@font-face {
        font-family: Router-Book;
        src: url("../font/Router-Book.woff") format("woff");
    }

    @font-face {
        font-family: Doko-Bold;
        src: url("../font/Doko-Bold.woff") format("woff");
    }

    html, body {
        min-width: 320px;
        min-height: 100vh;
    }

    body {
        border-left: 36px solid #afdff9;
        font-family: Router-Book, sans-serif;
    }

    h1, h2, h5 {
        font-family: Doko-Bold, serif;
    }

    hr {
        border: none;
        border-top: 2px dotted #ec656a;
        background-color: transparent;
        opacity: 1;
    }

    a {
        color: #31acf0;
        text-decoration: none;
    }

    .card {
        isolation: isolate;
    }

    .card-header, .card {
        border: none;
        background-color: transparent;
    }

    .card-header {
        padding-bottom: 0;
        padding-left: 0;
    }

    .card-header-tabs {
        margin-left: 0;
        margin-bottom: 0;
        gap: 15px;
    }

    .card-body {
        background-color: white;
        box-shadow: 0 0 20px lightgray;
        border-radius: 0 10px 10px 10px;
        /* this needed to display the shadow of the panel over the inactive tabs */
        z-index: 1;
        padding: 2rem;
        max-width: 1200px;
    }

    .nav-item {
        border-radius: 10px 10px 0 0;
        background-color: #f4f4f4;
        padding: 16px 30px;
        font-family: serif;
        font-weight: bold;
        height: 50px;
    }

    .nav-item-shadow {
        border-radius: 10px 10px 0 0;
        box-shadow: 0 0 20px lightgray;
    }

    .nav-tabs .nav-link {
        border: none;
        color: black;
        padding: 16px 30px;
        font-weight: bold;
        font-family: Doko-Bold, serif;
        position: relative; /* we need this for the z-index */
        z-index: 1; /* this is needed, so the buttons in the tab can cover icon above (effectively part of the icon is clickable) */
    }

    .nav-tabs .nav-item {
        position: relative;
        padding: 0;
    }

    .nav-item.active {
        box-shadow: 0 0 20px lightgray;
        background-color: white;
        /* -80px because the shadow is 20px, and the offset of the icon is 60px */
        clip-path: inset(-80px -20px 0px -20px);
        /* this needed to cover the shadow of the panel body */
        z-index: 2;
    }

    .nav-item.active div {
        isolation: isolate;
        position: relative;
        z-index: 2;
    }

    .nav-item.active a {
        isolation: auto;
    }

    .nav-tabs .icon {
        outline: none;
        background-color: transparent;
        border: none;
        height: 70px;
        width: 70px;
        position: absolute;
        margin: 4px auto;
        background-position: center;
        background-repeat: no-repeat;
        left: 0;
        right: 0;
        top: -60px;
    }

    #login-licencekey .icon {
        cursor:pointer;
    }

    #lmv-username-password-form .icon {
        background-image: url('../img/login-icon-classic-inactive.png');
    }

    #lmv-username-password-form.active .icon {
        background-image: url('../img/login-icon-classic-active.png');
    }

    #qr-code-form .icon {
        background-image: url('../img/login-icon-simplified-inactive.png');
    }

    #qr-code-form.active .icon {
        background-image: url('../img/login-icon-simplified-active.png');
    }

    #login-licencekey .icon {
        background-image: url('../img/login-icon-licencekey-inactive.png');
        display: inline-block; /* the icon has a fix size, and that can be only applied on inline-block, or block */
    }

    #login-licencekey.active .icon {
        background-image: url('../img/login-icon-licencekey-active.png');
    }

    #sidebar {
        background-color: transparent;
    }

    #form {
        width: 100%;
    }

    footer .list-inline-item + .list-inline-item::before {
        content: "|";
        margin: 0 0.5rem;
    }

