body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    max-width: 400px;
    margin: 100px auto;
    padding: 20px;
    background: #f5f5f5;
}

.card {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

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

button {
    background: #007bff;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    margin: 10px;
    min-width: 140px;
}

button:hover {
    background: #0056b3;
}

button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.message {
    margin: 20px 0;
    padding: 10px;
    border-radius: 4px;
}

.error { 
    background: #ffe6e6; 
    color: #d8000c; 
}

.success { 
    background: #e6ffe6; 
    color: #4f8a10; 
}