/* ============================================
   page-news : 最新动态 · 回访用户内容专栏与品牌更新
   作用域限定：所有选择器以 .page-news 开头
   移动端优先 + 桌面媒体查询
   ============================================ */

/* --- 设计变量（作用域内） --- */
.page-news {
  --news-bg: #F5F5F5;
  --news-card-bg: #FFFFFF;
  --news-text-dark: #1A1A1A;
  --news-text-soft: #444444;
  --news-text-muted: #8899AA;
  --news-accent-gold: #FFD700;
  --news-accent-cyan: #00E5FF;
  --news-accent-blue: #0A192F;
  --news-divider: #E0E0E0;
  --news-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --news-radius: 6px;
  --news-timeline-width: 48px;
  --news-node-size: 40px;
}

/* --- 基础布局 --- */
.page-news {
  background: var(--news-bg);
  color: var(--news-text-dark);
  font-family: var(--font-body, 'Inter', sans-serif);
  line-height: var(--lh-body, 1.6);
  padding-bottom: var(--spacing-xl, 4rem);
}

.page-news .container {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 0 var(--spacing-md, 1rem);
}

.page-news .section {
  padding: var(--spacing-xl, 4rem) 0;
}

.page-news .section-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-heading, 700);
  font-size: var(--fs-heading-lg, clamp(2rem, 4vw, 3.5rem));
  letter-spacing: var(--ls-heading, -0.02em);
  color: var(--news-accent-blue);
  margin: 0 0 var(--spacing-sm, 0.5rem) 0;
  position: relative;
  display: inline-block;
}

.page-news .section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--news-accent-gold);
  margin-top: 0.4rem;
  border-radius: 2px;
}

.page-news .section-desc {
  font-size: var(--fs-body, 1rem);
  color: var(--news-text-soft);
  margin: 0 0 var(--spacing-lg, 2rem) 0;
  max-width: 700px;
}

/* --- 面包屑 --- */
.page-news .breadcrumb {
  padding: var(--spacing-md, 1rem) var(--spacing-md, 1rem) 0;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  font-size: var(--fs-caption, 0.75rem);
  color: var(--news-text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.page-news .breadcrumb-link {
  color: var(--news-accent-cyan);
  text-decoration: none;
  transition: opacity var(--transition-fast, 0.2s ease);
}

.page-news .breadcrumb-link:hover {
  opacity: 0.7;
}

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

.page-news .breadcrumb-current {
  color: var(--news-text-dark);
  font-weight: var(--fw-special, 500);
}

/* --- 首屏框景 --- */
.page-news .news-hero {
  position: relative;
  background: var(--news-accent-blue);
  color: #FFFFFF;
  padding: var(--spacing-xl, 4rem) var(--spacing-md, 1rem);
  margin: 0 var(--spacing-md, 1rem) var(--spacing-xl, 4rem);
  max-width: calc(var(--max-width, 1200px) - 2rem);
  margin-left: auto;
  margin-right: auto;
  border-radius: var(--news-radius);
  overflow: hidden;
}

.page-news .hero-inner {
  position: relative;
  z-index: 2;
}

.page-news .hero-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-heading, 700);
  font-size: var(--fs-heading-xl, clamp(2.75rem, 6vw, 6rem));
  letter-spacing: var(--ls-heading, -0.02em);
  margin: 0 0 0.5rem 0;
  line-height: 1.1;
}

.page-news .hero-subtitle {
  font-size: var(--fs-body, 1rem);
  color: rgba(255, 255, 255, 0.75);
  max-width: 650px;
  margin: 0;
  line-height: 1.5;
}

.page-news .hero-meta {
  display: flex;
  gap: 0.6rem;
  margin-top: var(--spacing-lg, 2rem);
  flex-wrap: wrap;
  position: relative;
  z-index: 2;
}

.page-news .meta-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: var(--fs-caption, 0.75rem);
  font-weight: var(--fw-special, 500);
  letter-spacing: var(--ls-special, 0.05em);
  border: 1px solid var(--news-accent-gold);
  color: var(--news-accent-gold);
  border-radius: 20px;
  text-transform: uppercase;
}

/* 框景刻度装饰 */
.page-news .frame-corner {
  position: absolute;
  width: 32px;
  height: 32px;
  border-color: var(--news-accent-cyan);
  border-style: solid;
  opacity: 0.5;
  pointer-events: none;
  z-index: 1;
}

.page-news .frame-corner--tl {
  top: 12px;
  left: 12px;
  border-width: 2px 0 0 2px;
}

.page-news .frame-corner--tr {
  top: 12px;
  right: 12px;
  border-width: 2px 2px 0 0;
}

.page-news .frame-corner--bl {
  bottom: 12px;
  left: 12px;
  border-width: 0 0 2px 2px;
}

