:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
}

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

.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)) !important;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
}

.badge {
    font-weight: 500;
    padding: 0.35em 0.65em;
}

.table th {
    font-weight: 600;
    color: var(--primary-color);
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2980b9, var(--secondary-color));
    transform: translateY(-1px);
}

.alert {
    border: none;
    border-radius: 0.5rem;
}

/* Dashboard Cards Animation */
.card.bg-primary, .card.bg-info, .card.bg-warning, .card.bg-success {
    border-radius: 1rem;
    transition: transform 0.3s ease;
}

.card.bg-primary:hover, 
.card.bg-info:hover, 
.card.bg-warning:hover, 
.card.bg-success:hover {
    transform: translateY(-5px);
}

/* Form Styles */
.form-control:focus, .form-select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

/* DataTables Custom */
.dataTables_wrapper .dataTables_filter input {
    border: 1px solid #dee2e6;
    border-radius: 0.5rem;
    padding: 0.375rem 0.75rem;
}

.dataTables_wrapper .dataTables_length select {
    border: 1px solid #dee2e6;
    border-radius: 0.5rem;
    padding: 0.375rem 2.25rem 0.375rem 0.75rem;
}

/* Loading Spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .card-body {
        padding: 1rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .btn-group {
        display: flex;
        flex-direction: column;
    }
    
    .btn-group .btn {
        margin: 2px 0;
    }
}

/* Print styles */
@media print {
    .navbar, .btn, form {
        display: none !important;
    }
    
    .card {
        border: 1px solid #ddd;
        box-shadow: none;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #2980b9;
}