.page-news {
  --news-accent-gold: #FFD700;
  --news-accent-green: #39FF14;
  --news-accent-violet: #7B5EA7;
  --news-line-color: rgba(197, 165, 90, 0.35);
  --news-dot-color: #C5A55A;
  --news-card-bg: rgba(10, 25, 47, 0.75);
  --news-card-border: rgba(197, 165, 90, 0.15);
  --news-card-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  --news-radius: 12px;
  --news-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);

  display: block;
  max-width: 100%;
  overflow-x: hidden;
  color: var(--color-white, #F5F5F5);
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
}

/* ====== 首屏 ====== */
.news-hero {
  position: relative;
  width: 100%;
  height: auto;
  min-height: 360px;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-dark-blue, #0A192F) 0%, var(--color-deep-indigo, #1A1A2E) 60%, var(--color-violet, #4B2E83) 100%);
  display: flex;
  align-items: center;
  border-bottom: 2px solid var(--news-accent-gold, #FFD700);
}

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

.news-hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
  display: block;
}

.news-hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(90deg, rgba(10, 25, 47, 0.85) 0%, rgba(10, 25, 47, 0.45) 70%, rgba(75, 46, 131, 0.3) 100%);
  pointer-events: none;
}

.news-hero-content {
  position: relative;
  z-index: 2;
  padding: 3rem 1.5rem 2.5rem;
  max-width: 700px;
  width: 100%;
}

.news-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  font-size: 0.8rem;
  color: var(--color-silver, #B0BEC5);
  margin-bottom: 0.75rem;
  letter-spacing: 0.04em;
}

.news-breadcrumb-link {
  color: var(--color-silver, #B0BEC5);
  text-decoration: none;
  transition: color var(--news-transition);
}

.news-breadcrumb-link:hover,
.news-breadcrumb-link:focus-visible {
  color: var(--news-accent-gold, #FFD700);
}

.news-breadcrumb-sep {
  color: var(--color-dark-gold, #C5A55A);
  font-weight: 700;
}

.news-breadcrumb-current {
  color: var(--color-white, #F5F5F5);
  font-weight: 500;
}

.news-hero-title {
  font-family: var(--font-heading, 'Poppins', 'Helvetica Neue', Arial, sans-serif);
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  font-weight: 800;
  font-style: italic;
  color: var(--color-white, #F5F5F5);
  margin: 0 0 0.5rem;
  line-height: 1.05;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
  letter-spacing: -0.01em;
}

.news-hero-desc {
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  font-size: clamp(0.95rem, 1.2vw, 1.15rem);
  color: var(--color-silver, #B0BEC5);
  line-height: 1.6;
  margin: 0.5rem 0 0;
  max-width: 560px;
}

/* ====== 时间轴容器 ====== */
.news-timeline {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

.timeline-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 1.25rem;
  width: 2px;
  background: var(--news-line-color);
  pointer-events: none;
  z-index: 0;
}

/* ====== 板块 ====== */
.timeline-section {
  position: relative;
  z-index: 1;
  margin-bottom: 3.5rem;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1.75rem;
  padding-left: 3.2rem;
}

.section-heading {
  font-family: var(--font-heading, 'Poppins', 'Helvetica Neue', Arial, sans-serif);
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  font-weight: 700;
  font-style: italic;
  color: var(--color-white, #F5F5F5);
  margin: 0;
  line-height: 1.2;
}

/* 标签 */
.tag-function {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-dark-blue, #0A192F);
  background: var(--news-accent-green, #39FF14);
  border-radius: 3px;
  line-height: 1.4;
  flex-shrink: 0;
}

.tag-data {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-dark-blue, #0A192F);
  background: var(--news-accent-gold, #FFD700);
  border-radius: 3px;
  line-height: 1.4;
  flex-shrink: 0;
}

.tag-feedback {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-white, #F5F5F5);
  background: var(--news-accent-violet, #7B5EA7);
  border-radius: 3px;
  line-height: 1.4;
  flex-shrink: 0;
}

/* ====== 文章卡片 ====== */
.timeline-article {
  position: relative;
  padding-left: 3.2rem;
  margin-bottom: 2rem;
}

.timeline-dot {
  position: absolute;
  left: 1.15rem;
  top: 1.2rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--news-dot-color, #C5A55A);
  box-shadow: 0 0 0 3px rgba(197, 165, 90, 0.15), 0 0 12px rgba(197, 165, 90, 0.25);
  transform: translateX(-50%);
  z-index: 2;
  border: none;
}

.article-card {
  background: var(--news-card-bg);
  border: 1px solid var(--news-card-border);
  border-radius: var(--news-radius);
  box-shadow: var(--news-card-shadow);
  overflow: hidden;
  transition: transform var(--news-transition), box-shadow var(--news-transition);
  backdrop-filter: blur(2px);
}

.article-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
}

.article-img {
  width: 100%;
  height: auto;
  max-height: 260px;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--news-card-border);
}

.article-body {
  padding: 1.25rem 1.5rem 1.5rem;
}

.article-title {
  font-family: var(--font-heading, 'Poppins', 'Helvetica Neue', Arial, sans-serif);
  font-size: clamp(1.1rem, 1.6vw, 1.35rem);
  font-weight: 700;
  font-style: italic;
  color: var(--color-white, #F5F5F5);
  margin: 0 0 0.5rem;
  line-height: 1.25;
}

.article-summary {
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  font-size: clamp(0.9rem, 1vw, 1rem);
  color: var(--color-silver, #B0BEC5);
  line-height: 1.55;
  margin: 0 0 0.75rem;
}

