/* =========================================
   page-news.css  — 文章中心页面专属样式
   作用域限定：.page-news
   移动端优先 + 桌面增强
   ========================================= */

/* ---- CSS 变量（page-news 作用域） ---- */
.page-news {
  --news-gap: 32px;
  --news-card-radius: 4px;
  --news-timeline-width: 3px;
  --news-dot-size: 16px;
  --news-index-font: 'Impact', 'Montserrat Black', sans-serif;
  --news-content-max: 720px;
  --news-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  display: block;
  width: 100%;
}

/* ---- 页面头部 ---- */
.page-news__header {
  padding: 20px 0 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.page-news__title {
  font-family: var(--font-heading);
  font-size: clamp(36px, 10vw, 64px);
  color: var(--color-red);
  margin: 12px 0 4px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  transform: skewX(-8deg);
  transform-origin: left center;
}

.page-news__subtitle {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0 0 20px;
  letter-spacing: 0.3px;
}

/* ---- 面包屑 ---- */
.page-news .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.page-news .breadcrumbs__link {
  color: var(--color-blue);
  text-decoration: none;
  transition: color var(--transition-speed);
}

.page-news .breadcrumbs__link:hover {
  color: var(--color-yellow);
}

.page-news .breadcrumbs__separator {
  color: rgba(255, 255, 255, 0.2);
  font-size: 12px;
}

.page-news .breadcrumbs__current {
  color: var(--color-text-secondary);
}

/* ---- 筛选按钮组 ---- */
.page-news__filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
  padding-bottom: 4px;
}

.page-news__filter-btn {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 18px;
  border: 1.5px solid var(--color-blue);
  background: transparent;
  color: var(--color-blue);
  cursor: pointer;
  border-radius: 0;
  transition: all var(--transition-speed);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.page-news__filter-btn:hover {
  background: var(--color-blue);
  color: #fff;
}

.page-news__filter-btn.is-active {
  background: var(--color-red);
  border-color: var(--color-red);
  color: #fff;
}

/* ---- 时间轴 + 文章区 外层容器 ---- */
.page-news__timeline-wrap {
  display: flex;
  position: relative;
  padding-top: 32px;
  padding-bottom: 48px;
  gap: 0;
}

/* ---- 时间轴（左侧） ---- */
.page-news__timeline {
  position: relative;
  flex: 0 0 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 28px;
}

.page-news__timeline-rail {
  display: block;
  width: var(--news-timeline-width);
  height: 100%;
  background: linear-gradient(180deg, var(--color-red), var(--color-blue));
  border-radius: 2px;
  position: absolute;
  top: 0;
  bottom: 0;
}

.page-news__timeline-dot {
  display: block;
  width: var(--news-dot-size);
  height: var(--news-dot-size);
  border-radius: 50%;
  background: var(--color-red);
  border: 3px solid var(--color-bg-dark);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  box-shadow: 0 0 0 2px var(--color-red);
}

.page-news__timeline-dot:nth-of-type(2) {
  background: var(--color-blue);
  box-shadow: 0 0 0 2px var(--color-blue);
  border-color: var(--color-bg-dark);
}

.page-news__timeline-dot:nth-of-type(3) {
  background: var(--color-yellow);
  box-shadow: 0 0 0 2px var(--color-yellow);
  border-color: var(--color-bg-dark);
}

/* ---- 文章列表 ---- */
.page-news__articles {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 36px;
  padding-left: 20px;
}

/* ---- 单张卡片 ---- */
.page-news__card {
  position: relative;
  display: flex;
  gap: 16px;
  background: var(--color-bg-card);
  border-left: 3px solid var(--color-red);
  padding: 20px 20px 16px 20px;
  transition: box-shadow 0.3s ease, transform 0.25s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.page-news__card:hover {
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.5);
  transform: translateX(4px);
}

/* 按主题区分左框颜色 */
.page-news__card[data-topic="schedule"] {
  border-left-color: var(--color-red);
}

.page-news__card[data-topic="member"] {
  border-left-color: var(--color-blue);
}

.page-news__card[data-topic="round"] {
  border-left-color: var(--color-yellow);
}

