:root{
  --graphite:#2b2d2e; /* 石墨灰 */
  --muted:#6b6d6f;
  --mustard:#c79b00; /* 芥末黄 */
  --bg:#ffffff;
  --max-width:1320px; /* 容器在1120—1440之间，取中值 */
  --container-min:1120px;
}
/* Base reset and typography */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  color:var(--graphite);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  font-family:-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.7;
  font-size:16px;
}
a{color:var(--graphite);text-decoration:none}
.container{max-width:var(--max-width);min-width:var(--container-min);margin:36px auto;padding:0 20px}

/* Header: 双层报头，第二层极窄 */
.site-header{padding:12px 0 0 0}
.header-top{display:flex;align-items:center;justify-content:flex-start;gap:12px}
.brand{font-weight:700;color:var(--graphite);font-size:20px}
.header-meta{margin-left:auto;color:var(--muted);font-size:13px}
.header-strip{height:6px;background:linear-gradient(90deg,var(--mustard) 0%,rgba(0,0,0,0) 100%);opacity:0.12;margin-top:8px;border-radius:2px}

/* Article header: 标题与摘要左右分置 */
.article{background:transparent}
.article-header{margin-bottom:16px}
.title-area{display:flex;align-items:flex-start;gap:24px}
.title{margin:0;font-family:Georgia,Times,serif;font-size:36px;line-height:1.15;color:var(--graphite);font-weight:600}
.title::first-letter{color:var(--mustard);font-weight:700}
.summary{margin:4px 0 0 0;color:var(--muted);max-width:48%;font-size:16px}
.meta-row{margin-top:12px;color:var(--muted);font-size:13px;display:flex;gap:12px}
.chapter-sep{border:none;border-top:1px solid rgba(43,45,46,0.06);margin:20px 0}

/* Layout grid: by default stack; desktop override sets two-column non-symmetric grid */
.layout-grid{display:block}
.content{min-height:200px}
.sidebar{margin-top:20px}
.side-block{padding:18px 14px;border-radius:2px;margin-bottom:18px;background:transparent}
.side-title{margin:0 0 8px 0;font-size:14px;color:var(--graphite);font-weight:600}
.side-body{color:var(--muted);font-size:14px}

/* Ad slots: independent, non-floating */
.ad-slot{margin:18px 0;padding:8px;border-radius:2px;background:transparent;color:var(--muted);font-size:14px}
.ad-top{margin-top:6px}

/* FAQ pattern: 主题色顶部边线问答区 */
.faq{margin-top:22px;padding-top:12px}
.faq-title{margin:0 0 10px 0;font-size:18px;border-top:3px solid var(--mustard);padding-top:8px;color:var(--graphite);font-weight:600}
.faq-body{color:var(--muted);font-size:15px}

/* Related: 底部短卡风格，无阴影 */
.related{margin-top:24px}
.related-title{font-size:18px;margin:0 0 12px 0;color:var(--graphite);font-weight:600}
.related-grid{display:grid;grid-template-columns:repeat(1,1fr);gap:14px}
.related-grid > *{padding:12px;border-radius:2px;background:transparent;border-top:1px solid rgba(43,45,46,0.04);color:var(--muted);font-size:14px}

/* Footer */
.site-footer{padding:28px 0 60px 0;color:var(--muted);font-size:13px;text-align:center}

/* Desktop rules (>=1024px) — 明确要求 */
@media (min-width:1024px){
  body{font-size:17px}
  .container{padding:0 28px}
  /* Title composition: make title and summary left/right within container */
  .title-area{display:grid;grid-template-columns:1fr 360px;align-items:start}
  .summary{max-width:100%;margin-top:6px}

  /* 非对称网格：正文8列，右栏4列（总12栅格） */
  .layout-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:28px;align-items:start}
  .content{grid-column:1 / span 8}
  .sidebar{grid-column:9 / span 4;display:flex;flex-direction:column;gap:18px}

  /* 右栏两个信息区不同高度（上短下较高） */
  .side-keywords{flex:0 0 auto}
  .side-brief{flex:1 1 auto}
  .side-keywords .side-body{white-space:normal}

  /* Related bottom: 四列 */
  .related-grid{grid-template-columns:repeat(4,1fr);gap:18px}
  .related-grid > *{padding:10px}

  /* 更大版面时，标题更大 */
  .title{font-size:44px}
}

/* Mobile rules (<=767px) — 明确要求 */
@media (max-width:767px){
  :root{--max-width:100%}
  .container{padding:14px;margin:18px auto}
  .header-top{padding:0 2px}
  .title{font-size:20px}
  /* 标题与摘要改为上下堆叠 */
  .title-area{display:block}
  .summary{max-width:100%;margin-top:8px}
  .meta-row{display:flex;flex-direction:row;gap:10px;font-size:12px}

  /* 单列流式，侧栏信息区下移为正文后的两段列表（顺序自然重排） */
  .layout-grid{display:block}
  .content{order:0}
  .sidebar{order:1;margin-top:18px}
  .side-block{padding:12px}

  /* 将侧栏块呈现为独立的列表段落，紧凑而清晰 */
  .sidebar{display:block}
  .side-block + .side-block{margin-top:12px}

  /* 中部广告与 faq 在正文后自然排列 */
  .ad-slot{font-size:13px}

  /* 底部相关阅读变为单列 */
  .related-grid{grid-template-columns:1fr}
  .related-grid > *{padding:12px}

  /* 防止横向滚动 */
  img,table,pre,iframe{max-width:100%;height:auto}
  body{word-break:break-word}
}

/* Accessibility & small tweaks */
h1,h2,h3{line-height:1.2}
hr{border:none}