:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #64748b;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --bg-light: #f8fafc;
  --card-bg: #ffffff;
  --text-dark: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --radius: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-light);
  color: var(--text-dark);
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}

.navbar {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-item {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
}

.cart-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: #eff6ff;
  padding: 0.5rem 0.75rem;
  border-radius: 20px;
  color: var(--primary);
}

.cart-badge {
  background-color: var(--primary);
  color: white;
  border-radius: 50%;
  padding: 0.1rem 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
}

.page-content {
  flex: 1;
  padding: 2rem 1rem;
}

.alert {
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.alert-info {
  background-color: #dbeafe;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}

.alert-danger {
  background-color: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.catalog-header, .cart-header {
  margin-bottom: 2rem;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.5rem;
}

.product-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.product-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.product-image-placeholder, .product-image-large {
  background-color: #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 180px;
  font-weight: 600;
  color: var(--text-muted);
}

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

.product-title {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.product-title a {
  color: var(--text-dark);
  text-decoration: none;
}

.product-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  flex: 1;
  margin-bottom: 1rem;
}

.product-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
}

.product-price {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
}

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-align: center;
}

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

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

.btn-outline {
  border-color: var(--primary);
  color: var(--primary);
  background: transparent;
}

.btn-outline:hover {
  background-color: #eff6ff;
}

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

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

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

.btn-disabled {
  background-color: #cbd5e1;
  color: #64748b;
  cursor: not-allowed;
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

.full-width {
  width: 100%;
}

.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px dashed var(--border-color);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.empty-state h2 {
  margin-bottom: 0.5rem;
}

.empty-state p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.product-detail-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  padding: 2rem;
  margin-top: 1rem;
}

@media (max-width: 768px) {
  .product-detail-card {
    grid-template-columns: 1fr;
  }
}

.breadcrumb {
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
}

.product-price-large {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  margin: 1rem 0;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.form-control {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 1rem;
}

.qty-input {
  width: 100px;
}

.qty-input-sm {
  width: 70px;
  display: inline-block;
}

.cart-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
}

@media (max-width: 768px) {
  .cart-layout {
    grid-template-columns: 1fr;
  }
}

.cart-table-wrapper {
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  overflow-x: auto;
}

.cart-table {
  width: 100%;
  border-collapse: collapse;
}

.cart-table th, .cart-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.cart-table th {
  background-color: #f1f5f9;
  font-weight: 600;
}

.item-title {
  font-weight: 600;
  display: block;
}

.item-variant {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.item-subtotal {
  font-weight: 700;
}

.cart-summary-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  height: fit-content;
}

.summary-line {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.total-line {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  font-size: 1.2rem;
}

.summary-actions {
  margin-top: 1.5rem;
}

.update-qty-form {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
  text-align: center;
  color: var(--text-muted);
  margin-top: 3rem;
}