/**
 * Radhe Kirana & Sabji POS System
 * Corporate POS & Banking-Grade Mobile-First Stylesheet
 * Strict Standard: No Emojis, No Gradients, 1px Crisp Borders, 44px+ Tap Targets
 */

:root {
    /* Color Palette: Professional Corporate Slate & Navy */
    --primary-color: #0F2C59;
    --primary-hover: #0a1e3d;
    --primary-light: #EEF2F6;
    
    --accent-blue: #0284C7;
    --accent-blue-hover: #0369A1;
    
    --success-color: #16A34A;
    --success-bg: #F0FDF4;
    --success-border: #BBF7D0;
    
    --warning-color: #D97706;
    --warning-bg: #FFFBEB;
    --warning-border: #FDE68A;
    
    --danger-color: #DC2626;
    --danger-bg: #FEF2F2;
    --danger-border: #FECACA;
    
    /* Backgrounds & Text */
    --bg-page: #F1F5F9;
    --bg-card: #FFFFFF;
    --bg-header: #0F2C59;
    --bg-subtle: #F8FAFC;
    --bg-active: #E2E8F0;
    
    --text-main: #0F172A;
    --text-muted: #475569;
    --text-light: #94A3B8;
    --text-white: #FFFFFF;
    
    /* Structural Rules */
    --border-color: #CBD5E1;
    --border-subtle: #E2E8F0;
    --border-radius-sm: 4px;
    --border-radius-md: 6px;
    --border-radius-lg: 8px;
    
    --font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans Devanagari', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Consolas', 'Menlo', 'Courier New', monospace;
    
    --bottom-nav-height: 64px;
    --top-header-height: 56px;
}

/* Reset & Box Sizing */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.45;
    font-size: 15px;
    padding-bottom: calc(var(--bottom-nav-height) + 20px);
    -webkit-font-smoothing: antialiased;
}

/* App Container */
.app-container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    padding: 12px;
}

@media (min-width: 992px) {
    .app-container {
        max-width: 1080px;
        padding: 20px;
    }
}

/* Top App Header */
.top-header {
    background-color: var(--bg-header);
    color: var(--text-white);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid #081a36;
}

.top-header-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 10px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--top-header-height);
}

.shop-branding {
    display: flex;
    flex-direction: column;
}

.shop-title {
    font-size: 1.05rem;
    font-weight: 700;
    line-height: 1.2;
    color: #FFFFFF;
    letter-spacing: -0.01em;
}

.shop-subtitle {
    font-size: 0.75rem;
    color: #94A3B8;
    margin-top: 2px;
}

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

.lang-select-btn {
    background-color: #1E3A8A;
    color: #FFFFFF;
    border: 1px solid #3B82F6;
    padding: 6px 10px;
    font-size: 0.78rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
}

.lock-btn {
    background-color: #334155;
    color: #F8FAFC;
    border: 1px solid #475569;
    padding: 6px 10px;
    font-size: 0.78rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    min-height: 36px;
    display: inline-flex;
    align-items: center;
}

/* Bottom Navigation Bar (Mobile First) */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background-color: #FFFFFF;
    border-top: 1px solid var(--border-color);
    display: flex;
    z-index: 1000;
    box-shadow: 0 -2px 6px rgba(0, 0, 0, 0.04);
}

.bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 6px 2px;
    border-right: 1px solid var(--border-subtle);
    text-align: center;
}

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

.bottom-nav-item.active {
    color: var(--primary-color);
    background-color: var(--primary-light);
    border-top: 3px solid var(--primary-color);
    font-weight: 700;
}

.bottom-nav-icon {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
    font-weight: 800;
}

/* Offline Notice Banner */
.offline-banner {
    display: none;
    background-color: #7F1D1D;
    color: #FFFFFF;
    padding: 8px 12px;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
}

/* Cards & Panels */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    margin-bottom: 14px;
    overflow: hidden;
}

.card-header {
    background-color: var(--bg-subtle);
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body {
    padding: 14px;
}

.card-footer {
    background-color: var(--bg-subtle);
    padding: 10px 14px;
    border-top: 1px solid var(--border-color);
}

/* Key Performance Indicator (KPI) Stats Grid */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 14px;
}

@media (min-width: 600px) {
    .kpi-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.kpi-card {
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--border-radius-md);
    padding: 12px;
}

