:root{
  --brick: #8f2f2b; /* 砖红 */
  --sand: #efe6db;  /* 砂岩白 */
  --text:#222;
  --muted:#6b6b6b;
  --max-width:1200px; /* 在1120-1440之间 */
  --radius:2px;
  --border:1px solid rgba(0,0,0,0.06);
  --gap:28px;
}
/* 基础重置与版面 */
*{box-sizing:border-box}
html,body{height:100%;background:var(--sand);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial,"Noto Sans CJK SC",sans-serif;margin:0}
a{text-decoration:none;color:inherit}
.page-container{max-width:var(--max-width);margin:36px auto;padding:24px;}
.header-centered{background:transparent;padding:18px 0;text-align:center}
.header-inner{display:flex;flex-direction:column;align-items:center;gap:8px}
.header-title{font-weight:700;letter-spacing:0.02em;color:var(--brick);font-size:20px}
.header-nav{display:flex;gap:18px;font-size:13px;color:var(--muted)}
.header-line{height:1px;background:rgba(0,0,0,0.06);margin:6px auto;width:100%}
.mast-grid{display:flex;align-items:flex-start;justify-content:space-between;padding:18px 0;border-radius:var(--radius);border:var(--border);background:#fff;padding-left:20px;padding-right:20px}
.mast-left{font-weight:700;color:var(--text)}
.mast-right{min-width:180px;text-align:right}
.column-title{font-weight:600;color:var(--brick);margin-bottom:8px}
.column-list{list-style:none;padding:0;margin:0;color:var(--muted)}
.column-list li{padding:4px 0}
.layout-grid{display:grid;grid-template-columns:1fr 320px;gap:var(--gap);align-items:start;margin-top:28px}
.article{background:#fff;border:var(--border);border-radius:var(--radius);padding:28px}
.side-column{background:#fff;border:var(--border);border-radius:var(--radius);padding:20px}
.article-title{font-size:32px;line-height:1.08;text-align:center;margin:0 0 14px 0;font-weight:800;letter-spacing:-0.01em}
/* 标题居中，摘要左对齐 */
.summary{max-width:86%;text-align:left;color:var(--muted);margin:0 0 18px 0}
.article-meta{display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:13px;margin-bottom:12px}
.published:after{content:''}
.current{display:inline-block}
.content-area{font-size:17px;line-height:1.9;color:var(--text)}
.content{white-space:normal}
.ad-slot{background:transparent;margin:18px 0;padding:6px 0;text-align:center}
.ad-slot > *{display:inline-block}
/* 视觉签名：章节标题带短编号线但不自动生成编号 */
.section-title{position:relative;padding-top:12px;padding-bottom:10px;margin:24px 0 12px 0;font-size:18px;color:var(--text)}
.section-title::before{content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);width:36px;height:3px;background:var(--brick);border-radius:2px}
.faq{background:#fff;border:var(--border);border-radius:var(--radius);padding:18px;margin-top:8px}
.faq{border-top:4px solid var(--brick)}
.faq-body{color:var(--text)}
.related{margin-top:26px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.related-grid > *{background:#fff;border:var(--border);border-radius:var(--radius);padding:12px;font-size:14px}
.site-footer{max-width:var(--max-width);margin:28px auto;padding:8px 24px;color:var(--muted);font-size:13px}
/* 无阴影、微圆角、轻边框，遵守surface */
/* 可读性与排版（报刊式紧凑标题与舒展正文） */
.article-title{font-family:serif;}
.content-area{font-family:system-ui,-apple-system,Segoe UI,Roboto,"Noto Serif SC",serif}
/* 密度：舒展 */
.article, .side-column{padding:28px}
/* 响应：必须包含桌面与手机规则 */
@media (min-width:1024px){
  :root{--max-width:1240px}
  .page-container{padding:32px}
  /* 桌面学刊式布局：站名置左（mast-grid），栏目置右（mast-right），文章产生章节感与大留白 */
  .layout-grid{grid-template-columns:1fr 320px;gap:48px}
  .article-title{font-size:40px}
  .summary{max-width:70%}
  .related-grid{grid-template-columns:repeat(3,1fr)}
  .side-column{display:block}
}

@media (max-width:767px){
  :root{--max-width:640px}
  body{font-size:15px}
  .mast-grid{flex-direction:column;gap:10px;padding:12px}
  .mast-right{text-align:left}
  .page-container{padding:16px}
  /* 手机端两套排版：章节间距缩小但保持层级；底部区域改为单列 */
  .layout-grid{grid-template-columns:1fr;gap:14px}
  .article{padding:16px}
  .article-title{font-size:22px}
  .summary{max-width:100%;margin-bottom:10px}
  .content-area{font-size:16px;line-height:1.7}
  .side-column{display:none}
  .related-grid{grid-template-columns:1fr}
  .ad-slot{margin:12px 0}
  /* 保证在320px无横向滚动 */
  html,body{overflow-x:hidden}
}

/* 无占位死链：导航使用文本节点而非空 href */