* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: #f4f5f7;
    color: #222;
}

header {
    background: #ffffff;
    border-bottom: 1px solid #ddd;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
}

nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

nav a {
    color: #1f2937;
    text-decoration: none;
    padding: 8px 10px;
    border-radius: 6px;
}

nav a:hover {
    background: #eef2f7;
}

main {
    max-width: 1200px;
    margin: 24px auto;
    padding: 0 24px;
}

h2 {
    margin-top: 0;
    margin-bottom: 16px;
}

a {
    color: #2563eb;
}

button {
    border: 0;
    background: #2563eb;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
}

button:hover {
    background: #1d4ed8;
}

input,
select,
textarea {
    width: 100%;
    max-width: 420px;
    padding: 8px 10px;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    background: white;
}

textarea {
    max-width: 700px;
}

form {
    margin: 0;
}

main form {
    margin-bottom: 12px;
}

label {
    font-weight: 600;
}

p {
    margin: 8px 0;
}

details {
    background: #ffffff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 12px;
    margin: 12px 0;
}

summary {
    cursor: pointer;
    font-weight: 600;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
}

th,
td {
    padding: 10px;
    border-bottom: 1px solid #eee;
    text-align: left;
    vertical-align: top;
}

th {
    background: #f8fafc;
    font-weight: 700;
}

tr:last-child td {
    border-bottom: 0;
}

td form {
    margin-bottom: 8px;
}

hr {
    border: 0;
    border-top: 1px solid #ddd;
    margin: 20px 0;
}

nav {
    margin-right: auto;
}

header button {
    background: #ef4444;
}

header button:hover {
    background: #dc2626;
}

.form-errors,
.form-error {
    display: block;
    margin-top: 4px;
    color: #b91c1c;
    font-size: 13px;
    font-weight: 600;
}

.form-field-error input,
.form-field-error select,
.form-field-error textarea {
    border-color: #b91c1c;
}

.token-box {
    margin: 12px 0;
    padding: 12px;
    border: 1px solid #bfdbfe;
    background: #eff6ff;
    border-radius: 8px;
}

.token-box input {
    width: 100%;
    max-width: 760px;
}

.header-user {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-username {
    color: #334155;
    font-size: 14px;
    font-weight: 600;
}

.profile-icon-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    color: #334155;
    background: #f1f5f9;
    border-radius: 999px;
    text-decoration: none;
}

.profile-icon-link:hover {
    background: #e2e8f0;
    color: #0f172a;
}

.profile-icon {
    width: 19px;
    height: 19px;
    fill: currentColor;
}

.customer-lookup-box {
    margin: 14px 0 18px;
    padding: 14px;
    border: 1px solid #dbe3ef;
    background: #f8fafc;
    border-radius: 10px;
}

.customer-lookup-box h3 {
    margin-top: 0;
}

.customer-lookup-grid {
    display: grid;
    grid-template-columns: minmax(220px, 320px) minmax(260px, 420px);
    gap: 14px;
    align-items: end;
}

.customer-vat-id-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.customer-vat-id-row input {
    flex: 1;
}

.customer-lookup-error {
    margin: 8px 0 0;
    color: #b91c1c;
    font-weight: 600;
}

@media (max-width: 760px) {
    .customer-lookup-grid {
        grid-template-columns: 1fr;
    }

    .customer-vat-id-row {
        align-items: stretch;
        flex-direction: column;
    }
}

.customer-entry-options {
    display: grid;
    grid-template-columns: minmax(280px, 1.2fr) minmax(240px, 0.8fr);
    gap: 14px;
    margin: 14px 0 18px;
}

.customer-entry-option {
    padding: 14px;
    border: 1px solid #dbe3ef;
    background: #f8fafc;
    border-radius: 10px;
}

.customer-entry-option h3 {
    margin-top: 0;
}

.customer-lookup-grid {
    display: grid;
    grid-template-columns: minmax(180px, 260px) minmax(240px, 1fr);
    gap: 14px;
    align-items: end;
}

.customer-vat-id-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.customer-vat-id-row input {
    flex: 1;
}

.customer-lookup-error {
    margin: 8px 0 0;
    color: #b91c1c;
    font-weight: 600;
}

@media (max-width: 820px) {
    .customer-entry-options,
    .customer-lookup-grid {
        grid-template-columns: 1fr;
    }

    .customer-vat-id-row {
        align-items: stretch;
        flex-direction: column;
    }
}