/* ===== 品牌日志 page-news ===== */
.page-news {
  --news-accent: var(--color-brand-accent, #D32F2F);
  --news-gold: var(--color-accent-secondary, #FFC107);
  --news-bg: var(--color-primary-bg, #0A0A0A);
  --news-surface: var(--color-surface-dark, #121212);
  --news-text: var(--color-primary-fg, #FFFFFF);
  --news-muted: var(--color-neutral-gray, #B0B0B0);
  --news-border: var(--color-border-subtle, #2C2C2C);
  --news-article-bg: #141414;
  --news-index-width: 260px;

  display: block;
  background: var(--news-bg);
  color: var(--news-text);
  font-family: var(--font-body, 'Inter', sans-serif);
  padding: 0 0 var(--space-2xl, 4rem);
}

/* ---- 页面标题区 ---- */
.page-news .news-header {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: var(--space-xl, 3rem) var(--space-md, 1rem) var(--space-lg, 2rem);
  position: relative;
}

.page-news .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 0.5rem);
  font-size: var(--size-small, 0.875rem);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  color: var(--news-muted);
  margin-bottom: var(--space-md, 1rem);
}

.page-news .breadcrumb-link {
  color: var(--news-muted);
  text-decoration: none;
  transition: color var(--transition-fast, 150ms ease);
}

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

.page-news .breadcrumb-sep {
  color: var(--news-border);
}

.page-news .breadcrumb-current {
  color: var(--news-text);
  font-weight: 600;
}

.page-news .news-header-inner {
  position: relative;
  padding-left: var(--space-lg, 2rem);
  border-left: 4px solid var(--news-accent);
}

.page-news .news-headline {
  font-family: var(--font-heading, 'Roboto Condensed', sans-serif);
  font-size: var(--size-h1, 3.5rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin: 0 0 var(--space-sm, 0.5rem);
  color: var(--news-text);
  line-height: 1.1;
}

.page-news .news-subhead {
  font-size: var(--size-body, 1rem);
  color: var(--news-muted);
  max-width: 640px;
  margin: 0 0 var(--space-md, 1rem);
  line-height: 1.6;
}

.page-news .headline-bar {
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--news-accent), var(--news-gold));
  margin-top: var(--space-sm, 0.5rem);
}

/* ---- 主容器（radio + 索引 + 内容） ---- */
.page-news .news-container {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 0 var(--space-md, 1rem);
  display: flex;
  align-items: flex-start;
  gap: var(--space-xl, 3rem);
  position: relative;
}

/* 隐藏 radio */
.page-news .hidden-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
  opacity: 0;
  pointer-events: none;
}

/* ---- 左侧索引 ---- */
.page-news .news-index {
  flex: 0 0 var(--news-index-width);
  position: sticky;
  top: calc(var(--header-total, 6rem) + var(--space-md, 1rem));
  max-height: calc(100vh - var(--header-total, 6rem) - var(--space-2xl, 4rem));
  overflow-y: auto;
  padding: var(--space-sm, 0.5rem) 0;
  border-right: 1px solid var(--news-border);
}

.page-news .index-item {
  position: relative;
  margin-bottom: var(--space-xs, 0.25rem);
}

.page-news .index-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm, 0.5rem);
  padding: var(--space-sm, 0.5rem) var(--space-md, 1rem);
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background var(--transition-fast, 150ms ease),
              border-color var(--transition-fast, 150ms ease);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: var(--size-small, 0.875rem);
  color: var(--news-muted);
  user-select: none;
  border-radius: 0 4px 4px 0;
}

.page-news .index-label:hover {
  background: rgba(211,47,47,0.08);
  color: var(--news-text);
}

.page-news .index-label:focus-visible {
  outline: 2px solid var(--news-accent);
  outline-offset: 2px;
}

.page-news .index-num {
  font-weight: 700;
  color: var(--news-accent);
  min-width: 2em;
  font-size: var(--size-small, 0.875rem);
}

