body {
    background: #0f0f0f;
    color: #e6e6e6;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.container {
    width: 600px;
    margin: 40px auto;
}

h1 {
    text-align: center;
    margin-bottom: 30px;
}

.card {
    background: #1a1a1a;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #333;
}

label {
    display: block;
    margin-bottom: 10px;
}

select, button {
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    border-radius: 6px;
    border: none;
    font-size: 16px;
}

button {
    background: #0078ff;
    color: white;
    cursor: pointer;
    transition: 0.2s;
}

button:hover {
    background: #005fcc;
}

.output pre {
    background: #111;
    padding: 15px;
    border-radius: 6px;
    white-space: pre-wrap;
}

.export {
    background: #00b33c;
    font-weight: bold;
}