@layer no-stylesheet, variables, base, theme, question, user_custom, force;

@layer variables {
    .numbas-container, .force-default-style {
        --base-text-size: 18px;

        --text-size: 1;

        --scaled-text-size: calc(var(--text-size) * var(--base-text-size));

        font-size: var(--scaled-text-size);

        --line-height: 1.5;

        --border-width: thin;

        --main-font: sans-serif;

        --readable-width: 80ch;

        --content-max-width: calc(1.3 * var(--readable-width));

        --spacing-scale: 1;
        --spacing: calc(1 * var(--base-text-size) * var(--spacing-scale));
        --half-space: calc(0.5 * var(--spacing));
        --third-space: calc(1 / 3 * var(--spacing));
        --two-thirds-space: calc(2 / 3 * var(--spacing));
        --double-space: calc(2 * var(--spacing));
        --quad-space: calc(4 * var(--spacing));

        --font-weight: 400;
        --font-weight-bold: calc(700 / 400 * var(--font-weight));

        --main-font: sans-serif;

        --text-pad: calc(0.1 * var(--spacing));
        --double-text-pad: calc(2 * var(--text-pad));
        --quad-text-pad: calc(4 * var(--text-pad));

        --transition-duration: 0.5s;
        --half-transition: calc(0.5 * var(--transition-duration));
        --double-transition: calc(2 * var(--transition-duration));
        --quad-transition: calc(4 * var(--transition-duration));

        --button-radius: 0.2em;

        --exam-height: 100svh;
    }

    @media (prefers-reduced-motion: reduce) {
        --transition-duration: 0s;
    }
}

@keyframes lightbox-fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@layer force {
    body > #no-stylesheet {
        display: none;
    }
    body > #with-stylesheet {
        display: revert;
    }

    [hidden] {
        display: none;
    }

    .visibility-hidden {
        visibility: hidden;
    }

    @media screen {
        .print-only {
            display: none;
        }
    }

    mjx-container svg {
        background: none;
        color: inherit;
        filter: none;
    }
}

@layer base {
    :root {
        color-scheme: light dark;
    }

    *:not(mjx-container *, svg *) {
        box-sizing: border-box;
    }
    svg * {
        font-size-adjust: none;
    }

    .sr-only {
        position: absolute;
        width: 1px;
        height: 1px;
        margin: -1px;
        padding: 0;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        border: 0;
    }


    body, exam-container, .img-thumbnail, .table .table {
        background-color: var(--background-color);
        color: var(--text-color);
    }
    code, kbd, pre, samp {
        font-family: monospace;
        font-size: 1em;
    }
    table {
        width: auto;
        margin-left: auto;
        margin-right: auto;
        margin-bottom: var(--spacing);
        border-collapse: collapse;
        border-spacing: 0;
        font-variant: tabular-nums;
    }
    svg text {
        fill: currentColor;
    }

    /*! Source: https://github.com/h5bp/html5-boilerplate/blob/master/src/css/main.css */
    @media print {
        *,
        *:before,
        *:after {
            background: transparent !important;
            color: var(--text-color) !important;
            box-shadow: none !important;
            text-shadow: none !important;
        }

        html {
            overflow: revert;
        }

        a, a:visited {
            text-decoration: underline;
        }
        a[href]:after {
            content: " (" attr(href) ")";
        }
        abbr[title]:after {
            content: " (" attr(title) ")";
        }
        a[href^="#"]:after,
        a[href^="javascript:"]:after {
            content: "";
        }
        pre,
        tr,
        img,
        blockquote {
            page-break-inside: avoid;
        }

        table {
            page-break-inside: avoid;
        }

        thead {
            display: table-header-group;
        }
        img {
            max-width: 100% !important;
        }
        p,
        h2,
        h3 {
            orphans: 3;
            widows: 3;
        }
        h2,
        h3 {
            page-break-after: avoid;
        }
    }

    *::before,
    *::after {
        box-sizing: border-box;
    }

    @media screen {
        html {
            overflow: hidden;
        }

        p, pre, li {
            max-width: var(--readable-width);
        }

        .invisible {
            position: absolute !important;
            left: -2000000px;
            top: -2000000px;
            max-height: 100vh;
            overflow-y: scroll;
            visibility: hidden;
        }
    }

    @media print {
        ::-webkit-scrollbar {
            display: none;
        }
        .invisible:not(.print-visible) {
            position: absolute !important;
            left: -2000000px;
            top: -2000000px;
            max-height: 100vh;
            overflow-y: scroll;
        }
        .invisible.print-visible {
            visibility: visible;
        }
    }

    body, .numbas-container {
        margin: 0;
        font-family: var(--main-font);
        line-height: var(--line-height);
        color: var(--text-color);
        background-color: var(--background-color);
    }

    input,
    button,
    select,
    textarea {
        font-family: inherit;
        font-size: inherit;
        line-height: inherit;
    }

    input, select {
        line-height: 1;
        padding: var(--third-space);
    }

    figure {
        margin: 0;
    }

    img {
        vertical-align: middle;
    }

    hr {
        box-sizing: content-box;
        height: 0;
        margin-top: var(--double-space);
        margin-bottom: var(--double-space);
        border: 0;
    }

    [role="button"] {
        cursor: pointer;
    }

    h1,
    h2,
    h3,
    h4,
    h5,
    h6 {
        font-family: inherit;
        font-weight: calc(500/400 * var(--font-weight));
        line-height: 1.1;
        color: inherit;
    }

    h1,
    h2,
    h3 {
        margin-top: var(--double-space);
        margin-bottom: var(--spacing);
    }

    h4,
    h5,
    h6 {
        margin-top: var(--spacing);
        margin-bottom: var(--spacing);
    }

    h1 {
        font-size: calc(3 * var(--base-text-size));
    }

    h2 {
        font-size: calc(2 * var(--base-text-size));
    }

    h3 {
        font-size: calc(1.7 * var(--base-text-size));
    }

    h4 {
        font-size: calc(1.4 * var(--base-text-size));
    }

    h5 {
        font-size: calc(1 * var(--base-text-size));
    }

    h6 {
        font-size: calc(0.9 * var(--base-text-size));
    }

    p {
        margin: 0 0 var(--spacing) 0;
    }

    .text-center {
        text-align: center;
    }

    menu,
    ul,
    ol {
        margin-top: 0;
        margin-bottom: var(--spacing);
    }

    .break-words {
        word-break: break-word;
        hyphens: auto;
    }


    .table-responsive {
        overflow-y: hidden;
    }

    :is(ol,ul,menu) :is(ol,ul,menu) {
        margin-bottom: 0;
    }
    .list-unstyled {
        padding-left: 0;
        list-style: none;
    }
    .list-inline {
        padding-left: 0;
        list-style: none;
        margin-left: -var(--third-space);
    }
    .list-inline > li {
        display: inline-block;
        padding-left: var(--third-space);
        padding-right: var(--third-space);
    }
    blockquote {
        padding: var(--spacing) var(--double-space);
        margin: 0 0 var(--double-space);
        font-size: calc(1.25 * var(--base-text-size));
        border-left: var(--third-space) solid var(--hr-color);
    }
    blockquote :is(p, ul, ol, menu):last-child {
        margin-bottom: 0;
    }
    blockquote footer,
    blockquote small {
        display: block;
        font-size: 80%;
        line-height: var(--line-height);
        color: var(--muted-color);
    }
    code {
        padding: var(--text-pad) var(--double-text-pad);
        font-size: 90%;
        border-radius: var(--button-radius);
    }
    kbd {
        padding: var(--text-pad) var(--quad-text-pad);
        font-size: 90%;
        border-radius: var(--button-radius);
        box-shadow: inset 0 -1px 0 var(--faint-bg-color);
    }
    kbd kbd {
        padding: 0;
        font-size: 100%;
        font-weight: var(--font-weight-bold);
        box-shadow: none;
    }
    pre {
        overflow: auto;
        display: block;
        padding: var(--spacing);
        margin: 0 0 var(--spacing);
        font-size: calc(1 * var(--base-text-size));
        line-height: var(--line-height);
        word-break: break-all;
        word-wrap: break-word;
        border-radius: var(--button-radius);
    }
    pre code {
        padding: 0;
        font-size: inherit;
        color: inherit;
        white-space: pre-wrap;
        background-color: transparent;
        border-radius: 0;
    }

