/* ===== 页面专属 CSS：page-news （行业观察） ===== */
.page-news {
  --color-primary: #8B0000;
  --color-accent-gold: #FFD700;
  --color-accent-neon: #00BFFF;
  --color-bg-dark: #0A0A0A;
  --color-bg-medium: #1A1A1A;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #B0B0B0;
  --font-heading: 'Poppins', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', sans-serif;
  --font-tech: 'Orbitron', 'Courier New', monospace;
  --header-height: 60px;

  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg-dark);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
}

/* ===== 左侧索引栏 ===== */
.page-news__sidebar {
  display: none;
}

.page-news__index {
  padding: 2rem 1rem;
}

.page-news__index-title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-accent-gold);
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-accent-gold);
  padding-bottom: 0.5rem;
}

.page-news__index-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-news__index-link {
  display: block;
  padding: 0.6rem 0;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s, padding-left 0.2s;
  position: relative;
}

.page-news__index-link::before {
  content: "▸";
  color: var(--color-accent-gold);
  opacity: 0;
  position: absolute;
  left: -1rem;
  transition: opacity 0.2s, left 0.2s;
}

.page-news__index-link:hover,
.page-news__index-link:focus-visible {
  color: var(--color-accent-gold);
  padding-left: 1rem;
}

.page-news__index-link:hover::before,
.page-news__index-link:focus-visible::before {
  opacity: 1;
  left: 0;
}

.page-news__quick-actions {
  padding: 1rem;
  border-top: 1px solid var(--color-bg-medium);
}

.page-news__quick-actions .btn {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--color-primary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-accent-gold);
  font-family: var(--font-tech);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  transition: background 0.3s, border-color 0.3s;
}

.page-news__quick-actions .btn:hover,
.page-news__quick-actions .btn:focus-visible {
  background: var(--color-accent-gold);
  color: var(--color-bg-dark);
  border-color: var(--color-accent-gold);
}

/* ===== 主内容区 ===== */
.page-news__content {
  flex: 1;
  padding: 2rem 1rem;
  max-width: var(--content-max-width, 1200px);
  margin: 0 auto;
  width: 100%;
}

/* ===== 面包屑 ===== */
.page-news .breadcrumb {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.page-news .breadcrumb a {
  color: var(--color-accent-neon);
  text-decoration: none;
}

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

/* ===== 首屏标题区 ===== */
.page-news__hero {
  margin-bottom: 3rem;
}

.page-news__hero-heading {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1.1;
  margin: 0 0 0.5rem;
  background: linear-gradient(135deg, var(--color-accent-gold), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-news__hero-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0;
  font-weight: 300;
}

/* ===== 区块通用 ===== */
.page-news__section {
  margin-bottom: 4rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-bg-medium);
  transition: opacity 0.5s;
}

.page-news__section.is-visible {
  opacity: 1;
}

.page-news__section-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.page-news__icon-head {
  width: 48px;
  height: 48px;
  object-fit: contain;
  filter: drop-shadow(0 0 4px var(--color-accent-neon));
}

.page-news__section-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 4px;
  color: var(--color-text-primary);
  margin: 0;
  position: relative;
}

.page-news__section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-accent-gold);
  margin-top: 0.3rem;
}

/* ===== 时间线 ===== */
.page-news__timeline {
  position: relative;
  padding-left: 2rem;
}

.page-news__timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-accent-gold);
  opacity: 0.4;
}

.page-news__timeline-item {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 1.5rem;
}

.page-news__timeline-item::before {
  content: "";
  position: absolute;
  left: -1.3rem;
  top: 0.6rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-accent-gold);
  border: 2px solid var(--color-bg-dark);
  box-shadow: 0 0 0 2px var(--color-accent-gold);
}

.page-news__timeline-time {
  display: inline-block;
  font-family: var(--font-tech);
  font-size: 0.75rem;
  letter-spacing: 2px;
  color: var(--color-accent-neon);
  margin-bottom: 0.25rem;
}

