body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to right, #83a4d4, #b6fbff);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.calculator {
  background: #ffffff;
  padding: 25px;
  border-radius: 20px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  width: 300px;
  transition: transform 0.3s ease;
}

.calculator:hover {
  transform: scale(1.03);
}

#display {
  width: 100%;
  height: 60px;
  font-size: 28px;
  text-align: right;
  margin-bottom: 20px;
  padding: 12px;
  border: none;
  border-radius: 15px;
  background-color: #f0f0f0;
  box-shadow: inset 0 2px 5px rgba(0,0,0,0.1);
  box-sizing: border-box;
}


.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

button {
  padding: 20px;
  font-size: 20px;
  border: none;
  border-radius: 15px;
  background: #e0f7fa;
  color: #333;
  cursor: pointer;
  transiti