.page-news .frame-corner--br {
  bottom: 12px;
  right: 12px;
  border-width: 0 2px 2px 0;
}

/* --- 时间轴区域 --- */
.page-news .section--timeline {
  background: var(--news-bg);
}

.page-news .timeline-header-img {
  margin-bottom: var(--spacing-lg, 2rem);
  border-radius: var(--news-radius);
  overflow: hidden;
  position: relative;
  z-index: 1;
}

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

/* 筛选控件 */
.page-news .filter-group {
  display: flex;
  gap: 0.5rem;
  margin-bottom: var(--spacing-lg, 2rem);
  flex-wrap: wrap;
}

.page-news .filter-radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.page-news .filter-label {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  font-size: var(--fs-special, 0.875rem);
  font-weight: var(--fw-special, 500);
  color: var(--news-text-soft);
  background: var(--news-card-bg);
  border: 1px solid var(--news-divider);
  border-radius: 30px;
  cursor: pointer;
  transition: background var(--transition-fast, 0.2s ease),
              color var(--transition-fast, 0.2s ease),
              border-color var(--transition-fast, 0.2s ease);
  user-select: none;
}

.page-news .filter-label:hover {
  border-color: var(--news-accent-gold);
  color: var(--news-accent-blue);
}

/* 被选中的radio对应的label */
.page-news #period-all:checked ~ .filter-label[for="period-all"],
.page-news #period-early:checked ~ .filter-label[for="period-early"],
.page-news #period-late:checked ~ .filter-label[for="period-late"] {
  background: var(--news-accent-blue);
  color: #FFFFFF;
  border-color: var(--news-accent-blue);
}

/* --- 时间轴主体 --- */
.page-news .timeline-rail {
  position: relative;
  padding-left: calc(var(--news-timeline-width) + 20px);
}

/* 时间轴竖线（贯穿所有节点） */
.page-news .timeline-rail::before {
  content: '';
  position: absolute;
  left: calc(var(--news-timeline-width) / 2 + 20px - 2px);
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--news-accent-cyan);
  border-radius: 2px;
  opacity: 0.4;
  z-index: 0;
}

/* 每个时间轴项 */
.page-news .timeline-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--spacing-xl, 4rem);
  position: relative;
  z-index: 1;
}

.page-news .timeline-item:last-child {
  margin-bottom: 0;
}

/* 节点包裹层（定位） */
.page-news .timeline-node-wrap {
  flex: 0 0 var(--news-timeline-width);
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
  padding-top: 4px;
  margin-left: -20px;
}

/* 时间轴节点 */
.page-news .timeline-node {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--news-node-size);
  height: var(--news-node-size);
  border-radius: 50%;
  background: var(--news-accent-blue);
  color: var(--news-accent-gold);
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-heading, 700);
  font-size: 1rem;
  text-decoration: none;
  border: 2px solid var(--news-accent-gold);
  box-shadow: 0 0 0 4px var(--news-bg), 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: transform var(--transition-fast, 0.2s ease),
              box-shadow var(--transition-fast, 0.2s ease);
  cursor: pointer;
  position: relative;
  z-index: 3;
}

.page-news .timeline-node:hover {
  transform: scale(1.12);
  box-shadow: 0 0 0 4px var(--news-bg), 0 0 20px rgba(0, 229, 255, 0.3);
}

.page-news .timeline-node:focus-visible {
  outline: 2px solid var(--news-accent-cyan);
  outline-offset: 4px;
}

/* 卡片（时间轴右侧） */
.page-news .timeline-card {
  flex: 1;
  min-width: 0;
  margin-left: var(--spacing-lg, 2rem);
  background: var(--news-card-bg);
  border-radius: var(--news-radius);
  box-shadow: var(--news-shadow);
  border: 1px solid var(--news-divider);
  overflow: hidden;
  transition: transform var(--transition-base, 0.35s ease),
              box-shadow var(--transition-base, 0.35s ease);
}

.page-news .timeline-card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.12);
  border-color: var(--news-accent-gold);
}

/* 卡片媒体 */
.page-news .card-media {
  overflow: hidden;
  background: #E8ECF0;
}

.page-news .card-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform var(--transition-base, 0.35s ease);
}

.page-news .timeline-card:hover .card-media img {
  transform: scale(1.03);
}

/* 卡片内容 */
.page-news .card-body {
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem) var(--spacing-lg, 2rem);
}

.page-news .card-badge {
  display: inline-block;
  font-size: var(--fs-caption, 0.75rem);
  font-weight: var(--fw-special, 500);
  letter-spacing: var(--ls-special, 0.05em);
  color: var(--news-accent-gold);
  background: rgba(255, 215, 0, 0.08);
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.page-news .card-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-heading, 700);
  font-size: var(--fs-heading-sm, clamp(1.125rem, 1.8vw, 1.5rem));
  color: var(--news-accent-blue);
  margin: 0 0 0.4rem 0;
  letter-spacing: var(--ls-heading, -0.02em);
}

