body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  margin: 0;
  padding: 40px 20px;
}

.container {
  max-width: 500px;
  margin: auto;
  padding: 30px;
  background: white;
  border-radius: 15px;
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.1);
  text-align: center;
}

h1 {
  margin-top: 0;
}

input {
  margin: 20px 0;
}

#preview {
  display: none;
  max-width: 100%;
  max-height: 350px;
  margin: 20px auto;
  border-radius: 10px;
}

button {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 8px;
  background: #111;
  color: white;
  font-size: 16px;
  cursor: pointer;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#status {
  margin-top: 20px;
  line-height: 1.6;
}