/**
 * File Location: /css/main.css
 * File Name: main.css
 * Functions: Main stylesheet for PAPYON restaurant system
 * Version: 3.0.0
 * 
 * Change History:
 * v3.0.0 - 2026-02-15 - Modern grayscale design with light gray background
 * v2.0.0 - 2026-02-14 - Bootstrap integration
 * v1.0.0 - 2026-02-01 - Initial creation
 */

/* ============================================
   ROOT VARIABLES - GRAYSCALE PALETTE
   ============================================ */
:root {
    /* Grayscale Colors */
    --color-white: #FFFFFF;
    --color-bg-light: #F5F5F7;
    --color-bg-lighter: #FAFAFA;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    --color-black: #000000;
    
    /* Semantic Colors */
    --color-primary: #2D3748;
    --color-primary-hover: #1A202C;
    --color-secondary: #4A5568;
    --color-accent: #718096;
    
    /* Status Colors (Grayscale) */
    --color-success: #4B5563;
    --color-warning: #6B7280;
    --color-danger: #374151;
    --color-info: #9CA3AF;
    
    /* 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);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ============================================
   GLOBAL STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg-light);
    color: var(--color-gray-900);
    line-height: 1.6;
    min-height: 100vh;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-700);
}

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

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

/* ============================================
   LAYOUT COMPONENTS
   ============================================ */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-md);
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition-base);
}

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

.card-header {
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-gray-100);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin: 0;
}

.card-body {
    padding: 0;
}

.card-footer {
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray-100);
}

/* ============================================
   PRODUCT CARD
   ============================================ */
.product-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-gray-900);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.product-card:hover {
    border-color: var(--color-gray-400);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

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

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

.product-card-header {
    margin-bottom: var(--spacing-md);
}

.product-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.product-description {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    line-height: 1.5;
    margin-bottom: 0;
}

.product-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-gray-900);
}

.product-price-from {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-gray-500);
    margin-right: var(--spacing-xs);
}

.btn-add-to-cart {
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.btn-add-to-cart:hover {
    transform: scale(1.05);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1.5;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background: var(--color-gray-900);
    color: var(--color-white);
    border-color: var(--color-gray-900);
}

.btn-primary:hover {
    background: var(--color-gray-800);
    border-color: var(--color-gray-800);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-gray-600);
    color: var(--color-white);
    border-color: var(--color-gray-600);
}

.btn-secondary:hover {
    background: var(--color-gray-700);
    border-color: var(--color-gray-700);
}

.btn-outline {
    background: transparent;
    color: var(--color-gray-900);
    border-color: var(--color-gray-300);
}

.btn-outline:hover {
    background: var(--color-gray-100);
    border-color: var(--color-gray-400);
}

.btn-ghost {
    background: transparent;
    color: var(--color-gray-700);
    border-color: transparent;
}

.btn-ghost:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-900);
}

.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1.0625rem;
}

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

.btn-icon {
    padding: 0.625rem;
    width: 2.5rem;
    height: 2.5rem;
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--color-gray-700);
    font-size: 0.9375rem;
}

.form-control {
    width: 100%;
    padding: 0.625rem 0.875rem;
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-gray-900);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.form-control:disabled {
    background-color: var(--color-gray-100);
    cursor: not-allowed;
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    margin: 0;
    cursor: pointer;
    accent-color: var(--color-gray-900);
}

.form-check-label {
    margin: 0;
    cursor: pointer;
    user-select: none;
    color: var(--color-gray-700);
}

/* ============================================
   INGREDIENT SELECTION
   ============================================ */
.ingredients-section {
    margin-top: var(--spacing-xl);
}

.ingredients-group {
    margin-bottom: var(--spacing-xl);
}

.ingredients-group-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-gray-200);
}

.ingredient-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.ingredient-item:hover {
    background: var(--color-gray-100);
}

.ingredient-item.required {
    background: var(--color-gray-100);
    border-left: 3px solid var(--color-gray-900);
}

.ingredient-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.ingredient-name {
    font-weight: 500;
    color: var(--color-gray-900);
}

.ingredient-price {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-left: auto;
}

.ingredient-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    background: var(--color-gray-200);
    color: var(--color-gray-700);
}

/* ============================================
   VARIANT SELECTION
   ============================================ */
.variant-set {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-gray-200);
}

.variant-set-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
}

.variant-set-required {
    color: var(--color-gray-600);
    font-size: 0.875rem;
    font-weight: 400;
}

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

.variant-options-radio,
.variant-options-checkbox {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.variant-option {
    position: relative;
    padding: var(--spacing-md);
    background: var(--color-white);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.variant-option:hover {
    border-color: var(--color-gray-400);
    box-shadow: var(--shadow-md);
}

.variant-option.selected {
    border-color: var(--color-gray-900);
    background: var(--color-gray-50);
}

.variant-option-name {
    font-weight: 500;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.variant-option-price {
    font-size: 0.875rem;
    color: var(--color-gray-600);
}

