/* ===== Modern POS System Styles ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* Modern Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-light: #818cf8;
    --primary-dark: #4338ca;
    --secondary-color: #10b981;
    --secondary-light: #34d399;
    --secondary-dark: #059669;
    --accent-color: #f59e0b;
    --accent-light: #fbbf24;
    --danger-color: #ef4444;
    --danger-light: #f87171;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --success-color: #10b981;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Design System */
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Scanner Modal Colors */
    --scanner-bg: #f8fafc;
    --scanner-border: #e2e8f0;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--primary-gradient);
    background-attachment: fixed;
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    font-weight: 400;
}

/* ===== Container & Layout ===== */
.container-fluid {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--border-radius-xl);
    margin: var(--spacing-md);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
}

/* ===== Navigation ===== */
.navbar {
    background: rgba(255, 255, 255, 0.98) !important;
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-md) 0;
}

.navbar-toggler {
    border: none;
    background: var(--primary-gradient);
    border-radius: var(--border-radius);
    color: white;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 0.25rem rgba(102, 126, 234, 0.25);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-pills .nav-link {
    border-radius: var(--border-radius);
    margin: 0 var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: 500;
    color: var(--gray-600);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.nav-pills .nav-link:hover {
    color: var(--primary-color);
    background: var(--gray-50);
    transform: translateY(-1px);
}

.nav-pills .nav-link.active {
    background: var(--primary-gradient) !important;
    color: white !important;
    box-shadow: var(--shadow-md);
}

/* Mobile navigation adjustments */
@media (max-width: 991.98px) {
    .nav-pills .nav-link {
        margin: var(--spacing-xs) 0;
        text-align: center;
    }
    
    .navbar-collapse {
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        border-radius: var(--border-radius);
        margin-top: var(--spacing-md);
        padding: var(--spacing-md);
        border: 1px solid var(--gray-200);
    }
}

/* ===== Cards ===== */
.card {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
    transition: var(--transition);
    background: white;
}

.card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.card-header {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: var(--spacing-lg);
    font-weight: 600;
    font-size: 1.1rem;
}

.card-body {
    padding: var(--spacing-xl);
}

/* ===== Buttons ===== */
.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-lg);
    transition: var(--transition);
    border: none;
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

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

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-success {
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-light));
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, var(--accent-color), var(--accent-light));
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), var(--danger-light));
    color: white;
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

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

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
    border-radius: var(--border-radius-lg);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.85rem;
}

/* ===== Forms ===== */
.form-control, .form-select {
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    font-size: 0.95rem;
    transition: var(--transition);
    background: white;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    outline: none;
}

.form-label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

.input-group {
    border-radius: var(--border-radius);
    overflow: hidden;
}

.input-group-text {
    background: var(--gray-50);
    border: 2px solid var(--gray-200);
    color: var(--gray-600);
    font-weight: 500;
}

/* ===== Tables ===== */
.table {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    background: white;
}

.table thead th {
    background: var(--gray-50);
    border: none;
    color: var(--gray-700);
    font-weight: 600;
    padding: var(--spacing-lg);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
}

.table tbody td {
    border: none;
    padding: var(--spacing-lg);
    vertical-align: middle;
    border-bottom: 1px solid var(--gray-100);
}

.table tbody tr:hover {
    background: var(--gray-50);
}

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

/* ===== Modals ===== */
.modal-content {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
}

.modal-header {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: var(--spacing-xl);
}

.modal-title {
    font-weight: 600;
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    border: none;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--gray-50);
}

.btn-close {
    background: none;
    border: none;
    color: white;
    opacity: 0.8;
}

.btn-close:hover {
    opacity: 1;
}

/* ===== Alerts & Badges ===== */
.alert {
    border: none;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

.alert-success {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(52, 211, 153, 0.1));
    color: var(--secondary-dark);
    border-left: 4px solid var(--secondary-color);
}

.alert-warning {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(251, 191, 36, 0.1));
    color: var(--warning-color);
    border-left: 4px solid var(--warning-color);
}

.alert-danger {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(248, 113, 113, 0.1));
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}

.badge {
    border-radius: var(--border-radius);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
}

/* ===== Progress Bars ===== */
.progress {
    height: 8px;
    border-radius: var(--border-radius);
    background: var(--gray-200);
    overflow: hidden;
}

.progress-bar {
    background: var(--primary-gradient);
    border-radius: var(--border-radius);
}

/* ===== Scanner Styles ===== */
#scanner-container {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    background: var(--gray-900);
    position: relative;
}

#reader {
    border-radius: var(--border-radius-lg);
}

/* ===== Chart Containers ===== */
.chart-container {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
}

/* ===== Toast Notifications ===== */
.toast {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
}

.toast-header {
    background: var(--primary-gradient);
    color: white;
    border: none;
}

.toast-body {
    background: rgba(255, 255, 255, 0.95);
    color: var(--gray-800);
}

/* ===== Animations ===== */
.page {
    animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-in;
}

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

.slide-up {
    animation: slideUp 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Stats Cards ===== */
.stats-card {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stats-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: var(--primary-gradient);
    border-radius: 50%;
    transform: translate(30px, -30px);
    opacity: 0.1;
}

.stats-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.stats-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.stats-label {
    color: var(--gray-600);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

/* ===== Utility Classes ===== */
.glass {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

.text-shadow {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .container-fluid {
        margin: var(--spacing-sm);
        border-radius: var(--border-radius);
    }
    
