body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  padding: 1rem;
  background: #333;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#search {
  padding: 0.5rem;
  font-size: 1rem;
}

#tabbar {
  background: #f4f4f4;
  padding: 0.5rem;
  display: flex;
  gap: 1rem;
  overflow-x: auto;
}

.tab {
  padding: 0.5rem 1rem;
  background: #ddd;
  border: none;
  cursor: pointer;
}

.tab.active {
  background: #333;
  color: white;
}

#shop-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1rem;
}

.item-card {
  border: 1px solid #ccc;
  width: 200px;
  padding: 1rem;
  text-align: center;
  background: #fff;
}

.item-card img {
  max-width: 100%;
  height: auto;
}

.buy-box {
  margin-top: 0.5rem;
  padding: 0.5rem;
  background: #28a745;
  color: white;
  cursor: pointer;
  border: none;
}

.buy-box.disabled {
  background: #ccc;
  cursor: not-allowed;
}