.page-news .card-summary {
  font-size: var(--fs-body, 1rem);
  color: var(--news-text-soft);
  margin: 0 0 var(--spacing-sm, 0.5rem) 0;
  line-height: 1.5;
}

/* 详情区域：默认隐藏，通过 :target 显示 */
.page-news .card-detail {
  display: none;
  margin-top: var(--spacing-sm, 0.5rem);
  padding-top: var(--spacing-sm, 0.5rem);
  border-top: 1px dashed var(--news-divider);
  font-size: var(--fs-body, 1rem);
  color: var(--news-text-dark);
  line-height: 1.6;
}

.page-news .card-detail p {
  margin: 0;
}

/* 当卡片被 :target 时显示详情 */
.page-news .timeline-card:target .card-detail {
  display: block;
  animation: detailFadeIn 0.35s ease forwards;
}

@keyframes detailFadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 按钮 */
.page-news .btn {
  display: inline-block;
  font-family: var(--font-special, 'Inter', sans-serif);
  font-weight: var(--fw-special, 500);
  font-size: var(--fs-special, 0.875rem);
  letter-spacing: var(--ls-special, 0.05em);
  padding: 0.55rem 1.4rem;
  border-radius: 30px;
  text-decoration: none;
  transition: background var(--transition-fast, 0.2s ease),
              color var(--transition-fast, 0.2s ease),
              transform var(--transition-fast, 0.2s ease);
  cursor: pointer;
  border: 1px solid transparent;
  margin-top: var(--spacing-sm, 0.5rem);
}

.page-news .btn--outline {
  background: transparent;
  border-color: var(--news-accent-cyan);
  color: var(--news-accent-blue);
}

.page-news .btn--outline:hover {
  background: var(--news-accent-cyan);
  color: var(--news-accent-blue);
  transform: scale(1.04);
}

.page-news .btn--outline:active {
  transform: scale(0.96);
}

.page-news .btn--sm {
  padding: 0.35rem 1.1rem;
  font-size: var(--fs-caption, 0.75rem);
}

/* --- 筛选功能：通过 radio 控制卡片显示 --- */
/* 默认全部显示 */
.page-news .timeline-item {
  display: flex;
}

/* 筛选：早期（第12-15期） */
.page-news #period-early:checked ~ .timeline-rail .timeline-item[data-period="late"] {
  display: none;
}

/* 筛选：晚期（第16-18期） */
.page-news #period-late:checked ~ .timeline-rail .timeline-item[data-period="early"] {
  display: none;
}

/* 注意：由于 radio 和 .timeline-rail 是兄弟关系，上述选择器有效 */

/* --- 更新记录区域 --- */
.page-news .section--updates {
  background: var(--news-card-bg);
  border-top: 1px solid var(--news-divider);
  border-bottom: 1px solid var(--news-divider);
}

.page-news .updates-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md, 1rem);
  max-width: 800px;
}

.page-news .update-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md, 1rem);
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  background: var(--news-bg);
  border-radius: var(--news-radius);
  border-left: 3px solid var(--news-accent-cyan);
  transition: background var(--transition-fast, 0.2s ease),
              transform var(--transition-fast, 0.2s ease);
}

.page-news .update-item:hover {
  background: #ECF5FF;
  transform: translateX(4px);
}

.page-news .update-icon {
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  margin-top: 2px;
  background: var(--news-divider);
}

.page-news .update-content {
  flex: 1;
  min-width: 0;
}

.page-news .update-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-heading, 700);
  font-size: var(--fs-heading-sm, clamp(1.125rem, 1.8vw, 1.5rem));
  color: var(--news-accent-blue);
  margin: 0 0 0.2rem 0;
  letter-spacing: var(--ls-heading, -0.02em);
}

.page-news .update-desc {
  font-size: var(--fs-body, 1rem);
  color: var(--news-text-soft);
  margin: 0;
  line-height: 1.5;
}

.page-news .update-tag {
  flex: 0 0 auto;
  font-size: var(--fs-caption, 0.75rem);
  font-weight: var(--fw-special, 500);
  color: var(--news-accent-blue);
  background: rgba(10, 25, 47, 0.06);
  padding: 0.2rem 0.7rem;
  border-radius: 20px;
  white-space: nowrap;
  margin-left: var(--spacing-sm, 0.5rem);
}

.page-news .updates-footer {
  margin-top: var(--spacing-lg, 2rem);
}

/* --- 行业观察区域 --- */
.page-news .section--insights {
  background: var(--news-bg);
}

