/* CSS Variables */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --border-color: #e5e7eb;
    --text-color: #111827;
    --secondary-text-color: #6b7280;
    --shadow-color: rgba(0, 0, 0, 0.05);
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Page Visibility */
.page {
    display: block;
}

.page.hidden {
    display: none;
}

.content-page {
    display: block;
}

.content-page.hidden {
    display: none;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}
.logo a {
  text-decoration: none;
}
/* Login Page */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-lg);
}

.login-card {
    background: var(--card-background);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-header h1 {
    font-size: var(--font-size-3xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.login-header p {
    color: var(--secondary-text-color);
    font-size: var(--font-size-md);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.login-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.btn-google {
    background: #111827;
    color: white;
}

.btn-google:hover {
    background: #000000;
}

.auth-message {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
}

.auth-message-success {
    background: #dcfce7;
    color: #166534;
}

.auth-message-error {
    background: #fee2e2;
    color: #991b1b;
}

.login-hint {
    text-align: center;
    color: var(--secondary-text-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-lg);
}

/* Login Footer */
.login-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.login-footer p {
    color: var(--secondary-text-color);
    font-size: var(--font-size-sm);
}

.login-footer .link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.login-footer .link:hover {
    text-decoration: underline;
}

/* Google Auth Button */
.btn-google {
    background: white;
    color: #1a1a2e;
    border: 1px solid #e8eaf0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-google:hover {
    background: #f8fafc;
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.btn-google svg {
    display: block;
}

/* Google Auth Divider */
.google-auth-divider {
    display: flex;
    align-items: center;
    margin: 20px 0;
    color: #64748b;
}

.google-auth-divider::before,
.google-auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: #e8eaf0;
}

.google-auth-divider span {
    padding: 0 16px;
    font-size: 13px;
    font-weight: 500;
}

/* Responsive Design for Login/Register Pages */
@media (max-width: 480px) {
    .login-container {
        padding: var(--spacing-md);
    }

    .login-card {
        padding: var(--spacing-xl);
        max-width: 100%;
    }

    .login-header h1 {
        font-size: var(--font-size-2xl);
    }

    .login-header p {
        font-size: var(--font-size-sm);
    }

    .form-group input {
        font-size: 16px; /* Prevent iOS zoom on focus */
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .login-container {
        padding: var(--spacing-lg);
    }

    .login-card {
        padding: var(--spacing-2xl);
        max-width: 420px;
    }

    .login-header h1 {
        font-size: var(--font-size-3xl);
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .login-container {
        padding: var(--spacing-xl);
    }

    .login-card {
        padding: var(--spacing-2xl);
        max-width: 450px;
    }
}

@media (min-width: 1025px) {
    .login-container {
        padding: var(--spacing-2xl);
    }

    .login-card {
        padding: var(--spacing-2xl);
        max-width: 400px;
    }
}

/* Navigation Bar */
.navbar {
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 3px var(--shadow-color);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-brand h2 {
    color: var(--primary-color);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.logo-link {
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo-image {
    height: 100px;
    width: 100px;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--secondary-text-color);
    text-decoration: none;
    font-size: var(--font-size-md);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

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

.nav-link.active {
    color: var(--primary-color);
    background: var(--background-color);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-name {
    color: var(--text-color);
    font-weight: 500;
}

.btn-logout {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-color);
    transition: var(--transition-fast);
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-md);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
}

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

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

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

.btn-secondary:hover {
    background: #475569;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8125rem;
}

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

/* Page Header */
.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    font-size: var(--font-size-3xl);
    color: var(--text-color);
    margin-bottom: var(--spacing-xs);
}

.page-header p {
    color: var(--secondary-text-color);
    font-size: var(--font-size-md);
}

.back-button {
    margin-bottom: var(--spacing-md);
    padding: calc(var(--spacing-sm) - 2px) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.back-button.hidden {
    display: none;
}

/* Page Actions */
.page-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--card-background);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 1px 3px var(--shadow-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: transform var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.stat-icon-blue {
    background: var(--primary-color);
}

.stat-icon-green {
    background: var(--success-color);
}

.stat-icon-yellow {
    background: var(--warning-color);
}

.stat-icon-purple {
    background: #8b5cf6;
}

.stat-content h3 {
    font-size: var(--font-size-sm);
    color: var(--secondary-text-color);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-color);
}

