:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
}

.navbar-dark {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2980b9 100%) !important;
}

.card {
    border-radius: 10px;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-success {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

.table-hover tbody tr:hover {
    background-color: rgba(52, 152, 219, 0.05);
}