body {
    display: flex;
    flex-direction: column;
    background-color: rgba(var(--priUser), 1);
    color: rgba(var(--secUser), 1);
    font-family: Georgia, serif;
    height: 100vh;

    a {
        text-decoration: none;
        font-weight: 700;
        color: rgba(var(--terUser), 1);

        &:hover {
            color: rgba(var(--ninUser), 1);
            text-shadow: 0 0 0.5rem rgba(var(--terUser), 1);
        }
    }

    .container {
        max-width: 960px;
        width: 100%;
        margin: 0 auto;
        // padding: 0 1rem;
        flex: 1;

        .navbar {
            padding: 0.75rem 0;
            border-bottom: 0.1rem solid rgba(var(--secUser), 0.4);

            .navbar-brand {
                margin-left: 1rem;
                h1 {
                    font-size: 2rem;
                }
            }

            
            .container-fluid {
                display: flex;
                align-items: center;
                gap: 1rem;
                margin-right: 0.5rem;

                .navbar-user {
                    flex: 1;
                    min-width: 0;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    gap: 0.25rem;

                    .navbar-text { flex: none; }  // prevent expansion; BYE abuts the spans
                    > form { flex-shrink: 0; order: -1; }  // BYE left of spans
                }

                > #id_cont_game { flex-shrink: 0; }
            }

            .navbar-text,
            .navbar-link {
                flex: 1;
                min-width: 0;
                text-align: center;

                .navbar-label {
                    display: block;
                    color: rgba(var(--secUser), 0.7);
                    font-size: 0.75rem;
                }

                .navbar-identity {
                    display: block;
                    color: rgba(var(--quaUser), 1);
                    font-size: 0.875rem;
                    overflow: hidden;
                    text-overflow: ellipsis;
                    white-space: nowrap;
                }
            }
        }

        .input-group {
            position: fixed;
            left: 0;
            right: 0;
            top: 50%;
            transform: translateY(-50%);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
            z-index: 50;

            .form-control {
                width: 24rem;
                text-align: center;
            }
        }

        .form-control {
            background-color: rgba(var(--priUser), 1);
            color: rgba(var(--secUser), 1);
            border: 0.1rem solid rgba(var(--secUser), 0.5);
            --_pad-v: 0.5rem;
            padding: var(--_pad-v) 0.75rem;
            border-radius: calc((var(--_pad-v) * 2 + 1em) / 3);
            width: 100%;
            font-family: inherit;

            &.is-invalid {
                border-color: rgba(var(--priRd), 1);
            }

            &.form-control-lg {
                --_pad-v: 0.75rem;
                padding: var(--_pad-v) 1rem;
                font-size: 1.125rem;
            }

            &.is-invalid ~ .invalid-feedback {
                display: block;
            }

            &:focus {
                border-color: rgba(var(--terUser), 0.75);
                box-shadow: 0 0 0.75rem rgba(var(--terUser), 0.5);
            }
        }

        .invalid-feedback {
            display: none;
            color: rgba(var(--priRd), 1);
            font-size: 0.875rem;
            margin-top: 0.25rem;
        }

        .alert {
            padding: 0.75rem 1rem;
            margin: 0.75rem;
            border-radius: 0.5rem;
            border: 0.1rem solid rgba(var(--priYl), 0.5);
            color: rgba(var(--priYl), 1);

            &.alert-success {
                border-color: rgba(var(--priGn), 0.5);
                color: rgba(var(--priGn), 1);
            }

            &.alert-warning {
                border-color: rgba(var(--priOr), 0.5);
                color: rgba(var(--priOr), 1);
            }
        }

        .row {
            padding: 2rem 0;

            .col-md-12 {
                width: 100%;
                justify-content: center;
            }