    table {
        background-color: transparent;
    }
    caption {
        padding-top: var(--half-space);
        padding-bottom: var(--half-space);
        color: var(--muted-color);
        text-align: start;
    }
    th {
        text-align: start;
    }
    .table {
        width: 100%;
        max-width: 100%;
        margin-bottom: var(--double-space);
    }
    .table > :is(thead, tbody, tfoot) > tr > :is(th, td) {
        padding: var(--half-space);
        line-height: var(--line-height);
        vertical-align: top;
        border-top: thin solid var(--faint-line-color);
    }
    .table > thead > tr > th {
        vertical-align: bottom;
        border-bottom: medium solid var(--faint-line-color);
    }
    .table > :is(caption + thead, colgroup + thead, thead:first-child) > tr:first-child > :is(th, td) {
        border-top: 0;
    }
    .table > tbody + tbody {
        border-top: medium solid var(--faint-line-color);
    }
    .table .table {
        background-color: var(--background-color);
    }
    .table-responsive {
        overflow-x: auto;
        min-height: 0.01%;
    }
    fieldset {
        padding: 0;
        margin: 0;
        border: 0;
        min-width: 0;
    }
    legend {
        display: block;
        width: 100%;
        padding: 0;
        margin-bottom: var(--double-space);
        line-height: inherit;
        border: 0;
        border-bottom: thin solid var(--faint-line-color);
    }
    label {
        display: inline-block;
        max-width: 100%;
        margin-bottom: var(--third-space);
    }

    input, select, textarea {
        background-color: var(--background-color);
        color: var(--text-color);
    }

    input[type="radio"],
    input[type="checkbox"] {
        margin: var(--double-text-pad) 0 0;
        line-height: normal;
    }
    input[type="file"] {
        display: block;
    }
    input[type="range"] {
        display: block;
        width: 100%;
    }
    select[multiple],
    select[size] {
        height: auto;
    }
    output {
        font-size: calc(var(--text-size) * var(--base-text-size));
    }

    menu, ul, ol {
        padding-left: 0;
        list-style-position: inside;
    }

    iframe {
        border: none;
        max-width: 100%;
    }

    img, object[type*="image"] {
        max-width: 100%;
        height: auto;
    }

    input[type="color"] {
        padding: 0;
        border: none;
    }
    :is(input,select)[disabled] {
        cursor: not-allowed;
        background-color: var(--faint-background);
        color: var(--text-color);
    }

    :is(input[type="radio"], input[type="checkbox"])[disabled],
    fieldset[disabled] :is(input[type="radio"], input[type="checkbox"]) {
        cursor: not-allowed;
    }

    .help-block {
        display: block;
        margin-top: var(--third-space);
        margin-bottom: var(--two-thirds-space);
        font-style: italic;
    }

    .hint {
        font-style: italic;
        font-size: smaller;
        display: inline;
        margin-left: var(--half-space);
    }

    .btn {
        display: inline-block;
        margin-bottom: 0;
        font-weight: var(--font-weight);
        text-align: center;
        vertical-align: middle;
        touch-action: manipulation;
        cursor: pointer;
        background-image: none;
        white-space: nowrap;
        padding: var(--third-space) var(--two-thirds-space);
        font-size: calc(var(--text-size) * var(--base-text-size));
        line-height: var(--line-height);
        border-radius: var(--button-radius);
        user-select: none;
    }
    .btn[disabled],
    fieldset[disabled] .btn {
        cursor: not-allowed;
        pointer-events: none;
    }
    .btn.link {
        text-decoration: underline;
        font-weight: var(--font-weight);
        border-radius: 0;
        box-shadow: none;
    }
    .btn.sm {
        padding: var(--third-space) var(--two-thirds-space);
        font-size: calc(0.9 * var(--base-text-size));
        line-height: var(--line-height);
        border-radius: var(--button-radius);
    }
    .btn.xs {
        padding: var(--text-pad) var(--third-space);
        font-size: calc(0.9 * var(--base-text-size));
        line-height: var(--line-height);
        border-radius: var(--button-radius);
    }
    .navbar-toggle {
        width: calc(1em + 2 * var(--two-thirds-space));
        height: calc(1em + 2 * var(--two-thirds-space));
    }
    .navbar-toggle > svg {
        width: 1em;
        height: 1em;
    }
    .nav {
        margin-bottom: 0;
        padding-left: 0;
        list-style: none;
    }
    .nav > li {
        position: relative;
        display: block;
    }
    .nav > li > a {
        position: relative;
        display: block;
        padding: var(--two-thirds-space) var(--spacing);
    }
    .nav > li > a:is(:hover, :focus) {
        text-decoration: none;
        background-color: var(--highlight-color);
    }
    .nav > li > a > img {
        max-width: none;
    }
    .navbar {
        border-radius: var(--button-radius);
        position: relative;
        min-height: calc(3 * var(--base-text-size));
        margin-bottom: var(--double-space);
        border-bottom: thin solid transparent;

        padding: var(--half-space) var(--spacing);
        margin: var(--double-space) 0;

        gap: var(--spacing);

        & > li > a {
            padding-top: var(--two-thirds-space);
            padding-bottom: var(--two-thirds-space);
            line-height: var(--double-space);
        }

        & p {
            margin: 0;
        }

        & .btn {
            margin-top: var(--third-space);
            margin-bottom: var(--third-space);
            white-space: normal;
        }
    }
    .pager {
        padding-left: 0;
        margin: var(--double-space) 0;
        list-style: none;
        text-align: center;
        display: flex;
        justify-content: space-between;
        --background-color: var(--body-background-color);

        & > li {
            display: inline;

            & > :is(a, span) {
                display: inline-block;
                padding: var(--third-space) var(--two-thirds-space);
                background-color: var(--background-color);
                border: thin solid var(--medium-line-color);
                border-radius: var(--button-radius);
            }

            &.next {
                margin-left: auto;
            }
        }
    }
    .alert {
        padding: var(--spacing);
        margin-bottom: var(--double-space);
        border-radius: var(--button-radius);

        border: thin solid var(--mixed-border-color);
    }
    .alert > :is(p, ul, ol, menu) {
        margin-bottom: 0;
    }
    .alert > p + p {
        margin-top: var(--third-space);
    }
    .well {
        min-height: var(--spacing);
        padding: var(--spacing);
        margin-bottom: var(--spacing);
        background-color: var(--faint-background);
        border: thin solid var(--faint-line-color);
        border-radius: var(--button-radius);
    }

    dialog {
        padding: var(--spacing);
        border-radius: var(--button-radius);
    }

    dialog::backdrop {
        backdrop-filter: contrast(50%);
    }


    dialog > * {
        display: flex;
        flex-direction: column;
        gap: var(--spacing);
    }
    dialog > * > header > h2 {
        min-height: var(--spacing);
        margin: 0;
        font-size: calc(1.5 * var(--base-text-size));
        line-height: var(--line-height);
    }
    dialog > * > footer {
        padding-top: var(--spacing);
        text-align: end;
        border-top: thin solid var(--faint-line-color);
    }
    dialog > * > footer .btn + .btn {
        margin-left: var(--third-space);
        margin-bottom: 0;
    }

    dialog hr {
        margin: 0;
    }

    .center-block {
        display: block;
        margin-left: auto;
        margin-right: auto;
    }

    @container (max-width: 767px) {
        .table-responsive {
            width: 100%;
            margin-bottom: var(--spacing);
            overflow-y: hidden;
        }
        .table-responsive > .table {
            margin-bottom: 0;
        }
        .table-responsive > .table > :is(thead. tbody, tfoot) > tr > :is(th, td) {
            white-space: nowrap;
        }
    }
    @container (min-width: 768px) {
        .navbar {
            & .nav {
                margin: 0;

                & > li > a {
                    padding-top: var(--spacing);
                    padding-bottom: var(--spacing);
                }
            }
        }
    }
    @container (min-width: 992px) {
        .navbar-toggle {
            display: none;
        }
    }
}

