/* ===== page-news 文章中心 页面专属样式 ===== */
.page-news {
  --news-sidebar-w: 280px;
  --news-timeline-color: #06D6A0;
  --news-node-color: #E63946;
  --news-card-bg: #1e1e1e;
  --news-card-border: #A8B2C1;
  --news-card-radius: 6px;
  --news-shadow-hover: 0 8px 32px rgba(6, 214, 160, 0.18);
  --news-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: block;
  background-color: var(--color-bg-dark, #1A1A1A);
  color: var(--color-text-light, #F1FAEE);
  font-family: var(--font-body, 'Open Sans', sans-serif);
}

/* ===== 左右布局 ===== */
.page-news__layout {
  display: flex;
  flex-direction: column;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  min-height: 70vh;
}

/* ===== 左侧筛选栏 ===== */
.page-news__sidebar {
  background-color: var(--color-bg-panel, #2B2D42);
  padding: var(--spacing-lg, 2rem) var(--spacing-md, 1rem);
  border-bottom: 2px solid var(--news-timeline-color);
  flex-shrink: 0;
}

.page-news__sidebar-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-md, 1rem);
  max-width: 400px;
  margin: 0 auto;
}

.page-news__sidebar-icon {
  width: 50px;
  height: 50px;
  object-fit: contain;
  border-radius: var(--border-radius, 4px);
  opacity: 0.9;
}

.page-news__sidebar-title {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: var(--font-size-h1, 4rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: 2px;
  color: var(--color-primary, #E63946);
  margin: 0;
  line-height: 1;
  text-transform: uppercase;
}

.page-news__sidebar-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted, #A8B2C1);
  margin: 0;
  letter-spacing: 1px;
}

.page-news__filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm, 0.5rem);
  width: 100%;
}

.page-news__filter-btn {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 0.5rem 1.2rem;
  background: transparent;
  border: 2px solid var(--color-secondary, #A8B2C1);
  color: var(--color-text-muted, #A8B2C1);
  border-radius: var(--border-radius, 4px);
  cursor: pointer;
  transition: var(--news-transition);
  outline: none;
}

.page-news__filter-btn:hover,
.page-news__filter-btn:focus-visible {
  border-color: var(--color-accent, #06D6A0);
  color: var(--color-accent, #06D6A0);
  box-shadow: 0 0 12px rgba(6, 214, 160, 0.25);
}

.page-news__filter-btn.is-active {
  background-color: var(--color-primary, #E63946);
  border-color: var(--color-primary, #E63946);
  color: #fff;
}

.page-news__filter-btn.is-active:hover,
.page-news__filter-btn.is-active:focus-visible {
  background-color: var(--color-primary-hover, #ff4d5a);
  border-color: var(--color-primary-hover, #ff4d5a);
  box-shadow: 0 0 12px rgba(230, 57, 70, 0.35);
}

.page-news__sidebar-footnote {
  font-size: 0.8rem;
  color: var(--color-text-muted, #A8B2C1);
  margin: var(--spacing-sm, 0.5rem) 0 0 0;
  font-style: italic;
  border-left: 3px solid var(--color-accent, #06D6A0);
  padding-left: var(--spacing-sm, 0.5rem);
}

/* ===== 右侧内容区 ===== */
.page-news__content {
  flex: 1;
  padding: var(--spacing-lg, 2rem) var(--spacing-md, 1rem);
  position: relative;
}

.page-news__content-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-sm, 0.5rem);
  margin-bottom: var(--spacing-lg, 2rem);
  padding-bottom: var(--spacing-sm, 0.5rem);
  border-bottom: 1px solid var(--color-secondary, #A8B2C1);
}

.page-news__content-heading {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: var(--font-size-h2, 3rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: 2px;
  color: var(--color-text-light, #F1FAEE);
  margin: 0;
  line-height: 1.2;
}

.page-news__content-count {
  font-family: var(--font-mono, monospace);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent, #06D6A0);
  background: rgba(6, 214, 160, 0.12);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  border: 1px solid rgba(6, 214, 160, 0.3);
}

/* ===== 时间轴 ===== */
.page-news__timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-left: 1.8rem;
}

/* 时间轴竖线 */
.page-news__timeline::before {
  content: '';
  position: absolute;
  left: 0.6rem;
  top: 1.2rem;
  bottom: 1.2rem;
  width: 3px;
  background: linear-gradient(to bottom, var(--news-timeline-color), rgba(6, 214, 160, 0.2));
  border-radius: 2px;
  pointer-events: none;
}