.page-news .insights-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg, 2rem);
  margin-bottom: var(--spacing-lg, 2rem);
}

.page-news .insight-card {
  background: var(--news-card-bg);
  border-radius: var(--news-radius);
  box-shadow: var(--news-shadow);
  border: 1px solid var(--news-divider);
  overflow: hidden;
  transition: transform var(--transition-base, 0.35s ease),
              box-shadow var(--transition-base, 0.35s ease);
}

.page-news .insight-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.1);
  border-color: var(--news-accent-cyan);
}

.page-news .insight-card .card-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-news .insight-card .card-body {
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem) var(--spacing-lg, 2rem);
}

.page-news .insight-card .card-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: var(--fw-heading, 700);
  font-size: var(--fs-heading-sm, clamp(1.125rem, 1.8vw, 1.5rem));
  color: var(--news-accent-blue);
  margin: 0 0 0.4rem 0;
  letter-spacing: var(--ls-heading, -0.02em);
}

.page-news .insight-card .card-summary {
  font-size: var(--fs-body, 1rem);
  color: var(--news-text-soft);
  margin: 0 0 0.3rem 0;
  line-height: 1.5;
}

.page-news .insight-source {
  font-size: var(--fs-caption, 0.75rem);
  color: var(--news-text-muted);
  font-style: italic;
}

.page-news .insights-note {
  font-size: var(--fs-caption, 0.75rem);
  color: var(--news-text-muted);
  max-width: 700px;
  line-height: 1.5;
}

.page-news .insights-note a {
  color: var(--news-accent-cyan);
  text-decoration: none;
}

.page-news .insights-note a:hover {
  text-decoration: underline;
}

/* --- 相关链接区域 --- */
.page-news .section--related {
  padding-top: 0;
  padding-bottom: var(--spacing-xl, 4rem);
}

.page-news .related-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-md, 1rem);
  flex-wrap: wrap;
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  background: var(--news-card-bg);
  border-radius: var(--news-radius);
  box-shadow: var(--news-shadow);
  border: 1px solid var(--news-divider);
}

.page-news .related-label {
  font-size: var(--fs-body, 1rem);
  font-weight: var(--fw-special, 500);
  color: var(--news-text-soft);
}

.page-news .related-link {
  font-size: var(--fs-special, 0.875rem);
  color: var(--news-accent-blue);
  text-decoration: none;
  padding: 0.25rem 0.8rem;
  border: 1px solid var(--news-divider);
  border-radius: 20px;
  transition: background var(--transition-fast, 0.2s ease),
              border-color var(--transition-fast, 0.2s ease);
}

.page-news .related-link:hover {
  background: var(--news-accent-blue);
  color: #FFFFFF;
  border-color: var(--news-accent-blue);
}

/* --- 响应式：桌面 ≥768px --- */
@media (min-width: 768px) {
  .page-news .news-hero {
    padding: var(--spacing-2xl, 6rem) var(--spacing-xl, 4rem);
    margin: 0 auto var(--spacing-2xl, 6rem);
    max-width: calc(var(--max-width, 1200px) - 2rem);
  }

  .page-news .hero-title {
    font-size: var(--fs-heading-xl, clamp(2.75rem, 6vw, 6rem));
  }

  .page-news .hero-subtitle {
    font-size: 1.125rem;
  }

  .page-news .timeline-rail {
    padding-left: calc(var(--news-timeline-width) + 40px);
  }

  .page-news .timeline-rail::before {
    left: calc(var(--news-timeline-width) / 2 + 40px - 2px);
  }

  .page-news .timeline-node-wrap {
    margin-left: -40px;
  }

  .page-news .timeline-card {
    margin-left: calc(var(--spacing-xl, 4rem) + 0.5rem);
  }

  .page-news .card-body {
    padding: var(--spacing-lg, 2rem) var(--spacing-xl, 4rem) var(--spacing-xl, 4rem);
  }

  .page-news .insights-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-news .updates-list {
    max-width: 850px;
  }

  .page-news .update-item {
    padding: var(--spacing-lg, 2rem) var(--spacing-xl, 4rem);
  }

  .page-news .section {
    padding: var(--spacing-2xl, 6rem) 0;
  }
}

/* --- 桌面大屏 ≥1024px --- */
@media (min-width: 1024px) {
  .page-news .timeline-item {
    margin-bottom: 5rem;
  }

  .page-news .timeline-node {
    width: 48px;
    height: 48px;
    font-size: 1.125rem;
  }

  .page-news .card-title {
    font-size: 1.5rem;
  }

  .page-news .news-hero {
    padding: 6rem 5rem;
  }
}

/* --- 减少动效偏好 --- */
@media (prefers-reduced-motion: reduce) {
  .page-news *,
  .page-news *::before,
  .page-news *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    transform: none !important;
  }
}