/**
 * Amma Food Center - Main Stylesheet
 * Mobile-first, GPU-safe animations, 2026-grade UI
 */

/* ============================================
   CSS Custom Properties (Theme)
   ============================================ */
:root {
    /* Brand Colors */
    --primary: #ff6b35;
    --primary-dark: #e55a2b;
    --primary-light: #ff8c5a;
    --secondary: #2d3436;
    --accent: #00b894;
    
    /* Neutrals */
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #f1f3f4;
    --gray-200: #e8eaed;
    --gray-300: #dadce0;
    --gray-400: #bdc1c6;
    --gray-500: #9aa0a6;
    --gray-600: #80868b;
    --gray-700: #5f6368;
    --gray-800: #3c4043;
    --gray-900: #202124;
    
    /* Status Colors */
    --success: #00b894;
    --warning: #fdcb6e;
    --error: #e74c3c;
    --info: #74b9ff;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 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);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Layout */
    --header-height: 60px;
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
    min-height: 100vh;
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.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;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    height: var(--header-height);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 700;
    font-size: var(--font-size-xl);
    color: var(--primary);
}

.header__logo-icon {
    font-size: var(--font-size-2xl);
}

.header__cart {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-full);
    font-weight: 600;
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.header__cart:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.header__cart-count {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    background: var(--white);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 700;
}

/* ============================================
   Hero / Announcement Section
   ============================================ */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: var(--space-8) 0;
    min-height: 200px;
    display: flex;
    align-items: center;
}

.hero__content {
    text-align: center;
}

.hero__title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin-bottom: var(--space-2);
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
}

.announcement {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-top: var(--space-6);
}

.announcement__text {
    font-size: var(--font-size-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

/* ============================================
   Menu Section
   ============================================ */
.menu-section {
    padding: var(--space-8) 0;
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-6);
    text-align: center;
}

.category-tabs {
    display: flex;
    gap: var(--space-2);
    overflow-x: auto;
    padding-bottom: var(--space-4);
    margin-bottom: var(--space-6);
    scrollbar-width: none;
    -ms-overflow-style: none;
}

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

.category-tab {
    padding: var(--space-2) var(--space-4);
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-full);
    font-weight: 500;
    color: var(--gray-600);
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.category-tab:hover,
.category-tab.active {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(255, 107, 53, 0.05);
}

.category-tab.active {
    background: var(--primary);
    color: var(--white);
}

/* Menu Grid */
.menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-6);
}

/* Menu Card */
.menu-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.menu-card__image {
    aspect-ratio: 16/10;
    overflow: hidden;
    background: var(--gray-100);
}

.menu-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.menu-card:hover .menu-card__image img {
    transform: scale(1.05);
}

.menu-card__placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    color: var(--gray-400);
    font-size: 3rem;
}

.menu-card__body {
    padding: var(--space-4);
}

.menu-card__category {
    font-size: var(--font-size-xs);
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-1);
}

.menu-card__name {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.menu-card__description {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    margin-bottom: var(--space-4);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.menu-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.menu-card__price {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--gray-900);
}

.menu-card__price-symbol {
    font-size: var(--font-size-base);
    font-weight: 600;
}

.btn-add {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: var(--font-size-sm);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-add:hover {
    background: var(--primary-dark);
}

.btn-add:active {
    transform: scale(0.95);
}

.btn-add.added {
    background: var(--success);
}

/* Quantity Controls (when item in cart) */
.qty-controls {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.qty-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    font-weight: 700;
    color: var(--gray-700);
    transition: background var(--transition-fast);
}

.qty-btn:hover {
    background: var(--gray-200);
}

.qty-btn.minus:hover {
    background: var(--error);
    color: var(--white);
}

.qty-btn.plus:hover {
    background: var(--primary);
    color: var(--white);
}

.qty-value {
    min-width: 24px;
    text-align: center;
    font-weight: 700;
}

/* ============================================
   Cart Sidebar / Modal
   ============================================ */
.cart-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 200;
}

.cart-overlay.active {
    opacity: 1;
    visibility: visible;
}

.cart-sidebar {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 400px;
    background: var(--white);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    z-index: 201;
    display: flex;
    flex-direction: column;
}

.cart-sidebar.active {
    transform: translateX(0);
}

.cart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    border-bottom: 1px solid var(--gray-200);
}

