:root{
  --brick:#b33a2f; /* 砖红 */
  --sand:#f6efe6;  /* 砂岩白 */
  --text:#222;
  --muted:#666;
  --accent:var(--brick);
  --max-width-clamp:clamp(1120px,78vw,1440px);
  --gutter:28px;
  --title-font: Georgia, 'Times New Roman', Times, serif;
  --body-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
}

/* Base reset and layout */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:var(--sand);
  color:var(--text);
  font-family:var(--body-font);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

.site-header{
  background:transparent;
  padding:18px 0;
  border-bottom:0;
}
.header-inner{
  width:var(--max-width-clamp);
  margin:0 auto;
  display:flex;
  align-items:baseline; /* 与正文基线不同，形成视觉识别 */
  justify-content:flex-start;
  gap:12px;
}
.site-home{
  text-decoration:none;
  color:var(--brick);
  font-weight:600;
  font-size:18px;
}

.page-wrap{display:flex;flex-direction:column;min-height:100vh}
.container{
  width:var(--max-width-clamp);
  margin:28px auto;
  padding:0 calc(var(--gutter));
}

.ad-slot{width:100%;max-width:var(--max-width-clamp);margin:12px auto;color:var(--muted);font-size:13px}
.ad-top,.ad-middle,.ad-bottom{background:transparent}

/* Split headline */
.split-head{display:grid;gap:18px;align-items:start;margin-bottom:18px}
.split-left .summary{margin:0;color:var(--muted);text-align:left}
.split-right{text-align:center}
.title{font-family:var(--title-font);font-size:28px;margin:0;color:var(--text);line-height:1.15}
.meta-row{margin-top:10px;font-size:13px;color:var(--muted);display:flex;gap:14px;justify-content:center}
.published{font-variant-numeric:tabular-nums}
.current{color:var(--muted)}

/* Article */
.article{background:transparent;padding:6px 0;margin-bottom:18px}
.article-body{font-size:16px;color:var(--text);font-family:var(--body-font)}
.article-body p{margin:0 0 1em}
.article-body h2,h3{border-top:1px solid rgba(0,0,0,0.06);padding-top:18px;margin-top:16px}

/* post-grid: desktop 7/5 columns */
.post-grid{display:block;margin-top:18px}
.post-main{min-height:40px}
.post-side{margin-top:20px}
.side-title{font-size:16px;margin:0 0 10px;color:var(--brick);font-family:var(--body-font);font-weight:600}
.faq{font-size:14px;color:var(--text)}
.faq ol{padding-left:1.2em;margin:0}
.faq li{margin:0 0 .9em}
.related{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.related a{color:var(--text);text-decoration:none;font-size:14px}

.site-footer{margin-top:auto;padding:18px 0;color:var(--muted);font-size:13px}
.footer-inner{width:var(--max-width-clamp);margin:0 auto;padding:0 18px}

/* Desktop rules */
@media (min-width:1024px){
  .container{padding:0 36px}
  .split-head{grid-template-columns:1fr 1fr;align-items:start}
  .split-left{display:flex;align-items:flex-start}
  .split-right{display:flex;flex-direction:column;align-items:center}
  .title{font-size:34px}
  .meta-row{justify-content:center}

  /* post-grid becomes 7/5 two-column */
  .post-grid{display:grid;grid-template-columns:7fr 5fr;gap:28px;align-items:start}
  .post-main{padding-right:12px}
  .post-side{padding-left:12px}

  /* related pattern: 4-column tight grid inside side on larger widths */
  .related{grid-template-columns:repeat(4,1fr);gap:10px}
  .related a{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
}

/* Mobile rules */
@media (max-width:767px){
  :root{--gutter:18px}
  .header-inner{padding:0 12px}
  .container{margin:16px auto;padding:0 12px}
  .split-head{grid-template-columns:1fr;gap:8px}
  .split-left .summary{text-align:left;font-size:14px}
  .split-right{text-align:left}
  .title{text-align:center;font-size:22px;margin-top:2px}
  .meta-row{justify-content:flex-start;gap:10px;font-size:12px}

  /* Stack FAQ and related after content in natural order */
  .post-grid{display:block}
  .post-side{margin-top:12px}
  .related{grid-template-columns:repeat(2,1fr)}
}

/* Accessibility and readable density */
a{color:var(--accent)}
h1,h2{line-height:1.2}

/* Avoid decorative capsules or heavy shadows per forbidden patterns */

/* Ensure no horizontal overflow at small widths */
img,table,pre,code{max-width:100%;overflow:auto}