/* Quick Actions */
.quick-actions {
    margin-bottom: var(--spacing-xl);
}

.quick-actions h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.action-btn {
    padding: var(--spacing-md) var(--spacing-lg);
}

/* Module Grid */
.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.module-card {
    background: var(--card-background);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 1px 3px var(--shadow-color);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.module-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.module-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    color: white;
}

.module-icon-blue {
    background: var(--primary-color);
}

.module-icon-green {
    background: var(--success-color);
}

.module-icon-purple {
    background: #8b5cf6;
}

.module-icon-yellow {
    background: var(--warning-color);
}

.module-card h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

.module-card p {
    color: var(--secondary-text-color);
    font-size: var(--font-size-md);
}

/* Placeholder Grid */
.placeholder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.placeholder-card {
    background: #e5e7eb;
    border-radius: var(--border-radius-md);
    height: 120px;
    opacity: 0.5;
}

/* Action Cards */
.action-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
}

.action-card {
    background: var(--card-background);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: 0 1px 3px var(--shadow-color);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.action-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.action-icon {
    width: 100px;
    height: 100px;
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    background: var(--primary-color);
    color: white;
}

.action-card h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.action-card p {
    color: var(--secondary-text-color);
    font-size: var(--font-size-md);
}

/* Recent Section */
.recent-section {
    margin-bottom: var(--spacing-xl);
}

.recent-section h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
}

.dashboard-summary-grid {
    margin-bottom: var(--spacing-xl);
}

/* Tables */
.table-container {
    background: var(--card-background);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 1px 3px var(--shadow-color);
    overflow: hidden;
}

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

.data-table thead {
    background: var(--background-color);
}

.data-table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--secondary-text-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    font-size: var(--font-size-md);
}

.data-table tbody tr:hover {
    background: var(--background-color);
}

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

.data-table a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.data-table a:hover {
    text-decoration: underline;
}

.no-data {
    text-align: center;
    color: var(--secondary-text-color);
    padding: var(--spacing-xl);
}

/* Status Badges */
.status-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all 0.2s ease;
}

.status-paid {
    background: #d1fae5;
    color: #065f46;
    cursor: default;
}

.status-due {
    background: #fef3c7;
    color: #92400e;
    cursor: pointer;
}

.status-due:hover {
    background: #fde68a;
    opacity: 0.9;
}

.status-pending {
    background: #fef3c7;
    color: #92400e;
}

.status-overdue {
    background: #fee2e2;
    color: #991b1b;
}

.text-success {
    color: #10b981;
    font-weight: 500;
}

/* Search and Filter Bar */
.search-filter-bar {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    align-items: flex-end;
}

.invoice-view-filter {
    justify-content: space-between;
}

.search-box,
.filter-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.search-box {
    flex: 1 1 360px;
}

.search-box input,
.filter-box input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-md);
}

.search-box input {
    flex: 1;
}

.search-box button,
.filter-box button {
    min-width: 110px;
}

.search-box input:focus,
.filter-box input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.filter-box {
    flex-direction: column;
    align-items: flex-start;
    background: var(--card-background);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 1px 3px var(--shadow-color);
}

.filter-labels {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: var(--spacing-sm);
}

.filter-title {
    font-size: var(--font-size-sm);
    color: var(--secondary-text-color);
}

.filter-subtitle {
    font-size: var(--font-size-lg);
    font-weight: 700;
    letter-spacing: 0.05em;
}

.filter-range {
    display: flex;
    gap: var(--spacing-md);
    width: 100%;
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.filter-field label {
    font-size: var(--font-size-sm);
    color: var(--secondary-text-color);
}

.filter-box button {
    align-self: stretch;
}

.filter-actions {
    display: flex;
    gap: var(--spacing-sm);
    width: 100%;
}

.filter-actions .btn {
    flex: 1;
    justify-content: center;
}

@media (max-width: 768px) {
    .search-filter-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-box,
    .search-box {
        width: 100%;
    }

    .filter-range {
        flex-direction: column;
    }

    .filter-actions {
        flex-direction: column;
    }
}

/* Invoice Form */
.invoice-form-container {
    background: var(--card-background);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 1px 3px var(--shadow-color);
}

.section-helper {
    color: var(--secondary-text-color);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.form-section {
    margin-bottom: var(--spacing-xl);
}

