.page-news {
  --color-bg: #0A0E27;
  --color-elevated: #12183A;
  --color-accent: #FF6B35;
  --color-accent-dark: #D84315;
  --color-text: #F5F7FA;
  --color-muted: #8C9EAB;
  --color-glow: #00BCD4;
  --color-border-start: #B0BEC5;
  --color-border-end: #ECEFF1;
  --font-heading: 'Georgia', 'Times New Roman', serif;
  --font-body: 'Arial', 'Helvetica', sans-serif;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --transition: 0.3s ease;
  --max-width: 1200px;

  display: block;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-2xl);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  background: transparent;
}

/* 面包屑 */
.page-news .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(176,190,197,0.2);
}

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

.page-news .breadcrumb a:hover,
.page-news .breadcrumb a:focus {
  color: var(--color-accent);
  outline: none;
}

.page-news .breadcrumb-sep {
  color: var(--color-muted);
  opacity: 0.5;
}

.page-news .breadcrumb [aria-current="page"] {
  color: var(--color-text);
  font-weight: 600;
}

/* Hero 区 */
.page-news .news-hero {
  position: relative;
  margin-bottom: var(--space-2xl);
  overflow: hidden;
  background: var(--color-elevated);
  border: 1px solid rgba(176,190,197,0.15);
}

.page-news .news-hero-bg {
  position: relative;
  width: 100%;
  height: auto;
  line-height: 0;
}

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

.page-news .news-hero-overlay {
  padding: var(--space-lg) var(--space-md);
  background: linear-gradient(180deg, rgba(10,14,39,0.7) 0%, var(--color-bg) 100%);
}

.page-news .news-hero-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-style: italic;
  letter-spacing: 0.06em;
  font-size: 2.25rem;
  margin: 0 0 var(--space-sm);
  color: var(--color-text);
}

.page-news .news-hero-sub {
  font-size: 1rem;
  color: var(--color-muted);
  margin: 0;
  letter-spacing: 0.02em;
}

.page-news .news-hero-deco {
  width: 60px;
  height: 3px;
  margin-top: var(--space-md);
  background: linear-gradient(135deg, var(--color-border-start), var(--color-border-end));
}

/* 通用标题 */
.page-news .section-heading {
  font-family: var(--font-heading);
  font-weight: 700;
  font-style: italic;
  letter-spacing: 0.04em;
  font-size: 1.75rem;
  margin: 0 0 var(--space-md);
  color: var(--color-text);
}

.page-news .deco-line {
  height: 1px;
  background: linear-gradient(135deg, var(--color-border-start), var(--color-border-end));
  margin-bottom: var(--space-lg);
  opacity: 0.4;
}

/* 内容行 — 两列布局容器 */
.page-news .news-content-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

/* 最新动态 — 时间线 */
.page-news .news-timeline {
  flex: 1;
  min-width: 0;
}

.page-news .timeline-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-news .timeline-item {
  border-left: 1px solid rgba(176,190,197,0.25);
  padding-left: var(--space-lg);
  margin-left: var(--space-sm);
  position: relative;
  transition: border-color var(--transition);
}

.page-news .timeline-item[open] {
  border-left-color: var(--color-accent);
}

.page-news .timeline-summary {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  padding: var(--space-md) 0;
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color var(--transition);
}

.page-news .timeline-summary::-webkit-details-marker {
  display: none;
}

.page-news .timeline-summary:hover,
.page-news .timeline-summary:focus {
  color: var(--color-accent);
  outline: none;
}

.page-news .timeline-marker {
  position: absolute;
  left: -6px;
  top: 1.25rem;
  width: 10px;
  height: 10px;
  border-radius: 0;
  background: var(--color-elevated);
  border: 2px solid var(--color-border-start);
  transition: background var(--transition), border-color var(--transition);
}

.page-news .timeline-item[open] .timeline-marker {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.page-news .timeline-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  font-weight: 600;
  flex-shrink: 0;
}

.page-news .timeline-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  flex: 1;
}

.page-news .timeline-icon {
  font-size: 1.2rem;
  color: var(--color-muted);
  transition: transform var(--transition);
  flex-shrink: 0;
}

.page-news .timeline-item[open] .timeline-icon {
  transform: rotate(45deg);
  color: var(--color-accent);
}

