:root {
    --primary-teal: #007a87;
    --primary-teal-light: #e6f2f3;
    --primary-teal-dark: #005a63;
    --border-gray: #cccccc;
    --border-light: #e0e0e0;
    --text-dark: #333333;
    --text-muted: #555555;
    --bg-light: #f9f9f9;
    --white: #ffffff;
    --danger-red: #d9534f;
    --danger-red-dark: #c9302c;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --border-radius: 4px;
    --transition: all 0.2s ease-in-out;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Arial', 'Helvetica', sans-serif;
    color: var(--text-dark);
    background-color: #f0f3f4;
    line-height: 1.4;
    padding: 20px;
    display: flex;
    justify-content: center;
}

/* App Container and Grid Layout */
.app-container {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
    width: 100%;
    max-width: 1100px;
}

/* Invoice Page Styles (mimics a real paper invoice) */
.invoice-document {
    background-color: var(--white);
    padding: 40px;
    box-shadow: var(--shadow);
    border-radius: var(--border-radius);
    min-height: 297mm;
    position: relative;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
}

/* Header styling */
.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
    gap: 20px;
}

.invoice-title {
    font-size: 34px;
    color: var(--primary-teal);
    letter-spacing: 0.5px;
    margin-bottom: 10px;
    font-weight: bold;
}

.company-details h2 {
    font-size: 15px;
    color: #000000;
    margin-bottom: 3px;
    font-weight: bold;
}

.company-details p {
    font-size: 13px;
    color: #000000;
    margin-bottom: 2px;
}

/* Meta Data Table (top right) */
.invoice-meta-table {
    border: 1px solid var(--border-gray);
    width: 320px;
    border-collapse: collapse;
}

.meta-row {
    display: flex;
    border-bottom: 1px solid var(--border-gray);
}

.meta-row:last-child {
    border-bottom: none;
}

.meta-label {
    background-color: var(--primary-teal);
    color: var(--white);
    padding: 6px 12px;
    font-size: 12px;
    font-weight: bold;
    width: 130px;
    display: flex;
    align-items: center;
    vertical-align: middle;
    flex-shrink: 0;
}

.meta-value {
    flex: 1;
    display: flex;
    align-items: center;
    background-color: var(--white);
}

.meta-value input {
    width: 100%;
    border: none;
    padding: 6px 12px;
    font-size: 13px;
    outline: none;
    font-family: inherit;
    color: var(--text-dark);
}

/* Sections General */
.invoice-section {
    margin-bottom: 20px;
}

.section-title {
    font-size: 16px;
    color: var(--primary-teal);
    margin-bottom: 10px;
    font-weight: bold;
}

/* Customer Info Grid Table */
.customer-info-table {
    border: 1px solid var(--border-gray);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.info-row {
    display: flex;
    border-bottom: 1px solid var(--border-gray);
    align-items: stretch;
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    background-color: var(--primary-teal);
    color: var(--white);
    padding: 7px 12px;
    font-size: 13px;
    font-weight: bold;
    width: 30%;
    display: flex;
    align-items: center;
    vertical-align: middle;
    flex-shrink: 0;
}

.info-value {
    width: 70%;
    display: flex;
    align-items: center;
}

.info-value input {
    width: 100%;
    border: none;
    padding: 7px 12px;
    font-size: 13px;
    outline: none;
    font-family: inherit;
}

.info-value input::placeholder {
    color: #ccc;
}

/* Services Table */
.services-table-wrapper {
    border: 1px solid var(--border-gray);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 8px;
}

.services-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.services-table th {
    background-color: var(--primary-teal);
    color: var(--white);
    padding: 7px 12px;
    font-weight: bold;
    font-size: 13px;
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    vertical-align: middle;
}

.services-table th:last-child {
    border-right: none;
}

.services-table td {
    border-bottom: 1px solid var(--border-gray);
    border-right: 1px solid var(--border-gray);
    padding: 6px 12px;
    background-color: var(--white);
    vertical-align: middle;
}

