:root{
  --bg: #f7efe4; /* 奶油白 */
  --ink: #2b1b12; /* 深棕 */
  --muted: #6b5a4a;
  --max-wide: 1280px;
  --content-width: 860px;
  --gap: 28px;
  --hr-color: rgba(43,27,18,0.08);
  --page-padding: 20px;
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","PingFang SC","Hiragino Sans GB","Microsoft Yahei",sans-serif;
  color: var(--ink);
  background: var(--bg);
}

/* Base layout */
*{box-sizing:border-box}
body{margin:0;line-height:1.65;font-size:16px;color:var(--ink);background:var(--bg);}
.page-wrap{max-width:var(--max-wide);margin:0 auto;padding:18px var(--page-padding);}
.section-sep{border:0;height:1px;background:var(--hr-color);margin:12px 0}
.header-row{display:flex;align-items:center;gap:12px}
.brand a{color:var(--ink);text-decoration:none;font-weight:700;font-size:18px;letter-spacing:0.2px}
.header-spacer{flex:1}

/* Title band vs content band: different alignment baselines = visual_signature */
.title-area{display:block;text-align:center;padding:28px 0 6px}
.title-area h1{margin:0;font-size:28px;line-height:1.08;font-weight:800;letter-spacing: -0.5px}

.meta-area{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--muted);padding:6px 0}
.summary{max-width:var(--content-width);margin:14px 0 18px;padding:0;color:var(--muted);text-align:left}

/* Content area: narrower column centered for desktop */
.content-area{max-width:var(--content-width);margin:0 auto;padding-bottom:18px}
.content-area p{margin:0 0 14px}
.content-area h2{margin:28px 0 12px;font-size:20px}
.content-area ul, .content-area ol{margin:0 0 14px 18px}
.content-area blockquote{margin:12px 0;padding-left:12px;border-left:3px solid rgba(43,27,18,0.06);color:var(--muted)}

/* Ad slots are independent, non-floating */
.ad-slot{max-width:var(--content-width);margin:18px auto;padding:12px;background:transparent;color:var(--muted);text-align:center;border-radius:2px}
.ad-slot *{pointer-events:none}

/* FAQ pattern: details list without card */
.faq-section .section-title,.related-section .section-title{font-size:16px;margin:8px 0 12px;color:var(--ink);font-weight:700}
.faq-list details{margin:8px 0;padding:8px 0;border-bottom:1px solid var(--hr-color)}
.faq-list summary{cursor:pointer;outline:none;font-weight:600}
.faq-list p{margin:8px 0 0;color:var(--muted)}

/* Related: separated-line list with date, three-column on desktop */
.related-list{display:grid;gap:10px}
.related-list a{display:block;padding:10px 0;color:var(--ink);text-decoration:none;border-bottom:1px solid var(--hr-color)}
.related-list time{display:block;color:var(--muted);font-size:13px;margin-top:6px}

/* Footer */
.site-footer{padding:12px var(--page-padding);font-size:13px;color:var(--muted)}
.footer-row{display:flex;justify-content:space-between}

/* Desktop rules - distinct layout behavior for >=1024px */
@media (min-width:1024px){
  :root{--page-padding:32px;--gap:36px}
  body{font-size:17px}
  .page-wrap{padding:28px var(--page-padding)}

  /* Ensure container sits between 1120 and 1440 when space allows */
  .page-wrap{max-width: min(max(1120px, 88vw), 1440px)}

  .title-area{padding:36px 0 8px}
  .title-area h1{font-size:34px}
  .summary{margin-left:0}

  /* Content band remains narrower and centered while title band spans wider visual band */
  .main-wrap .article{display:block}
  .title-area{background:transparent}

  /* Related: three columns grid */
  .related-list{grid-template-columns:repeat(3,1fr)}
  .related-list a{padding-right:12px}

  /* Increase line-length control for readable measure */
  .content-area{max-width:var(--content-width)}
}

/* Mobile rules - independent reflow for <=767px */
@media (max-width:767px){
  :root{--page-padding:12px;--gap:16px}
  body{font-size:15px}
  .page-wrap{padding:14px var(--page-padding)}

  /* Header is compact and left-aligned; title reduces and remains centered but content becomes full width */
  .brand a{font-size:16px}
  .title-area h1{font-size:20px}
  .meta-area{flex-direction:row;justify-content:space-between;font-size:12px}
  .summary{max-width:100%;padding-right:0}

  /* Content takes full width with safe side padding; prevents horizontal scroll at 320px */
  .content-area{max-width:100%;margin:0;padding:0}
  .content-area p{font-size:15px}

  /* Related becomes single column */
  .related-list{grid-template-columns:1fr}

  /* Ad slots full-width but non-sticky */
  .ad-slot{max-width:100%;margin:12px 0}

  .footer-row{flex-direction:column;gap:6px}
}

/* Accessibility helpers */
a:focus{outline:2px dashed rgba(43,27,18,0.2);outline-offset:2px}