@charset "utf-8";
@import url("https://fonts.googleapis.com/css2?family=Merriweather:wght@400;600;700&family=Source+Sans+3:wght@400;600;700&display=swap");
/* IJOPCM journal stylesheet. Native OJS navigation and page structure retained. */
:root {
  --journal-navy: #12324b;
  --journal-teal: #14776f;
  --journal-ink: #263c49;
  --journal-muted: #60717d;
  --journal-line: #dce5e8;
  --journal-paper: #fff;
}
body { background: #f3f6f7; color: var(--journal-ink); font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif; font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: #126a78; text-decoration: none; }
a:hover { color: #10434f; text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid #c58b33; outline-offset: 4px; }
.pkp_structure_head { background: var(--journal-navy); border-bottom: 4px solid var(--journal-teal); }
.has_site_logo .pkp_head_wrapper { width: 100%; padding: 40px 0 0; }
.pkp_site_name_wrapper { height: auto; background: transparent; }
.pkp_site_name { position: relative; left: auto; right: auto; padding: 26px 0 30px; white-space: normal; overflow: visible; }
.pkp_site_name .is_img { display: flex; align-items: center; gap: 26px; margin: 0; }
.pkp_site_name .is_img img { width: 100px; height: 100px; max-height: none; flex: 0 0 auto; border-radius: 50%; background: white; box-shadow: 0 0 0 6px #ffffff12; }
.pkp_site_name .is_img::after { content: "International Journal of Open Problems in Computer Science and Mathematics\A Print ISSN: 1998-6262\A Online ISSN: 2079-0376"; white-space: pre-line; max-width: 820px; font: 600 clamp(20px, 2.3vw, 32px)/1.28 "Merriweather", Georgia, "Times New Roman", serif; letter-spacing: -.3px; color: white; }
.pkp_site_name a:hover { text-decoration: none; }
.pkp_site_name .is_text { color: white; white-space: normal; }
.pkp_navigation_primary_row { background: #fff; }
.pkp_navigation_primary_wrapper { background: #fff; }
.pkp_navigation_primary > li > a { color: var(--journal-navy); font-size: 14px; font-weight: 600; padding: 18px 18px; margin: 0; border-bottom: 3px solid transparent; }
.pkp_navigation_primary > li > a:hover, .pkp_navigation_primary > li > a:focus { color: var(--journal-teal); border-color: var(--journal-teal); background: #f0f7f6; text-decoration: none; }
.pkp_navigation_primary ul { background: white; border: 1px solid var(--journal-line); box-shadow: 0 10px 24px #12324b14; }
.pkp_navigation_primary ul a { color: var(--journal-navy); }
.pkp_navigation_search_wrapper a { color: var(--journal-navy); }
.pkp_navigation_user > li > a { color: #e3edf1; font-size: 12px; }
.pkp_structure_content { padding-top: 36px; padding-bottom: 48px; }
.pkp_structure_main { background: white; border: 1px solid var(--journal-line); border-radius: 6px; padding: 32px; }
.pkp_structure_main::before, .pkp_structure_main::after, .pkp_structure_sidebar::before { display: none; }
.pkp_structure_main p { text-align: left; line-height: 1.8; margin: 0 0 18px; }
.pkp_structure_main h1, .pkp_structure_main h2, .pkp_structure_main h3, .pkp_structure_main h4 { color: var(--journal-navy); line-height: 1.3; }
.pkp_structure_main h1, .pkp_structure_main h2 { font-family: "Merriweather", Georgia, "Times New Roman", serif; font-weight: 600; letter-spacing: -.4px; }
.pkp_structure_main h1 { font-size: 32px; }
.pkp_structure_main h2 { font-size: 28px; }
.pkp_structure_main .page_index_journal > section { margin: 0 0 36px; padding: 0 0 32px; border-bottom: 1px solid var(--journal-line); }
.homepage_about > h2 { margin: 0 0 24px; padding-bottom: 16px; border-bottom: 2px solid var(--journal-teal); }
.pkp_structure_main table { width: 100%; border-collapse: collapse; font-size: 14px; line-height: 1.6; margin: 20px 0 28px; border: 1px solid var(--journal-line); }