.services-table tr:last-child td {
    border-bottom: none;
}

.services-table td:last-child {
    border-right: none;
}

.services-table input {
    width: 100%;
    border: none;
    padding: 4px 0;
    font-size: 13px;
    outline: none;
    font-family: inherit;
    background: transparent;
}

.services-table input.num-input {
    text-align: right;
}

.row-total-cell {
    text-align: right;
    font-weight: bold;
}

.delete-row-btn {
    background: none;
    border: none;
    color: var(--danger-red);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 13px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.delete-row-btn:hover {
    background-color: #fee2e2;
}

/* Grand Total styling */
.total-section {
    display: flex;
    justify-content: flex-end;
    margin-top: 10px;
}

.total-container {
    display: flex;
    border: 1px solid var(--border-gray);
    border-radius: var(--border-radius);
    width: 50%;
    overflow: hidden;
}

.total-label {
    background-color: var(--primary-teal);
    color: var(--white);
    padding: 8px 12px;
    font-size: 13px;
    font-weight: bold;
    width: 130px;
    display: flex;
    align-items: center;
    vertical-align: middle;
}

.total-value {
    flex: 1;
    padding: 8px 12px;
    font-size: 18px;
    font-weight: bold;
    text-align: right;
    background-color: var(--white);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    color: var(--text-dark);
}

/* Signature Section */
.signature-table {
    border: 1px solid var(--border-gray);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.sig-row {
    display: flex;
    border-bottom: 1px solid var(--border-gray);
    align-items: stretch;
}

.sig-row:last-child {
    border-bottom: none;
}

.sig-label {
    background-color: var(--primary-teal);
    color: var(--white);
    padding: 7px 12px;
    font-size: 13px;
    font-weight: bold;
    width: 30%;
    display: flex;
    align-items: center;
    vertical-align: middle;
    flex-shrink: 0;
}

.sig-value {
    width: 70%;
    display: flex;
    align-items: center;
}

.sig-value input {
    width: 100%;
    border: none;
    padding: 7px 12px;
    font-size: 13px;
    outline: none;
    font-family: inherit;
}

.canvas-container {
    position: relative;
    height: 100px;
    background-color: var(--white);
    display: flex;
    justify-content: center;
    align-items: center;
}

#signature-canvas {
    width: 100%;
    height: 100%;
    cursor: crosshair;
    display: block;
}

#clear-sig-btn {
    position: absolute;
    right: 10px;
    top: 10px;
    background-color: rgba(240, 240, 240, 0.9);
    border: 1px solid var(--border-gray);
    padding: 3px 6px;
    font-size: 10px;
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: var(--transition);
    z-index: 10;
}

#clear-sig-btn:hover {
    background-color: #e0e0e0;
}

/* Footer Section */
.invoice-footer {
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px dashed var(--border-gray);
}

.footer-cols {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.bank-details h4, .qr-details h4 {
    font-size: 12px;
    color: var(--text-dark);
    margin-bottom: 6px;
    font-weight: bold;
}

.bank-details p {
    font-size: 12px;
    color: var(--text-dark);
    margin-bottom: 2px;
}

.qr-details {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.qr-placeholder {
    padding: 6px;
    border: 1px solid var(--border-gray);
    background-color: var(--white);
    display: inline-block;
}

/* Controls Sidebar */
.controls-panel {
    background-color: var(--white);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    height: fit-content;
    position: sticky;
    top: 20px;
}

.controls-header h3 {
    font-size: 16px;
    color: var(--primary-teal);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--primary-teal-light);
    padding-bottom: 6px;
    font-weight: bold;
}

.controls-body {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: bold;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    color: var(--white);
}

.btn-sm {
    padding: 5px 10px;
    font-size: 11px;
    width: auto;
}

.btn-primary {
    background-color: var(--primary-teal);
}

.btn-primary:hover {
    background-color: var(--primary-teal-dark);
}

.btn-secondary {
    background-color: var(--bg-light);
    color: var(--text-dark);
    border: 1px solid var(--border-gray);
}

