body {
        display: flex;
        flex-direction: column;
        min-height: 100vh;
        background: #f5f7fb;
    }
    .login-container {
        max-width: 450px;
        width: 100%;
        padding: 2rem;
        margin: auto;
    }
    .card-title {
        font-size: 1.5rem;
        margin-bottom: 0.5rem;
    }
    .step {
        display: none;
    }
    .step.active {
        display: block;
    }