1 100%;
}
.page-news__card-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--tag-color);
  background: var(--tag-bg);
  padding: 2px 10px;
  border-radius: 20px;
  margin-bottom: var(--space-xs);
}
.page-news__tag-icon {
  width: 16px;
  height: 16px;
  object-fit: contain;
  border-radius: 0;
  display: inline-block;
}
.page-news__card-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 4px;
  line-height: 1.3;
  color: var(--color-text);
  transition: color 0.2s;
}
.page-news__card-excerpt {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.page-news__card-meta {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--meta-color);
  margin-top: var(--space-xs);
  letter-spacing: 0.02em;
}
.page-news__card-expand-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--color-accent);
  border: 1px solid var(--card-border);
  border-radius: 50%;
  transition: transform 0.3s ease, background 0.2s;
  margin-top: 4px;
}
.page-news__card[open] .page-news__card-expand-icon {
  transform: rotate(45deg);
  background: rgba(26, 92, 255, 0.1);
}

/* 详情展开区 */
.page-news__card-detail {
  padding: 0 var(--space-md) var(--space-md);
  border-top: 1px solid var(--card-border);
  animation: page-news-fade-in 0.3s ease;
}
.page-news__card-detail p {
  margin: var(--space-sm) 0;
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}
.page-news__detail-link {
  display: inline-block;
  margin-top: var(--space-xs);
  margin-right: var(--space-md);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}
.page-news__detail-link:hover {
  color: var(--color-accent-highlight);
}

@keyframes page-news-fade-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- 底部链接 ---- */
.page-news__footer-links {
  margin-top: var(--space-lg);
  padding-top: var(--space-lg);
  border-top: 2px solid var(--card-border);
}
.page-news__footer-links-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 var(--space-sm);
  color: var(--color-text-secondary);
}
.page-news__footer-links-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.page-news__footer-link {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  transition: all 0.25s ease;
  background: var(--glass);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.page-news__footer-link:hover {
  border-color: var(--color-accent);
  background: rgba(26, 92, 255, 0.08);
  box-shadow: 0 0 20px var(--timeline-glow);
}

/* ========== 响应式 ========== */
@media (min-width: 768px) {
  .page-news {
    padding: var(--space-lg) var(--space-md) var(--space-xl);
  }
  .page-news__timeline-deco {
    height: 200px;
    margin-bottom: var(--space-lg);
  }
  .page-news__layout {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-xl);
  }
  .page-news__nav {
    position: sticky;
    top: calc(var(--nav-height) + var(--space-md));
    width: 200px;
    flex-shrink: 0;
  }
  .page-news__nav-list {
    flex-direction: column;
    gap: var(--space-xs);
    padding: var(--space-sm);
    background: var(--glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }
  .page-news__nav-link {
    font-size: 0.9rem;
    padding: var(--space-xs) var(--space-sm);
  }
  .page-news__content {
    gap: var(--space-xl);
  }
  .page-news__card-thumb {
    width: 96px;
    height: 96px;
  }
  .page-news__card-title {
    font-size: 1.2rem;
  }
  .page-news__card-excerpt {
    font-size: 0.92rem;
  }
  .page-news__section-desc {
    font-size: 1rem;
  }
  .page-news__footer-links-group {
    gap: var(--space-md);
  }
}

@media (min-width: 1024px) {
  .page-news {
    padding: var(--space-xl) var(--space-lg);
  }
  .page-news__nav {
    width: 220px;
  }
  .page-news__nav-link {
    font-size: 0.95rem;
    padding: var(--space-sm);
  }
  .page-news__card summary {
    padding: var(--space-lg);
  }
  .page-news__card-detail {
    padding: 0 var(--space-lg) var(--space-lg);
  }
  .page-news__card-thumb {
    width: 120px;
    height: 120px;
  }
}

/* 窄屏安全 */
@media (max-width: 400px) {
  .page-news__card summary {
    flex-wrap: wrap;
    gap: var(--space-sm);
  }
  .page-news__card-thumb {
    width: 56px;
    height: 56px;
  }
  .page-news__card-expand-icon {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
  }
  .page-news__nav-list {
    gap: 4px;
  }
  .page-news__nav-link {
    font-size: 0.78rem;
    padding: 4px 10px;
  }
}