body {
    font-family: 'Poppins', sans-serif;
    height: 100vh;
    background: linear-gradient(135deg, #2c3e50, #34495e);
    display: flex;
    justify-content: center;
    align-items: center;
    color: #fff;
    margin: 0;
}

.app-container {
    background: rgba(42, 40, 40, 0.7);
    padding: 40px 50px;
    border-radius: 20px;
    text-align: center;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

input {
    padding: 12px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    text-align: center;
    outline: none;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    width: 100%;
    margin-bottom: 15px;
}

button {
    padding: 12px;
    width: 100%;
    background: #fff;
    color: #764ba2;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: 0.3s ease;
    font-size: 16px;
}

button:hover {
    background: #764ba2;
    color: #fff;
    transform: scale(1.05);
}

pre {
    margin-top: 20px;
    font-size: 1.2rem;
    font-weight: 600;
    white-space: pre-line;
}