/* Reset dasar */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Helvetica, Arial, sans-serif;
}

body {
  background: #f4f6f9;
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: #fff;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  max-width: 420px;
  width: 100%;
  text-align: center;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: #2c3e50;
}

.price {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
}

.input-box {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.input-box label {
  font-size: 0.9rem;
  align-self: center;
}

input[type="number"] {
  padding: 0.5rem;
  font-size: 1rem;
  border-radius: 8px;
  border: 1px solid #ccc;
  outline: none;
  width: 120px;
  transition: 0.3s;
}

input[type="number"]:focus {
  border-color: #007bff;
  box-shadow: 0 0 6px rgba(0, 123, 255, 0.4);
}

button {
  background: #007bff;
  border: none;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  color: white;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.3s;
}

button:hover {
  background: #0056b3;
}

.output {
  margin-top: 1rem;
  font-size: 1rem;
  background: #f9fafc;
  padding: 0.8rem;
  border-radius: 10px;
  min-height: 30px;
  text-align: left;
}