* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background: #f2f2f2;
    margin: 0;
    padding: 0;
}

.container {
    width: 450px;
    max-width: 95%;
    margin: 40px auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
}

/* Table styling */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 15px;
}

th, td {
    border: 1px solid #ccc;
    padding: 6px;
    text-align: center;
    font-size: 14px;
}

/* Inputs */
input {
    width: 100%;
    padding: 6px;
    font-size: 14px;
}

/* Button */
button {
    width: 100%;
    padding: 12px;
    background: #007bff;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #0056b3;
}

/* Result text */
#result {
    text-align: center;
    font-size: 18px;
    margin-top: 10px;
}

/* 📱 Mobile Optimization */
@media (max-width: 600px) {

    .container {
        padding: 15px;
    }

    h2 {
        text-align: center;
        font-size: 20px;
    }

    th, td {
        font-size: 12px;
        padding: 4px;
    }

    input {
        font-size: 13px;
        padding: 5px;
    }

    button {
        font-size: 15px;
        padding: 10px;
    }
}