/* =====================================================
   GLOBAL FONT – TIMES NEW ROMAN (DUY NHẤT)
===================================================== */
html, body,
.pkp_structure_page,
.pkp_structure_main,
.pkp_structure_content,
.pkp_structure_sidebar,
.pkp_block,
.pkp_navigation_primary_row,
.pkp_nav_list,
#navigationPrimary,
.pkp_footer_content,
button, input, select, textarea {
    font-family: "Times New Roman", Times, serif !important;
}

/* =====================================================
   NAVBAR
===================================================== */
.pkp_navigation_primary_row {
    background: #B40000;
    position: relative;
    z-index: 9999;
}

#navigationPrimary a {
    color: #fff;
    padding: 8px 10px;
    font-size: 0.85rem;
    transition: 0.2s;
}

#navigationPrimary a:hover {
    color: #FFD6D6;
}

.pkp_nav_list ul a:hover {
    background: #8B0000;
}

/* SEARCH */
.pkp_navigation_search_wrapper {
    margin-left: auto;
    white-space: nowrap;
}

.pkp_navigation_search input {
    white-space: nowrap;
}

.pkp_navigation_search_wrapper a {
    color: #e6e6e6;
    font-weight: 700;
    text-transform: uppercase;
}

.pkp_navigation_search_wrapper a:hover {
    color: #fff;
    text-shadow: 0 0 6px rgba(255,255,255,0.4);
}

/* =====================================================
   LOGO
===================================================== */
/* ===== FULL WIDTH BANNER ===== */
.pkp_site_name {
    width: 100%;
    text-align: center;
}

.pkp_site_name .is_img img {
    width: 100%;
    height: auto;
    max-height: none; /* bỏ giới hạn chiều cao */
    display: block;
}

@media (min-width: 992px) {
    .pkp_site_name img {
        max-height: 180px;
    }
}

/* =====================================================
   LINKS
===================================================== */
a { color: #8B0000; }
a:hover { color: #B22222; }

/* =====================================================
   BLOCK
===================================================== */
.pkp_block .title {
    display: block;
    font-size: 1.143rem;
    text-align: center;
    color: #fff;
    background-color: #B40000;
    padding: 0.5em;
    font-weight: 700;
    text-transform: uppercase;
}

/* =====================================================
   ARTICLE PAGE
===================================================== */
.obj_article_details .page_title {
    font-weight: 700;
    font-size: 1.6rem;
    line-height: 1.5;
    text-align: justify;
}

/* ===== KHUNG BAO PDF FULL WIDTH ===== */
.obj_article_details .item.galleys {
    width: 100%;
    background: #f2f2f2;     /* nền xám */
    padding: 15px;
    box-sizing: border-box;
}

/* ===== CĂN GIỮA NÚT PDF ===== */
.obj_article_details .galleys_links {
    text-align: center;
}

/* ===== NÚT PDF ===== */
.obj_article_details .obj_galley_link {
    display: inline-block;
    font-family: "Times New Roman", Times, serif;
    font-weight: 700;
    text-transform: uppercase;

    background: #B40000;
    color: #fff;

    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;

    transition: 0.3s;
}

.obj_article_details .obj_galley_link:hover {
    background: #8f0000;
}

.obj_article_details .authors__name {
    font-weight: 700;
}

.obj_article_details .abstract,
.obj_article_details .references {
    text-align: justify;
}

.obj_article_details .keywords {
    font-style: italic;
}

.obj_article_details .item {
    padding: 1.143rem 2.143rem 0.443rem;
}

/* =====================================================
   ISSUE TOC
===================================================== */
.obj_issue_toc,
.obj_issue_toc * {
    font-family: "Times New Roman", Times, serif !important;
}

.obj_issue_toc .articles {
    margin-top: 0.286rem;
}

.obj_issue_toc .sections:not(:first-child) {
    margin-top: 0;
}

.obj_issue_toc .galleys,
.obj_issue_toc .section {
    margin: 0 -1.43rem;
}

/* =====================================================
   CONTENT SPACING
===================================================== */
.pkp_structure_main p {
    margin: 0.73rem 0;
    text-align: justify;
}

.pkp_structure_main h1,
.pkp_structure_main h2,
.pkp_structure_main h3,
.pkp_structure_main h4 {
    margin: 0.857rem 0 0.143rem;
}

/* =====================================================
   FOOTER
===================================================== */
.pkp_structure_footer_wrapper {
    background: #F2F2F2;
    padding: 15px 0;
    border-bottom: 8px solid #C40000;
}

.pkp_footer_content {
    display: flex;
    justify-content: space-between;
    max-width: 1100px;
    margin: auto;
}

.footer-col {
    width: 48%;
}

/* =====================================================
   SIDEBAR
===================================================== */
.pkp_structure_sidebar_right .pkp_block {
    padding: 0;
    margin: 0 0 15px 0;
    width: 100%;
}

.pkp_structure_sidebar_right .pkp_block .content {
    padding: 15px;
}

.pkp_structure_sidebar_right .pkp_block .content p,
.pkp_structure_sidebar_right .pkp_block .content div {
    background: #f5f5f5;
    padding: 10px;
    margin-bottom: 10px;
}

/* =====================================================
   BUTTON SUBMIT
===================================================== */
.block_make_submission {
    text-align: center;
    margin: 40px 0;
}

.block_make_submission a {
    display: inline-block;
    background: linear-gradient(135deg, #c40000, #8f0000);
    color: #fff;
    padding: 14px 32px;
    font-size: 0.95rem;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s ease;
}

.block_make_submission a:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(180,0,0,0.4);
}

.block_make_submission a:active {
    transform: translateY(0);
}

/* =====================================================
   CLEAN
===================================================== */
.pkp_brand_footer {
    display: none !important;
}

/* =====================================================
   RESPONSIVE
===================================================== */
@media (max-width: 768px) {
    .pkp_footer_content {
        flex-direction: column;
    }

    .footer-col {
        width: 100%;
    }
}

/* ===== CHỈ THU NHỎ ICON DOI ===== */
.block_custom img[src*="doi"] {
    max-width: 33%;
    height: auto;
    display: block;
    margin: 0 auto;
}