/* ==========================================================================
   INVOICE GENERATOR & STORAGE SYSTEM - STYLESHEET
   Clean, Minimal, Professional Design (HTML5 / CSS3)
   ========================================================================== */

:root {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --border-focus: #3b82f6;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --secondary: #475569;
    --secondary-hover: #334155;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --danger-light: #fef2f2;
    --success: #16a34a;
    --success-hover: #15803d;
    --success-light: #f0fdf4;
    --warning: #d97706;
    --warning-light: #fffbeb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --radius-sm: 4px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
    background-color: #0f172a;
    color: #ffffff;
    padding: 0.85rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.nav-brand svg {
    width: 22px;
    height: 22px;
    fill: currentColor;
    color: #60a5fa;
}

.nav-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.nav-link {
    color: #cbd5e1;
    text-decoration: none;
    padding: 0.5rem 0.85rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.nav-link:hover, .nav-link.active {
    color: #ffffff;
    background-color: #1e293b;
}

.nav-btn {
    background-color: var(--primary);
    color: #ffffff !important;
}

.nav-btn:hover {
    background-color: var(--primary-hover) !important;
}

/* ==========================================================================
   Container & Layouts
   ========================================================================== */
.container {
    max-width: 1300px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.75rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.page-subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

/* Builder Layout (Form on Left, Live Preview on Right) */
.builder-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 1024px) {
    .builder-layout {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   Cards & Panels
   ========================================================================== */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sticky-preview {
    position: sticky;
    top: 5rem;
}

/* ==========================================================================
   Form Controls
   ========================================================================== */
.form-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-grid-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 640px) {
    .form-grid-2, .form-grid-3 {
        grid-template-columns: 1fr;
    }
}

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

.form-group label {
    display: block;
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.35rem;
}

.form-control {
    width: 100%;
    padding: 0.55rem 0.75rem;
    font-size: 0.875rem;
    color: var(--text-main);
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

textarea.form-control {
    resize: vertical;
    min-height: 65px;
}

.form-help {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* File Upload Box */
.file-upload-wrapper {
    position: relative;
    border: 1px dashed var(--border-color);
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    background-color: #fbfcfd;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s;
}

.file-upload-wrapper:hover {
    border-color: var(--primary);
}

.file-upload-wrapper input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.upload-text {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================================================
   Dynamic Items Table (Form Editor)
   ========================================================================== */
.items-table-wrapper {
    overflow-x: auto;
    margin-bottom: 1rem;
}

.items-editor-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.items-editor-table th {
    background-color: #f1f5f9;
    padding: 0.6rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

.items-editor-table td {
    padding: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
}

.items-editor-table input.form-control {
    padding: 0.45rem 0.55rem;
    font-size: 0.825rem;
}

.btn-remove-item {
    background-color: transparent;
    color: var(--danger);
    border: 1px solid #fecaca;
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-remove-item:hover {
    background-color: var(--danger);
    color: #ffffff;
    border-color: var(--danger);
}

/* Calculation summary section */
.calc-summary-box {
    margin-left: auto;
    max-width: 320px;
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
}

.calc-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
}

.calc-row.grand-total {
    border-top: 2px solid var(--border-color);
    padding-top: 0.6rem;
    margin-top: 0.6rem;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--primary);
}

/* ==========================================================================
   Buttons & Actions
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.55rem 1.1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
    font-family: inherit;
}

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

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

.btn-secondary {
    background-color: #ffffff;
    color: var(--secondary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background-color: #f1f5f9;
    color: var(--text-main);
}

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

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

.btn-outline-danger {
    background-color: transparent;
    color: var(--danger);
    border-color: #fca5a5;
}

.btn-outline-danger:hover {
    background-color: var(--danger);
    color: #ffffff;
}

.btn-success {
    background-color: var(--success);
    color: #ffffff;
}

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

.btn-sm {
    padding: 0.35rem 0.65rem;
    font-size: 0.775rem;
}

.actions-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   Invoice Preview & Template (Shared between Live Preview and View Page)
   ========================================================================== */
.invoice-paper {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 2.5rem;
    color: var(--text-main);
    position: relative;
    max-width: 850px;
    margin: 0 auto;
}

.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2rem;
    border-bottom: 2px solid #f1f5f9;
    padding-bottom: 1.5rem;
}

.invoice-company-logo {
    max-height: 70px;
    max-width: 180px;
    object-fit: contain;
    margin-bottom: 0.5rem;
    display: block;
}

.invoice-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: #0f172a;
    letter-spacing: -0.02em;
    text-transform: uppercase;
}

.invoice-meta-item {
    display: flex;
    justify-content: space-between;
    gap: 1.5rem;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

.invoice-meta-label {
    color: var(--text-muted);
    font-weight: 500;
}

.invoice-meta-value {
    font-weight: 600;
    color: var(--text-main);
}

.invoice-bill-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.bill-block-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 0.25rem;
}

