body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #222;
    color: #eee;
    margin: 0;
}

.container {
    background-color: #4a4a4a;
    padding: 20px 40px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 900px;
    text-align: center;
}

.header-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.header-logo-img {
    height: 150px;
    margin-right: 10px;
}

.category-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 20px;
}

.category {
    background-color: #5a5a5a;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #4d4d4d;
    flex: 1;
}

.category h2 {
    color: #ff0000;
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 20px;
}

.tuning-option {
    display: flex;
    align-items: center;
    gap: 30px;
    margin-bottom: 15px;
    padding: 10px 15px;
    background-color: #6e6e6e;
    border-radius: 5px;
}

label {
    text-align: left;
    flex-grow: 1;
    flex-shrink: 0;
}

select, input[type="number"] {
    width: 100px;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #4d4d4d;
    background-color: #6e6e6e;
    color: #eee;
    text-align: center;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    box-sizing: border-box;
    height: 36px;
}

/* Hide spinner arrows for input type="number" */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
input[type="number"] {
    -moz-appearance: textfield;
}


input[type="checkbox"] {
    width: 20px;
    height: 20px;
    flex: none;
    vertical-align: middle;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    border: 1px solid #4d4d4d;
    background-color: #6e6e6e;
    cursor: pointer;
    border-radius: 4px;
    position: relative;
    top: 0;
}

input[type="checkbox"]:checked {
    background-color: #ff0000;
    border-color: #ff0000;
}

input[type="checkbox"]:checked::after {
    content: '✔';
    display: block;
    color: #eee;
    font-size: 14px;
    line-height: 18px;
    text-align: center;
}

button {
    background-color: #ff0000;
    color: #eee;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 20px;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #cc0000;
}

#result {
    margin-top: 10px;
    padding-top: 20px;
    border-top: 1px solid #4d4d4d;
}

#total-price {
    font-size: 24px;
    color: #ff0000;
    font-weight: bold;
}