/* ============================================
   CSS Variables & Theme
   ============================================ */

:root {
    /* Colors */
    --primary: #14B8A6;
    --primary-dark: #0D9488;
    --primary-light: #5EEAD4;
    --secondary: #7C3AED;
    --secondary-dark: #6D28D9;
    --accent: #F59E0B;
    
    /* Backgrounds */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;
    --bg-dark: #0A1929;
    --bg-card: #FFFFFF;
    
    /* Text */
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --text-light: #FFFFFF;
    
    /* Borders */
    --border-color: #E2E8F0;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Sidebar */
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
}

/* Dark Mode */
.dark-mode {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-tertiary: #334155;
    --bg-card: #1E293B;
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-muted: #64748B;
    --border-color: #334155;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

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

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

/* ============================================
   Loading Screen
   ============================================ */

.loading-screen {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    z-index: 9999;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   Auth Container
   ============================================ */

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a365d 100%);
}

.auth-form {
    width: 100%;
    max-width: 420px;
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

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

.auth-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.auth-header p {
    color: var(--text-secondary);
}

/* ============================================
   Forms
   ============================================ */

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

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

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(20, 184, 166, 0.1);
}

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

.password-input {
    position: relative;
}

.password-input input {
    width: 100%;
    padding-right: 48px;
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    padding: 4px;
}

.toggle-password:hover {
    color: var(--text-secondary);
}

.eye-icon {
    width: 20px;
    height: 20px;
}

.error-message {
    font-size: 0.75rem;
    color: #EF4444;
    min-height: 18px;
}

.password-strength {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xs);
}

.strength-bar {
    flex: 1;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    transition: width var(--transition), background-color var(--transition);
}

.strength-text {
    font-size: 0.75rem;
    font-weight: 500;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

.forgot-link {
    color: var(--primary);
}

.auth-error {
    padding: var(--spacing-sm) var(--spacing-md);
    background: #FEE2E2;
    border: 1px solid #FECACA;
    border-radius: var(--border-radius);
    color: #DC2626;
    font-size: 0.875rem;
    display: none;
}

.auth-error.visible {
    display: block;
}

.dark-mode .auth-error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
}

.auth-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

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

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

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

.btn-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    color: var(--text-secondary);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.icon-btn svg {
    width: 20px;
    height: 20px;
}

/* ============================================
   Main Layout
   ============================================ */

.main-container {
    display: flex;
    min-height: 100vh;
}

/* ============================================
   Sidebar
   ============================================ */

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-dark);
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform var(--transition-slow);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: var(--spacing-sm);
}

.sidebar-toggle svg {
    width: 24px;
    height: 24px;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 12px 16px;
    color: rgba(255, 255, 255, 0.7);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xs);
    transition: all var(--transition-fast);
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-light);
}

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

.nav-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: white;
}

.user-details {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.user-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-email {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.logout-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: 12px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: var(--border-radius);
    color: rgba(255, 255, 255, 0.8);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.2);
    color: #EF4444;
}

.logout-btn svg {
    width: 18px;
    height: 18px;
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-btn svg {
    width: 24px;
    height: 24px;
}

.main-header h1 {
    flex: 1;
    font-size: 1.25rem;
    font-weight: 600;
}

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

.notification-btn {
    position: relative;
}

.notification-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 18px;
    height: 18px;
    background: #EF4444;
    color: white;
    font-size: 0.625rem;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   Pages
   ============================================ */

.page {
    display: none;
    padding: var(--spacing-lg);
    flex: 1;
}

.page.active {
    display: block;
}

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

.search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    min-width: 280px;
}

.search-box svg {
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.search-box input {
    border: none;
    background: none;
    outline: none;
    font-size: 0.875rem;
    color: var(--text-primary);
    width: 100%;
}

.filter-group {
    display: flex;
    gap: var(--spacing-sm);
}

.filter-select {
    padding: 10px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
}

/* ============================================
   Stats Cards
   ============================================ */

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

.stat-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

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

.stat-icon svg {
    width: 24px;
    height: 24px;
}

.stat-icon.blue {
    background: rgba(59, 130, 246, 0.1);
    color: #3B82F6;
}

.stat-icon.green {
    background: rgba(16, 185, 129, 0.1);
    color: #10B981;
}