            .col-lg-6 {
                max-width: inherit;
                margin: 0 1rem;
                
                h2 {
                    font-size: 3rem;
                    color: rgba(var(--secUser), 0.75);
                    margin-bottom: 1rem;
                    text-align: justify;
                    text-align-last: justify;
                    text-justify: inter-character;
                    text-transform: uppercase;
                    text-shadow:
                        // 1px 1px 0 rgba(255, 255, 255, 0.125),       // highlight (up-left)
                        var(--title-shadow-offset) var(--title-shadow-offset) 0 rgba(0, 0, 0, 0.8)    // shadow (down-right)
                    ;

                    span {
                        color: rgba(var(--quaUser), 0.75);
                    }
                }
            }
        }
    }
}

@media (min-width: 1200px) {
    body .container {
        max-width: 1200px;
    }
}

@media (orientation: landscape) {
    $sidebar-w: 5rem;

    // ── Sidebar layout: navbar ← left, footer → right ────────────────────────────
    body {
        flex-direction: row;
    }

    // Navbar → fixed left sidebar
    body .container .navbar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        width: $sidebar-w;
        padding: 0.5rem 0;
        border-bottom: none;
        border-right: 0.1rem solid rgba(var(--secUser), 0.4);
        background-color: rgba(var(--priUser), 1);
        z-index: 100;
        overflow: hidden;

        .container-fluid {
            flex-direction: column;
            height: 100%;
            max-height: 700px;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 0 0.25rem;
            margin: 0;  // reset portrait margin-right: 0.5rem so container fills full sidebar width

            > #id_cont_game { flex-shrink: 0; order: -1; }  // cont-game above brand

            .navbar-user {
                flex-direction: column;
                align-items: center;
                gap: 0.25rem;
                .navbar-text { margin: 0; }  // cancel landscape margin:auto so BYE abuts
                > form { order: 0; .btn { margin-top: 0; } }  // abut spans
            }
        }

        .navbar-brand h1 {
            writing-mode: vertical-rl;
            transform: rotate(180deg);
            font-size: 1.2rem;
            line-height: 1.2;
            white-space: nowrap;
            // margin-right: 3.25rem;
        }

        .navbar-brand {
            order: 1;  // brand at bottom
            width: 100%;
            margin-left: 0;  // reset portrait margin-left: 1rem
            display: flex;
            justify-content: center;
        }

        .navbar-link { display: none; }

        .navbar-text {
            writing-mode: vertical-rl;
            transform: rotate(180deg);
            font-size: 0.65rem;
            white-space: nowrap;
            margin: auto 0;

            .navbar-label { opacity: 0.7; }
        }

        .btn-primary {
            width: 4rem;
            height: 4rem;
            font-size: 0.875rem;
            border-width: 0.21rem;
        }

        // Login form: offset from fixed sidebars in landscape
        .input-group {
            left: $sidebar-w;
            right: $sidebar-w;

            .navbar-text {
                writing-mode: horizontal-tb;
                transform: none;
                font-size: 0.75rem;
                white-space: normal;
                margin: 0 0 0.25rem;
                text-align: center;
            }
        }
    }

    // Container: fill center, compensate for fixed sidebars on both sides.
    // max-width: none overrides the @media (min-width: 1200px) rule above so the
    // container fills all available space between the two sidebars on wide screens.
    body .container {
        flex: 1;
        min-width: 0;
        max-width: none;
        margin-left: $sidebar-w;
        margin-right: $sidebar-w;
        padding: 0 0.5rem;
    }

    // Header row: compact in landscape
    body .container .row {
        padding: 0.25rem 0;

        .col-lg-6 h2 {
            font-size: 1.5rem;
            margin: 0 0 0.25rem;
            letter-spacing: 0.4em;
            text-align: center;
            text-align-last: left;
        }
    }

    // Footer → fixed right sidebar (mirrors navbar approach — explicit right boundary)
    // Use body #id_footer (specificity 0,1,0,1) to beat base #id_footer (0,1,0,0)
    // which compiles later in the output and would otherwise override height: 100vh.
    body #id_footer {
        position: fixed;
        right: 0;
        top: 0;
        width: $sidebar-w;
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        border-top: none;
        border-left: 0.1rem solid rgba(var(--secUser), 0.3);
        background-color: rgba(var(--priUser), 1);  // opaque: masks tray sliding behind it
        padding: 1rem 0;
        gap: 0;
        z-index: 100;

