/**
 * Invoice Generator - Styles
 * toolsfordjs.com
 */

/* ============================================
   CSS Variables / Theme
   ============================================ */
:root {
    /* Colors - Dark DJ Theme */
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1a1a1a;
    --bg-card: #1a1a1a;
    --bg-card-hover: #252525;

    /* Accent Colors */
    --accent-primary: #1255DD;
    --accent-primary-hover: #0e44b1;
    --accent-secondary: #00d4ff;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #bbbbbb;
    --text-muted: #666666;

    /* Border Colors */
    --border-color: #2a2a2a;
    --border-color-light: #333333;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);

    /* 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: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

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

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-primary-hover);
}

/* ============================================
   Layout
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.page-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

/* ============================================
   Header
   ============================================ */
.site-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

/* ============================================
   Page Header
   ============================================ */
.page-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.page-header h1 {
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Invoice Layout
   ============================================ */
.invoice-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

@media (max-width: 1200px) {
    .invoice-layout {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Form Panel
   ============================================ */
.form-panel {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

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

.form-section:last-of-type {
    border-bottom: none;
}

.section-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-lg);
}

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

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

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

.form-input[readonly] {
    background-color: var(--bg-card);
    color: var(--text-secondary);
}

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

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

.form-row-3 {
    grid-template-columns: 1fr 1fr 1fr;
}

@media (max-width: 600px) {
    .form-row,
    .form-row-3 {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Logo Upload
   ============================================ */
.logo-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    overflow: hidden;
}

.logo-upload-area:hover {
    border-color: var(--accent-primary);
}

.logo-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
    gap: var(--spacing-sm);
}

.logo-placeholder svg {
    opacity: 0.5;
}

.logo-preview {
    position: relative;
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
}

.logo-preview img {
    max-width: 150px;
    max-height: 80px;
    object-fit: contain;
}

.btn-remove-logo {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background-color: var(--accent-danger);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.btn-remove-logo:hover {
    background-color: #dc2626;
}

/* ============================================
   Line Items
   ============================================ */
.line-items-container {
    margin-bottom: var(--spacing-md);
}

.line-item {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.line-item:last-child {
    margin-bottom: 0;
}

.line-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.line-item-number {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

.btn-remove-item {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    transition: color var(--transition-fast);
}

.btn-remove-item:hover {
    color: var(--accent-danger);
}

.line-item-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-md);
    align-items: end;
}

@media (max-width: 600px) {
    .line-item-row {
        grid-template-columns: 1fr 1fr;
    }

    .line-item-row .form-group:first-child {
        grid-column: span 2;
    }
}

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

.line-item-row .form-group label {
    font-size: 0.8rem;
}

.line-total-display {
    background-color: var(--bg-card);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: right;
    font-weight: 600;
    color: var(--accent-primary);
}

.btn-add-item {
    width: 100%;
    justify-content: center;
}

/* ============================================
   Totals
   ============================================ */
.totals-grid {
    max-width: 300px;
    margin-left: auto;
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

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

.total-row span:first-child {
    color: var(--text-secondary);
}

.total-value {
    font-weight: 600;
    font-family: var(--font-mono);
}

.tax-row {
    padding: var(--spacing-md) 0;
}

.tax-input-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.tax-input {
    width: 60px;
    padding: var(--spacing-xs) var(--spacing-sm);
    text-align: center;
}

.total-final {
    padding: var(--spacing-md) 0;
    font-size: 1.1rem;
}

.total-final .total-value {
    color: var(--accent-primary);
    font-size: 1.25rem;
}

/* ============================================
   Form Actions
   ============================================ */
.form-actions {
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* ============================================
   Preview Panel
   ============================================ */
.preview-panel {
    position: sticky;
    top: calc(60px + var(--spacing-xl));
}

@media (max-width: 1200px) {
    .preview-panel {
        position: static;
    }
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.preview-header h3 {
    margin-bottom: 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

.preview-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.preview-wrapper {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    overflow: auto;
    max-height: calc(100vh - 200px);
}

/* ============================================
   Invoice Preview (Light Theme)
   ============================================ */
.invoice-preview {
    background-color: #ffffff;
    color: #1a1a1a;
    padding: 40px;
    min-height: 800px;
    font-size: 14px;
    box-shadow: var(--shadow-lg);
}

.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e5e7eb;
}

.invoice-logo-area {
    flex: 1;
}

.invoice-logo-area img {
    max-width: 180px;
    max-height: 80px;
    object-fit: contain;
}

