:root{--bg: #0f172a;--bg-soft: #1e293b;--panel: #ffffff;--muted: #64748b;--border: #e2e8f0;--primary: #2563eb;--primary-dark: #1d4ed8;--danger: #dc2626;--success: #16a34a;--warning: #d97706;--text: #0f172a;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .04)}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:#f1f5f9;color:var(--text);font-size:14px}a{color:var(--primary);text-decoration:none}.app-shell{display:flex;min-height:100vh}.sidebar{width:260px;background:var(--bg);color:#cbd5e1;display:flex;flex-direction:column;flex-shrink:0;position:sticky;top:0;height:100vh;transition:width .18s ease}.sidebar.collapsed{width:68px}.nav-scroll{flex:1;overflow-y:auto;overflow-x:hidden;padding-bottom:12px}.sidebar.collapsed .nav-scroll{overflow:visible}.sidebar .brand{padding:16px 18px;color:#fff;border-bottom:1px solid #1e293b;display:flex;align-items:center;gap:12px;min-height:64px}.brand-logo{width:36px;height:36px;flex-shrink:0;border-radius:9px;background:var(--primary);color:#fff;font-weight:800;font-size:16px;display:flex;align-items:center;justify-content:center;letter-spacing:.5px}.brand-text{font-size:18px;font-weight:700;line-height:1.15;letter-spacing:.5px;overflow:hidden;white-space:nowrap}.brand-text small{display:block;font-size:11px;color:#cbd5e1;font-weight:300;margin-top:3px}.sidebar.collapsed .brand{justify-content:center;padding:16px 0}.sidebar.collapsed .brand-text{display:none}.nav-group{padding:8px 0}.nav-group-title{padding:12px 18px 6px;font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:#64748b}.nav-item{display:flex;align-items:center;gap:12px;padding:9px 18px;color:#cbd5e1;font-size:13.5px;border-left:3px solid transparent;position:relative;white-space:nowrap}.nav-item.child{padding-left:26px}.nav-item 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