/* =========================================================
   JACIS — Journal of Applied Computing & Intelligent Systems
   Design tokens
   ========================================================= */
:root {
  /* Color */
  --paper:        #EEF1F6;
  --surface:      #FFFFFF;
  --ink:          #15233E;
  --ink-soft:     #3C4A68;
  --text:         #4C5670;
  --text-muted:   #7C879C;
  --line:         #D6DCE6;
  --line-strong:  #B9C2D2;
  --green:        #2E6F4E;
  --green-soft:   #E3EFE8;
  --gold:         #B6841E;
  --gold-soft:    #F6EFDC;

  /* Type */
  --font-display: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-body:    "Source Sans 3", -apple-system, Segoe UI, sans-serif;
  --font-mono:    "IBM Plex Mono", "Courier New", monospace;

  /* Layout */
  --max: 1180px;
  --radius: 3px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--paper);
  line-height: 1.6;
  font-size: 16px;
}

img, svg { display: block; max-width: 100%; }

a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.2;
  margin: 0;
  font-weight: 600;
}

/* Visible keyboard focus everywhere */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

.skip-link {
  position: absolute;
  left: -999px;
  background: var(--ink);
  color: #fff;
  padding: 8px 16px;
  z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

/* =========================================================
   Eyebrow / mono labels
   ========================================================= */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--green);
  font-weight: 600;
}
.eyebrow.muted { color: var(--text-muted); }

/* =========================================================
   Header / Navigation
   ========================================================= */
.topbar {
  background: var(--ink);
  color: #cdd6e8;
  font-family: var(--font-mono);
  font-size: 12.5px;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 7px;
  padding-bottom: 7px;
  flex-wrap: wrap;
  gap: 6px;
}
.topbar a { color: #cdd6e8; }
.topbar a:hover { color: #fff; }
.topbar .issn { letter-spacing: 0.06em; }
.topbar .topbar-links { display: flex; gap: 18px; }

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand .brand-mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: 0.01em;
}
.brand .brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  margin: 4px 0;
}

.main-nav ul {
  display: flex;
  gap: 26px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
.main-nav a {
  color: var(--ink-soft);
  font-size: 14.5px;
  font-weight: 600;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
}
.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--gold);
  text-decoration: none;
}

@media (max-width: 880px) {
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    width: 100%;
    order: 3;
  }
  .main-nav.open { display: block; }
  .main-nav ul {
    flex-direction: column;
    gap: 4px;
    border-top: 1px solid var(--line);
    padding-top: 12px;
    margin-top: 12px;
  }
  .site-header .container { flex-wrap: wrap; }
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  padding: 11px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-primary {
  background: var(--green);
  color: #fff;
}
.btn-primary:hover { background: #255c40; text-decoration: none; }
.btn-secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.45);
}
.btn-secondary:hover { border-color: #fff; text-decoration: none; }
.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--line-strong);
}
.btn-ghost:hover { border-color: var(--ink-soft); color: var(--ink); text-decoration: none; }
.btn-small {
  font-size: 12.5px;
  padding: 7px 14px;
}

/* =========================================================
   Hero (home)
   ========================================================= */
.hero {
  background: var(--ink);
  color: #dde3ee;
  overflow: hidden;
  position: relative;
}
.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  padding-top: 64px;
  padding-bottom: 64px;
}
.hero h1 {
  color: #fff;
  font-size: clamp(32px, 4.4vw, 50px);
  margin: 14px 0 18px;
}
.hero .lede {
  font-size: 17px;
  color: #b9c4da;
  max-width: 46ch;
  margin-bottom: 28px;
}
.hero .issue-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: #9fe3bc;
  text-transform: uppercase;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-graphic { width: 100%; }
.hero-graphic svg { width: 100%; height: auto; }

@media (max-width: 880px) {
  .hero .container { grid-template-columns: 1fr; padding-top: 44px; padding-bottom: 44px; }
  .hero-graphic { order: -1; max-width: 360px; margin: 0 auto; }
}

