body {
  font-family: "Poppins", sans-serif;
  background: #f9fafc;
  color: #333;
  text-align: center;
  padding: 20px;
}

header h1 {
  color: #6c63ff;
  margin-bottom: 30px;
}

.bmi-app {
  background: white;
  padding: 20px;
  max-width: 400px;
  margin: 0 auto;
  border-radius: 15px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.input-section {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 20px;
}

input[type="number"] {
  padding: 10px;
  border-radius: 25px;
  border: 1px solid #ccc;
  font-size: 1rem;
}

button {
  padding: 10px 20px;
  border-radius: 25px;
  border: none;
  background: #6c63ff;
  color: white;
  cursor: pointer;
  transition: 0.3s;
}

button:hover {
  background: #ffcc70;
  color: #333;
}

#result {
  margin-top: 20px;
  font-size: 1.2rem;
  font-weight: bold;
  padding: 15px;
  border-radius: 15px;
}