/* CSS Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Ensure the hidden attribute always wins, even over flex/grid display rules */
[hidden] {
    display: none !important;
}

:root {
    /* Colors */
    --color-bg: #f7f8fc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-border-focus: #4a5568;
    --color-text-primary: #1a202c;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    --color-accent: #2d3748;
    --color-accent-hover: #1a202c;
    --color-error: #c53030;
    --color-error-bg: #fff5f5;
    --color-success: #276749;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Consolas', monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* App Container */
.app-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.app-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.privacy-statement {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    max-width: 500px;
    margin: 0 auto;
}

/* Main Content - Grid Layout */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* Form Section */
.form-section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
}

.form-section-group {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.form-section-group:last-of-type {
    margin-bottom: 0;
}

.form-section-group legend {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-primary);
    padding: 0 var(--spacing-sm);
    margin-left: calc(-1 * var(--spacing-sm));
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.form-row:last-child {
    margin-bottom: 0;
}

.form-row .form-group {
    margin-bottom: 0;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.required {
    color: var(--color-error);
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-family);
    font-size: 0.9375rem;
    color: var(--color-text-primary);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px rgba(45, 55, 72, 0.1);
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

input::placeholder,
textarea::placeholder {
    color: var(--color-text-muted);
}

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
    border-color: var(--color-error);
    background-color: var(--color-error-bg);
}

input[aria-invalid="true"]:focus,
select[aria-invalid="true"]:focus,
textarea[aria-invalid="true"]:focus {
    box-shadow: 0 0 0 3px rgba(197, 48, 48, 0.15);
}

textarea {
    resize: vertical;
    min-height: 60px;
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%234a5568' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    padding-right: var(--spacing-xl);
}

/* Error Messages */
.error-message {
    display: block;
    font-size: 0.8125rem;
    color: var(--color-error);
    margin-top: var(--spacing-xs);
    min-height: 1.25rem;
}

.error-message:empty {
    display: none;
}

/* Logo Upload */
.logo-upload-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

input[type="file"] {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    cursor: pointer;
}

input[type="file"]::file-selector-button {
    font-family: var(--font-family);
    font-size: 0.875rem;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
    margin-right: var(--spacing-md);
}

input[type="file"]::file-selector-button:hover {
    background-color: var(--color-border);
}

.help-text {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.logo-preview {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
}

.logo-preview img {
    max-width: 120px;
    max-height: 60px;
    object-fit: contain;
}

.btn-remove-logo {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1.25rem;
    line-height: 1;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-remove-logo:hover {
    background: var(--color-error-bg);
    border-color: var(--color-error);
    color: var(--color-error);
}

/* Items Container */
.items-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.item-row {
    display: grid;
    grid-template-columns: 2fr 0.75fr 1fr 1fr auto;
    gap: var(--spacing-sm);
    align-items: start;
    padding: var(--spacing-md);
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    animation: itemSlideIn var(--transition-normal);
}

@keyframes itemSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.item-row.removing {
    animation: itemSlideOut var(--transition-fast) forwards;
}

@keyframes itemSlideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(-20px);
    }
}

.item-row input {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
}

.item-description {
    grid-column: 1;
}

.item-qty {
    grid-column: 2;
    text-align: center;
}

.item-rate {
    grid-column: 3;
}

.item-amount {
    grid-column: 4;
    font-family: var(--font-family-mono);
    font-size: 0.875rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-surface);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    text-align: right;
    min-width: 80px;
}

.btn-remove-item {
    grid-column: 5;
    padding: var(--spacing-xs);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    transition: all var(--transition-fast);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove-item:hover {
    background: var(--color-error-bg);
    color: var(--color-error);
}

.btn-add-item {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-add-item:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: var(--color-surface);
}

/* Form Actions */
.form-actions {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.btn-primary {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-accent);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    color: #ffffff;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    background-color: var(--color-text-muted);
    cursor: not-allowed;
    transform: none;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Preview Section */
.preview-section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: var(--spacing-lg);
    max-height: calc(100vh - var(--spacing-xl) * 2);
}

.preview-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg);
}

.preview-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.invoice-preview {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    background: var(--color-bg);
}