.form-section h2 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    color: var(--text-color);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-md);
    font-family: var(--font-family);
}

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

.readonly-field {
    background: var(--background-color);
    cursor: not-allowed;
}

/* Product Rows */
.product-row {
    display: grid;
    grid-template-columns: 1.2fr 1.4fr 1fr 0.9fr 1fr auto;
    gap: var(--spacing-md);
    align-items: end;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--background-color);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
}

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

.remove-product {
    padding: var(--spacing-sm);
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: var(--font-size-lg);
}

.remove-product:hover {
    background: #dc2626;
}

.line-total-box {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: #f1f5f9;
    font-weight: 600;
}

/* Summary */
.summary-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    font-size: var(--font-size-md);
}

.summary-row.total-row {
    font-size: var(--font-size-xl);
    font-weight: 700;
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--border-color);
    margin-top: var(--spacing-md);
}

.summary-row input {
    width: 100px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    text-align: right;
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-xl);
}

/* Category Filter */
.category-filter {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.category-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid var(--border-color);
    background: var(--card-background);
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.category-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.product-card {
    background: var(--card-background);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 1px 3px var(--shadow-color);
    transition: transform var(--transition-fast);
}

.product-card:hover {
    transform: translateY(-2px);
}

.product-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.product-card .category {
    color: var(--secondary-text-color);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.product-card .price {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.product-card .stock {
    font-size: var(--font-size-sm);
    color: var(--secondary-text-color);
}

.product-card .product-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.no-products {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--secondary-text-color);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: var(--spacing-lg);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--card-background);
    border-radius: var(--border-radius-lg);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: var(--font-size-xl);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-3xl);
    cursor: pointer;
    color: var(--secondary-text-color);
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-color);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Invoice Preview - Premium Enterprise Design */
.invoice-preview {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    color: #111827;
    max-width: 210mm;
    margin: 0 auto;
    padding: 20mm;
    background: #ffffff;
    line-height: 1.5;
    min-height: 297mm;
    box-sizing: border-box;
}

/* Header */
.invoice-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 2px solid #111827;
}

.header-left {
    flex: 1;
}

.company-logo-wrapper {
    margin-bottom: 16px;
}

.company-logo-image {
    width: 64px;
    height: 64px;
    object-fit: contain;
}

.logo-icon {
    width: 64px;
    height: 64px;
    background: #f3f4f6;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon::before {
    content: '';
    width: 32px;
    height: 32px;
    border: 2px solid #9ca3af;
    border-radius: 4px;
}

.company-info {
    margin-top: 16px;
}

.company-name {
    font-size: 18px;
    font-weight: 700;
    color: #111827;
    letter-spacing: -0.02em;
    margin: 0 0 8px 0;
}

.company-detail {
    font-size: 12px;
    color: #6b7280;
    margin: 4px 0;
    line-height: 1.4;
}

.header-right {
    text-align: right;
}

.invoice-title {
    font-size: 36px;
    font-weight: 800;
    color: #111827;
    letter-spacing: -0.04em;
    margin: 0 0 24px 0;
}

.invoice-details {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.detail-row {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 16px;
}

.detail-label {
    font-size: 11px;
    font-weight: 600;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.detail-value {
    font-size: 13px;
    font-weight: 500;
    color: #111827;
}

/* Status Badge */
.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.status-badge.status-paid {
    background: #dcfce7;
    color: #166534;
}

.status-badge.status-pending {
    background: #fef9c3;
    color: #854d0e;
}

.status-badge.status-overdue {
    background: #fee2e2;
    color: #991b1b;
}

/* Invoice Sections */
.invoice-section {
    margin-bottom: 24px;
}

.section-title {
    font-size: 11px;
    font-weight: 700;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

/* Customer Info */
.customer-info {
    padding: 16px 0;
}

.customer-name {
    font-size: 14px;
    font-weight: 600;
    color: #111827;
    margin-bottom: 8px;
}

.customer-detail {
    font-size: 12px;
    color: #6b7280;
    margin: 4px 0;
    line-height: 1.4;
}

/* Items Table */
.invoice-table-section {
    margin-bottom: 24px;
}

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

.items-table thead {
    border-bottom: 2px solid #111827;
}

.items-table th {
    font-size: 11px;
    font-weight: 700;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 12px 8px;
    text-align: left;
}

