/* page-news 专属样式 — 内容观察页 */
.page-news {
  --sidebar-width: 240px;
  --sidebar-gap: 2rem;
  --card-radius: 12px;
  --tag-orange-bg: #FFF0E8;
  --tag-green-bg: #E6FCF4;
  --tag-yellow-bg: #FFF8E1;
  --card-shadow: 0 2px 12px rgba(10, 37, 64, 0.08);
  --card-shadow-hover: 0 6px 24px rgba(10, 37, 64, 0.14);
  display: block;
  background: var(--color-bg-light, #F9F9F9);
}

/* ---------- 布局容器 ---------- */
.page-news .news-layout {
  display: flex;
  flex-direction: column;
  max-width: var(--container-width, 1200px);
  margin: 0 auto;
  padding: 1rem 1rem 3rem;
  gap: var(--sidebar-gap);
}

/* ---------- 侧边栏 ---------- */
.page-news .news-sidebar {
  order: -1;
  flex-shrink: 0;
}

.page-news .sidebar-inner {
  background: var(--color-dark-blue, #0A2540);
  border-radius: 16px;
  padding: 1.5rem 1.25rem;
  color: var(--color-text-light, #FFFFFF);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-news .sidebar-heading {
  font-family: var(--font-heading, 'Inter Tight', sans-serif);
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.02em;
  color: var(--color-orange, #FF6B35);
  border-bottom: 2px solid rgba(255, 107, 53, 0.3);
  padding-bottom: 0.5rem;
}

.page-news .sidebar-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-news .sidebar-link {
  display: block;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
  position: relative;
}

.page-news .sidebar-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--color-orange, #FF6B35);
  border-radius: 2px;
  transition: height var(--transition-medium, 0.35s ease);
}

.page-news .sidebar-link:hover,
.page-news .sidebar-link:focus-visible {
  background: rgba(255, 107, 53, 0.15);
  color: #FFFFFF;
}

.page-news .sidebar-link:hover::before,
.page-news .sidebar-link:focus-visible::before {
  height: 60%;
}

/* 通过 :target 高亮对应链接（渐进增强） */
.page-news #brand-updates:target ~ .news-sidebar .sidebar-nav a[href="#brand-updates"],
.page-news #usage-guide:target ~ .news-sidebar .sidebar-nav a[href="#usage-guide"],
.page-news #data-analysis:target ~ .news-sidebar .sidebar-nav a[href="#data-analysis"] {
  background: rgba(255, 107, 53, 0.2);
  color: #FFFFFF;
}

.page-news .sidebar-decor {
  margin-top: auto;
  border-radius: 10px;
  overflow: hidden;
  line-height: 0;
}

.page-news .sidebar-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 200px;
  margin: 0 auto;
  object-fit: cover;
  border-radius: 8px;
}

.page-news .sidebar-top {
  display: inline-block;
  color: var(--color-muted, #7A8B99);
  font-size: 0.8125rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.25rem 0;
  transition: color var(--transition-fast, 0.2s ease);
}

.page-news .sidebar-top:hover {
  color: var(--color-orange, #FF6B35);
}

/* ---------- 主内容区 ---------- */
.page-news .news-content {
  flex: 1;
  min-width: 0;
}

.page-news .news-title {
  font-family: var(--font-heading, 'Inter Tight', sans-serif);
  font-size: 2rem;
  font-weight: 700;
  margin: 0.75rem 0 0.25rem;
  color: var(--color-text-dark, #1A1A1A);
  letter-spacing: -0.01em;
}

.page-news .news-subtitle {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.9375rem;
  color: var(--color-muted, #7A8B99);
  margin: 0 0 1.5rem;
  font-weight: 400;
}

/* ---------- 移动端快速目录 ---------- */
.page-news .mobile-index {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 0 0 1rem;
  margin-bottom: 0.5rem;
}

.page-news .mobile-index::-webkit-scrollbar {
  display: none;
}

.page-news .mobile-index-link {
  flex-shrink: 0;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  background: var(--color-card, #FFFFFF);
  color: var(--color-dark-blue, #0A2540);
  text-decoration: none;
  box-shadow: 0 1px 4px rgba(10, 37, 64, 0.08);
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
  white-space: nowrap;
}

.page-news .mobile-index-link:hover,
.page-news .mobile-index-link:focus-visible {
  background: var(--color-orange, #FF6B35);
  color: #FFFFFF;
}

/* ---------- 区域 ---------- */
.page-news .news-section {
  margin-bottom: 2.5rem;
  scroll-margin-top: 6rem;
}

.page-news .section-title {
  font-family: var(--font-heading, 'Inter Tight', sans-serif);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 0.25rem;
  color: var(--color-text-dark, #1A1A1A);
  position: relative;
  display: inline-block;
}

.page-news .section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--color-orange, #FF6B35);
  border-radius: 2px;
  margin-top: 4px;
}

.page-news .section-desc {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.9375rem;
  color: var(--color-muted, #7A8B99);
  margin: 0 0 1.25rem;
  font-weight: 400;
}

/* ---------- 卡片 (details/summary) ---------- */
.page-news .news-card {
  display: block;
  background: var(--color-card, #FFFFFF);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  margin-bottom: 1rem;
  overflow: hidden;
  transition: box-shadow var(--transition-medium, 0.35s ease);
  border: 1px solid rgba(10, 37, 64, 0.06);
}