/* Invoice Document Styles */
.invoice-document {
    background: #ffffff;
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
    min-height: 842px;
    max-width: 595px;
    margin: 0 auto;
    box-shadow: var(--shadow-sm);
    font-size: 0.875rem;
}

.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-text-primary);
}

.invoice-brand {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.preview-logo {
    flex-shrink: 0;
}

.preview-logo img {
    max-width: 80px;
    max-height: 60px;
    object-fit: contain;
}

.business-info {
    flex: 1;
}

.business-name {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.business-details {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.business-details div {
    margin-bottom: 2px;
}

.invoice-title-block {
    text-align: right;
}

.invoice-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-md);
}

.invoice-meta {
    font-size: 0.8125rem;
}

.meta-row {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.meta-label {
    color: var(--color-text-muted);
}

.meta-value {
    font-weight: 500;
    color: var(--color-text-primary);
    font-family: var(--font-family-mono);
}

/* Bill To */
.invoice-billto {
    margin-bottom: var(--spacing-xl);
}

.billto-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.client-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.client-details {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.client-details div {
    margin-bottom: 2px;
}

/* Items Table */
.invoice-items-wrapper {
    margin-bottom: var(--spacing-lg);
    overflow-x: auto;
}

.invoice-items-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    table-layout: fixed;
}

.invoice-items-table th.col-description,
.invoice-items-table td.col-description {
    width: 46%;
    word-break: break-word;
    overflow-wrap: break-word;
}

.invoice-items-table th.col-qty,
.invoice-items-table td.col-qty {
    width: 14%;
}

.invoice-items-table th.col-rate,
.invoice-items-table td.col-rate {
    width: 20%;
}

.invoice-items-table th.col-amount,
.invoice-items-table td.col-amount {
    width: 20%;
}

.invoice-items-table th {
    text-align: left;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg);
    font-weight: 600;
    color: var(--color-text-secondary);
    border-bottom: 2px solid var(--color-border);
}

.invoice-items-table th.col-qty,
.invoice-items-table th.col-rate,
.invoice-items-table th.col-amount {
    text-align: right;
}

.invoice-items-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.invoice-items-table td.col-qty,
.invoice-items-table td.col-rate,
.invoice-items-table td.col-amount {
    text-align: right;
    font-family: var(--font-family-mono);
}

.invoice-items-table td.col-amount {
    font-weight: 500;
}

.invoice-items-table .empty-items td {
    text-align: center;
    color: var(--color-text-muted);
    font-style: italic;
    padding: var(--spacing-lg);
}

/* Totals */
.invoice-totals {
    margin-left: auto;
    max-width: 250px;
    margin-bottom: var(--spacing-xl);
}

.totals-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    font-size: 0.875rem;
}

.totals-label {
    color: var(--color-text-secondary);
}

.totals-value {
    font-family: var(--font-family-mono);
    font-weight: 500;
    color: var(--color-text-primary);
}

.totals-grand {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 2px solid var(--color-text-primary);
    font-size: 1rem;
}

.totals-grand .totals-label {
    font-weight: 600;
    color: var(--color-text-primary);
}

.totals-grand .totals-value {
    font-size: 1.125rem;
    font-weight: 700;
}

/* Notes */
.invoice-notes {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.invoice-notes h4 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.invoice-notes p {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    white-space: pre-wrap;
}

/* Visually Hidden */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Responsive - Tablet */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-lg);
    }

    .item-row {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }

    .item-description {
        grid-column: 1 / -1;
    }

    .item-qty,
    .item-rate,
    .item-amount {
        grid-column: span 1;
    }

    .btn-remove-item {
        grid-column: span 1;
        justify-self: end;
    }
}

/* Responsive - Mobile */
@media (max-width: 900px) {
    .app-container {
        padding: var(--spacing-md);
    }

    .main-content {
        grid-template-columns: 1fr;
    }

    .preview-section {
        position: static;
        max-height: none;
        order: -1;
    }

    .invoice-preview {
        max-height: 400px;
    }

    .form-section-group {
        padding: var(--spacing-md);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .item-row {
        grid-template-columns: 1fr 1fr auto;
    }

    .item-description {
        grid-column: 1 / -1;
    }

    .invoice-header {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .invoice-title-block {
        text-align: left;
    }

