/* ===== 页面专属：新闻动态 /updates/ ===== */
.page-news {
  --pn-gap: 2rem;
  --pn-section-gap: 3.5rem;
  --pn-card-radius: 12px;
  --pn-timeline-line-color: color-mix(in srgb, var(--color-accent-blue) 35%, transparent);
  --pn-timeline-dot-color: var(--color-accent-blue);
  --pn-timeline-dot-glow: 0 0 8px var(--color-accent-blue);
  --pn-fade-duration: 0.5s;
  --pn-fade-delay-base: 0.15s;
  --pn-section-max-width: 960px;
  --pn-wide-max-width: 1100px;

  display: block;
  width: 100%;
  background-color: var(--color-primary-bg);
  color: var(--color-text-primary);
  font-family: var(--body-font, Inter, sans-serif);
  line-height: 1.6;
}

/* ---------- 内部容器 ---------- */
.page-news__inner {
  max-width: var(--content-max-width, 1200px);
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  display: flex;
  flex-direction: column;
  gap: var(--pn-section-gap);
}

/* ---------- 面包屑 ---------- */
.page-news__breadcrumb {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  letter-spacing: 0.02em;
}

.page-news__breadcrumb a {
  color: var(--color-accent-blue);
  text-decoration: none;
  transition: color 0.2s;
}

.page-news__breadcrumb a:hover {
  color: var(--color-accent-green);
  text-decoration: underline;
}

.page-news__breadcrumb-sep {
  color: var(--color-text-secondary);
  opacity: 0.5;
}

.page-news__breadcrumb [aria-current="page"] {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* ---------- 头部 ---------- */
.page-news__hero {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-news__hero-title {
  font-family: var(--heading-font, "Playfair Display", serif);
  font-weight: var(--heading-weight, 900);
  font-size: clamp(2rem, 5.5vw, 3.2rem);
  line-height: 1.15;
  margin: 0;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.page-news__hero-desc {
  font-size: 1rem;
  color: var(--color-accent-blue);
  margin: 0;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.page-news__hero-visual {
  margin-top: 0.5rem;
  border-radius: var(--pn-card-radius);
  overflow: hidden;
  background: var(--color-card-bg);
}

.page-news__hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--pn-card-radius);
}

/* ---------- 通用章节 ---------- */
.page-news__section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.page-news__section-intro {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-news__section-icon {
  width: 64px;
  height: auto;
  aspect-ratio: 1/1;
  object-fit: contain;
  border-radius: 8px;
  background: var(--color-card-bg);
  padding: 4px;
}

.page-news__section-heading {
  font-family: var(--heading-font, "Playfair Display", serif);
  font-weight: var(--heading-weight, 900);
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  line-height: 1.2;
  margin: 0;
  color: var(--color-text-primary);
}

.page-news__section-desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0;
}

/* ---------- 时间线 ---------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 2.2rem;
}

/* 垂直线条 */
.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 10px;
  width: 2px;
  background: var(--pn-timeline-line-color);
  border-radius: 2px;
}

.timeline__item {
  position: relative;
  padding: 0 0 2rem 0;
}

.timeline__item:last-child {
  padding-bottom: 0;
}

/* 圆形标记 */
.timeline__marker {
  position: absolute;
  left: -2.2rem;
  top: 0.5rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--pn-timeline-dot-color);
  box-shadow: var(--pn-timeline-dot-glow);
  border: 2px solid var(--color-primary-bg);
  z-index: 1;
  transform: translateX(-50%);
  left: 10px;
}

.timeline__card {
  background: var(--color-card-bg);
  border-radius: var(--pn-card-radius);
  padding: 0;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  transition: box-shadow 0.25s, border-color 0.25s;
  border: 1px solid transparent;
}

.timeline__card:hover {
  box-shadow: 0 4px 24px rgba(0, 212, 255, 0.15);
  border-color: var(--color-divider);
}

.timeline__card details {
  display: block;
}

.timeline__card summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 1rem;
  transition: background 0.2s;
  user-select: none;
}

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

.timeline__card summary:hover {
  background: rgba(0, 212, 255, 0.04);
}

.timeline__version-num {
  font-family: var(--numeric-font, "JetBrains Mono", monospace);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-accent-green);
  background: rgba(57, 255, 20, 0.1);
  padding: 0.2em 0.6em;
  border-radius: 4px;
  white-space: nowrap;
  line-height: 1.4;
}

.timeline__card-title {
  flex: 1;
  color: var(--color-text-primary);
  font-weight: 600;
}

/* 展开指示符（自定义） */
.timeline__card summary::after {
  content: "+";
  font-family: var(--numeric-font, "JetBrains Mono", monospace);
  font-size: 1.1rem;
  color: var(--color-accent-blue);
  transition: transform 0.25s;
  flex-shrink: 0;
}

.timeline__card details[open] summary::after {
  content: "−";
  transform: rotate(0deg);
}

.timeline__detail {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  border-top: 1px solid var(--color-divider);
  margin-top: 0;
  animation: pnFadeIn 0.3s ease-out;
}

.timeline__detail p {
  margin: 0.75rem 0 0;
}

/* ---------- 分割布局（宽窄交替） ---------- */
.page-news__split {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: flex-start;
}

.page-news__split--reverse {
  flex-direction: column;
}

.page-news__split-text {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-news__split-text p {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.7;
}

.page-news__split-visual {
  flex-shrink: 0;
  width: 100%;
  max-width: 400px;
  border-radius: var(--pn-card-radius);
  overflow: hidden;
  background: var(--color-chart-bg);
}

