body {
  background: #f5f5f5;
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  background: #fff;
  padding: 20px;
  width: 500px;
  border-radius: 12px;
  box-shadow: 0 0 15px rgba(0,0,0,0.1);
}

textarea {
  width: 100%;
  height: 120px;
  resize: none;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 8px;
  margin-bottom: 15px;
}

button {
  padding: 10px 20px;
  background-color: #0077ff;
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  background-color: #005dd1;
}

#resultBox {
  margin-top: 20px;
  padding: 15px;
  background: #eef;
  border-radius: 8px;
}

.hidden {
  display: none;
}