.page-news {
  --page-clr-bg: var(--clr-light, #F5F5F5);
  --page-clr-text: var(--clr-text, #111);
  --page-clr-accent: var(--clr-primary, #FF6B35);
  --page-clr-dark: var(--clr-dark, #1A2B3C);
  --page-clr-green: var(--clr-accent, #4CAF50);
  --page-clr-white: var(--clr-white, #fff);
  --page-clr-glass: rgba(255, 255, 255, 0.7);
  --page-radius-card: var(--radius-md, 8px);
  --page-radius-lg: var(--radius-lg, 16px);
  --page-shadow-card: var(--shadow-sm, 0 1px 3px rgba(0,0,0,0.08));
  --page-shadow-hover: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.12));
  --page-font-primary: var(--font-primary, "PingFang SC", "Microsoft YaHei", sans-serif);
  --page-font-mono: var(--font-mono, "SF Mono", "Courier New", monospace);
  --page-space-sm: var(--space-sm, 0.5rem);
  --page-space-md: var(--space-md, 1rem);
  --page-space-lg: var(--space-lg, 2rem);
  --page-space-xl: var(--space-xl, 3rem);
  --page-max-width: var(--max-width, 1200px);
  --page-header-h: var(--header-h, 56px);

  display: block;
  background: var(--page-clr-bg);
  font-family: var(--page-font-primary);
  color: var(--page-clr-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== Hero 首屏 ===== */
.page-news-hero {
  position: relative;
  overflow: hidden;
  height: 280px;
  display: flex;
  align-items: flex-end;
  margin-top: calc(-1 * var(--page-header-h));
  padding-top: var(--page-header-h);
}

.page-news-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-news-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
}

.page-news-hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(90deg, rgba(26, 43, 60, 0.85) 0%, rgba(26, 43, 60, 0.4) 100%);
}

.page-news-hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--page-space-lg) var(--page-space-md) var(--page-space-xl);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--page-space-sm);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--page-space-sm);
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  transition: color var(--transition, 0.25s);
}

.breadcrumb a:hover {
  color: var(--page-clr-accent);
}

.breadcrumb-sep {
  color: rgba(255, 255, 255, 0.4);
}

.breadcrumb [aria-current="page"] {
  color: var(--page-clr-accent);
  font-weight: 600;
}

.page-news-hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--page-clr-white);
  margin: 0 0 var(--page-space-sm);
  line-height: 1.1;
}

.page-news-hero-desc {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 560px;
  margin: 0;
}

/* ===== 主体布局 ===== */
.page-news-body {
  display: flex;
  gap: var(--page-space-xl);
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--page-space-lg) var(--page-space-md) var(--page-space-xl);
}

.page-news-toc {
  flex: 0 0 180px;
  position: sticky;
  top: calc(var(--page-header-h) + var(--page-space-md));
  align-self: start;
  margin-top: var(--page-space-md);
}

.page-news-toc .small-index {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--page-clr-dark);
  opacity: 0.5;
  margin-bottom: var(--page-space-sm);
}

.page-news-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--page-space-sm);
}

.page-news-toc-link {
  display: block;
  padding: var(--page-space-sm) var(--page-space-sm);
  font-size: 0.85rem;
  color: var(--page-clr-text);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all var(--transition, 0.25s);
  font-weight: 500;
}

.page-news-toc-link:hover {
  border-left-color: var(--page-clr-accent);
  color: var(--page-clr-accent);
  padding-left: var(--page-space-md);
}

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

/* ===== Section 通用 ===== */
.page-news-section {
  margin-bottom: var(--page-space-xl);
}

.page-news-section-header {
  display: flex;
  flex-direction: column;
  gap: var(--page-space-sm);
  margin-bottom: var(--page-space-lg);
}

.page-news-section-header .tag {
  align-self: flex-start;
}

.page-news-section-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--page-clr-dark);
}

.page-news-section-subtitle {
  font-size: 0.95rem;
  color: var(--page-clr-dark-gray, #333);
  opacity: 0.7;
  margin: 0;
}