.bill-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.25rem;
}

.bill-info {
    font-size: 0.85rem;
    color: #475569;
    line-height: 1.45;
    white-space: pre-line;
}

/* Invoice Preview Table */
.invoice-preview-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
}

.invoice-preview-table th {
    background-color: #0f172a;
    color: #ffffff;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 0.75rem 0.85rem;
    text-align: left;
}

.invoice-preview-table th.text-right,
.invoice-preview-table td.text-right {
    text-align: right;
}

.invoice-preview-table th.text-center,
.invoice-preview-table td.text-center {
    text-align: center;
}

.invoice-preview-table td {
    padding: 0.8rem 0.85rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
    vertical-align: top;
}

.invoice-preview-table tbody tr:nth-child(even) {
    background-color: #f8fafc;
}

.item-title {
    font-weight: 600;
    color: var(--text-main);
}

.item-desc {
    font-size: 0.775rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}

/* Invoice Summary Total Table */
.invoice-summary-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 640px) {
    .invoice-bill-grid, .invoice-summary-grid {
        grid-template-columns: 1fr;
    }
}

.invoice-notes-block {
    background-color: #f8fafc;
    border-left: 3px solid var(--primary);
    padding: 0.85rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.8rem;
    color: #475569;
}

.invoice-summary-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.invoice-summary-table td {
    padding: 0.45rem 0.5rem;
}

.invoice-summary-table td:last-child {
    text-align: right;
    font-weight: 600;
}

.invoice-summary-table tr.grand-total-row td {
    border-top: 2px solid #0f172a;
    font-size: 1.1rem;
    font-weight: 700;
    color: #0f172a;
    padding-top: 0.6rem;
}

/* Payment Status Stamp/Badge */
.badge {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-paid {
    background-color: var(--success-light);
    color: var(--success);
    border: 1px solid #bbf7d0;
}

.badge-unpaid {
    background-color: var(--danger-light);
    color: var(--danger);
    border: 1px solid #fecaca;
}

.badge-partially-paid {
    background-color: var(--warning-light);
    color: var(--warning);
    border: 1px solid #fde68a;
}

.badge-draft {
    background-color: #f1f5f9;
    color: #475569;
    border: 1px solid #cbd5e1;
}

.badge-sent {
    background-color: #eff6ff;
    color: #2563eb;
    border: 1px solid #bfdbfe;
}

.badge-accepted {
    background-color: var(--success-light);
    color: var(--success);
    border: 1px solid #bbf7d0;
}

.badge-declined {
    background-color: var(--danger-light);
    color: var(--danger);
    border: 1px solid #fecaca;
}

.badge-converted {
    background-color: #fdf4ff;
    color: #a855f7;
    border: 1px solid #f0abfc;
}

/* ==========================================================================
   Dashboard Table & Search
   ========================================================================== */
.dashboard-filter-card {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.filter-form {
    display: grid;
    grid-template-columns: 2fr 1.2fr 1fr 1fr auto;
    gap: 0.85rem;
    align-items: end;
}

@media (max-width: 900px) {
    .filter-form {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 550px) {
    .filter-form {
        grid-template-columns: 1fr;
    }
}

.data-table-wrapper {
    overflow-x: auto;
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.875rem;
}

.data-table th {
    background-color: #f8fafc;
    padding: 0.85rem 1rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.data-table td {
    padding: 0.9rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    vertical-align: middle;
}

.data-table tbody tr:hover {
    background-color: #fbfcfd;
}

.table-actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    white-space: nowrap;
}

/* ==========================================================================
   Alerts & Notifications
   ========================================================================== */
.alert {
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.25rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.alert-success {
    background-color: var(--success-light);
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-danger {
    background-color: var(--danger-light);
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* ==========================================================================
   Empty State Card
   ========================================================================== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background-color: #ffffff;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius);
}

.empty-state-icon {
    width: 54px;
    height: 54px;
    margin: 0 auto 1rem;
    color: #94a3b8;
}

.empty-state-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.4rem;
}

.empty-state-desc {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 1.25rem;
}

/* ==========================================================================
   PRINT STYLES (@media print)
   Flawless A4 output without extra UI elements
   ========================================================================== */
@media print {
    body {
        background-color: #ffffff !important;
        color: #000000 !important;
        font-size: 12pt;
    }

    .navbar,
    .page-header,
    .actions-bar,
    .no-print,
    .dashboard-filter-card,
    .alert,
    button,
    .btn,
    .builder-layout > .form-column {
        display: none !important;
    }

    .container {
        max-width: 100% !important;
        margin: 0 !important;
        padding: 0 !important;
    }

    .builder-layout {
        display: block !important;
    }

    .sticky-preview {
        position: static !important;
    }

    .invoice-paper {
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
        max-width: 100% !important;
    }

    .invoice-preview-table th {
        background-color: #1e293b !important;
        color: #ffffff !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    .badge {
        border: 1px solid #000 !important;
        color: #000 !important;
        background: transparent !important;
    }
}