body {
    background: linear-gradient(135deg, #4e73df, #224abe);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, sans-serif;
}
.login-card {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}
.form-control:focus {
    border-color: #4e73df;
    box-shadow: 0 0 0 0.2rem rgba(78, 115, 223, 0.25);
}
.btn-primary {
    background-color: #4e73df;
    border-color: #4e73df;
}
.btn-primary:hover {
    background-color: #2e59d9;
    border-color: #2653d4;
}
.text-danger {
    font-size: 0.9rem;
}