/* ===== 时间轴（窄段） ===== */
.page-news-timeline {
  position: relative;
  padding-left: var(--page-space-lg);
}

.page-news-timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--page-clr-accent), var(--page-clr-green));
  opacity: 0.3;
}

.page-news-timeline-item {
  position: relative;
  margin-bottom: var(--page-space-lg);
}

.page-news-timeline-marker {
  position: absolute;
  left: calc(-1 * var(--page-space-lg) + 6px - 6px);
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--page-clr-accent);
  border: 2px solid var(--page-clr-white);
  box-shadow: 0 0 0 2px var(--page-clr-accent);
  z-index: 1;
}

.page-news-timeline-card {
  background: var(--page-clr-glass);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--page-radius-card);
  padding: var(--page-space-md);
  transition: box-shadow var(--transition, 0.25s);
}

.page-news-timeline-card:hover {
  box-shadow: var(--page-shadow-hover);
}

.page-news-timeline-card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--page-space-md);
  margin-bottom: var(--page-space-sm);
}

.page-news-timeline-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm, 4px);
  object-fit: contain;
  flex-shrink: 0;
  background: var(--page-clr-white);
  padding: 4px;
}

.page-news-timeline-title {
  margin: 0;
  flex: 1;
}

.page-news-toggle-btn {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--page-space-sm);
  width: 100%;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 600;
  transition: color var(--transition, 0.25s);
}

.page-news-toggle-btn:hover {
  color: var(--page-clr-accent);
}

.page-news-toggle-btn[aria-expanded="true"] .page-news-toggle-text {
  color: var(--page-clr-accent);
}

.page-news-toggle-icon {
  font-size: 1.2rem;
  font-weight: 300;
  line-height: 1;
  color: var(--page-clr-accent);
  transition: transform var(--transition, 0.25s);
  flex-shrink: 0;
}

.page-news-toggle-btn[aria-expanded="true"] .page-news-toggle-icon {
  transform: rotate(45deg);
}

.page-news-timeline-summary {
  font-size: 0.9rem;
  color: var(--page-clr-dark-gray, #333);
  opacity: 0.75;
  margin: 0 0 0 52px;
}

.page-news-timeline-detail {
  margin: var(--page-space-sm) 0 0 52px;
  font-size: 0.95rem;
  color: var(--page-clr-text);
  line-height: 1.65;
  padding: var(--page-space-sm) var(--page-space-md);
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-sm, 4px);
  border-left: 3px solid var(--page-clr-accent);
}

.page-news-timeline-detail p {
  margin: 0;
}

.page-news-more-tip {
  display: flex;
  align-items: center;
  gap: var(--page-space-md);
  padding: var(--page-space-md);
  margin-top: var(--page-space-lg);
  background: var(--page-clr-white);
  border-radius: var(--page-radius-card);
  box-shadow: var(--page-shadow-card);
  font-size: 0.9rem;
  color: var(--page-clr-dark-gray, #333);
}

.page-news-more-tip a {
  color: var(--page-clr-accent);
  text-decoration: underline;
  font-weight: 500;
}

/* ===== 分割装饰 ===== */
.page-news-divider {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: var(--page-space-lg) auto;
  max-width: 400px;
}

.page-news-divider-img {
  width: 100%;
  height: auto;
  max-height: 100px;
  object-fit: contain;
  opacity: 0.6;
}

/* ===== FAQ 宽段 ===== */
.page-news-faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--page-space-md);
}

.page-news-faq-card {
  background: var(--page-clr-white);
  border-radius: var(--page-radius-card);
  box-shadow: var(--page-shadow-card);
  padding: var(--page-space-md);
  transition: box-shadow var(--transition, 0.25s);
}

.page-news-faq-card:hover {
  box-shadow: var(--page-shadow-hover);
}

.page-news-faq-q {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.page-news-toggle-btn-faq .page-news-toggle-text {
  font-size: 1rem;
  font-weight: 600;
}