/* details 展开收起 */
.article-details {
  display: block;
  margin-top: 0.25rem;
}

.article-summary-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--news-accent-green, #39FF14);
  cursor: pointer;
  padding: 0.2rem 0;
  border: none;
  background: transparent;
  user-select: none;
  transition: color var(--news-transition);
  list-style: none;
}

.article-summary-trigger::-webkit-details-marker {
  display: none;
}

.article-summary-trigger::before {
  content: '+';
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--news-accent-green, #39FF14);
  transition: transform var(--news-transition);
}

details[open] .article-summary-trigger::before {
  content: '–';
  transform: rotate(180deg);
}

.article-summary-trigger:hover,
.article-summary-trigger:focus-visible {
  color: var(--news-accent-gold, #FFD700);
}

.article-summary-trigger:hover::before {
  color: var(--news-accent-gold, #FFD700);
}

.article-details-content {
  padding-top: 0.75rem;
  border-top: 1px solid rgba(197, 165, 90, 0.12);
  margin-top: 0.5rem;
}

.article-details-content p {
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  font-size: clamp(0.85rem, 0.95vw, 0.95rem);
  color: var(--color-silver, #B0BEC5);
  line-height: 1.65;
  margin: 0 0 0.6rem;
}

.article-details-content p:last-child {
  margin-bottom: 0;
}

.article-link {
  color: var(--news-accent-green, #39FF14);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(57, 255, 20, 0.35);
  transition: color var(--news-transition), text-decoration-color var(--news-transition);
}

.article-link:hover,
.article-link:focus-visible {
  color: var(--news-accent-gold, #FFD700);
  text-decoration-color: var(--news-accent-gold);
}

/* ====== 底部信任声明 ====== */
.news-footer-note {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
}

.news-footer-note-text {
  font-family: var(--font-body, 'Inter', system-ui, sans-serif);
  font-size: 0.78rem;
  color: var(--color-silver, #B0BEC5);
  opacity: 0.7;
  line-height: 1.5;
  text-align: center;
  margin: 0;
  padding: 1rem 0;
  border-top: 1px solid rgba(197, 165, 90, 0.1);
}

/* ====== 返回顶部 ====== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  z-index: 99;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-violet, #4B2E83);
  color: var(--color-white, #F5F5F5);
  font-size: 1.3rem;
  font-weight: 700;
  border: 2px solid var(--news-accent-gold, #FFD700);
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  transition: opacity var(--news-transition), transform var(--news-transition), background var(--news-transition);
  opacity: 0;
  transform: scale(0.85);
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.back-to-top[data-visible] {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background: var(--news-accent-green, #39FF14);
  color: var(--color-dark-blue, #0A192F);
  border-color: var(--news-accent-green, #39FF14);
}

/* ====== 桌面端适配 ====== */
@media (min-width: 768px) {
  .news-hero {
    min-height: 420px;
  }

  .news-hero-content {
    padding: 4rem 3rem 3rem;
  }

  .news-hero-title {
    font-size: clamp(3rem, 5vw, 4.2rem);
  }

  .news-timeline {
    padding: 3rem 2.5rem 4rem;
  }

  .timeline-line {
    left: 2.5rem;
  }

  .timeline-section {
    margin-bottom: 4.5rem;
  }

  .section-header {
    padding-left: 5rem;
    gap: 1rem;
  }

  .timeline-article {
    padding-left: 5rem;
    margin-bottom: 2.5rem;
  }

  .timeline-dot {
    left: 2.4rem;
    width: 14px;
    height: 14px;
    top: 1.6rem;
    box-shadow: 0 0 0 4px rgba(197, 165, 90, 0.15), 0 0 20px rgba(197, 165, 90, 0.3);
  }

  .article-body {
    padding: 1.5rem 2rem 1.75rem;
  }

  .article-img {
    max-height: 300px;
  }

  .back-to-top {
    bottom: 2.5rem;
    right: 2.5rem;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
  }

  .news-footer-note {
    padding: 0 2.5rem 3rem;
  }
}

@media (min-width: 1024px) {
  .news-hero-content {
    padding: 5rem 4rem 3.5rem;
  }

  .news-timeline {
    padding: 3.5rem 3rem 5rem;
  }

  .timeline-line {
    left: 3rem;
  }

  .section-header {
    padding-left: 5.5rem;
  }

  .timeline-article {
    padding-left: 5.5rem;
  }

  .timeline-dot {
    left: 2.9rem;
  }

  .article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  }
}

/* ====== 窄屏安全 ====== */
@media (max-width: 480px) {
  .news-hero-content {
    padding: 2rem 1rem 1.75rem;
  }

  .news-hero-title {
    font-size: 1.9rem;
  }

  .news-timeline {
    padding: 1.5rem 0.75rem 2rem;
  }

  .timeline-line {
    left: 0.75rem;
  }

  .section-header {
    padding-left: 2.5rem;
    flex-wrap: wrap;
  }

  .timeline-article {
    padding-left: 2.5rem;
  }

  .timeline-dot {
    left: 0.65rem;
    width: 8px;
    height: 8px;
    top: 1rem;
  }

  .article-body {
    padding: 1rem 1.1rem 1.25rem;
  }

  .article-title {
    font-size: 1rem;
  }

  .back-to-top {
    bottom: 1.25rem;
    right: 1rem;
    width: 38px;
    height: 38px;
    font-size: 1.1rem;
  }
}