body {
            background: #f5f7fb;
            font-family: "Segoe UI", Tahoma, sans-serif;
        }

        /* NAVBAR */
        .navbar {
            background: linear-gradient(90deg, #0d6efd, #0a58ca);
        }

        .navbar .nav-link {
            color: white !important;
            font-weight: 500;
            margin-left: 10px;
        }

        .navbar .nav-link:hover {
            opacity: .8;
        }

        .navbar-brand {
            color: white !important;
            font-weight: 700;
            font-size: 3rem;
        }

        /* HEADER BAR */
        .header-bar {
            background: linear-gradient(135deg, #8e0a59, #0a58ca);
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            color: white;
        }

        .header-bar .journal-title {
            color: white;
        }

        .header-bar .issn {
            background: rgba(255, 255, 255, .15);
            color: white;
        }

        .journal-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: #0a58ca;
            line-height: 1.3;
        }

        .issn {
            background: #eef4ff;
            display: inline-block;
            padding: 8px 14px;
            border-radius: 5px;
            font-size: 14px;
            margin-top: 10px;
            font-weight: 500;
        }

        .section-title {
            font-weight: 600;
            margin-bottom: 15px;
            color: #0a58ca;
        }

        .card {
            border: none;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            border-radius: 8px;
        }

        .list-group-item {
            border: none;
            border-bottom: 1px solid #eee;
            padding-left: 0;
        }

        .footer {
            background: linear-gradient(90deg, #0d6efd, #0a58ca);
            color: white;
            padding: 30px 0;
            margin-top: 40px;
        }

        .announcement-item {
            border-bottom: 1px solid #eee;
            padding-bottom: 8px;
        }

        .announcement-item:last-child {
            border-bottom: none;
        }

        .announcement-date {
            font-size: 12px;
            color: #0d6efd;
            font-weight: 600;
            margin-bottom: 3px;
        }

        .announcement-text {
            font-size: 14px;
            line-height: 1.4;
        }

        .quick-links {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .quick-link {
            display: block;
            padding: 8px 10px;
            background: #f8f9ff;
            border-radius: 6px;
            text-decoration: none;
            color: #333;
            font-size: 14px;
            border: 1px solid #eef1ff;
            transition: all .2s ease;
        }

        .quick-link:hover {
            background: #0d6efd;
            color: white;
            border-color: #0d6efd;
            transform: translateX(3px);
        }

        .article-item {
            padding: 12px 0;
            border-bottom: 1px solid #eee;
        }

        .article-item:last-child {
            border-bottom: none;
        }

        .article-title {
            font-weight: 600;
            color: #0a58ca;
            text-decoration: none;
            display: block;
        }

        .article-title:hover {
            text-decoration: underline;
        }

        .article-meta {
            font-size: 13px;
            color: #777;
            margin-top: 3px;
        }

        .editor-box {
            background: #f8f9ff;
            border-left: 4px solid #0d6efd;
            padding: 12px;
            margin-top: 10px;
            border-radius: 4px;
        }

        .contact-box {
            font-size: 14px;
            line-height: 1.6;
        }

        .contact-title {
            font-weight: 600;
            color: #0a58ca;
            margin-bottom: 6px;
        }

        .contact-card {
            padding: 18px;
            border: 1px solid #eef1ff;
            transition: .2s ease;
        }

        .contact-card:hover {
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
            transform: translateY(-3px);
        }

        .contact-role {
            font-size: 12px;
            color: #0d6efd;
            font-weight: 600;
            text-transform: uppercase;
            margin-bottom: 6px;
        }

        .contact-name {
            font-weight: 600;
            margin-bottom: 6px;
            color: #0a58ca;
        }

        .contact-info {
            font-size: 14px;
            line-height: 1.5;
            margin-bottom: 8px;
        }

        .contact-meta {
            font-size: 13px;
            color: #555;
        }

        .publisher-card {
            border: 1px solid #e9ecff;
            overflow: hidden;
        }

        .publisher-header {
            background: linear-gradient(90deg, #0d6efd, #0a58ca);
            color: white;
            padding: 12px 18px;
            font-weight: 600;
        }

        .publisher-body {
            padding: 20px;
            background: #f8f9ff;
        }

        .publisher-title {
            color: #0a58ca;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .publisher-address {
            font-size: 14px;
            line-height: 1.6;
            margin-bottom: 10px;
        }

        .publisher-contact {
            font-size: 14px;
            font-weight: 500;
        }

        /* ARCHIVE PAGE */

        .archive-year {
            margin-bottom: 20px;
        }

        .archive-year-title {
            background: #f5f7ff;
            padding: 10px 15px;
            font-weight: 600;
            border-left: 4px solid #0d6efd;
            margin-bottom: 8px;
            border-radius: 4px;
        }

        .archive-issues {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .archive-issue {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 14px;
            background: white;
            border: 1px solid #eee;
            border-radius: 6px;
            text-decoration: none;
            color: #333;
            transition: .2s ease;
        }

        .archive-issue:hover {
            border-color: #0d6efd;
            background: #f8f9ff;
            transform: translateX(4px);
        }

        .archive-issue span {
            font-size: 13px;
            color: #777;
        }

        /* issue page */
        .article-list-item {
            padding: 15px 0;
            border-bottom: 1px solid #eee;
            margin-bottom: 1.5rem;
        }

        .article-list-item:last-child {
            border-bottom: none;
        }

        .article-title {
            font-weight: 600;
            color: #0a58ca;
            text-decoration: none;
            display: block;
            margin-bottom: 4px;
        }

        .article-title:hover {
            text-decoration: underline;
        }

        .article-authors {
            font-size: 14px;
            color: #555;
        }

        .article-meta {
            font-size: 13px;
            color: #888;
        }

        .article-links {
            margin-top: 6px;
        }

        .article-links a {
            font-size: 15px;
            margin-right: 15px;
            text-decoration: none;
            font-weight: 500;
        }

        /* article page */
        .article-meta-line {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            font-size: 14px;
            color: #555;
        }

        .doi-box {
            background: #f8f9ff;
            border-left: 4px solid #0d6efd;
            padding: 8px 12px;
            font-size: 14px;
        }

        .keywords {
            font-size: 14px;
        }

        .pub-history {
            font-size: 13px;
            color: #666;
            background: #fafafa;
            padding: 8px 12px;
            border-left: 3px solid #6c757d;
        }

        /*footer*/
        .article-footer {
            font-size: 0.9rem;
            color: #666;
            border-top: 1px solid #eee;
            padding-top: 12px;
            line-height: 1.5;
        }

        /* breadcrumb */
        .article-breadcrumb {
            font-size: 14px;
            background: #f8f9fa;
            padding: 8px 12px;
            border-radius: 6px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-breadcrumb a {
            text-decoration: none;
            color: #0d6efd;
            font-weight: 500;
            transition: 0.2s ease;
        }

        .article-breadcrumb a:hover {
            color: #0a58ca;
            text-decoration: underline;
        }

        .article-breadcrumb .separator {
            color: #6c757d;
            font-size: 13px;
        }