body {
    background-color: #f0f2f5;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
}

.navbar {
    background-color: #343a40;
    margin-bottom: 2rem;
}

.navbar-brand {
    color: #fff;
    font-weight: 700;
    font-size: 1.4em;
}

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card-header {
    background-color: #495057;
    color: #fff;
    font-weight: 600;
    border-top-left-radius: 10px !important;
    border-top-right-radius: 10px !important;
}

.btn-primary {
    background-color: #0d6efd;
    border: none;
    padding: 0.5rem 1.5rem;
}

.btn-primary:hover {
    background-color: #0b5ed7;
}

.table th {
    border-top: none;
    font-weight: 600;
}

.table td {
    vertical-align: middle;
}

.badge {
    padding: 0.5em 1em;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .table-responsive {
        border: none;
    }
    
    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }
}