:root{
  --bg:#f6f4f2; /* warm gray background */
  --ink:#181717; /* charcoal */
  --muted:#7a6f68; /* warm gray dark */
  --accent:#2b2b2b; /* for lines */
  --max-width:1280px; /* desktop container target */
  --read-width:720px; /* main readable column */
  --aside-width:300px;
  --base-font: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --line-height:1.75;
  --baseline:1rem; /* baseline grid unit */
}

/* Reset & sensible defaults */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--base-font);
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:var(--line-height);
  font-size:16px;
}

a{color:inherit;text-decoration:none}

/* Header */
.site-header{padding:18px 20px 8px;text-align:center}
.header-inner{max-width:var(--max-width);margin:0 auto;display:flex;align-items:center;justify-content:center;gap:12px}
.brand .home{font-weight:700;letter-spacing:0.02em;color:var(--ink)}
.topline-nav{font-size:13px;color:var(--muted);padding-left:8px}
.header-divider{border:0;border-top:1px solid rgba(43,43,43,0.08);margin:12px auto 0;max-width:var(--max-width)}

/* Ad wrapper (non-sticky, independent) */
.ad-wrapper{max-width:var(--max-width);margin:12px auto;padding:6px 10px;text-align:center;color:var(--muted);font-size:13px}
.ad-wrapper > *{display:inline-block}
.ad-top-region{margin-top:6px}
.ad-bottom-region{margin-bottom:18px}
.ad-middle{margin-top:22px;margin-bottom:22px}

/* Page container and grid */
.page-container{padding:18px 16px 24px}
.content-grid{display:grid;grid-template-columns:1fr minmax(0, var(--read-width)) minmax(0, var(--aside-width)) 1fr;gap:28px;align-items:start;max-width:var(--max-width);margin:0 auto}
.article-column{grid-column:2/3}
.aside-column{grid-column:3/4}
.gutter{display:none}

/* Title composition */
.eyebrow{font-size:13px;color:var(--muted);text-align:center;margin-bottom:6px}
h1{font-size:26px;margin:0 0 10px;text-align:center;font-weight:700;letter-spacing: -0.01em}
.meta{display:flex;gap:12px;justify-content:center;font-size:13px;color:var(--muted);margin-bottom:12px}
.summary{font-size:15px;color:var(--muted);margin:0 0 18px;text-align:left}

/* Article body with dual baseline grid signature */
.article-body{
  font-size:16px;color:var(--ink);
  background-image:repeating-linear-gradient(to bottom, transparent 0, transparent calc(var(--baseline) * 1 - 0.5px), rgba(0,0,0,0.02) calc(var(--baseline) * 1 - 0.5px), rgba(0,0,0,0.02) calc(var(--baseline) * 1));
  background-size:100% calc(var(--baseline) * 1);
  padding:6px 0 30px;
  word-wrap:break-word;
}
.article-body p{margin:0 0 1rem}

/* FAQ pattern: horizontal rule between items */
.faq-list{margin-top:6px;border-top:1px solid rgba(43,43,43,0.06);padding-top:12px}
.faq-list h2{font-size:15px;margin:0 0 10px;color:var(--accent)}
.faq-container > *{padding:10px 0;border-bottom:1px solid rgba(43,43,43,0.04)}
.faq-container b, .faq-container strong{color:var(--ink)}

/* Related pattern: three-column short cards, no shadow */
.related-block{margin-top:18px}
.related-block h2{font-size:15px;margin:0 0 10px;color:var(--accent)}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.related-grid > *{background:transparent;padding:8px 6px;border-radius:4px;border:1px solid transparent;font-size:14px}
.related-grid a{display:block;color:var(--ink)}

/* Aside box (compact annotation column) */
.aside-box{background:transparent;padding:6px 8px;border-left:1px solid rgba(43,43,43,0.04)}
.aside-item{font-size:13px;color:var(--muted);margin-bottom:12px}
.aside-item .aside-text{color:var(--ink);margin-top:6px}

/* Footer */
.site-footer{padding:18px 10px;text-align:center;color:var(--muted);font-size:13px}

/* Desktop-specific rules (must include min-width:1024px per contract) */
@media (min-width:1024px){
  body{font-size:16px}
  .gutter{display:block}
  .content-grid{gap:36px}
  .article-column{padding:6px 12px 0}
  h1{font-size:30px;max-width:min(720px,80vw);margin-left:auto;margin-right:auto}
  .summary{max-width:720px;margin-left:auto;margin-right:auto}
  .aside-column{position:relative;top:6px}
  .related-grid{gap:12px}
}

/* Ensure container width sits between 1120px and 1440px where possible */
@media (min-width:1120px){
  .content-grid{max-width:var(--max-width);grid-template-columns:1fr minmax(0, var(--read-width)) minmax(0, var(--aside-width)) 1fr}
}

/* Mobile rules (must include max-width:767px per contract) */
@media (max-width:767px){
  :root{--line-height:1.6}
  .header-inner{flex-direction:column;gap:6px}
  .header-divider{margin-top:8px}
  .page-container{padding:12px}
  .content-grid{display:block;max-width:720px;padding:0 6px;margin:0 auto}
  .article-column{grid-column:auto;padding:0}
  .aside-column{display:block;margin-top:18px}
  .gutter{display:none}
  h1{text-align:left;font-size:20px;margin-bottom:8px}
  .eyebrow{text-align:left}
  .meta{justify-content:flex-start;flex-wrap:wrap}
  .summary{text-align:left}
  .article-body{background-image:none;padding:4px 0 18px}
  .related-grid{grid-template-columns:1fr;gap:8px}
  .related-grid > *{padding:10px 0;border-top:1px solid rgba(43,43,43,0.04)}
  .aside-box{border-left:0;border-top:1px solid rgba(43,43,43,0.04);padding-top:12px}
  .site-footer{padding:14px}
  /* ensure no horizontal scrolling at 320px */
  html,body{overflow-x:hidden}
}

/* Accessibility modest tweaks */
h1, h2{line-height:1.1}

/* Visual signature: avoid gradients, glows, heavy shadows (forbidden patterns honored) */
/* Colors limited to charcoal and warm gray palette; no blue-purple gradients or glowing buttons used. */