:root{
  --primary:#1565c0;
  --text:#1f2328;
  --muted:#57606a;
  --bg:#ffffff;
  --line:#d0d7de;
  --maxw:1040px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;font-size:16px}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}

/* 页眉 */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:100}
.header-inner{max-width:var(--maxw);margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:16px}
.logo{font-weight:700;font-size:18px;color:var(--text)}
.site-nav{margin-left:auto;display:flex;gap:18px}
.site-nav a{color:var(--text)}
.nav-toggle{display:none;margin-left:auto;font-size:22px;background:none;border:1px solid var(--line);border-radius:8px;padding:4px 10px;cursor:pointer}
.mobile-drawer{display:none;background:#f6f8fa;border-bottom:1px solid var(--line)}
.mobile-drawer.open{display:block}
.drawer-nav{display:flex;flex-direction:column;padding:8px 16px}
.drawer-nav a{padding:10px 0;border-bottom:1px solid var(--line)}

/* 页脚 */
.site-footer{background:#f6f8fa;border-top:1px solid var(--line);margin-top:48px;padding:24px 16px}
.footer-inner{max-width:var(--maxw);margin:0 auto;text-align:center;color:var(--muted);font-size:14px}
.footer-links a{margin:0 4px}
.footer-filing{margin:8px 0}
.footer-copy{margin:8px 0}

/* 通用布局 */
main{max-width:var(--maxw);margin:0 auto;padding:24px 16px}
h1{font-size:28px;line-height:1.3}
h2{font-size:22px;margin-top:32px;border-left:4px solid var(--primary);padding-left:10px}
h3{font-size:18px;margin-top:24px}
table{border-collapse:collapse;width:100%;margin:16px 0;font-size:14px}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left}
th{background:#f6f8fa}
.summary-block{background:#f6f8fa;border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:16px 0;color:var(--muted)}
.references,.related-block,.faq-block{margin-top:32px}
.faq-item{border:1px solid var(--line);border-radius:8px;padding:8px 12px;margin:8px 0}
.faq-item summary{cursor:pointer;font-weight:600}
.tag-text{display:inline-block;background:#eef2f6;border-radius:6px;padding:2px 8px;font-size:12px;color:var(--muted);margin-right:6px}
.item-list{list-style:none;padding:0;margin:0}
.item-row{border-bottom:1px solid var(--line);padding:16px 0}
.item-title{font-size:18px;font-weight:600}
.item-summary{color:var(--muted);margin:6px 0}
.item-meta{color:var(--muted);font-size:13px;margin:0}
.pager{display:flex;gap:16px;margin-top:24px;flex-wrap:wrap}
.pagination{display:flex;gap:8px;margin-top:24px;flex-wrap:wrap}
.pagination a,.pagination .current{padding:6px 12px;border:1px solid var(--line);border-radius:6px}
.related-list{list-style:none;padding-left:0}
.related-list li{padding:4px 0}

/* 列表页：左侧分类列表 + 右侧内容（[M1']） */
.list-layout{display:flex;gap:32px;align-items:flex-start}
.cat-side{flex:0 0 200px;position:sticky;top:80px}
.cat-side-title{font-weight:700;margin:0 0 8px}
.category-list{list-style:none;margin:0;padding:0}
.category-list li{padding:8px 10px;border-radius:6px;margin-bottom:2px}
.category-list li:hover{background:#eef2f6}
.category-list li.active{background:#e3f0ff;font-weight:600}
.category-list a{color:var(--text)}
.cat-content{flex:1 1 auto;min-width:0}

/* 详情页：正文 + 右侧 sticky TOC（[M1''] + A1） */
.article-layout{display:flex;gap:32px;align-items:flex-start;max-width:var(--maxw);margin:0 auto}
.article-body{max-width:760px;flex:1 1 760px;min-width:0}
.toc-aside{width:240px;flex:0 0 240px;position:sticky;top:80px;max-height:calc(100vh - 100px);overflow-y:auto;padding-right:8px}
.toc-title{font-weight:700;margin:0 0 8px}
.toc-list{list-style:none;margin:0;padding-left:0;font-size:14px}
.toc-list li{padding:4px 0}
.toc-list a{color:var(--muted)}

/* 面包屑 */
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:12px}
.breadcrumb-list{list-style:none;display:flex;gap:6px;padding:0;margin:0;flex-wrap:wrap}
.breadcrumb-list li:not(:last-child)::after{content:"›";margin-left:6px;color:var(--muted)}

