.page-news {
  --news-gap: 1.5rem;
  --news-index-width: 260px;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-dark);
  max-width: 100%;
  overflow-x: hidden;
}

/* 面包屑 */
.page-news__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  padding: 0.75rem 1rem;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.page-news__breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}
.page-news__breadcrumb a:hover {
  color: var(--primary);
}
.page-news__breadcrumb-sep {
  color: var(--text-secondary);
  opacity: 0.5;
}

/* 顶部视觉 */
.page-news__hero {
  position: relative;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto 1.5rem;
  overflow: hidden;
  aspect-ratio: 1440 / 300;
}
.page-news__hero-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}
.page-news__hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 1.5rem 2rem;
  background: linear-gradient(90deg, rgba(13,17,23,0.85) 0%, rgba(13,17,23,0.3) 70%, transparent 100%);
}
.page-news__hero-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin: 0 0 0.25rem;
  text-shadow: 0 2px 12px rgba(0,0,0,0.6);
}
.page-news__hero-sub {
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
  margin: 0;
  text-shadow: 0 1px 6px rgba(0,0,0,0.5);
}

/* 主布局：移动端单栏 */
.page-news__layout {
  display: flex;
  flex-direction: column;
  gap: var(--news-gap);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem 2rem;
  box-sizing: border-box;
  width: 100%;
}

/* 索引区 */
.page-news__index {
  flex-shrink: 0;
  width: 100%;
}
.page-news__section-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--secondary);
  margin: 1.5rem 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--secondary);
  display: inline-block;
}
.page-news__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-news__item {
  border-bottom: 1px solid rgba(255,255,255,0.06);
  margin: 0;
  padding: 0;
}
.page-news__link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  text-decoration: none;
  color: var(--text-primary);
  padding: 0.75rem 0.5rem;
  transition: background var(--transition), border-color var(--transition);
  border-left: 3px solid transparent;
}
.page-news__link:hover {
  background: rgba(0,212,255,0.06);
  border-left-color: var(--primary);
}
.page-news__num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  min-width: 2rem;
  letter-spacing: 0.02em;
}
.page-news__link-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  flex: 1 1 auto;
  min-width: 0;
}
.page-news__summary {
  width: 100%;
  margin-left: 3rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.4;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.35s ease, margin-top 0.35s ease;
  margin-top: 0;
}
.page-news__link:hover .page-news__summary {
  max-height: 60px;
  opacity: 1;
  margin-top: 0.25rem;
}

/* 文章区 */
.page-news__articles {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}
.page-news__article {
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding-bottom: 2rem;
  scroll-margin-top: calc(var(--header-height) + 1rem);
}
.page-news__article:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}
.page-news__article-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin: 0 0 0.75rem;
  line-height: 1.3;
}
.page-news__article-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  margin: 0 0 1rem;
  border: 1px solid rgba(255,255,255,0.06);
}
.page-news__article-text {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin: 0;
  max-width: 70ch;
}

/* 底部站内导航 */
.page-news__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.5rem;
  max-width: var(--max-width);
  margin: 2.5rem auto 0;
  padding: 1.5rem 1rem 2.5rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  width: 100%;
  box-sizing: border-box;
}
.page-news__nav-link {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}
.page-news__nav-link:hover {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* 桌面两栏布局 */
@media (min-width: 768px) {
  .page-news__breadcrumb {
    padding: 1rem 1.5rem;
  }
  .page-news__hero {
    margin-bottom: 2rem;
  }
  .page-news__hero-title {
    font-size: 2.75rem;
  }
  .page-news__hero-overlay {
    padding: 2rem 3rem;
  }
  .page-news__layout {
    flex-direction: row;
    align-items: flex-start;
    padding: 0 1.5rem 3rem;
    gap: 2rem;
  }
  .page-news__index {
    position: sticky;
    top: calc(var(--header-height) + 1rem);
    width: var(--news-index-width);
    flex-shrink: 0;
  }
  .page-news__section-title {
    font-size: 0.7rem;
    margin-top: 0.75rem;
  }
  .page-news__link {
    padding: 0.625rem 0.5rem;
  }
  .page-news__num {
    font-size: 0.9375rem;
    min-width: 1.75rem;
  }
  .page-news__link-title {
    font-size: 0.875rem;
  }
  .page-news__articles {
    gap: 3rem;
  }
  .page-news__article-title {
    font-size: 1.5rem;
  }
  .page-news__nav {
    margin-top: 3rem;
    padding: 2rem 1.5rem 3rem;
    gap: 1rem 2rem;
  }
}

@media (min-width: 1024px) {
  .page-news__breadcrumb {
    padding: 1rem 2rem;
  }
  .page-news__layout {
    padding: 0 2rem 3rem;
    gap: 3rem;
  }
  .page-news__index {
    width: 280px;
  }
  .page-news__hero-title {
    font-size: 3rem;
  }
  .page-news__article-title {
    font-size: 1.625rem;
  }
  .page-news__article-text {
    font-size: 1rem;
  }
  .page-news__nav {
    padding: 2.5rem 2rem 3.5rem;
  }
}

/* 限制最大宽度后居中 */
@media (min-width: 1300px) {
  .page-news__layout {
    padding-left: 0;
    padding-right: 0;
  }
  .page-news__breadcrumb {
    padding-left: 0;
    padding-right: 0;
  }
}