:root{--primary:#2563eb;--primary-hover:#1d4ed8;--bg-color:#f3f4f6;--card-bg:#fff;--text-main:#1f2937;--text-muted:#6b7280;--border-color:#e5e7eb;--success:#22c55e;--danger:#ef4444;--warning:#f59e0b;--header-bg:#3b82f6;--header-text:#fff}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-main);font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.5}.app-container{min-height:100vh;display:flex}.sidebar{color:#fff;background-color:#1e293b;flex-direction:column;width:250px;display:flex}.sidebar-header{border-bottom:1px solid #334155;align-items:center;gap:.5rem;padding:1.5rem;font-size:1.25rem;font-weight:600;display:flex}.sidebar-nav{flex-direction:column;padding:1rem 0;display:flex}.nav-item{color:#cbd5e1;align-items:center;gap:.75rem;padding:.75rem 1.5rem;text-decoration:none;transition:all 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