/* CTUET-inspired OJS Bootstrap 3 customizations */
:root {
    --ntl-main-color: #00529c;
    --ntl-hover-color: #00529c;
    --ntl-text-color: #00529c;
    --ntl-blue: #00529c;
    --ntl-footer-blue: #00529c;
    --ntl-light: #f5f5f5;
    --ntl-border: rgba(0, 0, 0, 0.12);
    --ntl-font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
    --ntl-font-heading: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    --ntl-font-content: Arial, "Arial Unicode MS", Helvetica, sans-serif;
    --ntl-font-serif: Georgia, "Times New Roman", Times, serif;
}

body {
    background: #fff;
    color: #212529;
    font-family: var(--ntl-font-base);
    font-size: 16px;
}

a {
    color: var(--ntl-text-color);
    transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

a:hover,
a:focus {
    color: var(--ntl-hover-color);
    text-decoration: none;
}

.pkp_structure_page {
    overflow-x: hidden;
}

.ntl-site-header {
    background: var(--ntl-blue);
}

.ntl-banner {
    width: 100%;
    margin: 0;
    background: var(--ntl-blue);
    text-align: center;
}

.ntl-banner-link {
    display: block;
    width: 100%;
    min-height: 120px;
    color: #fff;
}

.ntl-banner img {
    display: block;
    width: 100%;
    max-height: 320px;
    object-fit: cover;
}

.ntl-site-title {
    display: block;
    padding: 48px 20px;
    color: #fff;
    font-size: 30px;
    font-weight: 700;
    text-transform: uppercase;
}

.ntl-navigation.navbar {
    width: 100%;
    min-height: 0;
    margin: 0;
    padding: 10px 5%;
    border: 0;
    border-radius: 0;
    background: var(--ntl-main-color);
    font-family: var(--ntl-font-base);
    font-size: 16px;
}

.ntl-navigation .navbar-header {
    float: none;
}

.ntl-navigation .navbar-toggle {
    margin: 0 0 0 20px;
    border: 2px solid #06005b;
    border-radius: 5px;
    background: transparent;
    color: var(--ntl-light);
}

.ntl-navigation .navbar-toggle:hover,
.ntl-navigation .navbar-toggle:focus {
    background: var(--ntl-hover-color);
}

.ntl-navigation .navbar-toggle .icon-bar {
    background: var(--ntl-light);
}

.ntl-nav-collapse {
    padding: 0;
    border: 0;
    box-shadow: none;
}

.ntl-primary-menu,
.ntl-user-menu {
    display: flex;
    align-items: center;
    justify-content: center;
    float: none !important;
    margin: 0;
    padding-left: 0;
    list-style: none;
}

.ntl-primary-menu {
    width: auto;
}

.ntl-user-menu {
    margin-left: auto;
}

.ntl-navigation .nav > li {
    position: relative;
    margin: 0 6px;
    padding: 5px;
    border-radius: 5px;
}

.ntl-navigation .nav > li:hover,
.ntl-navigation .nav > li:focus-within,
.ntl-navigation .nav > li.open {
    background: var(--ntl-hover-color);
}

.ntl-navigation .nav > li > a,
.ntl-navigation .navbar-nav > li > a {
    padding: 4px 6px;
    color: var(--ntl-light);
    line-height: 1.5;
    background: transparent;
}

.ntl-navigation .nav > li > a:hover,
.ntl-navigation .nav > li > a:focus,
.ntl-navigation .navbar-nav > .open > a,
.ntl-navigation .navbar-nav > .open > a:hover,
.ntl-navigation .navbar-nav > .open > a:focus {
    color: #fff;
    background: transparent;
}

.ntl-navigation .dropdown-menu {
    top: calc(100% + 5px);
    min-width: max-content;
    padding: 13px;
    border: 0;
    border-radius: 0;
    background: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.ntl-navigation .dropdown-menu > li > a {
    padding: 7px 10px;
    color: #000;
}

.ntl-navigation .dropdown-menu > li > a:hover,
.ntl-navigation .dropdown-menu > li > a:focus {
    color: #fff;
    background: var(--ntl-text-color);
}

.ntl-search-wrap {
    float: right;
}

.ntl-search-wrap .navbar-form {
    display: flex;
    align-items: center;
    gap: 6px;
    margin: 0 0 0 8px;
    padding: 0;
    border: 0;
    box-shadow: none;
}

