:root {
    --primary-color: #2563eb;
    --secondary-color: #f59e0b;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --warning-color: #f59e0b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* Responsive Navigation */
@media (max-width: 768px) {
    .mobile-menu {
        display: block;
    }
    
    .desktop-nav {
        display: none;
    }
}

/* Print Styles */
@media print {
    body * {
        visibility: hidden;
    }
    
    .print-area, .print-area * {
        visibility: visible;
    }
    
    .print-area {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
    }
    
    .no-print {
        display: none !important;
    }
}

.alert-red {
    background-color: #fee2e2;
    color: #991b1b;
    border-color: #ef4444;
}

.alert-yellow {
    background-color: #fef3c7;
    color: #92400e;
    border-color: #f59e0b;
}

.alert-green {
    background-color: #d1fae5;
    color: #065f46;
    border-color: #10b981;
}

.modal-overlay {
    background-color: rgba(0, 0, 0, 0.5);
}