* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}
body 
{
  background: linear-gradient(to right, #00c6ff, #0072ff);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}
.container 
{
  background-color: white;
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  text-align: center;
  width: 100%;
  max-width: 400px;
}
h1 
{
  margin-bottom: 15px;
  color: #0072ff;
}
#date-time 
{
  font-size: 14px;
  color: #555;
  margin-bottom: 20px;
}
label 
{
  display: block;
  margin-bottom: 10px;
  font-weight: bold;
  color: #333;
}
input[type="date"] 
{
  padding: 10px;
  width: 100%;
  font-size: 16px;
  border: 1px solid #ccc;
  border-radius: 8px;
  margin-bottom: 20px;
}
button 
{
  padding: 12px 20px;
  font-size: 16px;
  background-color: #0072ff;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
}
button:hover 
{
  background-color: #005fcc;
}
#result 
{
  margin-top: 20px;
  font-size: 18px;
  color: #222;
}
@media (max-width: 480px) 
{
  h1 
  {
    font-size: 22px;
  }
  #result 
  {
    font-size: 16px;
  }
  button 
  {
    width: 100%;
  }
}