:root {
    --primary: #0f172a;
    --primary-light: #1e293b;
    --accent: #3b82f6;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #334155;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 4px;
    --sidebar-width: 250px;
}

body.theme-dark {
    --primary: #1e293b;
    --primary-light: #334155;
    --accent: #60a5fa;
    --bg: #0f172a;
    --surface: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
}

body.theme-ocean {
    --primary: #083344;
    --primary-light: #164e63;
    --accent: #06b6d4;
    --bg: #ecfeff;
    --surface: #ffffff;
    --text: #164e63;
    --text-muted: #67e8f9;
    --border: #cffafe;
}

body.theme-forest {
    --primary: #064e3b;
    --primary-light: #065f46;
    --accent: #10b981;
    --bg: #f0fdf4;
    --surface: #ffffff;
    --text: #064e3b;
    --text-muted: #34d399;
    --border: #dcfce7;
}

body.theme-sunset {
    --primary: #451a03;
    --primary-light: #78350f;
    --accent: #f59e0b;
    --bg: #fffbeb;
    --surface: #ffffff;
    --text: #451a03;
    --text-muted: #fbbf24;
    --border: #fef3c7;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    overflow-x: hidden;
}

[dir="rtl"] {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--primary);
    color: white;
    position: fixed;
    top: 0;
    transition: all 0.3s;
    z-index: 1000;
}

[dir="ltr"] .sidebar { left: 0; }
[dir="rtl"] .sidebar { right: 0; }

.sidebar-header {
    padding: 1.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    border-bottom: 1px solid var(--primary-light);
}

.nav-link {
    color: #cbd5e1;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: background 0.2s;
}

.nav-link:hover, .nav-link.active {
    background-color: var(--primary-light);
    color: white;
}

.nav-link i {
    width: 20px;
    margin-right: 10px;
}

.nav-section-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: #64748b !important;
    letter-spacing: 0.05em;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-section-title:hover {
    color: #94a3b8 !important;
}

.nav-section-title i.chevron {
    transition: transform 0.2s;
    font-size: 0.6rem;
}

.nav-section-title.collapsed i.chevron {
    transform: rotate(-90deg);
}

.nav-section-title .group-icon {
    width: 18px;
    margin-right: 10px;
}

[dir="rtl"] .nav-section-title .group-icon {
    margin-right: 0;
    margin-left: 10px;
}

/* POS Styles */
.pos-container {
    display: flex;
    height: calc(100vh - 120px);
    gap: 20px;
}
.pos-products {
    flex: 1;
    overflow-y: auto;
    padding-right: 10px;
}
.pos-cart {
    width: 400px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    height: 100%;
}
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 15px;
}
.product-card {
    background: #fff;
    border-radius: 10px;
    border: 1px solid #edf2f7;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    border-color: #3b82f6;
}
.product-card img {
    width: 100%;
    height: 120px;
    object-fit: contain;
    margin-bottom: 10px;
    border-radius: 8px;
}
.product-card .price {
    font-weight: 700;
    color: #2d3748;
}
.cart-items {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}
.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #edf2f7;
}
.cart-total {
    padding: 20px;
    background: #f8fafc;
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
}
.qty-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}
.qty-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1px solid #e2e8f0;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
}
.qty-btn:hover {
    background: #edf2f7;
}

[dir="rtl"] .nav-link i {
    margin-right: 0;
    margin-left: 10px;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    padding: 2rem;
    transition: all 0.3s;
    min-height: 100vh;
}

[dir="rtl"] .main-content {
    margin-left: 0;
    margin-right: var(--sidebar-width);
}

@media (max-width: 991.98px) {
    .sidebar {
        left: calc(-1 * var(--sidebar-width));
    }
    .sidebar.show {
        left: 0;
    }
    [dir="rtl"] .sidebar {
        right: calc(-1 * var(--sidebar-width));
        left: auto;
    }
    [dir="rtl"] .sidebar.show {
        right: 0;
    }
    .main-content {
        margin-left: 0 !important;
        margin-right: 0 !important;
        width: 100%;
    }
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 999;
}
.sidebar-overlay.show {
    display: block;
}

.topbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    margin: -2rem -2rem 2rem -2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* UI Components */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.btn-primary {
    background-color: var(--accent);
    border: none;
    border-radius: var(--radius);
}

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

.table th {
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--border);
}

.op-50 {
    opacity: 0.5;
}

/* RTL Adjustments */
[dir="rtl"] .ms-auto {
    margin-right: auto !important;
    margin-left: 0 !important;
}

[dir="rtl"] .text-end {
    text-align: left !important;
}

[dir="rtl"] .text-start {
    text-align: right !important;
}

[dir="rtl"] .me-3 {
    margin-right: 0 !important;
    margin-left: 1rem !important;
}

[dir="rtl"] .me-2 {
    margin-right: 0 !important;
    margin-left: 0.5rem !important;
}

[dir="rtl"] .ms-2 {
    margin-left: 0 !important;
    margin-right: 0.5rem !important;
}

/* Thermal Receipt Styles */
.thermal-receipt {
    width: 80mm;
    margin: 0 auto;
    padding: 10px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 12px;
    line-height: 1.2;
    background: #fff;
    color: #000;
}
.thermal-receipt .center {
    text-align: center;
}
.thermal-receipt .separator {
    border-top: 1px dashed #000;
    margin: 10px 0;
}
.thermal-receipt table {
    width: 100%;
}
.thermal-receipt table th {
    text-align: left;
    border-bottom: 1px dashed #000;
    font-size: 10px;
}
.thermal-receipt table td {
    padding: 5px 0;
    font-size: 10px;
}
.thermal-receipt .total-row {
    font-weight: bold;
    font-size: 14px;
}

@media print {
    .thermal-receipt-print {
        width: 80mm !important;
        margin: 0 !important;
        padding: 5mm !important;
    }
    body.printing-receipt * {
        visibility: hidden;
    }
    body.printing-receipt .thermal-receipt-print, 
    body.printing-receipt .thermal-receipt-print * {
        visibility: visible !important;
    }
    body.printing-receipt #posPrintArea {
        visibility: visible !important;
        display: block !important;
    }
    body.printing-receipt .thermal-receipt-print {
        position: absolute;
        left: 0;
        top: 0;
        display: block !important;
    }
}

/* Payment Modal Styles */
.payment-methods-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}
.payment-method-btn {
    border: 2px solid #e2e8f0;
    background: #fff;
    padding: 15px 10px;
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}
.payment-method-btn.active {
    border-color: #3b82f6;
    background: #eff6ff;
    color: #3b82f6;
}
.payment-method-btn i {
    font-size: 1.5rem;
    display: block;
    margin-bottom: 5px;
}

.quick-pay-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 5px;
    margin-top: 10px;
}
.quick-pay-btn {
    padding: 10px;
    border: 1px solid #e2e8f0;
    background: #f8fafc;
    border-radius: 6px;
    text-align: center;
    cursor: pointer;
    font-weight: 600;
}
.quick-pay-btn:hover {
    background: #edf2f7;
}

.amount-due-box {
    background: #f1f5f9;
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    margin-bottom: 20px;
}
.amount-due-box .label {
    font-size: 0.75rem;
    color: #64748b;
    text-transform: uppercase;
    font-weight: 600;
}
.amount-due-box .value {
    font-size: 2.5rem;
    font-weight: 800;
    color: #0f172a;
}
.payment-line {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 10px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid #e9ecef;
}
.payment-line .method {
    font-weight: 600;
    text-transform: capitalize;
}
.payment-line .amount {
    font-weight: 700;
}
.payment-summary {
    border-top: 2px dashed #dee2e6;
    margin-top: 15px;
    padding-top: 15px;
}