        #id_footer_nav {
            flex-direction: column-reverse;
            width: auto;
            max-width: none;
            gap: 3rem;

            a {
                font-size: 1.75rem;
                display: flex;
                justify-content: center;
                align-items: center;
            }
        }

        .footer-container {
            position: absolute;
            top: 0.75rem;
            text-align: center;
            font-size: 1rem;
            line-height: 1.4;
            color: rgba(var(--secUser), 1);

            br { display: block; }
        }
    }
}

// ── XL landscape (≥1800px): double sidebar widths and scale content ────────────
@media (orientation: landscape) and (min-width: 1800px) {
    $sidebar-xl: 8rem;

    body .container .navbar {
        width: $sidebar-xl;

        .container-fluid {
            gap: 2rem;
            padding: 0 0.5rem;
        }

        .navbar-brand h1  { font-size: 2.4rem; }
        .navbar-text      { font-size: 0.78rem; }  // 0.65rem × 1.2
        .btn-primary      { width: 4rem; height: 4rem; font-size: 0.875rem; }

        .input-group {
            left:  $sidebar-xl;
            right: $sidebar-xl;
        }
    }

    body .container {
        margin-left:  $sidebar-xl;
        margin-right: $sidebar-xl;
    }

    // h2 page title: portrait-style — centred and full-size on a wide canvas
    body .container .row .col-lg-6 h2 {
        font-size: 4rem;
        letter-spacing: 1em;
        text-align: center;
        text-align-last: center;
    }

    body #id_footer {
        width: $sidebar-xl;

        #id_footer_nav {
            gap: 8rem;
            a { font-size: 3rem; }
        }

        .footer-container { font-size: 0.85rem; }
    }
}

@media (orientation: portrait) and (max-width: 500px) {
    body .container  {
        .navbar {
            padding: 0 0 0.25rem 0;

            .navbar-brand h1 {
                font-size: 1.2rem;
            }
        }

        .row .col-lg-6 h2 {
            text-align: center;
            text-align-last: center;
            letter-spacing: 0.33em;
            margin: 0;
            font-size: 2rem;

            &#id_dash_wallet {
                letter-spacing: 0.25em;
            }
        }
    }
}

#id_footer {
    flex-shrink: 0;
    height: 6rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: center;
    padding: 1rem 1rem;
    border-top: 0.1rem solid rgba(var(--secUser), 0.3);
    // background: linear-gradient(
    //     to top,
    //     rgba(var(--priUser), 1) 25%,
    //     transparent 100%
    // );

    #id_footer_nav {
        display: flex;
        justify-content: space-evenly;
        width: 80%;
        max-width: 500px;

        a {
            font-size: 1.75rem;
            color: rgba(var(--secUser), 0.6);
            text-shadow:
                0 0 0.25rem rgba(0, 0, 0, 0.25),
            ;
            
            &.active {
                color: rgba(var(--quaUser), 1);
                text-shadow:
                    0 0 0.5rem rgba(0, 0, 0, 0.5),
                ;
            }
            
            &:hover {
                color: rgba(var(--quaUser), 1);
                text-shadow:
                    0 0 1rem rgba(0, 0, 0, 0.25),
                    0 0 0.5rem rgba(var(--ninUser), 0.25)
                ;
                
            }
        }
    }

    .footer-container {
        br { display: none; }

        small {
            font-size: 0.75rem;
            opacity: 1;
        }
    }
}

.forthcoming {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    font-style: italic;
    opacity: 0.6;
}

#id_guard_portal {
    display: none;
    position: fixed;
    z-index: 10000;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    background-color: rgba(var(--tooltip-bg), 0.5);
    backdrop-filter: blur(6px);
    border: 0.1rem solid rgba(var(--secUser), 0.4);
    box-shadow: 0 0.25rem 1rem rgba(0, 0, 0, 0.4);

    &.active {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }

    .guard-message {
        font-size: 0.85rem;
        color: rgba(var(--secUser), 0.9);
        text-align: center;
        white-space: nowrap;
    }

    .guard-actions {
        display: flex;
        gap: 0.5rem;
    }
}