body { 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    height: 100vh; 
    background-color: #1e1e2f; 
    margin: 0; 
    color: #333; 
}
.login-box { 
    background: #ffffff; 
    padding: 2.5rem; 
    border-radius: 8px; 
    box-shadow: 0 10px 25px rgba(0,0,0,0.5); 
    width: 100%; 
    max-width: 350px; 
}
h2 { 
    margin-top: 0; 
    color: #1e1e2f; 
    text-align: center; 
    margin-bottom: 1.5rem; 
}
input { 
    width: 100%; 
    padding: 12px; 
    margin: 8px 0 20px 0; 
    border: 1px solid #ccc; 
    border-radius: 4px; 
    box-sizing: border-box; 
}
button { 
    width: 100%; 
    padding: 12px; 
    background-color: #4CAF50; 
    color: white; 
    border: none; 
    border-radius: 4px; 
    cursor: pointer; 
    font-size: 16px; 
    font-weight: bold; 
}
button:hover { 
    background-color: #45a049; 
}
.error { 
    color: #d9534f; 
    background: #fdf7f7; 
    padding: 10px; 
    border-left: 4px solid #d9534f; 
    margin-bottom: 15px; 
    font-size: 0.9em; 
}