/* ===== 页面专属：最新动态 ===== */
.page-news {
  --pn-spacing-xs: 8px;
  --pn-spacing-sm: 16px;
  --pn-spacing-md: 24px;
  --pn-spacing-lg: 40px;
  --pn-spacing-xl: 60px;
  --pn-card-radius: 6px;
  --pn-number-size: 52px;
  --pn-timeline-dot: 14px;
  --pn-timeline-line: 3px;
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

/* ===== Hero 区 ===== */
.page-news__hero {
  padding: var(--pn-spacing-lg) var(--container-padding) var(--pn-spacing-xl);
  border-bottom: 2px solid var(--color-accent-gold);
  margin-bottom: var(--pn-spacing-lg);
  position: relative;
}
.page-news__hero::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: var(--container-padding);
  width: 80px;
  height: 4px;
  background: var(--color-primary);
}
.page-news__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--pn-spacing-xs);
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--pn-spacing-sm);
  letter-spacing: 0.02em;
}
.page-news__breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}
.page-news__breadcrumb a:hover {
  color: var(--color-primary);
}
.page-news__breadcrumb-sep {
  color: var(--color-accent-gold);
  font-weight: 700;
}
.page-news__breadcrumb-current {
  color: var(--color-text);
  font-weight: 600;
}
.page-news__title {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.05;
  color: var(--color-text);
  margin: 0 0 var(--pn-spacing-xs);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.page-news__subtitle {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-accent-gold);
  margin: 0;
  letter-spacing: 0.06em;
  font-weight: 400;
}

/* ===== 共享章节包装 ===== */
.page-news__section {
  padding: var(--pn-spacing-lg) var(--container-padding) var(--pn-spacing-xl);
  position: relative;
}
.page-news__section + .page-news__section {
  border-top: 1px solid var(--color-border);
}
.page-news__section-header {
  display: flex;
  align-items: baseline;
  gap: var(--pn-spacing-sm);
  margin-bottom: var(--pn-spacing-lg);
}
.page-news__section-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-primary);
  letter-spacing: -0.03em;
  flex-shrink: 0;
}
.page-news__section-heading {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ===== 卡片网格（本月更新档案） ===== */
.page-news__card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--pn-spacing-lg);
  margin-bottom: var(--pn-spacing-lg);
}

/* ===== 数据卡片 ===== */
.page-news__card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--pn-card-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.3, 1), box-shadow 0.35s ease;
  cursor: default;
}
.page-news__card:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 32px rgba(220, 20, 60, 0.15), 0 0 0 1px var(--color-primary);
}
.page-news__card-number {
  position: absolute;
  top: var(--pn-spacing-sm);
  left: var(--pn-spacing-sm);
  z-index: 2;
  font-family: var(--font-heading);
  font-size: var(--pn-number-size);
  font-weight: 900;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.2;
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.04em;
}
.page-news__card-header {
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}
.page-news__card-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 10;
  border-bottom: 2px solid var(--color-border);
  transition: transform 0.4s ease;
}
.page-news__card:hover .page-news__card-img {
  transform: scale(1.03);
}
.page-news__tag {
  position: absolute;
  bottom: var(--pn-spacing-sm);
  left: var(--pn-spacing-sm);
  background: var(--color-primary);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 12px;
  border-radius: 2px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid rgba(255,255,255,0.1);
}
.page-news__card-body {
  padding: var(--pn-spacing-sm) var(--pn-spacing-md) var(--pn-spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--pn-spacing-xs);
}
.page-news__card-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.page-news__card-summary {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ===== 操作按钮组 ===== */
.page-news__archive-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--pn-spacing-sm);
  margin-top: var(--pn-spacing-sm);
}
.page-news__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 10px 28px;
  border-radius: 3px;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: background 0.25s, color 0.25s, border-color 0.25s;
  background: var(--color-primary);
  color: var(--color-text);
  border: 2px solid var(--color-primary);
  cursor: pointer;
}
.page-news__btn:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}
.page-news__btn--outline {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}
.page-news__btn--outline:hover {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-text-secondary);
}
.page-news__btn--accent {
  background: var(--color-accent-gold);
  color: var(--color-bg);
  border-color: var(--color-accent-gold);
}
.page-news__btn--accent:hover {
  background: #e6c200;
  border-color: #e6c200;
  color: var(--color-bg);
}