.ntl-search-wrap .form-control {
    height: 30px;
    border: 0;
    border-radius: 3px;
}

.ntl-search-wrap .btn {
    padding: 5px 10px;
    border-color: var(--ntl-text-color);
    color: var(--ntl-text-color);
}

.ntl-search-wrap .btn:hover,
.ntl-search-wrap .btn:focus {
    border-color: var(--ntl-text-color);
    background: var(--ntl-text-color);
    color: #fff;
}

.ntl-language-switcher {
    margin-left: 12px;
    white-space: nowrap;
}

.ntl-language-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 8px;
    border: 1px solid rgba(255, 255, 255, 0.75);
    border-radius: 999px;
    background: transparent;
    color: #fff;
    line-height: 1;
}

.ntl-language-toggle:hover,
.ntl-language-toggle:focus,
.ntl-language-switcher.open .ntl-language-toggle {
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
    outline: none;
}

.ntl-flag {
    display: inline-flex;
    width: 28px;
    height: 20px;
    border-radius: 3px;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.16);
    overflow: hidden;
    vertical-align: middle;
}

.ntl-flag svg {
    display: block;
    width: 100%;
    height: 100%;
}

.ntl-language-menu {
    min-width: 150px;
    padding: 6px;
}

.ntl-language-menu > li > a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 8px;
    border-radius: 4px;
    color: #111;
    font-family: var(--ntl-font-base);
    font-size: 13px;
}

.ntl-language-menu > li > a:hover,
.ntl-language-menu > li > a:focus,
.ntl-language-menu > li.active > a,
.ntl-language-menu > li.active > a:hover,
.ntl-language-menu > li.active > a:focus {
    background: var(--ntl-text-color);
    color: #fff;
}

.ntl-layout {
    width: auto;
    margin: 0 3%;
    display: grid;
    grid-template-columns: 74% 26%;
    background: #fff;
}

.ntl-content {
    grid-column: 1;
    width: auto;
    min-height: 500px;
    margin: 2% 3%;
    padding: 5px;
    float: none;
}

.ntl-sidebar {
    grid-column: 2;
    width: auto;
    margin: 0;
    padding: 20px;
    float: none;
    background: #fff;
}

.page-header {
    margin: 10px 0 30px;
    padding-bottom: 9px;
    border-bottom: 1px solid var(--ntl-border);
}

.page-header h1,
.page-header h2,
.page-header h3,
.page-header h4,
.page-header small,
.page_index_journal h2,
.current_issue h2,
.section h2 {
    color: #757575;
    font-family: var(--ntl-font-heading);
    font-weight: 700;
}

.journal-description,
.additional_content,
.page_index_journal,
.current_issue,
.issue-toc,
.article-abstract {
    font-family: var(--ntl-font-content);
    line-height: 1.6;
}

.homepage-image img {
    width: 100%;
    margin-bottom: 24px;
}

.current_issue .page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.current_issue .read-more {
    float: right;
    border-color: var(--ntl-text-color);
    background: #fff;
    color: var(--ntl-text-color);
}

.current_issue .read-more:hover,
.current_issue .read-more:focus {
    border-color: var(--ntl-text-color);
    background: var(--ntl-text-color);
    color: #fff;
}

.current_issue_title {
    color: var(--ntl-text-color);
    font-family: var(--ntl-font-heading);
    font-weight: 700;
}

.ntl-issue-overview {
    display: grid;
    grid-template-columns: 26% 74%;
    gap: 20px;
    margin: 20px 0;
    align-items: start;
}

.ntl-issue-volume {
    grid-column: 1;
}

.issue-toc .heading.row {
    display: block;
    margin: 0;
    color: var(--ntl-text-color);
}

.issue-toc .thumbnail {
    grid-column: auto;
    width: auto;
    margin: 0;
    padding: 5px;
    border: 0;
    float: none;
    position: relative;
}

.issue-toc .thumbnail img {
    max-width: 100%;
    height: auto;
}

.ntl-cover-download {
    position: absolute;
    right: 10px;
    bottom: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: rgba(0, 82, 156, 0.9);
    color: #fff;
    font-size: 13px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
    z-index: 2;
}

.ntl-cover-download svg {
    display: block;
    width: 17px;
    height: 17px;
    fill: currentColor;
}

.ntl-cover-download:hover,
.ntl-cover-download:focus {
    background: var(--ntl-text-color);
    color: #fff;
    text-decoration: none;
}