    .meta-row {
        justify-content: flex-start;
    }
}

@media (max-width: 480px) {
    .app-header h1 {
        font-size: 1.5rem;
    }

    .invoice-document {
        padding: var(--spacing-md);
    }

    .item-row {
        grid-template-columns: 1fr 1fr;
    }

    .item-amount {
        grid-column: 1 / -1;
    }

    .invoice-items-table th,
    .invoice-items-table td {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.75rem;
    }
}

/* Print Styles for PDF */
@media print {
    body {
        background: white;
    }

    .app-container,
    .main-content,
    .preview-section,
    .invoice-preview {
        display: block;
        padding: 0;
        margin: 0;
        max-height: none;
        overflow: visible;
        box-shadow: none;
        border: none;
    }

    .invoice-document {
        box-shadow: none;
        border: none;
        max-width: none;
        min-height: auto;
    }
}

/* ============================================== */
/* Optional Tag (Inline label on form legends) */
/* ============================================== */
.optional-tag {
    display: inline-block;
    margin-left: 0.4rem;
    padding: 0.05rem 0.4rem;
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    vertical-align: middle;
}

/* ============================================== */
/* Segmented Control (Discount Type) */
/* ============================================== */
.discount-control {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xs);
}

.segmented-control {
    display: inline-flex;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 3px;
    gap: 2px;
}

.segmented-option {
    appearance: none;
    -webkit-appearance: none;
    border: none;
    background: transparent;
    padding: 0.4rem 0.9rem;
    font-family: var(--font-family);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: calc(var(--radius-md) - 2px);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
    line-height: 1;
}

.segmented-option:hover:not(.active) {
    color: var(--color-text-primary);
    background: rgba(0, 0, 0, 0.04);
}

.segmented-option.active {
    background: var(--color-surface);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);
}

.segmented-option:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.discount-value-wrap {
    position: relative;
    display: flex;
    align-items: center;
    flex: 1;
    min-width: 0;
}

.discount-prefix,
.discount-suffix {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-family-mono);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    pointer-events: none;
}

.discount-prefix {
    left: 0.85rem;
}

.discount-suffix {
    right: 0.85rem;
}

.discount-value-wrap input {
    width: 100%;
    padding-left: 1.9rem;
    font-family: var(--font-family-mono);
    font-size: 0.9375rem;
}

.discount-value-wrap input:has(+ .discount-suffix:not([hidden])) {
    padding-right: 2.1rem;
    padding-left: 0.9rem;
    text-align: right;
}

/* ============================================== */
/* Invoice: Parties Row (Bill To + Ship To) */
/* ============================================== */
.invoice-parties-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.invoice-billto,
.invoice-shipto {
    min-width: 0;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* ============================================== */
/* Invoice: Totals (Amount Paid + Balance Due) */
/* ============================================== */
.totals-divider {
    border-top: 2px solid var(--color-text-primary);
    margin: var(--spacing-sm) 0;
}

.totals-row.totals-paid .totals-value {
    color: var(--color-success);
}

.totals-row.totals-balance {
    padding: var(--spacing-sm) 0;
    background: var(--color-bg);
    margin: 0 calc(-1 * var(--spacing-md));
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
    border-radius: var(--radius-sm);
}

.totals-row.totals-balance .totals-label {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.totals-row.totals-balance .totals-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    font-family: var(--font-family);
}

.totals-row.totals-grand {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
    font-size: 1rem;
}

.totals-row.totals-grand .totals-label {
    font-weight: 600;
    color: var(--color-text-primary);
}

.totals-row.totals-grand .totals-value {
    font-size: 1.125rem;
    font-weight: 700;
}

/* ============================================== */
/* Invoice: Terms block (preview) */
/* ============================================== */
.invoice-terms {
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.invoice-terms h4 {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.invoice-terms p {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* ============================================== */
/* Responsive: Stack parties on mobile */
/* ============================================== */
@media (max-width: 900px) {
    .invoice-parties-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .totals-row.totals-balance {
        margin: 0;
    }
}

@media (max-width: 480px) {
    .discount-control {
        flex-direction: column;
        align-items: stretch;
    }

    .segmented-control {
        align-self: flex-start;
    }

    .totals-row.totals-balance .totals-value {
        font-size: 1.125rem;
    }
}