:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --light-bg: #ecf0f1;
}

body {
    background-color: var(--light-bg);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 10px 10px 0 0 !important;
    border: none;
}

.btn {
    border-radius: 6px;
    font-weight: 500;
}

.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);
}

.table {
    border-radius: 8px;
    overflow: hidden;
}

.table thead th {
    background-color: var(--primary-color);
    color: white;
    border: none;
    font-weight: 600;
}

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

.alert {
    border: none;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.form-control, .form-select {
    border-radius: 6px;
    border: 1px solid #ddd;
    padding: 0.75rem;
}

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

.dashboard-card {
    transition: transform 0.2s;
}

.dashboard-card:hover {
    transform: translateY(-2px);
}

.bg-primary {
    background: linear-gradient(135deg, var(--secondary-color), #2980b9) !important;
}

.bg-success {
    background: linear-gradient(135deg, var(--success-color), #229954) !important;
}

.bg-warning {
    background: linear-gradient(135deg, var(--warning-color), #e67e22) !important;
}

.bg-danger {
    background: linear-gradient(135deg, var(--danger-color), #c0392b) !important;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: var(--secondary-color) !important;
}

.dropdown-menu {
    border: none;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    border-radius: 8px;
}

.dropdown-item:hover {
    background-color: var(--light-bg);
}

footer {
    margin-top: auto;
}

.list-group-item {
    border: none;
    border-radius: 6px !important;
    margin-bottom: 5px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.badge {
    font-size: 0.8em;
    padding: 0.4em 0.8em;
}

/* Loading spinner */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .card-body {
        padding: 1rem;
    }
    
    .table-responsive {
        border-radius: 8px;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .btn:last-child {
        margin-bottom: 0;
    }
}

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