/* 悬浮按钮（[M4'']） */
.float-rail{position:fixed;right:20px;bottom:20px;z-index:9999;display:flex;flex-direction:column;gap:12px}
.float-btn{display:inline-flex;align-items:center;gap:8px;min-width:56px;min-height:56px;padding:0 16px;border:none;border-radius:12px;background:var(--primary);color:#fff;font-size:14px;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.2)}
.float-top{background:#333}
.float-btn[hidden]{display:none}

/* 底部引流广告条 */
.bottom-ad{position:fixed;left:0;right:0;bottom:0;z-index:9998;display:flex;align-items:center;gap:12px;
  background:linear-gradient(90deg,var(--primary),#0d47a1);color:#fff;padding:10px 16px;
  box-shadow:0 -2px 10px rgba(0,0,0,.15);font-size:15px}
.bottom-ad[hidden]{display:none}
.bottom-ad-tag{flex:0 0 auto;background:rgba(255,255,255,.2);border-radius:6px;padding:2px 8px;font-size:12px;line-height:1.6}
.bottom-ad-link{flex:1 1 auto;min-width:0;display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none}
.bottom-ad-link:hover{text-decoration:none}
.bottom-ad-text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1 1 auto}
.bottom-ad-cta{flex:0 0 auto;background:#fff;color:var(--primary);border-radius:999px;padding:4px 14px;font-weight:600;white-space:nowrap}
.bottom-ad-close{flex:0 0 auto;background:transparent;border:none;color:#fff;font-size:22px;line-height:1;cursor:pointer;padding:0 6px}
body.has-bottom-ad{padding-bottom:48px}
body.has-bottom-ad .float-rail{bottom:64px}
.weixin-dialog{border:none;border-radius:12px;padding:16px;max-width:320px}
.weixin-dialog::backdrop{background:rgba(0,0,0,.4)}
.weixin-dialog-inner{text-align:center}
.weixin-img{width:240px;height:auto;object-fit:contain;border-radius:12px}
.weixin-close{margin-top:12px;border:1px solid var(--line);border-radius:8px;padding:6px 16px;cursor:pointer}

/* 首页 */
.hero{padding:32px 0;text-align:center}
.hero-title{font-size:32px}
.hero-sub{color:var(--muted)}
.home-link-list{list-style:none;padding-left:0}
.home-link-list li{padding:6px 0;border-bottom:1px solid var(--line)}
.compare-table{font-size:14px}
.center-text{text-align:center}
.btn-link{display:inline-block;margin:0 6px}

/* 作者权威露出（[M20a]） */
.author-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:12px 0;padding:10px 12px;background:#f6f8fa;border:1px solid var(--line);border-radius:10px}
.author-card-link{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}
.author-avatar{width:44px;height:44px;border-radius:50%;object-fit:cover;flex:0 0 44px}
.author-avatar-text{display:inline-flex;align-items:center;justify-content:center;background:var(--primary);color:#fff;font-weight:700;font-size:18px}
.author-meta-text{display:flex;flex-direction:column;line-height:1.4}
.author-name{font-weight:700}
.author-job{font-size:13px;color:var(--muted)}
.author-bio-line{font-size:13px;color:var(--muted)}
.article-updated{font-size:12px;color:var(--muted);margin-left:auto}

/* 实践经验 callout（[M20d]） */
.case-study{border:1px solid #bcd2ef;background:#eef4fb;border-left:4px solid var(--primary);border-radius:10px;padding:12px 16px;margin:24px 0}
.case-study-title{font-weight:700;margin:0 0 6px}
.case-study-body{margin:0;color:var(--text)}

/* 团队声明（[M20f]） */
.team-statement{font-size:13px;color:var(--muted);margin-top:8px}
.author-grid-list{list-style:none;padding:0;display:grid;gap:16px}
.author-card{border:1px solid var(--line);border-radius:10px;padding:16px}
.author-title{color:var(--muted);font-size:14px;margin:4px 0}
.author-bio{color:var(--muted);font-size:14px}
.author-card-meta{font-size:13px;color:var(--muted)}

/* 移动端（[M15]） */
@media (max-width:768px){
  .site-nav{display:none}
  .nav-toggle{display:block}
  .list-layout{flex-direction:column;gap:12px}
  .cat-side{position:static;flex:none;width:100%;max-height:60vh;overflow-y:auto}
  .article-layout{flex-direction:column}
  .toc-aside{position:static;width:100%;max-width:none;max-height:none;order:-1}
  .article-body{max-width:100%}
  table{display:block;overflow-x:auto;white-space:nowrap}
}
@media (min-width:769px) and (max-width:1199px){
  .article-layout{flex-direction:column}
  .toc-aside{position:static;width:100%;max-width:none;order:-1;max-height:60vh}
}