:root{--bg:#f6fbf8;--panel:#ffffff;--ink:#0f172a;--muted:#64748b;--line:rgba(15,23,42,.12);--accent:#059669;--accent2:#0ea5e9;--shadow:0 14px 40px rgba(2,6,23,.08)}
*{box-sizing:border-box}
body{margin:0;background:radial-gradient(1200px 600px at 20% 0%, rgba(14,165,233,.10), transparent 60%),radial-gradient(1000px 600px at 80% 10%, rgba(5,150,105,.10), transparent 55%),var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,Arial}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1200px;margin:0 auto;padding:0 18px}
.sr-only{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}

#site-header{border-bottom:1px solid var(--line);background:rgba(255,255,255,.82);backdrop-filter:blur(8px) saturate(1.2);position:sticky;top:0;z-index:20}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
.brand{display:flex;flex-direction:column;gap:6px}
#logo a{font-weight:900;letter-spacing:.2px;color:var(--ink);font-size:18px}
.tagline{color:var(--muted);font-size:13px}
.ad{min-width:180px;max-width:360px}

#panes{display:grid;grid-template-columns:240px minmax(0,1fr) 320px;gap:16px;padding:18px 0 40px}
#sidenav{align-self:start;position:sticky;top:72px;background:rgba(255,255,255,.85);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:14px}
.nav-title{margin:0 0 10px;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
#sidenav ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
#sidenav a{display:block;padding:10px 10px;border-radius:12px}
#sidenav li.active a{background:rgba(5,150,105,.12);font-weight:850}

.pane{background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:18px}
.pane-soft{background:rgba(255,255,255,.86)}
.pane-title{margin:0 0 8px}
.muted{margin:0;color:var(--muted)}

#pane-main{min-width:0}
#pane-aside{display:flex;flex-direction:column;gap:14px;align-self:start;position:sticky;top:72px}

#footer{padding:18px 0 40px;border-top:1px solid var(--line);background:rgba(255,255,255,.55)}
#footer .social{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:10px}
#footer a[role="button"]{border:1px solid var(--line);border-radius:12px;padding:9px 10px;background:#fff}
#footer p{margin:0;color:var(--muted)}

@media (max-width: 1080px){
  #panes{grid-template-columns:220px 1fr}
  #pane-aside{position:static}
}
@media (max-width: 820px){
  .ad{display:none}
  #panes{grid-template-columns:1fr}
  #sidenav{position:static}
}