/* =========================================================
   Stats strip
   ========================================================= */
.stats-strip {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.stats-strip .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.stat {
  padding: 28px 20px;
  text-align: center;
  border-left: 1px solid var(--line);
}
.stat:first-child { border-left: none; }
.stat .value {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 600;
  color: var(--ink);
}
.stat .label {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 4px;
  letter-spacing: 0.02em;
}
@media (max-width: 720px) {
  .stats-strip .container { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: none; }
  .stat:nth-child(odd) { border-left: none; }
  .stat { border-top: 1px solid var(--line); }
  .stat:nth-child(-n+2) { border-top: none; }
}

/* =========================================================
   Section scaffolding
   ========================================================= */
.section {
  padding: 64px 0;
}
.section.tight { padding: 44px 0; }
.section-header {
  margin-bottom: 32px;
  max-width: 64ch;
}
.section-header h2 {
  font-size: 28px;
  margin-top: 8px;
}
.section-header p {
  margin-top: 10px;
  color: var(--text);
}
.section.alt { background: var(--surface); }
.section + .section { border-top: 1px solid var(--line); }

.page-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 40px 0;
}
.page-header h1 { font-size: 32px; margin-top: 8px; }
.page-header p { margin-top: 8px; color: var(--text); max-width: 60ch; }

/* =========================================================
   Citation card — signature element
   ========================================================= */
.citation-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 18px;
}
.citation-card__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.citation-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green);
  background: var(--green-soft);
  padding: 3px 8px;
  border-radius: var(--radius);
}
.citation-card__tag.gold {
  color: var(--gold);
  background: var(--gold-soft);
}
.citation-card__pages {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}
.citation-card__title {
  font-size: 19px;
  margin: 4px 0 6px;
}
.citation-card__title a { color: var(--ink); }
.citation-card__title a:hover { color: var(--green); }
.citation-card__authors {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.citation-card__abstract {
  font-size: 14.5px;
  color: var(--text);
  margin-bottom: 14px;
}
.citation-card__meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-muted);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  word-break: break-all;
  margin-bottom: 14px;
}
.citation-card__actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.copy-btn {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  background: var(--surface);
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 7px 14px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.copy-btn:hover { background: var(--ink); color: #fff; border-color: var(--ink); }
.copy-btn[data-copied="true"] { background: var(--green); color: #fff; border-color: var(--green); }

/* =========================================================
   Call for papers banner
   ========================================================= */
.cfp-banner {
  background: var(--green);
  color: #eaf3ee;
  border-radius: var(--radius);
  padding: 36px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.cfp-banner h3 { color: #fff; font-size: 22px; margin-bottom: 6px; }
.cfp-banner p { margin: 0; color: #cfe6da; max-width: 50ch; }

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: var(--ink);
  color: #aebbd4;
  padding: 56px 0 28px;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-grid h4 {
  color: #fff;
  font-size: 14px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.footer-grid p, .footer-grid li { color: #aebbd4; line-height: 1.7; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid a { color: #cdd6e8; }
.footer-grid a:hover { color: #fff; }
.indexing-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.indexing-list span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  border: 1px solid rgba(255,255,255,0.2);
  padding: 4px 9px;
  border-radius: var(--radius);
  color: #cdd6e8;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 22px;
  font-size: 12.5px;
  color: #8493b3;
}
@media (max-width: 880px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* =========================================================
   Editorial board
   ========================================================= */
.board-group { margin-bottom: 40px; }
.board-group h3 {
  font-size: 20px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.board-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.board-member {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
}
.board-member .name { font-family: var(--font-display); font-size: 16px; color: var(--ink); font-weight: 600; }
.board-member .role { font-family: var(--font-mono); font-size: 11px; color: var(--green); text-transform: uppercase; letter-spacing: 0.06em; margin: 4px 0 8px; }
.board-member .affil { font-size: 13.5px; color: var(--text-muted); }

/* =========================================================
   Process timeline (review workflow — real sequence)
   ========================================================= */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.timeline li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.timeline li:first-child { border-top: none; }
.timeline .step-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--green);
  background: var(--green-soft);
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
}
.timeline h4 { font-size: 16px; margin-bottom: 4px; }
.timeline p { margin: 0; font-size: 14px; }

