/* ===== 内容日志页面专属样式 ===== */
/* 作用域：.page-news 所有选择器均限定在此类名下 */

/* ---------- 页面级变量 ---------- */
.page-news {
  --page-timeline-line-color: var(--color-gold, #FFD700);
  --page-timeline-dot-size: 14px;
  --page-timeline-line-width: 3px;
  --page-card-border-color: var(--color-deep-green, #1B5E20);
  --page-card-border-width: 2px;
  --page-card-radius: var(--radius-md, 8px);
  --page-meta-font: var(--font-headings, 'Oswald', sans-serif);
  --page-body-gap: var(--spacing-lg, 40px);
  --page-section-gap: var(--spacing-xl, 64px);

  /* 颜色强化 */
  --page-gold: var(--color-gold, #FFD700);
  --page-deep-green: var(--color-deep-green, #1B5E20);
  --page-dark-red: var(--color-dark-red, #8B0000);
  --page-bg-white: var(--color-bg-white, #FFFFFF);
  --page-text-dark: var(--color-text-dark, #333333);
  --page-surface-light: var(--color-surface-light, #F5F5F5);
  --page-shadow-card: var(--shadow-card, 0 2px 12px rgba(0,0,0,0.06));
  --page-shadow-hover: var(--shadow-hover, 0 8px 28px rgba(0,0,0,0.10));
}

/* ---------- 容器 ---------- */
.page-news__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md, 24px) var(--spacing-md, 24px) var(--spacing-xl, 64px);
}

/* ---------- 面包屑 ---------- */
.page-news .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs, 8px);
  font-size: var(--fs-small, 14px);
  color: var(--page-text-dark);
  margin-bottom: var(--spacing-md, 24px);
  letter-spacing: 0.02em;
}

.page-news .breadcrumb a {
  color: var(--page-deep-green);
  text-decoration: none;
  transition: color var(--transition-fast, 180ms ease);
  font-weight: 500;
}

.page-news .breadcrumb a:hover,
.page-news .breadcrumb a:focus {
  color: var(--page-gold);
  text-decoration: underline;
  outline: none;
}

.page-news .breadcrumb__sep {
  color: var(--page-deep-green);
  font-weight: 700;
  margin: 0 2px;
}

.page-news .breadcrumb [aria-current="page"] {
  color: var(--page-text-dark);
  font-weight: 400;
}

/* ---------- 页面标题 ---------- */
.page-news__header {
  margin-bottom: var(--spacing-sm, 16px);
  position: relative;
}

.page-news__heading {
  font-family: var(--font-headings, 'Oswald', sans-serif);
  font-size: var(--fs-h1, clamp(32px,5vw,52px));
  font-weight: 700;
  color: var(--page-deep-green);
  line-height: 1.1;
  letter-spacing: 0.03em;
  margin: 0 0 var(--spacing-xs, 8px) 0;
  position: relative;
  display: inline-block;
}

.page-news__heading::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--page-gold), var(--page-deep-green));
  margin-top: var(--spacing-xs, 8px);
}

.page-news__subtitle {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--fs-body, 16px);
  line-height: var(--lh-body, 1.6);
  color: var(--page-text-dark);
  max-width: 640px;
  margin: var(--spacing-xs, 8px) 0 0 0;
}

/* ---------- 顶部装饰图 ---------- */
.page-news__hero {
  margin-bottom: var(--spacing-xl, 64px);
  border-radius: var(--radius-md, 8px);
  overflow: hidden;
  background: var(--page-surface-light);
  box-shadow: var(--page-shadow-card);
}

.page-news__hero-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  object-position: center 40%;
}

/* ---------- 区块标题 ---------- */
.page-news__section {
  margin-bottom: var(--page-section-gap);
  scroll-margin-top: 80px;
}

.page-news__section--cases {
  margin-bottom: 0;
}

.page-news__section-title {
  font-family: var(--font-headings, 'Oswald', sans-serif);
  font-size: var(--fs-h2, clamp(24px,3.5vw,40px));
  font-weight: 700;
  color: var(--page-deep-green);
  line-height: 1.15;
  margin: 0 0 var(--spacing-xs, 8px) 0;
  letter-spacing: 0.02em;
}

.page-news__section-title::after {
  content: '';
  display: block;
  width: 50px;
  height: 3px;
  background: var(--page-gold);
  margin-top: var(--spacing-xs, 8px);
}

.page-news__section-desc {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--fs-body, 16px);
  line-height: var(--lh-body, 1.6);
  color: var(--page-text-dark);
  margin: var(--spacing-sm, 16px) 0 var(--spacing-lg, 40px) 0;
  max-width: 600px;
}

