/* ===== 页面专属：内容专栏 (page-news) ===== */
.page-news {
  --news-accent: var(--color-accent, #FF6B35);
  --news-alt: var(--color-accent-alt, #00B4D8);
  --news-surface: var(--color-surface, #142B4A);
  --news-border: var(--color-border, #2A4265);
  --news-text: var(--text-primary, #FFFFFF);
  --news-text-secondary: var(--text-secondary, #C0C0C0);
  --news-bg: var(--color-background, #0A1F3B);
  --news-card-radius: 4px;
  --news-card-cut: 8px;
  --news-transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-news__container {
  max-width: var(--content-max-width, 1280px);
  margin: 0 auto;
  padding: 0 var(--space-md, 1rem);
  padding-top: var(--space-lg, 2rem);
  padding-bottom: var(--space-2xl, 4rem);
}

/* 面包屑 */
.page-news__breadcrumb {
  margin-bottom: var(--space-lg, 2rem);
  font-family: var(--font-body, 'Inter', 'Roboto', sans-serif);
  font-size: 0.85rem;
  color: var(--news-text-secondary);
}

.page-news__breadcrumb .breadcrumb__link {
  color: var(--news-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast, 150ms ease);
}

.page-news__breadcrumb .breadcrumb__link:hover {
  color: var(--news-accent);
}

.page-news__breadcrumb .breadcrumb__sep {
  margin: 0 0.4rem;
  color: var(--news-border);
}

.page-news__breadcrumb .breadcrumb__current {
  color: var(--news-text);
  font-weight: 600;
}

/* 页面标题区 */
.page-news__header {
  margin-bottom: var(--space-xl, 3rem);
  border-left: 4px solid var(--news-accent);
  padding-left: var(--space-md, 1rem);
}

.page-news__title {
  font-family: var(--font-heading, 'Impact', 'Arial Black', sans-serif);
  font-size: var(--size-h1, clamp(2.2rem, 6vw, 3.5rem));
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  color: var(--news-text);
  margin: 0 0 0.3rem 0;
  line-height: 1.05;
}

.page-news__tagline {
  font-family: var(--font-body, 'Inter', 'Roboto', sans-serif);
  font-size: var(--size-body, 1rem);
  color: var(--news-text-secondary);
  margin: 0;
  letter-spacing: 0.02em;
  max-width: 32em;
}

/* 主布局：侧边栏 + 主内容 */
.page-news__layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl, 3rem);
}

/* 侧边栏 */
.page-news__sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl, 3rem);
  order: 1;
}

.page-news__section-title {
  font-family: var(--font-heading, 'Impact', 'Arial Black', sans-serif);
  font-size: var(--size-h3, 1.2rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--news-text);
  margin: 0 0 var(--space-md, 1rem) 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--news-border);
  position: relative;
}

.page-news__section-title::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 48px;
  height: 2px;
  background: var(--news-accent);
}

.page-news__section-title--main {
  font-size: var(--size-h2, clamp(1.6rem, 4vw, 2.2rem));
}

/* 分类列表 */
.page-news__category-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-news__category-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.8rem;
  border-radius: var(--news-card-radius);
  background: transparent;
  transition: background var(--transition-fast, 150ms ease);
  cursor: pointer;
}

.page-news__category-item:hover {
  background: rgba(255, 107, 53, 0.08);
}

.page-news__category-item--active {
  background: rgba(255, 107, 53, 0.15);
  border-left: 3px solid var(--news-accent);
}

.page-news__category-link {
  color: var(--news-text);
  text-decoration: none;
  font-family: var(--font-body, 'Inter', 'Roboto', sans-serif);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast, 150ms ease);
  flex: 1;
}

.page-news__category-item:hover .page-news__category-link {
  color: var(--news-accent);
}

.page-news__category-count {
  font-family: var(--font-data, 'JetBrains Mono', 'Fira Code', monospace);
  font-size: var(--size-data-small, 0.85rem);
  color: var(--news-alt);
  background: rgba(0, 180, 216, 0.12);
  padding: 0.15rem 0.55rem;
  border-radius: 12px;
  margin-left: 0.5rem;
}

