/* ===== page-news 专属样式 ===== */
.page-news {
  --timeline-line-color: rgba(0, 229, 255, 0.25);
  --timeline-dot-size: 12px;
  --card-radius: 8px;
  --card-transition: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  --accent-width: 4px;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  padding: var(--space-md) var(--space-sm) var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

/* 面包屑 */
.page-news .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
  padding: var(--space-xs) 0;
  flex-wrap: wrap;
}

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

.page-news .breadcrumb a:hover,
.page-news .breadcrumb a:focus-visible {
  color: var(--color-accent-gold);
  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;
}

/* 页面介绍区 */
.page-news__intro {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(0, 229, 255, 0.15);
  margin-bottom: var(--space-xs);
}

.page-news__intro .section-label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent-cyan);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.8;
}

.page-news__intro h1 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: var(--text-3xl);
  color: var(--color-text-primary);
  line-height: 1.15;
  margin: 0;
  letter-spacing: -0.01em;
}

.page-news__intro-desc {
  font-family: var(--font-body);
  font-size: var(--text-md);
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 680px;
  margin: 0;
}

/* 时间线区块 */
.page-news__timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.page-news__timeline-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.page-news__timeline-header .section-label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent-gold);
  letter-spacing: 0.12em;
  opacity: 0.9;
}

.page-news__timeline-header h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--color-text-primary);
  margin: 0;
  line-height: 1.2;
}

.page-news__timeline-sub {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
  max-width: 600px;
}

/* 时间线条目容器 —— 垂直装饰线 */
.page-news__timeline-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  position: relative;
  padding-left: calc(var(--space-md) + 12px);
}

.page-news__timeline-items::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 2px;
  background: linear-gradient(180deg,
    var(--color-accent-cyan) 0%,
    rgba(0, 229, 255, 0.3) 40%,
    rgba(255, 215, 0, 0.3) 70%,
    var(--color-accent-gold) 100%
  );
  border-radius: 1px;
}

/* 每个时间线卡片 */
.timeline-card {
  position: relative;
  width: 100%;
  transition: transform var(--card-transition), box-shadow 0.3s ease;
  will-change: transform;
}

.timeline-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-glow-cyan);
}

.timeline-card:focus-within {
  transform: scale(1.02);
  box-shadow: var(--shadow-glow-cyan);
}

/* 时间线小圆点 */
.timeline-card::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-md) - 12px - 8px);
  top: var(--space-md);
  width: var(--timeline-dot-size);
  height: var(--timeline-dot-size);
  background: var(--color-accent-cyan);
  border: 2px solid var(--color-base-dark);
  border-radius: 50%;
  z-index: 2;
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.4);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.timeline-card:hover::before {
  background: var(--color-accent-gold);
  box-shadow: 0 0 12px rgba(255, 215, 0, 0.5);
}

.timeline-card__inner {
  position: relative;
  background: var(--color-surface-dark);
  border-radius: var(--card-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(0, 229, 255, 0.08);
  transition: border-color 0.3s ease;
}

.timeline-card:hover .timeline-card__inner {
  border-color: rgba(0, 229, 255, 0.25);
}

/* 彩色边条 */
.timeline-card__accent {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--accent-width);
  height: 100%;
  background: linear-gradient(180deg, var(--color-accent-cyan), var(--color-accent-gold));
  border-radius: var(--card-radius) 0 0 var(--card-radius);
  z-index: 1;
}

/* 版本号标签 */
.timeline-card__version {
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-base-dark);
  background: var(--color-accent-gold);
  padding: 2px 10px;
  border-radius: 4px;
  letter-spacing: 0.04em;
  z-index: 3;
  line-height: 1.5;
  box-shadow: 0 0 8px rgba(255, 215, 0, 0.3);
}

.timeline-card:nth-child(even) .timeline-card__version {
  background: var(--color-accent-cyan);
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.3);
}

/* 卡片内容 */
.timeline-card__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-md) var(--space-sm);
  padding-left: calc(var(--space-md) + var(--accent-width) + 4px);
  position: relative;
  z-index: 0;
}

.timeline-card__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-text-primary);
  margin: 0;
  line-height: 1.3;
  padding-right: 80px;
}

.timeline-card__summary {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
  max-width: 640px;
}

.timeline-card__img {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 400 / 250;
  object-fit: cover;
  border-radius: 6px;
  margin-top: var(--space-xs);
  background: var(--color-surface-medium);
  display: block;
}

/* 可展开正文 */
.timeline-card__body {
  display: none;
  flex-direction: column;
  gap: var(--space-sm);
  padding-top: var(--space-xs);
  border-top: 1px solid rgba(0, 229, 255, 0.1);
  margin-top: var(--space-xs);
}

.timeline-card__body p {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

.timeline-card[data-expanded] .timeline-card__body {
  display: flex;
}

/* 展开/收起按钮 */
.timeline-card__toggle {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--space-xs);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent-cyan);
  background: transparent;
  border: 1px solid var(--color-accent-cyan);
  padding: 6px 16px;
  border-radius: 4px;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.timeline-card__toggle:hover,
.timeline-card__toggle:focus-visible {
  background: var(--color-accent-cyan);
  color: var(--color-base-dark);
  border-color: var(--color-accent-cyan);
}

.timeline-card__toggle-icon {
  transition: transform 0.35s var(--ease-elastic);
  flex-shrink: 0;
}

.timeline-card[data-expanded] .timeline-card__toggle-icon {
  transform: rotate(180deg);
}

