:root{--bg: #f4f6fa;--panel: #ffffff;--border: #e2e8f0;--text: #1a202c;--muted: #64748b;--primary: #2563eb;--primary-dark: #1d4ed8;--green: #16a34a;--amber: #d97706;--red: #dc2626;--purple: #7c3aed;--sidebar: #0f172a;--sidebar-text: #cbd5e1;--radius: 10px;--shadow: 0 1px 3px rgba(15, 23, 42, .08)}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);font-size:14px}#root{display:flex;min-height:100vh}.sidebar{width:220px;background:var(--sidebar);color:var(--sidebar-text);padding:16px 0;flex-shrink:0;position:sticky;top:0;height:100vh;overflow-y:auto}.sidebar .brand{color:#fff;font-size:17px;font-weight:700;padding:4px 20px 14px;letter-spacing:.3px}.sidebar .brand span{color:#60a5fa}.nav-group{margin-bottom:10px}.nav-group-title{font-size:10.5px;text-transform:uppercase;letter-spacing:1.2px;color:#64748b;padding:8px 20px 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