:root{
  --aa21-accent:#0ea5e9;
  --aa21-border:rgba(15,23,42,.14);
  --aa21-soft:#f6f7f9;
}

*{box-sizing:border-box}

.aa21-wrap{max-width:980px;margin:0 auto;padding:0 14px}

.aa21-top{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(150%) blur(10px);
  border-bottom:1px solid var(--aa21-border);
}

.aa21-top-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 0}

#logo.aa21-logo{display:flex;align-items:center;gap:10px}
#logo.aa21-logo img{height:34px;width:auto;display:block}

.aa21-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.aa21-pill{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--aa21-border);background:var(--aa21-soft);padding:6px 10px;border-radius:999px;font-size:.9rem}
.aa21-pill strong{color:var(--aa21-accent)}

.aa21-shell{display:grid;grid-template-columns: 260px minmax(0,1fr);gap:14px;padding:14px 0 26px}
.aa21-nav{position:sticky;top:74px;align-self:start;border:1px solid var(--aa21-border);border-radius:16px;background:#fff;overflow:hidden}
.aa21-nav-h{padding:10px 12px;border-bottom:1px solid var(--aa21-border);background:var(--aa21-soft);font-weight:700}
.aa21-nav-b{padding:10px 12px}
.aa21-nav-b a{display:block;padding:8px 10px;border-radius:12px;text-decoration:none;border:1px solid transparent}
.aa21-nav-b a:hover{border-color:var(--aa21-border)}
.aa21-nav-b a.is-active{border-color:rgba(14,165,233,.35);background:rgba(14,165,233,.08)}

.aa21-content{min-width:0;border:1px solid var(--aa21-border);border-radius:16px;background:#fff;padding:18px}
.aa21-content :where(h1,h2,h3){scroll-margin-top:90px}

@media (max-width: 960px){
  .aa21-shell{grid-template-columns:1fr}
  .aa21-nav{position:relative;top:auto}
}