    .form-control {
        border-radius: 20px;
    }

    button.form-control:focus {
        background-color: #afdff9;
    }

    .btn {
        background-color: #afdff9;
    }

    .normal-login-btn {
        width: 100%;
        height: 40px;
    }

    .horizontal-center {
        display: flex;
        justify-content: center;
    }

    img.kits {
        height: 30px;
        margin-top: -5px;
        margin-left: -10px;
    }

    a.kits {
        width: 100%;
        height: 40px;
        display: inline-block;
        line-height: 40px;
        border-radius: 20px;
        padding: 0 20px;
        border: solid 1px #31acf0;
        font-size: min(1rem, var(--bs-body-font-size));
        white-space: nowrap;
        color: #31acf0;
    }

    img.edulog {
        height: 20px;
        margin-top: -5px;
        margin-left: -10px;
    }

    a.edulog {
        width: 100%;
        height: 40px;
        display: inline-block;
        line-height: 40px;
        border-radius: 20px;
        padding: 0 20px;
        border: solid 1px #32e0a2;
        font-size: min(1rem, var(--bs-body-font-size));
        white-space: nowrap;
        color: #32e0a2;
    }

    img.switch {
        height: 30px;
        margin-top: -5px;
        margin-left: -10px;
    }

    a.switch {
        width: 100%;
        height: 40px;
        display: inline-block;
        line-height: 40px;
        border-radius: 20px;
        padding: 0 20px;
        border: solid 1px #dc9e4a;
        font-size: min(1rem, var(--bs-body-font-size));
        white-space: nowrap;
        color: #060b2e;
    }

    img.microsoft {
        height: 27px;
        margin-top: -5px;
        margin-left: -10px;
    }

    a.microsoft {
        width: 100%;
        height: 40px;
        display: inline-block;
        line-height: 40px;
        border-radius: 20px;
        padding: 0 20px;
        border: solid 1px #737373;
        font-size: min(1rem, var(--bs-body-font-size));
        white-space: nowrap;
        color: #737373;
    }

    .btn-secondary {
        border: solid 1px #31acf0;
        color: #31acf0;
        background-color: white;
    }

    .simplified-login form {
        background: url('../img/corner-bottom-left.png') bottom left, url('../img/corner-bottom-right.png') bottom right, url('../img/corner-top-left.png') top left, url('../img/corner-top-right.png') top right;
        background-repeat: no-repeat;
    }

    .modal {
        display: block;
    }

    .modal-dialog {
        max-width: min-content;
    }

    .modal-content {
        width: auto;
    }

    .avatar-grid {
        display: grid;
        grid-template-columns: repeat(4, 150px);
        column-gap: 30px;
        row-gap: 30px;
    }

    .avatar-grid button {
        border: solid 1px #31acf0;
        padding: 0;
        width: 150px;
        height: 150px;
    }

    .modal-header {
        border-bottom: none;
    }

    .modal-header .btn-close {
        position: absolute;
        top: -0.5rem;
        right: -0.5rem;
        opacity: 1;
        background: url('../img/close.png') no-repeat;
    }

    footer {
        max-width: 1200px;
    }

    #avatar-refresh {
        width: 32px;
        height: 32px;
        position: absolute;
        top: 10px;
        right: 50px;
    }

    #avatar-close {
        position: absolute;
        top: 10px;
        right: 10px;
        background: none;
        border: none;
        padding: 0;
    }

    .invalid-avatar {
        background-color: #ec656a;
        color: white;

        #avatar-close {
            filter:
                    drop-shadow(-1px -1px 0 white)
                    drop-shadow(1px -1px 0 white)
                    drop-shadow(-1px 1px 0 white)
                    drop-shadow(1px 1px 0 white);
        }
    }

    #selected-avatar {
        box-shadow: 0 0 15px 0 rgba(0, 0, 0, 0.5);
        border: solid 1px #31acf0;
    }

    #selected-avatar-decoration {
        width: 300px;
        height: 300px;
    }

    #avatar-popup-decoration {
        width: 150px;
        height: 150px;
    }

    .error .nav-item.active,
    .error .card-body
    {
        border-radius: 10px;
    }

    div.error-message {
        background-color: #ec656a;
        font-family: Doko-Bold, serif;
        color: white;
    }

    /* phones */
    @media (max-width: 767px) {
        #text, #qrform {
            width: 100%;
        }

        #form {
            width: 100%;
        }

        .nav-item {
            width: 70px;
            height: 80px;
            padding: 0 !important;
        }

        .nav-tabs .icon {
            position: static !important;
        }

        .avatar-grid {
            grid-template-columns: repeat(3, 150px) !important;
        }
    }

    /* tablet */
    @media (max-width: 1200px) {
        body {
            border-left: 36px solid #afdff9;
        }

        .card-body {
            padding: 1rem !important;
        }

        .avatar-grid {
            grid-template-columns: repeat(4, 150px);
        }
    }

    /* tables and desktop */
    @media (min-width: 768px) {
        #text, #qrform {
            width: 100%;
        }
    }

    /* phones */
    @media (max-width: 767px) {
        body {
            border-left: 16px solid #afdff9;
        }
    }