:root {
    --pwa-main: var(--main, #208bf6);
    --pwa-ink: #171717;
    --pwa-muted: #626262;
    --pwa-panel: #ffffff;
    --pwa-border: rgba(23, 23, 23, 0.14);
    --pwa-shadow: 0 14px 34px rgba(0, 0, 0, 0.18);
}

#pwa-popup,
#pwa-network-status {
    box-sizing: border-box;
    font-family: Arial, sans-serif;
    letter-spacing: 0;
}

#pwa-popup[hidden],
#install-button[hidden] {
    display: none !important;
}

#pwa-popup {
    position: fixed;
    top: 18px;
    left: 50%;
    z-index: 10000;
    display: flex;
    width: min(340px, calc(100vw - 32px));
    transform: translateX(-50%);
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 16px;
    border: 1px solid var(--pwa-border);
    border-radius: 8px;
    background-color: var(--pwa-panel);
    box-shadow: var(--pwa-shadow);
    color: var(--pwa-ink);
    text-align: center;
}

#pwa-popup img {
    width: 200px;
    height: auto;
    border-radius: 8px;
    object-fit: cover;
}

#pwa-popup strong {
    display: block;
    color: var(--pwa-ink);
    font-size: 16px;
    line-height: 1.25;
}

#pwa-popup span {
    display: block;
    color: var(--pwa-muted);
    font-size: 14px;
    line-height: 1.45;
}

#pwa-popup .pwa-buttons {
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: center;
}

#pwa-popup button,
#install-button {
    min-height: 38px;
    border: 1px solid transparent;
    border-radius: 8px;
    background: var(--pwa-main);
    color: #ffffff;
    cursor: pointer;
    font-size: 14px;
    font-weight: 700;
    line-height: 1;
}

#pwa-popup button {
    padding: 0 14px;
}

#pwa-popup button:hover,
#install-button:hover {
    filter: brightness(0.96);
}

#pwa-popup button:focus-visible,
#install-button:focus-visible {
    outline: 3px solid rgba(253, 127, 32, 0.35);
    outline-offset: 2px;
}

#pwa-popup button.is-secondary {
    border-color: var(--pwa-border);
    background: #f6f6f6;
    color: var(--pwa-ink);
}

#install-button {
    position: fixed;
    right: 18px;
    bottom: calc(18px + env(safe-area-inset-bottom, 0px));
    z-index: 9999;
    padding: 0 16px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

#pwa-network-status {
    position: fixed;
    right: 18px;
    left: 18px;
    bottom: calc(18px + env(safe-area-inset-bottom, 0px));
    z-index: 10001;
    display: none;
    max-width: 520px;
    margin: 0 auto;
    padding: 10px 14px;
    border-radius: 8px;
    box-shadow: var(--pwa-shadow);
    color: #ffffff;
    font-size: 14px;
    line-height: 1.35;
    text-align: center;
}

#pwa-network-status.is-visible {
    display: block;
}

#pwa-network-status.is-offline {
    background: #242424;
}

#pwa-network-status.is-online {
    background: #1f7a45;
}

@media (max-width: 480px) {
    #pwa-popup {
        top: 12px;
    }

    #pwa-popup .pwa-buttons {
        align-items: stretch;
    }

    #install-button {
        right: 12px;
        bottom: calc(12px + env(safe-area-inset-bottom, 0px));
    }
}