/* ===== 时间轴 ===== */
.page-news__timeline {
  position: relative;
  padding-left: calc(var(--page-timeline-dot-size) + 24px);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md, 24px);
}

/* 金色竖线 - 使用伪元素绘制 */
.page-news__timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc((var(--page-timeline-dot-size) + 4px) / 2);
  width: var(--page-timeline-line-width);
  background: linear-gradient(180deg,
    var(--page-gold) 0%,
    var(--page-gold) 80%,
    rgba(255, 215, 0, 0.2) 100%
  );
  border-radius: 2px;
  z-index: 0;
}

/* ---------- 时间轴条目 ---------- */
.timeline__item {
  position: relative;
  border: none;
  background: transparent;
  border-radius: var(--page-card-radius);
  transition: box-shadow var(--transition-med, 300ms ease);
}

/* 移除details默认三角 */
.timeline__item summary {
  list-style: none;
  cursor: pointer;
}

.timeline__item summary::-webkit-details-marker {
  display: none;
}

.timeline__item summary::marker {
  display: none;
  content: '';
}

/* ---------- 时间点圆点 ---------- */
.timeline__dot {
  position: absolute;
  left: calc(-1 * (var(--page-timeline-dot-size) + 24px) - 2px);
  top: 18px;
  width: var(--page-timeline-dot-size);
  height: var(--page-timeline-dot-size);
  border-radius: 50%;
  background: var(--page-gold);
  border: 3px solid var(--page-bg-white);
  box-shadow: 0 0 0 2px var(--page-gold), var(--page-shadow-card);
  z-index: 1;
  transition: transform var(--transition-fast, 180ms ease), box-shadow var(--transition-fast, 180ms ease);
  flex-shrink: 0;
}

.timeline__item[open] > .timeline__summary .timeline__dot {
  transform: scale(1.2);
  box-shadow: 0 0 0 4px var(--page-gold), var(--page-shadow-hover);
  background: var(--page-deep-green);
  border-color: var(--page-gold);
}

/* ---------- summary 区域 ---------- */
.timeline__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--spacing-sm, 16px);
  padding: var(--spacing-sm, 16px) var(--spacing-md, 24px);
  background: var(--page-bg-white);
  border: var(--page-card-border-width) solid var(--page-card-border-color);
  border-radius: var(--page-card-radius);
  transition: background var(--transition-fast, 180ms ease), border-color var(--transition-fast, 180ms ease), box-shadow var(--transition-fast, 180ms ease);
  box-shadow: var(--page-shadow-card);
  position: relative;
  z-index: 2;
}

.timeline__summary:hover,
.timeline__summary:focus-within {
  border-color: var(--page-gold);
  box-shadow: var(--page-shadow-hover);
  background: var(--page-surface-light);
}

.timeline__summary:focus-visible {
  outline: 3px solid var(--page-gold);
  outline-offset: 2px;
}

/* ---------- 元信息（版本+标签） ---------- */
.timeline__meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 60px;
  flex-shrink: 0;
}

.timeline__version {
  font-family: var(--page-meta-font);
  font-size: var(--fs-h3, clamp(20px,2.5vw,32px));
  font-weight: 700;
  color: var(--page-gold);
  line-height: 1;
  letter-spacing: 0.02em;
}

.timeline__tag {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--fs-tiny, 12px);
  font-weight: 600;
  color: var(--page-deep-green);
  background: rgba(27, 94, 32, 0.08);
  padding: 2px 10px;
  border-radius: 20px;
  display: inline-block;
  width: fit-content;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ---------- 预览标题区 ---------- */
.timeline__preview {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm, 16px);
  min-width: 120px;
}

.timeline__title {
  font-family: var(--font-headings, 'Oswald', sans-serif);
  font-size: clamp(16px, 2vw, 22px);
  font-weight: 600;
  color: var(--page-text-dark);
  line-height: 1.3;
  margin: 0;
  letter-spacing: 0.01em;
  transition: color var(--transition-fast, 180ms ease);
}

.timeline__summary:hover .timeline__title,
.timeline__item[open] .timeline__title {
  color: var(--page-deep-green);
}

.timeline__arrow {
  font-family: var(--page-meta-font);
  font-size: 24px;
  color: var(--page-gold);
  transition: transform var(--transition-med, 300ms ease), color var(--transition-fast, 180ms ease);
  flex-shrink: 0;
  line-height: 1;
}

.timeline__item[open] .timeline__arrow {
  transform: rotate(90deg);
  color: var(--page-deep-green);
}