.page-news__timeline-card {
  background: var(--color-bg-medium);
  padding: 1rem 1.25rem;
  border-radius: 4px;
  border-left: 3px solid var(--color-primary-light);
  cursor: pointer;
  transition: background 0.3s, transform 0.2s, box-shadow 0.3s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.page-news__timeline-card:hover,
.page-news__timeline-card:focus-visible {
  background: rgba(139, 0, 0, 0.15);
  transform: translateX(4px);
  box-shadow: 0 4px 12px rgba(255, 215, 0, 0.2);
}

.page-news__card-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.3rem;
  color: var(--color-text-primary);
}

.page-news__card-text {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* ===== 行业观察网格 ===== */
.page-news__obs-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-news__obs-card {
  background: var(--color-bg-medium);
  border-radius: 4px;
  overflow: hidden;
  padding: 1rem;
  transition: transform 0.3s, box-shadow 0.3s;
  cursor: default;
}

.page-news__obs-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(255, 215, 0, 0.1);
}

.page-news__obs-img {
  width: 100%;
  height: auto;
  max-height: 300px;
  object-fit: cover;
  border-radius: 2px;
  margin-bottom: 0.75rem;
}

.page-news__obs-placeholder {
  width: 100%;
  height: 180px;
  background: linear-gradient(135deg, var(--color-bg-medium), var(--color-primary));
  border-radius: 2px;
  margin-bottom: 0.75rem;
}

.page-news__tag {
  display: inline-block;
  font-family: var(--font-tech);
  font-size: 0.7rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--color-accent-neon);
  color: var(--color-accent-neon);
  margin-top: 0.5rem;
  background: rgba(0, 191, 255, 0.1);
}

/* ===== 推荐卡片网格 ===== */
.page-news__recommend-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-news__recommend-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-medium);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
  border: 1px solid transparent;
}

.page-news__recommend-card:hover,
.page-news__recommend-card:focus-visible {
  transform: scale(1.02);
  border-color: var(--color-accent-gold);
  box-shadow: 0 4px 16px rgba(255, 215, 0, 0.15);
}

.page-news__rec-img {
  width: 100%;
  height: auto;
  object-fit: cover;
  max-height: 160px;
}

.page-news__rec-body {
  padding: 1rem;
}

.page-news__rec-body .page-news__card-title {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.page-news__rec-body .page-news__card-text {
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.page-news__rec-link {
  display: inline-block;
  font-family: var(--font-tech);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-accent-gold);
  text-decoration: none;
  transition: color 0.2s;
}

.page-news__rec-link:hover {
  color: var(--color-accent-neon);
  text-decoration: underline;
}

/* ===== 背景纹理 ===== */
.page-news__bg-texture {
  position: relative;
  overflow: hidden;
  margin: 2rem -1rem -2rem;
}

.page-news__texture-img {
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: cover;
  opacity: 0.2;
  display: block;
}

/* ===== 交互高亮 ===== */
.page-news__section[data-scroll-section].is-visible {
  border-left: 3px solid var(--color-accent-gold);
  padding-left: 1.2rem;
  transition: border-color 0.5s, padding-left 0.5s;
}

/* ===== 响应式：平板及以上 ===== */
@media (min-width: 768px) {
  .page-news {
    flex-direction: row;
    position: relative;
  }

  .page-news__sidebar {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 240px;
    height: calc(100vh - var(--header-height));
    background: var(--color-bg-medium);
    border-right: 1px solid var(--color-bg-dark);
    z-index: 10;
    overflow-y: auto;
  }

  .page-news__content {
    margin-left: 240px;
    padding: 3rem 2.5rem;
    max-width: var(--content-max-width, 1200px);
  }

  .page-news__hero-heading {
    font-size: 3rem;
  }

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

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

  .page-news__bg-texture {
    margin: 3rem -2.5rem -3rem;
  }

  .page-news__timeline {
    padding-left: 3rem;
  }

  .page-news__timeline-item {
    padding-left: 2rem;
  }

  .page-news__timeline-item::before {
    left: -1.7rem;
  }

  .page-news__recommend-card {
    flex-direction: row;
  }

  .page-news__rec-img {
    width: 200px;
    height: 120px;
    flex-shrink: 0;
  }

  .page-news__rec-body {
    flex: 1;
  }
}

@media (min-width: 1024px) {
  .page-news__hero-heading {
    font-size: 3.5rem;
  }

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

  .page-news__obs-grid {
    gap: 2.5rem;
  }
}