    .card-body {
        padding: var(--spacing-lg);
    }
    
    .btn {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
    
    .stats-card {
        margin-bottom: var(--spacing-lg);
    }
    
    .nav-pills .nav-link {
        text-align: center;
        margin-bottom: var(--spacing-xs);
    }
}

/* ===== Print Styles ===== */
@media print {
    body {
        background: white !important;
    }
    
    .no-print {
        display: none !important;
    }
    
    .container-fluid {
        box-shadow: none !important;
        background: white !important;
    }
}

/* ===== Loading States ===== */
.loading {
    position: relative;
    color: transparent !important;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== Scrollbar Styling ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
    border-radius: var(--border-radius);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: var(--border-radius);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* ===== Custom Sale Interface ===== */
.sale-interface {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.product-card {
    background: var(--gray-50);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.product-card:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.cart-item {
    background: var(--gray-50);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-left: 4px solid var(--primary-color);
}

.total-display {
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: var(--spacing-lg) 0;
}

/* ===== Dashboard Widgets ===== */
.dashboard-widget {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
    transition: var(--transition);
}

.dashboard-widget:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.widget-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--gray-100);
}

.widget-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--gray-800);
}

.widget-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

/* ===== เงินทอน - Change Amount Styling ===== */
#change-amount {
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

#change-amount.is-valid {
    background-color: #d1f2eb !important;
    border-color: #28a745 !important;
    color: #155724 !important;
    box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25) !important;
}

#change-amount.is-invalid {
    background-color: #f8d7da !important;
    border-color: #dc3545 !important;
    color: #721c24 !important;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25) !important;
}

/* เพิ่มการเปลี่ยนสีเมื่อ focus */
#change-amount.is-valid:focus {
    border-color: #28a745 !important;
    box-shadow: 0 0 0 0.3rem rgba(40, 167, 69, 0.3) !important;
}

#change-amount.is-invalid:focus {
    border-color: #dc3545 !important;
    box-shadow: 0 0 0 0.3rem rgba(220, 53, 69, 0.3) !important;
}

/* ===== Scanner Modal Styles ===== */
#scannerModal .modal-dialog {
    max-width: 600px;
}

#scannerModal .modal-content {
    border: none;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
}

#scannerModal .modal-header {
    background: var(--primary-gradient);
    border-bottom: none;
    padding: 1.5rem;
}

#scannerModal .modal-title {
    font-weight: 600;
    font-size: 1.25rem;
}

#scannerModal .modal-body {
    padding: 2rem;
    background: var(--scanner-bg);
    min-height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* Scanner Container */
#scannerModal #reader,
#scannerModal #restock-reader {
    border: 3px solid var(--primary-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: white;
}

/* Loading State */
#scanner-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

#scanner-loading .spinner-border {
    width: 3rem;
    height: 3rem;
    border-width: 0.3em;
}

/* Error State */
#scanner-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

#scanner-error .fa-exclamation-triangle {
    color: var(--danger-color);
    margin-bottom: 1rem;
}

#scanner-error h5 {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Modal Footer */
#scannerModal .modal-footer {
    background: white;
    border-top: 1px solid var(--scanner-border);
    padding: 1.5rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    #scannerModal .modal-dialog {
        margin: 0.5rem;
        max-width: calc(100% - 1rem);
        height: calc(100vh - 1rem);
        display: flex;
        align-items: center;
    }
    
    #scannerModal .modal-content {
        height: auto;
        max-height: 90vh;
    }
    
    #scannerModal .modal-body {
        padding: 1rem;
        min-height: 300px;
    }
    
    #scannerModal #reader,
    #scannerModal #restock-reader {
        max-width: 100%;
        width: 100% !important;
        height: auto !important;
    }
    
    #scannerModal .modal-footer {
        padding: 1rem;
    }
    
    #scannerModal .modal-footer .btn {
        font-size: 0.875rem;
        padding: 0.5rem 1rem;
    }
}

@media (max-width: 480px) {
    #scannerModal .modal-dialog {
        margin: 0.25rem;
        max-width: calc(100% - 0.5rem);
    }
    
    #scannerModal .modal-header {
        padding: 1rem;
    }
    
    #scannerModal .modal-title {
        font-size: 1.1rem;
    }
}

/* ===== Restock Form Enhancements ===== */
#restock-product-select {
    border-radius: var(--border-radius);
    transition: var(--transition);
}

#restock-product-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

#barcode-status {
    border-radius: var(--border-radius);
    border: none;
    font-size: 0.875rem;
}

#barcode-status.alert-success {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    border-left: 4px solid var(--success-color);
}

#barcode-status.alert-warning {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    border-left: 4px solid var(--warning-color);
}

#barcode-status.alert-info {
    background: linear-gradient(135deg, #d1ecf1 0%, #bee5eb 100%);
    border-left: 4px solid var(--info-color);
}

#no-barcode-checkbox {
    transform: scale(1.1);
    margin-right: 0.5rem;
}

#no-barcode-checkbox:checked {
    background-color: var(--info-color);
    border-color: var(--info-color);
}

#restock-name:disabled {
    background-color: var(--gray-100);
    color: var(--gray-500);
    cursor: not-allowed;
}

#restock-name:enabled {
    background-color: white;
    color: var(--gray-900);
}

.form-check-label {
    cursor: pointer;
    font-weight: 500;
}

.form-check-label:hover {
    color: var(--primary-color);
}

/* Restock form animations */
.restock-field-transition {
    transition: all 0.3s ease;
}

.restock-field-transition:disabled {
    opacity: 0.6;
    transform: scale(0.98);
}