body {
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf9 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.login-card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    overflow: hidden;
}

.login-header {
    background: #435ebe;
    padding: 30px 20px;
    text-align: center;
}

.logo {
    max-width: 180px;
    height: auto;
    margin: 0 auto 15px;
}

.logo-placeholder {
    font-size: 1.8rem;
    font-weight: 700;
    color: #435ebe;
    margin: 0 auto 15px;
    display: none;
}

.login-body {
    background: #ffffff;
    padding: 30px;
}

.form-control:focus {
    border-color: #435ebe;
    box-shadow: 0 0 0 0.25rem rgba(67, 94, 190, 0.25);
}

.btn-primary {
    background-color: #435ebe;
    border-color: #435ebe;
    padding: 10px;
    font-weight: 600;
    width: 100%;
}

.btn-primary:hover {
    background-color: #384ea0;
    border-color: #384ea0;
}

.alert {
    border-radius: 8px;
}

/* Responsive */
@media (max-width: 576px) {
    .login-header, .login-body {
        padding: 20px;
    }
}