.page-news .index-title {
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* 悬停预览 */
.page-news .index-preview {
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--news-surface);
  border: 1px solid var(--news-border);
  border-left: 3px solid var(--news-accent);
  padding: var(--space-sm, 0.5rem) var(--space-md, 1rem);
  font-size: var(--size-small, 0.875rem);
  color: var(--news-muted);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast, 150ms ease);
  z-index: 20;
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.page-news .index-item:hover .index-preview {
  opacity: 1;
}

/* ---- 当前选中高亮 ---- */
#art-1:checked ~ .news-index .index-item:nth-child(1) .index-label,
#art-2:checked ~ .news-index .index-item:nth-child(2) .index-label,
#art-3:checked ~ .news-index .index-item:nth-child(3) .index-label,
#art-4:checked ~ .news-index .index-item:nth-child(4) .index-label {
  border-left-color: var(--news-gold);
  background: rgba(255,193,7,0.06);
  color: var(--news-text);
}

#art-1:checked ~ .news-index .index-item:nth-child(1) .index-num,
#art-2:checked ~ .news-index .index-item:nth-child(2) .index-num,
#art-3:checked ~ .news-index .index-item:nth-child(3) .index-num,
#art-4:checked ~ .news-index .index-item:nth-child(4) .index-num {
  color: var(--news-gold);
}

/* ---- 右侧内容区 ---- */
.page-news .news-display {
  flex: 1;
  min-width: 0;
  position: relative;
}

/* 所有文章默认隐藏 */
.page-news .article {
  display: none;
  animation: news-fade-in 0.35s ease;
}

@keyframes news-fade-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 选中时显示对应文章 */
#art-1:checked ~ .news-display .article-1,
#art-2:checked ~ .news-display .article-2,
#art-3:checked ~ .news-display .article-3,
#art-4:checked ~ .news-display .article-4 {
  display: block;
}

.page-news .article {
  background: var(--news-article-bg);
  border: 1px solid var(--news-border);
  border-radius: 8px;
  padding: var(--space-lg, 2rem);
  position: relative;
  box-shadow: 0 2px 24px rgba(0,0,0,0.3);
}

/* 内容区域轻微纹理 */
.page-news .article::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 20px,
      rgba(255,255,255,0.008) 20px,
      rgba(255,255,255,0.008) 21px
    );
  pointer-events: none;
  border-radius: 8px;
  z-index: 0;
}

.page-news .article > * {
  position: relative;
  z-index: 1;
}

/* 文章图片 */
.page-news .article-img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
  margin-bottom: var(--space-lg, 2rem);
  border: 1px solid var(--news-border);
  background: var(--news-surface);
}

/* 文章标题 */
.page-news .article-title {
  font-family: var(--font-heading, 'Roboto Condensed', sans-serif);
  font-size: var(--size-h3, 2rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space-md, 1rem);
  display: flex;
  align-items: baseline;
  gap: var(--space-sm, 0.5rem);
  color: var(--news-text);
}

.page-news .article-num {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: calc(var(--size-h3, 2rem) * 0.75);
  color: var(--news-accent);
  font-weight: 900;
  flex-shrink: 0;
  line-height: 1;
}

/* 文章正文 */
.page-news .article-body {
  font-size: var(--size-body, 1rem);
  line-height: 1.75;
  color: var(--news-muted);
}

.page-news .article-body p {
  margin: 0 0 var(--space-md, 1rem);
}

.page-news .article-body p:last-child {
  margin-bottom: 0;
}

.page-news .article-link {
  color: var(--news-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  transition: color var(--transition-fast, 150ms ease);
}

.page-news .article-link:hover,
.page-news .article-link:focus-visible {
  color: var(--news-gold);
  text-decoration-color: var(--news-gold);
}

/* 极细红线分隔 */
.page-news .article-body p + p {
  border-top: 1px solid rgba(211,47,47,0.15);
  padding-top: var(--space-md, 1rem);
}