.page-news .timeline-detail {
  padding: 0 0 var(--space-lg);
  animation: fadeSlideIn 0.3s ease;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-news .timeline-detail p {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin: 0 0 var(--space-md);
  line-height: 1.7;
}

.page-news .timeline-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border: 1px solid rgba(176,190,197,0.15);
  display: block;
  margin-top: var(--space-md);
}

/* 版本更新索引 */
.page-news .news-updates {
  flex: 1;
  min-width: 0;
}

.page-news .updates-categories {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.page-news .updates-category {
  background: rgba(18,24,58,0.5);
  border: 1px solid rgba(176,190,197,0.12);
  padding: var(--space-md);
}

.page-news .updates-cat-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.03em;
  color: var(--color-accent);
  margin: 0 0 var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(176,190,197,0.15);
}

.page-news .updates-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.page-news .updates-item {
  margin: 0;
}

.page-news .updates-detail {
  background: rgba(10,14,39,0.4);
  transition: background var(--transition);
}

.page-news .updates-detail[open] {
  background: rgba(10,14,39,0.7);
}

.page-news .updates-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition), background var(--transition);
  user-select: none;
}

.page-news .updates-summary::-webkit-details-marker {
  display: none;
}

.page-news .updates-summary:hover,
.page-news .updates-summary:focus {
  color: var(--color-accent);
  background: rgba(255,107,53,0.06);
  outline: none;
}

.page-news .updates-icon {
  font-size: 1.1rem;
  color: var(--color-muted);
  transition: transform var(--transition), color var(--transition);
}

.page-news .updates-detail[open] .updates-icon {
  transform: rotate(45deg);
  color: var(--color-accent);
}

.page-news .updates-desc {
  margin: 0;
  padding: 0 var(--space-md) var(--space-md);
  font-size: 0.9rem;
  color: var(--color-muted);
  line-height: 1.6;
  animation: fadeSlideIn 0.25s ease;
}

.page-news .updates-footer {
  margin-top: var(--space-lg);
  font-size: 0.9rem;
  color: var(--color-muted);
}

.page-news .updates-footer a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

.page-news .updates-footer a:hover,
.page-news .updates-footer a:focus {
  border-bottom-color: var(--color-accent);
  color: var(--color-glow);
}

/* 产品使用指南 — 标签页 */
.page-news .news-guide {
  margin-bottom: var(--space-2xl);
}

.page-news .tabs {
  position: relative;
  display: flex;
  flex-direction: column;
}

.page-news .tab-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.page-news .tab-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid rgba(176,190,197,0.2);
  margin-bottom: var(--space-lg);
}

.page-news .tab-label {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  user-select: none;
  margin-bottom: -1px;
}

.page-news .tab-label:hover,
.page-news .tab-label:focus {
  color: var(--color-text);
  background: rgba(255,255,255,0.03);
}

.page-news #tab-sync:checked ~ .tab-labels label[for="tab-sync"],
.page-news #tab-register:checked ~ .tab-labels label[for="tab-register"],
.page-news #tab-ui:checked ~ .tab-labels label[for="tab-ui"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.page-news .tab-panels {
  position: relative;
}

.page-news .tab-panel {
  display: none;
  animation: fadeSlideIn 0.35s ease;
}

.page-news #tab-sync:checked ~ .tab-panels .tab-panel[data-tab="tab-sync"],
.page-news #tab-register:checked ~ .tab-panels .tab-panel[data-tab="tab-register"],
.page-news #tab-ui:checked ~ .tab-panels .tab-panel[data-tab="tab-ui"] {
  display: block;
}

.page-news .tab-content-inner {
  padding: var(--space-md) 0;
  max-width: 720px;
}

.page-news .tab-content-inner p {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin: 0 0 var(--space-md);
  line-height: 1.7;
}

.page-news .tab-img {
  width: 100%;
  max-width: 500px;
  height: auto;
  border: 1px solid rgba(176,190,197,0.12);
  margin: var(--space-md) 0;
  display: block;
}

.page-news .tab-steps {
  list-style: none;
  counter-reset: step-counter;
  padding: 0;
  margin: 0 0 var(--space-md);
}

.page-news .tab-steps li {
  counter-increment: step-counter;
  padding: var(--space-sm) 0 var(--space-sm) var(--space-xl);
  position: relative;
  font-size: 0.95rem;
  color: var(--color-text);
  border-bottom: 1px solid rgba(176,190,197,0.08);
}