.col-item {
    width: 40px;
    text-align: center;
}

.col-description {
    flex: 1;
}

.col-qty {
    width: 60px;
    text-align: center;
}

.col-price {
    width: 100px;
    text-align: right;
}

.col-amount {
    width: 100px;
    text-align: right;
}

.items-table tbody tr {
    border-bottom: 1px solid #e5e7eb;
}

.items-table tbody tr:last-child {
    border-bottom: none;
}

.items-table td {
    font-size: 12px;
    color: #111827;
    padding: 12px 8px;
    vertical-align: top;
}

.items-table .col-item {
    text-align: center;
    color: #6b7280;
}

.items-table .col-price,
.items-table .col-amount {
    text-align: right;
    font-weight: 500;
}

/* Totals Section */
.totals-section {
    display: flex;
    justify-content: flex-end;
}

.totals-wrapper {
    width: 200px;
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid #e5e7eb;
}

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

.total-label {
    font-size: 12px;
    font-weight: 500;
    color: #6b7280;
}

.total-value {
    font-size: 13px;
    font-weight: 600;
    color: #111827;
}

.total-value-wrapper {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.payment-dates {
    font-size: 10px;
    color: #6b7280;
    margin-top: 2px;
}

.total-row-grand {
    border-top: 2px solid #111827;
    padding-top: 12px;
    margin-top: 4px;
}

.total-value-grand {
    font-size: 16px;
    font-weight: 800;
    color: #111827;
}

/* Footer */
.invoice-footer {
    margin-top: 32px;
    padding-top: 16px;
    border-top: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-message {
    font-size: 12px;
    color: #6b7280;
    font-style: italic;
}

.footer-date {
    font-size: 11px;
    color: #9ca3af;
}

/* Responsive Design */
@media (max-width: 768px) {
    .invoice-preview {
        padding: 32px 24px;
        border-radius: 8px;
    }

    .invoice-header {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .invoice-title-section {
        align-items: flex-start;
    }

    .invoice-meta {
        align-items: flex-start;
    }

    .table-header,
    .table-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .table-col {
        font-size: 11px;
    }

    .table-row {
        padding: 12px 16px;
    }

    .summary-card {
        width: 100%;
    }
}

/* Signature - Premium Styling */
.signature-section {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #e8eaf0;
}

.signature-line {
    width: 160px;
    height: 2px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    margin-bottom: 8px;
    margin-left: auto;
}

.signature-section p {
    text-align: right;
    font-size: 12px;
    color: #64748b;
    margin: 0;
    font-weight: 600;
}

.signature-name {
    font-family: 'Brush Script MT', 'Segoe Script', cursive;
    font-size: 24px !important;
    color: #667eea !important;
    margin-top: 8px !important;
    margin-bottom: 4px !important;
    font-weight: 700;
}

.signature-title {
    font-size: 11px !important;
    color: #64748b !important;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 700;
}

/* Responsive Design for Invoice Preview */
@media (max-width: 768px) {
    .invoice-preview {
        padding: 25px 20px;
        border-radius: 12px;
    }

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

    .invoice-header-right {
        text-align: left;
    }

    .invoice-meta-right {
        text-align: left;
    }

    .company-info {
        padding-left: 0;
    }

    .invoice-to {
        padding-left: 0;
    }

    .product-table-header {
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 10px;
        padding: 12px 15px;
        font-size: 10px;
    }

    .product-table-row {
        grid-template-columns: 2fr 1fr 1fr 1fr;
        gap: 10px;
        padding: 14px 15px;
        font-size: 12px;
    }

    .invoice-footer {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .invoice-title {
        font-size: 32px;
    }

    .total-grand {
        font-size: 18px;
    }
}

@media (max-width: 480px) {
    .invoice-preview {
        padding: 20px 15px;
    }

    .company-logo {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .logo-icon,
    .company-logo-image {
        width: 48px;
        height: 48px;
    }

    .company-name {
        font-size: 20px;
    }

    .invoice-title {
        font-size: 28px;
    }

    .product-table-header,
    .product-table-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .product-col-price,
    .product-col-qty,
    .product-col-total {
        font-size: 11px;
    }

    .total-grand {
        font-size: 16px;
        padding: 12px 15px;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--card-background);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: 0 4px 6px var(--shadow-color);
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .user-profile {
        display: none;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
    }

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

    .search-filter-bar {
        flex-direction: column;
    }

    .search-box,
    .filter-box {
        width: 100%;
        flex-wrap: wrap;
    }

