* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f7f7f9;
  color: #1f2937;
}

.site-header {
  background: #111827;
  color: #ffffff;
  padding: 32px 16px;
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: 32px;
}

.site-header p {
  margin: 0;
  opacity: 0.9;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px;
}

.layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  align-items: start;
}

.section-title-row {
  margin-bottom: 16px;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.product-card,
.cart-card {
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.product-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.product-body {
  padding: 16px;
}

.product-body h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 20px;
}

.product-description {
  min-height: 48px;
  color: #4b5563;
  margin-bottom: 12px;
}

.product-price {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.product-stock {
  margin-bottom: 16px;
  font-weight: 600;
}

.stock-ok {
  color: #166534;
}

.stock-empty {
  color: #b91c1c;
}

.add-to-cart-button,
.checkout-button,
.qty-button,
.remove-button {
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
}

.add-to-cart-button,
.checkout-button {
  width: 100%;
  padding: 12px 16px;
  background: #111827;
  color: white;
  font-weight: 700;
}

.add-to-cart-button:disabled,
.checkout-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.cart-card {
  padding: 20px;
  position: sticky;
  top: 24px;
}

.cart-card h2 {
  margin-top: 0;
}

.cart-items {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}

.cart-item {
  display: grid;
  gap: 10px;
  padding-bottom: 16px;
  border-bottom: 1px solid #e5e7eb;
}

.cart-item-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cart-item-info span {
  color: #6b7280;
  font-size: 14px;
}

.cart-item-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.qty-button {
  width: 32px;
  height: 32px;
  background: #e5e7eb;
  color: #111827;
  font-weight: 700;
}

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

.cart-item-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.remove-button {
  background: transparent;
  color: #b91c1c;
  padding: 0;
}

.cart-summary {
  border-top: 1px solid #e5e7eb;
  padding-top: 16px;
  margin-bottom: 16px;
}

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

.empty-cart {
  color: #6b7280;
  margin: 0;
}

.message-box {
  margin-bottom: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  font-weight: 600;
}

.message-box.error {
  background: #fee2e2;
  color: #991b1b;
}

.message-box.hidden {
  display: none;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .cart-card {
    position: static;
  }
}