@layer variables {
    .numbas-container, #style-modal {
        color-scheme: light dark;
        --feedback-color: transparent;

        --light-highlight: white;
        --light-off: black;
        --light-styled-text-mix: 80%;
        --light-default-style-mix: 10%;
        --light-faint-bg-mix: 10%;
        --light-faint-line-mix: 20%;
        --light-input-bg-mix: 25%;

        --light-background-color: #ffffff;
        --light-text-color: #000000;

        --light-main-color: #a2d1f0;
        --light-main-text-color: black;

        --light-primary-color: #76f2ff;
        --light-primary-text-color: black;

        --light-link-color: #0000ee;
        --light-link-text-color: white;

        --light-success-color: #00da00;
        --light-success-text-color: black;

        --light-info-color: #d3e4ff;
        --light-info-text-color: black;

        --light-warning-color: #996700;
        --light-warning-text-color: white;
        
        --light-danger-color: #df0000;
        --light-danger-text-color: white;

        --light-muted-color: #636363;
        --light-muted-text-color: white;

        --light-highlight-color: #ccffcc;
        --light-highlight-text-color: black;

        --dark-background-color: #000000;
        --dark-background-text-color: white;
        --dark-text-color: #f0f0f0;
        --dark-text-text-color: black;
        --dark-main-color: #1b4764;
        --dark-main-text-color: white;
        --dark-primary-color: #007683;
        --dark-primary-text-color: white;
        --dark-link-color: #a6a6ee;
        --dark-link-text-color: black;
        --dark-success-color: #004f00;
        --dark-success-text-color: white;
        --dark-info-color: #002d7c;
        --dark-info-text-color: white;
        --dark-warning-color: #704b00;
        --dark-warning-text-color: white;
        --dark-danger-color: #bf0003;
        --dark-danger-text-color: white;
        --dark-muted-color: #a4a4a4;
        --dark-muted-text-color: black;
        --dark-highlight-color: #265926;
        --dark-highlight-text-color: black;

        --dark-highlight: black;
        --dark-off: white;
        --dark-styled-text-mix: 40%;
        --dark-default-style-mix: 25%;
        --dark-faint-bg-mix: 15%;
        --dark-faint-line-mix: 40%;
        --dark-input-bg-mix: 60%;

        --highlight: var(--light-highlight);
        --off: var(--light-off);
        --styled-text-mix: var(--light-styled-text-mix);
        --default-style-mix: var(--light-default-style-mix);
        --faint-bg-mix: var(--light-faint-bg-mix);
        --faint-line-mix: var(--light-faint-line-mix);
        --input-bg-mix: var(--light-input-bg-mix);

        --background-color: var(--light-background-color);
        --text-color: var(--light-text-color);

        --main-color: var(--light-main-color);
        --main-text-color: var(--light-main-text-color);

        --primary-color: var(--light-primary-color);
        --primary-text-color: var(--light-primary-text-color);

        --link-color: var(--light-link-color);
        --link-text-color: var(--light-link-text-color);

        --success-color: var(--light-success-color);
        --success-text-color: var(--light-success-text-color);

        --info-color: var(--light-info-color);
        --info-text-color: var(--light-info-text-color);

        --warning-color: var(--light-warning-color);
        --warning-text-color: var(--light-warning-text-color);
        
        --danger-color: var(--light-danger-color);
        --danger-text-color: var(--light-danger-text-color);

        --muted-color: var(--light-muted-color);
        --muted-text-color: var(--light-muted-text-color);

        --highlight-color: var(--light-highlight-color);
        --highlight-text-color: var(--light-highlight-text-color);
    }

    .numbas-container:is([data-prefers-color-scheme="dark"], [data-prefers-color-scheme="custom"].dark-background) {
        --highlight: var(--dark-highlight);
        --off: var(--dark-off);
        --styled-text-mix: var(--dark-styled-text-mix);
        --default-style-mix: var(--dark-default-style-mix);
        --faint-bg-mix: var(--dark-faint-bg-mix);
        --faint-line-mix: var(--dark-faint-line-mix);
        --input-bg-mix: var(--dark-input-bg-mix);
    }

    .numbas-container[data-prefers-color-scheme="dark"] {

        --background-color: var(--dark-background-color);
        --text-color: var(--dark-text-color);

        --main-color: var(--dark-main-color);
        --main-text-color: var(--dark-main-text-color);

        --primary-color: var(--dark-primary-color);
        --primary-text-color: var(--dark-primary-text-color);

        --link-color: var(--dark-link-color);
        --link-text-color: var(--dark-link-text-color);

        --success-color: var(--dark-success-color);
        --success-text-color: var(--dark-success-text-color);

        --info-color: var(--dark-info-color);
        --info-text-color: var(--dark-info-text-color);

        --warning-color: var(--dark-warning-color);
        --warning-text-color: var(--dark-warning-text-color);
        
        --danger-color: var(--dark-danger-color);
        --danger-text-color: var(--dark-danger-text-color);

        --muted-color: var(--dark-muted-color);
        --muted-text-color: var(--dark-muted-text-color);

        --highlight-color: var(--dark-highlight-color);
        --highlight-text-color: var(--dark-highlight-text-color);
    }


    .numbas-container[data-prefers-color-scheme="custom"] {

        --background-color: var(--custom-background-color);
        --text-color: var(--custom-text-color);

        --main-color: var(--custom-main-color);
        --main-text-color: var(--custom-main-text-color);

        --primary-color: var(--custom-primary-color);
        --primary-text-color: var(--custom-primary-text-color);

        --link-color: var(--custom-link-color);
        --link-text-color: var(--custom-link-text-color);

        --success-color: var(--custom-success-color);
        --success-text-color: var(--custom-success-text-color);

        --info-color: var(--custom-info-color);
        --info-text-color: var(--custom-info-text-color);

        --warning-color: var(--custom-warning-color);
        --warning-text-color: var(--custom-warning-text-color);
        
        --danger-color: var(--custom-danger-color);
        --danger-text-color: var(--custom-danger-text-color);

        --muted-color: var(--custom-muted-color);
        --muted-text-color: var(--custom-muted-text-color);

        --highlight-color: var(--custom-highlight-color);
        --highlight-text-color: var(--custom-highlight-text-color);
    }

    @media (prefers-color-scheme: dark) {
        .numbas-container:not([data-prefers-color-scheme]), #style-modal {

            --highlight: var(--dark-highlight);
            --off: var(--dark-off);
            --styled-text-mix: var(--dark-styled-text-mix);
            --default-style-mix: var(--dark-default-style-mix);
            --faint-bg-mix: var(--dark-faint-bg-mix);
            --faint-line-mix: var(--dark-faint-line-mix);
            --input-bg-mix: var(--dark-input-bg-mix);

            --background-color: var(--dark-background-color);
            --text-color: var(--dark-text-color);

            --main-color: var(--dark-main-color);
            --main-text-color: var(--dark-main-text-color);

            --primary-color: var(--dark-primary-color);
            --primary-text-color: var(--dark-primary-text-color);

            --link-color: var(--dark-link-color);
            --link-text-color: var(--dark-link-text-color);

            --success-color: var(--dark-success-color);
            --success-text-color: var(--dark-success-text-color);

            --info-color: var(--dark-info-color);
            --info-text-color: var(--dark-info-text-color);

            --warning-color: var(--dark-warning-color);
            --warning-text-color: var(--dark-warning-text-color);
            
            --danger-color: var(--dark-danger-color);
            --danger-text-color: var(--dark-danger-text-color);

            --muted-color: var(--dark-muted-color);
            --muted-text-color: var(--dark-muted-text-color);

            --highlight-color: var(--dark-highlight-color);
            --highlight-text-color: var(--dark-highlight-text-color);
        }
    }



    * {
        --styled-background: color-mix(in hsl, var(--background-color), var(--text-color) var(--default-style-mix));
        --styled-text: var(--text-color);

        --medium-line-color: color-mix(in hsl, var(--background-color), var(--off) 50%);
        --faint-line-color: color-mix(in hsl, var(--background-color), var(--off) var(--faint-line-mix));
        --faint-background: color-mix(in hsl, var(--background-color), var(--off) var(--faint-bg-mix));
        --dark-background: color-mix(in hsl, var(--background-color), black var(--faint-bg-mix));

