body {
  font-family: Arial, sans-serif;
  background: #f5f6fa;
  margin: 0;
  padding: 40px;
  color: #333;
}

h2 {
  text-align: center;
  color: #222;
}

button {
  background: #2563eb;
  color: white;
  border: none;
  padding: 10px 16px;
  margin: 6px;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

input {
  padding: 10px;
  width: 260px;
  border: 1px solid #ccc;
  border-radius: 6px;
}

#list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

#list > div,
#detail,
#cart > div {
  background: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 3px 10px rgba(0,0,0,0.08);
}

#detail {
  max-width: 500px;
  margin: 30px auto;
}

#cart {
  max-width: 700px;
  margin: 30px auto;
}

#total {
  text-align: center;
  color: #111;
}