.pkp_structure_main table th { background: #eaf1f4; color: var(--journal-navy); font-weight: 600; text-align: left; }
.pkp_structure_main table td, .pkp_structure_main table th { padding: 12px 16px; border-bottom: 1px solid var(--journal-line); vertical-align: top; overflow-wrap: anywhere; }
.homepage_about td:first-child { width: 28%; color: var(--journal-navy); background: #f8fafb; }
.pkp_structure_main hr { border: 0; border-top: 1px solid var(--journal-line); margin: 28px 0; }
.homepage_about ul { padding-left: 22px; }
.homepage_about li { margin-bottom: 8px; padding-left: 4px; }
.homepage_about li::marker { color: var(--journal-teal); }
.homepage_about li p { margin-bottom: 8px; }
.obj_article_summary, .obj_issue_summary { background: #fff; border: 1px solid var(--journal-line); border-left: 3px solid #9cbcbf; border-radius: 4px; padding: 22px; margin-bottom: 18px; box-shadow: none; }
.obj_article_summary .title a, .obj_issue_summary .title a { font: 600 21px/1.4 "Merriweather", Georgia, "Times New Roman", serif; color: var(--journal-navy); }
.obj_article_summary .meta, .obj_article_summary .authors, .obj_article_summary .pages { color: var(--journal-muted); font-size: 14px; }
.obj_galley_link { border: 1px solid #a5c5c9; color: #155f68; background: #f2f8f8; border-radius: 4px; box-shadow: none; font-weight: 600; padding: 5px 14px; }
.obj_galley_link:hover { background: #e3f0ef; color: var(--journal-navy); }
.pkp_block { background: #fff; border: 1px solid var(--journal-line); border-radius: 6px; padding: 22px; margin: 0 0 20px; box-shadow: none; font-size: 14px; }
.pkp_block .title { display: block; font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif; font-size: 12px; line-height: 1.5; font-weight: 700; letter-spacing: 1.1px; text-transform: uppercase; color: var(--journal-navy); border-bottom: 1px solid var(--journal-line); margin: 0 0 16px; padding: 0 0 12px; }
.pkp_block .content { line-height: 1.65; }
#customblock-menu a { display: block; padding: 8px 0; border-bottom: 1px solid #edf1f3; color: #344f61; }
#customblock-menu a:hover { color: var(--journal-teal); }
.block_make_submission { background: var(--journal-navy); border-color: var(--journal-navy); }
.block_make_submission .content a { display: block; background: var(--journal-teal); color: white; border: 1px solid #ffffff40; border-radius: 4px; padding: 13px 10px; font-size: 12px; letter-spacing: .7px; text-align: center; box-shadow: none; }
.block_make_submission .content a:hover { background: #0f625c; }
.pkp_structure_main input:not([type=checkbox]):not([type=radio]):not([type=submit]), .pkp_structure_main select, .pkp_structure_main textarea { max-width: 100%; border: 1px solid #adbec7; border-radius: 4px; background: #fff; padding: 10px 12px; color: var(--journal-ink); }
.pkp_structure_main button, .pkp_structure_main input[type=submit], .pkp_structure_main .submit { background: var(--journal-teal); color: white; border: 1px solid var(--journal-teal); border-radius: 4px; box-shadow: none; text-shadow: none; }
.pkp_structure_footer_wrapper { background: var(--journal-navy); color: #d8e4eb; border-top: 4px solid var(--journal-teal); }
.pkp_footer_content { float: none; width: 100%; padding: 0; }
.ijopcm-footer { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 32px; padding: 44px 0 28px; }
.ijopcm-footer-column { min-width: 0; }
.pkp_structure_footer_wrapper h3 { font-size: 14px; color: #fff; margin: 0 0 16px; }
.pkp_structure_footer_wrapper ul { list-style: none; padding: 0; margin: 0; }
.pkp_structure_footer_wrapper li { margin-bottom: 10px; }
.pkp_structure_footer_wrapper a { color: #d4e3eb; font-size: 13px; }
.ijopcm-footer-bottom { padding: 20px 0; border-top: 1px solid #ffffff26; font-size: 12px; }
.pkp_brand_footer { display: none; }