.issue-toc .issue-details {
    grid-column: auto;
    width: auto;
    float: none;
}

.issue-toc .sections {
    grid-column: 2;
    clear: none;
}

.issue-toc .section h2 {
    margin-left: 40px;
}

.ntl-issue-overview .section {
    margin-top: -30px;
}

.ntl-extra-article[hidden] {
    display: none !important;
}

.ntl-articles-toggle-wrap {
    display: flex;
    justify-content: center;
    margin: 16px 0 0;
}

.ntl-articles-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 130px;
    padding: 8px 18px;
    border: 1px solid var(--ntl-text-color);
    border-radius: 4px;
    background: #fff;
    color: var(--ntl-text-color);
    font-family: var(--ntl-font-heading);
    font-size: 14px;
    font-weight: 700;
    line-height: 1.4;
}

.ntl-articles-toggle:hover,
.ntl-articles-toggle:focus {
    background: var(--ntl-text-color);
    color: #fff;
    outline: none;
}

.ntl-articles-toggle-icon {
    display: inline-flex;
    width: 16px;
    height: 16px;
    transition: transform 0.2s ease;
}

.ntl-articles-toggle-icon svg {
    display: block;
    width: 100%;
    height: 100%;
    fill: currentColor;
}

.ntl-articles-toggle-icon.is-expanded {
    transform: rotate(180deg);
}

.media-list {
    display: block;
    padding-left: 1em;
    padding-bottom: 1em;
    font-size: 1.1em;
    font-weight: 400;
}

.article-summary.media {
    margin-bottom: 20px;
}

.article-summary .media-body {
    width: auto;
    margin-left: 40px;
    font-family: var(--ntl-font-heading);
    font-size: 16px;
}

.article-summary .media-heading {
    font-family: var(--ntl-font-heading);
    font-size: 15px;
    font-weight: 700;
    line-height: 22.5px;
}

.article-summary .media-heading a {
    font-family: var(--ntl-font-heading);
    font-weight: 700;
}

.article-summary .media-heading a {
    color: var(--ntl-text-color);
}

.article-summary .media-heading a:hover,
.article-summary .media-heading a:focus {
    color: var(--ntl-hover-color);
}

.article-summary .authors,
.article-details .authors {
    margin-top: 5px;
    color: #555;
    font-size: 14px;
    font-style: italic;
}

.article-summary .pages {
    color: #777;
    font-size: 14px;
}

.article-galleys {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
    align-items: center;
    margin-top: 1rem;
}

.article-galley-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.article-pdf-pages {
    color: #666;
    font-family: var(--ntl-font-base);
    font-size: 14px;
    line-height: 1;
    white-space: nowrap;
}

.galley-link,
.obj_galley_link,
.btn-primary {
    border-color: var(--ntl-text-color);
    background: #fff;
    color: var(--ntl-text-color);
    text-transform: uppercase;
}

.galley-link:hover,
.galley-link:focus,
.obj_galley_link:hover,
.obj_galley_link:focus,
.btn-primary:hover,
.btn-primary:focus {
    border-color: var(--ntl-text-color);
    background: var(--ntl-text-color);
    color: #fff;
}

.article-details > .row {
    display: grid;
    grid-template-columns: 32% 68%;
    margin: 0 4%;
}

.article-details .article-sidebar,
.article-details .col-md-8 {
    width: auto;
    float: none;
}

.article-details .article-sidebar {
    grid-column: 1;
}

.article-details .col-md-8 {
    grid-column: 2;
}

.article-details .page-header {
    color: var(--ntl-text-color);
    font-family: Helvetica, Arial, sans-serif;
    font-size: 2.2em;
    font-weight: 700;
}

.article-details,
.article-main,
.article-more-details {
    font-family: var(--ntl-font-content);
}

.list-group-item,
.panel-default {
    border-color: var(--ntl-main-color);
}

.panel-default > .panel-heading {
    border-color: var(--ntl-main-color);
    background: var(--ntl-main-color);
    color: var(--ntl-light);
    font-family: var(--ntl-font-serif);
}

.ntl-sidebar .block,
.ntl-sidebar .pkp_block,
.ntl-sidebar .panel {
    margin: 30px 0 10px;
    border: 1px solid var(--ntl-main-color);
    background: #fff;
}

