.page-news {
  --hero-height: 280px;
  --timeline-dot-size: 14px;
  --timeline-line-width: 3px;
  --card-accent-width: 6px;

  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  padding: 0 1rem 3rem;
  color: var(--color-text-light);
  background: var(--color-bg);
  min-height: 60vh;
}

/* 面包屑 */
.page-news__breadcrumb {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: rgba(255 255 255 / 0.65);
}
.page-news__breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-news__breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
  transition: opacity var(--transition);
}
.page-news__breadcrumb a:hover {
  opacity: 0.8;
}

/* 首屏大标题区 */
.page-news__hero {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: var(--hero-height);
  text-align: center;
  background: linear-gradient(135deg, var(--color-dark) 0%, #0d0d1a 80%);
  border-radius: 12px;
  overflow: hidden;
  isolation: isolate;
  padding: 2.5rem 1.5rem;
}
.page-news__hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
  z-index: 0;
  pointer-events: none;
}
.page-news__hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 7vw, 4rem);
  margin: 0 0 0.5rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 2px;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 8px rgba(0 0 0 / 0.6);
}
.page-news__hero-sub {
  font-family: var(--font-body);
  font-size: clamp(1rem, 2.5vw, 1.4rem);
  color: var(--color-accent);
  margin: 0;
  position: relative;
  z-index: 1;
  font-weight: 500;
}

/* 分类索引 */
.page-news__category {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
}
.page-news__category-tags {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 0.75rem;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 4px;
}
.page-news__tag {
  flex-shrink: 0;
  padding: 0.5rem 1.25rem;
  border-radius: 40px;
  border: 2px solid var(--color-border);
  background: transparent;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-light);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.page-news__tag:hover,
.page-news__tag:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.page-news__tag--active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-dark);
}
.page-news__category-icons {
  display: none;
  gap: 0.5rem;
  margin-left: auto;
}
.page-news__cat-icon {
  width: 50px;
  height: 50px;
  object-fit: contain;
  border-radius: 8px;
  background: rgba(255 255 255 / 0.08);
  padding: 6px;
}

/* 时间线 */
.page-news__timeline {
  position: relative;
}
.page-news__timeline-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
  padding-left: 2rem;
}

/* 时间线虚线 */
.page-news__timeline-list::before {
  content: '';
  position: absolute;
  left: 13px;
  top: 0;
  bottom: 0;
  width: var(--timeline-line-width);
  background: repeating-linear-gradient(
    to bottom,
    var(--color-primary) 0,
    var(--color-primary) 8px,
    transparent 8px,
    transparent 16px
  );
  opacity: 0.35;
}

/* 单条入口 */
.page-news__entry {
  position: relative;
  display: flex;
  gap: 1rem;
}
.page-news__entry-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  width: 40px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}
.page-news__node-icon {
  width: var(--timeline-dot-size);
  height: var(--timeline-dot-size);
  object-fit: contain;
  filter: drop-shadow(0 0 6px var(--color-secondary));
}
.page-news__node-date {
  font-size: 0.65rem;
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  writing-mode: vertical-lr;
  letter-spacing: 2px;
  opacity: 0.7;
}

/* 文章卡片 */
.page-news__entry-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.25rem;
  background: var(--color-card-bg);
  backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.page-news__entry-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0 191 255 / 0.15);
}
.page-news__card-accent {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--card-accent-width);
  background: var(--color-secondary);
  border-radius: 0 4px 4px 0;
}
.page-news__card-accent--guide {
  background: var(--color-primary);
}
.page-news__card-accent--data {
  background: var(--color-accent);
}
.page-news__entry-card .card-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin: 0;
  color: var(--color-text-light);
}
.page-news__entry-card .card-body {
  font-size: 0.95rem;
  line-height: 1.6;
  color: rgba(255 255 255 / 0.85);
  margin: 0;
}
.page-news__entry-card .badge {
  align-self: flex-start;
  background: var(--color-dark);
  color: var(--color-accent);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  border: 1px solid var(--color-accent);
}
.page-news__entry-card .btn-ghost {
  align-self: flex-start;
  margin-top: auto;
  padding: 0.4rem 1rem;
  border: 2px solid var(--color-primary);
  background: transparent;
  color: var(--color-primary);
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  transition: all var(--transition);
}
.page-news__entry-card .btn-ghost:hover {
  background: var(--color-primary);
  color: var(--color-text-dark);
}

/* 推荐阅读 */
.page-news__featured-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--color-card-bg);
  backdrop-filter: blur(10px);
  border: 2px solid var(--color-border);
  border-radius: 16px;
}
.page-news__featured-media {
  overflow: hidden;
  border-radius: 12px;
  aspect-ratio: 3 / 2;
}
.page-news__featured-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.page-news__featured-card:hover .page-news__featured-img {
  transform: scale(1.03);
}
.page-news__featured-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-news__featured-content .badge {
  align-self: flex-start;
  background: var(--color-secondary);
  color: var(--color-text-light);
  padding: 0.3rem 1rem;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.8rem;
}
.page-news__featured-content .card-title {
  font-size: 1.5rem;
  color: var(--color-text-light);
  font-family: var(--font-heading);
  margin: 0;
}
.page-news__featured-content .card-body {
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255 255 255 / 0.85);
  margin: 0;
}
.page-news__featured-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.page-news__featured-links .btn-primary {
  padding: 0.6rem 1.75rem;
  background: var(--color-primary);
  color: var(--color-text-dark);
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
  transition: background var(--transition);
  border: none;
}
.page-news__featured-links .btn-secondary {
  padding: 0.6rem 1.75rem;
  background: var(--color-secondary);
  color: var(--color-text-light);
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
  transition: background var(--transition);
  border: none;
}
.page-news__featured-links .btn-primary:hover,
.page-news__featured-links .btn-secondary:hover {
  opacity: 0.9;
}

/* 桌面端 ≥768px */
@media (width >= 768px) {
  .page-news {
    padding: 0 2rem 4rem;
    gap: 3.5rem;
  }
  .page-news__category-icons {
    display: flex;
  }
  .page-news__timeline-list {
    padding-left: 3rem;
  }
  .page-news__timeline-list::before {
    left: 22px;
  }
  .page-news__entry-node {
    width: 50px;
  }
  .page-news__node-date {
    writing-mode: horizontal-tb;
    font-size: 0.75rem;
  }
  .page-news__entry-card {
    padding: 1.5rem;
  }
  .page-news__featured-card {
    flex-direction: row;
    align-items: flex-start;
  }
  .page-news__featured-media {
    flex: 1 1 45%;
    max-width: 500px;
    aspect-ratio: 3 / 2;
  }
  .page-news__featured-content {
    flex: 1 1 55%;
  }
  .page-news__featured-content .card-title {
    font-size: 1.75rem;
  }
}

/* 桌面大屏 ≥1024px */
@media (width >= 1024px) {
  .page-news {
    padding: 0 4rem 5rem;
    gap: 4rem;
  }
  .page-news__hero {
    min-height: 320px;
  }
  .page-news__timeline-list {
    max-width: 900px;
    margin: 0 auto;
  }
  .page-news__entry-card .card-title {
    font-size: 1.4rem;
  }
}