.pkp_brand_footer img { max-width: 100px; background: white; padding: 8px; border-radius: 4px; }
@media (min-width: 992px) {
  .pkp_structure_content.has_sidebar { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 28px; align-items: start; }
  .pkp_structure_content::before, .pkp_structure_content::after { display: none; }
  .pkp_structure_content.has_sidebar > .pkp_structure_main, .pkp_structure_content.has_sidebar > .pkp_structure_sidebar { width: auto; float: none; min-width: 0; }
  .pkp_navigation_user_wrapper { top: 0; }
}
@media (max-width: 991px) {
  .has_site_logo .pkp_head_wrapper { padding: 0; }
  .pkp_site_name_wrapper { width: 100%; padding: 0 24px; }
  .pkp_site_name { padding: 24px 0 24px 52px; }
  .pkp_site_name .is_img { gap: 18px; }
  .pkp_site_name .is_img img { width: 72px; height: 72px; }
  .pkp_site_nav_toggle { top: 50%; transform: translateY(-50%); left: 16px; border: 1px solid #ffffff40; border-radius: 4px; background: transparent; box-shadow: none; }
  .pkp_site_nav_menu { background: var(--journal-navy); }
  .pkp_navigation_primary_row, .pkp_navigation_primary_wrapper { background: transparent; }
  .pkp_site_nav_menu .pkp_navigation_primary > li > a, .pkp_navigation_search_wrapper a { color: white; }
  .pkp_structure_content { width: calc(100% - 40px); }
  .pkp_structure_main { width: 100%; padding: 26px; }
  .pkp_structure_sidebar { margin-top: 24px; }
  .pkp_structure_footer { width: calc(100% - 48px); }
  .ijopcm-footer { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 540px) {
  .pkp_site_name_wrapper { padding: 0 16px; }
  .pkp_site_name { padding: 22px 0 22px 42px; }
  .pkp_site_name .is_img { gap: 12px; align-items: flex-start; }
  .pkp_site_name .is_img img { width: 48px; height: 48px; }
  .pkp_site_name .is_img::after { font-size: 18px; line-height: 1.35; }
  .pkp_site_nav_toggle { left: 8px; }
  .pkp_structure_content { width: calc(100% - 24px); padding-top: 20px; }
  .pkp_structure_main { padding: 18px; }
  .pkp_structure_main h2 { font-size: 25px; }
  .pkp_structure_main table { font-size: 13px; }
  .pkp_structure_main table td, .pkp_structure_main table th { padding: 10px; }
  .homepage_about td:first-child { width: 34%; }
  .obj_article_summary { padding: 16px; }
  .obj_article_summary .title a { font-size: 19px; }
  .ijopcm-footer { grid-template-columns: 1fr; gap: 22px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; animation: none !important; } }
/* Compact masthead: title and ISSNs have independent type sizes. */
.pkp_site_name .is_img {
  display: grid;
  grid-template-columns: auto minmax(0, 820px);
  column-gap: 22px;
  row-gap: 8px;
  align-items: center;
}
.pkp_site_name .is_img img {
  grid-column: 1;
  grid-row: 1 / 3;
  width: 80px;
  height: 80px;
}
.pkp_site_name .is_img::before {
  content: "International Journal of Open Problems in Computer Science and Mathematics";
  grid-column: 2;
  grid-row: 1;
  align-self: end;
  color: #fff;
  font: 600 clamp(18px, 2vw, 26px)/1.3 "Merriweather", Georgia, "Times New Roman", serif;
  letter-spacing: -.3px;
}
.pkp_site_name .is_img::after {
  content: "Print ISSN: 1998-6262  |  Online ISSN: 2079-0376";
  grid-column: 2;
  grid-row: 2;
  align-self: start;
  white-space: pre-line;
  font: 400 13px/1.6 "Source Sans 3", "Segoe UI", Arial, sans-serif;
  letter-spacing: .2px;
  color: #d8e4eb;
}
@media (max-width: 991px) {
  .pkp_site_name .is_img img { width: 60px; height: 60px; }
  .pkp_site_name .is_img { column-gap: 16px; }
}
@media (max-width: 540px) {
  .pkp_site_name .is_img img { width: 44px; height: 44px; }
  .pkp_site_name .is_img { column-gap: 12px; }
  .pkp_site_name .is_img::before { font-size: 17px; }
  .pkp_site_name .is_img::after { font-size: 12px; }
}


/* Keep footer content comfortably inset at every screen width. */
.pkp_structure_footer {
