.page-news {
  --page-gap: 24px;
  --page-timeline-dot-size: 14px;
  --page-timeline-line-width: 2px;
  --page-featured-card-min-h: 320px;
  position: relative;
  z-index: 1;
  padding: var(--header-h, 72px) 0 60px;
  color: var(--text-primary, #FFFFFF);
  background: var(--bg-main, #1A1A2E);
  overflow: hidden;
}

.page-news__bg-diagonal {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--bg-secondary, #16213E) 30%, transparent 30%);
  pointer-events: none;
  z-index: 0;
}

.page-news__container {
  position: relative;
  z-index: 1;
  max-width: var(--max-w, 1280px);
  margin: 0 auto;
  padding: 0 var(--page-gap);
}

/* 面包屑 */
.page-news__breadcrumb {
  margin-bottom: 16px;
  font-size: 0.875rem;
  color: var(--text-secondary, #B0BEC5);
}

.page-news__breadcrumb a {
  color: var(--brand, #00C4B4);
  text-decoration: none;
}

.page-news__breadcrumb a:hover {
  text-decoration: underline;
}

.page-news__breadcrumb-sep {
  margin: 0 8px;
}

/* 头部 */
.page-news__header {
  margin-bottom: 40px;
}

.page-news__title {
  font-family: var(--font-heading, system-ui, sans-serif);
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.page-news__subtitle {
  font-family: var(--font-body, Georgia, serif);
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--text-secondary, #B0BEC5);
  margin: 0 0 16px;
}

.page-news__header-image {
  max-width: 600px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--glass-border, rgba(255,255,255,0.12));
  background: var(--glass, rgba(255,255,255,0.08));
}

.page-news__header-image img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* 布局网格 */
.page-news__layout {
  display: flex;
  flex-direction: column;
  gap: calc(var(--page-gap) * 2);
}

/* 时间轴 */
.page-news__timeline-section {
  flex: 1;
}

.page-news__section-title {
  font-family: var(--font-heading, system-ui, sans-serif);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 24px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-highlight, #00C4B4);
  display: inline-block;
}

.page-news__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-news__timeline-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 0;
  position: relative;
  border-left: var(--page-timeline-line-width) solid var(--glass-border, rgba(255,255,255,0.12));
  padding-left: calc(var(--page-timeline-dot-size) + 16px);
  transition: background 0.2s ease;
  cursor: default;
}

.page-news__timeline-item:first-child {
  padding-top: 0;
}

.page-news__timeline-item:last-child {
  border-left-color: transparent;
}

.page-news__timeline-item:hover {
  background: var(--glass, rgba(255,255,255,0.08));
  border-radius: 8px;
}

.page-news__timeline-dot {
  position: absolute;
  left: calc(-1 * var(--page-timeline-dot-size) / 2 + var(--page-timeline-line-width) / 2);
  top: 22px;
  width: var(--page-timeline-dot-size);
  height: var(--page-timeline-dot-size);
  background: var(--brand, #00C4B4);
  border-radius: 50%;
  border: 2px solid var(--bg-main, #1A1A2E);
  flex-shrink: 0;
  z-index: 1;
}

.page-news__timeline-item:first-child .page-news__timeline-dot {
  top: 6px;
}

.page-news__timeline-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  flex-shrink: 0;
  object-fit: cover;
  background: var(--glass, rgba(255,255,255,0.08));
  display: none;
}

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

.page-news__timeline-content strong {
  display: block;
  font-family: var(--font-heading, system-ui, sans-serif);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.page-news__timeline-meta {
  display: inline-block;
  font-family: var(--font-data, 'Courier New', monospace);
  font-size: 0.75rem;
  color: var(--accent, #FF6B35);
  margin-bottom: 4px;
  padding: 2px 8px;
  border: 1px solid var(--accent, #FF6B35);
  border-radius: 4px;
  background: rgba(255, 107, 53, 0.1);
}

.page-news__timeline-summary {
  font-family: var(--font-body, Georgia, serif);
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-secondary, #B0BEC5);
  margin: 4px 0 0;
  display: none;
}

.page-news__timeline-item:hover .page-news__timeline-summary {
  display: block;
  animation: page-news-fadeIn 0.25s ease;
}

