:root {
    --primary: #1F6F5F;
    --secondary: #2FA084;
    --action: #6FCF97;
    --background: #EEEEEE;
    --surface: #FFFFFF;
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --border-color: #E2E8F0;
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow-y: hidden;
    /* Main body doesn't scroll, panels do */
}

/* Typography Utility */
.bold {
    font-weight: 600;
}

/* Toolbar */
.toolbar {
    background-color: var(--surface);
    padding: 1rem 2rem;
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.toolbar-brand {
    font-family: 'Playfair Display', serif;
    font-weight: 900;
    font-size: 1.5rem;
    letter-spacing: 3px;
    color: var(--primary);
}

.toolbar-actions {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--surface);
    color: var(--text-primary);
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    font-family: inherit;
    transition: all 0.2s;
}

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

.btn-primary {
    background-color: var(--action);
    color: #000;
    border-color: var(--action);
}

.btn-primary:hover {
    background-color: #5bbd86;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
}

.btn-download svg {
    flex-shrink: 0;
}

/* Workspace */
.workspace {
    display: flex;
    padding: 2rem;
    gap: 2rem;
    height: calc(100vh - 70px);
    overflow: hidden;
}

/* Editor Panel */
.editor-panel {
    width: 380px;
    flex-shrink: 0;
    height: 100%;
    overflow-y: auto;
    padding-right: 15px;
    /* space for scrollbar */
}

/* Custom Scrollbar */
.editor-panel::-webkit-scrollbar,
.preview-container::-webkit-scrollbar {
    width: 8px;
}

.editor-panel::-webkit-scrollbar-track,
.preview-container::-webkit-scrollbar-track {
    background: transparent;
}

.editor-panel::-webkit-scrollbar-thumb,
.preview-container::-webkit-scrollbar-thumb {
    background-color: #cbd5e1;
    border-radius: 4px;
}

.editor-panel::-webkit-scrollbar-thumb:hover,
.preview-container::-webkit-scrollbar-thumb:hover {
    background-color: #94a3b8;
}

.editor-section {
    background-color: var(--surface);
    border-radius: 8px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.editor-section-header {
    padding: 1rem 1.25rem;
    font-weight: 600;
    cursor: pointer;
    background-color: #f8fafc;
    border-bottom: 1px solid transparent;
    display: flex;
    gap: 0.5rem;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: background-color 0.2s;
}

.editor-section-header svg {
    flex-shrink: 0;
    color: var(--secondary);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    background-color: var(--secondary);
    color: #fff;
    border: none;
}

.btn-secondary svg {
    flex-shrink: 0;
}

.editor-section:not(.collapsed) .editor-section-header {
    border-bottom: 1px solid var(--border-color);
}

.editor-section-header:hover {
    background-color: #f1f5f9;
}

.editor-section-header::after {
    content: '▼';
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: transform 0.2s;
}

.editor-section.collapsed .editor-section-header::after {
    transform: rotate(-90deg);
}

.editor-section-body {
    padding: 1.25rem;
    display: block;
}

.editor-section.collapsed .editor-section-body {
    display: none;
}

.form-group {
    margin-bottom: 1rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    border: 1px solid var(--border-color);
    padding: 0.6rem;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
    background-color: #fff;
    color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--secondary);
    box-shadow: 0 0 0 3px rgba(47, 160, 132, 0.1);
    outline: none;
}

.currency-selector {
    display: flex;
    gap: 0.5rem;
}

.btn-currency {
    flex: 1;
    padding: 0.6rem 0;
    border: 1px solid var(--border-color);
    background-color: #fff;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.btn-currency:hover {
    background-color: #f8fafc;
    border-color: #cbd5e1;
}

.btn-currency.active {
    background-color: var(--secondary);
    color: #fff;
    border-color: var(--secondary);
}

.btn-secondary {
    background-color: #fff;
    border: 1px solid var(--action);
    color: var(--text-primary);
    padding: 0.6rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-secondary:hover {
    background-color: var(--action);
    color: #000;
}

.btn-save {
    background-color: var(--secondary);
    border: 1px solid var(--secondary);
    color: #fff;
    padding: 0.6rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-save:hover {
    background-color: var(--primary);
    border-color: var(--primary);
}

/* Editor Item Cards */
.item-card {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 1rem;
    background-color: #f8fafc;
    position: relative;
}

.item-card .form-group {
    margin-bottom: 0.75rem;
}

.item-card .row-flex {
    display: flex;
    gap: 0.75rem;
}

.item-card .row-flex .form-group {
    flex: 1;
    margin-bottom: 0;
}

.btn-delete-item {
    position: absolute;
    top: 8px;
    right: 8px;
    background: #ffe4e6;
    border: none;
    color: #e11d48;
    cursor: pointer;
    font-size: 1rem;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.btn-delete-item:hover {
    background: #fecdd3;
}

/* Preview Panel */
.preview-container {
    flex-grow: 1;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    /* Center scaling */
    overflow: hidden;
    /* No scrolling needed with scale */
}

/* Invoice Paper */
.invoice-paper {
    background-color: var(--surface);
    width: 210mm;
    /* A4 width */
    height: 297mm;
    /* A4 height fixed for scaling */
    padding: 35px 45px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    position: relative;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transform: scale(var(--preview-scale, 1));
    transform-origin: center center;
    overflow: hidden;
    font-size: 0.88rem;
}

