.app-update-notice {
    position: fixed;
    top: calc(env(safe-area-inset-top, 0px) + 12px);
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    width: min(560px, calc(100% - 24px));
    box-sizing: border-box;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border: 1px solid #6bb8f0;
    border-radius: 12px;
    background: #102b43;
    color: #fff;
    box-shadow: 0 4px 20px #0004;
    font: 14px/1.4 system-ui, sans-serif;
}
.app-update-notice button {
    flex: 0 0 auto;
    min-height: 44px;
    padding: 8px 12px;
    border: 0;
    border-radius: 8px;
    background: #d5eeff;
    color: #102b43;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}
.app-update-notice button:focus-visible { outline: 3px solid #fff; outline-offset: 3px; }
@media (max-width: 420px) {
    .app-update-notice { flex-direction: column; align-items: stretch; }
}