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

    .remove-product {
        width: 100%;
    }

    /* Don't break invoice preview in responsive mode */
    .invoice-preview-details {
        grid-template-columns: 1fr 1fr;
    }

    .invoice-preview-total .total-wrapper {
        width: 100%;
    }

    .table-container {
        overflow-x: auto;
    }

    .data-table {
        min-width: 600px;
    }
}

/* Print Styles */
@media print {
    /* Force color printing */
    * {
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
        box-sizing: border-box !important;
    }

    /* Reset page */
    html, body {
        background: white !important;
        padding: 0 !important;
        margin: 0 !important;
        width: 100% !important;
        height: auto !important;
    }

    /* Hide everything except the temp print container */
    body > *:not(#temp-print-container) {
        display: none !important;
    }

    /* Invoice container for print */
    #temp-print-container {
        display: block !important;
        position: static !important;
        width: 100% !important;
        max-width: 210mm !important;
        margin: 0 auto !important;
        background: white !important;
        page-break-inside: avoid !important;
        padding: 15mm !important;
        box-shadow: none !important;
        border-radius: 0 !important;
        min-height: auto !important;
    }

    /* Header */
    #temp-print-container .invoice-header {
        margin-bottom: 16px !important;
        padding-bottom: 16px !important;
    }

    #temp-print-container .invoice-title {
        font-size: 28px !important;
        margin-bottom: 16px !important;
    }

    #temp-print-container .company-name {
        font-size: 16px !important;
    }

    #temp-print-container .company-detail {
        font-size: 11px !important;
    }

    #temp-print-container .detail-label,
    #temp-print-container .detail-value {
        font-size: 11px !important;
    }

    /* Sections */
    #temp-print-container .invoice-section {
        margin-bottom: 16px !important;
    }

    #temp-print-container .section-title {
        font-size: 10px !important;
        margin-bottom: 8px !important;
    }

    /* Customer */
    #temp-print-container .customer-name {
        font-size: 13px !important;
    }

    #temp-print-container .customer-detail {
        font-size: 11px !important;
    }

    /* Table */
    #temp-print-container .items-table th {
        font-size: 10px !important;
        padding: 8px 6px !important;
    }

    #temp-print-container .items-table td {
        font-size: 11px !important;
        padding: 8px 6px !important;
    }

    /* Totals */
    #temp-print-container .totals-wrapper {
        width: 180px !important;
    }

    #temp-print-container .total-label {
        font-size: 11px !important;
    }

    #temp-print-container .total-value {
        font-size: 12px !important;
    }

    #temp-print-container .total-value-grand {
        font-size: 14px !important;
    }

    #temp-print-container .payment-dates {
        font-size: 9px !important;
    }

    /* Footer */
    #temp-print-container .invoice-footer {
        margin-top: 16px !important;
        padding-top: 12px !important;
    }

    #temp-print-container .footer-message,
    #temp-print-container .footer-date {
        font-size: 10px !important;
    }

    /* Status badge */
    #temp-print-container .status-badge {
        font-size: 10px !important;
        padding: 2px 8px !important;
    }

    /* Make sure everything in the container is visible */
    #temp-print-container * {
        visibility: visible !important;
    }

    /* Page settings */
    @page {
        margin: 0;
        size: A4;
    }
}

/* Payments List Styles */
.payments-list {
    margin-top: var(--spacing-md);
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
}

.payments-header {
    font-weight: 600;
    font-size: var(--font-size-md);
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

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

.payment-item:last-child {
    border-bottom: none;
}

.payment-info {
    flex: 1;
}

.payment-amount {
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--success-color);
}

.payment-method {
    font-size: var(--font-size-sm);
    color: var(--secondary-text-color);
    margin-top: 2px;
}

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

.payment-date {
    font-size: var(--font-size-sm);
    color: var(--secondary-text-color);
}

.payment-note {
    font-size: var(--font-size-sm);
    color: var(--text-color);
    margin-top: 4px;
    font-style: italic;
}

.payment-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.payment-actions .btn {
    padding: 4px 12px;
    font-size: 12px;
    border-radius: 4px;
}

.payment-actions .btn-danger {
    background: var(--danger-color);
    color: white;
    border: none;
}

.payment-actions .btn-danger:hover {
    background: #dc2626;
}