.page-news .tab-steps li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: var(--space-sm);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-bg);
  background: var(--color-accent);
}

.page-news .tab-steps li strong {
  color: var(--color-text);
  font-weight: 600;
}

.page-news .tab-cta {
  font-size: 0.9rem;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(176,190,197,0.1);
}

.page-news .tab-cta a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

.page-news .tab-cta a:hover,
.page-news .tab-cta a:focus {
  border-bottom-color: var(--color-accent);
  color: var(--color-glow);
}

/* 行业观察 */
.page-news .news-insights {
  margin-bottom: var(--space-xl);
}

.page-news .insights-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.page-news .insights-text {
  flex: 1;
}

.page-news .insights-text p {
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0 0 var(--space-md);
}

.page-news .insights-text p:last-child {
  margin-bottom: 0;
}

.page-news .insights-visual {
  flex-shrink: 0;
  line-height: 0;
}

.page-news .insights-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 1px solid rgba(176,190,197,0.12);
  display: block;
}

.page-news .insights-footer {
  margin-top: var(--space-lg);
  font-size: 0.9rem;
  color: var(--color-muted);
  padding-top: var(--space-md);
  border-top: 1px solid rgba(176,190,197,0.1);
}

.page-news .insights-footer a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

.page-news .insights-footer a:hover,
.page-news .insights-footer a:focus {
  border-bottom-color: var(--color-accent);
  color: var(--color-glow);
}

/* ===== 响应式：桌面端 (≥768px) ===== */
@media (min-width: 768px) {
  .page-news {
    padding: var(--space-xl) var(--space-lg) var(--space-2xl);
  }

  .page-news .breadcrumb {
    font-size: 0.9rem;
    margin-bottom: var(--space-xl);
  }

  .page-news .news-hero-overlay {
    padding: var(--space-xl) var(--space-lg);
  }

  .page-news .news-hero-title {
    font-size: 3rem;
  }

  .page-news .news-hero-sub {
    font-size: 1.1rem;
  }

  .page-news .section-heading {
    font-size: 2rem;
  }

  /* 两列布局 */
  .page-news .news-content-row {
    flex-direction: row;
    gap: var(--space-2xl);
  }

  .page-news .news-timeline {
    flex: 1.2;
  }

  .page-news .news-updates {
    flex: 1;
  }

  /* 时间线 */
  .page-news .timeline-title {
    font-size: 1.1rem;
  }

  .page-news .timeline-detail p {
    font-size: 1rem;
  }

  /* 版本更新分类 */
  .page-news .updates-category {
    padding: var(--space-lg);
  }

  .page-news .updates-cat-title {
    font-size: 1.25rem;
  }

  .page-news .updates-summary {
    font-size: 1rem;
    padding: var(--space-sm) var(--space-md);
  }

  /* 标签页 */
  .page-news .tab-label {
    font-size: 1rem;
    padding: var(--space-md) var(--space-lg);
  }

  .page-news .tab-content-inner {
    padding: var(--space-lg) 0;
  }

  .page-news .tab-content-inner p {
    font-size: 1rem;
  }

  .page-news .tab-steps li {
    font-size: 1rem;
    padding-left: var(--space-2xl);
  }

  .page-news .tab-steps li::before {
    width: 32px;
    height: 32px;
    font-size: 0.95rem;
  }

  /* 行业观察并排 */
  .page-news .insights-content {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-2xl);
  }

  .page-news .insights-text {
    flex: 1;
  }

  .page-news .insights-text p {
    font-size: 1rem;
  }

  .page-news .insights-visual {
    flex: 0 0 auto;
  }

  .page-news .insights-img {
    max-width: 400px;
  }
}

/* ===== 大桌面端 (≥1024px) ===== */
@media (min-width: 1024px) {
  .page-news {
    padding: var(--space-2xl) var(--space-2xl) var(--space-2xl);
  }

  .page-news .news-hero-title {
    font-size: 3.5rem;
  }

  .page-news .section-heading {
    font-size: 2.25rem;
  }

  .page-news .news-content-row {
    gap: var(--space-2xl);
  }

  .page-news .timeline-summary {
    padding: var(--space-md) 0;
  }

  .page-news .updates-categories {
    gap: var(--space-lg);
  }
}