/* ---- 响应式：移动端 ---- */
@media (max-width: 767px) {
  .page-news .news-header {
    padding: var(--space-lg, 2rem) var(--space-md, 1rem) var(--space-md, 1rem);
  }

  .page-news .news-headline {
    font-size: calc(var(--size-h1, 3.5rem) * 0.65);
  }

  .page-news .news-header-inner {
    padding-left: var(--space-md, 1rem);
  }

  .page-news .news-container {
    flex-direction: column;
    gap: var(--space-md, 1rem);
    padding: 0 var(--space-sm, 0.5rem);
  }

  .page-news .news-index {
    flex: none;
    width: 100%;
    position: static;
    max-height: none;
    overflow-y: visible;
    display: flex;
    flex-wrap: nowrap;
    gap: var(--space-xs, 0.25rem);
    padding: var(--space-sm, 0.5rem) 0;
    border-right: none;
    border-bottom: 1px solid var(--news-border);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
  }

  .page-news .index-item {
    flex: 0 0 auto;
    margin-bottom: 0;
    scroll-snap-align: start;
  }

  .page-news .index-label {
    padding: var(--space-xs, 0.25rem) var(--space-sm, 0.5rem);
    border-left: none;
    border-bottom: 2px solid transparent;
    border-radius: 0;
    white-space: nowrap;
    font-size: var(--size-small, 0.875rem);
  }

  .page-news .index-label:hover {
    background: rgba(211,47,47,0.06);
  }

  #art-1:checked ~ .news-index .index-item:nth-child(1) .index-label,
  #art-2:checked ~ .news-index .index-item:nth-child(2) .index-label,
  #art-3:checked ~ .news-index .index-item:nth-child(3) .index-label,
  #art-4:checked ~ .news-index .index-item:nth-child(4) .index-label {
    border-left-color: transparent;
    border-bottom-color: var(--news-gold);
  }

  .page-news .index-preview {
    display: none;
  }

  .page-news .news-display {
    width: 100%;
  }

  .page-news .article {
    padding: var(--space-md, 1rem);
    border-radius: 6px;
  }

  .page-news .article-title {
    font-size: var(--size-h4, 1.5rem);
    flex-wrap: wrap;
  }

  .page-news .article-num {
    font-size: calc(var(--size-h4, 1.5rem) * 0.75);
  }

  .page-news .article-img {
    margin-bottom: var(--space-md, 1rem);
  }
}

/* ---- 桌面增强 ---- */
@media (min-width: 768px) {
  .page-news .news-index {
    scrollbar-width: thin;
    scrollbar-color: var(--news-border) transparent;
  }

  .page-news .news-index::-webkit-scrollbar {
    width: 4px;
  }

  .page-news .news-index::-webkit-scrollbar-track {
    background: transparent;
  }

  .page-news .news-index::-webkit-scrollbar-thumb {
    background: var(--news-border);
    border-radius: 4px;
  }

  .page-news .article-img {
    max-height: 320px;
    width: 100%;
  }

  .page-news .article-2 .article-img {
    max-height: 360px;
  }

  .page-news .article-4 .article-img {
    max-height: 400px;
    object-position: center;
  }
}

/* ---- 宽屏微调 ---- */
@media (min-width: 1200px) {
  .page-news .news-header {
    padding-left: calc((100vw - var(--max-width, 1280px)) / 2 + var(--space-md, 1rem));
    padding-right: calc((100vw - var(--max-width, 1280px)) / 2 + var(--space-md, 1rem));
  }

  .page-news .news-container {
    padding-left: calc((100vw - var(--max-width, 1280px)) / 2 + var(--space-md, 1rem));
    padding-right: calc((100vw - var(--max-width, 1280px)) / 2 + var(--space-md, 1rem));
  }

  .page-news .article-img {
    max-height: 400px;
  }
}