        --border-color: var(--medium-line-color);
        border-color: var(--border-color);
        scrollbar-color: var(--border-color) var(--background-color);
    }

    .faint {
        --border-color: var(--faint-line-color);
    }
}

@layer base {
    body, .numbas-container {
        --body-background-color: var(--background-color);
        background-color: var(--background-color);
        color: var(--text-color);

        & dialog {
            background-color: var(--background-color);
            color: var(--text-color);
        }

        & a {
            --highlight-amount: 0%;
            --off-amount: 0%;
            color: 
                color-mix(in hsl,
                    color-mix(in hsl, 
                        var(--link-color),
                        var(--highlight)
                        var(--highlight-amount)
                    ),
                    var(--off)
                    var(--off-amount)
                );

            &:hover {
                --highlight-amount: 20%;
                text-decoration: none;
            }
            &:focus {
                --highlight-amount: 40%;
                text-decoration: none;
            }
            &:active {
                --off-amount: 20%;
                background-image: none;
            }
            &:visited {
                --off-amount: 40%;
            }
        }

        & .success {
            color: color-mix(in hsl, var(--success-color), var(--text-color) var(--styled-text-mix));
            --styled-background: var(--success-color);
            --styled-text: var(--success-text-color);
        }

        & .primary {
            color: color-mix(in hsl, var(--primary-color), var(--text-color) var(--styled-text-mix));
            --styled-background: var(--primary-color);
            --styled-text: var(--primary-text-color);
        }

        & .info {
            color: color-mix(in hsl, var(--info-color), var(--text-color) var(--styled-text-mix));
            --styled-background: var(--info-color);
            --styled-text: var(--info-text-color);
        }

        & .warning {
            color: color-mix(in hsl, var(--warning-color), var(--text-color) var(--styled-text-mix));
            --styled-background: var(--warning-color);
            --styled-text: var(--warning-text-color);
        }

        & .danger {
            color: color-mix(in hsl, var(--danger-color), var(--text-color) var(--styled-text-mix));
            --styled-background: var(--danger-color);
            --styled-text: var(--danger-text-color);
        }

        & .muted {
            color: color-mix(in hsl, var(--muted-color), var(--text-color) var(--styled-text-mix));
            --styled-background: var(--muted-color);
            --styled-text: var(--muted-text-color);
        }

        button:is(*, .success, .info, .warning, .danger, .muted, .primary) {
            --highlight-amount: 0%;
            --off-amount: 0%;
            --mixed-styled-background: 
                color-mix(in hsl,
                    color-mix(in hsl, 
                        var(--styled-background),
                        var(--highlight) 
                        var(--highlight-amount)
                    ),
                    var(--off)
                    var(--off-amount)
                );
            background-color: var(--mixed-styled-background);
            --border-color: color-mix(in hsl, var(--mixed-styled-background), var(--off) 30%);
            border: var(--border-width) solid var(--border-color);
            color: var(--styled-text);

            &:hover {
                --highlight-amount: 20%;
            }
            &:focus {
                --highlight-amount: 40%;
            }
            &:active {
                --off-amount: 20%;
            }

            &.info {
                --styled-background: var(--info-color);
                color: var(--info-text-color);
            }

            &.success {
                --styled-background: var(--success-color);
                --styled-background: hsl(from var(--success-color) h s 40%);
                color: var(--success-text-color);
            }

            &.warning {
                --styled-background: var(--warning-color);
                color: var(--warning-text-color);
            }

            &.danger {
                --styled-background: var(--danger-color);
                --styled-background: hsl(from var(--danger-color) h s 30%);
                color: var(--danger-text-color);
            }

            &.primary {
                --styled-background: var(--primary-color);
                color: var(--primary-text-color);
            }

            &.link {
                background: none;
                border: none;
                color: var(--link-color);
            }

            &[disabled] {
                filter: brightness(50%) saturate(50%);
                text-decoration: line-through;
                opacity: 0.5;
            }

        }

        & .alert {
            --alert-background: color-mix(in hsl, var(--styled-background), var(--highlight) 25%);
            --border-color: color-mix(in hsl, var(--alert-background), var(--off) 10%);
            color: var(--styled-text);

            background-color: var(--alert-background);
            
            border: var(--border-width) solid var(--border-color);

            & > * {
                --background-color: var(--alert-background);
            }
        }
        
        & nav {
            --background-color: var(--main-color);
            background-color: var(--background-color);
            color: var(--main-text-color);

            & button {
                --background-color: var(--body-background-color);
            }
        }

        & hr {
            border: thin solid var(--border-color);
        }
        
        & input, select {
            border: thin solid var(--faint-line-color);
            border-bottom-color: var(--text-color);
            color: var(--text-color);
            --styled-background: var(--background-color);
            background-color: var(--background-color);
            background-color: color-mix(in hsl, var(--background-color), var(--styled-background) var(--input-bg-mix));
            --border-color: color-mix(in hsl, var(--styled-background), var(--off) 30%);
            border: var(--border-width) solid var(--border-color);
            
        }

        & .has-warnings:is(input, select), .has-warnings :is(input, select) {
            --styled-background: var(--warning-color);
            text-decoration: dashed underline;
            border-top-style: dashed;
            border-left-style: dashed;
            border-right-style: dashed;
        }

        & .has-errors:is(input, select), .has-errors :is(input, select) {
            --styled-background: var(--danger-color);
            text-decoration: wavy underline;
        }

        & .answered :is(input, select), .answered:is(input, select) {
            --styled-background: var(--feedback-color);
        }
            
        & pre, code, kbd {
            background: var(--faint-background);
            color: var(--text-color);
            border: 1px solid var(--faint-line-color);
        }

        & kbd {
            border: thin solid var(--border-color);
        }
    }
}

@layer force {
    .force-original-color {
        --background-color: var(--light-background-color);
        --body-background-color: var(--background-color);
        --text-color: var(--light-text-color);

        --main-color: var(--light-main-color);
        --main-text-color: var(--light-main-text-color);

        --primary-color: var(--light-primary-color);
        --primary-text-color: var(--light-primary-text-color);

        --link-color: var(--light-link-color);
        --link-text-color: var(--light-link-text-color);

        --success-color: var(--light-success-color);
        --success-text-color: var(--light-success-text-color);

        --info-color: var(--light-info-color);
        --info-text-color: var(--light-info-text-color);

        --warning-color: var(--light-warning-color);
        --warning-text-color: var(--light-warning-text-color);
        
        --danger-color: var(--light-danger-color);
        --danger-text-color: var(--light-danger-text-color);

        --muted-color: var(--light-muted-color);
        --muted-text-color: var(--light-muted-text-color);

        --highlight-color: var(--light-highlight-color);
        --highlight-text-color: var(--light-highlight-text-color);

        --highlight: var(--light-highlight);
        --off: var(--light-off);
        --styled-text-mix: var(--light-styled-text-mix);
        --default-style-mix: var(--light-default-style-mix);
        --faint-bg-mix: var(--light-faint-bg-mix);
        --faint-line-mix: var(--light-faint-line-mix);
        --input-bg-mix: var(--light-input-bg-mix);
    }
}

/*
Copyright 2011-25 Newcastle University

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

@layer theme {

    @media screen {
        :root {
            container-type: size;
        }
    }

    exam-container {
        display: block;
        min-height: var(--exam-height, 0);
    }

    #loading {
        display: grid;
        align-content: center;
        justify-content: center;
        justify-items: center;
        height: 100svh;
        gap: var(--spacing);

        exam-container & {
            height: revert;
            min-height: 100cqh;
            margin: var(--double-space);
        }

        & progress {
            width: 100%;
            border: thin solid var(--border-color);
            height: 1em;
            background: var(--background-color);
            accent-color: var(--main-color);
            color: var(--text-color);

            &::-moz-progress-bar {
                background-color: var(--main-color);
            }
        }
    }

    #die {
        padding: 0 var(--double-space);

        & .error {
            background: var(--pre-bg);
            color: var(--pre-color);
            padding: var(--spacing);

