.install-button {
    position: fixed;
    right: max(16px, env(safe-area-inset-right));
    bottom: calc(92px + env(safe-area-inset-bottom));
    z-index: 900;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 42px;
    padding: 0 15px;
    border: 1px solid color-mix(in srgb, var(--color-accent-primary) 42%, var(--color-border));
    border-radius: 999px;
    background: color-mix(in srgb, var(--color-bg-elevated) 92%, transparent);
    color: var(--color-text-primary);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    font-weight: 650;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 160ms ease, transform 160ms ease, border-color 160ms ease;
}

.install-button.visible {
    opacity: 1;
    transform: translateY(0);
}

.install-button:hover {
    border-color: var(--color-accent-primary);
}

.install-button:disabled {
    opacity: 0.55;
    cursor: wait;
}

.install-button svg {
    width: 17px;
    height: 17px;
}

.install-toast {
    position: fixed;
    top: calc(72px + env(safe-area-inset-top));
    right: max(16px, env(safe-area-inset-right));
    z-index: 10000;
    max-width: min(340px, calc(100vw - 32px));
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
    box-shadow: 0 16px 42px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 160ms ease, transform 160ms ease;
}

.install-toast.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 640px) {
    .install-button {
        bottom: calc(84px + env(safe-area-inset-bottom));
    }

    .install-toast {
        top: auto;
        right: 16px;
        bottom: calc(132px + env(safe-area-inset-bottom));
        left: 16px;
        max-width: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .install-button,
    .install-toast {
        transition: none;
    }
}

@media print {
    .install-button,
    .install-toast {
        display: none !important;
    }
}