/* Substrate Design System — extracted from merged mockup */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500&family=EB+Garamond:ital,wght@0,400;0,600;0,700;1,400&family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,600;1,8..60,400&family=JetBrains+Mono:wght@300;400&display=swap');

:root {
  --bg: #f0f0f4;
  --bg-card: #ffffff;
  --bg-dark: #2d3352;
  --text: #1a1a1a;
  --text-dark: #1a1a3a;
  --text-secondary: #5a5a7a;
  --text-muted: #8888a8;
  --accent: #4a5a8a;
  --accent-hover: #3a4a7a;
  --accent-light: #d4d8ec;
  --border: #d8d8e4;
  --border-light: #e8e8ee;
  --gradient: linear-gradient(135deg, #b8c4e0 0%, #d4d8ec 50%, #c8cce4 100%);
  --serif: 'Source Serif 4', Georgia, serif;
  --display: 'EB Garamond', Georgia, serif;
  --sans: 'DM Sans', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---- PUBLISHER BAR ---- */
.publisher-bar {
  background: var(--bg-dark);
  color: #c8cce4;
  font-family: var(--sans);
  font-size: 12px;
  padding: 6px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.publisher-bar a { color: #c8cce4; text-decoration: none; }
.publisher-bar a:hover { color: #fff; }
.publisher-bar .pub-name { letter-spacing: 0.08em; text-transform: uppercase; font-weight: 500; font-size: 11px; }
.publisher-bar .pub-links { display: flex; gap: 16px; }

/* ---- HEADER / NAV ---- */
header {
  background: var(--gradient);
  border-bottom: 2px solid var(--accent);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-lockup {
  display: flex;
  align-items: center;
  gap: 0;
  text-decoration: none;
  color: var(--text-dark);
}
.logo-lockup:hover { opacity: 0.85; }

nav a {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  color: var(--text-dark);
  text-decoration: none;
  letter-spacing: 0.3px;
  padding: 6px 0;
  position: relative;
  transition: color 0.2s;
}
nav a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s;
}
nav a:hover { color: var(--accent-hover); }
nav a:hover::after { width: 100%; }
nav a.active { color: var(--accent); font-weight: 500; }
nav a.active::after { width: 100%; }
nav { display: flex; gap: 28px; align-items: center; }

/* ---- HERO ---- */
.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 40px 56px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-text h1 {
  font-family: var(--display);
  font-size: 48px;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.3px;
  color: var(--text-dark);
  margin-bottom: 24px;
}
.hero-text h1 em {
  font-style: italic;
  color: var(--accent);
}
.hero-text p {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 480px;
  margin-bottom: 32px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  padding: 12px 0;
  border-bottom: 1px solid var(--accent);
  transition: gap 0.3s;
}
.hero-cta:hover { gap: 14px; }
.hero-cta svg { transition: transform 0.3s; }
.hero-cta:hover svg { transform: translateX(3px); }

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* ---- SECTION LABELS ---- */
.section-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ---- LATEST ISSUE ---- */
.latest-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 40px;
}

.issue-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 40px;
}

.issue-title {
  font-family: var(--display);
  font-size: 28px;
  font-weight: 400;
  color: var(--text-dark);
}

.issue-meta {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.articles-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 32px;
  text-decoration: none;
  color: var(--text);
  display: flex;
  flex-direction: column;
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.2s;
}
.article-card:hover {
  border-left-color: var(--accent-hover);
  box-shadow: 0 4px 20px rgba(74, 90, 138, 0.08);
}

.article-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.article-title {
  font-family: var(--display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 10px;
  color: var(--text-dark);
}
.article-card:hover .article-title { color: var(--accent); }

.article-authors {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.article-abstract {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  flex: 1;
}

.article-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

.article-doi {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.3px;
}

.article-links {
  display: flex;
  gap: 12px;
}
.article-links a {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 2px;
  transition: all 0.2s;
}
.article-links a:hover {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

/* Featured card */
.article-card.featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 32px;
}

/* ---- EDITORIAL STATEMENT ---- */
.editorial {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 40px 80px;
}

.editorial-inner {
  background: var(--bg-dark);
  border-radius: 8px;
  padding: 64px 80px;
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 60px;
  align-items: start;
}

.editorial-heading {
  font-family: var(--display);
  font-size: 32px;
  color: #e8e0f0;
  font-weight: 400;
  line-height: 1.3;
}
.editorial-heading em { font-style: italic; color: #b8c4e0; }

.editorial-body {
  font-family: var(--serif);
  font-size: 15px;
  color: #9898b8;
  line-height: 1.8;
}
.editorial-body p + p { margin-top: 16px; }

/* ---- SUBMIT CTA ---- */
.submit-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px 80px;
}

.submit-inner {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.submit-text h3 {
  font-family: var(--display);
  font-size: 24px;
  font-weight: 400;
  color: var(--text-dark);
  margin-bottom: 8px;
}
.submit-text p {
  font-size: 14px;
  color: var(--text-secondary);
}

.submit-btn {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #fff;
  background: var(--accent);
  border: none;
  padding: 14px 32px;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
  display: inline-block;
}
.submit-btn:hover { background: var(--accent-hover); }

/* ---- FOOTER ---- */
footer {
  background: var(--bg-dark);
  color: #c8cce4;
  padding: 48px 40px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: start;
}

.footer-left p {
  font-size: 13px;
  color: #9898b8;
  margin-top: 12px;
  line-height: 1.6;
}

.footer-right {
  display: flex;
  gap: 48px;
}

.footer-col h4 {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #8888a8;
  margin-bottom: 14px;
}

.footer-col a {
  display: block;
  font-size: 13px;
  color: #9898b8;
  text-decoration: none;
  padding: 3px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: #fff; }