.stat-icon.purple {
    background: rgba(124, 58, 237, 0.1);
    color: #7C3AED;
}

.stat-icon.orange {
    background: rgba(245, 158, 11, 0.1);
    color: #F59E0B;
}

.stat-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.stat-change {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
}

.stat-change.positive {
    background: rgba(16, 185, 129, 0.1);
    color: #10B981;
}

.stat-change.negative {
    background: rgba(239, 68, 68, 0.1);
    color: #EF4444;
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

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

.card-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.view-all {
    font-size: 0.875rem;
    color: var(--primary);
}

.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

.chart-card {
    min-height: 300px;
}

.chart-filter {
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.chart-container {
    padding: var(--spacing-lg);
    height: 250px;
}

/* ============================================
   Orders List
   ============================================ */

.orders-list {
    padding: var(--spacing-md);
}

.order-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: background var(--transition-fast);
}

.order-item:hover {
    background: var(--bg-tertiary);
}

.order-info {
    display: flex;
    flex-direction: column;
}

.order-id {
    font-weight: 600;
    color: var(--text-primary);
}

.order-customer {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.order-status {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.order-status.completed {
    background: rgba(16, 185, 129, 0.1);
    color: #10B981;
}

.order-status.pending {
    background: rgba(245, 158, 11, 0.1);
    color: #F59E0B;
}

.order-status.processing {
    background: rgba(59, 130, 246, 0.1);
    color: #3B82F6;
}

.order-amount {
    font-weight: 600;
    color: var(--text-primary);
}

/* ============================================
   Tables
   ============================================ */

.table-container {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

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

.data-table th,
.data-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.data-table td {
    font-size: 0.875rem;
}

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

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

.product-icon {
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: white;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.status-badge.in-stock {
    background: rgba(16, 185, 129, 0.1);
    color: #10B981;
}

.status-badge.low-stock {
    background: rgba(245, 158, 11, 0.1);
    color: #F59E0B;
}

.status-badge.out-of-stock {
    background: rgba(239, 68, 68, 0.1);
    color: #EF4444;
}

.status-badge.pending {
    background: rgba(245, 158, 11, 0.1);
    color: #F59E0B;
}

.status-badge.processing {
    background: rgba(59, 130, 246, 0.1);
    color: #3B82F6;
}

.status-badge.completed {
    background: rgba(16, 185, 129, 0.1);
    color: #10B981;
}

.status-badge.shipped {
    background: rgba(124, 58, 237, 0.1);
    color: #7C3AED;
}

.status-badge.cancelled {
    background: rgba(239, 68, 68, 0.1);
    color: #EF4444;
}

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

.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

.action-btn.delete:hover {
    background: #EF4444;
}

.action-btn svg {
    width: 16px;
    height: 16px;
}

/* ============================================
   Customers Grid
   ============================================ */

.customers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.customer-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.customer-avatar {
    width: 48px;
    height: 48px;
    background: var(--secondary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.25rem;
}

.customer-info {
    flex: 1;
}

.customer-info h4 {
    font-weight: 600;
    margin-bottom: 2px;
}

.customer-info p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.customer-stats {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.customer-actions {
    display: flex;
}

/* ============================================
   Reports
   ============================================ */

.reports-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--spacing-lg);
}

.report-card {
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.report-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.report-icon svg {
    width: 28px;
    height: 28px;
}

.report-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.report-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* ============================================
   Settings
   ============================================ */

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

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

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

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

.preference-info {
    display: flex;
    flex-direction: column;
}

.preference-label {
    font-weight: 500;
}

.preference-desc {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Toggle Switch */
.toggle {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: var(--transition);
    border-radius: 26px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition);
    border-radius: 50%;
}

.toggle input:checked + .toggle-slider {
    background-color: var(--primary);
}

.toggle input:checked + .toggle-slider:before {
    transform: translateX(22px);
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
    display: none !important;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .auth-form {
        padding: var(--spacing-lg);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-box {
        min-width: auto;
        width: 100%;
    }
    
    .filter-group {
        width: 100%;
    }
    
    .filter-select {
        flex: 1;
    }
    
    .data-table {
        display: block;
        overflow-x: auto;
    }
    
    .customers-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .auth-container {
        padding: var(--spacing-md);
    }
    
    .auth-header h1 {
        font-size: 1.5rem;
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}