/* ============================================================
   page-news —— 更新说明页面专属样式
   作用域限定：所有选择器以 .page-news 为前缀
   ============================================================ */

/* ---------- 设计令牌（页面级变量） ---------- */
.page-news {
  --news-accent-line: var(--color-accent-blue, #00D4FF);
  --news-accent-dot: var(--color-accent-orange, #FF6B35);
  --news-card-glow: rgba(0, 212, 255, 0.08);
  --timeline-width: 3px;
  --timeline-dot-size: 16px;
  --card-radius: 12px;
  --card-padding: 1.25rem;

  /* 字体层级 */
  --news-h2-size: clamp(1.5rem, 3.5vw, 2.25rem);
  --news-h3-size: clamp(1.125rem, 1.8vw, 1.35rem);
  --news-body-size: var(--body-size, 1rem);
  --news-small-size: var(--small-size, 0.875rem);

  color: var(--color-text-primary, #FFFFFF);
  background-color: var(--color-primary-bg, #0B1D3A);
}

/* ---------- 面包屑 ---------- */
.page-news .breadcrumb {
  padding: 1rem var(--side-menu-width, 220px) 0 1rem;
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  font-size: var(--news-small-size);
}
.page-news .breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
}
.page-news .breadcrumb li {
  display: inline;
  color: var(--color-text-secondary, #B0B0B8);
}
.page-news .breadcrumb li + li::before {
  content: "·";
  margin-right: 0.5rem;
  color: var(--color-text-secondary, #B0B0B8);
}
.page-news .breadcrumb a {
  color: var(--color-accent-blue, #00D4FF);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s);
}
.page-news .breadcrumb a:hover,
.page-news .breadcrumb a:focus-visible {
  color: var(--color-accent-orange, #FF6B35);
  text-decoration: underline;
}
.page-news .breadcrumb li[aria-current="page"] {
  color: var(--color-text-primary, #FFFFFF);
  font-weight: 500;
}

/* ---------- 页面标题区 ---------- */
.page-news .page-title-area {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: var(--max-width, 1280px);
  margin: 1rem auto 0.5rem;
  padding: 0 1rem 0 calc(var(--side-menu-width, 220px) + 1rem);
}
.page-news .title-text-group {
  flex: 1;
  min-width: 0;
}
.page-news .page-heading {
  font-family: var(--font-heading, 'Arial Black', sans-serif);
  font-size: var(--h1-size, clamp(2.25rem, 5vw, 3rem));
  margin: 0 0 0.25rem;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--color-text-primary, #FFFFFF);
}
.page-news .page-subtitle {
  font-family: var(--font-body, system-ui, sans-serif);
  font-size: calc(var(--news-body-size) + 0.125rem);
  color: var(--color-accent-blue, #00D4FF);
  margin: 0;
  letter-spacing: 0.04em;
}
.page-news .title-icon {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  object-fit: contain;
  border-radius: 50%;
  background: var(--color-secondary-bg, #1A2D4A);
  padding: 0.5rem;
  box-shadow: 0 0 0 2px var(--glass-border, rgba(0,212,255,0.15));
  transition: transform var(--transition-base, 0.3s);
}
.page-news .title-icon:hover {
  transform: scale(1.04);
}

/* ---------- 快速导航标签 ---------- */
.page-news .section-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: var(--max-width, 1280px);
  margin: 0.75rem auto 0;
  padding: 0 1rem 0 calc(var(--side-menu-width, 220px) + 1rem);
  border-bottom: 1px solid var(--color-border, #2A3F5A);
  padding-bottom: 0.75rem;
}
.page-news .tab-link {
  font-family: var(--font-body, system-ui, sans-serif);
  font-size: var(--news-small-size);
  font-weight: 600;
  color: var(--color-text-secondary, #B0B0B8);
  text-decoration: none;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: all var(--transition-fast, 0.2s);
  background: transparent;
}
.page-news .tab-link:hover,
.page-news .tab-link:focus-visible {
  color: var(--color-accent-blue, #00D4FF);
  border-color: var(--color-accent-blue, #00D4FF);
  background: rgba(0, 212, 255, 0.06);
}
.page-news .tab-link[aria-selected="true"],
.page-news .tab-link:target {
  color: var(--color-accent-orange, #FF6B35);
  border-color: var(--color-accent-orange, #FF6B35);
  background: rgba(255, 107, 53, 0.08);
}

/* ---------- 通用区块标题 ---------- */
.page-news .section-title {
  font-family: var(--font-heading, 'Arial Black', sans-serif);
  font-size: var(--news-h2-size);
  margin: 0 0 0.25rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.page-news .section-desc {
  font-size: var(--news-body-size);
  color: var(--color-text-secondary, #B0B0B8);
  margin: 0 0 1.5rem;
  max-width: 640px;
}

