body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(to bottom right, #e0f7fa, #ffffff);
  color: #333;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.container {
  text-align: center;
  padding: 2rem;
  max-width: 600px;
  width: 100%;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 0.3rem;
}

.subtitle {
  font-size: 1rem;
  color: #666;
  margin-bottom: 1.5rem;
}

select, button {
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  margin: 0.5rem;
  border: none;
  border-radius: 6px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

button {
  background-color: #0070f3;
  color: white;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background-color: #0059c1;
}

.output {
  font-size: 1.5rem;
  margin: 1rem 0;
  color: #0070f3;
}

footer {
  margin-top: auto;
  padding: 1rem;
  text-align: center;
  font-size: 0.85rem;
  background: #f0f0f0;
  width: 100%;
}