body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f9;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.auth-container {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}
.form-group {
    margin-bottom: 1rem;
}
label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}
input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}
button {
    width: 100%;
    padding: 0.75rem;
    background: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}
button:hover { background: #0056b3; }
.message { margin-top: 1rem; padding: 0.5rem; border-radius: 4px; text-align: center; }
.message.error { background: #f8d7da; color: #721c24; }
.message.success { background: #d4edda; color: #155724; }
.hidden { display: none; }