.ntl-sidebar .title,
.ntl-sidebar .blockTitle,
.ntl-sidebar .panel-heading,
.ntl-sidebar h2,
.ntl-sidebar h3 {
    margin: 0;
    padding: 10px 20px;
    background: var(--ntl-main-color);
    color: var(--ntl-light);
    text-align: center;
    font-family: var(--ntl-font-serif);
    font-size: 20px;
}

.ntl-sidebar .content,
.ntl-sidebar .blockContent,
.ntl-sidebar .panel-body {
    margin: 10px;
}

.ntl-sidebar img {
    display: block;
    max-width: 90%;
    height: auto;
    margin: 0 auto 20px;
}

.ntl-sidebar-announcements {
    margin: 30px 0 10px;
    border: 1px solid var(--ntl-main-color);
    background: #fff;
}

.ntl-sidebar-announcements-title {
    margin: 0;
    padding: 10px 20px;
    background: var(--ntl-main-color);
    color: var(--ntl-light);
    text-align: center;
    font-family: var(--ntl-font-serif);
    font-size: 20px;
}

.ntl-sidebar-announcements-title a {
    color: var(--ntl-light);
}

.ntl-sidebar-announcements-list {
    margin: 10px;
}

.ntl-sidebar-announcement {
    margin-bottom: 10px;
    padding-bottom: 10px;
    border-bottom: 1px dashed var(--ntl-main-color);
}

.ntl-sidebar-announcement:last-child {
    margin-bottom: 0;
    border-bottom: 0;
}

.ntl-sidebar-announcement a {
    display: block;
    color: var(--ntl-text-color);
    font-size: 15px;
    line-height: 1.35;
}

.ntl-sidebar-announcement a:hover,
.ntl-sidebar-announcement a:focus {
    color: var(--ntl-hover-color);
}

.ntl-sidebar-announcement time {
    display: block;
    margin-top: 6px;
    color: #666;
    font-size: 12px;
}

footer[role="contentinfo"].ntl-footer,
.ntl-footer {
    margin-top: 0;
    max-height: 220px;
    padding: 20px 6%;
    border-top: 0;
    background: var(--ntl-footer-blue) !important;
    color: #fff !important;
    overflow: hidden;
}

.ntl-footer a {
    color: #fff;
}

.ntl-footer a:hover,
.ntl-footer a:focus {
    color: #fff;
    text-decoration: underline;
}

.ntl-footer-inner,
.ntl-footer-content {
    height: 100%;
    width: 100%;
}

.ntl-footer-content {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 48px;
    align-items: start;
    justify-content: center;
    max-width: 1180px;
    margin: -15px auto 0;
}

.ntl-footer-text {
    grid-column: 1 / -1;
    width: 100%;
    color: #fff;
    font-size: 90%;
    line-height: 1.5;
}

.ntl-footer-text * {
    color: inherit;
}

.ntl-footer .footer_area {
    display: block;
    width: 100%;
    max-height: 220px;
    padding: 18px 0 0 !important;
    background: transparent;
    color: #fff;
    overflow: hidden;
}

.ntl-footer .footer_area .footer_inner,
.ntl-footer .footer_area .row.footer_inner {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    gap: 48px;
    align-items: start;
    max-width: 1180px;
    width: 100%;
    margin: 0 auto !important;
}

.ntl-footer .footer_area .footer_inner::before,
.ntl-footer .footer_area .footer_inner::after {
    display: none;
}

.ntl-footer .footer_area .footer_inner > [class*="col-"] {
    width: auto;
    min-height: 0;
    padding: 0;
    float: none;
}

.ntl-footer .f_widget {
    margin: 0;
}

.ntl-footer .f_widget p,
.ntl-footer .f_widget li {
    margin: 0 0 6px;
    color: #fff;
    font-size: 13px;
    line-height: 1.35;
}

.ntl-footer .f_widget ul {
    margin: 0 0 0 18px;
    padding: 0;
}

.ntl-footer .f_widget a,
.ntl-footer .f_widget em,
.ntl-footer .f_widget strong {
    color: #fff !important;
}

.ntl-footer .f_title {
    margin: 0 0 8px !important;
}

.ntl-footer .f_title h4 {
    margin: 0;
    color: #fff !important;
    font-family: var(--ntl-font-heading);
    font-size: 15px;
    font-weight: 700;
    line-height: 1.4;
    text-transform: uppercase;
}

