.page-news {
  --news-gold: #D4AF37;
  --news-gold-dim: rgba(212, 175, 55, 0.15);
  --news-card-bg: #142A44;
  --news-border: #2C4058;
  --news-text: #E8ECF1;
  --news-text-secondary: #A0B0C0;
  --news-hover: #3B5E7A;
  --news-bg: #0B1A2C;
  --news-radius: 6px;
  --news-transition: 0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
  --news-index-width: 80px;
  display: block;
  width: 100%;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  color: var(--news-text);
  font-family: var(--font-primary, 'Inter', 'Helvetica Neue', sans-serif);
  position: relative;
}

/* 面包屑 */
.page-news__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--news-text-secondary);
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}
.page-news__breadcrumb a {
  color: var(--news-text-secondary);
  text-decoration: none;
  transition: color var(--news-transition);
}
.page-news__breadcrumb a:hover,
.page-news__breadcrumb a:focus-visible {
  color: var(--news-gold);
  outline: none;
}
.page-news__breadcrumb-sep {
  color: var(--news-border);
  font-size: 0.75rem;
}
.page-news__breadcrumb [aria-current="page"] {
  color: var(--news-gold);
  font-weight: 500;
}

/* 头部 */
.page-news__header {
  margin-bottom: 2.5rem;
  border-left: 3px solid var(--news-gold);
  padding-left: 1.25rem;
}
.page-news__title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 0.5rem;
  color: var(--news-text);
}
.page-news__subtitle {
  font-size: 1rem;
  font-weight: 300;
  color: var(--news-text-secondary);
  margin: 0;
  max-width: 36em;
}

/* 布局：索引 + 章节 */
.page-news__layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
}

/* 坐标索引（移动端水平） */
.page-news__index {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--news-card-bg);
  border-radius: var(--news-radius);
  border: 1px solid var(--news-border);
  position: relative;
}
.page-news__index-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--news-gold);
  margin-right: 0.25rem;
}
.page-news__index-item {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  text-decoration: none;
  color: var(--news-text-secondary);
  font-size: 0.8125rem;
  font-weight: 400;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background var(--news-transition), color var(--news-transition);
}
.page-news__index-item:hover,
.page-news__index-item:focus-visible {
  background: var(--news-gold-dim);
  color: var(--news-gold);
  outline: none;
}
.page-news__index-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--news-border);
  flex-shrink: 0;
  transition: background var(--news-transition);
}
.page-news__index-item:hover .page-news__index-dot,
.page-news__index-item:focus-visible .page-news__index-dot {
  background: var(--news-gold);
}
.page-news__index-num {
  font-family: var(--font-mono, monospace);
  font-size: 0.75rem;
  color: var(--news-gold);
  font-weight: 600;
}
.page-news__index-text {
  display: none;
}
.page-news__index-line {
  display: none;
}

/* 章节容器 */
.page-news__sections {
  flex: 1;
  min-width: 0;
}

/* 每个章节 */
.page-news__section {
  margin-bottom: 3.5rem;
  padding-top: 0.5rem;
  scroll-margin-top: 1.5rem;
}
.page-news__section:last-child {
  margin-bottom: 0;
}
.page-news__section-top {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}
.page-news__section-icon {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: 50%;
  background: var(--news-gold-dim);
  padding: 0.5rem;
  flex-shrink: 0;
  align-self: flex-start;
}
.page-news__section-pic {
  width: 100%;
  max-width: 500px;
  height: auto;
  object-fit: cover;
  border-radius: var(--news-radius);
  border: 1px solid var(--news-border);
  flex-shrink: 0;
  order: 2;
}
.page-news__section-pic--slim {
  max-width: 300px;
}
.page-news__section-heading-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
  min-width: 160px;
}
.page-news__section-num {
  font-family: var(--font-mono, monospace);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--news-gold);
  letter-spacing: 0.05em;
  display: block;
}
.page-news__section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin: 0;
  color: var(--news-text);
}
.page-news__section-desc {
  font-size: 0.9375rem;
  font-weight: 300;
  color: var(--news-text-secondary);
  margin: 0.5rem 0 1.5rem;
  max-width: 32em;
}

/* 卡片网格 */
.page-news__card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.page-news__card-grid--wide {
  grid-template-columns: 1fr;
}

/* 卡片 */
.page-news__card {
  background: var(--news-card-bg);
  border: 1px solid var(--news-border);
  border-radius: var(--news-radius);
  padding: 1.5rem;
  transition: transform var(--news-transition), box-shadow var(--news-transition), border-color var(--news-transition);
  cursor: default;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}
.page-news__card:hover,
.page-news__card:focus-within {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  border-color: var(--news-gold);
}
.page-news__card--large {
  padding: 1.75rem;
}
.page-news__tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.7rem;
  border-radius: 3px;
  background: var(--news-gold-dim);
  color: var(--news-gold);
  align-self: flex-start;
  margin-bottom: 0.25rem;
}
.tag-fix {
  background: rgba(212, 175, 55, 0.12);
  color: #D4AF37;
}
.tag-opt {
  background: rgba(160, 176, 192, 0.15);
  color: #A0B0C0;
}
.tag-known {
  background: rgba(212, 175, 55, 0.08);
  color: #c9a82e;
}
.tag-change {
  background: rgba(212, 175, 55, 0.18);
  color: #e0c04a;
}
.tag-reorg {
  background: rgba(160, 176, 192, 0.2);
  color: #b8c8d8;
}
.tag-info {
  background: rgba(212, 175, 55, 0.1);
  color: #d4b84a;
}
.tag-path {
  background: rgba(212, 175, 55, 0.14);
  color: #dcc04e;
}
.page-news__card-title {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 0;
  color: var(--news-text);
}
.page-news__card-text {
  font-size: 0.9375rem;
  font-weight: 300;
  color: var(--news-text-secondary);
  margin: 0;
  line-height: 1.5;
}
.page-news__card-detail {
  font-size: 0.8125rem;
  font-weight: 300;
  color: var(--news-text-secondary);
  margin: 0.25rem 0 0;
  line-height: 1.5;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.3s ease, margin 0.3s ease;
  opacity: 0;
}
.page-news__card:hover .page-news__card-detail,
.page-news__card:focus-within .page-news__card-detail {
  max-height: 6rem;
  opacity: 1;
  margin-top: 0.5rem;
}

