:root{
  --bg:#f6f6f6;
  --surface:#ffffff;
  --line:#e6e6e6;
  --text:#222222;
  --muted:#6b6b6b;
  --accent:#caa400; /* 芥末黄 */
  --graphite:#2f2f2f; /* 石墨灰 */
  --max-width:1280px; /* 在1120-1440范围内选择中间值 */
  --gap:20px;
  --mobile-gap:14px;
  --font-sans: "Helvetica Neue", Arial, "Noto Sans CJK SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* Reset-ish minimal */
*{box-sizing:border-box}
html,body{height:100%;background:var(--bg);color:var(--text);font-family:var(--font-sans);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.container{margin:18px auto;padding:18px;width:calc(100% - 40px);max-width:var(--max-width)}

/* Header: 报刊双层报头 */
.site-header{background:transparent;padding:6px 0 12px;border-bottom:1px solid var(--line)}
.toolbar{display:flex;align-items:center;gap:12px;padding:6px 12px}
.site-name{font-weight:700;color:var(--graphite);font-size:16px}
.breadcrumb{font-size:13px;color:var(--muted);margin-left:6px}
.header-ad{margin-left:auto;font-size:13px;color:var(--muted)}
.masthead{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;border-top:1px solid transparent;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.masthead-left{font-weight:600;color:var(--graphite)}

/* Article head: 标题与窄元信息列 */
.article-head{background:var(--surface);padding:18px;border:1px solid var(--line);border-left:3px solid transparent;border-radius:2px}
.article-title{font-size:28px;line-height:1.05;margin:0 0 8px;color:var(--graphite);font-weight:800;letter-spacing:-0.02em}
.article-title::first-letter{color:var(--accent)}
.meta-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font-size:13px;color:var(--muted)}
.meta-left{display:flex;gap:14px;align-items:center}
.summary{margin:6px 0 0;padding-top:8px;border-top:1px dashed var(--line);color:var(--muted);font-size:15px}

/* Layout grid for desktop (8 + 4) and mobile single column */
.layout{display:block;margin-top:18px}

.content{background:var(--surface);padding:16px;border:1px solid var(--line);border-radius:2px}
.article-body{color:var(--text);font-size:16px;line-height:1.65}
.article-body p{margin:0 0 12px}
.article-body h2, .article-body h3{margin:18px 0 8px;color:var(--graphite)}

.ad-middle{margin:18px 0;padding:10px;border:1px dashed var(--line);background:transparent;color:var(--muted);font-size:13px}
.faq{margin-top:18px}
.section-title{font-size:16px;margin:0 0 10px;color:var(--graphite)}
.faq-body{font-size:15px;color:var(--muted)}
.faq-body ol{padding-left:20px;margin:0}
.faq-body li{margin:8px 0}

.recommend{margin-top:18px;background:transparent;padding-left:0}
.recommend-head{font-weight:700;color:var(--graphite);margin-bottom:10px}
.recommend-list{display:grid;grid-gap:10px;color:var(--muted);font-size:14px}
.recommend-list a{color:var(--graphite)}

.ad-bottom{margin-top:20px;padding:10px;border-top:1px dashed var(--line);color:var(--muted);font-size:13px;text-align:center}

footer.site-footer{margin-top:30px;padding:20px 0;border-top:1px solid var(--line);text-align:center;color:var(--muted);font-size:13px}

/* Desktop rules - must include min-width:1024px */
@media (min-width:1024px){
  .container{width:calc(100% - 80px);max-width:var(--max-width);padding:24px}
  .article-head{padding:22px 26px}
  .article-title{font-size:36px}
  .layout{display:grid;grid-template-columns:repeat(12,1fr);grid-column-gap:24px;align-items:start}
  /* Title and summary are full-width above grid (handled by article-head) */
  .content{grid-column:span 8}
  .recommend{grid-column:span 4;padding:16px;border-left:1px solid var(--line)}
  .recommend-list{grid-template-columns:repeat(2,1fr);grid-auto-rows:minmax(40px,auto)}
  /* Related pattern: 四列紧凑标题网格 — implemented inside recommend-list items if links supply multiple items. Use nested grid for denser view */
  .recommend-list .dense-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:8px}
  .recommend-list .dense-grid a{display:block;padding:6px 4px;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
  .article-body{font-size:16px;line-height:1.65}
  .meta-row{font-size:13px}
}

/* Mobile rules - must include max-width:767px */
@media (max-width:767px){
  :root{--gap:var(--mobile-gap)}
  .toolbar{padding:8px;gap:8px}
  .masthead{display:none}
  .site-name{font-size:15px}
  .breadcrumb{display:none}
  .header-ad{font-size:12px}
  .container{padding:12px;width:100%}
  .article-head{padding:12px;border-left:0;border-right:0;border-radius:0}
  .article-title{font-size:20px}
  .article-title::first-letter{font-size:1.2em}
  .meta-row{flex-direction:column;align-items:flex-start;gap:6px}
  .summary{border-top:1px solid var(--line);padding-top:10px}
  .layout{display:block}
  .content{padding:12px;border-left:0;border-right:0}
  .recommend{padding:12px;border-top:1px solid var(--line);margin-top:12px}
  .recommend-list{display:block}
  .recommend-list a{display:block;padding:10px 0;border-bottom:1px dashed var(--line)}
  .article-body{font-size:15px;line-height:1.7}
  .ad-middle{margin:14px 0}
  .ad-bottom{margin:16px 0}
  /* Ensure no horizontal scroll at 320px */
  body,html{overflow-x:hidden}
}

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

/* Visual signature enforcement: 禁止使用发光或渐变按钮（保证无此样式） */
button{background:none;border:1px solid var(--line);padding:6px 10px;border-radius:2px}