/* ============================================
   Design Tokens & CSS Variables
   ============================================ */

:root {
  /* Colors - Light Theme */
  --color-primary: #007AFF;
  --color-secondary: #5856D6;
  --color-accent: #FF9500;
  --color-success: #34C759;
  --color-danger: #FF3B30;
  --color-warning: #FF9500;
  --color-info: #5AC8FA;
  
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F2F2F7;
  --color-bg-tertiary: #E5E5EA;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;
  
  --color-text: #000000;
  --color-text-secondary: #8E8E93;
  --color-text-tertiary: #C7C7CC;
  
  --color-border: #E5E5EA;
  --color-shadow: rgba(0, 0, 0, 0.1);
  
  /* Typography */
  --font-primary: 'Cairo', 'Heebo', 'Inter', system-ui, -apple-system, 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;
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --radius-full: 9999px;
  
  /* 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);
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* Dark Theme */
[data-theme="dark"] {
  --color-bg: #000000;
  --color-bg-secondary: #1C1C1E;
  --color-bg-tertiary: #2C2C2E;
  --color-surface: #1C1C1E;
  --color-surface-elevated: #2C2C2E;
  
  --color-text: #FFFFFF;
  --color-text-secondary: #8E8E93;
  --color-text-tertiary: #636366;
  
  --color-border: #38383A;
  --color-shadow: rgba(0, 0, 0, 0.3);
  
  --glass-bg: rgba(28, 28, 30, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
}

/* ============================================
   Reset & Base Styles
   ============================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* RTL Support */
[dir="rtl"] {
  direction: rtl;
  text-align: right;
}

[dir="ltr"] {
  direction: ltr;
  text-align: left;
}

/* ============================================
   Container & Layout
   ============================================ */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-xl);
  }
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
  gap: var(--spacing-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
}

.logo img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

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

.icon-btn {
  position: relative;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.icon-btn:hover {
  background: var(--color-bg-secondary);
  transform: scale(1.05);
}

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

.badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background: var(--color-danger);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  padding: 2px 6px;
  border-radius: var(--radius-full);
  min-width: 18px;
  text-align: center;
  line-height: 1.2;
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  padding: var(--spacing-md);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  gap: var(--spacing-sm);
}

.mobile-menu.active {
  display: flex;
}

.menu-link {
  padding: var(--spacing-md);
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.menu-link:hover {
  background: var(--color-bg-secondary);
}

/* ============================================
   Search Overlay
   ============================================ */

.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: var(--z-modal);
  display: none;
  flex-direction: column;
  padding: var(--spacing-xl);
}

.search-overlay.active {
  display: flex;
}

.search-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.search-input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.search-close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-results {
  flex: 1;
  overflow-y: auto;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  position: relative;
  width: 100%;
  height: 60vh;
  min-height: 400px;
  max-height: 600px;
  overflow: hidden;
  margin-bottom: var(--spacing-2xl);
}

.hero-slider {
  width: 100%;
  height: 100%;
  position: relative;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity var(--transition-slow);
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-slide.active {
  opacity: 1;
}

.hero-slide-content {
  text-align: center;
  color: white;
  padding: var(--spacing-xl);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--glass-border);
  max-width: 600px;
}

.hero-slide-content h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.hero-slide-content p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-lg);
}

.hero-indicators {
  position: absolute;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-sm);
}

.hero-indicator {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.5);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.hero-indicator.active {
  background: white;
  width: 32px;
  border-radius: var(--radius-md);
}

/* ============================================
   Products Grid
   ============================================ */

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.product-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.product-image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--color-bg-secondary);
}

.product-info {
  padding: var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.product-brand {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.product-price {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: auto;
}

.price-current {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.price-original {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  text-decoration: line-through;
}

.product-badge {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: var(--color-danger);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
}

/* ============================================
   Sections
   ============================================ */

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.featured-section,
.categories-section {
  padding: var(--spacing-3xl) 0;
}

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

.category-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

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

.category-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
}

.category-card h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--color-bg-secondary);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
}

.footer-section a {
  display: block;
  color: var(--color-text-secondary);
  text-decoration: none;
  margin-bottom: var(--spacing-sm);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

/* ============================================
   Chat Widget
   ============================================ */

.chat-widget {
  position: fixed;
  bottom: var(--spacing-xl);
  left: var(--spacing-xl);
  z-index: var(--z-fixed);
}

.chat-toggle {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: white;
  border: none;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.chat-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-xl);
}

.chat-container {
  position: absolute;
  bottom: 80px;
  left: 0;
  width: 350px;
  max-width: calc(100vw - 2rem);
  height: 500px;
  max-height: calc(100vh - 200px);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  display: none;
  flex-direction: column;
  overflow: hidden;
}

.chat-container.active {
  display: flex;
}

.chat-header {
  padding: var(--spacing-md);
  background: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chat-header h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.chat-close {
  background: transparent;
  border: none;
  color: white;
  font-size: var(--font-size-xl);
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.chat-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.chat-message {
  max-width: 80%;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  word-wrap: break-word;
}

.chat-message.user {
  align-self: flex-end;
  background: var(--color-primary);
  color: white;
}

.chat-message.assistant {
  align-self: flex-start;
  background: var(--color-bg-secondary);
  color: var(--color-text);
}

.chat-input-container {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.chat-input {
  flex: 1;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
}

.chat-send {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chat-send:hover {
  background: var(--color-secondary);
}

/* ============================================
   Loading Overlay
   ============================================ */

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
}

.loading-overlay.active {
  display: flex;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
}

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

/* ============================================
   Mobile-First Responsive Design
   ============================================ */

/* Base styles are for mobile (320px+) */

/* Small Mobile (320px - 479px) */
@media (max-width: 479px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .products-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .hero {
    height: 35vh;
    min-height: 250px;
  }
  
  .hero-slide-content h1 {
    font-size: var(--font-size-xl);
  }
  
  .section-title {
    font-size: var(--font-size-xl);
  }
}

/* Mobile (480px - 767px) */
@media (min-width: 480px) and (max-width: 767px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
  
  .hero {
    height: 40vh;
    min-height: 300px;
  }
  
  .hero-slide-content h1 {
    font-size: var(--font-size-2xl);
  }
}

/* Tablet (768px - 1023px) */
@media (min-width: 768px) {
  .products-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .hero {
    height: 50vh;
    min-height: 400px;
  }
  
  .chat-container {
    width: 400px;
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  }
  
  .hero {
    height: 60vh;
    min-height: 400px;
    max-height: 600px;
  }
}

/* ============================================
   Animations
   ============================================ */

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

.fade-in {
  animation: fadeIn 0.5s ease-out;
}