:root {
    --pwa-bottom-nav-total-height: 56px;
}

/* Default: always hidden */
.pwa-bottom-nav {
    display: none !important;
}

/* Visible only in installed PWA + JS class (belt and suspenders) */
@media all and (display-mode: standalone) {
    body.is-pwa-standalone .pwa-bottom-nav {
        display: flex !important;
    }
}
@media all and (display-mode: fullscreen) {
    body.is-pwa-standalone .pwa-bottom-nav {
        display: flex !important;
    }
}

.pwa-bottom-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 500000;
    background: var(--aiu-bg-deep, #111111);
    border-top: 1px solid var(--aiu-border-subtle, #333333);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.4);
    justify-content: space-evenly;
    align-items: center;
    height: 56px;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    box-sizing: border-box;
    pointer-events: auto;
    will-change: transform;
    transform: translateZ(0);
}

.pwa-bottom-nav::before {
    content: "";
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: env(safe-area-inset-bottom, 0px);
    background: var(--aiu-bg-deep, #111111);
    z-index: -1;
}

.pwa-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    min-width: 44px;
    min-height: 44px;
    padding: 8px 12px;
    background: none;
    border: none;
    color: var(--aiu-text-secondary, #b0b0b0);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: color 0.15s ease;
    border-radius: 8px;
}

.pwa-nav-btn:hover {
    color: var(--aiu-text-primary, #e0e0e0);
    background: var(--aiu-bg-surface, #2e2e2e);
}

.pwa-nav-btn:active {
    color: var(--aiu-accent, #eeba2c);
    transform: scale(0.92);
}

.pwa-nav-btn.active {
    color: var(--aiu-accent, #eeba2c);
}

.pwa-nav-btn svg {
    flex-shrink: 0;
}

/* Unread badge on messenger button */
.pwa-messenger-badge {
    position: absolute !important;
    top: 2px;
    right: 4px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    border-radius: 8px;
    background: var(--aiu-danger, #ff4444);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    line-height: 16px;
    text-align: center;
}

/* Hide "Download App" button when running as installed PWA */
body.is-pwa-standalone #pwa-install-btn {
    display: none !important;
}
@media all and (display-mode: standalone) {
    #pwa-install-btn {
        display: none !important;
    }
}
@media all and (display-mode: fullscreen) {
    #pwa-install-btn {
        display: none !important;
    }
}
@media all and (display-mode: minimal-ui) {
    #pwa-install-btn {
        display: none !important;
    }
}

/* Body padding so content doesn't hide behind the nav */
body.is-pwa-standalone {
    padding-bottom: var(--pwa-bottom-nav-total-height, 56px) !important;
}