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

.page-news .card-summary {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  cursor: pointer;
  list-style: none;
  -webkit-user-select: none;
  user-select: none;
  transition: background var(--transition-fast, 0.2s ease);
}

.page-news .card-summary::-webkit-details-marker {
  display: none;
}

.page-news .card-summary:hover {
  background: rgba(255, 107, 53, 0.04);
}

.page-news .card-img {
  flex-shrink: 0;
  width: 120px;
  height: 75px;
  object-fit: cover;
  border-radius: 8px;
  display: none;
}

.page-news .card-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-news .card-info--full {
  flex: 1;
}

.page-news .card-tag {
  display: inline-flex;
  align-self: flex-start;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.page-news .tag-orange {
  background: var(--tag-orange-bg);
  color: var(--color-orange, #FF6B35);
}

.page-news .tag-green {
  background: var(--tag-green-bg);
  color: var(--color-green, #06D6A0);
}

.page-news .tag-yellow {
  background: var(--tag-yellow-bg);
  color: #B8860B;
}

.page-news .card-title {
  font-family: var(--font-heading, 'Inter Tight', sans-serif);
  font-size: 1.0625rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-text-dark, #1A1A1A);
  line-height: 1.3;
}

.page-news .card-summary-text {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.875rem;
  color: var(--color-muted, #7A8B99);
  margin: 0;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.page-news .card-toggle {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--color-orange, #FF6B35);
  background: var(--tag-orange-bg);
  border-radius: 50%;
  transition: transform var(--transition-medium, 0.35s ease), background var(--transition-medium, 0.35s ease);
  line-height: 1;
  margin-top: 0.25rem;
}

/* 展开状态 */
.page-news .news-card[open] .card-toggle {
  transform: rotate(45deg);
  background: var(--color-orange, #FF6B35);
  color: #FFFFFF;
}

.page-news .news-card[open] .card-summary {
  border-bottom: 1px solid rgba(10, 37, 64, 0.06);
}

/* 详情区域 */
.page-news .card-detail {
  padding: 1rem 1rem 1.25rem;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-dark, #1A1A1A);
}

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

.page-news .card-detail a {
  color: var(--color-orange, #FF6B35);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
  transition: color var(--transition-fast, 0.2s ease);
}

.page-news .card-detail a:hover {
  color: var(--color-dark-blue, #0A2540);
}

/* ---------- 目标高亮反馈 ---------- */
.page-news .news-section:target {
  animation: sectionPulse 1.2s ease;
}

@keyframes sectionPulse {
  0%, 100% { opacity: 1; }
  30% { opacity: 0.85; }
  60% { opacity: 1; }
}

/* ---------- 响应式：桌面端 >=768px ---------- */
@media (min-width: 768px) {
  .page-news .news-layout {
    flex-direction: row;
    align-items: flex-start;
    padding: 2rem 1.5rem 4rem;
  }

  .page-news .news-sidebar {
    position: sticky;
    top: calc(var(--header-top-height, 56px) + var(--header-bottom-height, 48px) + 1.5rem);
    width: var(--sidebar-width);
    order: 0;
  }

  .page-news .sidebar-inner {
    padding: 1.75rem 1.5rem;
    min-height: 360px;
  }

  .page-news .sidebar-heading {
    font-size: 1.25rem;
  }

  .page-news .sidebar-link {
    font-size: 1rem;
    padding: 0.5rem 0.75rem;
  }

  .page-news .mobile-index {
    display: none;
  }

  .page-news .news-content {
    width: calc(100% - var(--sidebar-width) - var(--sidebar-gap));
  }

  .page-news .news-title {
    font-size: 2.5rem;
    margin-top: 0;
  }

  .page-news .news-subtitle {
    font-size: 1rem;
  }

  .page-news .news-section {
    margin-bottom: 3rem;
    scroll-margin-top: 7rem;
  }

  .page-news .section-title {
    font-size: 1.75rem;
  }

  .page-news .card-summary {
    padding: 1.25rem 1.5rem;
    gap: 1.25rem;
  }

  .page-news .card-img {
    display: block;
    width: 160px;
    height: 100px;
  }

  .page-news .card-title {
    font-size: 1.125rem;
  }

  .page-news .card-detail {
    padding: 1.25rem 1.5rem 1.5rem;
    font-size: 0.9375rem;
  }

  .page-news .card-info--full {
    padding-left: 0;
  }
}

/* ---------- 桌面大屏 >=1024px ---------- */
@media (min-width: 1024px) {
  .page-news .news-layout {
    padding: 2.5rem 2rem 5rem;
    gap: 3rem;
  }

  .page-news .sidebar-inner {
    padding: 2rem 1.75rem;
  }

  .page-news .card-img {
    width: 200px;
    height: 125px;
  }

  .page-news .news-title {
    font-size: 2.75rem;
  }
}

/* ---------- 动效：减少运动偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-news .news-card,
  .page-news .card-toggle,
  .page-news .sidebar-link {
    transition: none !important;
  }

  .page-news .news-card[open] .card-toggle {
    transform: none;
  }

  .page-news .news-section:target {
    animation: none;
  }
}