/* ===========================================
   page-news 专属样式 - 行业观察页
   移动端优先，含一个桌面媒体查询
   限定 .page-news 作用域
   =========================================== */
.page-news {
  --_max-content: 1040px;
  --_gap: 1.5rem;
  --_card-bg: var(--color-card);
  --_card-radius: 12px;
  --_card-border: 1px solid var(--color-gray-light);
  --_filter-gap: 0.5rem;
  --_section-mb: 2.5rem;

  display: block;
  background: var(--color-bg);
  font-family: var(--font-body);
  color: var(--color-text);
  padding: 0 1rem 2.5rem;
}

/* 包装器 */
.page-news__wrapper {
  max-width: var(--_max-content);
  margin: 0 auto;
}

/* ---- 头部区域 ---- */
.page-news__header {
  padding: 2rem 0 1.5rem;
}

.page-news__header .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.25rem;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
}

.page-news__header .breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.page-news__header .breadcrumb a:hover,
.page-news__header .breadcrumb a:focus-visible {
  border-bottom-color: currentColor;
}

.page-news__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1.2;
  color: var(--color-primary);
  margin: 0 0 0.5rem;
}

.page-news__subtitle {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.5;
}

/* ---- 筛选标签 ---- */
.page-news__filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--_filter-gap);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-gray-light);
}

.page-news__filter-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-card);
  border: 1px solid var(--color-gray-medium);
  border-radius: 999px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.page-news__filter-btn:hover,
.page-news__filter-btn:focus-visible {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(255,107,53,0.06);
}

.page-news__filter-btn.is-active {
  color: var(--color-white);
  background: var(--color-primary);
  border-color: var(--color-primary);
}

/* ---- 区块通用 ---- */
.page-news__section {
  margin-bottom: var(--_section-mb);
}

.page-news__section-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.page-news__section-head .section-number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-accent);
  line-height: 1;
}

.page-news__section-head h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--color-primary);
  margin: 0;
}

/* ---- 横幅图片 ---- */
.page-news__banner {
  margin-bottom: 1.5rem;
  border-radius: var(--_card-radius);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(11,29,58,0.08);
}

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

/* ---- 文章卡片网格 ---- */
.page-news__card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-news__card {
  display: flex;
  flex-direction: row;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--_card-bg);
  border: var(--_card-border);
  border-radius: var(--_card-radius);
  box-shadow: 0 1px 3px rgba(11,29,58,0.04);
  transition: box-shadow var(--transition), border-color var(--transition);
  cursor: default;
}

.page-news__card:hover {
  box-shadow: 0 4px 14px rgba(11,29,58,0.08);
  border-color: var(--color-accent-light);
}

/* 左侧视觉区 */
.page-news__card-visual {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-gray-light);
  border-radius: 8px;
  color: var(--color-primary);
}

.page-news__card-icon {
  width: 28px;
  height: 28px;
}

/* 右侧文字体 */
.page-news__card-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-news__card-body .tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--color-white);
  background: var(--color-accent);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.page-news__card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--color-primary);
  margin: 0;
}

.page-news__card-summary {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}

.page-news__card-detail {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0.25rem 0 0;
  padding-top: 0.25rem;
  border-top: 1px dashed var(--color-gray-light);
}

.page-news__card-toggle {
  align-self: flex-start;
  margin-top: 0.4rem;
  font-size: 0.78rem;
  padding: 0.3rem 0.8rem;
  background: transparent;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.page-news__card-toggle:hover,
.page-news__card-toggle:focus-visible {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ---- 桌面端 >= 768px ---- */
@media (min-width: 768px) {
  .page-news {
    padding: 0 2rem 3.5rem;
  }

  .page-news__title {
    font-size: 2.75rem;
  }

  .page-news__subtitle {
    font-size: 1.05rem;
  }

  .page-news__card-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .page-news__card {
    flex-direction: column;
    padding: 1.5rem;
  }

  .page-news__card-visual {
    width: 64px;
    height: 64px;
  }

  .page-news__card-icon {
    width: 36px;
    height: 36px;
  }

  .page-news__section-head .section-number {
    font-size: 1.8rem;
  }

  .page-news__section-head h2 {
    font-size: 1.65rem;
  }

  .page-news__filters {
    gap: 0.75rem;
  }

  .page-news__filter-btn {
    padding: 0.6rem 1.4rem;
    font-size: 0.9rem;
  }
}

/* 大桌面上三列 */
@media (min-width: 1024px) {
  .page-news {
    padding: 0 2rem 4rem;
  }
  .page-news__card-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
  .page-news__section-head .section-number {
    font-size: 2rem;
  }
  .page-news__section-head h2 {
    font-size: 1.8rem;
  }
}
</PAGE_CSS>