body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f3f4f6;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
  }
  
  .container {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
    width: 300px;
  }
  
  h1 {
    margin-bottom: 1rem;
    color: #333;
  }
  
  input[type="date"] {
    padding: 0.5rem;
    margin: 1rem 0;
    width: 100%;
    border: 1px solid #ccc;
    border-radius: 8px;
  }
  
  button {
    background-color: #4f46e5;
    color: white;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
  }
  
  button:hover {
    background-color: #4338ca;
  }
  
  #result {
    margin-top: 1.5rem;
    font-size: 1.1rem;
    color: #333;
  }