            &focus .stack {
                display: block;
            }

            & .stack {
                display: none;
                font-family: monospace;
            }
        }
    }

    @container (min-width: 480px) {
        .titleBits {
            margin: 0 var(--half-space);
        }
    }

    :is(body,exam-container).loaded #loading {
        display: none;
    }
    :is(body,exam-container):not(.loaded) #everything {
        display: none;
    }

    @media screen {
        #everything {
            display: grid;
        }
    }

    #everything {
        overflow-x: hidden;
        overflow-y: hidden;
        grid-gap: var(--spacing);

        grid-template: "main";

        font-weight: var(--font-weight);

        exam-container.show-nav & {
            grid-template: "navMenu main" / calc(16 * var(--scaled-text-size));
        }

        exam-container[data-navigatemode="menu"].show-nav & {
            grid-template:
                "topNav" min-content
                "main" 1fr
            ;
            grid-gap: 0;
        }

        & > main {
            grid-area: main;

            exam-container:is([data-navigatemode="menu"], .info-page) & {
                margin: 0 auto;
            }

            exam-container[data-navigatemode="menu"] & {
                width: 100%;
                max-width: var(--content-max-width);
            }

            & > :is(#questionContainer, #infoDisplay) {
                max-width: var(--content-max-width);
            }
            & > #questionContainer {
                padding-right: 0;

                & .copyright-footer {
                    margin-top: 0;
                }
            }
        }
    }

    #sideNav {
        grid-area: navMenu;
        display: flex;
        flex-direction: column;
        height: 100svh;
        border-style: solid;
        overflow-y: auto;
        border-width: 0 thin 0 0;
        --border-color: var(--faint-line-color);
        padding-bottom: var(--spacing);

        exam-container:not(.show-nav) & {
            display: none;
        }

        exam-container:not(.show-sidebar) & #hideNavMenuBtn {
            display: none;
        }

        & .stopWatch {
            display: flex;
            grid-gap: var(--half-space);
            justify-content: center;
            position: sticky;
            bottom: 0;
            padding: var(--half-space);
            background-color: var(--main-color);
        }

        & header {
            display: grid;
            grid-template: "brand close" "name close" max-content / 1fr min-content;
            gap: var(--spacing);
            padding: 0;
            grid-auto-flow: column;
            align-items: start;
            justify-items: start;

            & .exam-name {
                display: block;
                font-weight: var(--font-weight-bold);
                font-size: 1em;
                max-height: 5em;
                overflow-y: auto;
                padding: var(--half-space);
                margin: 0;
            }

        }

        & #exam-progress {
            width: 100%;
            margin: 0;
            height: var(--double-text-pad);
            display: block;
            border: none;
        }

        & #questionList {
            overflow-y: auto;
            background: var(--dark-background);
            box-shadow: inset 0px 0.5em 0.5em -0.5em black, inset 0px -1em 1em -1em black;
            padding: var(--spacing) 0;
            flex-grow: 1;

            & a {
                text-decoration: none;
            }

            .question-group-header {
                display: grid;
                grid-template-columns: 1fr auto;
                padding: var(--half-space) var(--quad-text-pad) var(--half-space) var(--half-space);    
                margin-top: var(--half-space);

                & h2 {
                    font-size: 1em;
                    font-weight: var(--font-weight-bold);
                    margin: 0;
                    text-align: center;
                }
            }

            & .introduction > a {
                padding-left: calc(1.5 * var(--scaled-text-size) + var(--quad-text-pad));
            }

            & > li > a {
                padding: var(--half-space) var(--quad-text-pad) var(--half-space) var(--half-space);
                margin-left: var(--half-space);
                cursor: pointer;
                border-left: thick solid transparent;

                &[aria-current] {
                    border-left-color: var(--text-color);
                }
            }


            & .questionSelector {
                .question-info {
                    display: flex;

                    & .feedback-icon {
                        padding: 0;
                        flex-basis: calc(1.5 * var(--scaled-text-size));
                    }
                    & .score {
                        flex-grow: 1;
                        text-align: end;
                    }
                }

                & .messages > * {
                    text-align: end;
                    font-size: smaller;

                    & .warning-icon {
                        font-size: calc(1 * var(--scaled-text-size));
                        margin: 0;
                    }
                }
            }

            .examScore {
                font-weight: var(--font-weight-bold);
                font-size: larger;
                display: flex;
                justify-content: space-between;
                padding: var(--half-space);
            }
        }

        & .navmenu-nav {
            margin-bottom: 0;

            & a {
                color: inherit;

                &[aria-current] {
                    background-color: var(--main-color);
                }
            }
        }

        & .logo {
            display: block;
            margin: 0;
            max-width: 100%;
            padding: var(--spacing) 0 0 var(--spacing);
        }

        & .navbar-toggle {
            margin-right: var(--spacing);
            margin-top: var(--half-space);
        }

    }

    #topNav {
        grid-area: topNav;
        margin-bottom: 0;
        display: none;

        align-items: center;
        gap: var(--half-space);
        padding: 0 var(--spacing);
        border-radius: 0;
        margin: 0;


        exam-container[data-navigatemode="menu"].show-nav & {
            display: flex;
        }

        exam-container[data-navigatemode="menu"] & {
            & .display-options {
                margin-left: auto;
            }
        }

        & .navbar-toggle {
            margin-left: auto;
        }
    }

    @media screen {
        #everything {
            height: 100svh;

            & > main {
                & #questionContainer,
                & #infoDisplay {
                    width: 100%;
                    max-width: min(1170px,100svw);
                    max-height: 100%;
                }

                & > #questionContainer {
                    padding-right: 0;
                    height: 100%;

                    & > .contentArea {
                        display: grid;
                        height: 100%;

                        & > #questionDisplay {
                            overflow: hidden;

                            & > .question-wrapper {
                                height: 100%;
                            }
                        }
                    }
                }
            }
        }
        .question, #infoDisplay {
            max-height: 100svh;
            height: 100%;
        }

    }

    @container (max-width: 992px) {
        #everything {
            padding-left: 0;
        }

        exam-container.show-sidebar {

            &.show-nav {
                & #everything {
                    grid-template: "navMenu";

                    & #sideNav {
                        display: block;
                    }

                    & > main {
                        display: none;
                    }
                }

            }

            & #topNav {
                display: none;
            }
        }

        exam-container.show-nav:not(.show-sidebar) #everything {
            grid-template: 
                "topNav" min-content
                "main" 1fr
            ;
            grid-gap: 0;

            & > #sideNav {
                display: none;
            }

            & > #topNav {
                display: flex;
            }
        }

        exam-container.show-nav #sideNav {
            border-width: 0;
        }

        exam-container #questionDisplay > .question-wrapper > .question .parts .part .submit-and-feedback {
            grid-template: 
                "submit"
                "score"
                "messages"
                / auto;
            justify-items: start;
            align-items: start;
        }
    }


    @media screen {
        exam-container.show-nav #questionDisplay .question .question-nav {
            display: flex;
            flex-wrap: wrap;
        }
    }

    input.jme {
        font-family: monospace;
    }

    .jme-preview {
        background-color: var(--faint-background);
        padding: var(--text-pad);
        display: inline-block;
        margin-left: var(--half-space);
    }

    matrix-input {
        display: inline-block;
    }

    .matrix-input {
        display: inline-block;
        vertical-align: middle;
        max-width: 100%;
        overflow-x: auto;
        overflow-y: hidden;

        & fieldset.matrix-wrapper {
            display: flex;
            flex-wrap: nowrap;

            & table.matrix {
                width: auto;
                display: inline-block;
                margin: var(--half-space) 0;

                & thead th {
                    background: none;
                    font-weight: var(--font-weight);
                }

                & td {
                    text-align: center;
                }
            }


            & > * {
                display: inline-block;
            }

            & .bracket {
                border-radius: 50%;
                width: 0.5em;

                &.left {
                    border-left: medium solid;
                    margin-right: -0.25em;
                    clip-path: inset(0 50% 0 0);
                }

                &.right {
                    border-right: medium solid;
                    margin-left: -0.25em;
                    clip-path: inset(0 0 0 50%);
                }
            }