/* ---------- 区块1：最新版本 ---------- */
.page-news .section-latest {
  max-width: var(--max-width, 1280px);
  margin: 2rem auto 0;
  padding: 0 1rem 0 calc(var(--side-menu-width, 220px) + 1rem);
}
.page-news .latest-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.page-news .version-badge {
  display: inline-block;
  background: var(--color-accent-orange, #FF6B35);
  color: var(--color-primary-bg, #0B1D3A);
  font-family: var(--font-digit, 'Courier New', monospace);
  font-size: calc(var(--news-h2-size) * 0.55);
  font-weight: 700;
  padding: 0.15em 0.6em;
  border-radius: 6px;
  line-height: 1.3;
  vertical-align: middle;
  margin-left: 0.4em;
}
.page-news .latest-banner {
  width: 100%;
  max-width: 800px;
  height: auto;
  max-height: 200px;
  object-fit: cover;
  border-radius: var(--card-radius, 12px);
  opacity: 0.7;
  border: 1px solid var(--glass-border, rgba(0,212,255,0.12));
  background: var(--color-secondary-bg, #1A2D4A);
}

/* 最新版本 —— 布局：时间线 + 截图 */
.page-news .latest-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: flex-start;
}
.page-news .timeline {
  flex: 1;
  min-width: 280px;
  position: relative;
  padding-left: 2rem;
}

/* ---------- 时间线 ---------- */
.page-news .timeline-item {
  position: relative;
  padding-bottom: 2rem;
}
.page-news .timeline-item:last-child {
  padding-bottom: 0;
}
.page-news .timeline-marker {
  position: absolute;
  left: -2rem;
  top: 0.35rem;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: var(--timeline-dot-size);
}
.page-news .timeline-dot {
  width: var(--timeline-dot-size);
  height: var(--timeline-dot-size);
  border-radius: 50%;
  background: var(--news-accent-dot, #FF6B35);
  border: 3px solid var(--color-primary-bg, #0B1D3A);
  box-shadow: 0 0 0 2px var(--news-accent-dot, #FF6B35);
  flex-shrink: 0;
  z-index: 1;
  transition: transform var(--transition-fast, 0.2s);
}
.page-news .timeline-item:hover .timeline-dot {
  transform: scale(1.15);
}
.page-news .timeline-rail {
  flex: 1;
  width: var(--timeline-width);
  background: linear-gradient(to bottom, var(--news-accent-line, #00D4FF), var(--color-border, #2A3F5A));
  border-radius: 4px;
  margin-top: 2px;
}
.page-news .timeline-item:last-child .timeline-rail {
  display: none;
}

/* 时间线卡片 */
.page-news .timeline-card {
  background: var(--glass-bg, rgba(11, 29, 58, 0.85));
  border: 1px solid var(--glass-border, rgba(0,212,255,0.12));
  border-radius: var(--card-radius, 12px);
  padding: var(--card-padding);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: border-color var(--transition-base, 0.3s), box-shadow var(--transition-base, 0.3s);
  position: relative;
}
.page-news .timeline-card:hover {
  border-color: var(--news-accent-line, #00D4FF);
  box-shadow: 0 0 20px var(--news-card-glow);
}
.page-news .card-step {
  display: inline-block;
  font-family: var(--font-digit, 'Courier New', monospace);
  font-size: var(--news-small-size);
  color: var(--news-accent-line, #00D4FF);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 0.3rem;
}
.page-news .card-title {
  font-family: var(--font-heading, 'Arial Black', sans-serif);
  font-size: var(--news-h3-size);
  margin: 0 0 0.3rem;
  line-height: 1.2;
}
.page-news .card-summary {
  margin: 0 0 0.6rem;
  font-size: var(--news-body-size);
  color: var(--color-text-secondary, #B0B0B8);
  line-height: 1.5;
}
.page-news .card-details {
  font-size: var(--news-small-size);
  color: var(--color-text-secondary, #B0B0B8);
  border-top: 1px solid var(--color-border, #2A3F5A);
  padding-top: 0.5rem;
  margin-top: 0.5rem;
}
.page-news .card-details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--color-accent-blue, #00D4FF);
  transition: color var(--transition-fast, 0.2s);
  padding: 0.2rem 0;
  list-style: none;
}
.page-news .card-details summary::-webkit-details-marker {
  display: none;
}
.page-news .card-details summary::before {
  content: "▶ ";
  display: inline-block;
  transition: transform var(--transition-fast, 0.2s);
  font-size: 0.7em;
  margin-right: 0.3em;
}
.page-news .card-details[open] summary::before {
  transform: rotate(90deg);
}
.page-news .card-details summary:hover,
.page-news .card-details summary:focus-visible {
  color: var(--color-accent-orange, #FF6B35);
}
.page-news .details-body {
  padding-top: 0.5rem;
  line-height: 1.6;
}
.page-news .details-body p {
  margin: 0 0 0.5rem;
}
.page-news .details-body p:last-child {
  margin-bottom: 0;
}

