body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #1a1a1a;
    color: #fff;
    display: flex;
    justify-content: center;
    padding: 2rem;
}
.container {
    max-width: 600px;
    width: 100%;
    background: #2a2a2a;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
}
textarea, input {
    width: 100%;
    margin-bottom: 1rem;
    padding: 0.5rem;
    border-radius: 6px;
    border: none;
    background-color: #3a3a3a;
    color: #fff;
}
button {
    background-color: #4caf50;
    color: white;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
}
button:hover {
    background-color: #45a049;
}
pre {
    background-color: #000;
    padding: 1rem;
    border-radius: 8px;
    max-height: 300px;
    overflow-y: auto;
}