body {
    font-family: Arial, sans-serif;
    max-width: 500px;
    margin: 50px auto;
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}

input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    box-sizing: border-box;
}

input[type="text"]:focus {
    outline: none;
    border-color: #007bff;
}

input[type="text"].error {
    border-color: #dc3545;
}

button {
    width: 100%;
    padding: 12px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

button:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
}

.message {
    margin-top: 20px;
    padding: 10px;
    border-radius: 5px;
    font-weight: bold;
}

.error-message {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.success-message {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.user-data {
    background-color: #e9ecef;
    padding: 15px;
    border-radius: 5px;
    margin-top: 10px;
}

.user-data h3 {
    margin-top: 0;
    color: #495057;
    margin-bottom: 15px;
}

.user-details-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.user-details-list li {
    background: white;
    margin: 8px 0;
    padding: 10px 15px;
    border-radius: 5px;
    border-left: 4px solid #007bff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.user-details-list li strong {
    color: #495057;
    font-weight: 600;
}

.user-details-list li span {
    color: #6c757d;
    margin-left: 8px;
}