/* PWA install button — chat top bar (matches Skipper azure accent) */
body.chat-page .pwa-install-btn {
    appearance: none;
    -webkit-appearance: none;
    margin: 0;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    font-family: var(--font-main, "Inter", system-ui, sans-serif);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #38bdf8;
    border: 1px solid rgba(56, 189, 248, 0.45);
    background: linear-gradient(
        135deg,
        rgba(56, 189, 248, 0.12) 0%,
        rgba(15, 23, 42, 0.94) 55%
    );
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 0.5rem 0.85rem;
    border-radius: 6px;
    line-height: 1.2;
    box-shadow:
        0 0 14px rgba(56, 189, 248, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.06);
    transition:
        color 0.2s,
        border-color 0.2s,
        background 0.2s,
        box-shadow 0.2s,
        transform 0.15s;
}

body.chat-page .pwa-install-btn::before {
    content: "";
    flex-shrink: 0;
    width: 0.85rem;
    height: 0.85rem;
    background: currentColor;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3v12'/%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3Cpath d='M5 21h14'/%3E%3C/svg%3E") center / contain no-repeat;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3v12'/%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3Cpath d='M5 21h14'/%3E%3C/svg%3E") center / contain no-repeat;
    opacity: 0.95;
}

body.chat-page .pwa-install-btn:hover {
    color: #7dd3fc;
    border-color: #38bdf8;
    background: linear-gradient(
        135deg,
        rgba(56, 189, 248, 0.28) 0%,
        rgba(30, 41, 59, 0.96) 60%
    );
    box-shadow:
        0 0 22px rgba(56, 189, 248, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

body.chat-page .pwa-install-btn:active {
    transform: translateY(0);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.25);
}

body.chat-page .pwa-install-btn[hidden] {
    display: none !important;
}

body.chat-page .chat-topbar {
    gap: 0.5rem;
}

@media (max-width: 480px) {
    body.chat-page .pwa-install-btn {
        font-size: 0.62rem;
        padding: 0.42rem 0.6rem;
        gap: 0.3rem;
    }

    body.chat-page .pwa-install-btn::before {
        width: 0.75rem;
        height: 0.75rem;
    }
}