body {
    background: #f5f5f8;
    font-family: 'Segoe UI', Arial, sans-serif;
}
.container {
    max-width: 720px;
    margin: 48px auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 32px #0002;
    padding: 32px;
}
h2 {
    color: #23455f;
    margin-bottom: 16px;
    font-weight: bold;
}
form label {
    display: block;
    margin: 10px 0 4px 0;
    font-weight: 500;
    color: #23455f;
}
input, select {
    width: 100%;
    padding: 8px;
    margin-bottom: 14px;
    border: 1px solid #bbb;
    border-radius: 4px;
}
.add-row-group {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap; /* allows line break */
}
.add-row-group select,
.add-row-group input,
.add-row-group button {
    flex: 1 1 auto;
    min-width: 120px;
    margin-bottom: 0;
}
.removeRowBtn {
    background: #e87e7e;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
}
button {
    background: #23455f;
    color: white;
    padding: 10px 18px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    margin-right: 6px;
}
button:disabled {
    background: #bbb;
    cursor: default;
}
.invoice {
    margin-top: 32px;
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 1px 4px #0001;
}
.invoice h3 {
    margin: 0;
    color: #23455f;
    font-size: 1.25em;
    font-weight: bold;
}
.invoice strong {
    font-weight: 700;
}
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
    margin-bottom: 0;
}
.table th, .table td {
    padding: 10px 12px;
    border: 1px solid #ccc;
    text-align: center;
    font-size: 1em;
}
.table th {
    background: #e8ded0;
    color: #23455f;
    font-weight: bold;
}
.table td:last-child {
    background: #f8f2dd;
    font-weight: bold;
}
.summary {
    font-size: 1.3em;
    font-weight: bold;
    color: #c14542;
    background: #fad3d2;
    text-align: center;
    padding: 24px 0 10px 0;
    margin: 0;
    border-radius: 8px;
    box-shadow: none;
}
.summary span {
    display: inline-block;
    font-size: 2em;
    background: #e87e7e22;
    padding: 0 20px;
    border-radius: 8px;
    font-family: serif;
    margin-top: 6px;
}
/* Responsive layout for small screens below 600px */
@media (max-width: 600px) {
    .add-row-group {
        flex-direction: column;
        align-items: stretch;
    }
    .add-row-group select,
    .add-row-group input,
    .add-row-group button {
        width: 100%;
        min-width: unset;
        margin-bottom: 8px;
    }
    .add-row-group button {
        margin-bottom: 0;
    }
}
@media print {
    body * {
        visibility: hidden;
    }
    #invoice, #invoice * {
        visibility: visible;
    }
    #invoice {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        margin: 0;
        padding: 0;
        box-shadow: none;
    }
}