/* 装饰剪影 */
.page-news__decorative-figure {
  margin-top: var(--space-md, 1rem);
  text-align: center;
  opacity: 0.4;
}

.page-news__silhouette {
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

/* 标签云 */
.page-news__tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-news__tag {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  font-family: var(--font-body, 'Inter', 'Roboto', sans-serif);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--news-text-secondary);
  background: var(--news-surface);
  border: 1px solid var(--news-border);
  border-radius: var(--news-card-radius);
  text-decoration: none;
  transition: all var(--transition-fast, 150ms ease);
  letter-spacing: 0.01em;
}

.page-news__tag:hover {
  color: var(--news-text);
  background: var(--news-accent);
  border-color: var(--news-accent);
  transform: translateY(-1px);
}

/* 快速入口按钮 */
.page-news__quick-btn {
  display: block;
  width: 100%;
  margin-bottom: 0.6rem;
  text-align: center;
  font-family: var(--font-body, 'Inter', 'Roboto', sans-serif);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.65rem 1rem;
  border-radius: var(--news-card-radius);
  transition: all var(--transition-fast, 150ms ease);
}

.page-news__quick-btn.btn--alt {
  background: transparent;
  color: var(--news-text);
  border: 1px solid var(--news-border);
}

.page-news__quick-btn.btn--alt:hover {
  border-color: var(--news-accent);
  color: var(--news-accent);
  background: rgba(255, 107, 53, 0.06);
}

.page-news__quick-btn.btn {
  background: var(--news-accent);
  color: var(--text-on-accent, #0A1F3B);
  border: none;
}

.page-news__quick-btn.btn:hover {
  background: var(--news-alt);
  color: var(--news-text);
}

/* 文章网格 */
.page-news__articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

/* 文章卡片 */
.page-news__card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--news-surface);
  border-radius: var(--news-card-radius);
  overflow: hidden;
  transition: transform var(--news-transition), box-shadow var(--news-transition);
  clip-path: polygon(0 0, calc(100% - var(--news-card-cut)) 0, 100% var(--news-card-cut), 100% 100%, 0 100%);
  border: 1px solid var(--news-border);
  cursor: pointer;
}

.page-news__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  border-color: var(--news-accent);
}

/* 卡片图片 */
.page-news__card-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: var(--news-bg);
}

.page-news__card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  display: block;
}

.page-news__card:hover .page-news__card-img {
  transform: scale(1.05);
}

.page-news__card-badge {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  font-family: var(--font-data, 'JetBrains Mono', 'Fira Code', monospace);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.55rem;
  background: var(--news-accent);
  color: var(--text-on-accent, #0A1F3B);
  border-radius: 2px;
  z-index: 2;
}

/* 卡片正文 */
.page-news__card-body {
  padding: var(--space-md, 1rem);
  display: flex;
  flex-direction: column;
  flex: 1;
  position: relative;
}

.page-news__card-title {
  font-family: var(--font-heading, 'Impact', 'Arial Black', sans-serif);
  font-size: var(--size-h3, 1.2rem);
  font-weight: 700;
  color: var(--news-text);
  margin: 0 0 0.5rem 0;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: -0.01em;
}

.page-news__card-summary {
  font-family: var(--font-body, 'Inter', 'Roboto', sans-serif);
  font-size: var(--size-body, 0.95rem);
  color: var(--news-text-secondary);
  line-height: 1.55;
  margin: 0 0 var(--space-md, 1rem) 0;
  flex: 1;
}

.page-news__card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-data, 'JetBrains Mono', 'Fira Code', monospace);
  font-size: var(--size-data-small, 0.8rem);
  color: var(--news-text-secondary);
  border-top: 1px solid rgba(42, 66, 101, 0.5);
  padding-top: 0.6rem;
  margin-top: auto;
}

.page-news__card-source {
  color: var(--news-alt);
}

.page-news__card-reading {
  color: var(--news-text-secondary);
  opacity: 0.7;
}

/* 悬停浮层 */
.page-news__card-hover-layer {
  position: absolute;
  inset: 0;
  background: rgba(10, 31, 59, 0.92);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity var(--news-transition);
  z-index: 3;
  pointer-events: none;
}

