.card {
    border: 1px solid #ddd;
    border-radius: 8px;
    transition: box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.card-header {
    border-bottom: 1px solid #ddd;
}

/* Button Styling */
.btn-primary {
    background-color: #007bff;
    border-color: #007bff;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 5px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary:hover {
    background-color: #0056b3;
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.2);
}

/* Results Display Styling */
#conversion-result {
    background-color: #f9f9f9;
    padding: 20px;
    border: 1px solid #e3e3e3;
    border-radius: 8px;
    margin-top: 20px;
}

/* Error Message Styling */
.alert-danger {
    border: 1px solid #e3342f;
    background-color: #f8d7da;
    color: #721c24;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .btn-primary {
        font-size: 14px;
        padding: 8px 16px;
    }
}