.cart-header__title {
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.cart-header__close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xl);
    color: var(--gray-600);
    transition: background var(--transition-fast);
}

.cart-header__close:hover {
    background: var(--gray-100);
}

.cart-items {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4);
}

.cart-empty {
    text-align: center;
    padding: var(--space-8);
    color: var(--gray-500);
}

.cart-empty__icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
}

.cart-item {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3);
}

.cart-item__image {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--gray-200);
}

.cart-item__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.cart-item__details {
    flex: 1;
    min-width: 0;
}

.cart-item__name {
    font-weight: 600;
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cart-item__price {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
}

.cart-item__qty {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-2);
}

.cart-item__remove {
    color: var(--error);
    font-size: var(--font-size-xs);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.cart-item__remove:hover {
    background: rgba(231, 76, 60, 0.1);
}

.cart-footer {
    border-top: 1px solid var(--gray-200);
    padding: var(--space-4);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.btn-checkout {
    width: 100%;
    padding: var(--space-4);
    background: var(--success);
    color: var(--white);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-checkout:hover {
    background: #00a383;
}

.btn-checkout:active {
    transform: scale(0.98);
}

.btn-checkout:disabled {
    background: var(--gray-400);
    cursor: not-allowed;
}

/* ============================================
   Checkout Modal
   ============================================ */
.checkout-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 300;
}

.checkout-modal.active {
    opacity: 1;
    visibility: visible;
}

.checkout-modal__content {
    background: var(--white);
    border-radius: var(--radius-2xl);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-base);
}

.checkout-modal.active .checkout-modal__content {
    transform: scale(1) translateY(0);
}

.checkout-modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--gray-200);
}

.checkout-modal__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.checkout-modal__close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--gray-600);
    font-size: var(--font-size-lg);
    transition: background var(--transition-fast);
}

.checkout-modal__close:hover {
    background: var(--gray-100);
}

.checkout-modal__body {
    padding: var(--space-6);
}

.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--gray-700);
}

.form-label span {
    color: var(--error);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.form-input::placeholder {
    color: var(--gray-400);
}

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

.order-summary {
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-5);
}

.order-summary__title {
    font-weight: 700;
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.order-summary__item {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
    padding: var(--space-2) 0;
    border-bottom: 1px dashed var(--gray-200);
}

.order-summary__item:last-child {
    border-bottom: none;
}

.order-summary__total {
    display: flex;
    justify-content: space-between;
    font-weight: 700;
    font-size: var(--font-size-lg);
    padding-top: var(--space-3);
    margin-top: var(--space-3);
    border-top: 2px solid var(--gray-200);
}

.btn-whatsapp {
    width: 100%;
    padding: var(--space-4);
    background: #25D366;
    color: var(--white);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.btn-whatsapp:hover {
    background: #1da851;
}

.btn-whatsapp:active {
    transform: scale(0.98);
}

.btn-whatsapp:disabled {
    background: var(--gray-400);
    cursor: not-allowed;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--space-8) 0;
    margin-top: var(--space-12);
}

.footer__inner {
    text-align: center;
}

.footer__logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--space-4);
}

.footer__text {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-2);
}

.footer__copyright {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    margin-top: var(--space-4);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
    position: fixed;
    bottom: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    z-index: 400;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    pointer-events: none;
}

.toast {
    background: var(--gray-900);
    color: var(--white);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
    pointer-events: auto;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--error);
}

/* ============================================
   Loading Spinner
   ============================================ */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 500;
}

/* ============================================
   Media Queries
   ============================================ */
@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }
    
    .hero__title {
        font-size: var(--font-size-2xl);
    }
    
    .menu-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: var(--space-4);
    }
    
    .cart-sidebar {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-3);
    }
    
    .header__logo-text {
        display: none;
    }
    
    .menu-grid {
        grid-template-columns: 1fr;
    }
    
    .checkout-modal__body {
        padding: var(--space-4);
    }
}

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

/* Low memory devices - disable animations */
.low-memory * {
    animation: none !important;
    transition: none !important;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .header,
    .cart-overlay,
    .cart-sidebar,
    .checkout-modal,
    .btn-add,
    .btn-checkout,
    .toast-container {
        display: none !important;
    }
    
    body {
        background: white;
    }
}