/* ... (添加一些美观的 CSS 样式) ... */
body { font-family: sans-serif; background-color: #f4f7f6; margin: 0; padding: 20px; }
.container { max-width: 800px; margin: auto; }
.card { background: white; padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); margin-bottom: 20px; }
h1, h2 { color: #333; }
input[type="text"], input[type="password"] { width: calc(100% - 22px); padding: 10px; margin-bottom: 10px; border: 1px solid #ccc; border-radius: 4px; }
button { width: 100%; padding: 10px; border: none; background-color: #007bff; color: white; border-radius: 4px; cursor: pointer; font-size: 16px; }
button:hover { background-color: #0056b3; }
.status { margin-top: 10px; padding: 10px; border-radius: 4px; }
.status.success { color: #155724; background-color: #d4edda; border: 1px solid #c3e6cb; }
.status.error { color: #721c24; background-color: #f8d7da; border: 1px solid #f5c6cb; }
.checkbox-group { margin-bottom: 15px; }
.checkbox-group label { margin-right: 15px; }
#logout-button { background-color: #dc3545; }
#logout-button:hover { background-color: #c82333; }