body {
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #1d2b64, #f8cdda);
    font-family: 'Segoe UI', sans-serif;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .container {
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  form {
    background-color: #ffffffcc;
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    width: 320px;
  }
  
  .result {
    width: 100%;
    height: 60px;
    font-size: 24px;
    padding: 10px;
    text-align: right;
    border: none;
    border-radius: 10px;
    background: #e0f7fa;
    margin-bottom: 20px;
    box-shadow: inset 2px 2px 5px #aaa;
  }
  
  .buttons-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
  }
  
  input[type="button"] {
    height: 50px;
    font-size: 20px;
    border: none;
    border-radius: 10px;
    background-color: #3f3f3f;
    color: #fff;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
  }
  
  input[type="button"]:hover {
    background-color: #5a5a5a;
    transform: scale(1.05);
  }
  
  input.clear {
    background-color: #ff1744;
  }
  
  input.clear:hover {
    background-color: #ff5252;
  }
  
  input.equals {
    background-color: #00c853;
    grid-column: span 2;
  }
  
  input.equals:hover {
    background-color: #00e676;
  }