.kpi-card.kpi-danger {
    border-left-color: var(--danger-color);
    background-color: var(--danger-bg);
}

.kpi-card.kpi-success {
    border-left-color: var(--success-color);
    background-color: var(--success-bg);
}

.kpi-card.kpi-warning {
    border-left-color: var(--warning-color);
    background-color: var(--warning-bg);
}

.kpi-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 4px;
    line-height: 1.2;
}

.kpi-value {
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.1;
    font-family: var(--font-family);
}

.kpi-subtext {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Quick Action Tiles (Thumb-friendly 48px+ targets) */
.action-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 16px;
}

@media (min-width: 600px) {
    .action-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.action-tile {
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 14px 10px;
    text-decoration: none;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 72px;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.action-tile:active, .action-tile:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-color);
}

.action-tile.primary-action {
    background-color: var(--primary-color);
    color: #FFFFFF;
    border-color: #081a36;
    grid-column: span 2;
    padding: 16px 14px;
}

.action-tile.primary-action:hover, .action-tile.primary-action:active {
    background-color: var(--primary-hover);
}

.action-title {
    font-size: 0.95rem;
    font-weight: 700;
    line-height: 1.25;
}

.action-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 3px;
    line-height: 1.2;
}

.primary-action .action-desc {
    color: #CBD5E1;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-family);
    font-size: 0.92rem;
    font-weight: 700;
    padding: 10px 16px;
    min-height: 46px;
    border-radius: var(--border-radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    line-height: 1.2;
    transition: background-color 0.15s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #FFFFFF;
    border-color: #081a36;
}

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

.btn-secondary {
    background-color: #FFFFFF;
    color: var(--text-main);
    border-color: var(--border-color);
}

.btn-secondary:hover, .btn-secondary:active {
    background-color: var(--bg-subtle);
    border-color: var(--text-muted);
}

.btn-success {
    background-color: var(--success-color);
    color: #FFFFFF;
    border-color: #15803d;
}

.btn-success:hover, .btn-success:active {
    background-color: #15803d;
}

.btn-danger {
    background-color: var(--danger-color);
    color: #FFFFFF;
    border-color: #b91c1c;
}

.btn-danger:hover, .btn-danger:active {
    background-color: #b91c1c;
}

.btn-warning {
    background-color: var(--warning-color);
    color: #FFFFFF;
    border-color: #b45309;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-sm {
    min-height: 36px;
    padding: 6px 10px;
    font-size: 0.82rem;
}

.btn-lg {
    min-height: 52px;
    padding: 14px 20px;
    font-size: 1.05rem;
}

/* Stepper Quantity Buttons (+ / -) */
.stepper {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: #FFFFFF;
    overflow: hidden;
}

.stepper-btn {
    background-color: var(--bg-subtle);
    color: var(--text-main);
    border: none;
    min-width: 44px;
    min-height: 44px;
    font-size: 1.25rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stepper-btn:hover, .stepper-btn:active {
    background-color: var(--border-color);
}

.stepper-input {
    width: 54px;
    min-height: 44px;
    border: none;
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    text-align: center;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-main);
    background-color: #FFFFFF;
}

/* Form Controls */
.form-group {
    margin-bottom: 14px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 6px;
}

.form-label .sub-label {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 0.78rem;
}

.form-control {
    width: 100%;
    min-height: 46px;
    padding: 8px 12px;
    font-size: 0.95rem;
    font-family: var(--font-family);
    color: var(--text-main);
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    outline: none;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(15, 44, 89, 0.15);
}

select.form-control {
    background-color: #FFFFFF;
    cursor: pointer;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 3px 8px;
    font-size: 0.72rem;
    font-weight: 700;
    border-radius: var(--border-radius-sm);
    border: 1px solid transparent;
    line-height: 1.2;
}

.badge-success {
    background-color: var(--success-bg);
    color: var(--success-color);
    border-color: var(--success-border);
}

.badge-warning {
    background-color: var(--warning-bg);
    color: var(--warning-color);
    border-color: var(--warning-border);
}

.badge-danger {
    background-color: var(--danger-bg);
    color: var(--danger-color);
    border-color: var(--danger-border);
}

.badge-secondary {
    background-color: var(--bg-subtle);
    color: var(--text-muted);
    border-color: var(--border-color);
}

