:root{--brand: #111827;--accent: #f97316;--bg: #f3f4f6;--muted: #6b7280}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:var(--bg);color:var(--brand)}.sidebar-link{display:block;padding:10px 12px;border-radius:8px;color:var(--brand)}.sidebar-link.active{background:#e5e7eb}