body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
}

.container {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    text-align: center;
    max-width: 500px;
    width: 90%;
}

.input-area {
    display: flex;
    flex-direction: column;
    margin-bottom: 20px;
}

.input-area textarea,
.input-area input[type="file"] {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box; /* Đảm bảo padding không làm tăng kích thước tổng thể */
    resize: vertical;
}

textarea {
    min-height: 100px;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    margin-bottom: 20px;
}

button:hover {
    background-color: #0056b3;
}

.result-area {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.result-area p {
    margin-right: 10px;
    font-weight: bold;
}

.result-area input {
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
  width: 100%;
  max-width: 350px;
  box-sizing: border-box;
}

.error-message {
  color: red;
  margin-top: 10px;
  display: none; /* Ẩn ban đầu */
}