/* 相关链接 */
.page-news__related {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--news-border);
  font-size: 0.875rem;
  color: var(--news-text-secondary);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.6rem;
}
.page-news__related-label {
  font-weight: 400;
  color: var(--news-text-secondary);
}
.page-news__related-link {
  color: var(--news-gold);
  text-decoration: none;
  transition: color var(--news-transition);
}
.page-news__related-link:hover,
.page-news__related-link:focus-visible {
  color: #e8c857;
  outline: none;
  text-decoration: underline;
}
.page-news__related-sep {
  color: var(--news-border);
  font-size: 0.75rem;
}

/* 粒子背景装饰 */
.page-news__particle {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 40%;
  max-width: 400px;
  height: auto;
  pointer-events: none;
  z-index: 0;
  opacity: 0.12;
  mix-blend-mode: screen;
  overflow: hidden;
}
.page-news__particle-img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 桌面端 (min-width: 768px) ===== */
@media (min-width: 768px) {
  .page-news {
    padding: 2.5rem 2rem 4rem;
  }
  .page-news__title {
    font-size: 3rem;
  }
  .page-news__layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 2.5rem;
  }
  /* 索引垂直 */
  .page-news__index {
    flex-direction: column;
    align-items: stretch;
    width: var(--news-index-width);
    flex-shrink: 0;
    padding: 1.5rem 0.75rem;
    background: transparent;
    border: none;
    border-radius: 0;
    position: sticky;
    top: 2rem;
    gap: 1rem;
  }
  .page-news__index-label {
    font-size: 0.625rem;
    text-align: center;
    margin-bottom: 0.25rem;
    display: block;
  }
  .page-news__index-item {
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    padding: 0.5rem 0.25rem;
    border-radius: 4px;
    text-align: center;
    position: relative;
    z-index: 1;
  }
  .page-news__index-dot {
    width: 8px;
    height: 8px;
  }
  .page-news__index-num {
    font-size: 0.8125rem;
  }
  .page-news__index-text {
    display: block;
    font-size: 0.625rem;
    font-weight: 400;
    color: var(--news-text-secondary);
    letter-spacing: 0.03em;
  }
  .page-news__index-line {
    display: block;
    position: absolute;
    left: 50%;
    top: 3rem;
    bottom: 1.5rem;
    width: 1px;
    background: var(--news-border);
    transform: translateX(-50%);
    z-index: 0;
  }
  .page-news__sections {
    flex: 1;
    min-width: 0;
  }
  .page-news__section-top {
    flex-wrap: nowrap;
  }
  .page-news__section-pic {
    order: 1;
    max-width: 420px;
  }
  .page-news__section-pic--slim {
    max-width: 240px;
  }
  .page-news__section-heading-group {
    order: 2;
  }
  .page-news__card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-news__card-grid--wide {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-news__card--large {
    padding: 1.75rem;
  }
  .page-news__card-title {
    font-size: 1.2rem;
  }
  .page-news__particle {
    width: 30%;
    max-width: 360px;
  }
}

/* ===== 大桌面 (min-width: 1024px) ===== */
@media (min-width: 1024px) {
  .page-news {
    padding: 3rem 2.5rem 5rem;
  }
  .page-news__title {
    font-size: 3.5rem;
  }
  .page-news__index {
    width: 100px;
    padding: 2rem 1rem;
    gap: 1.25rem;
  }
  .page-news__index-item {
    padding: 0.6rem 0.5rem;
  }
  .page-news__index-num {
    font-size: 0.9375rem;
  }
  .page-news__index-text {
    font-size: 0.6875rem;
  }
  .page-news__card-grid {
    gap: 1.5rem;
  }
  .page-news__section-pic {
    max-width: 500px;
  }
  .page-news__section-pic--slim {
    max-width: 280px;
  }
}

/* ===== 移动端小屏加固 (max-width: 420px) ===== */
@media (max-width: 420px) {
  .page-news {
    padding: 1.5rem 1rem 2.5rem;
  }
  .page-news__title {
    font-size: 1.75rem;
  }
  .page-news__subtitle {
    font-size: 0.875rem;
  }
  .page-news__index {
    padding: 0.75rem 1rem;
    gap: 0.5rem 0.75rem;
  }
  .page-news__index-item {
    font-size: 0.75rem;
    padding: 0.2rem 0.4rem;
  }
  .page-news__index-num {
    font-size: 0.6875rem;
  }
  .page-news__section-title {
    font-size: 1.375rem;
  }
  .page-news__section-icon {
    width: 60px;
    height: 60px;
  }
  .page-news__card {
    padding: 1.25rem;
  }
  .page-news__card-title {
    font-size: 1rem;
  }
  .page-news__card-text {
    font-size: 0.875rem;
  }
  .page-news__section-pic {
    max-width: 100%;
    height: auto;
  }
  .page-news__particle {
    width: 60%;
  }
}