/* ===== 卡片 ===== */
.page-news__card {
  position: relative;
  background: var(--news-card-bg);
  border: 1px solid rgba(168, 178, 193, 0.25);
  border-radius: var(--news-card-radius);
  margin-bottom: var(--spacing-md, 1rem);
  transition: var(--news-transition);
  list-style: none;
}

/* 去除 details 默认三角 */
.page-news__card::-webkit-details-marker {
  display: none;
}
.page-news__card::marker {
  display: none;
  content: '';
}

/* 时间轴节点 */
.page-news__card::before {
  content: '';
  position: absolute;
  left: -1.55rem;
  top: 1.8rem;
  width: 14px;
  height: 14px;
  background: var(--news-node-color);
  border: 3px solid var(--news-timeline-color);
  border-radius: 50%;
  z-index: 2;
  transition: var(--news-transition);
  box-shadow: 0 0 0 4px rgba(6, 214, 160, 0.1);
}

/* 卡片悬停光晕 */
.page-news__card:hover {
  border-color: var(--color-accent, #06D6A0);
  box-shadow: var(--news-shadow-hover);
  transform: translateX(4px);
}

.page-news__card:hover::before {
  background: var(--color-accent, #06D6A0);
  box-shadow: 0 0 0 6px rgba(6, 214, 160, 0.2);
}

/* 卡片摘要区（可点击） */
.page-news__card-summary {
  display: block;
  cursor: pointer;
  padding: var(--spacing-md, 1rem) var(--spacing-md, 1rem) var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  transition: var(--news-transition);
  user-select: none;
}

.page-news__card-summary::-webkit-details-marker {
  display: none;
}
.page-news__card-summary::marker {
  display: none;
  content: '';
}

.page-news__card-summary:hover {
  background: rgba(230, 57, 70, 0.04);
}

/* 卡片元信息 */
.page-news__card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm, 0.5rem);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xs, 0.25rem);
}

.page-news__card-date {
  font-family: var(--font-mono, monospace);
  font-size: 0.8rem;
  color: var(--color-text-muted, #A8B2C1);
  letter-spacing: 0.5px;
}

.page-news__card-title {
  display: block;
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: var(--font-size-h3, 2rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: 1.5px;
  color: var(--color-primary, #E63946);
  line-height: 1.15;
  margin: var(--spacing-xs, 0.25rem) 0;
}

.page-news__card-summary-text {
  display: block;
  font-size: 0.95rem;
  color: var(--color-text-light, #F1FAEE);
  line-height: 1.5;
  margin: var(--spacing-xs, 0.25rem) 0;
  opacity: 0.85;
}

.page-news__card-thumb {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--border-radius, 4px);
  margin-top: var(--spacing-sm, 0.5rem);
  border: 1px solid rgba(168, 178, 193, 0.15);
  transition: var(--news-transition);
}

.page-news__card-thumb--small {
  max-width: 200px;
  width: 100%;
}

.page-news__card:hover .page-news__card-thumb {
  border-color: rgba(6, 214, 160, 0.3);
}

/* 卡片详细内容（展开区） */
.page-news__card-body {
  padding: 0 var(--spacing-md, 1rem) var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  border-top: 1px solid rgba(168, 178, 193, 0.12);
  animation: page-news-fadeIn 0.4s ease;
}

.page-news__card-body p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-light, #F1FAEE);
  margin: var(--spacing-sm, 0.5rem) 0;
  opacity: 0.9;
}

.page-news__card-footer {
  margin-top: var(--spacing-md, 1rem);
  padding-top: var(--spacing-sm, 0.5rem);
  display: flex;
  gap: var(--spacing-sm, 0.5rem);
  flex-wrap: wrap;
}

/* 展开动画 */
@keyframes page-news-fadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* details 展开状态 */
.page-news__card[open] {
  border-color: rgba(6, 214, 160, 0.35);
  box-shadow: 0 4px 24px rgba(6, 214, 160, 0.10);
}

.page-news__card[open]::before {
  background: var(--color-accent, #06D6A0);
  box-shadow: 0 0 0 6px rgba(6, 214, 160, 0.25);
}

.page-news__card[open] .page-news__card-summary {
  padding-bottom: var(--spacing-sm, 0.5rem);
}