.page-news__card:hover .page-news__card-hover-layer {
  opacity: 1;
}

.page-news__hover-text {
  font-family: var(--font-body, 'Inter', 'Roboto', sans-serif);
  font-size: 0.9rem;
  color: var(--news-text);
  text-align: center;
  line-height: 1.5;
  margin: 0 0 1rem 0;
}

.page-news__hover-link {
  font-family: var(--font-heading, 'Impact', 'Arial Black', sans-serif);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--news-accent);
  letter-spacing: 0.08em;
  border-bottom: 2px solid var(--news-accent);
  padding-bottom: 2px;
}

/* 卡片尺寸变体 */
.page-news__card--featured {
  grid-column: 1 / -1;
}

.page-news__card--tall {
  grid-column: 1 / -1;
}

.page-news__card--wide {
  grid-column: 1 / -1;
}

.page-news__card--medium {
  grid-column: 1 / -1;
}

.page-news__card--small {
  grid-column: 1 / -1;
}

/* 底部纹样装饰 */
.page-news__footer-decor {
  margin-top: var(--space-2xl, 4rem);
  text-align: center;
  opacity: 0.25;
  overflow: hidden;
}

.page-news__pattern-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  margin: 0 auto;
}

/* ===== 响应式：平板 >= 640px ===== */
@media (min-width: 640px) {
  .page-news__container {
    padding: 0 var(--space-lg, 2rem);
    padding-top: var(--space-lg, 2rem);
    padding-bottom: var(--space-2xl, 4rem);
  }

  .page-news__articles-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }

  .page-news__card--featured {
    grid-column: 1 / -1;
  }

  .page-news__card--tall {
    grid-row: span 2;
  }

  .page-news__card--wide {
    grid-column: span 2;
  }

  .page-news__card--medium {
    grid-column: span 1;
  }

  .page-news__card--small {
    grid-column: span 1;
  }
}

/* ===== 响应式：桌面 >= 1024px ===== */
@media (min-width: 1024px) {
  .page-news__layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-news__sidebar {
    flex: 0 0 280px;
    position: sticky;
    top: calc(var(--header-top-height, 48px) + var(--nav-height, 52px) + var(--space-md, 1rem));
    order: 0;
  }

  .page-news__main {
    flex: 1;
    min-width: 0;
  }

  .page-news__articles-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .page-news__card--featured {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
  }

  .page-news__card--featured .page-news__card-img-wrap {
    aspect-ratio: auto;
    height: 100%;
  }

  .page-news__card--featured .page-news__card-body {
    padding: var(--space-lg, 2rem);
  }

  .page-news__card--featured .page-news__card-title {
    font-size: var(--size-h2, 1.8rem);
  }

  .page-news__card--tall {
    grid-row: span 2;
  }

  .page-news__card--wide {
    grid-column: span 2;
  }

  .page-news__card--medium {
    grid-column: span 1;
  }

  .page-news__card--small {
    grid-column: span 1;
  }

  .page-news__title {
    font-size: 3.2rem;
  }
}

/* ===== 响应式：大桌面 >= 1280px ===== */
@media (min-width: 1280px) {
  .page-news__container {
    padding: 0 var(--space-xl, 3rem);
    padding-top: var(--space-xl, 3rem);
    padding-bottom: var(--space-2xl, 4rem);
  }

  .page-news__sidebar {
    flex-basis: 300px;
  }

  .page-news__articles-grid {
    gap: 1.75rem;
  }

  .page-news__card-body {
    padding: var(--space-lg, 2rem);
  }
}

/* 无 JavaScript 时的回退：确保悬停层在无 JS 时仍可通过 hover 触发 */
@media (hover: hover) {
  .page-news__card-hover-layer {
    pointer-events: none;
  }
}

/* 触摸设备优化：点击时显示浮层（通过 JS 增强，无 JS 时 hover 不可用则显示摘要） */
@media (hover: none) {
  .page-news__card-hover-layer {
    display: none;
  }

  .page-news__card-summary {
    -webkit-line-clamp: 4;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
}

/* 确保所有图片响应式 */
.page-news img {
  max-width: 100%;
  height: auto;
}