:root{
  --aa6-bg: #f3f8ff;
  --aa6-surface: #ffffff;
  --aa6-border: rgba(0,0,0,.10);
  --aa6-accent: #2563eb;
  --aa6-ink: #0f172a;
}

html,body{background:var(--aa6-bg);color:var(--aa6-ink);}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}

.aa6-top{position:sticky;top:0;z-index:30;background:rgba(243,248,255,.92);backdrop-filter:saturate(170%) blur(10px);border-bottom:1px solid var(--aa6-border);padding:.75rem 0;}
.aa6-top-inner{display:flex;align-items:flex-end;justify-content:space-between;gap:1rem;flex-wrap:wrap;}
#logo a{font-weight:900;letter-spacing:.2px;text-decoration:none;color:inherit;}
.aa6-tag{opacity:.8;max-width:70ch;}

.aa6-shell{display:grid;grid-template-columns: 300px 1fr;gap:1rem;max-width:1100px;margin:0 auto;padding:1rem 1rem 2rem;}
.aa6-side{background:var(--aa6-surface);border:1px solid var(--aa6-border);border-radius:16px;padding:1rem;position:sticky;top:78px;align-self:start;}
.aa6-nav{list-style:none;margin:0;padding:0;display:grid;gap:.25rem;}
.aa6-nav-item a{display:block;padding:.5rem .6rem;border-radius:12px;text-decoration:none;color:inherit;border:1px solid transparent;}
.aa6-nav-item a:hover{border-color:var(--aa6-border);}
.aa6-nav-item.is-active a{background:rgba(37,99,235,.12);border-color:rgba(37,99,235,.22);}
.aa6-side-note{margin-top:1rem;padding:.75rem;border-radius:14px;background:rgba(37,99,235,.06);border:1px dashed rgba(37,99,235,.20);}

.aa6-main{min-width:0;}
.aa6-paper{background:var(--aa6-surface);border:1px solid var(--aa6-border);border-radius:16px;padding:1.1rem;}

@media (max-width: 920px){
  .aa6-shell{grid-template-columns:1fr;}
  .aa6-side{position:relative;top:auto;}
}

#footer{border-top:1px solid var(--aa6-border);background:rgba(255,255,255,.70);padding:1.25rem 0;}
#footer .container{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;}
#footer .social{display:flex;gap:.5rem;}
#footer .social a{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:14px;border:1px solid var(--aa6-border);text-decoration:none;background:rgba(255,255,255,.7);}