:root{
  --bg:#ffffff;
  --header-bg:#2b2b2b; /* 石墨灰 */
  --accent:#c9a300; /* 芥末黄 */
  --text:#111111;
  --muted:#666666;
  --max-width:1280px; /* 桌面容器目标值，处于1120-1440区间 */
  --gap:20px;
  --radius:4px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans CJK SC", "Microsoft Yahei", sans-serif;
}

/* Reset-ish */
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--bg);color:var(--text);}
a{color:inherit;text-decoration:none}

.site-header{background:var(--header-bg);color:#fff;padding:14px 20px 10px;border-bottom:4px solid var(--accent);}
.header-inner{max-width:var(--max-width);margin:0 auto;display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap}
.site-brand{font-weight:700;letter-spacing:0.2px;color:#fff}
.top-nav{font-size:13px;color:rgba(255,255,255,0.85)}
.header-rule{border:0;height:1px;background:rgba(255,255,255,0.06);margin:12px 0 0}

.container{max-width:var(--max-width);margin:26px auto;padding:0 20px}
.article{display:block}

/* Meta / Title composition */
.meta-top{background:#fff;padding:14px;border-left:3px solid var(--accent);}
.kicker{margin:0;font-size:13px;color:var(--accent);font-weight:600;letter-spacing:0.6px}
h1{margin:8px 0 6px;font-size:28px;line-height:1.18;font-weight:700}
.meta-row{display:flex;gap:12px;font-size:13px;color:var(--muted);margin-bottom:8px}
.summary{background:#fff;padding:10px 12px;border:1px solid rgba(0,0,0,0.04);font-size:15px;color:var(--muted)}

/* Editorial grid - default to mobile single column; desktop will switch */
.editorial-grid{display:block;margin-top:18px}
.main-col{background:var(--bg)}
.side-col{margin-top:12px}
.info-block{background:#fff;border:1px solid rgba(0,0,0,0.06);padding:12px;text-align:center;font-weight:600;color:var(--muted)}

.article-body{font-size:16px;line-height:1.75;color:var(--text);word-break:break-word}
.article-body p{margin:0 0 12px}

/* Ads containers: independent, non-floating */
.ad{margin:18px 0;padding:10px;border:1px dashed rgba(0,0,0,0.06);background:#fff}
.ad-top{margin-top:10px}

/* FAQ details */
.faq-area details{background:#fff;border:1px solid rgba(0,0,0,0.06);padding:8px}
.faq-area summary{cursor:pointer;font-weight:600;padding:6px}
.faq-list{padding:8px 6px;color:var(--muted)}

/* Bottom area: related + ad_bottom arranged per blueprint */
.bottom-area{display:flex;gap:16px;align-items:flex-start;margin-top:18px}
.related-area{flex:1}
.related-title{font-size:16px;margin:0 0 8px}
.related-list{padding-left:20px;color:var(--muted)}
.related-list li{margin:6px 0}

/* Footer visual signature: wide-screen index style */
.site-footer{border-top:1px solid rgba(0,0,0,0.06);padding:22px 20px;background:transparent}
.footer-index{max-width:var(--max-width);margin:0 auto;display:flex;gap:20px;align-items:flex-start}
.footer-index .col{flex:1;background:transparent;padding:6px}
.brand{font-weight:700}
.copyright{color:var(--muted);font-size:13px}
.index-title,.guide-title{font-weight:600;color:var(--muted)}

/* Density: 紧凑 */
.kicker,h1,.summary,.article-body{margin-bottom:8px}

/* Typography adjustments */
@media (min-width:1024px){
  /* Desktop rules - editorial stack with 12-col split: main 10 / side 2 */
  .container{min-width:1120px;max-width:1280px;padding:0 24px}
  .meta-top{padding:16px 18px}
  h1{font-size:34px}
  .editorial-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:24px;align-items:start;margin-top:20px}
  .main-col{grid-column: 1 / span 10}
  .side-col{grid-column: 11 / span 2;margin-top:0}

  /* Cross-column title & summary band already placed above grid (跨栏标题、摘要带)
     The meta-top sits across the full width by being above editorial-grid. */

  /* Bottom area with different-width错位排列: FAQ/related and ad_bottom arranged as staggered widths */
  .bottom-area{display:grid;grid-template-columns:2fr 1fr;gap:28px;align-items:start}
  .related-area{grid-column:2 / span 1;order:2}
  .ad-bottom{grid-column:1 / span 1;order:1}

  /* Footer wide-screen index layout more pronounced */
  .footer-index{display:grid;grid-template-columns:200px 1fr 1fr;align-items:start}
}

@media (max-width:767px){
  /* Mobile rules: single column, semantic order, no offsets */
  .container{padding:0 14px;margin:16px auto}
  h1{font-size:20px}
  .meta-row{flex-direction:column;gap:6px}
  .summary{font-size:14px}
  .editorial-grid{display:block}
  .main-col{order:1}
  .side-col{order:2;margin-top:12px}
  .side-col .info-block{width:100%}
  .bottom-area{display:block}
  .related-list{padding-left:18px}
  .footer-index{display:block}
  .site-header{padding:12px 14px}
  .header-inner{justify-content:space-between}
  /* Guard against horizontal scroll at 320px */
  html,body{overflow-x:hidden}
}

/* Accessibility & small details */
.kicker{display:block}
.related-list li{line-height:1.5}