* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #2c3e50;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

label {
    font-weight: 500;
}

input[type="number"] {
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    width: 100px;
}

.radio-group {
    display: flex;
    gap: 2rem;
}

.button-group {
    display: flex;
    gap: 1rem;
}

button {
    padding: 0.8rem 1.5rem;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

#copy {
    background-color: #2ecc71;
}

#copy:hover {
    background-color: #27ae60;
}

.output {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 4px;
    min-height: 200px;
}

#result {
    white-space: pre-wrap;
}