/* Enhanced Modern POS Design System */

/* === IMPROVED DESIGN TOKENS === */
:root {
    /* Enhanced Dark Theme */
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-card: rgba(26, 26, 26, 0.8);
    --bg-card-hover: rgba(42, 42, 42, 0.9);
    
    /* Glass morphism effects */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    
    /* Improved text hierarchy */
    --text-primary: #ffffff;
    --text-secondary: #e5e7eb;
    --text-muted: #9ca3af;
    --text-accent: #3b82f6;
    --text-accent-bright: #60a5fa;
    
    /* Modern color palette */
    --accent-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --accent-success: linear-gradient(135deg, #4ade80 0%, #22c55e 100%);
    --accent-warning: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    --accent-danger: linear-gradient(135deg, #f87171 0%, #ef4444 100%);
    --accent-info: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 100%);
    
    /* Enhanced spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Modern shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(96, 165, 250, 0.3);
    
    /* Border radius scale */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Animation timing */
    --transition-fast: 0.15s ease-out;
    --transition-normal: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;
}

/* === ENHANCED BASE STYLES === */
body {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

/* === IMPROVED NAVIGATION === */
.navbar {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-md);
    padding: var(--space-md) 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary) !important;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.navbar-brand img {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

/* === MODERN CARDS === */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(255, 255, 255, 0.2);
}

.card-header {
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-lg);
    font-weight: 600;
    font-size: 1.1rem;
}

.card-body {
    padding: var(--space-lg);
}

/* === ENHANCED DASHBOARD CARDS === */
.stats-card {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.stats-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-primary);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.stats-card:hover::before {
    transform: scaleX(1);
}

.stats-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(255, 255, 255, 0.3);
}

.stats-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--accent-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-xs);
}

.stats-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.stats-icon {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    font-size: 2rem;
    opacity: 0.2;
    transition: all var(--transition-normal);
}

.stats-card:hover .stats-icon {
    opacity: 0.4;
    transform: scale(1.1);
}

/* Specific styling for average sale card */
.average-sale-card {
    background: linear-gradient(135deg, #667eea 0%, #1e88e5 100%) !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
}

.average-sale-value {
    color: #ffffff !important;
    font-weight: 800 !important;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4) !important;
    font-size: 2.2rem !important;
    background: none !important;
    -webkit-background-clip: unset !important;
    background-clip: unset !important;
    -webkit-text-fill-color: unset !important;
}

.average-sale-card .stats-label {
    color: #ffffff !important;
    font-weight: 600 !important;
}

.average-sale-card .stats-icon {
    color: rgba(255, 255, 255, 0.4) !important;
}

.average-sale-card .text-info {
    color: #ffffff !important;
}

/* Theme-aware company settings button */
.btn-outline-light {
    color: var(--text-primary) !important;
    border-color: var(--border-color) !important;
}

.btn-outline-light:hover {
    background-color: var(--text-primary) !important;
    border-color: var(--text-primary) !important;
    color: var(--bg-primary) !important;
}

/* Light theme specific overrides */
[data-theme='light'] .btn-outline-light {
    color: #333333 !important;
    border-color: #333333 !important;
}

[data-theme='light'] .btn-outline-light:hover {
    background-color: #333333 !important;
    border-color: #333333 !important;
    color: #ffffff !important;
}

/* === MODERN BUTTONS === */
.btn {
    border-radius: var(--radius-lg);
    font-weight: 600;
    letter-spacing: 0.025em;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--accent-primary);
    border: none;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-success {
    background: var(--accent-success);
    border: none;
    box-shadow: var(--shadow-md);
}

.btn-warning {
    background: var(--accent-warning);
    border: none;
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background: var(--accent-danger);
    border: none;
    box-shadow: var(--shadow-md);
}

.btn-info {
    background: var(--accent-info);
    border: none;
    box-shadow: var(--shadow-md);
}

/* === ENHANCED FORMS === */
.form-control {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    padding: var(--space-md);
}

.form-control:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--text-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    color: var(--text-primary);
}

.form-label {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--space-sm);
}

/* === IMPROVED TABLES === */
.table {
    background: transparent;
    color: var(--text-primary);
}

.table thead th {
    background: var(--glass-bg);
    border: none;
    padding: var(--space-lg);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
}

.table tbody td {
    border-color: var(--glass-border);
    padding: var(--space-lg);
    vertical-align: middle;
}

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

/* === ENHANCED ALERTS === */
.alert {
    border: none;
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

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

.alert-danger {
    background: var(--accent-danger);
    color: white;
}

.alert-warning {
    background: var(--accent-warning);
    color: white;
}

.alert-info {
    background: var(--accent-info);
    color: white;
}

/* === ENHANCED THEME TOGGLE === */
.theme-toggle {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: 1050;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    color: var(--text-primary);
    padding: var(--space-md) var(--space-lg);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
    box-shadow: var(--shadow-xl);
}

/* === LOADING ANIMATIONS === */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

.animate-slide-up {
    animation: slideInUp var(--transition-normal) ease-out;
}

/* === RESPONSIVE ENHANCEMENTS === */
@media (max-width: 768px) {
    .stats-card {
        margin-bottom: var(--space-lg);
    }
    
    .card-body {
        padding: var(--space-md);
    }
    
    .btn {
        padding: var(--space-md) var(--space-lg);
        font-size: 1rem;
    }
    
