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

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: linear-gradient(135deg, #89f7fe, #66a6ff);
}

.calculator {
  background: #222;
  padding: 20px;
  border-radius: 20px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.25);
  width: 90%;
  max-width: 400px;
}

.display {
  width: 100%;
  height: 70px;
  background: #333;
  border: none;
  border-radius: 10px;
  margin-bottom: 20px;
  padding: 10px;
  text-align: right;
  font-size: 2rem;
  color: white;
  overflow-x: auto;
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
}

button {
  padding: 20px;
  font-size: 1.2rem;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  background: #444;
  color: white;
}

button:hover {
  background: #555;
  transform: scale(1.05);
}

.operator {
  background: #ff9f43;
}

.operator:hover {
  background: #ff7b00;
}

.equal {
  background: #2ecc71;
  grid-column: span 2;
}

.equal:hover {
  background: #27ae60;
}

.clear {
  background: #e74c3c;
}

.clear:hover {
  background: #c0392b;
}

.del {
  background: #9b59b6;
}

.del:hover {
  background: #8e44ad;
}

@media (max-width: 500px) 
{
  .display 
  {
    font-size: 1.5rem;
    height: 60px;
  }
  .button 
  {
    font-size: 1rem;
    padding: 15px;
  }
  
}