.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(200, 204, 228, 0.15);
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: #8888a8;
}
.footer-bottom a { color: #b8c4e0; text-decoration: none; }
.footer-bottom a:hover { color: #fff; }

/* ---- PAGE CONTENT (subpages) ---- */
.page-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 40px 80px;
}

.page-content h1 {
  font-family: var(--display);
  font-size: 36px;
  font-weight: 400;
  color: var(--text-dark);
  margin-bottom: 32px;
}

.page-content h2 {
  font-family: var(--display);
  font-size: 24px;
  font-weight: 600;
  color: var(--text-dark);
  margin-top: 48px;
  margin-bottom: 16px;
}

.page-content h3 {
  font-family: var(--display);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-dark);
  margin-top: 32px;
  margin-bottom: 12px;
}

.page-content p {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
  max-width: 760px;
}

.page-content ul, .page-content ol {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
  padding-left: 24px;
  max-width: 760px;
}

.page-content li { margin-bottom: 8px; }

.page-content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-light);
  transition: border-color 0.2s;
}
.page-content a:hover { border-color: var(--accent); }

.page-content .content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 40px;
  margin-bottom: 24px;
}

.page-content .info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

.page-content .info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 32px;
}

.page-content .info-card h3 {
  margin-top: 0;
}

/* Breadcrumbs */
.breadcrumbs {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 32px;
}
.breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
}
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs .sep { margin: 0 8px; }

/* ---- PAPER PAGE ---- */
.paper-header {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-light);
}

.paper-header .article-type {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.paper-header h1 {
  font-family: var(--display);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-dark);
  margin-bottom: 16px;
  max-width: none;
}

.paper-header .authors {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.paper-header .affiliations {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.paper-dates {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.date-item {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--text-muted);
}
.date-label {
  font-weight: 500;
  color: var(--text-secondary);
}

.paper-meta-block {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.meta-label {
  font-weight: 500;
  color: var(--text-secondary);
}

.download-links {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.btn-pdf {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: #fff;
  background: var(--accent);
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 4px;
  transition: background 0.2s;
}
.btn-pdf:hover { background: var(--accent-hover); }

.link-secondary {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: all 0.2s;
}
.link-secondary:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* Abstract */
.abstract-section {
  background: var(--bg);
  border-radius: 4px;
  padding: 32px;
  margin-bottom: 40px;
}

.abstract-section h2 {
  font-family: var(--display);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.abstract-section p {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: none;
}

.keywords {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 16px;
}
.keywords strong { color: var(--text-secondary); }

/* Paper body */
.paper-body h2 {
  font-family: var(--display);
  font-size: 22px;
  font-weight: 600;
  color: var(--text-dark);
  margin-top: 40px;
  margin-bottom: 16px;
}

.paper-body h3 {
  font-family: var(--display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-dark);
  margin-top: 28px;
  margin-bottom: 12px;
}

.paper-body p {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--text);
  line-height: 1.85;
  margin-bottom: 16px;
}

.paper-body ul {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--text);
  line-height: 1.85;
  margin-bottom: 16px;
  padding-left: 24px;
}

.paper-body li { margin-bottom: 6px; }

.references p {
  font-size: 14px;
  color: var(--text-secondary);
  padding-left: 24px;
  text-indent: -24px;
  margin-bottom: 8px;
}

/* Citation block */
.citation-block {
  background: var(--bg);
  border-radius: 4px;
  padding: 32px;
  margin-top: 40px;
}

.citation-block h3 {
  font-family: var(--display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 12px;
}

.formatted-citation {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.bibtex-toggle {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  background: none;
  border: 1px solid var(--accent);
  padding: 6px 16px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
.bibtex-toggle:hover {
  background: var(--accent);
  color: #fff;
}

.bibtex-content {
  display: none;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 20px;
  margin-top: 16px;
  white-space: pre-wrap;
  line-height: 1.6;
}
.bibtex-content.visible { display: block; }

/* ---- BOARD MEMBER CARDS ---- */
.board-member {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 32px;
  margin-bottom: 20px;
}

.board-member h3 {
  font-family: var(--display);
  font-size: 22px;
  font-weight: 600;
  color: var(--text-dark);
  margin-top: 0;
  margin-bottom: 4px;
}

.board-member .model-info {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-muted);
}

.board-member .role {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.board-member p {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ---- CONTACT INFO ---- */
.contact-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 24px 32px;
  margin-bottom: 16px;
}

.contact-item h3 {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dark);
  margin-top: 0;
  margin-bottom: 4px;
}

.contact-item a {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  text-decoration: none;
}
.contact-item a:hover { text-decoration: underline; }

.contact-item p {
  font-family: var(--serif);
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding: 50px 24px 40px; }
  .hero-text h1 { font-size: 36px; }
  .articles-grid { grid-template-columns: 1fr; }
  .article-card.featured { grid-template-columns: 1fr; }
  .editorial-inner { grid-template-columns: 1fr; padding: 40px 32px; }
  .nav-inner { padding: 16px 24px; }
  nav { gap: 16px; }
  .footer-inner { flex-direction: column; gap: 32px; }
  .submit-inner { flex-direction: column; gap: 24px; text-align: center; }
  .page-content .info-grid { grid-template-columns: 1fr; }
  .publisher-bar { padding: 6px 24px; }
  .page-content { padding: 40px 24px 60px; }
  .latest-section { padding: 40px 24px; }
  .editorial { padding: 20px 24px 60px; }
  .submit-section { padding: 0 24px 60px; }
  .issue-header { flex-direction: column; gap: 8px; }
  .paper-dates { flex-direction: column; gap: 8px; }
  .paper-meta-block { flex-direction: column; gap: 8px; }
  .download-links { flex-direction: column; align-items: flex-start; }
}