/* ==========================================================
   page-news 专属样式
   作用域限定：.page-news
   移动端优先 + 桌面增强
   ========================================================== */
.page-news {
  --page-heading: 'Anton', 'Arial Black', 'Impact', sans-serif;
  --page-body: 'Roboto Slab', Georgia, 'Times New Roman', serif;
  --page-bg: var(--primary, #0B1D3A);
  --page-surface: var(--neutral-dark, #1A2A4A);
  --page-text: var(--neutral-light, #E0E6ED);
  --page-meta: var(--meta-color, #8899AA);
  --page-line: var(--line-divider, #2A3F66);
  --page-accent: var(--accent1, #FF6B35);
  --page-green: var(--accent2, #00C896);
  --page-highlight: var(--accent-high, #FFD166);
  --page-shadow: var(--shadow-heavy, 8px 8px 0 rgba(0,0,0,0.4));
  --page-shadow-sm: var(--shadow-light, 4px 4px 0 rgba(0,0,0,0.25));
  --page-border: var(--border-thick, 4px solid var(--line-divider));
  --page-radius: var(--radius-none, 0);
  --page-gap: var(--section-gap, 48px);
  --page-unit: var(--spacing-unit, 16px);
  --page-transition: var(--transition, cubic-bezier(0.25,0.46,0.45,0.94) 300ms);

  background-color: var(--page-bg);
  color: var(--page-text);
  font-family: var(--page-body);
  line-height: 1.6;
  padding: var(--page-unit);
  max-width: var(--content-max, 1200px);
  margin: 0 auto;
  position: relative;
}

/* ---- 顶部标题区 ---- */
.news-mast {
  display: flex;
  align-items: center;
  gap: calc(var(--page-unit) * 1.5);
  margin-bottom: var(--page-gap);
  border-bottom: var(--page-border);
  padding-bottom: calc(var(--page-unit) * 1.5);
}
.mast-icon {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border: var(--page-border);
  box-shadow: var(--page-shadow);
  flex-shrink: 0;
}
.mast-text {
  flex: 1;
}
.mast-heading {
  font-family: var(--page-heading);
  font-size: 2.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0 0 0.25rem;
  color: var(--page-accent);
  line-height: 1.1;
}
.mast-sub {
  font-size: 1.1rem;
  color: var(--page-meta);
  margin: 0;
}

/* ---- 筛选 + 文章布局 ---- */
.news-layout {
  display: flex;
  flex-direction: column;
  gap: var(--page-gap);
}

/* 左侧筛选栏 */
.filter-sidebar {
  flex-shrink: 0;
}
.filter-labels {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--page-unit) * 0.5);
}
.filter-label {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  font-family: var(--page-heading);
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border: 4px solid var(--page-line);
  color: var(--page-text);
  cursor: pointer;
  transition: var(--page-transition);
  user-select: none;
}
.filter-label:hover {
  border-color: var(--page-accent);
  color: var(--page-accent);
}

/* 纯CSS过滤：radio控制文章显示 */
#nf-all:checked ~ .news-layout .article-container article,
#nf-update:checked ~ .news-layout .article-container article[data-category="update"],
#nf-guide:checked ~ .news-layout .article-container article[data-category="guide"],
#nf-observe:checked ~ .news-layout .article-container article[data-category="observe"] {
  display: flex;
}
#nf-update:checked ~ .news-layout .article-container article:not([data-category="update"]),
#nf-guide:checked ~ .news-layout .article-container article:not([data-category="guide"]),
#nf-observe:checked ~ .news-layout .article-container article:not([data-category="observe"]) {
  display: none;
}

/* 分类区标题 —— 跟随过滤隐藏/显示 */
.section-label {
  grid-column: 1 / -1;
  font-family: var(--page-heading);
  font-size: 1.6rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--page-green);
  margin: var(--page-unit) 0 calc(var(--page-unit) * 0.5);
  padding-bottom: 0.25rem;
  border-bottom: 2px solid var(--page-line);
}
#nf-update:checked ~ .news-layout .article-container .section-label:not([data-category="update"]),
#nf-guide:checked ~ .news-layout .article-container .section-label:not([data-category="guide"]),
#nf-observe:checked ~ .news-layout .article-container .section-label:not([data-category="observe"]) {
  display: none;
}

/* ---- 文章卡片区 ---- */
.article-container {
  display: flex;
  flex-direction: column;
  gap: var(--page-gap);
}

/* ---- 文章卡片 ---- */
.article-card {
  display: flex;
  flex-direction: column;
  background-color: var(--page-surface);
  border: var(--page-border);
  box-shadow: var(--page-shadow-sm);
  transition: var(--page-transition);
  position: relative;
}
.article-card:hover {
  box-shadow: var(--page-shadow);
  transform: translateY(-4px);
}

