:root{--bg-primary: #f5f7fb;--bg-secondary: #ffffff;--bg-card: #ffffff;--bg-card-hover: #f8fafc;--bg-sidebar: #ffffff;--text-primary: #1e293b;--text-secondary: #475569;--text-muted: #64748b;--text-heading: #0f172a;--accent-blue: #3b82f6;--accent-cyan: #06b6d4;--accent-green: #10b981;--accent-yellow: #f59e0b;--accent-red: #ef4444;--accent-purple: #8b5cf6;--border-color: #e2e8f0;--border-light: #cbd5e1;--gradient-blue: linear-gradient(135deg, #3b82f6, #06b6d4);--gradient-purple: linear-gradient(135deg, #8b5cf6, #3b82f6);--gradient-green: linear-gradient(135deg, #10b981, #06b6d4);--font-sans: "Inter", "Noto Sans SC", -apple-system, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;--space-sm: 8px;--space-md: 12px;--space-lg: 20px;--space-xl: 24px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--shadow-glow-blue: 0 10px 28px rgba(37,99,235,.16);--shadow-card: 0 10px 30px 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var(--border-color);position:relative}.logo-icon{width:36px;height:36px;background:var(--gradient-blue);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center}.brand-text{font-size:1.05rem;font-weight:700;color:var(--text-heading);letter-spacing:-.02em}.brand-sub{font-size:.72rem;color:var(--text-muted);margin-top:1px}.sys-sidebar-nav{flex:1;overflow-y:auto;padding:8px 0}.sys-nav-section{margin-bottom:4px}.sys-nav-label{font-size:.7rem;font-weight:600;text-transform:uppercase;color:var(--text-muted);letter-spacing:.05em;padding:12px 20px 6px}.sys-nav-item{display:flex;align-items:center;gap:12px;width:calc(100% - 16px);padding:10px 20px;margin:2px 8px;border:none;border-radius:var(--radius-md);background:transparent;cursor:pointer;color:var(--text-secondary);font-size:.9rem;text-align:left;transition:all .15s 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