.pwa-install-button {
    position: fixed;
    left: max(14px, env(safe-area-inset-left));
    bottom: max(14px, env(safe-area-inset-bottom));
    z-index: 12000;
    min-height: 42px;
    padding: 0 16px;
    border: 1px solid rgba(7, 85, 143, .2);
    border-radius: 999px;
    background: #07558f;
    color: #fff;
    box-shadow: 0 10px 28px rgba(5, 54, 91, .22);
    font: 750 13px/1 system-ui, sans-serif;
    cursor: pointer;
}
.pwa-install-button:hover { background: #064775; transform: translateY(-1px); }
.pwa-install-button[hidden] { display: none; }
@media (display-mode: standalone) { .pwa-install-button { display: none; } }