@keyframes page-news-fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 右侧精选卡片 */
.page-news__featured-section {
  flex: 1;
  min-width: 0;
}

.page-news__featured-card {
  position: relative;
  min-height: var(--page-featured-card-min-h);
  background: var(--glass, rgba(255,255,255,0.08));
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border, rgba(255,255,255,0.12));
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  transition: border-color 0.3s ease;
}

.page-news__featured-card:hover {
  border-color: var(--brand, #00C4B4);
}

.page-news__featured-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.page-news__featured-bg-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
}

.page-news__featured-content {
  position: relative;
  z-index: 1;
  padding: 24px;
  background: linear-gradient(to top, rgba(26,26,46,0.95) 40%, transparent);
}

.page-news__featured-item {
  margin-bottom: 16px;
}

.page-news__featured-item[data-carousel-item] {
  display: block;
}

.page-news__featured-title {
  font-family: var(--font-heading, system-ui, sans-serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 0 8px;
  line-height: 1.2;
}

.page-news__featured-text {
  font-family: var(--font-body, Georgia, serif);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary, #B0BEC5);
  margin: 0;
}

/* 卡片导航 */
.page-news__featured-nav {
  position: relative;
  z-index: 2;
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  padding: 0 24px 16px;
}

.page-news__nav-btn {
  background: var(--glass, rgba(255,255,255,0.08));
  border: 1px solid var(--border-highlight, #00C4B4);
  color: var(--text-primary, #FFFFFF);
  font-size: 1.5rem;
  line-height: 1;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.page-news__nav-btn:hover {
  background: var(--brand, #00C4B4);
  color: var(--bg-main, #1A1A2E);
  transform: scale(1.05);
}

.page-news__nav-btn:focus-visible {
  outline: 2px solid var(--accent, #FF6B35);
  outline-offset: 2px;
}

/* 快速链接 */
.page-news__quick-links {
  margin-top: 24px;
  padding: 16px;
  background: var(--glass, rgba(255,255,255,0.04));
  border-radius: 8px;
  border: 1px solid var(--glass-border, rgba(255,255,255,0.08));
}

.page-news__quick-links p {
  font-weight: 600;
  margin: 0 0 8px;
  font-family: var(--font-heading, system-ui, sans-serif);
  font-size: 0.9rem;
}

.page-news__quick-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-news__quick-links a {
  color: var(--brand, #00C4B4);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.2s ease;
}

.page-news__quick-links a:hover {
  background: var(--glass, rgba(255,255,255,0.08));
  text-decoration: underline;
}

/* 桌面端: ≥ 768px */
@media (min-width: 768px) {
  .page-news__bg-diagonal {
    background: linear-gradient(135deg, var(--bg-secondary, #16213E) 25%, transparent 25%);
  }

  .page-news__layout {
    flex-direction: row;
    gap: var(--page-gap);
  }

  .page-news__timeline-section {
    width: 45%;
    flex: none;
  }

  .page-news__featured-section {
    width: 55%;
    flex: none;
  }

  .page-news__timeline-icon {
    display: block;
  }

  .page-news__timeline-summary {
    display: block;
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: opacity 0.3s ease, max-height 0.3s ease, margin 0.3s ease;
    margin: 0;
  }

  .page-news__timeline-item:hover .page-news__timeline-summary {
    opacity: 1;
    max-height: 100px;
    margin-top: 4px;
  }

  .page-news__featured-card {
    min-height: 380px;
  }
}

/* 桌面端: ≥ 1024px */
@media (min-width: 1024px) {
  .page-news__header {
    margin-bottom: 56px;
  }

  .page-news__title {
    font-size: 3.5rem;
  }

  .page-news__subtitle {
    font-size: 1.25rem;
  }

  .page-news__layout {
    gap: calc(var(--page-gap) * 2);
  }

  .page-news__timeline-content strong {
    font-size: 1.2rem;
  }

  .page-news__featured-title {
    font-size: 1.6rem;
  }
}

/* 桌面端: ≥ 1280px */
@media (min-width: 1280px) {
  .page-news__container {
    padding: 0 var(--gap, 24px);
  }

  .page-news__featured-card {
    min-height: 420px;
  }
}