body { 
    font-family: sans-serif; 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    height: 100vh; 
    background: #f0f2f5; 
    margin: 0; 
}

.login-card { 
    background: white; 
    padding: 2rem; 
    border-radius: 12px; 
    box-shadow: 0 4px 12px rgba(0,0,0,0.1); 
    width: 320px; 
    text-align: center; 
}

input { 
    width: 100%; 
    padding: 10px; 
    margin: 10px 0; 
    border: 1px solid #ddd; 
    border-radius: 6px; 
    box-sizing: border-box; 
}

button { 
    width: 100%; 
    padding: 10px; 
    background: #007bff; 
    color: white; 
    border: none; 
    border-radius: 6px; 
    cursor: pointer; 
    font-weight: bold; 
}

button:hover { 
    background: #0056b3; 
}

.error { 
    color: red; 
    font-size: 0.9em; 
    margin-bottom: 10px; 
    display: none; 
}