:root{
  --ink:#0A0F1E; --ink-2:#121a2e; --panel:#101a30;
  --line:#22304d; --text:#e8eef7; --muted:#9fb0c9;
  --cyan:#2FB8FF; --mint:#16E0BD; --amber:#FF8A3D;
}
*{box-sizing:border-box;}
body.stna-body{margin:0;background:var(--ink);color:var(--text);
  font-family:-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7;}
a{color:var(--cyan);text-decoration:none;}
a:hover{text-decoration:underline;}

/* 顶部导航 */
.stna-top{position:sticky;top:0;z-index:50;background:rgba(10,15,30,.92);border-bottom:1px solid var(--line);}
.stna-top-inner{max-width:1200px;margin:0 auto;padding:0 16px;display:flex;align-items:center;height:60px;gap:18px;}
.stna-brand{font-weight:700;font-size:18px;color:var(--text);}
.stna-nav{margin-left:auto;}
.stna-nav-list{display:flex;gap:18px;list-style:none;margin:0;padding:0;align-items:center;}
.stna-nav-item{position:relative;}
.stna-nav-sub{display:none;position:absolute;top:100%;left:0;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:6px 0;min-width:170px;z-index:60;}
.stna-nav-item:hover .stna-nav-sub{display:block;}
.stna-nav-sub li{padding:4px 14px;white-space:nowrap;}
.stna-nav-toggle{display:none;background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:6px;padding:6px 12px;cursor:pointer;}

.stna-container{max-width:1200px;margin:0 auto;padding:18px 16px 40px;}
.stna-crumb{font-size:13px;color:var(--muted);margin-bottom:14px;}
.stna-crumb a{color:var(--muted);}
.stna-crumb a:hover{color:var(--cyan);}

/* 详情/列表栅格：内容 + 240px 侧栏（满足 M27 240px minmax） */
.stna-layout-grid{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:28px;align-items:start;}
.stna-content-main{min-width:0;}
.stna-content-main h1{font-size:28px;margin:0 0 14px;color:#fff;}
.stna-content-main h2{margin-top:28px;padding-top:12px;border-top:1px solid var(--line);font-size:22px;color:#fff;}
.stna-content-main h3{margin-top:20px;font-size:18px;color:var(--mint);}
.stna-content-main p{margin:10px 0;}
.stna-content-main blockquote{border-left:3px solid var(--cyan);background:rgba(47,184,255,.08);margin:14px 0;padding:10px 14px;color:var(--muted);}
.stna-content-main ul,.stna-content-main ol{padding-left:22px;}
.stna-content-main li{margin:4px 0;}
.stna-content-main table{width:100%;border-collapse:collapse;margin:16px 0;background:var(--panel);}
.stna-content-main table.stna-spec,table.stna-spec{border:1px solid var(--line);}
.stna-content-main th,.stna-content-main td{border:1px solid var(--line);padding:8px 10px;font-size:14px;}
.stna-content-main th{background:var(--ink-2);color:var(--text);}
.stna-update{font-size:13px;color:var(--muted);}

/* 侧栏折叠面板（native details） */
.stna-toc-panel,.stna-cat-panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-bottom:16px;}
.stna-toc-panel summary,.stna-cat-panel summary{cursor:pointer;font-weight:600;color:var(--text);}
.stna-toc-panel ul,.stna-cat-panel ul{list-style:none;margin:8px 0 0;padding:0;}
.stna-toc-panel li,.stna-cat-panel li{margin:5px 0;font-size:14px;}
.stna-toc-panel a,.stna-cat-panel a{color:var(--muted);}
.stna-toc-panel a:hover,.stna-cat-panel a:hover{color:var(--cyan);}

/* 卡片栅格 */
.stna-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;}
.stna-card{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:14px;transition:.15s;}
.stna-card:hover{border-color:var(--cyan);transform:translateY(-2px);}
.stna-card h3{margin:0 0 6px;font-size:16px;color:#fff;}
.stna-card p{margin:0;font-size:13px;color:var(--muted);}
.stna-sec-intro{color:var(--muted);margin:6px 0 14px;font-size:14px;}
.stna-tag-wrap{display:flex;flex-wrap:wrap;gap:10px;margin:4px 0 6px;}
.stna-tag{display:inline-block;background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-size:14px;color:var(--muted);transition:.15s;}
.stna-tag:hover{border-color:var(--cyan);color:#fff;}
.stna-side{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 14px;}
.stna-side h3{margin:0 0 8px;font-size:15px;color:#fff;}
.stna-side ul{list-style:none;margin:0;padding:0;}
.stna-side li{margin:5px 0;font-size:14px;}
.stna-side a{color:var(--muted);}
.stna-hero{background:linear-gradient(135deg,#102038,#0a1530);border:1px solid var(--line);border-radius:14px;padding:28px;margin-bottom:22px;}
.stna-hero h1{margin:0 0 8px;font-size:30px;color:#fff;}
.stna-hero p{margin:0;color:var(--muted);}
.stna-sec-title{font-size:20px;color:#fff;margin:24px 0 12px;border-left:3px solid var(--mint);padding-left:10px;}

/* FAQ 折叠 */
details.stna-faq{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:10px 12px;margin:10px 0;}
details.stna-faq summary{cursor:pointer;font-weight:600;color:var(--text);}
details.stna-faq p{margin:8px 0 0;color:var(--muted);font-size:14px;}

/* 页脚 */
.stna-foot{border-top:1px solid var(--line);background:var(--ink-2);margin-top:30px;}
.stna-foot-inner{max-width:1200px;margin:0 auto;padding:28px 16px 0;}
.stna-foot-cols{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.stna-foot-title{font-size:15px;color:#fff;margin:0 0 10px;}
.stna-foot-col ul{list-style:none;margin:0;padding:0;}
.stna-foot-col li{margin:6px 0;font-size:14px;color:var(--muted);}
.stna-foot-col a{color:var(--muted);}
.stna-copy{text-align:center;color:var(--muted);font-size:13px;padding:14px;border-top:1px solid var(--line);margin-top:22px;}

/* 悬浮胶囊 */
.stna-float{position:fixed;right:16px;bottom:20px;display:flex;flex-direction:column;gap:8px;z-index:60;}
.stna-float-pill{background:var(--panel);border:1px solid var(--line);color:var(--text);border-radius:20px;padding:8px 14px;cursor:pointer;font-size:13px;}
.stna-float-pill:hover{border-color:var(--cyan);}
.stna-card-pop{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:70;}
.stna-card-pop[hidden]{display:none;}
.stna-card-pop img{max-height:80vh;border-radius:10px;}
.stna-card-close{position:absolute;top:20px;right:20px;background:var(--panel);border:1px solid var(--line);color:#fff;border-radius:6px;padding:6px 12px;cursor:pointer;}

/* 响应式：断点 1024（满足 M25） */
@media (max-width:1024px){
  .stna-layout-grid{grid-template-columns:1fr;}
  .stna-foot-cols{grid-template-columns:1fr;}
  .stna-nav-list{display:none;position:absolute;top:60px;right:16px;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:10px;gap:8px;}
  .stna-nav-list.open{display:flex;}
  .stna-nav-sub{position:static;display:block;border:none;background:transparent;padding:0 0 0 10px;}
  .stna-nav-toggle{display:inline-block;margin-left:auto;}
}