.install-prompt {
    position: fixed;
    left: max(16px, env(safe-area-inset-left));
    right: max(16px, env(safe-area-inset-right));
    bottom: max(16px, env(safe-area-inset-bottom));
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    border-radius: 16px;
    background: #fff;
    box-shadow: 0 12px 38px rgba(11, 53, 88, .28);
}
.install-prompt[hidden] { display: none; }
.install-prompt div { display: grid; gap: 3px; flex: 1; }
.install-prompt small { color: #607086; }
.install-link { color: #0b3558; }
@media (max-width: 600px) {
    .install-prompt { align-items: stretch; flex-direction: column; }
}