.page-news-faq-a {
  margin-top: var(--page-space-sm);
  padding-top: var(--page-space-sm);
  border-top: 1px solid var(--page-clr-light, #F5F5F5);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--page-clr-dark-gray, #333);
}

.page-news-faq-a a {
  color: var(--page-clr-accent);
  text-decoration: underline;
}

.page-news-faq-footnote {
  margin-top: var(--page-space-lg);
  text-align: center;
  font-size: 0.9rem;
  color: var(--page-clr-dark-gray, #333);
  opacity: 0.7;
}

.page-news-faq-footnote a {
  color: var(--page-clr-accent);
  text-decoration: underline;
}

/* ===== 底部视觉 ===== */
.page-news-bottom-visual {
  max-width: var(--page-max-width);
  margin: 0 auto var(--page-space-xl);
  padding: 0 var(--page-space-md);
  border-radius: var(--page-radius-lg);
  overflow: hidden;
}

.page-news-bottom-img {
  width: 100%;
  height: auto;
  max-height: 200px;
  object-fit: cover;
  border-radius: var(--page-radius-lg);
  display: block;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: var(--page-space-lg);
  right: var(--page-space-lg);
  z-index: 999;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--page-clr-accent);
  color: var(--page-clr-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.12));
  transition: opacity var(--transition, 0.25s), transform var(--transition, 0.25s);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--page-clr-primary-light, #FF9A76);
  transform: translateY(-2px);
}

/* ===== 移动端优先 ===== */
@media (max-width: 768px) {
  .page-news-hero {
    height: 220px;
  }

  .page-news-hero-title {
    font-size: 1.8rem;
  }

  .page-news-hero-desc {
    font-size: 0.85rem;
  }

  .page-news-body {
    flex-direction: column;
    padding: var(--page-space-md);
    gap: var(--page-space-md);
  }

  .page-news-toc {
    position: static;
    flex: none;
    width: 100%;
    margin-top: 0;
    background: var(--page-clr-white);
    padding: var(--page-space-md);
    border-radius: var(--page-radius-card);
    box-shadow: var(--page-shadow-card);
  }

  .page-news-toc-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0;
  }

  .page-news-toc-link {
    padding: var(--page-space-sm) var(--page-space-md);
    border-left: none;
    border-bottom: 2px solid transparent;
    font-size: 0.8rem;
  }

  .page-news-toc-link:hover {
    border-left-color: transparent;
    border-bottom-color: var(--page-clr-accent);
    padding-left: var(--page-space-md);
  }

  .page-news-section-title {
    font-size: 1.4rem;
  }

  .page-news-timeline {
    padding-left: var(--page-space-md);
  }

  .page-news-timeline::before {
    left: 4px;
  }

  .page-news-timeline-marker {
    left: calc(-1 * var(--page-space-md) + 4px - 6px);
    width: 10px;
    height: 10px;
  }

  .page-news-timeline-card-header {
    gap: var(--page-space-sm);
  }

  .page-news-timeline-icon {
    width: 32px;
    height: 32px;
  }

  .page-news-timeline-summary,
  .page-news-timeline-detail {
    margin-left: 0;
  }

  .page-news-timeline-detail {
    margin-top: var(--page-space-sm);
    padding: var(--page-space-sm);
  }

  .page-news-more-tip {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--page-space-sm);
  }

  .page-news-faq-grid {
    grid-template-columns: 1fr;
  }

  .page-news-divider-img {
    max-height: 60px;
  }

  .page-news-bottom-visual {
    padding: 0 var(--page-space-md);
  }

  .back-to-top {
    bottom: var(--page-space-md);
    right: var(--page-space-md);
    width: 40px;
    height: 40px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .page-news-toc {
    flex: 0 0 140px;
  }

  .page-news-hero-title {
    font-size: 2.2rem;
  }

  .page-news-faq-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1025px) {
  .page-news-faq-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-news-timeline-card {
    padding: var(--page-space-lg);
  }
}

.page-news {
  --page-clr-dark-gray: currentColor;
  --page-clr-light: currentColor;
  --page-clr-primary-light: transparent;
}