/* ===== 研究板（检索帮助） ===== */
.page-news__study-board {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--pn-card-radius);
  padding: var(--pn-spacing-lg);
}
.page-news__study-summary {
  display: flex;
  flex-direction: column;
  gap: var(--pn-spacing-lg);
  align-items: flex-start;
}
.page-news__study-image-wrap {
  flex-shrink: 0;
  width: 100%;
  max-width: 300px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}
.page-news__study-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-news__study-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--pn-spacing-md);
  align-items: flex-start;
}
.page-news__study-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  line-height: 1.7;
  margin: 0;
  max-width: 560px;
}
.page-news__code {
  font-family: var(--font-mono);
  background: rgba(0, 191, 255, 0.12);
  color: var(--color-accent-blue);
  padding: 2px 10px;
  border-radius: 3px;
  font-size: 0.9em;
  border: 1px solid rgba(0, 191, 255, 0.25);
}

/* ===== 时间线（更新历史） ===== */
.page-news__timeline {
  position: relative;
  padding-left: calc(var(--pn-timeline-dot) + var(--pn-spacing-md));
  display: flex;
  flex-direction: column;
  gap: var(--pn-spacing-lg);
}
.page-news__timeline::before {
  content: '';
  position: absolute;
  left: calc(var(--pn-timeline-dot) / 2);
  top: 0;
  bottom: 0;
  width: var(--pn-timeline-line);
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent-gold));
  border-radius: 2px;
}
.page-news__timeline-item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: var(--pn-spacing-sm);
  transition: opacity 0.3s;
}
.page-news__timeline-marker {
  position: absolute;
  left: calc(-1 * var(--pn-timeline-dot) - var(--pn-spacing-md) + var(--pn-timeline-dot) / 2);
  top: 4px;
  width: var(--pn-timeline-dot);
  height: var(--pn-timeline-dot);
  border-radius: 50%;
  background: var(--color-accent-gold);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-primary);
  z-index: 1;
}
.page-news__timeline-date {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.page-news__timeline-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--pn-card-radius);
  padding: var(--pn-spacing-sm) var(--pn-spacing-md);
  transition: box-shadow 0.3s;
}
.page-news__timeline-content:hover {
  box-shadow: 0 4px 16px rgba(220, 20, 60, 0.08);
}
.page-news__timeline-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.page-news__timeline-desc {
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* ===== 桌面端（≥768px） ===== */
@media (min-width: 768px) {
  .page-news__hero {
    padding: var(--pn-spacing-xl) var(--container-padding) var(--pn-spacing-xl);
  }
  .page-news__title {
    font-size: 4.8rem;
  }
  .page-news__subtitle {
    font-size: 1.15rem;
  }
  .page-news__section {
    padding: var(--pn-spacing-xl) var(--container-padding) var(--pn-spacing-xl);
  }
  .page-news__section-number {
    font-size: 4rem;
  }
  .page-news__section-heading {
    font-size: 2rem;
  }

  /* 三列卡片 */
  .page-news__card-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--pn-spacing-md);
  }
  .page-news__card-number {
    font-size: 64px;
    opacity: 0.15;
  }
  .page-news__card-body {
    padding: var(--pn-spacing-sm) var(--pn-spacing-md) var(--pn-spacing-md);
  }
  .page-news__card-title {
    font-size: 1.25rem;
  }

  /* 研究板水平布局 */
  .page-news__study-summary {
    flex-direction: row;
    align-items: center;
  }
  .page-news__study-image-wrap {
    width: 280px;
  }
  .page-news__study-desc {
    font-size: 1.05rem;
  }

  /* 时间线 */
  .page-news__timeline {
    padding-left: calc(var(--pn-timeline-dot) + var(--pn-spacing-xl));
  }
  .page-news__timeline-marker {
    left: calc(-1 * var(--pn-timeline-dot) - var(--pn-spacing-xl) + var(--pn-timeline-dot) / 2);
  }
  .page-news__timeline-content {
    padding: var(--pn-spacing-md) var(--pn-spacing-lg);
  }
  .page-news__timeline-title {
    font-size: 1.15rem;
  }
  .page-news__timeline-desc {
    font-size: 0.95rem;
  }
}

/* ===== 大桌面端（≥1024px） ===== */
@media (min-width: 1024px) {
  .page-news__title {
    font-size: 5.6rem;
  }
  .page-news__section-number {
    font-size: 4.8rem;
  }
  .page-news__section-heading {
    font-size: 2.2rem;
  }
  .page-news__card-grid {
    gap: var(--pn-spacing-lg);
  }
  .page-news__card-number {
    font-size: 76px;
  }
}