/* 截图配图 */
.page-news .latest-screenshot {
  flex-shrink: 0;
  width: 220px;
  align-self: center;
}
.page-news .screenshot-img {
  width: 100%;
  height: auto;
  max-height: 600px;
  object-fit: contain;
  border-radius: 16px;
  border: 2px solid var(--glass-border, rgba(0,212,255,0.15));
  background: var(--color-secondary-bg, #1A2D4A);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  transition: transform var(--transition-base, 0.3s), border-color var(--transition-base, 0.3s);
}
.page-news .screenshot-img:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-orange, #FF6B35);
}

/* ---------- 区块2：历史版本 ---------- */
.page-news .section-history {
  max-width: var(--max-width, 1280px);
  margin: 3.5rem auto 0;
  padding: 0 1rem 0 calc(var(--side-menu-width, 220px) + 1rem);
}
.page-news .history-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 2px solid var(--color-border, #2A3F5A);
  margin-left: 0.5rem;
  padding-left: 1.5rem;
}
.page-news .history-item {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border, #2A3F5A);
  position: relative;
  transition: background var(--transition-fast, 0.2s);
  border-radius: 4px;
}
.page-news .history-item:last-child {
  border-bottom: none;
}
.page-news .history-item:hover {
  background: rgba(0, 212, 255, 0.03);
}
.page-news .history-marker {
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent-blue, #00D4FF);
  margin-top: 0.35rem;
  position: relative;
  left: -0.3rem;
  box-shadow: 0 0 0 3px var(--color-primary-bg, #0B1D3A);
}
.page-news .history-content {
  flex: 1;
  min-width: 0;
}
.page-news .history-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent-orange, #FF6B35);
  background: rgba(255, 107, 53, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.25rem;
}
.page-news .history-title {
  font-family: var(--font-heading, 'Arial Black', sans-serif);
  font-size: calc(var(--news-h3-size) * 0.95);
  margin: 0 0 0.2rem;
  line-height: 1.2;
}
.page-news .history-summary {
  margin: 0;
  font-size: var(--news-body-size);
  color: var(--color-text-secondary, #B0B0B8);
  line-height: 1.5;
}

/* ---------- 区块3：行业观察 ---------- */
.page-news .section-insights {
  max-width: var(--max-width, 1280px);
  margin: 3.5rem auto 2.5rem;
  padding: 0 1rem 0 calc(var(--side-menu-width, 220px) + 1rem);
}
.page-news .insights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.page-news .insight-card {
  background: var(--color-card-bg, #14283F);
  border: 1px solid var(--color-border, #2A3F5A);
  border-radius: var(--card-radius, 12px);
  overflow: hidden;
  transition: border-color var(--transition-base, 0.3s), transform var(--transition-base, 0.3s), box-shadow var(--transition-base, 0.3s);
  display: flex;
  flex-direction: column;
  padding-bottom: 1rem;
}
.page-news .insight-card:hover {
  border-color: var(--news-accent-line, #00D4FF);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px var(--news-card-glow);
}
.page-news .insight-img-wrap {
  width: 100%;
  height: 160px;
  overflow: hidden;
  background: var(--color-secondary-bg, #1A2D4A);
}
.page-news .insight-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base, 0.3s);
}
.page-news .insight-card:hover .insight-img {
  transform: scale(1.03);
}
.page-news .insight-tag {
  display: inline-block;
  align-self: flex-start;
  margin: 0.75rem 1rem 0.25rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent-blue, #00D4FF);
  background: rgba(0, 212, 255, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}
.page-news .insight-title {
  font-family: var(--font-heading, 'Arial Black', sans-serif);
  font-size: calc(var(--news-h3-size) * 0.9);
  margin: 0.25rem 1rem 0.35rem;
  line-height: 1.2;
}
.page-news .insight-note {
  font-size: var(--news-small-size);
  color: var(--color-text-secondary, #B0B0B8);
  margin: 0 1rem;
  line-height: 1.5;
}
.page-news .insights-footer-note {
  font-size: var(--news-small-size);
  color: var(--color-text-secondary, #B0B0B8);
  border-top: 1px solid var(--color-border, #2A3F5A);
  padding-top: 1rem;
  margin-top: 0.5rem;
}
.page-news .insights-footer-note a {
  color: var(--color-accent-blue, #00D4FF);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast, 0.2s);
}
.page-news .insights-footer-note a:hover,
.page-news .insights-footer-note a:focus-visible {
  color: var(--color-accent-orange, #FF6B35);
  text-decoration: underline;
}

