body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: linear-gradient(135deg, #74ebd5 0%, #9face6 100%);
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      margin: 0;
animation: gradientFlow 10s ease infinite;
background-size: 600% 600%;    }
@keyframes gradientFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
    .container {
      background: #fff;
      padding: 2rem;
      border-radius: 12px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.15);
      max-width: 400px;
      width: 100%;
      text-align: center;
    }
    h2 {
      margin-bottom: 1rem;
      color: #333;
    }
    .switch {
      margin-bottom: 1.5rem;
    }
    select, input {
      width: 100%;
      padding: 0.7rem;
      margin: 0.5rem 0;
      border-radius: 8px;
      border: 1px solid #ccc;
      font-size: 1rem;
    }
    button {
      width: 100%;
      padding: 0.8rem;
      margin-top: 1rem;
background: linear-gradient(135deg, #74ebd5 0%, #9face6 100%);
      color: #000;
      font-size: 1rem;
      font-weight: bold;
      border: none;
      border-radius: 8px;
      cursor: pointer;
background-size: 600% 600%;
animation: gradientFlow 10s ease infinite;    }
    button:hover {
      background: #3759c1;
    }
    .result {
      margin-top: 1.5rem;
      font-size: 1.1rem;
      font-weight: bold;
      color: #222;
    }
    footer {
  position: fixed;
  bottom: 0;             
  left: 0;               
  width: 100%;        
  
  text-align: center;
  padding: 15px;
  background: rgba(0, 0, 0, 0.4); 
  color: white;
  font-family: Arial, sans-serif;
  font-size: 14px;
  letter-spacing: 1px;
  backdrop-filter: blur(6px);
  transition: background 0.5s ease, color 0.5s ease;
}

footer:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fffbf0;
}