/* ---------- 展开内容 ---------- */
.timeline__body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md, 24px);
  padding: var(--spacing-lg, 40px) var(--spacing-md, 24px) var(--spacing-md, 24px);
  background: var(--page-bg-white);
  border: var(--page-card-border-width) solid var(--page-card-border-color);
  border-top: none;
  border-radius: 0 0 var(--page-card-radius) var(--page-card-radius);
  margin-top: -2px;
  position: relative;
  z-index: 1;
  animation: timelineFadeIn 0.35s ease both;
}

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

.timeline__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm, 4px);
  box-shadow: var(--page-shadow-card);
  object-fit: cover;
  background: var(--page-surface-light);
}

.timeline__text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm, 16px);
}

.timeline__desc {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--fs-body, 16px);
  line-height: var(--lh-body, 1.6);
  color: var(--page-text-dark);
  margin: 0;
}

.timeline__features {
  margin: 0;
  padding: 0 0 0 20px;
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--fs-small, 14px);
  line-height: 1.7;
  color: var(--page-text-dark);
}

.timeline__features li {
  margin-bottom: 4px;
}

.timeline__features li::marker {
  color: var(--page-gold);
}

/* ---------- 数据指标组 ---------- */
.timeline__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md, 24px);
  padding: var(--spacing-sm, 16px) 0;
  border-top: 1px solid var(--color-border, rgba(27,94,32,0.15));
}

.page-news .metric {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 80px;
}

.page-news .metric-value {
  font-family: var(--page-meta-font);
  font-size: var(--fs-metric, clamp(36px,6vw,56px));
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-news .metric-label {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--fs-small, 14px);
  color: var(--page-text-dark);
  font-weight: 400;
  line-height: 1.3;
}

/* ---------- 内部链接导航 ---------- */
.page-news__internal-links {
  margin-top: var(--spacing-xl, 64px);
  padding-top: var(--spacing-lg, 40px);
  border-top: 2px solid var(--color-border-gold, rgba(255,215,0,0.3));
}

.page-news__links-title {
  font-family: var(--font-headings, 'Oswald', sans-serif);
  font-size: var(--fs-h3, clamp(20px,2.5vw,32px));
  font-weight: 700;
  color: var(--page-deep-green);
  margin: 0 0 var(--spacing-md, 24px) 0;
  letter-spacing: 0.02em;
}

.page-news__links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--spacing-sm, 16px);
}

.page-news .card--link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm, 16px);
  padding: var(--spacing-md, 24px) var(--spacing-sm, 16px);
  background: var(--page-bg-white);
  border: var(--page-card-border-width) solid var(--page-card-border-color);
  border-radius: var(--page-card-radius);
  text-decoration: none;
  color: var(--page-text-dark);
  box-shadow: var(--page-shadow-card);
  transition: border-color var(--transition-fast, 180ms ease), box-shadow var(--transition-med, 300ms ease), transform var(--transition-fast, 180ms ease);
}

.page-news .card--link:hover,
.page-news .card--link:focus {
  border-color: var(--page-gold);
  box-shadow: var(--page-shadow-hover);
  transform: translateY(-2px);
}

.page-news .card--link:focus-visible {
  outline: 3px solid var(--page-gold);
  outline-offset: 2px;
}

.page-news .card__icon {
  font-size: 28px;
  line-height: 1;
  flex-shrink: 0;
}

.page-news .card__label {
  font-family: var(--font-headings, 'Oswald', sans-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--page-deep-green);
  flex: 1;
}

.page-news .card__arrow {
  font-family: var(--page-meta-font);
  font-size: 20px;
  color: var(--page-gold);
  transition: transform var(--transition-fast, 180ms ease);
  flex-shrink: 0;
}

.page-news .card--link:hover .card__arrow,
.page-news .card--link:focus .card__arrow {
  transform: translateX(4px);
}

/* ---------- 按钮覆盖 ---------- */
.page-news .btn-outline.btn-small {
  font-family: var(--font-body, 'Inter', sans-serif);
  font-size: var(--fs-small, 14px);
  font-weight: 500;
  padding: 8px 20px;
  border: 2px solid var(--page-deep-green);
  border-radius: 4px;
  color: var(--page-deep-green);
  background: transparent;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  width: fit-content;
  transition: background var(--transition-fast, 180ms ease), color var(--transition-fast, 180ms ease), border-color var(--transition-fast, 180ms ease);
  cursor: pointer;
}

.page-news .btn-outline.btn-small:hover,
.page-news .btn-outline.btn-small:focus {
  background: var(--page-deep-green);
  color: var(--page-bg-white);
  border-color: var(--page-deep-green);
  outline: none;
}

.page-news .btn-outline.btn-small:focus-visible {
  outline: 3px solid var(--page-gold);
  outline-offset: 2px;
}