.page-news__card[data-topic="all"] {
  border-left-color: var(--color-text-secondary);
}

/* ---- 卡片编号（等宽索引） ---- */
.page-news__card-index {
  font-family: 'Courier New', monospace;
  font-size: 28px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.08);
  line-height: 1;
  flex-shrink: 0;
  width: 36px;
  text-align: right;
  margin-top: 2px;
  letter-spacing: -1px;
}

/* ---- 卡片主体 ---- */
.page-news__card-body {
  flex: 1;
  min-width: 0;
}

/* ---- 图标 ---- */
.page-news__card-icon {
  margin-bottom: 8px;
  display: inline-block;
}

.page-news__icon-img {
  display: block;
  width: 48px;
  height: 48px;
  object-fit: contain;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: var(--color-bg-dark);
  padding: 4px;
}

/* ---- 卡片标题 ---- */
.page-news__card-title {
  font-family: var(--font-heading);
  font-size: clamp(20px, 4vw, 28px);
  color: var(--color-text-primary);
  margin: 0 0 8px;
  line-height: 1.15;
  transform: skewX(-6deg);
  transform-origin: left center;
  letter-spacing: -0.01em;
}

/* ---- 卡片内容（可折叠区域） ---- */
.page-news__card-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--news-transition), opacity 0.3s ease;
  opacity: 0;
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
}

.page-news__card-content p {
  margin: 0 0 12px;
}

.page-news__card-content p:last-child {
  margin-bottom: 0;
}

/* 展开状态 */
.page-news__card.is-open .page-news__card-content {
  max-height: 600px;
  opacity: 1;
}

/* ---- 元信息 ---- */
.page-news__card-meta {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.35);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 10px;
  margin-top: 12px !important;
  letter-spacing: 0.3px;
}

/* ---- 展开/收起按钮 ---- */
.page-news__card-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  background: none;
  border: none;
  padding: 6px 0;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-blue);
  cursor: pointer;
  transition: color var(--transition-speed);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.page-news__card-toggle:hover {
  color: var(--color-yellow);
}

.page-news__toggle-text {
  display: inline;
}

.page-news__toggle-icon {
  display: inline-block;
  font-size: 18px;
  line-height: 1;
  transition: transform 0.3s ease;
  font-weight: 700;
}

.page-news__card.is-open .page-news__toggle-icon {
  transform: rotate(45deg);
}

.page-news__card.is-open .page-news__toggle-text {
  content: "收起";
}

/* ---- 内联链接 ---- */
.page-news__inline-link {
  color: var(--color-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}

.page-news__inline-link:hover {
  color: var(--color-yellow);
  border-bottom-color: var(--color-yellow);
}

/* ---- 底部区域 ---- */
.page-news__bottom-cta {
  padding-top: 8px;
  padding-bottom: 40px;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.page-news__trust {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0 0 20px;
  opacity: 0.7;
}

.page-news__bottom-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.page-news__bottom-links .btn {
  min-width: 140px;
  text-align: center;
  font-size: 14px;
  padding: 10px 24px;
  text-decoration: none;
  display: inline-block;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-news__bottom-links .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* ---- 背景装饰 ---- */
.page-news__bg-deco {
  position: fixed;
  bottom: 40px;
  right: 20px;
  width: 160px;
  height: 120px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.06;
  overflow: hidden;
}

.page-news__bg-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0.5;
}

/* =========================================
   移动端优先：窄屏适配
   ========================================= */
@media (max-width: 640px) {
  .page-news__header {
    padding: 12px 0 4px;
  }

  .page-news__title {
    font-size: 28px;
    transform: skewX(-4deg);
  }

  .page-news__subtitle {
    font-size: 13px;
    margin-bottom: 12px;
  }

  .page-news__filter {
    gap: 6px;
  }

  .page-news__filter-btn {
    font-size: 11px;
    padding: 4px 12px;
  }

  .page-news__timeline-wrap {
    padding-top: 16px;
    padding-bottom: 32px;
  }

  .page-news__timeline {
    flex-basis: 20px;
    padding-top: 20px;
  }

  .page-news__timeline-dot {
    width: 12px;
    height: 12px;
    border-width: 2px;
  }

