.result-box {
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid #dee2e6;
    border-radius: 0.375rem;
    padding: 1rem;
    background-color: #f8f9fa;
    font-family: 'Courier New', monospace;
    white-space: pre-wrap;
    word-break: break-all;
}
.permutation-item {
    padding: 0.25rem 0.5rem;
    margin: 0.125rem;
    border-radius: 0.25rem;
    background-color: #e9ecef;
    display: inline-block;
    font-family: 'Courier New', monospace;
}
.permutation-count {
    font-size: 1.2rem;
    font-weight: bold;
    /*color: #0d6efd;*/
}
.option-section {
    background-color: #f8f9fa;
    border-radius: 0.375rem;
    padding: 1rem;
    margin-bottom: 1rem;
}
.btn-group-custom .btn {
    border-radius: 0.25rem !important;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}
.highlight {
    background-color: #fff3cd;
    border-left: 4px solid #ffc107;
}
.input-group-custom .form-control {
    border-top-right-radius: 0.25rem;
    border-bottom-right-radius: 0.25rem;
}
.input-group-custom .input-group-text {
    border-top-left-radius: 0.25rem;
    border-bottom-left-radius: 0.25rem;
}
.factorial-info {
    font-size: 0.9rem;
    color: #6c757d;
}
.formula-box {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 0.375rem;
    padding: 1rem;
    margin-bottom: 1rem;
    font-family: 'Courier New', monospace;
}
.formula {
    color: #0d6efd;
    font-weight: bold;
}
.warning-highlight {
    background-color: #f8d7da;
    border-left: 4px solid #dc3545;
}