.btn-secondary:hover {
    background-color: #ededed;
}

.btn-danger {
    background-color: var(--danger-red);
}

.btn-danger:hover {
    background-color: var(--danger-red-dark);
}

.btn-success {
    background-color: #2e7d32;
}

.btn-success:hover {
    background-color: #1b5e20;
}

/* History */
.history-section {
    margin-top: 20px;
    border-top: 1px solid var(--border-light);
    padding-top: 15px;
}

.history-section h4 {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 10px;
    font-weight: bold;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 200px;
    overflow-y: auto;
}

.empty-msg {
    font-size: 11px;
    color: var(--text-muted);
    font-style: italic;
}

.history-item {
    padding: 6px 10px;
    background-color: var(--bg-light);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    cursor: pointer;
    transition: var(--transition);
}

.history-item:hover {
    border-color: var(--primary-teal);
    background-color: var(--primary-teal-light);
}

.history-item-info {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-right: 8px;
}

.history-item-name {
    font-weight: bold;
}

.history-item-date {
    color: var(--text-muted);
    font-size: 10px;
}

.delete-history-btn {
    background: none;
    border: none;
    color: var(--danger-red);
    cursor: pointer;
    padding: 2px 4px;
    font-size: 11px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: #333333;
    color: var(--white);
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-size: 13px;
    z-index: 1000;
    transition: transform 0.3s ease-in-out;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* Mobile Responsive */
@media (max-width: 900px) {
    body {
        padding: 5px;
    }

    .app-container {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .controls-panel {
        position: static;
        width: 100%;
        order: -1;
        padding: 15px;
    }

    .invoice-document {
        padding: 15px;
        min-height: auto;
        width: 100%;
    }

    .invoice-header {
        flex-direction: column;
        align-items: stretch;
        margin-bottom: 15px;
    }

    .invoice-meta-table {
        width: 100%;
    }

    .info-label, .sig-label {
        width: 30%;
        font-size: 12px;
        padding: 6px 8px;
    }

    .info-value input, .sig-value input {
        padding: 6px 8px;
        font-size: 12px;
    }

    .services-table th, .services-table td {
        padding: 5px;
        font-size: 11px;
    }

    .services-table input {
        font-size: 11px;
    }

    .total-container {
        width: 100%;
    }

    .footer-cols {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .qr-details {
        align-items: flex-start;
    }
}

/* PRINT & PDF EXPORT STYLE OVERRIDES (Removes form appearance) */
.is-printing input {
    border: none !important;
    background: transparent !important;
    padding: 0 !important;
    font-size: 13px !important;
    font-family: inherit !important;
    color: #000000 !important;
    box-shadow: none !important;
    outline: none !important;
    pointer-events: none !important;
}

.is-printing .meta-value input {
    padding-left: 12px !important;
}

.is-printing .info-value input {
    padding-left: 12px !important;
}

.is-printing .sig-value input {
    padding-left: 12px !important;
}

.is-printing .services-table input {
    pointer-events: none !important;
}

.is-printing .services-table input.num-input {
    text-align: right !important;
}

.is-printing .no-print {
    display: none !important;
}

@media print {
    body {
        background-color: var(--white) !important;
        padding: 0 !important;
    }

    .app-container {
        grid-template-columns: 1fr !important;
    }

    .no-print {
        display: none !important;
    }

    .invoice-document {
        box-shadow: none !important;
        padding: 0 !important;
        margin: 0 !important;
        border-radius: 0 !important;
        min-height: auto !important;
        width: 100% !important;
    }

    input {
        border: none !important;
        background: transparent !important;
        padding: 0 !important;
        font-size: 13px !important;
        font-family: inherit !important;
        color: #000000 !important;
        box-shadow: none !important;
        outline: none !important;
        pointer-events: none !important;
        appearance: none !important;
    }

    .meta-value input {
        padding-left: 12px !important;
    }

    .info-value input {
        padding-left: 12px !important;
    }

    .sig-value input {
        padding-left: 12px !important;
    }

    .services-table input {
        pointer-events: none !important;
    }

    * {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    .invoice-section {
        page-break-inside: avoid;
    }
}