/* 底部提示 */
.page-news__content-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted, #A8B2C1);
  margin-top: var(--spacing-xl, 4rem);
  padding-top: var(--spacing-md, 1rem);
  border-top: 1px solid rgba(168, 178, 193, 0.12);
  letter-spacing: 0.5px;
  font-style: italic;
}

/* ===== 桌面端 (≥768px) ===== */
@media (min-width: 768px) {
  .page-news__layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-news__sidebar {
    width: var(--news-sidebar-w);
    min-width: var(--news-sidebar-w);
    border-bottom: none;
    border-right: 2px solid var(--news-timeline-color);
    padding: var(--spacing-xl, 4rem) var(--spacing-lg, 2rem);
    position: sticky;
    top: var(--header-height, 4rem);
    align-self: stretch;
    min-height: calc(100vh - var(--header-height, 4rem));
  }

  .page-news__sidebar-inner {
    max-width: none;
    margin: 0;
    gap: var(--spacing-lg, 2rem);
  }

  .page-news__sidebar-title {
    font-size: calc(var(--font-size-h1, 4rem) * 0.9);
  }

  .page-news__filter {
    flex-direction: column;
    gap: var(--spacing-sm, 0.5rem);
  }

  .page-news__filter-btn {
    width: 100%;
    text-align: left;
    padding: 0.6rem 1.2rem;
    font-size: 1rem;
  }

  .page-news__content {
    padding: var(--spacing-xl, 4rem) var(--spacing-lg, 2rem) var(--spacing-xl, 4rem) var(--spacing-lg, 2rem);
    max-width: calc(100% - var(--news-sidebar-w));
  }

  .page-news__timeline {
    padding-left: 2.4rem;
  }

  .page-news__timeline::before {
    left: 0.8rem;
  }

  .page-news__card::before {
    left: -2rem;
    width: 18px;
    height: 18px;
  }

  .page-news__card-summary {
    padding: var(--spacing-lg, 2rem) var(--spacing-lg, 2rem) var(--spacing-lg, 2rem) var(--spacing-xl, 4rem);
  }

  .page-news__card-body {
    padding: 0 var(--spacing-lg, 2rem) var(--spacing-lg, 2rem) var(--spacing-xl, 4rem);
  }

  .page-news__card-title {
    font-size: var(--font-size-h2, 3rem);
  }

  .page-news__content-heading {
    font-size: calc(var(--font-size-h1, 4rem) * 0.85);
  }

  .page-news__sidebar-footnote {
    font-size: 0.85rem;
  }
}

/* ===== 大桌面端 (≥1024px) ===== */
@media (min-width: 1024px) {
  .page-news__sidebar {
    width: 320px;
    min-width: 320px;
    padding: var(--spacing-xl, 4rem) var(--spacing-xl, 4rem);
  }

  .page-news__sidebar-title {
    font-size: var(--font-size-h1, 4rem);
  }

  .page-news__content {
    padding: var(--spacing-xl, 4rem) var(--spacing-xl, 4rem) var(--spacing-xl, 4rem) var(--spacing-lg, 2rem);
  }

  .page-news__card-summary {
    padding: var(--spacing-xl, 4rem) var(--spacing-xl, 4rem) var(--spacing-xl, 4rem) 4.5rem;
  }

  .page-news__card-body {
    padding: 0 var(--spacing-xl, 4rem) var(--spacing-xl, 4rem) 4.5rem;
  }

  .page-news__card-title {
    font-size: var(--font-size-h2, 3rem);
  }
}

/* ===== 窄屏微调 (≤400px) ===== */
@media (max-width: 400px) {
  .page-news__sidebar {
    padding: var(--spacing-md, 1rem) var(--spacing-sm, 0.5rem);
  }

  .page-news__sidebar-title {
    font-size: calc(var(--font-size-h1, 4rem) * 0.6);
  }

  .page-news__content {
    padding: var(--spacing-md, 1rem) var(--spacing-sm, 0.5rem);
  }

  .page-news__timeline {
    padding-left: 1.4rem;
  }

  .page-news__card-summary {
    padding: var(--spacing-sm, 0.5rem) var(--spacing-sm, 0.5rem) var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
  }

  .page-news__card-body {
    padding: 0 var(--spacing-sm, 0.5rem) var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
  }

  .page-news__card-title {
    font-size: calc(var(--font-size-h3, 2rem) * 0.85);
  }

  .page-news__card::before {
    left: -1.1rem;
    width: 12px;
    height: 12px;
  }

  .page-news__content-heading {
    font-size: calc(var(--font-size-h2, 3rem) * 0.7);
  }
}