  box-sizing: border-box;
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 36px;
}
.ijopcm-footer { padding-top: 44px; padding-bottom: 32px; }
.ijopcm-footer-bottom { padding-top: 24px; padding-bottom: 32px; }
@media (max-width: 540px) {
  .pkp_structure_footer { padding-inline: 24px; }
}
/* Larger journal seal on desktop screens. */
@media (min-width: 992px) {
  .pkp_site_name .is_img img { width: 130px; height: 130px; }
}
/* Blue palette coordinated with the journal logo. */
:root {
  --journal-navy: #07549a;
  --journal-teal: #087fbd;
  --journal-ink: #263c49;
  --journal-muted: #60717d;
  --journal-line: #d8e5f0;
}
html, body, .pkp_structure_page { background: #eef5fb; }
.pkp_structure_head, .pkp_structure_footer_wrapper { background: #07549a; }
.pkp_structure_head, .pkp_structure_footer_wrapper { border-color: #159bd2; }
a { color: #096eaf; }
a:hover { color: #054b87; }
.pkp_navigation_primary > li > a:hover,
.pkp_navigation_primary > li > a:focus { background: #eaf4fc; }
.pkp_structure_main table th { background: #e7f1fa; }
.homepage_about td:first-child { background: #f4f8fc; }
.obj_article_summary, .obj_issue_summary { border-left-color: #91bfdf; }
.obj_galley_link { color: #07549a; background: #eef6fc; border-color: #a3c8e3; }
.obj_galley_link:hover { background: #dfedf9; }
.block_make_submission .content a:hover { background: #066ba4; }
@media (max-width: 991px) {
  .pkp_site_nav_menu { background: #07549a; }
}
/* Volumes page: compact, consistent archive typography. */
.pkp_page_Volumes .pkp_structure_main .page {
  font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.65;
}
.pkp_page_Volumes .pkp_structure_main .page_title {
  font-size: 28px;
  margin: 0 0 24px;
  padding-bottom: 16px;
  border-bottom: 2px solid #087fbd;
}
.pkp_page_Volumes .pkp_structure_main .obj_issue_summary {
  border: 0;
  border-radius: 0;
  padding: 0;
  margin: 0;
  background: transparent;
  box-shadow: none;
}
.pkp_page_Volumes .pkp_structure_main .description { margin: 0; padding: 0; }
.pkp_page_Volumes .pkp_structure_main .page h2 {
  font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.5;
  letter-spacing: 0;
  margin: 24px 0 10px;
}
.pkp_page_Volumes .pkp_structure_main .page h2:has(a) { margin: 0; }
.pkp_page_Volumes .pkp_structure_main .page p { margin: 0; font-size: 15px; }
.pkp_page_Volumes .pkp_structure_main .page h2 a,
.pkp_page_Volumes .pkp_structure_main .page p a {
  display: block;
  padding: 12px 14px;
  border-bottom: 1px solid #e0e9f1;
  border-left: 3px solid transparent;
  border-radius: 0;
  font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif;
  font-size: 15px;
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0;
  color: #175d92;
  overflow-wrap: anywhere;
  text-decoration: none;
}
.pkp_page_Volumes .pkp_structure_main .page h2 a:hover,
.pkp_page_Volumes .pkp_structure_main .page p a:hover {
  background: #edf5fc;
  border-left-color: #087fbd;
  color: #064777;
  text-decoration: underline;
}
.pkp_page_Volumes .pkp_structure_main .page p > strong:not(:has(a)),
.pkp_page_Volumes .pkp_structure_main .page p > a:only-child:not(:has(*)) {
  font-weight: 600;
}
.pkp_page_Volumes .pkp_structure_main .page p > strong:not(:has(a)) {
  display: block;
  margin-top: 26px;
  padding: 10px 14px;
  background: #edf3f8;
  border-left: 3px solid #087fbd;
  font-size: 18px;
  color: #123f61;
}
.pkp_page_Volumes .pkp_structure_main .page h2:not(:has(a)) {
  padding: 10px 14px;
  background: #edf3f8;
  border-left: 3px solid #087fbd;
  color: #123f61;
}
@media (max-width: 540px) {
  .pkp_page_Volumes .pkp_structure_main .page_title { font-size: 25px; }
  .pkp_page_Volumes .pkp_structure_main .page h2 a,
  .pkp_page_Volumes .pkp_structure_main .page p a { padding: 10px; font-size: 14px; }
}