:root {
  --primary: #3b82f6;
  --secondary: #10b981;
  --accent: #f59e0b;
  --danger: #ef4444;
  --dark: #1f2937;
  --darker: #111827;
  --light: #ffffff;
  --gray: #6b7280;
  --gray-light: #d1d5db;
  --gray-bg: #f9fafb;
  
  --font-primary: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  
  --radius: 0.75rem;
  --radius-sm: 0.375rem;
  --radius-lg: 1.5rem;
  
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
  
  --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent) 0%, var(--danger) 100%);
}

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

body {
  font-family: var(--font-primary);
  background: var(--gray-bg);
  color: var(--dark);
  line-height: 1.6;
}

.ecommerce-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.main-header {
  background: var(--light);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.logo-icon {
  font-size: 1.5rem;
}

.logo-text {
  font-weight: 800;
  font-size: 1.25rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.search-container {
  flex: 1;
  max-width: 500px;
  position: relative;
  display: flex;
}

.search-input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-light);
  border-radius: var(--radius) 0 0 var(--radius);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-btn {
  padding: 0.75rem 1rem;
  background: var(--gradient-primary);
  border: none;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--light);
  cursor: pointer;
  transition: all 0.3s ease;
}

.search-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.action-btn {
  position: relative;
  padding: 0.75rem;
  background: transparent;
  border: 2px solid var(--gray-light);
  border-radius: var(--radius);
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.action-btn:hover {
  border-color: var(--primary);
  background: rgba(59, 130, 246, 0.1);
}

.badge {
  position: absolute;
  top: -5px;
  right: -5px;
  background: var(--danger);
  color: var(--light);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.4rem;
  border-radius: 50px;
  min-width: 18px;
  text-align: center;
}

/* Navigation */
.main-nav {
  background: var(--light);
  border-top: 1px solid var(--gray-light);
  padding: var(--spacing-sm) 0;
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
}

.nav-categories {
  display: flex;
  gap: var(--spacing-xs);
}

.nav-category {
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  color: var(--gray);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

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

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

.filter-select {
  padding: 0.5rem 1rem;
  border: 1px solid var(--gray-light);
  border-radius: var(--radius);
  background: var(--light);
  cursor: pointer;
}

.price-filter {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.9rem;
}

#priceRange {
  width: 100px;
}

/* Main Content */
.main-content {
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-md);
  width: 100%;
}

/* Hero Banner */
.hero-banner {
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  color: var(--light);
  overflow: hidden;
  position: relative;
}

.hero-banner::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
  opacity: 0.3;
}

.banner-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

.banner-subtitle {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.9;
}

.banner-cta {
  padding: 1rem 2rem;
  background: var(--light);
  color: var(--primary);
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

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

.banner-image {
  position: relative;
  z-index: 1;
}

.banner-image img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius);
}

/* Products Section */
.products-section {
  margin-bottom: var(--spacing-lg);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--dark);
}

.view-toggle {
  display: flex;
  gap: var(--spacing-xs);
}

.view-btn {
  padding: 0.5rem;
  background: transparent;
  border: 1px solid var(--gray-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
}

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

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

.products-grid.list-view {
  grid-template-columns: 1fr;
}

.product-card {
  background: var(--light);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.product-image {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.product-card:hover .product-image img {
  transform: scale(1.1);
}

.product-badge {
  position: absolute;
  top: var(--spacing-xs);
  left: var(--spacing-xs);
  background: var(--danger);
  color: var(--light);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
}

.product-actions {
  position: absolute;
  top: var(--spacing-xs);
  right: var(--spacing-xs);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.product-card:hover .product-actions {
  opacity: 1;
}

.action-icon {
  width: 40px;
  height: 40px;
  background: var(--light);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
}

.action-icon:hover {
  background: var(--primary);
  color: var(--light);
}

.product-content {
  padding: var(--spacing-sm);
}

.product-category {
  font-size: 0.8rem;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.product-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--dark);
}

.product-rating {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

.stars {
  color: var(--accent);
}

.rating-text {
  font-size: 0.8rem;
  color: var(--gray);
}

.product-price {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.price {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.old-price {
  font-size: 0.9rem;
  color: var(--gray);
  text-decoration: line-through;
}

.add-to-cart {
  width: 100%;
  padding: 0.75rem;
  background: var(--gradient-primary);
  color: var(--light);
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.add-to-cart:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.load-more {
  text-align: center;
}

.load-more-btn {
  padding: 1rem 2rem;
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.load-more-btn:hover {
  background: var(--primary);
  color: var(--light);
}

/* Cart Sidebar */
.cart-sidebar {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100vh;
  background: var(--light);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transition: right 0.3s ease;
  display: flex;
  flex-direction: column;
}

.cart-sidebar.open {
  right: 0;
}

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

.cart-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.close-cart {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray);
}

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

.empty-cart {
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--gray);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  display: block;
}

.cart-item {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--gray-light);
}

.cart-item-image {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

.cart-item-details {
  flex: 1;
}

.cart-item-name {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

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

.quantity-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.quantity-btn {
  width: 24px;
  height: 24px;
  background: var(--gray-light);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cart-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--gray-light);
}

.cart-total {
  margin-bottom: var(--spacing-sm);
  text-align: center;
  font-size: 1.1rem;
}

.checkout-btn {
  width: 100%;
  padding: 1rem;
  background: var(--gradient-primary);
  color: var(--light);
  border: none;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.checkout-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

/* Modal */
.product-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.product-modal.open {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--light);
  border-radius: var(--radius-lg);
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  margin: var(--spacing-md);
}

.close-modal {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: var(--gray-light);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  z-index: 1;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.overlay.open {
  opacity: 1;
  visibility: visible;
}

/* Back Button */
.back-button {
  position: fixed;
  bottom: var(--spacing-md);
  left: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--gradient-primary);
  color: var(--light);
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 600;
  transition: all 0.3s ease;
  z-index: 1000;
}

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

/* Responsive */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .nav-container {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .nav-filters {
    flex-direction: column;
    align-items: stretch;
  }
  
  .hero-banner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
  
  .cart-sidebar {
    width: 100%;
    right: -100%;
  }
}