/* style.css */
:root {
  --bg-color: #ffffff;
  --text-color: #333333;
}

/* A utility class for our dark theme state */
.dark-theme {
  --bg-color: #1e1e1e;
  --text-color: #f5f5f5;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  font-family: sans-serif;
}

.card {
  background-color: var(--bg-color);
  color: var(--text-color);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  text-align: center;
  transition: background-color 0.3s, color 0.3s;
}

.button-group {
  margin: 1.5rem 0;
}

.btn {
  padding: 0.5rem 1.5rem;
  font-size: 1.25rem;
  cursor: pointer;
  margin: 0 0.5rem;
}