body {
    background: #f0f2f5;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.card-rec {
    width: 100%;
    max-width: 420px;
    box-shadow: 0 4px 24px rgba(0,0,0,.10);
    border: none;
    border-radius: 12px;
}
.card-header-rec {
    background: #1a3a5c;
    border-radius: 12px 12px 0 0;
    padding: 2rem;
    text-align: center;
}
.card-header-rec h1 { font-size: 1.25rem; font-weight: 700; color: #fff; margin: 0.5rem 0 0.2rem; }
.card-header-rec p  { color: rgba(255,255,255,.7); font-size: 0.85rem; margin: 0; }
.card-body-rec { padding: 2rem; }
.btn-custom { background: #1a3a5c; border-color: #1a3a5c; }
.btn-custom:hover, .btn-custom:focus { background: #0f2540; border-color: #0f2540; }