        }

        & .matrix-size {
            background-color: var(--main-color);
            color: var(--main-text-color);
            border: thin solid var(--border-color);
            padding: var(--double-text-pad);
            margin-bottom: var(--double-text-pad);
            max-width: max-content;

            & label {
                margin-bottom: 0;
            }
        }
    }

    #saving {
        text-align: center;
        padding: var(--spacing);
        border-radius: var(--button-radius);
    }

    .mainDisplay {
        margin: 0 0;
        overflow-x: hidden;
        overflow-y: hidden;
        position: relative;

        & .copyright-footer {
            margin: var(--quad-space) var(--double-space) var(--spacing) var(--double-space);
            text-align: center;
            font-size: small;
            border-top: thin solid var(--medium-line-color);
            padding-top: var(--spacing);
        }
    }

    .main-content {
        overflow: visible auto;
        padding: 0 var(--spacing) var(--double-space) var(--spacing);
        position: relative;

        & :is(th, td) {
            background-color: var(--background-color);
            padding: var(--double-text-pad) var(--half-space);
            text-align: end;
        }
    }

    .feedback-icon {
        font-size: larger;
        display: inline-block;
        -webkit-text-stroke: 1px var(--text-color);
        text-align: center;
        width: 1em;
        height: 1em;

        &.icon-ok {
            color: var(--success-color);
        }
        &.partial {
            color: var(--muted-color);
        }
        &.icon-remove {
            color: var(--danger-color);
        }
        &.icon-exclamation-sign {
            color: var(--danger-color);
        }
        &.none {
            display: none;
        }

        .part .student.answer & {
            margin-left: var(--double-text-pad);
        }
    }

    #questionDisplay > .question-wrapper > .question {
        & > * > header > .question-header {
            margin: var(--spacing) 0 var(--double-space) 0;
        }

        & .statement {
            margin: var(--spacing) 0;
        }

        &.partsmode-explore .statement {
            margin-bottom: var(--quad-space);
        }


        & :is(.part .submit-and-feedback, .question-nav) .marks .feedback-icon {
            margin-left: 0.5em;
        }

        & .parts .part {
            &:not(.step) > .partheader {
                margin-left: calc(-1 * var(--half-space));
            }

            &.gap {
                margin-top: 0;
                margin-bottom: 0;

                & .warnings {
                    margin-top: -var(--half-space);
                }
            }

            .parts > .part-wrapper > &.has-name {
                margin-left: var(--spacing);
            }

            & > .answer fieldset > legend {
                border: none;
                margin: 0;
            }

            & > .student.answer {
                display: inline-block;

                & .show-cell-answer-state label {
                    border-bottom: thin solid var(--feedback-color);
                }

                :not(.dirty) &.answered {
                    --feedback-color: var(--info-color);

                    &[feedback-state="correct"] {
                        --feedback-color: var(--success-color);
                    }

                    &[feedback-state="wrong"] {
                        --feedback-color: var(--danger-color);
                    }

                    &[feedback-state="partial"] {
                        --feedback-color: var(--muted-color);
                    }

                    & .show-cell-answer-state .checked label {
                        accent-color: var(--feedback-color);
                    }

                    &:not([feedback-state='none']) .show-cell-answer-state .checked {
                        &.correct {
                            --feedback-color: var(--success-color);
                        }

                        &:not(.correct) {
                            --feedback-color: var(--danger-color);

                            & label {
                               border-bottom-style: dashed;
                           }
                        }
                    }
                }
            }

            &.type-matrix .student.answer {
                vertical-align: 1.25em;
            }

            &.type-gapfill > .prompt .part {
                display: inline-block;
                max-width: 100%;

                &.block {
                    display: block;
                }
            }

            & .feedback-icon {
                margin-left: var(--half-space);
            }

            & .warnings {
                position: absolute;
                z-index: 1;
                width: 20em;
                margin-top: var(--spacing);
                opacity: 0;
                display: inline-block;
                transition: opacity var(--transition-duration);

                & .warning {
                    margin: var(--text-pad);
                    display: block;
                }


                &.stick-right {
                    right: var(--half-space);
                }

                &.shown {
                    opacity: 1;
                }
            }

            & .correct.answer {
                vertical-align: bottom;
                margin: 0 0 0 var(--spacing);
                border: thin dashed var(--faint-line-color);
                padding: var(--half-space);
                display: inline-block;
                max-width: 100%;
                overflow-x: auto;
                overflow-y: hidden;
            }

            & .steps {
                padding: var(--half-space);
                margin-bottom: var(--spacing);
                margin-left: 0;

                & .partheader {
                    margin-top: var(--half-space);
                    font-size: calc(1.4 * var(--scaled-text-size));
                }

                & .prompt {
                    display: inline-block;
                    width: 100%;
                }
            }

            & .stepsBtn {
                margin-bottom: var(--spacing);
            }


            & .multiplechoice {
                margin-bottom: 0;
                display: inline-flex;
                flex-wrap: wrap;

                & .columns {
                    display: grid;
                    grid-gap: var(--double-text-pad) var(--spacing);
                }

                &.dropdownlist.print-only {
                    border: thin solid var(--text-color);
                    padding: 0 var(--half-space);
                    margin: var(--double-text-pad);

                    &.dropdownlist-option {
                        font-style: italic;
                        display: inline-block;
                    }
                }

                & li {
                    list-style: none;
                    padding-right: var(--double-space);
                    line-height: var(--line-height);
                }

                &:not(.columns) li {
                    margin-bottom: var(--spacing);
                }

                & p {
                    margin-left: var(--spacing);

                    &:first-child {
                        margin-top: calc(-1 * var(--line-height));
                    }
                }

                & .choice {
                    margin-right: var(--half-space);
                }
            }

            & select.multiplechoice {
                display: inline-block;
            }

            & .student.answer .multiplechoice.dropdownlist.print-only .dropdownlist-option {
                &.checked > span {
                    text-decoration: underline;
                }

                & ~ .dropdownlist-option::before {
                    content: '/';
                    margin: 0 var(--spacing);
                }

                &:not(.checked) {
                    display: none;
                }
            }


            &.gap .multiplechoice.columns {
                display: inline-grid;
            }


            &:is(.type-m_n_x,.type-1_n_2,.type-m_n_2) form {
                display: inline-block;
            }

            &.type-m_n_x .choices-grid {
                margin-left: var(--spacing);
                width: auto;

                & .answer-heading {
                    text-align: center;
                    font-weight: bold;
                    border-bottom: thin solid var(--medium-line-color);
                    border-left: none;
                }

                & th {
                    background: inherit;
                    font-weight: var(--font-weight);
                    text-align: center;
                }

                & tbody tr:nth-child(2n+1) :is(th, td):not(.choice-heading, .answer-heading) {
                    background: var(--faint-background);
                }

                & .choice-heading {
                    border-right: thin solid var(--medium-line-color);
                }

                & :is(th,td):not(:first-child, .answer-heading) {
                    border-left: thin dashed var(--faint-line-color);
                }

                & .choice {
                    text-align: start;
                    max-width: var(--readable-width);
                }

                & .option {
                    text-align: center;
                    padding: 0;

                    & > label {
                        width: 100%;
                        height: 100%;
                        display: block;
                        padding: 0.2em;
                        margin: 0;
                    }
                }
            }

            & .submit-and-feedback {
                margin: 1em 0;
                display: grid;
                grid-template: "messages submit" auto "messages score" 1fr / 1fr minmax(10em,min-content);
                align-items: start;
                gap: var(--spacing);

                &:not(.changed) .feedbackMessages {
                    border: none;
                    background: none;
                    color: var(--text-color);
                }

                & .submitPart {
                    grid-area: submit;
                }

                & .partFeedback {
                    grid-area: score;
                    text-align: end;

                    & .marks .score {
                        font-weight: var(--font-weight-bold);
                    }
                }

                & .feedbackMessages {
                    clear: both;
                    overflow-y: auto;
                    border-color: var(--main-color);
                    grid-area: messages;
                    min-height: 100%;
                    padding: var(--half-space) var(--spacing);
                    margin-bottom: 0;

                    .changed & {
                        border-radius: 3px;
                        min-height: revert;

