body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(to top right, #e0f7fa, #e1f5fe);
    margin: 0;
    padding: 20px;
    color: #01579b;
}

h1 {
    text-align: center;
    color: #0277bd;
    margin-bottom: 40px;
}

.section {
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

label {
    display: block;
    margin: 15px 0 5px;
    font-weight: 600;
}

select, input[type="number"] {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #b3e5fc;
    background: #e1f5fe;
    font-size: 16px;
}

#extras label {
    display: block;
    margin: 8px 0;
    font-size: 15px;
}

button {
    background-color: #0288d1;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
    width: 100%;
    margin-top: 15px;
}

button:hover {
    background-color: #0277bd;
}

.total {
    font-size: 20px;
    text-align: center;
    margin-top: 15px;
    font-weight: bold;
}

mark {
    background-color: #b3e5fc;
    padding: 2px 5px;
    border-radius: 5px;
}

.right-bar {
    text-align: center;
    margin-top: 30px;
}

.right-bar h4 {
    color: #0288d1;
    margin: 0;
    font-weight: bold;
}

a {
    text-decoration: none;
}