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

.container {
    max-width: 900px;
}

h1 {
    color: #0d6efd;
    font-weight: 600;
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.btn-primary {
    background-color: #0d6efd;
    border: none;
    padding: 12px 0;
    font-weight: 500;
    border-radius: 50px;
    transition: background-color 0.3s;
}

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

.btn-primary:disabled {
    opacity: 0.7;
}

.form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.form-label {
    font-weight: 500;
}

#resultArea .card {
    background-color: #e9f0ff;
    border-left: 4px solid #0d6efd;
}

#resultArea .card-body {
    white-space: pre-wrap;
    word-wrap: break-word;
}