body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(135deg, #38598b, #fd5959);
  color: #fff;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  background: rgba(0, 0, 0, 0.25);
  padding: 30px;
  border-radius: 12px;
}

h1 {
  text-align: center;
  margin-bottom: 25px;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

button {
  padding: 12px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  background: #00e5ff;
  color: #000;
  transition: 0.3s;
}

button:hover {
  background: #00bcd4;
  transform: scale(1.05);
}

.output-box {
  margin-top: 25px;
  padding: 20px;
  min-height: 80px;
  background: #d5eeff;
  color: #000;
  border-radius: 8px;
  font-size: 16px;
}