/* Modal improvements */
.modal-content {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.modal-header {
    border-bottom: 2px solid var(--color-gray-100);
    padding: var(--spacing-lg) var(--spacing-xl);
}

.modal-body {
    padding: var(--spacing-xl);
    max-height: 70vh;
    overflow-y: auto;
}

.modal-footer {
    border-top: 2px solid var(--color-gray-100);
    padding: var(--spacing-lg) var(--spacing-xl);
}

.modal.fade .modal-dialog {
    transition: transform 0.3s ease-out;
}

.modal.show .modal-dialog {
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        transform: scale(0.9) translateY(-20px);
        opacity: 0;
    }
    to {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

/* ============================================
   CART
   ============================================ */
.cart-container {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-lg);
    max-width: 480px;
    width: 100%;
}

.cart-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
}

.cart-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-gray-900);
    margin: 0;
}

.cart-items {
    max-height: 60vh;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.cart-item {
    padding: var(--spacing-md);
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.cart-item-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-sm);
}

.cart-item-name {
    font-weight: 600;
    color: var(--color-gray-900);
}

.cart-item-price {
    font-weight: 600;
    color: var(--color-gray-900);
}

.cart-item-details {
    font-size: 0.875rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-sm);
}

.cart-item-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

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

.quantity-btn {
    width: 2rem;
    height: 2rem;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
}

.quantity-display {
    min-width: 3rem;
    text-align: center;
    font-weight: 600;
}

.cart-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-200);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   ORDER MODAL
   ============================================ */
.order-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-white);
    z-index: 9999;
    display: flex;
    flex-direction: column;
}

.order-modal-header {
    padding: var(--spacing-xl);
    background: var(--color-gray-900);
    color: var(--color-white);
    text-align: center;
}

.order-id {
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-mono);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.5rem;
}

.order-modal-body {
    flex: 1;
    padding: var(--spacing-xl);
    overflow-y: auto;
    text-align: center;
}

.order-status {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-gray-100);
    border-radius: var(--radius-xl);
    font-size: 1.5rem;
    font-weight: 600;
    margin: var(--spacing-2xl) 0;
}

.status-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 1rem;
    font-weight: 600;
}

.status-registered {
    background: var(--color-gray-300);
    color: var(--color-gray-800);
}

.status-processing {
    background: var(--color-gray-600);
    color: var(--color-white);
}

.status-ready {
    background: var(--color-gray-900);
    color: var(--color-white);
}

.status-completed {
    background: var(--color-gray-400);
    color: var(--color-gray-900);
}

.status-cancelled {
    background: var(--color-gray-200);
    color: var(--color-gray-700);
}

.order-contact {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-xl);
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
}

.order-modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--color-gray-200);
}

/* ============================================
   BADGES & TAGS
   ============================================ */
.badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 500;
    line-height: 1;
    border-radius: var(--radius-full);
}

.badge-primary {
    background: var(--color-gray-900);
    color: var(--color-white);
}

.badge-secondary {
    background: var(--color-gray-200);
    color: var(--color-gray-800);
}

.badge-outline {
    background: transparent;
    border: 1px solid var(--color-gray-300);
    color: var(--color-gray-700);
}

/* ============================================
   ALLERGEN TAGS
   ============================================ */
.allergens {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.allergen-tag {
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--color-gray-200);
    color: var(--color-gray-700);
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

/* ============================================
   LOADING STATES
   ============================================ */
.spinner {
    display: inline-block;
    width: 1.5rem;
    height: 1.5rem;
    border: 3px solid var(--color-gray-200);
    border-top-color: var(--color-gray-900);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.spinner-lg {
    width: 3rem;
    height: 3rem;
    border-width: 4px;
}

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 25%,
        var(--color-gray-100) 50%,
        var(--color-gray-200) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.loading-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.loading-spinner {
    background: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    text-align: center;
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    background: var(--color-white);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    max-width: 500px;
    pointer-events: all;
    animation: slideInRight 0.3s ease;
    border-left: 4px solid var(--color-gray-900);
}

.toast.success {
    border-left-color: var(--color-gray-900);
}

.toast.error {
    border-left-color: var(--color-gray-700);
    background: #fee;
}

.toast.info {
    border-left-color: var(--color-gray-600);
}

.toast-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
    font-weight: 500;
    color: var(--color-gray-900);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* ============================================
   UTILITIES
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.fw-light { font-weight: 300; }
.fw-normal { font-weight: 400; }
.fw-medium { font-weight: 500; }
.fw-semibold { font-weight: 600; }
.fw-bold { font-weight: 700; }

.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }

.text-gray-500 { color: var(--color-gray-500); }
.text-gray-600 { color: var(--color-gray-600); }
.text-gray-700 { color: var(--color-gray-700); }
.text-gray-900 { color: var(--color-gray-900); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.flex-column { flex-direction: column; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.justify-content-center { justify-content: center; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .variant-options {
        grid-template-columns: 1fr;
    }
    
    .cart-container {
        max-width: 100%;
        border-radius: 0;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    body {
        background: white;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--color-gray-300);
    }
    
    .btn {
        display: none;
    }
}