.timeline-card__toggle-text {
  white-space: nowrap;
}

/* 分隔线 */
.page-news .glow-line {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent-cyan), var(--color-accent-gold), transparent);
  width: 100%;
  max-width: 300px;
  margin: var(--space-sm) 0;
  opacity: 0.6;
  border: none;
}

/* 内容索引区块 */
.page-news__index {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.page-news__index-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.page-news__index-header .section-label {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent-gold);
  letter-spacing: 0.12em;
  opacity: 0.9;
}

.page-news__index-header h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-2xl);
  color: var(--color-text-primary);
  margin: 0;
  line-height: 1.2;
}

.page-news__index-sub {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
  max-width: 600px;
}

/* 索引网格 */
.page-news__index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

/* 索引卡片（切角面板） */
.index-card {
  background: var(--color-surface-dark);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  position: relative;
  border: 1px solid rgba(0, 229, 255, 0.08);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.index-card:hover {
  border-color: rgba(0, 229, 255, 0.25);
  box-shadow: var(--shadow-glow-cyan);
}

.index-card__tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs, 0.75rem);
  color: var(--color-accent-gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.8;
}

.index-card__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-md);
  color: var(--color-text-primary);
  margin: 0;
  line-height: 1.3;
}

.index-card__desc {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
  flex: 1;
}

.index-card__link {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent-cyan);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  border: none;
  background: transparent;
  cursor: pointer;
  transition: color 0.25s ease;
}

.index-card__link:hover,
.index-card__link:focus-visible {
  color: var(--color-accent-gold);
  text-decoration: underline;
}

/* 联系备注 */
.page-news__contact-note {
  margin-top: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-surface-medium);
  border-radius: 8px;
  border-left: 3px solid var(--color-accent-gold);
}

.page-news__contact-note p {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

.page-news__contact-note a {
  color: var(--color-accent-cyan);
  text-decoration: underline;
  transition: color 0.2s ease;
}

.page-news__contact-note a:hover {
  color: var(--color-accent-gold);
}

/* ===== 响应式：平板及以上 ===== */
@media (min-width: 600px) {
  .page-news {
    padding: var(--space-md) var(--space-lg) var(--space-xl);
    gap: var(--space-xl);
  }

  .page-news__intro h1 {
    font-size: var(--text-3xl);
  }

  .page-news__timeline-items {
    padding-left: calc(var(--space-lg) + 16px);
  }

  .timeline-card::before {
    left: calc(-1 * var(--space-lg) - 16px - 8px);
    top: var(--space-lg);
  }

  .timeline-card__content {
    padding: var(--space-lg);
    padding-left: calc(var(--space-lg) + var(--accent-width) + 8px);
  }

  .timeline-card__title {
    font-size: var(--text-xl);
    padding-right: 100px;
  }

  .timeline-card__img {
    max-width: 360px;
  }

  .page-news__index-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
  }

  .index-card {
    padding: var(--space-lg);
  }

  .index-card__title {
    font-size: var(--text-lg);
  }
}

/* ===== 响应式：桌面 ===== */
@media (min-width: 1024px) {
  .page-news {
    padding: var(--space-lg) var(--space-xl) var(--space-2xl, 4rem);
    gap: var(--space-xl);
  }

  .page-news__intro {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-lg);
    padding-bottom: var(--space-lg);
  }

  .page-news__intro .section-label {
    font-size: var(--text-base);
    align-self: flex-start;
    margin-top: 6px;
  }

  .page-news__intro h1 {
    font-size: 3.8rem;
    max-width: 700px;
  }

  .page-news__intro-desc {
    font-size: var(--text-lg);
    max-width: 500px;
    text-align: right;
  }

  .page-news__timeline-header {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-news__timeline-header h2 {
    font-size: var(--text-3xl);
  }

  .page-news__timeline-sub {
    font-size: var(--text-md);
    text-align: right;
    max-width: 420px;
  }

  .page-news__timeline-items {
    padding-left: calc(var(--space-xl) + 24px);
    gap: var(--space-xl);
  }

  .timeline-card::before {
    left: calc(-1 * var(--space-xl) - 24px - 10px);
    width: 14px;
    height: 14px;
    top: var(--space-lg);
  }

  .timeline-card__content {
    padding: var(--space-lg) var(--space-xl);
    padding-left: calc(var(--space-xl) + var(--accent-width) + 12px);
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
  }

  .timeline-card__title {
    font-size: var(--text-xl);
    padding-right: 120px;
    width: 100%;
  }

  .timeline-card__summary {
    flex: 1;
    min-width: 240px;
    max-width: 480px;
  }

  .timeline-card__img {
    max-width: 280px;
    margin-top: 0;
    margin-left: auto;
  }

  .timeline-card__body {
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
  }

  .timeline-card__body p {
    flex: 1;
    min-width: 200px;
  }

  .timeline-card__toggle {
    width: 100%;
    justify-content: center;
  }

  .page-news__index-header {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-news__index-header h2 {
    font-size: var(--text-3xl);
  }

  .page-news__index-sub {
    font-size: var(--text-md);
    text-align: right;
    max-width: 420px;
  }

  .page-news__index-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
  }

  .index-card {
    padding: var(--space-lg) var(--space-md);
  }

  .page-news__contact-note {
    display: flex;
    justify-content: center;
    padding: var(--space-lg) var(--space-xl);
  }

  .page-news__contact-note p {
    font-size: var(--text-base);
    max-width: 720px;
    text-align: center;
  }
}

/* ===== 交互增强：减少动效 ===== */
@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;
  }
}

.page-news {
  --space-2xl: var(--space-xl);
  --text-xs: 1rem;
}