.page-news__split-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--pn-card-radius);
}

/* ---------- 强调按钮（复用全局样式增强） ---------- */
.page-news .btn-accent {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: transparent;
  color: var(--color-accent-blue);
  border: 1px solid var(--color-accent-blue);
  padding: 0.55rem 1.4rem;
  border-radius: 6px;
  font-family: var(--body-font, Inter, sans-serif);
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  align-self: flex-start;
}

.page-news .btn-accent:hover {
  background: var(--color-accent-blue);
  color: var(--color-primary-bg);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
}

/* ---------- 底部交叉导航 ---------- */
.page-news__cross-nav {
  border-top: 1px solid var(--color-divider);
  padding-top: 1.5rem;
  margin-top: 0.5rem;
}

.page-news__cross-nav p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin: 0;
}

.page-news__cross-nav a {
  color: var(--color-accent-blue);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.page-news__cross-nav a:hover {
  color: var(--color-accent-green);
  text-decoration: underline;
}

/* ---------- 动画关键帧 ---------- */
@keyframes pnFadeIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pnSlideUpFade {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 卡片渐入（data-animate 钩子） */
.timeline__card[data-animate="fade-up"] {
  animation: pnSlideUpFade var(--pn-fade-duration) ease-out both;
}

.timeline__item:nth-child(1) .timeline__card[data-animate="fade-up"] {
  animation-delay: calc(var(--pn-fade-delay-base) * 1);
}

.timeline__item:nth-child(2) .timeline__card[data-animate="fade-up"] {
  animation-delay: calc(var(--pn-fade-delay-base) * 2);
}

.timeline__item:nth-child(3) .timeline__card[data-animate="fade-up"] {
  animation-delay: calc(var(--pn-fade-delay-base) * 3);
}

.timeline__item:nth-child(4) .timeline__card[data-animate="fade-up"] {
  animation-delay: calc(var(--pn-fade-delay-base) * 4);
}

.timeline__item:nth-child(5) .timeline__card[data-animate="fade-up"] {
  animation-delay: calc(var(--pn-fade-delay-base) * 5);
}

/* 静止状态下内容完整可读：动画结束保持最终状态 */
.timeline__card[data-animate="fade-up"] {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 桌面端媒体查询 ---------- */
@media (min-width: 768px) {
  .page-news__inner {
    padding: 2rem 2rem 4rem;
    gap: 4rem;
  }

  .page-news__hero {
    gap: 1rem;
  }

  .page-news__hero-visual {
    margin-top: 0.25rem;
  }

  .page-news__section {
    max-width: var(--pn-section-max-width);
    margin-left: 0;
    margin-right: auto;
  }

  /* 宽章节占更多空间 */
  .page-news__section--wide {
    max-width: var(--pn-wide-max-width);
  }

  .page-news__section--insight {
    max-width: var(--pn-wide-max-width);
  }

  /* 时间线部分窄一些，符合非对称节奏 */
  .page-news__section--timeline {
    max-width: var(--pn-section-max-width);
  }

  .page-news__section-icon {
    width: 80px;
  }

  .timeline {
    padding-left: 2.8rem;
  }

  .timeline::before {
    left: 12px;
  }

  .timeline__marker {
    left: 12px;
    width: 16px;
    height: 16px;
  }

  .timeline__card summary {
    padding: 1.1rem 1.5rem;
    font-size: 1.0625rem;
  }

  .timeline__detail {
    padding: 0 1.5rem 1.5rem;
    font-size: 0.9375rem;
  }

  .timeline__version-num {
    font-size: 0.875rem;
  }

  /* 分割布局桌面端并排 */
  .page-news__split {
    flex-direction: row;
    gap: 2.5rem;
    align-items: center;
  }

  .page-news__split--reverse {
    flex-direction: row;
  }

  .page-news__split-text {
    flex: 1 1 55%;
  }

  .page-news__split-visual {
    flex: 0 0 auto;
    width: auto;
    max-width: 45%;
  }

  .page-news__split-img {
    width: 100%;
    height: auto;
  }

  /* 行业观察部分图在左，文在右（reverse） */
  .page-news__split--reverse .page-news__split-visual {
    order: 0;
  }

  .page-news__split--reverse .page-news__split-text {
    order: 1;
  }

  .page-news__cross-nav {
    max-width: var(--pn-section-max-width);
  }

  /* 悬停时卡片阴影更深 */
  .timeline__card:hover {
    box-shadow: 0 6px 32px rgba(0, 212, 255, 0.2);
  }
}

/* ---------- 较大桌面端微调 ---------- */
@media (min-width: 1200px) {
  .page-news__inner {
    padding: 2.5rem 2.5rem 5rem;
    gap: 5rem;
  }

  .page-news__section--timeline {
    padding-left: 2rem;
  }

  .timeline__card summary {
    padding: 1.25rem 1.75rem;
  }

  .timeline__detail {
    padding: 0 1.75rem 1.75rem;
  }
}

/* ---------- 减少动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  .timeline__card[data-animate="fade-up"] {
    animation: none !important;
    opacity: 1;
    transform: none;
  }

  .timeline__detail {
    animation: none;
  }

  .timeline__card summary::after {
    transition: none;
  }

  .timeline__card,
  .page-news .btn-accent {
    transition: none;
  }
}

.page-news {
  --body-font: inherit;
  --heading-font: inherit;
  --heading-weight: 600;
  --numeric-font: inherit;
}