/* ===== 页面专属样式：品牌日志 ===== */
.page-news {
  position: relative;
  min-height: 100vh;
  color: var(--color-text);
  font-family: var(--font-body);
  overflow-x: hidden;
}
/* ---------- 背景纹理 ---------- */
.news-bg-container {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.15;
  mix-blend-mode: overlay;
}
.news-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}
/* ---------- 封面区 ---------- */
.news-cover {
  position: relative;
  z-index: 1;
  padding: 2rem 1.25rem 2.5rem;
  border-bottom: var(--border-thick) solid var(--color-accent);
  background: linear-gradient(135deg, rgba(10,10,26,0.92) 0%, rgba(26,26,46,0.88) 100%);
  margin-bottom: 2rem;
}
.cover-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}
.cover-breadcrumb {
  font-size: 0.8rem;
  font-family: var(--font-heading);
  color: var(--color-secondary);
  letter-spacing: 0.08em;
  margin: 0 0 0.25rem;
}
.cover-breadcrumb a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition);
}
.cover-breadcrumb a:hover,
.cover-breadcrumb a:focus-visible {
  color: var(--color-accent);
}
.cover-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(2.4rem, 8vw, 4rem);
  line-height: 1.05;
  color: var(--color-text);
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  text-shadow: 0 0 40px rgba(255,42,42,0.25), 0 0 80px rgba(0,191,255,0.10);
}
.cover-lead {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 680px;
  margin: 0;
  border-left: 3px solid var(--color-primary);
  padding-left: 1rem;
}
.cover-index {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-top: 0.5rem;
}
.index-item {
  flex: 0 0 auto;
}
.index-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border: 1px solid rgba(255,215,0,0.3);
  border-radius: var(--radius-sm);
  background: rgba(255,215,0,0.06);
  transition: all var(--transition);
}
.index-link:hover,
.index-link:focus-visible {
  border-color: var(--color-accent);
  background: rgba(255,215,0,0.14);
  color: var(--color-accent);
  box-shadow: 0 0 20px rgba(255,215,0,0.10);
}
.index-num {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.85em;
}
/* ---------- 主体内容 ---------- */
.news-body {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}
/* ---------- 区块标题 ---------- */
.section-header {
  margin-bottom: 1.5rem;
}
.section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  color: var(--color-text);
  margin: 0 0 0.4rem;
  display: inline-block;
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 0.3rem;
}
.section-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin: 0.4rem 0 0;
  max-width: 600px;
  line-height: 1.6;
}
/* ---------- 时间线容器 ---------- */
.timeline-section {
  position: relative;
}
.timeline-container {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
  padding-left: 2.2rem;
}
.timeline-line {
  position: absolute;
  left: 1.1rem;
  top: 0.8rem;
  bottom: 0.8rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-secondary), var(--color-primary), transparent);
  pointer-events: none;
  opacity: 0.6;
}
/* ---------- 时间线条目 ---------- */
.timeline-item {
  position: relative;
  display: flex;
  gap: 1.25rem;
  scroll-margin-top: 2rem;
}
.tl-node {
  position: relative;
  z-index: 2;
  flex: 0 0 2.2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  margin-left: -2.2rem;
}
.tl-dot {
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-secondary);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-secondary), 0 0 20px rgba(0,191,255,0.3);
  flex-shrink: 0;
  transition: all var(--transition);
  cursor: pointer;
}
.timeline-item[data-active] .tl-dot {
  background: var(--color-primary);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent), 0 0 30px rgba(255,42,42,0.4);
  transform: scale(1.2);
}
.tl-node-icon {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  opacity: 0.7;
  transition: opacity var(--transition);
  display: none;
}
.timeline-item:first-child .tl-node-icon {
  display: block;
}
.timeline-item:hover .tl-node-icon {
  opacity: 1;
}
/* ---------- 时间线卡片 ---------- */
.tl-card {
  flex: 1;
  min-width: 0;
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
  border: var(--border-thick) solid rgba(0,191,255,0.15);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-strong);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.tl-card:hover {
  border-color: rgba(0,191,255,0.4);
  box-shadow: var(--shadow-glow);
}
.timeline-item[data-active] .tl-card {
  border-color: rgba(255,42,42,0.4);
  box-shadow: 0 0 30px rgba(255,42,42,0.08), var(--shadow-strong);