/* Header */
.invoice-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2.5rem;
}

.company-info {
    max-width: 55%;
}

#preview-company-name {
    font-size: 1.8rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
    word-wrap: break-word;
}

#preview-company-address {
    color: var(--text-secondary);
    font-size: 0.8rem;
    line-height: 1.5;
}

.invoice-meta {
    text-align: right;
    flex-shrink: 0;
}

.invoice-title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
    line-height: 1;
}

.meta-row {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-bottom: 0.15rem;
}

.meta-row>span:last-child {
    min-width: 100px;
    text-align: right;
}

/* Billing Info */
.billing-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.billing-info h2 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 0.3rem;
    color: var(--text-primary);
}

.bill-to #preview-client-name {
    margin-bottom: 0.25rem;
}

.bill-to #preview-client-address {
    font-size: 0.8rem;
    color: var(--text-primary);
    line-height: 1.5;
    white-space: pre-wrap;
}

.payment-method {
    text-align: right;
}

.payment-method h2 {
    color: var(--text-primary);
}

.payment-method>div {
    font-size: 0.8rem;
    line-height: 1.5;
}

/* Items Table */
.items-table {
    margin-bottom: 1rem;
}

.table-header {
    display: grid;
    grid-template-columns: 30px 1fr 90px 60px 90px;
    gap: 0.75rem;
    padding-bottom: 0.4rem;
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    align-items: center;
    border-bottom: 2px solid var(--text-primary);
}

.invoice-row {
    display: grid;
    grid-template-columns: 30px 1fr 90px 60px 90px;
    gap: 0.75rem;
    padding: 0.5rem 0;
    align-items: flex-start;
}

.col-no {
    text-align: center;
    font-weight: 600;
    padding-top: 2px;
    font-size: 0.95rem;
}

.col-price,
.col-total {
    text-align: right;
    font-size: 0.95rem;
}

.col-qty {
    text-align: center;
    font-size: 0.95rem;
}

.item-name {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.15rem;
}

.item-desc {
    color: var(--text-secondary);
    font-size: 0.75rem;
    line-height: 1.3;
    white-space: pre-wrap;
}

/* Totals */
.totals-section {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1.5rem;
}

.totals-grid {
    width: 280px;
    border-top: 2px solid var(--text-primary);
    padding-top: 1rem;
}

.totals-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.grand-total {
    border-top: 2px solid var(--text-primary);
    padding-top: 1rem;
    margin-top: 0.5rem;
    font-weight: 700;
}

/* Footer */
.invoice-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-top: auto;
}

.terms {
    width: 50%;
}

.terms h2 {
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}

#preview-terms-text {
    font-size: 0.78rem;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.4;
    white-space: pre-wrap;
}

.signature-section {
    text-align: right;
    min-width: 200px;
}

.signature {
    font-family: 'Dancing Script', cursive;
    font-size: 2.4rem;
    font-weight: 600;
    line-height: 1;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.signature-name {
    font-weight: 700;
    font-size: 0.88rem;
    margin-bottom: 0.15rem;
}

.signature-title {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Mobile Responsiveness & Floating Preview */
.floating-toggle-btn {
    display: none;
    /* Hidden on desktop */
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 200;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--secondary);
    color: #fff;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(47, 160, 132, 0.4);
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, background-color 0.2s;
}

.floating-toggle-btn:hover {
    transform: scale(1.05);
    background-color: var(--primary);
}

.floating-toggle-btn:active {
    transform: scale(0.95);
}

.floating-toggle-btn svg {
    color: #fff;
    width: 24px;
    height: 24px;
}

@media (max-width: 768px) {
    body {
        overflow-y: auto;
        height: auto;
    }

    .toolbar {
        padding: 1rem;
    }

    .workspace {
        flex-direction: column;
        padding: 1rem;
        height: auto;
        overflow: visible;
        gap: 0;
    }

    .editor-panel {
        width: 100%;
        height: auto;
        overflow-y: visible;
        padding-right: 0;
    }

    .preview-container {
        display: none;
        /* Hidden by default on mobile */
    }

    .floating-toggle-btn {
        display: flex;
    }

    /* Active Mobile Preview State */
    body.mobile-preview-active {
        overflow: hidden;
        /* Prevent background scrolling */
    }

    body.mobile-preview-active .preview-container {
        display: flex;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        z-index: 150;
        background: rgba(0, 0, 0, 0.6);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        padding: 2rem;
        align-items: center;
        justify-content: center;
    }

    body.mobile-preview-active .floating-toggle-btn {
        background-color: #ef4444;
        /* Red close button */
        box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
    }

    body.mobile-preview-active .floating-toggle-btn:hover {
        background-color: #dc2626;
    }
}

/* Print Styles */
@media print {
    body {
        background-color: #fff;
        height: auto;
        overflow: visible;
    }

    .no-print,
    .toolbar,
    .editor-panel {
        display: none !important;
    }

    .workspace {
        padding: 0;
        display: block;
        height: auto;
        overflow: visible;
    }

    .preview-container {
        padding: 0;
        display: block;
        height: auto;
        overflow: visible;
    }

    .invoice-paper {
        box-shadow: none;
        width: 100%;
        padding: 0;
        min-height: auto;
    }
}