.app-shell-public {
            display: block;
            background: linear-gradient(180deg, var(--bs-tertiary-bg), var(--bs-body-bg) 28rem);
        }
        .app-shell-public .app-main { width: 100%; padding: clamp(.85rem, 3vw, 1.5rem); }
        .app-shell-public .main-content { max-width: 1080px; }
        .app-shell-public .main-content > .mb-3:first-child { border-radius: 1rem !important; }
        .app-skip-link {
            position: fixed;
            top: max(.75rem, env(safe-area-inset-top));
            left: max(.75rem, env(safe-area-inset-left));
            z-index: 2100;
            padding: .7rem 1rem;
            border-radius: .75rem;
            color: var(--bs-white);
            background: var(--bs-primary);
            box-shadow: 0 .75rem 1.75rem rgba(0, 0, 0, .22);
            text-decoration: none;
            transform: translateY(calc(-100% - 2rem));
            transition: transform .18s ease;
        }
        .app-skip-link:focus {
            color: var(--bs-white);
            transform: translateY(0);
        }
        #main-content:focus { outline: none; }
        #main-content:focus-visible {
            outline: .2rem solid color-mix(in srgb, var(--bs-primary) 35%, transparent);
            outline-offset: .25rem;
        }
        :target { scroll-margin-top: 5.5rem; }
        .app-back-to-top {
            position: fixed;
            right: max(1rem, env(safe-area-inset-right));
            bottom: var(--app-back-to-top-bottom, max(1rem, env(safe-area-inset-bottom)));
            z-index: 1040;
            display: inline-grid;
            place-items: center;
            width: 3rem;
            height: 3rem;
            min-height: 3rem;
            padding: 0;
            border-radius: 50%;
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transform: translateY(.75rem) scale(.92);
            transition: opacity .18s ease, transform .18s ease, visibility .18s ease;
            box-shadow: 0 .7rem 1.6rem rgba(0, 0, 0, .2);
        }
        .app-back-to-top.is-visible {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
            transform: translateY(0) scale(1);
        }
        .app-back-to-top:focus-visible {
            outline: .2rem solid color-mix(in srgb, var(--bs-primary) 35%, transparent);
            outline-offset: .2rem;
        }
        body.modal-open .app-back-to-top {
            opacity: 0 !important;
            visibility: hidden !important;
            pointer-events: none !important;
        }
        @media (max-width: 575.98px) {
            .app-back-to-top {
                right: max(.75rem, env(safe-area-inset-right));
                width: 2.75rem;
                height: 2.75rem;
                min-height: 2.75rem;
            }
        }
        @media (prefers-reduced-motion: reduce) {
            html { scroll-behavior: auto !important; }
            .app-skip-link,
            .app-back-to-top { transition: none; }
        }