                        & > summary {
                            margin-bottom: 0;
                        }
                    }

                    & > ol {
                        list-style-type: none;
                        margin: 0;
                    }

                    & > summary {
                        margin-bottom: var(--spacing);
                        cursor: pointer;
                    }

                    &.changed > summary {
                        font-weight: var(--font-weight-bold);
                    }

                    & .feedbackMessage {
                        display: grid;
                        grid-template-columns: auto 1fr;
                        justify-items: start;
                        gap: 0.5em;

                        & .message {
                            overflow: auto initial;
                            max-width: 100%;
                            max-height: 80svh;

                            & :is(svg, img) {
                                max-width: 100%;
                                max-height: 100%;
                            }

                            & .feedback-icon {
                                width: 1em;
                            }

                        }

                        & ~ .feedbackMessage {
                            margin-top: var(--half-space);
                        }
                    }
                }

                & .feedback-icon {
                    display: inline-block;
                }

            }

            &.step .submit-and-feedback .submitPart:not(:disabled) {
                --button-background-color: var(--background-color);
            }

            &.dirty {
                & > .submit-and-feedback > .feedbackMessages .out-of-date-message {
                    font-size: smaller;
                    font-style: italic;
                }
                & > .submit-and-feedback > .feedbackMessages .feedbackMessage,
                & .student.answer .feedback-icon {
                    opacity: 0.3;
                }
            }
            &:not(.dirty) .submit-and-feedback .submitPart {
                --styled-background: var(--background-color);
                color: var(--text-color);
            }

            &:not(.has-feedback-messages) .submit-and-feedback .feedbackMessages {
                visibility: hidden;
            }
            &.answered .submit-and-feedback .partFeedback {
                border-top-color: var(--main-color);
            }

            & .next-parts {
                text-align: start;
                margin-top: var(--double-space);
                margin-bottom: var(--double-space);

                & > .what-next, .dead-end {
                    font-weight: var(--font-weight-bold);
                }
                & > menu {
                    list-style: none;
                    padding-left: 0;

                    & > .next-part ~ .next-part {
                        margin-top: var(--spacing);
                    }
                }

                & .next-part-option.made {
                    font-style: italic;
                }
            }
        }

        & .explore-nav {
            & .pager {
                display: flex;
                margin: 0;
                gap: var(--spacing);
                align-items: center;
            }

            & .parts-tree {
                font-size: smaller;
                overflow-x: auto;
                display: flex;
                min-height: 0;
                margin: 0;
                align-items: baseline;

                & a {
                    flex-shrink: 0;
                    color: var(--text-color);
                    padding: var(--half-space);
                    display: inline-block;
                }

                & > .part-progress {
                    margin-right: var(--half-space);
                    text-align: end;
                }

                & .part {
                    display: flex;
                    margin: 0;

                    & .part a {
                        margin-left: var(--double-text-pad);
                    }
                }

                & menu {
                    list-style: '→';
                    padding-left: var(--spacing);
                    margin: 0;
                }

                & [aria-current] {
                    font-weight: var(--font-weight-bold);
                    font-style: italic;
                }

                & .name {
                    cursor: pointer;
                }
            }
        }

        & .question-nav {
            display: none;
            align-items: center;
            justify-content: center;

            & .marks {
                display: inline;
                vertical-align: middle;
                font-weight: var(--font-weight-bold);
            }

            & .submitBtn {
                width: 10em;
            }

            & .btn {
                margin: 0;
            }

            & .explore-breakdown {
                margin: var(--half-space);
                padding-top: var(--half-space);

                & th, td {
                    background: none;
                    line-height: var(--line-height);
                }

                & .total :is(th,td) {
                    border-top: medium solid white;
                }

                & td.name {
                    text-align: start;
                }
            }


        }
    }

    /* On narrow viewports, the submit button and score are on the same line, with feedback messages below. */
    @container (max-width: 80em) {
        .part .submit-and-feedback {
            grid-template: "submit score" auto "messages messages" 1fr / 1fr auto;
            justify-items: end;
            align-items: center;
            gap: calc(0.5 * var(--spacing)) var(--spacing);

            & .feedbackMessages {
                width: 100%;
            }
        }
    }

    /* Make the entire menu scroll on short viewports */
    @container (max-height: 45em) {
        #sideNav {
            overflow-y: auto;
        }
        #questionList {
            overflow: initial;
        }
        .menuButtons {
            padding-bottom: var(--spacing);
        }
    }

    #skills-table .active {
        font-weight: var(--font-weight-bold);
    }

    #learning-objective-list {
        overflow-y: auto;
        background: var(--dark-background);
        box-shadow: inset 0px 0.5em 0.5em -0.5em black, inset 0px -1em 1em -1em black;
        flex-grow: 1;
        
        display: grid;
        grid-template-columns: auto 1fr;
        grid-auto-rows: max-content;
        padding: var(--half-space) var(--spacing);
        
        & dt {
            grid-column: 1;
        }
        
        & dd {
            grid-column: 2;
            justify-self: end;
        }
        
        & :is(dt,dd):last-of-type {
            font-weight: var(--font-weight-bold);
        }
    }

    .menuButtons {
        margin: var(--spacing);
        display: flex;
        flex-wrap: wrap;
        gap: var(--spacing);
        justify-content: center;

        & button {
            margin: 0;

            &.thin-button {
                min-width: 6em;
            }
        }

        exam-container[data-navigatemode="menu"] & {
            flex-direction: column;
            align-items: center;

            & button.thin-button {
                min-width: 10em;
            }
        }
    }


    /* Menu mode question selection menu */
    #question-chooser {
        margin: var(--spacing) auto;
        width: 30em;
        max-width: 100%;
        --background-color: inherit;

        & table {
            & tr:not(:first-child) th {
                padding-top: var(--double-space);
            }

            & tr:first-child td {
                border-top: 0;
            }

            & th {
                border-top: 0;
            }

            & td {
                background: none;
            }

            & col.score {
                width: 8em;
            }
            & col.icon {
                width: 2em;
            }
            & .messages {
                text-align: end;
            }
        }
    }

    #infoDisplay {
        & h1 {
            padding: 0 var(--half-space);
        }

        & .info-buttons {
            margin-top: var(--spacing);
            text-align: center;
            display: grid;
            grid-gap: var(--half-space);
            grid-auto-columns: 1fr;
            justify-items: center;
            justify-content: center;
        }

        & > #menu {
            max-width: 100svw;

            & > .intro {
                margin: 0 var(--spacing) var(--quad-space) var(--spacing);
            }
        }
    }


    #frontpage {
        & table.summary {
            font-size: larger;

            & td {
                padding-left: var(--spacing);
            }
        }

        & input#begin-exam-student-name {
            min-width: 10em;
        }

        & #startBtn {
            font-size: calc(1.5 * var(--scaled-text-size));
            border-width: medium;
        }

        & .password {
            margin: var(--spacing) 0;
            display: flex;
            line-height: 2em;

            & input#begin-exam-password {
                flex-grow: 1;
                margin: 0 var(--half-space);
            }

            & .password-feedback {
              text-align: center;
              line-height: var(--line-height);
            }
        }


    }

    #results {
        & > p {
            margin-left: auto;
            margin-right: auto;
        }

        & #performance-summary {
            margin: var(--spacing) 0;

            & h2 {
                margin-top: 0;
                text-align: center;
            }
            & td {
                text-align: end;
            }
        }

        & #question-breakdown {
            & td.name {
                text-align: end;
            }

            & td.score-cell {
                text-align: start;
            }

            & .question:is(:hover, :focus-within) td {
                background-color: var(--highlight-color);
                --link-color: var(--text-color);
                cursor: pointer;
            }

            & .question-group-header th {
                text-align: center;
                padding-top: var(--spacing);
            }
        }

        & table tbody {
            td {
                border-bottom: thin solid var(--faint-line-color);
            }
            & th {
                border-bottom: thin solid var(--medium-line-color);
                vertical-align: middle;
            }

            & tr.total :is(td,th) {
                border-top: medium solid var(--medium-line-color);
                border-bottom: none;
            }
        }