.card-img {
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
  display: block;
  border-bottom: 2px solid var(--page-line);
}
.card-body {
  padding: calc(var(--page-unit) * 1.5);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  flex: 1;
}
.card-title {
  font-family: var(--page-heading);
  font-size: 1.5rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin: 0;
  color: var(--page-text);
  line-height: 1.2;
}
.card-summary {
  font-size: 1rem;
  color: var(--page-meta);
  margin: 0;
  line-height: 1.5;
}

/* 徽章 */
.badge {
  font-family: var(--page-heading);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.8rem;
  border: 2px solid;
  display: inline-block;
  width: fit-content;
}
.badge-accent {
  border-color: var(--page-accent);
  color: var(--page-accent);
}
.badge-green {
  border-color: var(--page-green);
  color: var(--page-green);
}
.badge-highlight {
  border-color: var(--page-highlight);
  color: var(--page-highlight);
}

/* 折叠面板 —— details/summary */
.card-details {
  margin-top: auto;
}
.details-btn {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  font-family: var(--page-heading);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border: 4px solid var(--page-accent);
  color: var(--page-accent);
  cursor: pointer;
  transition: var(--page-transition);
  list-style: none;
  user-select: none;
  background: transparent;
  width: fit-content;
}
.details-btn::-webkit-details-marker {
  display: none;
}
.details-btn:hover {
  background-color: var(--page-accent);
  color: var(--page-bg);
}
.card-details[open] .details-btn {
  background-color: var(--page-accent);
  color: var(--page-bg);
}
.details-content {
  padding-top: var(--page-unit);
  border-top: 2px solid var(--page-line);
  margin-top: var(--page-unit);
  font-size: 0.95rem;
  color: var(--page-text);
  line-height: 1.7;
}
.details-content a {
  color: var(--page-green);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--page-transition);
}
.details-content a:hover {
  color: var(--page-accent);
}
.insight-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  margin-top: var(--page-unit);
  border: var(--page-border);
  box-shadow: var(--page-shadow-sm);
}

/* 行业视角特殊卡片（带背景图） */
.card-observe {
  position: relative;
  overflow: hidden;
}
.card-bg-wrap {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.2;
}
.bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.card-observe .card-body {
  position: relative;
  z-index: 1;
  background-color: rgba(11, 29, 58, 0.85);
}

/* 页脚内链 */
.news-footnote {
  margin-top: var(--page-gap);
  padding-top: var(--page-unit);
  border-top: 2px solid var(--page-line);
  text-align: center;
}
.news-footnote a {
  color: var(--page-green);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: var(--page-transition);
}
.news-footnote a:hover {
  color: var(--page-accent);
}

/* ==========================================================
   桌面端增强 (min-width: 768px)
   ========================================================== */
@media (min-width: 768px) {
  .page-news {
    padding: calc(var(--page-unit) * 2) calc(var(--page-unit) * 3);
  }
  .news-mast {
    gap: calc(var(--page-unit) * 2.5);
    padding-bottom: calc(var(--page-unit) * 2);
  }
  .mast-icon {
    width: 140px;
    height: 140px;
  }
  .mast-heading {
    font-size: 4rem;
  }
  .mast-sub {
    font-size: 1.3rem;
  }

  /* 左右两栏布局 */
  .news-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--page-gap);
  }
  .filter-sidebar {
    width: 140px;
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--page-unit) * 2);
  }
  .filter-labels {
    flex-direction: column;
    gap: var(--page-unit);
  }
  .filter-label {
    width: 100%;
    text-align: center;
    padding: 0.6rem 0.8rem;
    font-size: 1rem;
  }

  /* 文章区网格 2列 */
  .article-container {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--page-gap);
  }
  .section-label {
    grid-column: 1 / -1;
    font-size: 1.8rem;
  }
  .card-img {
    max-height: 220px;
  }
  .card-title {
    font-size: 1.3rem;
  }

  /* 行业视角卡片跨列 */
  .card-observe {
    grid-column: 1 / -1;
  }
}

/* ==========================================================
   大桌面端 (min-width: 1024px)
   ========================================================== */
@media (min-width: 1024px) {
  .mast-heading {
    font-size: 5rem;
  }
  .filter-sidebar {
    width: 160px;
  }
  .article-container {
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--page-gap) * 1.2);
  }
  .card-title {
    font-size: 1.5rem;
  }
  .details-content {
    font-size: 1rem;
  }
}

/* ==========================================================
   窄屏微调 (max-width: 480px)
   ========================================================== */
@media (max-width: 480px) {
  .news-mast {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--page-unit);
  }
  .mast-icon {
    width: 80px;
    height: 80px;
  }
  .mast-heading {
    font-size: 2.2rem;
  }
  .filter-labels {
    gap: 0.4rem;
  }
  .filter-label {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
  }
  .card-body {
    padding: var(--page-unit);
  }
  .card-title {
    font-size: 1.2rem;
  }
}