/* ===== 响应式：桌面端（≥768px） ===== */
@media (min-width: 768px) {
  .page-news__container {
    padding-left: calc(var(--nav-width, 200px) + var(--spacing-md, 24px) * 2);
    padding-top: var(--spacing-lg, 40px);
  }

  .page-news__header {
    display: flex;
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--spacing-lg, 40px);
  }

  .page-news__heading {
    margin-bottom: 0;
  }

  .page-news__heading::after {
    width: 80px;
    height: 5px;
  }

  .page-news__subtitle {
    margin: 0;
    text-align: right;
    font-size: 17px;
    max-width: 400px;
  }

  .page-news__hero {
    margin-bottom: var(--spacing-xl, 64px);
    border-radius: var(--radius-lg, 16px);
  }

  .page-news__timeline {
    padding-left: calc(var(--page-timeline-dot-size) + 48px);
  }

  .page-news__timeline::before {
    left: calc((var(--page-timeline-dot-size) + 8px) / 2);
  }

  .timeline__dot {
    left: calc(-1 * (var(--page-timeline-dot-size) + 48px) - 4px);
    top: 24px;
    width: calc(var(--page-timeline-dot-size) + 4px);
    height: calc(var(--page-timeline-dot-size) + 4px);
  }

  .timeline__summary {
    padding: var(--spacing-md, 24px) var(--spacing-lg, 40px);
    gap: var(--spacing-md, 24px);
  }

  .timeline__meta {
    min-width: 80px;
  }

  .timeline__version {
    font-size: var(--fs-h2, clamp(24px,3.5vw,36px));
  }

  .timeline__tag {
    font-size: var(--fs-small, 14px);
  }

  .timeline__title {
    font-size: var(--fs-h3, clamp(20px,2.5vw,28px));
  }

  .timeline__arrow {
    font-size: 28px;
  }

  .timeline__body {
    flex-direction: row;
    padding: var(--spacing-lg, 40px) var(--spacing-lg, 40px) var(--spacing-lg, 40px);
  }

  .timeline__img {
    width: 45%;
    max-width: 500px;
    flex-shrink: 0;
  }

  .timeline__text {
    flex: 1;
  }

  .timeline__metrics {
    gap: var(--spacing-lg, 40px);
  }

  .page-news .metric-value {
    font-size: clamp(40px, 4vw, 60px);
  }

  .page-news__links-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md, 24px);
  }

  .page-news .card--link {
    padding: var(--spacing-lg, 40px) var(--spacing-md, 24px);
    flex-direction: column;
    text-align: center;
  }

  .page-news .card__icon {
    font-size: 36px;
  }

  .page-news .card__label {
    font-size: 20px;
  }

  .page-news .card__arrow {
    font-size: 24px;
  }

  .page-news__internal-links {
    margin-top: var(--spacing-xl, 80px);
    padding-top: var(--spacing-xl, 64px);
  }
}

/* ===== 桌面端大屏（≥1200px） ===== */
@media (min-width: 1200px) {
  .page-news__container {
    padding-right: calc(var(--spacing-xl, 64px) * 1.5);
  }

  .page-news__timeline {
    padding-left: calc(var(--page-timeline-dot-size) + 64px);
  }

  .timeline__dot {
    left: calc(-1 * (var(--page-timeline-dot-size) + 64px) - 6px);
    top: 28px;
  }

  .timeline__summary {
    padding: var(--spacing-lg, 40px) var(--spacing-xl, 64px);
  }

  .timeline__body {
    padding: var(--spacing-xl, 64px) var(--spacing-xl, 64px) var(--spacing-lg, 40px);
  }

  .page-news__section-title {
    font-size: 40px;
  }

  .page-news .card--link {
    padding: var(--spacing-xl, 64px) var(--spacing-md, 24px);
  }
}

/* ===== 微调：确保详情无JS时内容可见 ===== */
.page-news .timeline__item:not([open]) .timeline__body {
  display: none;
}

.page-news .timeline__item[open] .timeline__body {
  display: flex;
}

/* ===== 打印优化 ===== */
@media print {
  .page-news__container {
    padding: 0;
    max-width: 100%;
  }

  .timeline__summary {
    border-color: #ccc;
    box-shadow: none;
  }

  .timeline__body {
    display: flex !important;
    border-color: #ccc;
  }

  .timeline__dot {
    box-shadow: none;
    border-color: #999;
  }

  .page-news__timeline::before {
    background: #ccc;
  }

  .page-news .card--link {
    border-color: #ccc;
    box-shadow: none;
  }

  .page-news__hero {
    box-shadow: none;
  }
}