body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.title {
    color: #545353; /* 浅灰色 */
    text-align: center;
    padding-bottom: 10px;
    position: relative;
}
.title::after {
    content: '';
    display: block;
    width: 80%;
    height: 1px;
    background-color: #D3D3D3; /* 浅灰色 */
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.container {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 400px;
    text-align: center;
}

h1 {
    margin-bottom: 20px;
    color: #333;
}

.input-group {
    margin-bottom: 15px;
}

button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

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

input[type="text"] {
    width: calc(100% - 22px);
    padding: 10px;
    margin-top: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
}

#fileListContainer {
    margin-top: 20px;
    text-align: left;
}

#fileListContainer ul {
    list-style-type: none;
    padding: 0;
}

#fileListContainer li {
    background-color: #f9f9f9;
    margin-bottom: 5px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.message {
    background-color: #ffdddd;
    color: #d8000c;
    border: 1px solid #d8000c;
    padding: 10px;
    border-radius: 4px;
    margin-top: 20px;
    text-align: center;
}