body {
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    font-family: 'Roboto', sans-serif;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100vh;
}

.login-card {
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.login-card .card-header {
    font-size: 1.8rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: #333;
}

.form-control {
    border-radius: 8px;
    padding: 0.75rem 1rem;
    border: 1px solid #ddd;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: #2a5298;
    box-shadow: 0 0 0 0.2rem rgba(42, 82, 152, 0.25);
}

.btn-login {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    font-weight: 500;
    background: #2a5298;
    border: none;
    border-radius: 8px;
    color: white;
    transition: all 0.3s ease;
}

.btn-login:hover {
    background: #1e3c72;
    transform: translateY(-1px);
}

.alert {
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.invalid-feedback {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.input-group-text {
    background-color: #f8f9fa;
    border: 1px solid #ddd;
    color: #6c757d;
}

/* Animation */
.login-card {
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}