  .page-news__articles {
    padding-left: 12px;
    gap: 24px;
  }

  .page-news__card {
    flex-direction: column;
    gap: 8px;
    padding: 14px 14px 12px 14px;
  }

  .page-news__card-index {
    font-size: 20px;
    width: auto;
    text-align: left;
    color: rgba(255, 255, 255, 0.12);
    margin-bottom: -4px;
  }

  .page-news__card-icon {
    margin-bottom: 4px;
  }

  .page-news__icon-img {
    width: 36px;
    height: 36px;
  }

  .page-news__card-title {
    font-size: 18px;
    transform: skewX(-3deg);
  }

  .page-news__card-content {
    font-size: 14px;
  }

  .page-news__card-toggle {
    font-size: 12px;
    margin-top: 8px;
  }

  .page-news__bottom-cta {
    padding-bottom: 24px;
  }

  .page-news__bottom-links .btn {
    min-width: 120px;
    font-size: 12px;
    padding: 8px 16px;
  }

  .page-news__bg-deco {
    display: none;
  }
}

/* =========================================
   桌面增强：宽屏 > 1024px
   ========================================= */
@media (min-width: 1024px) {
  .page-news__timeline-wrap {
    gap: 0;
  }

  .page-news__timeline {
    flex-basis: 48px;
  }

  .page-news__articles {
    padding-left: 40px;
    gap: 48px;
  }

  .page-news__card {
    padding: 28px 32px 24px 32px;
    gap: 20px;
  }

  .page-news__card-index {
    font-size: 36px;
    width: 48px;
    color: rgba(255, 255, 255, 0.06);
  }

  .page-news__card-title {
    font-size: 30px;
  }

  .page-news__card-content {
    font-size: 16px;
    line-height: 1.7;
  }

  .page-news__filter-btn {
    font-size: 14px;
    padding: 8px 24px;
  }

  .page-news__bg-deco {
    width: 240px;
    height: 180px;
    opacity: 0.08;
  }
}

/* =========================================
   筛选交互：纯 CSS 显示/隐藏
   ========================================= */
/* 默认全部显示 */
.page-news__card {
  display: flex;
}

/* 当某筛选激活时，隐藏不匹配卡片 */
.page-news__filter-btn.is-active[data-filter="schedule"] ~ .page-news__timeline-wrap .page-news__card:not([data-topic="schedule"]),
.page-news__filter-btn.is-active[data-filter="member"] ~ .page-news__timeline-wrap .page-news__card:not([data-topic="member"]),
.page-news__filter-btn.is-active[data-filter="round"] ~ .page-news__timeline-wrap .page-news__card:not([data-topic="round"]),
.page-news__filter-btn.is-active[data-filter="all"] ~ .page-news__timeline-wrap .page-news__card {
  /* 由于DOM结构限制，此方案需配合JS实现 */
  /* 此处保留样式，JS负责切换 .is-hidden 类 */
}

.page-news__card.is-hidden {
  display: none !important;
}

/* ---- 展开/收起 JS 辅助样式 ---- */
.page-news__card.is-open .page-news__toggle-text::before {
  content: "收起";
}

.page-news__card:not(.is-open) .page-news__toggle-text::before {
  content: "展开阅读";
}

.page-news__card.is-open .page-news__toggle-text {
  visibility: hidden;
  position: relative;
}

.page-news__card.is-open .page-news__toggle-text::after {
  content: "收起";
  visibility: visible;
  position: absolute;
  left: 0;
  top: 0;
}

.page-news__card:not(.is-open) .page-news__toggle-text {
  visibility: hidden;
  position: relative;
}

.page-news__card:not(.is-open) .page-news__toggle-text::after {
  content: "展开阅读";
  visibility: visible;
  position: absolute;
  left: 0;
  top: 0;
}

/* =========================================
   打印 & 减少动效
   ========================================= */
@media (prefers-reduced-motion: reduce) {
  .page-news__card,
  .page-news__card-content,
  .page-news__card-toggle,
  .page-news__filter-btn,
  .page-news__bottom-links .btn {
    transition: none !important;
    transform: none !important;
  }

  .page-news__card.is-open .page-news__card-content {
    max-height: none;
  }
}