.ntl-footer .issue_cover_img {
    max-width: 120px;
    height: auto;
    margin-top: 4px;
}

.ntl-footer .footer_area > p:last-child {
    max-width: 1180px;
    margin: 10px auto 0 !important;
    padding: 8px 0 0 !important;
    border-top: 1px solid rgba(255, 255, 255, 0.25);
    color: #fff !important;
    font-size: 12px;
    line-height: 1.3;
    text-align: center;
}

@media (min-width: 768px) {
    .ntl-navigation .navbar-header {
        display: none;
    }

    .ntl-nav-collapse.collapse {
        display: flex !important;
        align-items: center;
        justify-content: center;
        height: auto !important;
    }
}

@media (max-width: 1000px) {
    .ntl-layout {
        margin: 0;
    }
}

@media (max-width: 768px) {
    .ntl-banner-link {
        min-height: 90px;
    }

    .ntl-banner img {
        max-height: 160px;
    }

    .ntl-site-title {
        padding: 28px 16px;
        font-size: 22px;
    }

    .ntl-navigation {
        padding: 8px 0;
    }

    .ntl-nav-collapse {
        width: 100%;
        margin: 8px 0 0;
    }

    .ntl-primary-menu,
    .ntl-user-menu {
        display: block;
        width: 100%;
        margin: 0;
        padding-left: 8px;
    }

    .ntl-navigation .nav > li {
        width: 90%;
        margin: 0;
        padding: 10px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.3);
        text-align: left;
    }

    .ntl-navigation .nav > li > a {
        font-size: 18px;
    }

    .ntl-navigation .dropdown-menu {
        position: static;
        width: 100%;
        min-width: 0;
        margin-top: 8px;
    }

    .ntl-search-wrap {
        float: none;
        width: 100%;
        margin: 10px 0;
    }

    .ntl-search-wrap .navbar-form {
        justify-content: center;
        padding: 0 8px;
    }

    .ntl-search-wrap .form-group {
        flex: 1;
        max-width: 80%;
    }

    .ntl-search-wrap .form-control {
        width: 100%;
        font-size: 13px;
    }

    .ntl-search-wrap .btn {
        padding: 8px;
        font-size: 10px;
    }

    .ntl-language-switcher {
        width: fit-content;
        margin: 10px 0 0 8px;
    }

    .ntl-layout {
        display: grid;
        grid-template-columns: 100%;
    }

    .ntl-content,
    .ntl-sidebar {
        grid-column: 1;
        margin: 0;
    }

    .ntl-sidebar {
        padding: 10px;
    }

    .ntl-issue-overview,
    .issue-toc .heading.row,
    .article-details > .row {
        grid-template-columns: 1fr;
        gap: 10px;
        margin: 10px 0;
    }

    .issue-toc .thumbnail,
    .issue-toc .issue-details,
    .ntl-issue-volume,
    .issue-toc .sections,
    .article-details .article-sidebar,
    .article-details .col-md-8 {
        grid-column: 1;
    }

    .issue-toc .thumbnail img {
        max-width: 60%;
    }

    .issue-toc .section h2 {
        margin-left: 10px;
    }

    .article-summary .media-body {
        margin: 0 0 30px;
        font-size: 14px;
    }

    .article-summary .media-heading {
        font-size: 18px;
    }

    .article-summary .authors,
    .article-summary .pages,
    .galley-link,
    .obj_galley_link {
        font-size: 12px;
    }

    .ntl-sidebar .block,
    .ntl-sidebar .pkp_block,
    .ntl-sidebar .panel {
        margin: 10px 0;
    }

    .ntl-sidebar img {
        max-width: 80%;
    }
}

@media (max-width: 670px) {
    footer[role="contentinfo"].ntl-footer,
    .ntl-footer {
        max-height: none;
        padding: 5%;
        text-align: center;
        overflow: visible;
    }

    .ntl-footer-content {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .ntl-footer-text {
        font-size: 70%;
    }

    .ntl-footer .footer_area {
        max-height: none;
        overflow: visible;
    }

    .ntl-footer .footer_inner {
        grid-template-columns: 1fr;
        gap: 16px;
        text-align: left;
    }

    .ntl-footer .f_widget p,
    .ntl-footer .f_widget li {
        font-size: 12px;
    }

    .ntl-footer .footer_area > p:last-child {
        font-size: 11px;
    }
}