.container {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    width: 450px; margin: 0 auto;
}
.container h2 {
    text-align: center;
    color: #0056b3;
    margin-bottom: 30px;
}
.container .form-group {
    margin-bottom: 15px;
}
.container .form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
.container button {
    width: 100%;
    padding: 12px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 10px;
}
.container button:hover {
    background-color: #0056b3;
}
.container .result-box {
    margin-top: 30px;
    padding: 20px;
    background-color: #e9f7ff;
    border: 1px solid #cceeff;
    border-radius: 8px;
}
.container .result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 17px;
}
.container .result-item strong {
    color: #0056b3;
}
.container .result-item.total {
    border-top: 1px solid #cceeff;
    padding-top: 10px;
    font-weight: bold;
    font-size: 20px;
    color: #007bff;
}


@media screen and (max-width: 520px) {
    .container {
        width: calc(100% - 20px); padding: 30px 10px;
    }
}