:root{--bg: #f1f5f9;--surface: #ffffff;--border: #e2e8f0;--text: #0f172a;--muted: #64748b;--primary: #2563eb;--primary-dark: #1d4ed8;--danger: #dc2626;--success: #16a34a;--warning: #d97706;--radius: 10px;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .04)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);font-size:14px}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.app{display:flex;height:100vh;overflow:hidden}.sidebar{width:230px;flex-shrink:0;background:#0f172a;color:#cbd5e1;display:flex;flex-direction:column;padding:16px 0}.sidebar .brand{font-size:20px;font-weight:700;color:#fff;padding:8px 20px 20px;letter-spacing:1px}.sidebar nav{display:flex;flex-direction:column;gap:2px;padding:0 10px;flex:1}.sidebar nav a{color:#cbd5e1;padding:10px 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