/* =========================================================
   Generic content lists / cards
   ========================================================= */
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
@media (max-width: 880px) { .info-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .info-grid { grid-template-columns: 1fr; } }

.info-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.info-card h3 { font-size: 17px; margin-bottom: 8px; }
.info-card p { font-size: 14px; margin: 0; }

.prose h2 { font-size: 22px; margin: 32px 0 12px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 17px; margin: 22px 0 8px; }
.prose p { margin: 0 0 14px; }
.prose ul, .prose ol { margin: 0 0 14px; padding-left: 22px; }
.prose li { margin-bottom: 6px; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 14px;
}
.prose th, .prose td {
  border: 1px solid var(--line);
  padding: 9px 12px;
  text-align: left;
}
.prose th {
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
}
.prose code {
  font-family: var(--font-mono);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1px 5px;
  font-size: 13px;
}

/* =========================================================
   Two column layout (e.g. content + sidebar)
   ========================================================= */
.layout-2col {
  display: grid;
  grid-template-columns: 2.1fr 1fr;
  gap: 44px;
  align-items: start;
}
@media (max-width: 880px) { .layout-2col { grid-template-columns: 1fr; } }

.sidebar-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 20px;
}
.sidebar-card h3 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 12px;
}
.sidebar-card ul { margin: 0; padding-left: 18px; font-size: 14px; }
.sidebar-card li { margin-bottom: 8px; }
.sidebar-card .download-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}
.sidebar-card .download-link:last-child { border-bottom: none; }
.sidebar-card .download-link span.ext {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

/* =========================================================
   Forms (Submit manuscript)
   ========================================================= */
.form-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
}
.field { margin-bottom: 20px; }
.field label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 6px;
}
.field .hint {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 4px;
}
.field input,
.field select,
.field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 14.5px;
  padding: 11px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--ink);
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  background: var(--surface);
  border-color: var(--green);
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
@media (max-width: 600px) { .field-row { grid-template-columns: 1fr; } }

.checkbox-field {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 14px;
  color: var(--text);
}
.checkbox-field input { width: auto; margin-top: 3px; }

.form-status {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: var(--radius);
  font-size: 14px;
  display: none;
}
.form-status.show { display: block; }
.form-status.success { background: var(--green-soft); color: var(--green); border: 1px solid var(--green); }

/* =========================================================
   Issue archive accordion
   ========================================================= */
.archive-issue {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  margin-bottom: 14px;
  overflow: hidden;
}
.archive-issue summary {
  cursor: pointer;
  list-style: none;
  padding: 18px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-weight: 600;
  color: var(--ink);
}
.archive-issue summary::-webkit-details-marker { display: none; }
.archive-issue summary .vol {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--green);
  font-weight: 600;
}
.archive-issue summary .arrow {
  font-family: var(--font-mono);
  color: var(--text-muted);
  transition: transform 0.2s ease;
}
.archive-issue[open] summary .arrow { transform: rotate(90deg); }
.archive-issue .archive-body {
  padding: 0 22px 22px;
  border-top: 1px solid var(--line);
}
.archive-issue .archive-body { padding-top: 18px; }
.archive-toc-item {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 14px;
  font-size: 14px;
}
.archive-toc-item:last-child { border-bottom: none; }
.archive-toc-item a { color: var(--ink-soft); font-weight: 600; }
.archive-toc-item a:hover { color: var(--green); }
.archive-toc-item .pages { font-family: var(--font-mono); font-size: 12.5px; color: var(--text-muted); white-space: nowrap; }

/* =========================================================
   Search / filter bar
   ========================================================= */
.search-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.search-bar input[type="search"] {
  flex: 1;
  min-width: 200px;
  font-family: var(--font-body);
  font-size: 14.5px;
  padding: 12px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
}
.search-bar select {
  font-family: var(--font-body);
  font-size: 14.5px;
  padding: 12px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
}
.search-bar input:focus, .search-bar select:focus { border-color: var(--green); }

.no-results {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 14.5px;
  display: none;
}
.no-results.show { display: block; }