.container {
  max-width: 600px;
  margin: 50px auto;
  padding: 20px;
  text-align: center;
  background: #fffdf5;
  border: 2px solid #e3c48f;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h1 { font-size: 2em; margin-bottom: 20px; }
#card-display {
  margin: 20px 0;
  padding: 20px;
  border: 1px dashed #aaa;
  border-radius: 5px;
  background: #fafafa;
}
.hidden { display: none; }
button {
  padding: 10px 30px;
  font-size: 1.2em;
  background: #e3c48f;
  color: #333;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}
button:hover { background: #d4b679; }