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

.invoice-title {
    font-size: 32px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 0 0 15px 0;
    letter-spacing: 2px;
}

.invoice-meta {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.meta-row {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
}

.meta-label {
    color: #6b7280;
    font-weight: 500;
}

.meta-value {
    font-weight: 600;
    min-width: 100px;
    text-align: right;
}

/* ============================================
   Parties Section
   ============================================ */
.invoice-parties {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.party-block h4 {
    font-size: 11px;
    font-weight: 600;
    color: #9ca3af;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.party-name {
    font-size: 16px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 5px;
}

.party-address,
.party-contact {
    color: #4b5563;
    font-size: 13px;
    margin-bottom: 3px;
    white-space: pre-line;
}

/* ============================================
   Items Table
   ============================================ */
.invoice-items {
    margin-bottom: 30px;
}

.items-table {
    width: 100%;
    border-collapse: collapse;
}

.items-table th {
    background-color: #f3f4f6;
    padding: 12px 15px;
    text-align: left;
    font-size: 11px;
    font-weight: 600;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid #e5e7eb;
}

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

.items-table td {
    padding: 15px;
    border-bottom: 1px solid #e5e7eb;
    color: #374151;
}

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

.items-table .empty-row td {
    text-align: center;
    color: #9ca3af;
    font-style: italic;
    padding: 30px;
}

.col-description {
    width: 50%;
}

.col-qty {
    width: 10%;
}

.col-price {
    width: 20%;
}

.col-amount {
    width: 20%;
}

/* ============================================
   Invoice Totals
   ============================================ */
.invoice-totals {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 40px;
}

.totals-table {
    width: 250px;
}

.totals-table .totals-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid #e5e7eb;
}

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

.totals-table .totals-row span:first-child {
    color: #6b7280;
}

.totals-table .totals-row span:last-child {
    font-family: var(--font-mono);
    font-weight: 500;
}

.totals-table .total-row {
    background-color: #f3f4f6;
    margin-top: 10px;
    padding: 12px;
    border-radius: 6px;
    border: none;
}

.totals-table .total-row span:first-child {
    font-weight: 600;
    color: #1a1a1a;
}

.totals-table .total-row span:last-child {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
}

/* ============================================
   Invoice Notes
   ============================================ */
.invoice-notes {
    background-color: #f9fafb;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.invoice-notes h4 {
    font-size: 11px;
    font-weight: 600;
    color: #9ca3af;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.invoice-notes p {
    color: #4b5563;
    font-size: 13px;
    margin: 0;
    white-space: pre-line;
}

.invoice-notes.hidden {
    display: none;
}

/* ============================================
   Invoice Footer
   ============================================ */
.invoice-footer {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #e5e7eb;
}

.invoice-footer p {
    color: #9ca3af;
    font-size: 13px;
    margin: 0;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-primary-hover);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-card-hover);
    border-color: var(--border-color-light);
}

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

.btn-success:hover:not(:disabled) {
    background-color: #0da06f;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

/* ============================================
   Toast Notification
   ============================================ */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--accent-success);
    color: white;
    border-radius: var(--radius-md);
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.error {
    background-color: var(--accent-danger);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-lg) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-links a:hover {
    color: var(--text-primary);
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

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

.mt-3 {
    margin-top: var(--spacing-lg);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .main-content {
        padding: var(--spacing-lg) 0;
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-links {
        gap: var(--spacing-md);
        flex-wrap: wrap;
        justify-content: center;
    }

    .preview-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }

    .preview-actions {
        justify-content: center;
    }

    .invoice-preview {
        padding: 20px;
        font-size: 12px;
    }

    .invoice-header {
        flex-direction: column;
        gap: 20px;
    }

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

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

    .invoice-parties {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .items-table th,
    .items-table td {
        padding: 8px;
        font-size: 11px;
    }

    .form-actions {
        justify-content: center;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    /* Hide everything except the invoice preview */
    body * {
        visibility: hidden;
    }

    .invoice-preview,
    .invoice-preview * {
        visibility: visible;
    }

    .invoice-preview {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        box-shadow: none;
        padding: 20px;
        background: white !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    /* Ensure backgrounds print */
    .items-table th,
    .totals-table .total-row,
    .invoice-notes {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    /* Hide browser UI */
    @page {
        margin: 0.5in;
        size: letter;
    }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-normal) ease-out;
}

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

.line-item {
    animation: slideIn var(--transition-normal) ease-out;
}