/* ==============================================
   页面专属CSS：.page-news（更新说明页）
   限定在 .page-news 作用域，避免污染共享区域
   移动端优先 + 桌面媒体查询
   ============================================== */
.page-news {
  --news-bg-edge: var(--color-dark);
  --news-bg-card: var(--color-light);
  --news-accent: var(--color-red);
  --news-line-color: var(--color-silver);
  --timeline-dot-size: 16px;
  --timeline-line-width: 3px;
}

/* 内部容器复用全局 */
.page-news .page-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* ---- 面包屑 ---- */
.page-news .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 0 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-silver);
}
.page-news .breadcrumb__link {
  color: var(--color-gold);
  text-decoration: none;
  transition: color var(--transition);
}
.page-news .breadcrumb__link:hover,
.page-news .breadcrumb__link:focus-visible {
  color: var(--color-red);
  text-decoration: underline;
}
.page-news .breadcrumb__item--active {
  color: var(--color-text);
  font-weight: 600;
}
.page-news .breadcrumb__sep {
  user-select: none;
  opacity: 0.6;
}

/* ---- 首屏 ---- */
.page-news .news-hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 280px;
  margin-bottom: 40px;
  border-bottom: var(--timeline-line-width) solid var(--news-accent);
  overflow: hidden;
}
.page-news .news-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-news .news-hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 30%;
  opacity: 0.25;
  filter: grayscale(60%);
}
.page-news .news-hero__content {
  position: relative;
  z-index: 1;
  padding: 20px 0 16px;
}
.page-news .news-hero__title {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: var(--color-red);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.page-news .news-hero__title::before {
  content: attr(data-section) " · ";
  font-variant-numeric: tabular-nums;
  color: var(--color-gold);
}
.page-news .news-hero__desc {
  max-width: 600px;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  margin-bottom: 16px;
}
/* 筛选按钮 */
.page-news .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.page-news .filter-bar__btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  background: transparent;
  border: 1px solid var(--color-silver);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.page-news .filter-bar__btn:hover,
.page-news .filter-bar__btn:focus-visible {
  border-color: var(--news-accent);
  color: var(--news-accent);
}
.page-news .filter-bar__btn.is-active {
  background: var(--news-accent);
  border-color: var(--news-accent);
  color: #fff;
}

/* ---- 章节标题与标记 ---- */
.page-news .page-section {
  margin-bottom: 48px;
}
.page-news .section-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
}
.page-news .chapter-marker {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-red);
  line-height: 1;
}
.page-news .section-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  color: var(--color-blue);
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

/* ---- 时间线 ---- */
.page-news .timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding-left: calc(var(--timeline-dot-size) + 24px);
}
/* 垂直时间轴线 */
.page-news .timeline::before {
  content: "";
  position: absolute;
  left: calc(var(--timeline-dot-size) / 2);
  top: 4px;
  bottom: 4px;
  width: var(--timeline-line-width);
  background: linear-gradient(to bottom, var(--news-accent), var(--color-gold));
  opacity: 0.3;
  border-radius: 2px;
}
.page-news .timeline__node {
  position: relative;
  list-style: none;
}
/* 时间线圆点 */
.page-news .timeline__dot {
  position: absolute;
  left: calc(-1 * (var(--timeline-dot-size) + 24px) + 4px);
  top: 20px;
  width: var(--timeline-dot-size);
  height: var(--timeline-dot-size);
  border-radius: 50%;
  background: var(--news-accent);
  border: 2px solid var(--color-light);
  box-shadow: 0 0 0 3px var(--color-red);
  z-index: 1;
}
.page-news .timeline__content {
  width: 100%;
}
/* 卡片通用 */
.page-news .card {
  background: var(--news-bg-card);
  border: 1px solid var(--color-silver);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}
.page-news .card:hover {
  box-shadow: var(--shadow-float);
  transform: translateY(-2px);
}
.page-news .card__header {
  background: var(--color-blue);
  color: #fff;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.page-news .card__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  letter-spacing: 0.01em;
}
.page-news .tag {
  display: inline-block;
  background: var(--color-gold);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}
.page-news .card__body {
  padding: 16px;
}
.page-news .card__figure {
  margin: 0 0 12px;
}
.page-news .card__img {
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-sm);
  object-fit: cover;
  aspect-ratio: 2 / 1;
  display: block;
}
.page-news .card__text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text);
  margin: 0 0 12px;
}
/* 按钮继承 */
.page-news .btn-primary,
.page-news .btn-secondary {
  display: inline-block;
  padding: 8px 20px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
  cursor: pointer;
}
.page-news .btn-primary {
  background: var(--color-red);
  color: #fff;
  border: 1px solid var(--color-red);
}
.page-news .btn-primary:hover,
.page-news .btn-primary:focus-visible {
  background: #c72e3a;
}
.page-news .btn-secondary {
  background: transparent;
  color: var(--color-blue);
  border: 1px solid var(--color-blue);
}
.page-news .btn-secondary:hover,
.page-news .btn-secondary:focus-visible {
  background: var(--color-blue);
  color: #fff;
}

/* ---- 版本亮点网格 ---- */
.page-news .highlights-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.page-news .highlight-item {
  border-left: 4px solid var(--color-gold);
}
.page-news .card__header--icon {
  background: transparent;
  padding: 12px 16px 4px;
}
.page-news .highlight-icon {
  font-size: 2rem;
  color: var(--color-red);
  line-height: 1;
}
.page-news .card__subtitle {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--color-blue);
}
.page-news .mono-num {
  font-family: var(--font-mono);
  color: var(--color-green);
  font-weight: 600;
}

/* ---- 功能预告 ---- */
.page-news .preview-content {
  background: linear-gradient(135deg, #f0f2f5, #fff);
  border-left: 4px solid var(--color-green);
}
.page-news .card__body--wide {
  padding: 20px 24px;
}
.page-news .preview-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.page-news .preview-list__item {
  position: relative;
  padding-left: 20px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-text);
}
.page-news .preview-list__item::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-gold);
  font-weight: 700;
}

/* ---- 信任声明 ---- */
.page-news .trust-note {
  margin-top: 48px;
  padding: 16px;
  background: var(--color-dark);
  color: var(--color-silver);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.5;
  text-align: center;
}

/* ---- 桌面媒体查询 ---- */
@media (min-width: 768px) {
  .page-news .timeline {
    padding-left: calc(var(--timeline-dot-size) + 48px);
  }
  .page-news .timeline__dot {
    left: calc(-1 * (var(--timeline-dot-size) + 48px) + 4px);
  }
  .page-news .highlights-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-news .news-hero {
    min-height: 340px;
  }
  .page-news .card__body {
    display: flex;
    flex-direction: column;
  }
  .page-news .timeline__node .card__body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .page-news .timeline__node .card__figure {
    margin: 0;
  }
  .page-news .timeline__node .card__text {
    margin-bottom: 0;
  }
  .page-news .timeline__node .btn-primary,
  .page-news .timeline__node .btn-secondary {
    align-self: flex-start;
    margin-top: 12px;
  }
}

/* ---- 窄屏安全 ---- */
@media (max-width: 480px) {
  .page-news .news-hero__title {
    font-size: 1.5rem;
  }
  .page-news .filter-bar__btn {
    font-size: 0.75rem;
    padding: 4px 12px;
  }
  .page-news .timeline {
    padding-left: 20px;
  }
  .page-news .timeline__dot {
    left: -4px;
    width: 14px;
    height: 14px;
  }
  .page-news .card__header {
    flex-direction: column;
    align-items: flex-start;
  }
}
</main>