        #finished-text {
            margin-top: var(--quad-space);
            font-size: calc(1.5 * var(--scaled-text-size));
            font-weight: var(--font-weight-bold);
        }
    }

    .diagnostic-feedback {
        margin: var(--spacing);
        padding: var(--half-space);
        background-color: var(--main-color);
        border-radius: var(--button-radius);
    }

    .content-area {
        & :is(menu, ul, ol) {
            margin-bottom: var(--half-space);
        }

        & :is(img, svg, object[type*="image"]) {
            background: white;
            color: black;
        }

        & img {
            color: black;
        }

        & thead th {
            background-color: var(--main-color);
            text-align: center;
        }
    }

    /* Try to allow scrolling for statement or prompt elements that are too wide */
    @media screen {
        .content-area > span > :is(p, div, table) {
            overflow-x: auto;
            overflow-y: hidden;
        }
    }

    .warning-icon {
        margin: 0 var(--double-text-pad);
        color: var(--danger-color);
    }

    input[type=text], input[type=number] {
        width: 4em;
        text-align: center;
    }

    .force-default-style {
        --text-size: 1;
        font-size: var(--scaled-text-size);
        font-family: var(--main-font);
        background-color: var(--background-color);
        color: var(--text-color);
    }

    #style-modal {

        & #text-size-preview {
            font-size: calc(var(--staged-text-size) * var(--base-text-size));
            font-weight: var(--staged-font-weight);
            width: calc(25 * var(--base-text-size));
            display: block;
            height: calc(3 * var(--base-text-size));
            overflow: hidden;
            line-height: calc(1 * var(--staged-text-size) * var(--base-text-size));
            max-width: 100%;
            font-family: var(--staged-main-font);
            grid-column: 2;
            text-align: start;
            padding: calc(0.5 * var(--base-text-size));

            .numbas-container[data-prefers-color-scheme="dark"] & {
                background: var(--dark-background-color);
                color: var(--dark-text-color);
            }
            .numbas-container[data-prefers-color-scheme="custom"] & {
                background: var(--custom-background-color);
                color: var(--custom-text-color);
            }
        }

        & .style-controls {
            display: flex;
            flex-direction: column;
            gap: var(--spacing);
            flex-wrap: wrap;
            
            & fieldset {
                display: grid;
                grid-template-columns: 10em auto auto;
                gap:var(--spacing);
                align-items: center;
                & label {
                    text-align: end;
                }
            }
        }
    }

    .numbas-container[data-invert-images="true"]:is([data-prefers-color-scheme="dark"],[data-prefers-color-scheme="custom"].dark-background) .content-area :is(img, svg, object[type*="image"]) {
        filter: invert(100%) hue-rotate(180deg);
    }

    @container (max-width: 768px) {
        #style-modal .style-controls {
            & fieldset {
                grid-template-columns: max-content;
                & label {
                    text-align: start;
                    font-weight: var(--font-weight-bold);
                }
            }
            & #text-size-preview {
                grid-column: 1;
                text-align: center;
                width: revert;
            }
        }
    }

    #next-actions-modal {
        & .feedback {
          margin-bottom: var(--spacing);
        }

        & .actions > li ~ li {
          margin-top: var(--spacing);
        }
    }

    #lightbox {
        width: 100svw;
        height: 100svh;
        background: none;
        border: none;

        & > :is(img, object[type*="image"]) {
          width: 100% !important;
          height: 100% !important;
          object-fit: contain;
          background: white;
          color: black;
        }
    }

    .lightbox-image-wrapper {
        display: inline-block;
        position: relative;

        &:not(:hover, :focus, :focus-within) button {
            opacity: 0;
        }
        &:focus-within {
            outline: thin solid var(--faint-background);
        }
        & > button {
            position: absolute;
            top: 0;
            right: 0;
            background: none;
            border: none;

            &:is(:hover, :focus) {
                filter: brightness(130%);
            }
            &:active {
                filter: brightness(80%);
            }
        }
    }

    .sr-only#skip-link:focus {
      top: 0;
      left: 0;
      width: auto;
      height: auto;
      margin: 0;
      padding: var(--half-space);
      background: var(--main-color);
      z-index: 2000;
      color: var(--text-color);
      clip: initial;
    }

    @media print {
        exam-container.no-printing {
            display: none;
        }
        
        .screen-only {
            display: none !important;
        }

        exam-container.show-nav #everything {
            grid-template: "main";
        }

        exam-container.no-printing-questions #questionContainer {
            display: none;
        }

        .no-printing-advice .adviceContainer {
            display: none;
        }

        #standalone-warning {
            display: none;
        }
        .question .parts {
            margin-left: var(--spacing);
        }
        .answered-state {
            display: none;
        }
        .parts-tree {
            display: none;
        }

        .question {
            overflow-y: hidden;	/* Fixes the fact that Chrome draws a scrollbar in questions, for some reason */
        }

        .penaltyMessage {
            display: none;
        }

        #finished-text {
            display: none;
        }

        .part .feedbackMessages {
            text-align: start;
            width: 100%;
        }

        input[type="text"], input[type="number"] {
            border: none;
            border-bottom: medium solid;
        }
        button, .btn {
            display: none !important;
        }
    }

}

/*!
 *  Font Awesome 3.0.2
 *  the iconic font designed for use with Twitter Bootstrap
 *  -------------------------------------------------------
 *  The full suite of pictographic icons, examples, and documentation
 *  can be found at: http://fortawesome.github.com/Font-Awesome/
 *
 *  License
 *  -------------------------------------------------------
 *  - The Font Awesome font is licensed under the SIL Open Font License - http://scripts.sil.org/OFL
 *  - Font Awesome CSS, LESS, and SASS files are licensed under the MIT License -
 *    http://opensource.org/licenses/mit-license.html
 *  - The Font Awesome pictograms are licensed under the CC BY 3.0 License - http://creativecommons.org/licenses/by/3.0/
 *  - Attribution is no longer required in Font Awesome 3.0, but much appreciated:
 *    "Font Awesome by Dave Gandy - http://fortawesome.github.com/Font-Awesome"

 *  Contact
 *  -------------------------------------------------------
 *  Email: dave@davegandy.com
 *  Twitter: http://twitter.com/fortaweso_me
 *  Work: Lead Product Designer @ http://kyruus.com
 */

@font-face{
  font-family:'FontAwesome';
  src:url('resources/iconfont/fontawesome.eot?v=3.0.1');
  src:url('resources/iconfont/fontawesome.eot?#iefix&v=3.0.1') format('embedded-opentype'),
  url('resources/iconfont/fontawesome.woff?v=3.0.1') format('woff'),
  url('resources/iconfont/fontawesome.ttf?v=3.0.1') format('truetype');
  font-weight:normal;
  font-style:normal }

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/* Use this file to add CSS rules affecting the appearance of your theme. */

/* If you're extending the default theme, these CSS properties control many of the colours.
 */
:root {
    --main-colour: #CBE6F7; /* This colour is used as the background of the sidebar, among other places. */
    --main-darker: #AAAAAA /* A darker shade of the main colour, used for borders. */

    /* The student can change the following colours. */
    --background-colour: white; /* The colour of the page background. */
    --text-colour: black; /* The colour of most text. */
}

/* remove unnecesary question name */
.question > * > header > .question-header { display: none;}

/* remove partial border around geogebra diagrams */
.GeoGebraFrame {border-width: 0px !important; background-color: var(--background-color) !important;}

/* permit slightly longer paragraphs */

.numbas-container, .force-default-style {
  --readable-width: 100ch; 
}

/* make headers a bit smaller, was 46,38,31,23,18,16 */
h1, .h1 {
    font-size: 30px;
    font-size: calc(var(--text-size) * 30px);
}

h2, .h2 {
    font-size: 26px;
    font-size: calc(var(--text-size) * 26px);
}

h3, .h3 {
    font-size: 22px;
    font-size: calc(var(--text-size) * 22px);
}

h4, .h4 {
    font-size: 20px;
    font-size: calc(var(--text-size) * 20px);
}

h5, .h5 {
    font-size: 18px;
    font-size: calc(var(--text-size) * 18px);
}

h6, .h6 {
    font-size: 16px;
    font-size: calc(var(--text-size) * 16px);
}