}
.tl-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}
.tl-tag {
  font-size: 0.7rem;
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  background: rgba(255,215,0,0.10);
  padding: 0.15rem 0.6rem;
  border-radius: 2px;
  border: 1px solid rgba(255,215,0,0.15);
}
.tl-card-body {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}
.tl-summary {
  margin: 0 0 0.5rem;
}
.tl-details {
  margin-top: 0.4rem;
}
.tl-details-summary {
  display: inline-block;
  cursor: pointer;
  font-size: 0.85rem;
  font-family: var(--font-heading);
  color: var(--color-accent);
  background: rgba(255,215,0,0.06);
  border: 1px solid rgba(255,215,0,0.2);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.8rem;
  transition: all var(--transition);
  user-select: none;
}
.tl-details-summary:hover,
.tl-details-summary:focus-visible {
  background: rgba(255,215,0,0.14);
  border-color: var(--color-accent);
  box-shadow: 0 0 15px rgba(255,215,0,0.08);
}
.tl-details-content {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 0.9rem;
  line-height: 1.7;
}
.tl-details-content p {
  margin: 0 0 0.75rem;
}
.tl-compare-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,215,0,0.12);
  margin-top: 0.5rem;
  display: block;
}
/* ---------- 功能观察 ---------- */
.observations-section {
  position: relative;
}
.observations-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.obs-card {
  background: var(--color-surface);
  border: var(--border-thick) solid rgba(255,42,42,0.12);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-strong);
  transition: border-color var(--transition), box-shadow var(--transition);
  overflow: hidden;
}
.obs-card:hover {
  border-color: rgba(255,42,42,0.35);
  box-shadow: var(--shadow-glow);
}
.obs-card-inner {
  padding: 1.5rem;
}
.obs-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  margin: 0 0 0.75rem;
  letter-spacing: 0.02em;
}
.obs-body {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}
.obs-text {
  margin: 0 0 0.75rem;
}
.obs-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0,191,255,0.10);
  display: block;
  margin-top: 0.5rem;
}
/* ---------- 返回顶部 ---------- */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 1.5rem;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-secondary);
  color: var(--color-secondary);
  box-shadow: 0 0 20px rgba(0,191,255,0.15);
  transition: all var(--transition);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  text-decoration: none;
}
.scroll-top[data-visible] {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.scroll-top:hover,
.scroll-top:focus-visible {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text);
  box-shadow: 0 0 30px rgba(255,42,42,0.25);
  transform: translateY(-3px);
}
/* ---------- 桌面端响应式 ---------- */
@media (min-width: 768px) {
  .news-cover {
    padding: 3rem 2.5rem 3.5rem;
    margin-bottom: 3rem;
  }
  .cover-inner {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-end;
    gap: 2rem;
  }
  .cover-text {
    flex: 1 1 55%;
  }
  .cover-index {
    flex: 0 0 auto;
    justify-content: flex-end;
    gap: 1rem 1.5rem;
  }
  .cover-title {
    font-size: clamp(3rem, 6vw, 4rem);
  }
  .news-body {
    padding: 0 2.5rem 5rem;
    gap: 4rem;
  }
  .timeline-container {
    padding-left: 3rem;
    gap: 2.75rem;
  }
  .timeline-line {
    left: 1.5rem;
  }
  .tl-node {
    flex: 0 0 3rem;
    margin-left: -3rem;
  }
  .tl-dot {
    width: 18px;
    height: 18px;
  }
  .tl-node-icon {
    width: 48px;
    height: 48px;
  }
  .tl-card {
    padding: 1.5rem 2rem;
  }
  .observations-grid {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
  }
  .obs-card-inner {
    padding: 2rem;
  }
  .obs-title {
    font-size: 1.25rem;
  }
  .scroll-top {
    bottom: 2.5rem;
    right: 2.5rem;
    width: 48px;
    height: 48px;
  }
}
@media (min-width: 1200px) {
  .cover-text {
    flex: 1 1 60%;
  }
  .cover-title {
    font-size: 4rem;
  }
  .observations-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
/* ---------- 移动端微调 ---------- */
@media (max-width: 479px) {
  .news-cover {
    padding: 1.5rem 1rem 2rem;
  }
  .cover-index {
    gap: 0.5rem;
  }
  .index-link {
    font-size: 0.8rem;
    padding: 0.3rem 0.6rem;
  }
  .tl-card {
    padding: 1rem 1.25rem;
  }
  .tl-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }
  .obs-card-inner {
    padding: 1.25rem;
  }
  .scroll-top {
    bottom: 1.25rem;
    right: 1rem;
    width: 40px;
    height: 40px;
  }
}