.badge-primary {
    background-color: var(--primary-light);
    color: var(--primary-color);
    border-color: #CBD5E1;
}

/* Tables */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    background-color: #FFFFFF;
}

.table th {
    background-color: var(--bg-subtle);
    color: var(--text-muted);
    font-weight: 700;
    text-align: left;
    padding: 10px 12px;
    border-bottom: 2px solid var(--border-color);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border-subtle);
    vertical-align: middle;
}

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

.table-hover tbody tr:hover {
    background-color: #F8FAFC;
}

/* Category Filter Tabs */
.category-tabs {
    display: flex;
    overflow-x: auto;
    gap: 6px;
    padding: 4px 0 10px 0;
    scrollbar-width: none;
}

.category-tabs::-webkit-scrollbar {
    display: none;
}

.cat-tab-btn {
    white-space: nowrap;
    padding: 8px 14px;
    font-size: 0.85rem;
    font-weight: 700;
    border: 1px solid var(--border-color);
    background-color: #FFFFFF;
    color: var(--text-muted);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    min-height: 40px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
}

.cat-tab-btn.active {
    background-color: var(--primary-color);
    color: #FFFFFF;
    border-color: var(--primary-color);
}

/* POS Item Selection Grid */
.pos-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

@media (min-width: 900px) {
    .pos-layout {
        grid-template-columns: 1.2fr 1fr;
    }
}

.pos-item-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    max-height: 520px;
    overflow-y: auto;
    padding: 2px;
}

@media (min-width: 500px) {
    .pos-item-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.pos-item-card {
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 10px 8px;
    cursor: pointer;
    user-select: none;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 80px;
    transition: background-color 0.1s ease;
}

.pos-item-card:active {
    background-color: var(--primary-light);
    border-color: var(--primary-color);
}

.pos-item-name-hi {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
}

.pos-item-name-en {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.pos-item-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
    border-top: 1px dashed var(--border-subtle);
    padding-top: 4px;
}

.pos-item-price {
    font-size: 0.88rem;
    font-weight: 800;
    color: var(--primary-color);
}

.pos-item-stock {
    font-size: 0.70rem;
    color: var(--text-muted);
}

/* Bill Drawer & Summary */
.bill-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.bill-table th {
    background-color: var(--bg-subtle);
    padding: 8px 6px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.75rem;
}

.bill-table td {
    padding: 8px 6px;
    border-bottom: 1px solid var(--border-subtle);
    vertical-align: middle;
}

.bill-total-box {
    background-color: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 12px;
    margin-top: 12px;
}

.bill-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
    font-size: 0.88rem;
}

.bill-grand-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 8px;
    margin-top: 8px;
    border-top: 2px solid var(--border-color);
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--primary-color);
}

/* Alerts & Notices */
.alert {
    padding: 12px 14px;
    border-radius: var(--border-radius-sm);
    border: 1px solid transparent;
    font-size: 0.88rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.alert-success {
    background-color: var(--success-bg);
    color: #14532D;
    border-color: var(--success-border);
}

.alert-danger {
    background-color: var(--danger-bg);
    color: #7F1D1D;
    border-color: var(--danger-border);
}

.alert-warning {
    background-color: var(--warning-bg);
    color: #78350F;
    border-color: var(--warning-border);
}

.alert-info {
    background-color: var(--primary-light);
    color: #1E3A8A;
    border-color: #BFDBFE;
}

/* Modals */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.65);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 16px;
}

.modal-dialog {
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    width: 100%;
    max-width: 440px;
    overflow: hidden;
}

.modal-header {
    background-color: var(--bg-subtle);
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 700;
    font-size: 1rem;
}

.modal-body {
    padding: 16px;
}

.modal-footer {
    background-color: var(--bg-subtle);
    padding: 12px 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* Print Styles (Thermal Receipt & Bill Print) */
@media print {
    body {
        background-color: #FFFFFF !important;
        color: #000000 !important;
        padding: 0 !important;
        margin: 0 !important;
    }
    
    .top-header, .bottom-nav, .no-print, .btn, .offline-banner {
        display: none !important;
    }
    
    .app-container {
        max-width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
    }
    
    .receipt-container {
        width: 100% !important;
        max-width: 320px !important;
        margin: 0 auto !important;
        border: none !important;
        box-shadow: none !important;
        font-family: var(--font-mono) !important;
        font-size: 12px !important;
    }
}