:root{
  --bg:#ffffff;
  --ink:#141414; /* 炭黑 */
  --muted:#8f857a; /* 暖灰 */
  --accent:#3a3a3a;
  --gap:24px;
  --max-desktop:1280px;
  --min-desktop:1120px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color-scheme: light;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--bg);color:var(--ink);}
.site-header{background:#111; color:#fff; padding:12px 20px 18px;border-bottom:1px solid rgba(255,255,255,0.06);}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;max-width:1440px;margin:0 auto}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;letter-spacing:0.06em}
.brand .home-link{color:#fff;text-decoration:none}
.brand .year{color:var(--muted);font-weight:500}
.header-ad{color:var(--muted);font-size:13px}
.masthead{display:flex;justify-content:space-between;align-items:flex-end;padding-top:12px;max-width:1440px;margin:6px auto 0}
.mast-sub{color:#dcd6d1;font-size:13px}
.mast-right{color:#cfc7c0;font-size:13px}

/* Container and core layout */
.site-main{padding:28px 20px 48px}
.container{margin:0 auto; padding:0 20px;}
/* Desktop width clamped between min and max where viewport allows */
@media (min-width:1024px){
  .container{max-width:calc(min(var(--max-desktop), 92vw)); /* prefer up to 1280px but responsive */
             padding:0;}
}

/* Two-column asymmetric grid for desktop: related left (narrow), article right (wide) */
.layout{display:block}
@media (min-width:1024px){
  .layout{display:grid;grid-template-columns:360px 1fr;gap:48px;align-items:start;min-width:var(--min-desktop);max-width:var(--max-desktop);margin:0 auto}
  /* create diagonal balance: push article content visually lower than related */
  .article{margin-top:44px}
  .related{align-self:start}
}

/* Related (left) surface: 方形信息块，方正边角 */
.related-box{background:#fff;border:1px solid rgba(20,20,20,0.06);padding:18px}
.related-title{margin:0 0 12px 0;font-size:15px;color:var(--accent);font-weight:700}
.related-list{font-size:14px;color:var(--muted);line-height:1.7}
/* related_pattern: 关键词索引式列表 - simple list styling; runtime provides links */
.related-list a{color:var(--ink);text-decoration:none}

/* Article area */
.article{background:transparent}
.article-header{background:#fff;padding:20px;border-bottom:1px solid rgba(20,20,20,0.04)}
.title-row{display:flex;gap:18px;align-items:flex-start}
.title-row h1{flex:1;margin:0;font-size:28px;line-height:1.15;color:var(--ink);font-weight:800;letter-spacing:-0.01em}
/* meta narrow column */
.meta-column{width:160px;flex:0 0 160px;text-align:right;font-size:13px;color:var(--muted)}
.meta-column .published{display:block;margin-bottom:6px}
.meta-column .now{display:block}

/* Visual signature: header left baseline, body justified (不同对齐基线) */
.site-header, .masthead, .brand{text-align:left}
.content, .summary, .faq, .related-list{text-align:justify}
.summary{padding:18px 20px;background:#fff;border-bottom:1px solid rgba(20,20,20,0.03);margin-bottom:18px}
.summary p{margin:8px 0 0;color:var(--muted);line-height:1.7}

.content{padding:8px 20px 20px;background:#fff;color:var(--ink);line-height:1.85;font-size:16px}
.content p{margin:0 0 1em}

/* mid ad container - separate block, never inside paragraphs */
.mid-ad{padding:18px;background:#fff;border-top:1px solid rgba(20,20,20,0.03);margin-top:18px}

/* FAQ pattern: two-column on desktop, single column on mobile */
.faq{padding:18px;background:#fff;margin-top:18px;border-top:1px solid rgba(20,20,20,0.03)}
.faq h2{margin:0 0 12px 0;font-size:16px;color:var(--accent)}
.faq-grid{display:grid;grid-template-columns:1fr;gap:12px}
.faq-grid > *{padding:12px;border:1px solid rgba(20,20,20,0.04);background:transparent}
@media (min-width:1024px){
  .faq-grid{grid-template-columns:1fr 1fr}
}

/* Footer */
.site-footer{border-top:1px solid rgba(20,20,20,0.04);padding:18px 20px;background:transparent}
.footer-inner{max-width:var(--max-desktop);margin:0 auto;display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:13px}

/* Mobile rules - independent reflow, cancel diagonal offset, linear order as required */
@media (max-width:767px){
  .layout{display:block}
  .related{order:5}
  .article{order:1;margin-top:0}
  .title-row{flex-direction:column}
  .meta-column{text-align:left;width:auto;margin-top:8px}
  .title-row h1{font-size:20px}
  .summary{order:2}
  .content{order:3}
  .mid-ad{order:4}
  .faq{order:5}
  .related{order:6}

  /* ensure no horizontal scroll at 320px */
  .container{padding:0 14px}
  .article-header,.summary,.content,.mid-ad,.faq,.related-box{padding:14px}
  .related-list{word-break:break-word}
}

/* Accessibility and density */
h1,h2{line-height:1.2}
p,li{line-height:1.8}
a{color:inherit}

/* Avoid banned visual patterns: no heavy rounded corners, no gradients, no large shadows */
*{border-radius:2px}