:root{
  --paper:#f7f3ea; /* 纸白 */
  --ink:#0b2a3a;   /* 藏蓝/深墨 */
  --muted:#6b7780;
  --line:rgba(11,42,58,0.12);
  --max-width:1200px; /* 在1120-1440范围内 */
  --gap:20px;
  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

/* Basic reset and surface */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.55;
}

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

/* Header: 报刊双层报头 */
.site-header{border-bottom:1px solid var(--line);background:linear-gradient(transparent, transparent)}
.header-top{
  display:flex;align-items:center;justify-content:space-between;
  padding:8px var(--gap);
  font-size:14px;color:var(--muted);
}
.site-home{font-weight:700;color:var(--ink)}
.index-bar{display:flex;gap:12px}
.idx-item{padding:4px 6px;border-left:1px solid var(--line)}

.masthead{
  display:flex;justify-content:space-between;align-items:center;
  padding:18px var(--gap);border-top:1px solid var(--line);
  background:transparent;color:var(--ink);
}
.masthead-left{font-family:var(--serif);font-size:28px;letter-spacing:0.4px}
.masthead-right{font-size:13px;color:var(--muted)}

/* Page wrap and grid skeleton */
.page-wrap{display:flex;justify-content:center;padding:18px}
.page-grid{
  width:100%;max-width:var(--max-width);
  display:block; /* desktop will enable grid */
}

/* Title block and article basics */
.title-block{padding:12px 16px;border:1px solid var(--line);background:transparent}
article h1{font-family:var(--serif);font-size:28px;margin:6px 0 8px;line-height:1.08;color:var(--ink)}
.article-meta{font-size:13px;color:var(--muted);margin-bottom:12px}
.article-meta .summary{margin:10px 0 0;color:var(--ink)}

.content-wrapper{padding-top:6px}
.content{font-size:16px;color:var(--ink);background:transparent}
.content p{margin:0 0 12px}

/* Blocks for columns on desktop (below will be activated) */
.col{padding:12px;border-left:1px solid transparent}
.faq-col{border-left:1px solid var(--line)}
.meta-track{border-left:1px solid var(--line)}
.minor-heading{font-size:14px;margin:0 0 8px;font-weight:700}
.faq{font-size:14px;color:var(--ink)}
.related-block{margin-top:18px;padding-top:12px;border-top:1px solid var(--line)}
.related-title{font-size:15px;margin:0 0 8px}
.related{font-size:14px}

/* Ad containers must be independent and non-intrusive */
.ad-container{max-width:var(--max-width);margin:12px auto;padding:10px;border:1px dashed var(--line);background:transparent;color:var(--muted);font-size:13px}
.ad-slot{margin-top:12px;border:1px dashed var(--line);padding:8px;font-size:13px;color:var(--muted)}

/* Footer visual signature: 宽屏索引式排版 */
.site-footer{border-top:1px solid var(--line);padding:18px;background:transparent}
.footer-index{display:flex;gap:24px;justify-content:space-between;max-width:var(--max-width);margin:0 auto}
.index-column h4{margin:0 0 6px;font-size:13px}
.footer-note{max-width:var(--max-width);margin:12px auto 0;color:var(--muted);font-size:13px}

/* Desktop specific: enforce ledger-grid blueprint */
@media (min-width:1024px){
  .title-block{grid-column:1/-1;border-left:0;border-right:0}
  .page-grid{display:grid;grid-template-columns:repeat(12,1fr);grid-auto-rows:min-content;gap:16px}

  /* Title occupies full 12 columns */
  .title-block{grid-column:1 / -1}

  /* Content column: columns 1-7 (7 cols) */
  .body-col{grid-column:1 / span 7;min-width:0}
  /* FAQ: cols 8-10 (3 cols) */
  .faq-col{grid-column:8 / span 3;border-left:1px solid var(--line)}
  /* Meta track: cols 11-12 (2 cols) */
  .meta-track{grid-column:11 / span 2}

  /* Place the article's visible content area to align with the 'body-col' */
  article{grid-column:1 / span 7}
  .related-block{grid-column:1 / -1}

  /* Strong rectangular line language, square corners */
  .title-block,.faq-col,.meta-track{border:1px solid var(--line)}

  /* Typography adjustments for desktop */
  article h1{font-size:32px;max-height:64px;overflow:hidden}
  .content{font-size:16px}
}

/* Mobile specific: grid解除，线框只保留为段落顶部细线；FAQ 单列 */
@media (max-width:767px){
  .page-wrap{padding:12px}
  .title-block{border:0;padding:8px}
  article h1{font-size:20px;margin-bottom:8px}
  .article-meta{display:block;padding:6px 0;border-top:1px solid var(--line)}
  .article-meta .summary{margin-top:8px}

  /* Stack order: title, meta, content, faq, related, ads */
  .page-grid{display:block}
  .col{border:0;padding:10px 0}
  .faq-col{border-top:1px solid var(--line);padding-top:12px}
  .meta-track{border-top:1px solid var(--line);padding-top:12px}

  /* FAQ single column */
  .faq{columns:1}

  /* Paragraph top thin line only */
  .content p{padding-top:8px;border-top:1px solid var(--line)}

  /* Footer stacks */
  .footer-index{flex-direction:column;gap:12px}
}

/* Accessibility & readable density */
h1,h2,h3,h4{color:var(--ink)}
p{color:var(--ink);margin:0 0 12px}

/* Related pattern: list with subtle separations and optional date area if present */
.related a{display:block;padding:8px 0;border-bottom:1px solid var(--line);color:var(--ink)}
.related time{float:right;color:var(--muted);font-size:12px}

/* Prevent horizontal scroll on smallest devices */
@media (max-width:320px){
  body{font-size:14px}
  .page-wrap{padding:8px}
}