/* ---------- 返回顶部按钮 ---------- */
.page-news .back-top-btn {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 999;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--color-accent-blue, #00D4FF);
  background: var(--glass-bg, rgba(11, 29, 58, 0.9));
  color: var(--color-accent-blue, #00D4FF);
  font-size: 1.25rem;
  cursor: pointer;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: opacity var(--transition-fast, 0.2s), transform var(--transition-fast, 0.2s), border-color var(--transition-fast, 0.2s);
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}
.page-news .back-top-btn:not([hidden]) {
  display: flex;
}
.page-news .back-top-btn:hover,
.page-news .back-top-btn:focus-visible {
  border-color: var(--color-accent-orange, #FF6B35);
  color: var(--color-accent-orange, #FF6B35);
  transform: scale(1.05);
}

/* ============================================================
   响应式：移动端优先 —— 窄屏适配
   ============================================================ */

/* 最大宽度 767px —— 手机 */
@media (max-width: 767px) {
  .page-news .breadcrumb {
    padding: 0.75rem 1rem 0;
  }
  .page-news .page-title-area {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.75rem 1rem 0;
    margin-top: 0.5rem;
  }
  .page-news .title-icon {
    width: 72px;
    height: 72px;
  }
  .page-news .section-tabs {
    padding: 0 1rem 0.5rem;
    gap: 0.3rem;
  }
  .page-news .tab-link {
    padding: 0.3rem 0.75rem;
    font-size: 0.75rem;
  }
  .page-news .section-latest,
  .page-news .section-history,
  .page-news .section-insights {
    padding: 0 1rem;
    margin-top: 1.5rem;
  }
  .page-news .latest-layout {
    flex-direction: column;
  }
  .page-news .timeline {
    padding-left: 1.5rem;
  }
  .page-news .timeline-marker {
    left: -1.5rem;
  }
  .page-news .timeline-dot {
    width: 12px;
    height: 12px;
  }
  .page-news .latest-screenshot {
    width: 160px;
    align-self: center;
  }
  .page-news .insights-grid {
    grid-template-columns: 1fr;
  }
  .page-news .history-list {
    padding-left: 1rem;
    margin-left: 0.25rem;
  }
  .page-news .history-marker {
    width: 8px;
    height: 8px;
    left: -0.15rem;
  }
  .page-news .insight-img-wrap {
    height: 140px;
  }
  .page-news .back-top-btn {
    bottom: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
  }
}

/* 768px ~ 1023px —— 平板 */
@media (min-width: 768px) and (max-width: 1023px) {
  .page-news .page-title-area {
    padding: 0.75rem 1.5rem 0 calc(var(--side-menu-width, 220px) + 1rem);
  }
  .page-news .section-latest,
  .page-news .section-history,
  .page-news .section-insights {
    padding: 0 1.5rem 0 calc(var(--side-menu-width, 220px) + 1rem);
  }
  .page-news .section-tabs {
    padding: 0 1.5rem 0.75rem calc(var(--side-menu-width, 220px) + 1rem);
  }
  .page-news .latest-screenshot {
    width: 180px;
  }
  .page-news .insights-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 1024px 及以上 —— 桌面 */
@media (min-width: 1024px) {
  .page-news .latest-layout {
    flex-wrap: nowrap;
  }
  .page-news .latest-screenshot {
    width: 220px;
  }
  .page-news .insights-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* 为防止侧边栏折叠时布局错乱，提供降级 */
@media (max-width: 1199px) {
  .page-news .breadcrumb,
  .page-news .page-title-area,
  .page-news .section-tabs,
  .page-news .section-latest,
  .page-news .section-history,
  .page-news .section-insights {
    padding-left: 1rem;
  }
  .page-news .page-title-area {
    padding-left: 1rem;
  }
  .page-news .section-tabs {
    padding-left: 1rem;
  }
}

/* ---------- 高对比度 & 焦点 ---------- */
.page-news a:focus-visible,
.page-news button:focus-visible,
.page-news summary:focus-visible {
  outline: 3px solid var(--color-accent-orange, #FF6B35);
  outline-offset: 3px;
}

/* ---------- 打印优化 ---------- */
@media print {
  .page-news {
    background: #fff;
    color: #111;
  }
  .page-news .back-top-btn,
  .page-news .section-tabs {
    display: none !important;
  }
  .page-news .timeline-card,
  .page-news .insight-card {
    break-inside: avoid;
    border: 1px solid #ccc;
    background: #f9f9f9;
  }
  .page-news .breadcrumb a {
    color: #111;
  }
}