.page-news {
  --color-primary: #0B1D3A;
  --color-accent: #FF6B35;
  --color-background: #FFFFFF;
  --color-surface: #F4F6F9;
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #5A5A5A;
  --color-border: #D1D5DB;
  --font-heading: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-body: Georgia, 'Times New Roman', serif;
  --font-size-h1: 2.25rem;
  --font-size-h2: 1.5rem;
  --font-size-body: 1rem;
  --font-size-small: 0.875rem;
  --line-height-heading: 1.4;
  --line-height-body: 1.6;
  --transition-fast: 0.2s ease;
  --container-padding: 1.25rem;
  --card-radius: 0.5rem;
  --timeline-color: var(--color-border);
}

/* 面包屑 */
.page-news .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
  padding: 0 var(--container-padding);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.page-news .breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.page-news .breadcrumb a:hover {
  opacity: 0.75;
}

.page-news .breadcrumb .sep {
  color: var(--color-border);
}

/* 分屏标题区 */
.page-news .hero-split {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 0 var(--container-padding) 2rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  border-bottom: 2px solid var(--color-surface);
  margin-bottom: 1.5rem;
}

.page-news .hero-text {
  flex: 1 1 55%;
  min-width: 280px;
}

.page-news .hero-text h1 {
  font-family: var(--font-heading);
  font-size: var(--font-size-h1);
  line-height: var(--line-height-heading);
  color: var(--color-primary);
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.page-news .hero-desc {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-secondary);
  margin: 0 0 1.25rem;
  max-width: 38rem;
}

.page-news .hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-news .hero-tags .tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--font-size-small);
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  cursor: default;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.page-news .hero-tags .tag:hover {
  background: var(--color-accent);
  color: #fff;
}

.page-news .hero-image {
  flex: 1 1 35%;
  min-width: 200px;
  align-self: center;
}

.page-news .hero-image img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--card-radius);
  object-fit: cover;
  box-shadow: 0 4px 20px rgba(11, 29, 58, 0.08);
}

/* 筛选栏 */
.page-news .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0 var(--container-padding) 2rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.page-news .filter-bar input[type="radio"] {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

.page-news .filter-label {
  font-family: var(--font-heading);
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  user-select: none;
}

.page-news .filter-label:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.page-news .filter-bar input[type="radio"]:checked + .filter-label {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* 筛选高亮逻辑 (纯CSS) */
.page-news:has(#f-all:checked) .article-card {
  opacity: 1;
}

.page-news:has(#f-tutorial:checked) .article-card[data-category="tutorial"] {
  opacity: 1;
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(255, 107, 53, 0.12);
}

.page-news:has(#f-tutorial:checked) .article-card:not([data-category="tutorial"]) {
  opacity: 0.25;
}

.page-news:has(#f-table:checked) .article-card[data-category="table"] {
  opacity: 1;
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(255, 107, 53, 0.12);
}

.page-news:has(#f-table:checked) .article-card:not([data-category="table"]) {
  opacity: 0.25;
}

.page-news:has(#f-rank:checked) .article-card[data-category="rank"] {
  opacity: 1;
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(255, 107, 53, 0.12);
}

.page-news:has(#f-rank:checked) .article-card:not([data-category="rank"]) {
  opacity: 0.25;
}

.page-news:has(#f-improve:checked) .article-card[data-category="improve"] {
  opacity: 1;
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(255, 107, 53, 0.12);
}

.page-news:has(#f-improve:checked) .article-card:not([data-category="improve"]) {
  opacity: 0.25;
}

/* 文章时间轴 */
.page-news .articles-timeline {
  position: relative;
  padding: 0 var(--container-padding) 3rem;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.page-news .timeline-line {
  display: none;
  position: absolute;
  left: 1.75rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--timeline-color);
}

/* 文章卡片 */
.page-news .article-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem 1rem 1.5rem 3rem;
  margin-bottom: 1.5rem;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  transition: opacity var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.page-news .article-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(255, 107, 53, 0.08);
  transform: translateY(-2px);
}

/* 卡片索引 (时间轴节点) */
.page-news .card-index {
  position: absolute;
  left: 0.25rem;
  top: 1.5rem;
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: var(--font-size-small);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-surface);
  border: 2px solid var(--timeline-color);
  border-radius: 50%;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  z-index: 1;
}

.page-news .article-card:hover .card-index {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* 卡片体 */
.page-news .card-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.page-news .card-text {
  flex: 1;
}

.page-news .card-text h2 {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  line-height: var(--line-height-heading);
  color: var(--color-primary);
  margin: 0 0 0.5rem;
}

.page-news .card-summary {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text-secondary);
  margin: 0 0 0.75rem;
}

/* details / summary */
.page-news .card-details {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  color: var(--color-text-primary);
  line-height: var(--line-height-body);
}

.page-news .card-details summary {
  display: inline-block;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: var(--font-size-small);
  color: var(--color-accent);
  border-bottom: 1px dashed var(--color-accent);
  transition: color var(--transition-fast), border-color var(--transition-fast);
  padding: 0.15rem 0;
}

.page-news .card-details summary:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.page-news .card-details .details-content {
  padding-top: 0.75rem;
  max-width: 36rem;
}

.page-news .card-details .details-content p {
  margin: 0;
}

.page-news .card-details .details-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: opacity var(--transition-fast);
}

.page-news .card-details .details-content a:hover {
  opacity: 0.7;
}

/* 卡片媒体 */
.page-news .card-media {
  flex-shrink: 0;
  width: 100%;
  max-width: 300px;
}

.page-news .card-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--card-radius);
  object-fit: cover;
  border: 1px solid var(--color-border);
}

/* 无图替代占位 */
.page-news .card-media--alt {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 200px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #1a3355 100%);
  border-radius: var(--card-radius);
  border: 1px solid var(--color-primary);
}

.page-news .media-placeholder {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-accent);
  letter-spacing: 0.3em;
  opacity: 0.8;
}

/* 桌面端 ≥768px */
@media screen and (min-width: 768px) {
  .page-news {
    --font-size-h1: 3rem;
    --font-size-h2: 1.75rem;
    --container-padding: 2rem;
  }

  .page-news .timeline-line {
    display: block;
  }

  .page-news .article-card {
    padding-left: 4rem;
    padding-right: 1.5rem;
  }

  .page-news .card-index {
    left: 0.5rem;
    top: 1.75rem;
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1rem;
  }

  .page-news .card-body {
    flex-direction: row;
    align-items: flex-start;
    gap: 1.5rem;
  }

  .page-news .card-media {
    width: 240px;
    max-width: 240px;
  }

  .page-news .card-media--alt {
    width: 240px;
    height: 200px;
  }

  .page-news .hero-split {
    flex-wrap: nowrap;
    padding-bottom: 2.5rem;
  }

  .page-news .hero-image {
    max-width: 480px;
  }
}

/* 大桌面 ≥1024px */
@media screen and (min-width: 1024px) {
  .page-news {
    --font-size-h1: 3.5rem;
    --container-padding: 2.5rem;
  }

  .page-news .card-media {
    width: 300px;
    max-width: 300px;
  }

  .page-news .card-media--alt {
    width: 300px;
    height: 200px;
  }

  .page-news .article-card {
    padding-left: 5rem;
    padding-right: 2rem;
  }

  .page-news .card-index {
    left: 0.75rem;
    width: 2.75rem;
    height: 2.75rem;
  }
}