:root{
  --bg:#f6f5f3; /* 轻纸张底色 */
  --text:#222226; /* 石墨灰 */
  --muted:#6b6b6b;
  --accent:#c8a300; /* 芥末黄 */
  --accent-contrast:#1f1f1f;
  --max-width:1280px; /* 在1120-1440之间 */
  --gap:24px;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--bg);color:var(--text);font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans","PingFang SC","Hiragino Sans GB","Microsoft Yahei",sans-serif;line-height:1.6}
.page-root{min-height:100vh;display:flex;flex-direction:column}
.site-header{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid rgba(0,0,0,0.06);background:transparent}
.site-header .brand a{font-weight:700;color:var(--text);text-decoration:none;font-size:18px}
.one-line-nav{font-size:13px;color:var(--muted);display:flex;gap:14px}
.one-line-nav span{opacity:.95}

/* 主区容器 */
.site-container{width:100%;margin:20px auto;padding:0 18px;display:grid;gap:var(--gap);align-items:start}
.left-rail{order:1}
.content-column{order:2}

/* 左侧与正文在桌面将呈现反向轨道(正文在右侧大列) */
@media (min-width:1024px){
  .site-container{max-width:var(--max-width);grid-template-columns:33.333% 66.667%;padding:0}
  .left-rail{padding-right:28px;border-right:1px solid rgba(0,0,0,0.04)}
  .content-column{padding-left:40px}
  .rail-top{margin-bottom:18px}
  .rail-brand a{font-weight:700;color:var(--text);text-decoration:none;font-size:18px}
  .rail-meta-desktop{margin-top:10px;color:var(--muted);font-size:13px}
  .rail-meta-desktop .meta-line{margin-bottom:6px}

  /* 标题构图：压左并以粗细横线构图 */
  .article-header h1{font-family: Georgia, "Times New Roman", serif;font-size:28px;margin:0 0 10px 0;line-height:1.2;color:var(--text);position:relative;padding-left:10px}
  .article-header h1:before{content:"";position:absolute;left:0;top:6px;width:6px;height:24px;background:var(--accent);}
  .article-header h1:after{content:"";position:absolute;left:0;bottom:-12px;width:60px;height:2px;background:rgba(0,0,0,0.08)}

  .excerpt{color:var(--muted);margin-bottom:14px}
  .article-body .content{font-size:17px;color:var(--text);line-height:1.9}

  /* 相关推荐侧栏样式：反向色块标题栏，带日期分隔线列表 */
  .related-side{margin-top:18px}
  .related-head{background:var(--accent);color:var(--accent-contrast);padding:8px 10px;font-weight:600}
  .related-list{margin-top:8px;border-top:1px solid rgba(0,0,0,0.06);font-size:14px}
  .related-list a{display:block;padding:10px 6px;text-decoration:none;color:var(--text);border-bottom:1px solid rgba(0,0,0,0.04)}
  .related-list a time{display:block;color:var(--muted);font-size:12px;margin-top:6px}

  /* FAQ 在正文之后 */
  .faq-block{margin-top:26px}
  .faq-block h2{font-size:16px;margin:0 0 10px 0;color:var(--text)}
  .faq-list details{margin-bottom:8px}
  .faq-list summary{cursor:pointer;font-weight:600}
  .faq-list summary::-webkit-details-marker{display:none}
  .faq-list details[open] summary{color:var(--accent-contrast)}
  .faq-list details p{margin:8px 0 0 0;color:var(--muted)}

  /* 广告容器样式，独立、不覆盖内容 */
  .ad{margin:18px 0;padding:8px;text-align:center;color:var(--muted);font-size:13px;border:1px dashed rgba(0,0,0,0.04);background:transparent}

  .site-footer{margin-top:auto;padding:18px;text-align:center;color:var(--muted);font-size:13px;border-top:1px solid rgba(0,0,0,0.04)}
}

/* 手机端布局：单列，左侧信息拆为标题前后的紧凑区块，正文为第一阅读主体 */
@media (max-width:767px){
  .site-container{display:block;padding:12px}
  .left-rail{display:none}
  .mobile-meta{font-size:13px;color:var(--muted);margin:8px 0}
  .mobile-meta-top{order:1}
  .article-header h1{font-size:20px;margin:6px 0 8px 0;font-family: Georgia, "Times New Roman", serif}
  .excerpt{font-size:14px;color:var(--muted);margin-bottom:10px}
  .article-body .content{font-size:16px;color:var(--text);line-height:1.8}
  .ad{margin:12px 0;padding:8px;font-size:13px}
  .faq-block h2{font-size:15px}
  .related-side{margin-top:18px}
  /* 将侧边相关阅读移至正文后，以自然区块呈现 */
  .related-side{display:block}
  .related-head{background:var(--accent);color:var(--accent-contrast);padding:8px 10px;font-weight:600}
  .related-list{border-top:1px solid rgba(0,0,0,0.06);margin-top:8px}
  .related-list a{display:block;padding:10px 6px;text-decoration:none;color:var(--text);border-bottom:1px solid rgba(0,0,0,0.04)}
}

/* 保证 320px 无横向滚动 */
@media (max-width:320px){
  body{font-size:14px}
  .article-body .content{word-wrap:break-word}
}

/* 可访问性小调整 */
a{color:var(--accent-contrast)}
h1,h2{line-height:1.25}