/* Palette & variables */
:root{
  --brick:#8B2F2B; /* 砖红 */
  --sand:#F5EFE6;  /* 砂岩白 */
  --text:#222;
  --muted:#6b6b6b;
  --max-width:1280px;
  --gap:24px;
  --radius:0px; /* 方形信息块 */
  --vline-color:var(--brick);
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--sand);}
.page-frame{max-width:var(--max-width);margin:20px auto;border-left:1px solid var(--brick);border-right:1px solid var(--brick);background:transparent;position:relative;padding:0 18px;}
/* Header: 深色报头 */
.site-header{background:var(--brick);color:var(--sand);padding:18px 0 0 0}
.header-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;max-width:var(--max-width);margin:0 auto;padding:0 6px}
.editorial-left{display:flex;flex-direction:column}
.site-logo{color:var(--sand);text-decoration:none;font-weight:700;font-size:20px}
.masthead-meta{color:rgba(245,239,230,0.85);font-size:13px;margin-top:6px}
.editorial-right{display:flex;gap:14px;align-items:center}
.editorial-right .nav-item{color:rgba(245,239,230,0.9);font-size:13px}
.header-narrow{height:28px;background:rgba(0,0,0,0.06);margin-top:12px}

/* Title composition: 左右分置 */
.title-block{display:grid;grid-template-columns:1fr 360px;gap:24px;align-items:start;padding:22px 6px;border-top:1px solid rgba(0,0,0,0.05);border-bottom:1px solid rgba(0,0,0,0.05);background:#fff}
.page-title{font-size:28px;line-height:1.18;margin:0;color:var(--text);font-weight:700}
.title-right .summary{margin:0;color:var(--muted);font-size:15px}
.published{display:block;margin-top:10px;color:var(--muted);font-size:13px}
.meta-small{margin-top:12px;font-size:13px;color:var(--muted)}

/* Grid: 12 columns -> main 8 / aside 4 */
.content-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:var(--gap);padding:24px;background:#fff}
.article{grid-column:1 / span 8}
.sidebar{grid-column:9 / span 4;display:flex;flex-direction:column;gap:14px}

.article-head{border-bottom:1px solid rgba(0,0,0,0.06);padding-bottom:12px;margin-bottom:12px}
.article-body{color:var(--text);line-height:1.8;font-size:17px}
.article-body p{margin:0 0 16px}

.section-title{font-size:16px;margin:18px 0 8px;border-top:1px solid rgba(0,0,0,0.06);padding-top:12px}
.faq-list,.related-list{font-size:15px;color:var(--text)}
.faq-list > *{margin:8px 0}
.related-list > *{padding:10px 0;border-bottom:1px solid rgba(0,0,0,0.06);display:flex;justify-content:space-between}

/* Side blocks: 方形信息块 */
.side-block{background:#fff;padding:12px;border:1px solid rgba(0,0,0,0.06);border-radius:var(--radius)}
.side-title{font-size:14px;margin:0 0 8px}
.side-desc{color:var(--muted);font-size:14px}
.index-list{list-style:none;padding:0;margin:0}
.index-list li{padding:6px 0;border-top:1px solid rgba(0,0,0,0.03)}

/* Ads: 独立容器，不遮挡、不悬浮 */
.ad{background:transparent;color:var(--muted);font-size:14px;padding:10px;border:1px dashed rgba(0,0,0,0.06)}
.ad-top{min-height:60px}
.ad-middle{margin:18px 0}
.ad-bottom{min-height:60px}

/* Footer */
.site-footer{padding:18px 6px;color:var(--muted);font-size:13px;background:transparent}

/* Visual signature: 1px 竖线贯穿页面 */
.vline{position:absolute;left:calc(50% + 240px);top:0;bottom:0;width:1px;background:var(--vline-color);opacity:0.12;pointer-events:none}

/* Typography density 舒展 */
.page-title{letter-spacing:0.2px}
.article-body h2,.article-body h3{margin-top:20px}

/* Responsive: Desktop rules (@media min-width:1024px) */
@media (min-width:1024px){
  body{background:var(--sand)}
  .page-frame{margin:28px auto;padding:0 24px}
  .title-block{grid-template-columns:1fr 420px}
  .page-title{font-size:34px}
  .article-body{font-size:18px}
  /* ensure desktop layout difference: non-symmetric grid/边注效果: move sidebar slightly up visually */
  .sidebar{padding-top:6px}
  .vline{left:calc(100% - 220px);opacity:0.12}
}

/* Mobile rules (@media max-width:767px) */
@media (max-width:767px){
  .page-frame{border-left:none;border-right:none;margin:0;padding:0}
  .site-header{padding:12px}
  .header-narrow{display:none}
  .title-block{grid-template-columns:1fr;gap:10px;padding:12px}
  .title-right{order:2}
  .title-left{order:1}
  .page-title{font-size:20px}
  .published{font-size:12px}
  .content-grid{grid-template-columns:1fr;padding:12px;gap:12px}
  .article{grid-column:1/span 1}
  .sidebar{grid-column:1/span 1;order:2}
  .vline{display:none}
  .ad{font-size:13px}
  .article-body{font-size:16px;padding-bottom:6px}
  /* 侧栏下移：已经单列化，保持自然阅读顺序 */
}

/* Accessibility tweaks */
a{color:var(--brick)}