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

:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-active: #1e40af;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --background: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* Header */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.cart-summary {
  background: var(--primary-color);
  color: white;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 32px 0;
}

.marketplace-grid {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 24px;
  align-items: start;
}

/* Section Headers */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.section-header h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

/* Filter Controls */
.filter-controls {
  display: flex;
  gap: 12px;
}

.filter-select {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-select:hover {
  border-color: var(--primary-color);
}

.filter-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Products Section */
.products-section {
  min-height: 500px;
}

.loader {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
  font-size: 16px;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.product-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.product-image {
  width: 100%;
  height: 240px;
  object-fit: contain;
  padding: 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.product-info {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-category {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.product-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.product-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
}

.product-price {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
  transform: scale(1.02);
}

.btn-primary:active {
  background: var(--primary-active);
  transform: scale(0.98);
}

.btn-primary:disabled {
  background: var(--secondary-color);
  cursor: not-allowed;
  transform: none;
}

.btn-danger {
  background: var(--danger-color);
  color: white;
  padding: 6px 12px;
  font-size: 12px;
}

.btn-danger:hover {
  background: var(--danger-hover);
}

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

.btn-checkout {
  width: 100%;
  padding: 16px;
  font-size: 16px;
  background: var(--success-color);
}

.btn-checkout:hover {
  background: #059669;
}

/* Cart Section */
.cart-section {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 100px;
  max-height: calc(100vh - 120px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.cart-content {
  flex: 1;
  overflow-y: auto;
  margin-bottom: 20px;
  min-height: 200px;
}

.empty-cart {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-secondary);
}

.empty-cart-icon {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.3;
}

.empty-cart p {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.empty-cart small {
  font-size: 14px;
  color: var(--text-secondary);
}

.cart-items {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cart-item {
  display: flex;
  gap: 16px;
  padding: 16px;
  background: var(--background);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.cart-item:hover {
  box-shadow: var(--shadow-sm);
}

.cart-item-image {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  background: var(--surface);
  padding: 8px;
}

.cart-item-details {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cart-item-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.cart-item-price {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary-color);
}

.cart-item-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.quantity-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 4px;
}

.quantity-btn {
  width: 28px;
  height: 28px;
  border: none;
  background: var(--primary-color);
  color: white;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  transition: var(--transition);
}

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

.quantity-btn:active {
  transform: scale(0.9);
}

.quantity-value {
  min-width: 32px;
  text-align: center;
  font-weight: 600;
  font-size: 14px;
}

/* Cart Total */
.cart-total {
  border-top: 2px solid var(--border);
  padding-top: 20px;
}

.cart-total.hidden {
  display: none;
}

.cart-summary-details {
  margin-bottom: 20px;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.summary-row.total {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  padding-top: 12px;
  border-top: 1px solid var(--border);
  margin-top: 8px;
}

.summary-row.total span:last-child {
  color: var(--primary-color);
}

/* Footer */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 14px;
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--text-primary);
  color: white;
  padding: 16px 24px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-xl);
  transform: translateY(100px);
  opacity: 0;
  transition: var(--transition);
  z-index: 1000;
  font-size: 14px;
  font-weight: 500;
}

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

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

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

/* Responsive Design */
@media (max-width: 1024px) {
  .marketplace-grid {
    grid-template-columns: 1fr;
  }

  .cart-section {
    position: static;
    max-height: none;
  }

  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
}

@media (max-width: 768px) {
  .header .container {
    flex-direction: column;
    gap: 12px;
  }

  .logo {
    font-size: 20px;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
  }

  .product-image {
    height: 180px;
  }

  .cart-item {
    flex-direction: column;
  }

  .cart-item-image {
    width: 100%;
    height: 150px;
  }
}

@media (max-width: 480px) {
  .products-grid {
    grid-template-columns: 1fr;
  }

  .product-footer {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary {
    width: 100%;
  }

  .toast {
    left: 20px;
    right: 20px;
  }
}

/* Scrollbar Styling */
.cart-content::-webkit-scrollbar {
  width: 8px;
}

.cart-content::-webkit-scrollbar-track {
  background: var(--background);
  border-radius: 4px;
}

.cart-content::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

.cart-content::-webkit-scrollbar-thumb:hover {
  background: var(--secondary-color);
}