.portal-card {
    width: 100%; max-width: 480px; margin: 8px auto;
    padding: 28px 22px; border: 1px solid var(--color-border);
    border-top: 4px solid var(--color-primary-800);
    border-radius: 16px; background: #fff; box-shadow: var(--shadow-md);
}
.portal-logo { width: 190px; height: auto; margin: 0 auto 24px; }
.portal-product { text-align: center; color: var(--color-primary-950); font-weight: 800; letter-spacing: .1em; }
.portal-product span { display: block; margin-top: 4px; font-size: .75rem; color: var(--color-muted); font-weight: 500; }
.portal-heading { margin: 28px 0 24px; }
.portal-heading h1 { font-size: clamp(1.4rem, 5vw, 1.8rem); line-height: 1.2; color: var(--color-primary-950); margin: 8px 0; }
.portal-heading p { color: var(--color-muted); }
.portal-options { display: grid; gap: 14px; }
.portal-options a { display: grid; gap: 6px; padding: 18px; border: 1px solid var(--color-border); border-radius: 10px; text-decoration: none; background: var(--color-background); }
.portal-options a:hover { border-color: var(--color-primary-600); }
.portal-options strong { display: flex; justify-content: space-between; gap: 8px; color: var(--color-primary-800); }
.portal-options a > span { font-size: .85rem; color: var(--color-muted); }
.portal-form { margin-top: 24px; }
.portal-form .button { width: 100%; min-height: 48px; }
.portal-back { display: flex; min-height: 48px; align-items: center; justify-content: center; margin-top: 12px; }
.portal-footer { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--color-border); color: var(--color-muted); font-size: .8rem; }
.portal-footer p { margin: 8px 0; }
@media (min-width: 600px) { .portal-card { margin: 40px auto; padding: 36px; } }