body {
    font-family: Arial, sans-serif;
    background: #0f172a;
    color: white;
    text-align: center;
    padding-top: 100px;
}

.container {
    background: #1e293b;
    padding: 30px;
    border-radius: 10px;
    width: 400px;
    margin: auto;
}

input {
    width: 80%;
    padding: 10px;
    margin-top: 20px;
    border-radius: 5px;
    border: none;
}

button {
    margin-top: 15px;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    background: #22c55e;
    color: white;
    cursor: pointer;
}

#result {
    margin-top: 20px;
    font-weight: bold;
}
#explanation {
    margin-top: 10px;
    font-size: 14px;
    color: #cbd5e1;
}