.pwa-update-banner {
    position: fixed;
    z-index: 1200;
    top: calc(env(safe-area-inset-top, 0px) + 14px);
    left: 50%;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 18px;
    width: min(540px, calc(100vw - 28px));
    padding: 14px 16px;
    color: #20352b;
    background: linear-gradient(120deg, #eff8f2 0%, #fff 76%);
    border: 1.5px solid #8fc6a8;
    border-radius: 14px;
    box-shadow: 0 14px 34px rgba(28, 83, 57, 0.2), 0 3px 10px rgba(28, 83, 57, 0.1);
    transform: translateX(-50%);
    animation: pwa-update-enter 260ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.pwa-update-banner[hidden],
.pwa-update-banner [hidden] {
    display: none;
}

.pwa-update-message {
    min-width: 0;
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.45;
}

.pwa-update-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.pwa-update-button {
    min-height: 44px;
    padding: 9px 16px;
    border: 1px solid transparent;
    border-radius: 12px;
    font: inherit;
    font-size: 14px;
    font-weight: 700;
    white-space: nowrap;
    cursor: pointer;
    transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.pwa-update-button:hover:not(:disabled) {
    transform: translateY(-1px);
}

.pwa-update-button:focus-visible {
    outline: 3px solid #216b4b;
    outline-offset: 3px;
}

.pwa-update-button:disabled {
    cursor: progress;
    opacity: 0.72;
}

.pwa-update-button-primary {
    color: #fff;
    background: linear-gradient(135deg, #39765d 0%, #28654c 100%);
    box-shadow: 0 4px 12px rgba(40, 101, 76, 0.2);
}

.pwa-update-button-primary:hover:not(:disabled) {
    box-shadow: 0 7px 16px rgba(40, 101, 76, 0.27);
}

.pwa-update-button-secondary {
    color: #365346;
    background: rgba(229, 239, 233, 0.88);
    border-color: #d7e5dc;
}

[data-theme="dark"] .pwa-update-banner {
    color: #e3f2e9;
    background: linear-gradient(120deg, rgba(26, 55, 42, 0.98), rgba(34, 39, 36, 0.98));
    border-color: #5c9a77;
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.5), 0 0 18px rgba(65, 153, 105, 0.18);
}

[data-theme="dark"] .pwa-update-button-primary {
    color: #10271a;
    background: linear-gradient(135deg, #a5d9b8 0%, #78bf95 100%);
}

[data-theme="dark"] .pwa-update-button-secondary {
    color: #dcefe3;
    background: rgba(75, 94, 82, 0.8);
    border-color: #597363;
}

@keyframes pwa-update-enter {
    from { opacity: 0; transform: translate(-50%, -8px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

@media (max-width: 520px) {
    .pwa-update-banner {
        grid-template-columns: minmax(0, 1fr);
        gap: 10px;
        padding: 13px;
    }

    .pwa-update-actions {
        justify-content: flex-end;
    }
}

@media (prefers-reduced-motion: reduce) {
    .pwa-update-banner {
        animation: none;
    }

    .pwa-update-button {
        transition: none;
    }
}