    .theme-toggle {
        top: var(--space-sm);
        right: var(--space-sm);
        padding: var(--space-sm) var(--space-md);
        font-size: 0.75rem;
    }
}

@media (min-width: 1200px) {
    .container-fluid {
        max-width: 1400px;
        margin: 0 auto;
    }
}

/* === LIGHT THEME OVERRIDES === */
[data-theme="light"] {
    --bg-primary: #fafafa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f5f5f5;
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.25);
}

[data-theme="light"] body {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

[data-theme="light"] .form-control {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .form-control:focus {
    background: white;
    border-color: var(--text-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* === MODERN POS STYLES === */
.pos-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
}

.status-indicator {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-sm) var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.875rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
}

.sync-dot {
    background: #f59e0b;
    animation: pulse 2s infinite;
}

.quick-stats {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    backdrop-filter: blur(10px);
    min-width: 120px;
}

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

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* === ENHANCED CATEGORY NAVIGATION === */
.category-nav {
    margin-bottom: var(--space-xl);
}

.category-pills {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.category-pill {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
    cursor: pointer;
    min-width: 120px;
    justify-content: center;
    backdrop-filter: blur(10px);
}

.category-pill:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--text-accent);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.category-pill.active {
    background: var(--accent-primary);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow);
}

.category-pill i {
    font-size: 1.1rem;
}

/* === PRODUCTS GRID === */
.products-section {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-xl);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
}

.products-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-lg);
    min-height: 400px;
}

.product-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.product-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left var(--transition-slow);
}

.product-item:hover::before {
    left: 100%;
}

.product-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--text-accent);
}

.product-item:active {
    transform: translateY(-2px);
}

.product-image {
    width: 60px;
    height: 60px;
    background: var(--accent-primary);
    border-radius: var(--radius-lg);
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.product-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    font-size: 1rem;
}

.product-price {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--accent-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-xs);
}

.product-stock {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* === MODERN CART STYLES === */
.modern-cart {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    height: fit-content;
    position: sticky;
    top: var(--space-lg);
}

.cart-header {
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: between;
}

.cart-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
    flex: 1;
}

.cart-counter {
    background: var(--accent-primary);
    color: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
}

.cart-config {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--glass-border);
}

.config-item {
    margin-bottom: var(--space-md);
}

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

.config-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    font-size: 0.875rem;
}

.modern-select, .modern-input {
    width: 100%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.modern-select:focus, .modern-input:focus {
    outline: none;
    border-color: var(--text-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    background: rgba(255, 255, 255, 0.08);
}

.client-info-section {
    padding-top: var(--space-md);
    border-top: 1px solid var(--glass-border);
    margin-top: var(--space-md);
}

.cart-items-container {
    max-height: 300px;
    overflow-y: auto;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--glass-border);
}

.cart-items {
    min-height: 150px;
}

.empty-cart {
    text-align: center;
    padding: var(--space-xl);
    color: var(--text-muted);
}

.empty-cart i {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.empty-cart p {
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.cart-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    transition: all var(--transition-fast);
}

.cart-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

.cart-totals {
    padding: var(--space-lg);
    background: var(--glass-bg);
}

.total-row {
    display: flex;
    justify-content: between;
    align-items: center;
    padding: var(--space-sm) 0;
    font-weight: 500;
}

.subtotal-row, .tax-row {
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-bottom: 1px solid var(--glass-border);
}

.final-row {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    padding-top: var(--space-md);
}

.final-row span:last-child {
    background: var(--accent-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.cart-actions {
    padding: var(--space-lg);
    background: var(--glass-bg);
    border-top: 1px solid var(--glass-border);
}

.cart-actions .btn {
    font-weight: 600;
    border: none;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.cart-actions .btn-success {
    background: var(--accent-success);
    box-shadow: var(--shadow-md);
}

.cart-actions .btn-warning {
    background: var(--accent-warning);
    box-shadow: var(--shadow-md);
}

.cart-actions .btn-danger {
    background: var(--accent-danger);
    box-shadow: var(--shadow-md);
}

/* === MOBILE OPTIMIZATIONS === */
@media (max-width: 768px) {
    .category-pills {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: var(--space-sm);
    }
    
    .category-pill {
        min-width: 100px;
        flex-shrink: 0;
    }
    
    .products-container {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--space-md);
    }
    
    .modern-cart {
        position: relative;
        top: 0;
    }
    
    .pos-icon {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }
    
    .quick-stats {
        min-width: 100px;
        padding: var(--space-sm);
    }
    
    .stat-value {
        font-size: 1rem;
    }
}

/* === PERFORMANCE & ACCESSIBILITY IMPROVEMENTS === */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

@media (prefers-reduced-transparency: reduce) {
    .card, .modern-cart, .products-section, .category-pill, .product-item {
        backdrop-filter: none !important;
        background: var(--bg-card) !important;
    }
    
    .status-indicator, .quick-stats {
        backdrop-filter: none !important;
        background: var(--bg-secondary) !important;
    }
}

/* Performance optimization for low-end devices */
@media (max-width: 768px), (hover: none) {
    .card, .modern-cart, .products-section {
        backdrop-filter: none;
        background: var(--bg-card);
    }
    
    .category-pill, .product-item {
        backdrop-filter: none;
        background: var(--bg-secondary);
    }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}